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gnu / gcc / master / . / libphobos / src / std / format / internal / write.d
blob: bb6d878c8395800b0cb34fd141f6e346665ccd90 [file] [log] [blame]
// Written in the D programming language.
/*
Copyright: Copyright The D Language Foundation 2000-2013.
License: $(HTTP boost.org/LICENSE_1_0.txt, Boost License 1.0).
Authors: $(HTTP walterbright.com, Walter Bright), $(HTTP erdani.com,
Andrei Alexandrescu), and Kenji Hara
Source: $(PHOBOSSRC std/format/internal/write.d)
*/
module std.format.internal.write;
import std.format.spec : FormatSpec;
import std.range.primitives : isInputRange;
import std.traits;
version (StdUnittest)
{
import std.exception : assertCTFEable;
import std.format : format;
}
package(std.format):
/*
`bool`s are formatted as `"true"` or `"false"` with `%s` and as `1` or
`0` with integral-specific format specs.
*/
void formatValueImpl(Writer, T, Char)(auto ref Writer w, const(T) obj, scope const ref FormatSpec!Char f)
if (is(BooleanTypeOf!T) && !is(T == enum) && !hasToString!(T, Char))
{
BooleanTypeOf!T val = obj;
if (f.spec == 's')
writeAligned(w, val ? "true" : "false", f);
else
formatValueImpl(w, cast(byte) val, f);
}
@safe pure unittest
{
assertCTFEable!(
{
formatTest(false, "false");
formatTest(true, "true");
});
}
@safe unittest
{
struct S1
{
bool val;
alias val this;
}
struct S2
{
bool val;
alias val this;
string toString() const { return "S"; }
}
formatTest(S1(false), "false");
formatTest(S1(true), "true");
formatTest(S2(false), "S");
formatTest(S2(true), "S");
}
@safe pure unittest
{
string t1 = format("[%6s] [%6s] [%-6s]", true, false, true);
assert(t1 == "[ true] [ false] [true ]");
string t2 = format("[%3s] [%-2s]", true, false);
assert(t2 == "[true] [false]");
}
// https://issues.dlang.org/show_bug.cgi?id=20534
@safe pure unittest
{
assert(format("%r",false) == "\0");
}
@safe pure unittest
{
assert(format("%07s",true) == " true");
}
@safe pure unittest
{
assert(format("%=8s",true) == " true ");
assert(format("%=9s",false) == " false ");
assert(format("%=9s",true) == " true ");
assert(format("%-=9s",true) == " true ");
assert(format("%=10s",false) == " false ");
assert(format("%-=10s",false) == " false ");
}
/*
`null` literal is formatted as `"null"`
*/
void formatValueImpl(Writer, T, Char)(auto ref Writer w, const(T) obj, scope const ref FormatSpec!Char f)
if (is(immutable T == immutable typeof(null)) && !is(T == enum) && !hasToString!(T, Char))
{
import std.format : enforceFmt;
const spec = f.spec;
enforceFmt(spec == 's', "null literal cannot match %" ~ spec);
writeAligned(w, "null", f);
}
@safe pure unittest
{
import std.exception : collectExceptionMsg;
import std.format : FormatException;
import std.range.primitives : back;
assert(collectExceptionMsg!FormatException(format("%p", null)).back == 'p');
assertCTFEable!(
{
formatTest(null, "null");
});
}
@safe pure unittest
{
string t = format("[%6s] [%-6s]", null, null);
assert(t == "[ null] [null ]");
}
/*
Integrals are formatted like $(REF printf, core, stdc, stdio).
*/
void formatValueImpl(Writer, T, Char)(auto ref Writer w, const(T) obj, scope const ref FormatSpec!Char f)
if (is(IntegralTypeOf!T) && !is(T == enum) && !hasToString!(T, Char))
{
alias U = IntegralTypeOf!T;
U val = obj; // Extracting alias this may be impure/system/may-throw
if (f.spec == 'r')
{
// raw write, skip all else and write the thing
auto raw = (ref val) @trusted {
return (cast(const char*) &val)[0 .. val.sizeof];
}(val);
import std.range.primitives : put;
if (needToSwapEndianess(f))
foreach_reverse (c; raw)
put(w, c);
else
foreach (c; raw)
put(w, c);
return;
}
static if (isSigned!U)
{
const negative = val < 0 && f.spec != 'x' && f.spec != 'X' && f.spec != 'b' && f.spec != 'o' && f.spec != 'u';
ulong arg = negative ? -cast(ulong) val : val;
}
else
{
const negative = false;
ulong arg = val;
}
arg &= Unsigned!U.max;
formatValueImplUlong!(Writer, Char)(w, arg, negative, f);
}
// Helper function for `formatValueImpl` that avoids template bloat
private void formatValueImplUlong(Writer, Char)(auto ref Writer w, ulong arg, in bool negative,
scope const ref FormatSpec!Char f)
{
immutable uint base = baseOfSpec(f.spec);
const bool zero = arg == 0;
char[64] digits = void;
size_t pos = digits.length - 1;
do
{
/* `cast(char)` is needed because value range propagation (VRP) cannot
* analyze `base` because it’s computed in a separate function
* (`baseOfSpec`). */
digits[pos--] = cast(char) ('0' + arg % base);
if (base > 10 && digits[pos + 1] > '9')
digits[pos + 1] += ((f.spec == 'x' || f.spec == 'a') ? 'a' : 'A') - '0' - 10;
arg /= base;
} while (arg > 0);
char[3] prefix = void;
size_t left = 2;
size_t right = 2;
// add sign
if (f.spec != 'x' && f.spec != 'X' && f.spec != 'b' && f.spec != 'o' && f.spec != 'u')
{
if (negative)
prefix[right++] = '-';
else if (f.flPlus)
prefix[right++] = '+';
else if (f.flSpace)
prefix[right++] = ' ';
}
// not a floating point like spec
if (f.spec == 'x' || f.spec == 'X' || f.spec == 'b' || f.spec == 'o' || f.spec == 'u'
|| f.spec == 'd' || f.spec == 's')
{
if (f.flHash && (base == 16) && !zero)
{
prefix[--left] = f.spec;
prefix[--left] = '0';
}
if (f.flHash && (base == 8) && !zero
&& (digits.length - (pos + 1) >= f.precision || f.precision == f.UNSPECIFIED))
prefix[--left] = '0';
writeAligned(w, prefix[left .. right], digits[pos + 1 .. $], "", f, true);
return;
}
FormatSpec!Char fs = f;
if (f.precision == f.UNSPECIFIED)
fs.precision = cast(typeof(fs.precision)) (digits.length - pos - 2);
// %f like output
if (f.spec == 'f' || f.spec == 'F'
|| ((f.spec == 'g' || f.spec == 'G') && (fs.precision >= digits.length - pos - 2)))
{
if (f.precision == f.UNSPECIFIED)
fs.precision = 0;
writeAligned(w, prefix[left .. right], digits[pos + 1 .. $], ".", "", fs,
(f.spec == 'g' || f.spec == 'G') ? PrecisionType.allDigits : PrecisionType.fractionalDigits);
return;
}
import std.algorithm.searching : all;
// at least one digit for %g
if ((f.spec == 'g' || f.spec == 'G') && fs.precision == 0)
fs.precision = 1;
// rounding
size_t digit_end = pos + fs.precision + ((f.spec == 'g' || f.spec == 'G') ? 1 : 2);
if (digit_end <= digits.length)
{
RoundingClass rt = RoundingClass.ZERO;
if (digit_end < digits.length)
{
auto tie = (f.spec == 'a' || f.spec == 'A') ? '8' : '5';
if (digits[digit_end] >= tie)
{
rt = RoundingClass.UPPER;
if (digits[digit_end] == tie && digits[digit_end + 1 .. $].all!(a => a == '0'))
rt = RoundingClass.FIVE;
}
else
{
rt = RoundingClass.LOWER;
if (digits[digit_end .. $].all!(a => a == '0'))
rt = RoundingClass.ZERO;
}
}
if (round(digits, pos + 1, digit_end, rt, negative,
f.spec == 'a' ? 'f' : (f.spec == 'A' ? 'F' : '9')))
{
pos--;
digit_end--;
}
}
// convert to scientific notation
char[1] int_digit = void;
int_digit[0] = digits[pos + 1];
digits[pos + 1] = '.';
char[4] suffix = void;
if (f.spec == 'e' || f.spec == 'E' || f.spec == 'g' || f.spec == 'G')
{
suffix[0] = (f.spec == 'e' || f.spec == 'g') ? 'e' : 'E';
suffix[1] = '+';
suffix[2] = cast(char) ('0' + (digits.length - pos - 2) / 10);
suffix[3] = cast(char) ('0' + (digits.length - pos - 2) % 10);
}
else
{
if (right == 3)
prefix[0] = prefix[2];
prefix[1] = '0';
prefix[2] = f.spec == 'a' ? 'x' : 'X';
left = right == 3 ? 0 : 1;
right = 3;
suffix[0] = f.spec == 'a' ? 'p' : 'P';
suffix[1] = '+';
suffix[2] = cast(char) ('0' + ((digits.length - pos - 2) * 4) / 10);
suffix[3] = cast(char) ('0' + ((digits.length - pos - 2) * 4) % 10);
}
import std.algorithm.comparison : min;
// remove trailing zeros
if ((f.spec == 'g' || f.spec == 'G') && !f.flHash)
{
digit_end = min(digit_end, digits.length);
while (digit_end > pos + 1 &&
(digits[digit_end - 1] == '0' || digits[digit_end - 1] == '.'))
digit_end--;
}
writeAligned(w, prefix[left .. right], int_digit[0 .. $],
digits[pos + 1 .. min(digit_end, $)],
suffix[0 .. $], fs,
(f.spec == 'g' || f.spec == 'G') ? PrecisionType.allDigits : PrecisionType.fractionalDigits);
}
private uint baseOfSpec(in char spec) @safe pure
{
typeof(return) base =
spec == 'x' || spec == 'X' || spec == 'a' || spec == 'A' ? 16 :
spec == 'o' ? 8 :
spec == 'b' ? 2 :
spec == 's' || spec == 'd' || spec == 'u'
|| spec == 'e' || spec == 'E' || spec == 'f' || spec == 'F'
|| spec == 'g' || spec == 'G' ? 10 :
0;
import std.format : enforceFmt;
enforceFmt(base > 0,
"incompatible format character for integral argument: %" ~ spec);
return base;
}
@safe pure unittest
{
assertCTFEable!(
{
formatTest(byte.min, "-128");
formatTest(byte.max, "127");
formatTest(short.min, "-32768");
formatTest(short.max, "32767");
formatTest(int.min, "-2147483648");
formatTest(int.max, "2147483647");
formatTest(long.min, "-9223372036854775808");
formatTest(long.max, "9223372036854775807");
formatTest(ubyte.min, "0");
formatTest(ubyte.max, "255");
formatTest(ushort.min, "0");
formatTest(ushort.max, "65535");
formatTest(uint.min, "0");
formatTest(uint.max, "4294967295");
formatTest(ulong.min, "0");
formatTest(ulong.max, "18446744073709551615");
});
}
// https://issues.dlang.org/show_bug.cgi?id=18838
@safe pure unittest
{
assert("%12,d".format(0) == " 0");
}
@safe pure unittest
{
import std.exception : collectExceptionMsg;
import std.format : FormatException;
import std.range.primitives : back;
assert(collectExceptionMsg!FormatException(format("%c", 5)).back == 'c');
assertCTFEable!(
{
formatTest(9, "9");
formatTest(10, "10");
});
}
@safe unittest
{
struct S1
{
long val;
alias val this;
}
struct S2
{
long val;
alias val this;
string toString() const { return "S"; }
}
formatTest(S1(10), "10");
formatTest(S2(10), "S");
}
// https://issues.dlang.org/show_bug.cgi?id=20064
@safe unittest
{
assert(format( "%03,d", 1234) == "1,234");
assert(format( "%04,d", 1234) == "1,234");
assert(format( "%05,d", 1234) == "1,234");
assert(format( "%06,d", 1234) == "01,234");
assert(format( "%07,d", 1234) == "001,234");
assert(format( "%08,d", 1234) == "0,001,234");
assert(format( "%09,d", 1234) == "0,001,234");
assert(format("%010,d", 1234) == "00,001,234");
assert(format("%011,d", 1234) == "000,001,234");
assert(format("%012,d", 1234) == "0,000,001,234");
assert(format("%013,d", 1234) == "0,000,001,234");
assert(format("%014,d", 1234) == "00,000,001,234");
assert(format("%015,d", 1234) == "000,000,001,234");
assert(format("%016,d", 1234) == "0,000,000,001,234");
assert(format("%017,d", 1234) == "0,000,000,001,234");
assert(format( "%03,d", -1234) == "-1,234");
assert(format( "%04,d", -1234) == "-1,234");
assert(format( "%05,d", -1234) == "-1,234");
assert(format( "%06,d", -1234) == "-1,234");
assert(format( "%07,d", -1234) == "-01,234");
assert(format( "%08,d", -1234) == "-001,234");
assert(format( "%09,d", -1234) == "-0,001,234");
assert(format("%010,d", -1234) == "-0,001,234");
assert(format("%011,d", -1234) == "-00,001,234");
assert(format("%012,d", -1234) == "-000,001,234");
assert(format("%013,d", -1234) == "-0,000,001,234");
assert(format("%014,d", -1234) == "-0,000,001,234");
assert(format("%015,d", -1234) == "-00,000,001,234");
assert(format("%016,d", -1234) == "-000,000,001,234");
assert(format("%017,d", -1234) == "-0,000,000,001,234");
}
@safe pure unittest
{
string t1 = format("[%6s] [%-6s]", 123, 123);
assert(t1 == "[ 123] [123 ]");
string t2 = format("[%6s] [%-6s]", -123, -123);
assert(t2 == "[ -123] [-123 ]");
}
@safe pure unittest
{
formatTest(byte.min, "-128");
formatTest(short.min, "-32768");
formatTest(int.min, "-2147483648");
formatTest(long.min, "-9223372036854775808");
}
// https://issues.dlang.org/show_bug.cgi?id=21777
@safe pure unittest
{
assert(format!"%20.5,d"(cast(short) 120) == " 00,120");
assert(format!"%20.5,o"(cast(short) 120) == " 00,170");
assert(format!"%20.5,x"(cast(short) 120) == " 00,078");
assert(format!"%20.5,2d"(cast(short) 120) == " 0,01,20");
assert(format!"%20.5,2o"(cast(short) 120) == " 0,01,70");
assert(format!"%20.5,4d"(cast(short) 120) == " 0,0120");
assert(format!"%20.5,4o"(cast(short) 120) == " 0,0170");
assert(format!"%20.5,4x"(cast(short) 120) == " 0,0078");
assert(format!"%20.5,2x"(3000) == " 0,0b,b8");
assert(format!"%20.5,4d"(3000) == " 0,3000");
assert(format!"%20.5,4o"(3000) == " 0,5670");
assert(format!"%20.5,4x"(3000) == " 0,0bb8");
assert(format!"%20.5,d"(-400) == " -00,400");
assert(format!"%20.30d"(-400) == "-000000000000000000000000000400");
assert(format!"%20.5,4d"(0) == " 0,0000");
assert(format!"%0#.8,2s"(12345) == "00,01,23,45");
assert(format!"%0#.9,3x"(55) == "0x000,000,037");
}
// https://issues.dlang.org/show_bug.cgi?id=21814
@safe pure unittest
{
assert(format("%,0d",1000) == "1000");
}
// https://issues.dlang.org/show_bug.cgi?id=21817
@safe pure unittest
{
assert(format!"%u"(-5) == "4294967291");
}
// https://issues.dlang.org/show_bug.cgi?id=21820
@safe pure unittest
{
assert(format!"%#.0o"(0) == "0");
}
@safe pure unittest
{
assert(format!"%e"(10000) == "1.0000e+04");
assert(format!"%.2e"(10000) == "1.00e+04");
assert(format!"%.10e"(10000) == "1.0000000000e+04");
assert(format!"%e"(9999) == "9.999e+03");
assert(format!"%.2e"(9999) == "1.00e+04");
assert(format!"%.10e"(9999) == "9.9990000000e+03");
assert(format!"%f"(10000) == "10000");
assert(format!"%.2f"(10000) == "10000.00");
assert(format!"%g"(10000) == "10000");
assert(format!"%.2g"(10000) == "1e+04");
assert(format!"%.10g"(10000) == "10000");
assert(format!"%#g"(10000) == "10000.");
assert(format!"%#.2g"(10000) == "1.0e+04");
assert(format!"%#.10g"(10000) == "10000.00000");
assert(format!"%g"(9999) == "9999");
assert(format!"%.2g"(9999) == "1e+04");
assert(format!"%.10g"(9999) == "9999");
assert(format!"%a"(0x10000) == "0x1.0000p+16");
assert(format!"%.2a"(0x10000) == "0x1.00p+16");
assert(format!"%.10a"(0x10000) == "0x1.0000000000p+16");
assert(format!"%a"(0xffff) == "0xf.fffp+12");
assert(format!"%.2a"(0xffff) == "0x1.00p+16");
assert(format!"%.10a"(0xffff) == "0xf.fff0000000p+12");
}
@safe pure unittest
{
assert(format!"%.3e"(ulong.max) == "1.845e+19");
assert(format!"%.3f"(ulong.max) == "18446744073709551615.000");
assert(format!"%.3g"(ulong.max) == "1.84e+19");
assert(format!"%.3a"(ulong.max) == "0x1.000p+64");
assert(format!"%.3e"(long.min) == "-9.223e+18");
assert(format!"%.3f"(long.min) == "-9223372036854775808.000");
assert(format!"%.3g"(long.min) == "-9.22e+18");
assert(format!"%.3a"(long.min) == "-0x8.000p+60");
assert(format!"%e"(0) == "0e+00");
assert(format!"%f"(0) == "0");
assert(format!"%g"(0) == "0");
assert(format!"%a"(0) == "0x0p+00");
}
@safe pure unittest
{
assert(format!"%.0g"(1500) == "2e+03");
}
// https://issues.dlang.org/show_bug.cgi?id=21900#
@safe pure unittest
{
assert(format!"%.1a"(472) == "0x1.ep+08");
}
/*
Floating-point values are formatted like $(REF printf, core, stdc, stdio)
*/
void formatValueImpl(Writer, T, Char)(auto ref Writer w, const(T) obj,
scope const ref FormatSpec!Char f)
if (is(FloatingPointTypeOf!T) && !is(T == enum) && !hasToString!(T, Char))
{
import std.format : enforceFmt;
import std.range.primitives : put;
import std.format.internal.floats : printFloat, isFloatSpec;
FloatingPointTypeOf!T val = obj;
const char spec = f.spec;
if (spec == 'r')
{
// raw write, skip all else and write the thing
auto raw = (ref val) @trusted {
return (cast(const char*) &val)[0 .. val.sizeof];
}(val);
if (needToSwapEndianess(f))
{
foreach_reverse (c; raw)
put(w, c);
}
else
{
foreach (c; raw)
put(w, c);
}
return;
}
FormatSpec!Char fs = f; // fs is copy for change its values.
fs.spec = spec == 's' ? 'g' : spec;
enforceFmt(isFloatSpec(fs.spec), "incompatible format character for floating point argument: %" ~ spec);
static if (is(T == float) || is(T == double)
|| (is(T == real) && (T.mant_dig == double.mant_dig || T.mant_dig == 64)))
{
alias tval = val;
}
else
{
import std.math.traits : isInfinity;
import std.math.operations : nextUp;
// reals that are not supported by printFloat are cast to double.
double tval = val;
// Numbers greater than double.max are converted to double.max:
if (val > double.max && !isInfinity(val))
tval = double.max;
if (val < -double.max && !isInfinity(val))
tval = -double.max;
// Numbers between the smallest representable double subnormal and 0.0
// are converted to the smallest representable double subnormal:
enum doubleLowest = nextUp(0.0);
if (val > 0 && val < doubleLowest)
tval = doubleLowest;
if (val < 0 && val > -doubleLowest)
tval = -doubleLowest;
}
printFloat(w, tval, fs);
}
@safe unittest
{
assert(format("%.1f", 1337.7) == "1337.7");
assert(format("%,3.2f", 1331.982) == "1,331.98");
assert(format("%,3.0f", 1303.1982) == "1,303");
assert(format("%#,3.4f", 1303.1982) == "1,303.1982");
assert(format("%#,3.0f", 1303.1982) == "1,303.");
}
@safe pure unittest
{
import std.conv : to;
import std.exception : collectExceptionMsg;
import std.format : FormatException;
import std.meta : AliasSeq;
import std.range.primitives : back;
assert(collectExceptionMsg!FormatException(format("%d", 5.1)).back == 'd');
static foreach (T; AliasSeq!(float, double, real))
{
formatTest(to!( T)(5.5), "5.5");
formatTest(to!( const T)(5.5), "5.5");
formatTest(to!(immutable T)(5.5), "5.5");
formatTest(T.nan, "nan");
}
}
@safe unittest
{
formatTest(2.25, "2.25");
struct S1
{
double val;
alias val this;
}
struct S2
{
double val;
alias val this;
string toString() const { return "S"; }
}
formatTest(S1(2.25), "2.25");
formatTest(S2(2.25), "S");
}
// https://issues.dlang.org/show_bug.cgi?id=19939
@safe unittest
{
assert(format("^%13,3.2f$", 1.00) == "^ 1.00$");
assert(format("^%13,3.2f$", 10.00) == "^ 10.00$");
assert(format("^%13,3.2f$", 100.00) == "^ 100.00$");
assert(format("^%13,3.2f$", 1_000.00) == "^ 1,000.00$");
assert(format("^%13,3.2f$", 10_000.00) == "^ 10,000.00$");
assert(format("^%13,3.2f$", 100_000.00) == "^ 100,000.00$");
assert(format("^%13,3.2f$", 1_000_000.00) == "^ 1,000,000.00$");
assert(format("^%13,3.2f$", 10_000_000.00) == "^10,000,000.00$");
}
// https://issues.dlang.org/show_bug.cgi?id=20069
@safe unittest
{
assert(format("%012,f", -1234.0) == "-1,234.000000");
assert(format("%013,f", -1234.0) == "-1,234.000000");
assert(format("%014,f", -1234.0) == "-01,234.000000");
assert(format("%011,f", 1234.0) == "1,234.000000");
assert(format("%012,f", 1234.0) == "1,234.000000");
assert(format("%013,f", 1234.0) == "01,234.000000");
assert(format("%014,f", 1234.0) == "001,234.000000");
assert(format("%015,f", 1234.0) == "0,001,234.000000");
assert(format("%016,f", 1234.0) == "0,001,234.000000");
assert(format( "%08,.2f", -1234.0) == "-1,234.00");
assert(format( "%09,.2f", -1234.0) == "-1,234.00");
assert(format("%010,.2f", -1234.0) == "-01,234.00");
assert(format("%011,.2f", -1234.0) == "-001,234.00");
assert(format("%012,.2f", -1234.0) == "-0,001,234.00");
assert(format("%013,.2f", -1234.0) == "-0,001,234.00");
assert(format("%014,.2f", -1234.0) == "-00,001,234.00");
assert(format( "%08,.2f", 1234.0) == "1,234.00");
assert(format( "%09,.2f", 1234.0) == "01,234.00");
assert(format("%010,.2f", 1234.0) == "001,234.00");
assert(format("%011,.2f", 1234.0) == "0,001,234.00");
assert(format("%012,.2f", 1234.0) == "0,001,234.00");
assert(format("%013,.2f", 1234.0) == "00,001,234.00");
assert(format("%014,.2f", 1234.0) == "000,001,234.00");
assert(format("%015,.2f", 1234.0) == "0,000,001,234.00");
assert(format("%016,.2f", 1234.0) == "0,000,001,234.00");
}
@safe unittest
{
import std.math.hardware; // cannot be selective, because FloatingPointControl might not be defined
// std.math's FloatingPointControl isn't available on all target platforms
static if (is(FloatingPointControl))
{
assert(FloatingPointControl.rounding == FloatingPointControl.roundToNearest);
}
// https://issues.dlang.org/show_bug.cgi?id=20320
real a = 0.16;
real b = 0.016;
assert(format("%.1f", a) == "0.2");
assert(format("%.2f", b) == "0.02");
double a1 = 0.16;
double b1 = 0.016;
assert(format("%.1f", a1) == "0.2");
assert(format("%.2f", b1) == "0.02");
// https://issues.dlang.org/show_bug.cgi?id=9889
assert(format("%.1f", 0.09) == "0.1");
assert(format("%.1f", -0.09) == "-0.1");
assert(format("%.1f", 0.095) == "0.1");
assert(format("%.1f", -0.095) == "-0.1");
assert(format("%.1f", 0.094) == "0.1");
assert(format("%.1f", -0.094) == "-0.1");
}
@safe unittest
{
double a = 123.456;
double b = -123.456;
double c = 123.0;
assert(format("%10.4f",a) == " 123.4560");
assert(format("%-10.4f",a) == "123.4560 ");
assert(format("%+10.4f",a) == " +123.4560");
assert(format("% 10.4f",a) == " 123.4560");
assert(format("%010.4f",a) == "00123.4560");
assert(format("%#10.4f",a) == " 123.4560");
assert(format("%10.4f",b) == " -123.4560");
assert(format("%-10.4f",b) == "-123.4560 ");
assert(format("%+10.4f",b) == " -123.4560");
assert(format("% 10.4f",b) == " -123.4560");
assert(format("%010.4f",b) == "-0123.4560");
assert(format("%#10.4f",b) == " -123.4560");
assert(format("%10.0f",c) == " 123");
assert(format("%-10.0f",c) == "123 ");
assert(format("%+10.0f",c) == " +123");
assert(format("% 10.0f",c) == " 123");
assert(format("%010.0f",c) == "0000000123");
assert(format("%#10.0f",c) == " 123.");
assert(format("%+010.4f",a) == "+0123.4560");
assert(format("% 010.4f",a) == " 0123.4560");
assert(format("% +010.4f",a) == "+0123.4560");
}
@safe unittest
{
string t1 = format("[%6s] [%-6s]", 12.3, 12.3);
assert(t1 == "[ 12.3] [12.3 ]");
string t2 = format("[%6s] [%-6s]", -12.3, -12.3);
assert(t2 == "[ -12.3] [-12.3 ]");
}
// https://issues.dlang.org/show_bug.cgi?id=20396
@safe unittest
{
import std.math.operations : nextUp;
assert(format!"%a"(nextUp(0.0f)) == "0x0.000002p-126");
assert(format!"%a"(nextUp(0.0)) == "0x0.0000000000001p-1022");
}
// https://issues.dlang.org/show_bug.cgi?id=20371
@safe unittest
{
assert(format!"%.1000a"(1.0).length == 1007);
assert(format!"%.600f"(0.1).length == 602);
assert(format!"%.600e"(0.1L).length == 606);
}
@safe unittest
{
import std.math.hardware; // cannot be selective, because FloatingPointControl might not be defined
// std.math's FloatingPointControl isn't available on all target platforms
static if (is(FloatingPointControl))
{
FloatingPointControl fpctrl;
fpctrl.rounding = FloatingPointControl.roundUp;
assert(format!"%.0e"(3.5) == "4e+00");
assert(format!"%.0e"(4.5) == "5e+00");
assert(format!"%.0e"(-3.5) == "-3e+00");
assert(format!"%.0e"(-4.5) == "-4e+00");
fpctrl.rounding = FloatingPointControl.roundDown;
assert(format!"%.0e"(3.5) == "3e+00");
assert(format!"%.0e"(4.5) == "4e+00");
assert(format!"%.0e"(-3.5) == "-4e+00");
assert(format!"%.0e"(-4.5) == "-5e+00");
fpctrl.rounding = FloatingPointControl.roundToZero;
assert(format!"%.0e"(3.5) == "3e+00");
assert(format!"%.0e"(4.5) == "4e+00");
assert(format!"%.0e"(-3.5) == "-3e+00");
assert(format!"%.0e"(-4.5) == "-4e+00");
fpctrl.rounding = FloatingPointControl.roundToNearest;
assert(format!"%.0e"(3.5) == "4e+00");
assert(format!"%.0e"(4.5) == "4e+00");
assert(format!"%.0e"(-3.5) == "-4e+00");
assert(format!"%.0e"(-4.5) == "-4e+00");
}
}
@safe pure unittest
{
static assert(format("%e",1.0) == "1.000000e+00");
static assert(format("%e",-1.234e156) == "-1.234000e+156");
static assert(format("%a",1.0) == "0x1p+0");
static assert(format("%a",-1.234e156) == "-0x1.7024c96ca3ce4p+518");
static assert(format("%f",1.0) == "1.000000");
static assert(format("%f",-1.234e156) ==
"-123399999999999990477495546305353609103201879173427886566531" ~
"0740685826234179310516880117527217443004051984432279880308552" ~
"009640198043032289366552939010719744.000000");
static assert(format("%g",1.0) == "1");
static assert(format("%g",-1.234e156) == "-1.234e+156");
static assert(format("%e",1.0f) == "1.000000e+00");
static assert(format("%e",-1.234e23f) == "-1.234000e+23");
static assert(format("%a",1.0f) == "0x1p+0");
static assert(format("%a",-1.234e23f) == "-0x1.a2187p+76");
static assert(format("%f",1.0f) == "1.000000");
static assert(format("%f",-1.234e23f) == "-123399998884238311030784.000000");
static assert(format("%g",1.0f) == "1");
static assert(format("%g",-1.234e23f) == "-1.234e+23");
}
// https://issues.dlang.org/show_bug.cgi?id=21641
@safe unittest
{
float a = -999999.8125;
assert(format("%#.5g",a) == "-1.0000e+06");
assert(format("%#.6g",a) == "-1.00000e+06");
}
// https://issues.dlang.org/show_bug.cgi?id=8424
@safe pure unittest
{
static assert(format("%s", 0.6f) == "0.6");
static assert(format("%s", 0.6) == "0.6");
static assert(format("%s", 0.6L) == "0.6");
}
// https://issues.dlang.org/show_bug.cgi?id=9297
@safe pure unittest
{
static if (real.mant_dig == 64) // 80 bit reals
{
assert(format("%.25f", 1.6180339887_4989484820_4586834365L) == "1.6180339887498948482072100");
}
}
// https://issues.dlang.org/show_bug.cgi?id=21853
@safe pure unittest
{
import std.math.exponential : log2;
static if (real.mant_dig == 64) // 80 bit reals
{
// log2 is broken for x87-reals on some computers in CTFE
// the following test excludes these computers from the test
// (https://issues.dlang.org/show_bug.cgi?id=21757)
enum test = cast(int) log2(3.05e2312L);
static if (test == 7681)
static assert(format!"%e"(real.max) == "1.189731e+4932");
}
}
// https://issues.dlang.org/show_bug.cgi?id=21842
@safe pure unittest
{
assert(format!"%-+05,g"(1.0) == "+1 ");
}
// https://issues.dlang.org/show_bug.cgi?id=20536
@safe pure unittest
{
real r = .00000095367431640625L;
assert(format("%a", r) == "0x1p-20");
}
// https://issues.dlang.org/show_bug.cgi?id=21840
@safe pure unittest
{
assert(format!"% 0,e"(0.0) == " 0.000000e+00");
}
// https://issues.dlang.org/show_bug.cgi?id=21841
@safe pure unittest
{
assert(format!"%0.0,e"(0.0) == "0e+00");
}
// https://issues.dlang.org/show_bug.cgi?id=21836
@safe pure unittest
{
assert(format!"%-5,1g"(0.0) == "0 ");
}
// https://issues.dlang.org/show_bug.cgi?id=21838
@safe pure unittest
{
assert(format!"%#,a"(0.0) == "0x0.p+0");
}
/*
Formatting a `creal` is deprecated but still kept around for a while.
*/
deprecated("Use of complex types is deprecated. Use std.complex")
void formatValueImpl(Writer, T, Char)(auto ref Writer w, const(T) obj, scope const ref FormatSpec!Char f)
if (is(immutable T : immutable creal) && !is(T == enum) && !hasToString!(T, Char))
{
import std.range.primitives : put;
immutable creal val = obj;
formatValueImpl(w, val.re, f);
if (val.im >= 0)
{
put(w, '+');
}
formatValueImpl(w, val.im, f);
put(w, 'i');
}
/*
Formatting an `ireal` is deprecated but still kept around for a while.
*/
deprecated("Use of imaginary types is deprecated. Use std.complex")
void formatValueImpl(Writer, T, Char)(auto ref Writer w, const(T) obj, scope const ref FormatSpec!Char f)
if (is(immutable T : immutable ireal) && !is(T == enum) && !hasToString!(T, Char))
{
import std.range.primitives : put;
immutable ireal val = obj;
formatValueImpl(w, val.im, f);
put(w, 'i');
}
/*
Individual characters are formatted as Unicode characters with `%s`
and as integers with integral-specific format specs
*/
void formatValueImpl(Writer, T, Char)(auto ref Writer w, const(T) obj, scope const ref FormatSpec!Char f)
if (is(CharTypeOf!T) && !is(T == enum) && !hasToString!(T, Char))
{
import std.meta : AliasSeq;
CharTypeOf!T[1] val = obj;
if (f.spec == 's' || f.spec == 'c')
writeAligned(w, val[], f);
else
{
alias U = AliasSeq!(ubyte, ushort, uint)[CharTypeOf!T.sizeof/2];
formatValueImpl(w, cast(U) val[0], f);
}
}
@safe pure unittest
{
assertCTFEable!(
{
formatTest('c', "c");
});
}
@safe unittest
{
struct S1
{
char val;
alias val this;
}
struct S2
{
char val;
alias val this;
string toString() const { return "S"; }
}
formatTest(S1('c'), "c");
formatTest(S2('c'), "S");
}
@safe unittest
{
//Little Endian
formatTest("%-r", cast( char)'c', ['c' ]);
formatTest("%-r", cast(wchar)'c', ['c', 0 ]);
formatTest("%-r", cast(dchar)'c', ['c', 0, 0, 0]);
formatTest("%-r", '本', ['\x2c', '\x67'] );
//Big Endian
formatTest("%+r", cast( char)'c', [ 'c']);
formatTest("%+r", cast(wchar)'c', [0, 'c']);
formatTest("%+r", cast(dchar)'c', [0, 0, 0, 'c']);
formatTest("%+r", '本', ['\x67', '\x2c']);
}
@safe pure unittest
{
string t1 = format("[%6s] [%-6s]", 'A', 'A');
assert(t1 == "[ A] [A ]");
string t2 = format("[%6s] [%-6s]", '本', '本');
assert(t2 == "[ 本] [本 ]");
}
/*
Strings are formatted like $(REF printf, core, stdc, stdio)
*/
void formatValueImpl(Writer, T, Char)(auto ref Writer w, scope const(T) obj,
scope const ref FormatSpec!Char f)
if (is(StringTypeOf!T) && !is(StaticArrayTypeOf!T) && !is(T == enum) && !hasToString!(T, Char))
{
Unqual!(const(StringTypeOf!T)) val = obj; // for `alias this`, see bug5371
formatRange(w, val, f);
}
@safe unittest
{
formatTest("abc", "abc");
}
@safe pure unittest
{
import std.exception : collectExceptionMsg;
import std.range.primitives : back;
assert(collectExceptionMsg(format("%d", "hi")).back == 'd');
}
@safe unittest
{
// Test for bug 5371 for structs
struct S1
{
const string var;
alias var this;
}
struct S2
{
string var;
alias var this;
}
formatTest(S1("s1"), "s1");
formatTest(S2("s2"), "s2");
}
@safe unittest
{
struct S3
{
string val; alias val this;
string toString() const { return "S"; }
}
formatTest(S3("s3"), "S");
}
@safe pure unittest
{
//Little Endian
formatTest("%-r", "ab"c, ['a' , 'b' ]);
formatTest("%-r", "ab"w, ['a', 0 , 'b', 0 ]);
formatTest("%-r", "ab"d, ['a', 0, 0, 0, 'b', 0, 0, 0]);
formatTest("%-r", "日本語"c, ['\xe6', '\x97', '\xa5', '\xe6', '\x9c', '\xac',
'\xe8', '\xaa', '\x9e']);
formatTest("%-r", "日本語"w, ['\xe5', '\x65', '\x2c', '\x67', '\x9e', '\x8a']);
formatTest("%-r", "日本語"d, ['\xe5', '\x65', '\x00', '\x00', '\x2c', '\x67',
'\x00', '\x00', '\x9e', '\x8a', '\x00', '\x00']);
//Big Endian
formatTest("%+r", "ab"c, [ 'a', 'b']);
formatTest("%+r", "ab"w, [ 0, 'a', 0, 'b']);
formatTest("%+r", "ab"d, [0, 0, 0, 'a', 0, 0, 0, 'b']);
formatTest("%+r", "日本語"c, ['\xe6', '\x97', '\xa5', '\xe6', '\x9c', '\xac',
'\xe8', '\xaa', '\x9e']);
formatTest("%+r", "日本語"w, ['\x65', '\xe5', '\x67', '\x2c', '\x8a', '\x9e']);
formatTest("%+r", "日本語"d, ['\x00', '\x00', '\x65', '\xe5', '\x00', '\x00',
'\x67', '\x2c', '\x00', '\x00', '\x8a', '\x9e']);
}
@safe pure unittest
{
string t1 = format("[%6s] [%-6s]", "AB", "AB");
assert(t1 == "[ AB] [AB ]");
string t2 = format("[%6s] [%-6s]", "本Ä", "本Ä");
assert(t2 == "[ 本Ä] [本Ä ]");
}
// https://issues.dlang.org/show_bug.cgi?id=6640
@safe unittest
{
import std.range.primitives : front, popFront;
struct Range
{
@safe:
string value;
@property bool empty() const { return !value.length; }
@property dchar front() const { return value.front; }
void popFront() { value.popFront(); }
@property size_t length() const { return value.length; }
}
immutable table =
[
["[%s]", "[string]"],
["[%10s]", "[ string]"],
["[%-10s]", "[string ]"],
["[%(%02x %)]", "[73 74 72 69 6e 67]"],
["[%(%c %)]", "[s t r i n g]"],
];
foreach (e; table)
{
formatTest(e[0], "string", e[1]);
formatTest(e[0], Range("string"), e[1]);
}
}
@safe unittest
{
import std.meta : AliasSeq;
// string literal from valid UTF sequence is encoding free.
static foreach (StrType; AliasSeq!(string, wstring, dstring))
{
// Valid and printable (ASCII)
formatTest([cast(StrType)"hello"],
`["hello"]`);
// 1 character escape sequences (' is not escaped in strings)
formatTest([cast(StrType)"\"'\0\\\a\b\f\n\r\t\v"],
`["\"'\0\\\a\b\f\n\r\t\v"]`);
// 1 character optional escape sequences
formatTest([cast(StrType)"\'\?"],
`["'?"]`);
// Valid and non-printable code point (<= U+FF)
formatTest([cast(StrType)"\x10\x1F\x20test"],
`["\x10\x1F test"]`);
// Valid and non-printable code point (<= U+FFFF)
formatTest([cast(StrType)"\u200B..\u200F"],
`["\u200B..\u200F"]`);
// Valid and non-printable code point (<= U+10FFFF)
formatTest([cast(StrType)"\U000E0020..\U000E007F"],
`["\U000E0020..\U000E007F"]`);
}
// invalid UTF sequence needs hex-string literal postfix (c/w/d)
() @trusted
{
// U+FFFF with UTF-8 (Invalid code point for interchange)
formatTest([cast(string)[0xEF, 0xBF, 0xBF]],
`[[cast(char) 0xEF, cast(char) 0xBF, cast(char) 0xBF]]`);
// U+FFFF with UTF-16 (Invalid code point for interchange)
formatTest([cast(wstring)[0xFFFF]],
`[[cast(wchar) 0xFFFF]]`);
// U+FFFF with UTF-32 (Invalid code point for interchange)
formatTest([cast(dstring)[0xFFFF]],
`[[cast(dchar) 0xFFFF]]`);
} ();
}
/*
Static-size arrays are formatted as dynamic arrays.
*/
void formatValueImpl(Writer, T, Char)(auto ref Writer w, auto ref T obj,
scope const ref FormatSpec!Char f)
if (is(StaticArrayTypeOf!T) && !is(T == enum) && !hasToString!(T, Char))
{
formatValueImpl(w, obj[], f);
}
// Test for https://issues.dlang.org/show_bug.cgi?id=8310
@safe unittest
{
import std.array : appender;
import std.format : formatValue;
FormatSpec!char f;
auto w = appender!string();
char[2] two = ['a', 'b'];
formatValue(w, two, f);
char[2] getTwo() { return two; }
formatValue(w, getTwo(), f);
}
// https://issues.dlang.org/show_bug.cgi?id=18205
@safe pure unittest
{
assert("|%8s|".format("abc") == "| abc|");
assert("|%8s|".format("αβγ") == "| αβγ|");
assert("|%8s|".format(" ") == "| |");
assert("|%8s|".format("été"d) == "| été|");
assert("|%8s|".format("été 2018"w) == "|été 2018|");
assert("%2s".format("e\u0301"w) == " e\u0301");
assert("%2s".format("a\u0310\u0337"d) == " a\u0310\u0337");
}
/*
Dynamic arrays are formatted as input ranges.
*/
void formatValueImpl(Writer, T, Char)(auto ref Writer w, T obj, scope const ref FormatSpec!Char f)
if (is(DynamicArrayTypeOf!T) && !is(StringTypeOf!T) && !is(T == enum) && !hasToString!(T, Char))
{
static if (is(immutable(ArrayTypeOf!T) == immutable(void[])))
{
formatValueImpl(w, cast(const ubyte[]) obj, f);
}
else static if (!isInputRange!T)
{
alias U = Unqual!(ArrayTypeOf!T);
static assert(isInputRange!U, U.stringof ~ " must be an InputRange");
U val = obj;
formatValueImpl(w, val, f);
}
else
{
formatRange(w, obj, f);
}
}
// https://issues.dlang.org/show_bug.cgi?id=20848
@safe unittest
{
class C
{
immutable(void)[] data;
}
import std.typecons : Nullable;
Nullable!C c;
}
// alias this, input range I/F, and toString()
@safe unittest
{
struct S(int flags)
{
int[] arr;
static if (flags & 1)
alias arr this;
static if (flags & 2)
{
@property bool empty() const { return arr.length == 0; }
@property int front() const { return arr[0] * 2; }
void popFront() { arr = arr[1 .. $]; }
}
static if (flags & 4)
string toString() const { return "S"; }
}
formatTest(S!0b000([0, 1, 2]), "S!0([0, 1, 2])");
formatTest(S!0b001([0, 1, 2]), "[0, 1, 2]"); // Test for bug 7628
formatTest(S!0b010([0, 1, 2]), "[0, 2, 4]");
formatTest(S!0b011([0, 1, 2]), "[0, 2, 4]");
formatTest(S!0b100([0, 1, 2]), "S");
formatTest(S!0b101([0, 1, 2]), "S"); // Test for bug 7628
formatTest(S!0b110([0, 1, 2]), "S");
formatTest(S!0b111([0, 1, 2]), "S");
}
@safe unittest
{
// void[]
void[] val0;
formatTest(val0, "[]");
void[] val = cast(void[]) cast(ubyte[])[1, 2, 3];
formatTest(val, "[1, 2, 3]");
void[0] sval0 = [];
formatTest(sval0, "[]");
void[3] sval = () @trusted { return cast(void[3]) cast(ubyte[3])[1, 2, 3]; } ();
formatTest(sval, "[1, 2, 3]");
}
@safe unittest
{
// const(T[]) -> const(T)[]
const short[] a = [1, 2, 3];
formatTest(a, "[1, 2, 3]");
struct S
{
const(int[]) arr;
alias arr this;
}
auto s = S([1,2,3]);
formatTest(s, "[1, 2, 3]");
}
@safe unittest
{
// nested range formatting with array of string
formatTest("%({%(%02x %)}%| %)", ["test", "msg"],
`{74 65 73 74} {6d 73 67}`);
}
@safe unittest
{
// stop auto escaping inside range formatting
auto arr = ["hello", "world"];
formatTest("%(%s, %)", arr, `"hello", "world"`);
formatTest("%-(%s, %)", arr, `hello, world`);
auto aa1 = [1:"hello", 2:"world"];
formatTest("%(%s:%s, %)", aa1, [`1:"hello", 2:"world"`, `2:"world", 1:"hello"`]);
formatTest("%-(%s:%s, %)", aa1, [`1:hello, 2:world`, `2:world, 1:hello`]);
auto aa2 = [1:["ab", "cd"], 2:["ef", "gh"]];
formatTest("%-(%s:%s, %)", aa2, [`1:["ab", "cd"], 2:["ef", "gh"]`, `2:["ef", "gh"], 1:["ab", "cd"]`]);
formatTest("%-(%s:%(%s%), %)", aa2, [`1:"ab""cd", 2:"ef""gh"`, `2:"ef""gh", 1:"ab""cd"`]);
formatTest("%-(%s:%-(%s%)%|, %)", aa2, [`1:abcd, 2:efgh`, `2:efgh, 1:abcd`]);
}
// https://issues.dlang.org/show_bug.cgi?id=18778
@safe pure unittest
{
assert(format("%-(%1$s - %1$s, %)", ["A", "B", "C"]) == "A - A, B - B, C - C");
}
@safe pure unittest
{
int[] a = [ 1, 3, 2 ];
formatTest("testing %(%s & %) embedded", a,
"testing 1 & 3 & 2 embedded");
formatTest("testing %((%s) %)) wyda3", a,
"testing (1) (3) (2) wyda3");
int[0] empt = [];
formatTest("(%s)", empt, "([])");
}
// input range formatting
private void formatRange(Writer, T, Char)(ref Writer w, ref T val, scope const ref FormatSpec!Char f)
if (isInputRange!T)
{
import std.conv : text;
import std.format : FormatException, formatValue, NoOpSink;
import std.range.primitives : ElementType, empty, front, hasLength,
walkLength, isForwardRange, isInfinite, popFront, put;
// in this mode, we just want to do a representative print to discover
// if the format spec is valid
enum formatTestMode = is(Writer == NoOpSink);
// Formatting character ranges like string
if (f.spec == 's')
{
alias E = ElementType!T;
static if (!is(E == enum) && is(CharTypeOf!E))
{
static if (is(StringTypeOf!T))
writeAligned(w, val[0 .. f.precision < $ ? f.precision : $], f);
else
{
if (!f.flDash)
{
static if (hasLength!T)
{
// right align
auto len = val.length;
}
else static if (isForwardRange!T && !isInfinite!T)
{
auto len = walkLength(val.save);
}
else
{
import std.format : enforceFmt;
enforceFmt(f.width == 0, "Cannot right-align a range without length");
size_t len = 0;
}
if (f.precision != f.UNSPECIFIED && len > f.precision)
len = f.precision;
if (f.width > len)
foreach (i ; 0 .. f.width - len)
put(w, ' ');
if (f.precision == f.UNSPECIFIED)
put(w, val);
else
{
size_t printed = 0;
for (; !val.empty && printed < f.precision; val.popFront(), ++printed)
put(w, val.front);
}
}
else
{
size_t printed = void;
// left align
if (f.precision == f.UNSPECIFIED)
{
static if (hasLength!T)
{
printed = val.length;
put(w, val);
}
else
{
printed = 0;
for (; !val.empty; val.popFront(), ++printed)
{
put(w, val.front);
static if (formatTestMode) break; // one is enough to test
}
}
}
else
{
printed = 0;
for (; !val.empty && printed < f.precision; val.popFront(), ++printed)
put(w, val.front);
}
if (f.width > printed)
foreach (i ; 0 .. f.width - printed)
put(w, ' ');
}
}
}
else
{
put(w, f.seqBefore);
if (!val.empty)
{
formatElement(w, val.front, f);
val.popFront();
for (size_t i; !val.empty; val.popFront(), ++i)
{
put(w, f.seqSeparator);
formatElement(w, val.front, f);
static if (formatTestMode) break; // one is enough to test
}
}
static if (!isInfinite!T) put(w, f.seqAfter);
}
}
else if (f.spec == 'r')
{
static if (is(DynamicArrayTypeOf!T))
{
alias ARR = DynamicArrayTypeOf!T;
scope a = cast(ARR) val;
foreach (e ; a)
{
formatValue(w, e, f);
static if (formatTestMode) break; // one is enough to test
}
}
else
{
for (size_t i; !val.empty; val.popFront(), ++i)
{
formatValue(w, val.front, f);
static if (formatTestMode) break; // one is enough to test
}
}
}
else if (f.spec == '(')
{
if (val.empty)
return;
// Nested specifier is to be used
for (;;)
{
auto fmt = FormatSpec!Char(f.nested);
w: while (true)
{
immutable r = fmt.writeUpToNextSpec(w);
// There was no format specifier, so break
if (!r)
break;
if (f.flDash)
formatValue(w, val.front, fmt);
else
formatElement(w, val.front, fmt);
// Check if there will be a format specifier farther on in the
// string. If so, continue the loop, otherwise break. This
// prevents extra copies of the `sep` from showing up.
foreach (size_t i; 0 .. fmt.trailing.length)
if (fmt.trailing[i] == '%')
continue w;
break w;
}
static if (formatTestMode)
{
break; // one is enough to test
}
else
{
if (f.sep !is null)
{
put(w, fmt.trailing);
val.popFront();
if (val.empty)
break;
put(w, f.sep);
}
else
{
val.popFront();
if (val.empty)
break;
put(w, fmt.trailing);
}
}
}
}
else
throw new FormatException(text("Incorrect format specifier for range: %", f.spec));
}
// https://issues.dlang.org/show_bug.cgi?id=20218
@safe pure unittest
{
void notCalled()
{
import std.range : repeat;
auto value = 1.repeat;
// test that range is not evaluated to completion at compiletime
format!"%s"(value);
}
}
// character formatting with ecaping
void formatChar(Writer)(ref Writer w, in dchar c, in char quote)
{
import std.format : formattedWrite;
import std.range.primitives : put;
import std.uni : isGraphical;
string fmt;
if (isGraphical(c))
{
if (c == quote || c == '\\')
put(w, '\\');
put(w, c);
return;
}
else if (c <= 0xFF)
{
if (c < 0x20)
{
foreach (i, k; "\n\r\t\a\b\f\v\0")
{
if (c == k)
{
put(w, '\\');
put(w, "nrtabfv0"[i]);
return;
}
}
}
fmt = "\\x%02X";
}
else if (c <= 0xFFFF)
fmt = "\\u%04X";
else
fmt = "\\U%08X";
formattedWrite(w, fmt, cast(uint) c);
}
/*
Associative arrays are formatted by using `':'` and $(D ", ") as
separators, and enclosed by `'['` and `']'`.
*/
void formatValueImpl(Writer, T, Char)(auto ref Writer w, T obj, scope const ref FormatSpec!Char f)
if (is(AssocArrayTypeOf!T) && !is(T == enum) && !hasToString!(T, Char))
{
import std.format : enforceFmt, formatValue;
import std.range.primitives : put;
AssocArrayTypeOf!T val = obj;
const spec = f.spec;
enforceFmt(spec == 's' || spec == '(',
"incompatible format character for associative array argument: %" ~ spec);
enum const(Char)[] defSpec = "%s" ~ f.keySeparator ~ "%s" ~ f.seqSeparator;
auto fmtSpec = spec == '(' ? f.nested : defSpec;
auto key_first = true;
// testing correct nested format spec
import std.format : NoOpSink;
auto noop = NoOpSink();
auto test = FormatSpec!Char(fmtSpec);
enforceFmt(test.writeUpToNextSpec(noop),
"nested format string for associative array contains no format specifier");
enforceFmt(test.indexStart <= 2,
"positional parameter in nested format string for associative array may only be 1 or 2");
if (test.indexStart == 2)
key_first = false;
enforceFmt(test.writeUpToNextSpec(noop),
"nested format string for associative array contains only one format specifier");
enforceFmt(test.indexStart <= 2,
"positional parameter in nested format string for associative array may only be 1 or 2");
enforceFmt(test.indexStart == 0 || ((test.indexStart == 2) == key_first),
"wrong combination of positional parameters in nested format string");
enforceFmt(!test.writeUpToNextSpec(noop),
"nested format string for associative array contains more than two format specifiers");
size_t i = 0;
immutable end = val.length;
if (spec == 's')
put(w, f.seqBefore);
foreach (k, ref v; val)
{
auto fmt = FormatSpec!Char(fmtSpec);
foreach (pos; 1 .. 3)
{
fmt.writeUpToNextSpec(w);
if (key_first == (pos == 1))
{
if (f.flDash)
formatValue(w, k, fmt);
else
formatElement(w, k, fmt);
}
else
{
if (f.flDash)
formatValue(w, v, fmt);
else
formatElement(w, v, fmt);
}
}
if (f.sep !is null)
{
fmt.writeUpToNextSpec(w);
if (++i != end)
put(w, f.sep);
}
else
{
if (++i != end)
fmt.writeUpToNextSpec(w);
}
}
if (spec == 's')
put(w, f.seqAfter);
}
@safe unittest
{
import std.exception : collectExceptionMsg;
import std.format : FormatException;
import std.range.primitives : back;
assert(collectExceptionMsg!FormatException(format("%d", [0:1])).back == 'd');
int[string] aa0;
formatTest(aa0, `[]`);
// elements escaping
formatTest(["aaa":1, "bbb":2],
[`["aaa":1, "bbb":2]`, `["bbb":2, "aaa":1]`]);
formatTest(['c':"str"],
`['c':"str"]`);
formatTest(['"':"\"", '\'':"'"],
[`['"':"\"", '\'':"'"]`, `['\'':"'", '"':"\""]`]);
// range formatting for AA
auto aa3 = [1:"hello", 2:"world"];
// escape
formatTest("{%(%s:%s $ %)}", aa3,
[`{1:"hello" $ 2:"world"}`, `{2:"world" $ 1:"hello"}`]);
// use range formatting for key and value, and use %|
formatTest("{%([%04d->%(%c.%)]%| $ %)}", aa3,
[`{[0001->h.e.l.l.o] $ [0002->w.o.r.l.d]}`,
`{[0002->w.o.r.l.d] $ [0001->h.e.l.l.o]}`]);
// https://issues.dlang.org/show_bug.cgi?id=12135
formatTest("%(%s:<%s>%|,%)", [1:2], "1:<2>");
formatTest("%(%s:<%s>%|%)" , [1:2], "1:<2>");
}
@safe unittest
{
struct S1
{
int[char] val;
alias val this;
}
struct S2
{
int[char] val;
alias val this;
string toString() const { return "S"; }
}
formatTest(S1(['c':1, 'd':2]), [`['c':1, 'd':2]`, `['d':2, 'c':1]`]);
formatTest(S2(['c':1, 'd':2]), "S");
}
// https://issues.dlang.org/show_bug.cgi?id=21875
@safe unittest
{
import std.exception : assertThrown;
import std.format : FormatException;
auto aa = [ 1 : "x", 2 : "y", 3 : "z" ];
assertThrown!FormatException(format("%(%)", aa));
assertThrown!FormatException(format("%(%s%)", aa));
assertThrown!FormatException(format("%(%s%s%s%)", aa));
}
@safe unittest
{
import std.exception : assertThrown;
import std.format : FormatException;
auto aa = [ 1 : "x", 2 : "y", 3 : "z" ];
assertThrown!FormatException(format("%(%3$s%s%)", aa));
assertThrown!FormatException(format("%(%s%3$s%)", aa));
assertThrown!FormatException(format("%(%1$s%1$s%)", aa));
assertThrown!FormatException(format("%(%2$s%2$s%)", aa));
assertThrown!FormatException(format("%(%s%1$s%)", aa));
}
// https://issues.dlang.org/show_bug.cgi?id=21808
@safe unittest
{
auto spelled = [ 1 : "one" ];
assert(format("%-(%2$s (%1$s)%|, %)", spelled) == "one (1)");
spelled[2] = "two";
auto result = format("%-(%2$s (%1$s)%|, %)", spelled);
assert(result == "one (1), two (2)" || result == "two (2), one (1)");
}
enum HasToStringResult
{
none,
hasSomeToString,
inCharSink,
inCharSinkFormatString,
inCharSinkFormatSpec,
constCharSink,
constCharSinkFormatString,
constCharSinkFormatSpec,
customPutWriter,
customPutWriterFormatSpec,
}
private alias DScannerBug895 = int[256];
private immutable bool hasPreviewIn = ((in DScannerBug895 a) { return __traits(isRef, a); })(DScannerBug895.init);
template hasToString(T, Char)
{
static if (isPointer!T)
{
// X* does not have toString, even if X is aggregate type has toString.
enum hasToString = HasToStringResult.none;
}
else static if (is(typeof(
(T val) {
const FormatSpec!Char f;
static struct S
{
@disable this(this);
void put(scope Char s){}
}
S s;
val.toString(s, f);
})))
{
enum hasToString = HasToStringResult.customPutWriterFormatSpec;
}
else static if (is(typeof(
(T val) {
static struct S
{
@disable this(this);
void put(scope Char s){}
}
S s;
val.toString(s);
})))
{
enum hasToString = HasToStringResult.customPutWriter;
}
else static if (is(typeof((T val) { FormatSpec!Char f; val.toString((scope const(char)[] s){}, f); })))
{
enum hasToString = HasToStringResult.constCharSinkFormatSpec;
}
else static if (is(typeof((T val) { val.toString((scope const(char)[] s){}, "%s"); })))
{
enum hasToString = HasToStringResult.constCharSinkFormatString;
}
else static if (is(typeof((T val) { val.toString((scope const(char)[] s){}); })))
{
enum hasToString = HasToStringResult.constCharSink;
}
else static if (hasPreviewIn &&
is(typeof((T val) { FormatSpec!Char f; val.toString((in char[] s){}, f); })))
{
enum hasToString = HasToStringResult.inCharSinkFormatSpec;
}
else static if (hasPreviewIn &&
is(typeof((T val) { val.toString((in char[] s){}, "%s"); })))
{
enum hasToString = HasToStringResult.inCharSinkFormatString;
}
else static if (hasPreviewIn &&
is(typeof((T val) { val.toString((in char[] s){}); })))
{
enum hasToString = HasToStringResult.inCharSink;
}
else static if (is(ReturnType!((T val) { return val.toString(); }) S) && isSomeString!S)
{
enum hasToString = HasToStringResult.hasSomeToString;
}
else
{
enum hasToString = HasToStringResult.none;
}
}
@safe unittest
{
import std.range.primitives : isOutputRange;
static struct A
{
void toString(Writer)(ref Writer w)
if (isOutputRange!(Writer, string))
{}
}
static struct B
{
void toString(scope void delegate(scope const(char)[]) sink, scope FormatSpec!char fmt) {}
}
static struct C
{
void toString(scope void delegate(scope const(char)[]) sink, string fmt) {}
}
static struct D
{
void toString(scope void delegate(scope const(char)[]) sink) {}
}
static struct E
{
string toString() {return "";}
}
static struct F
{
void toString(Writer)(ref Writer w, scope const ref FormatSpec!char fmt)
if (isOutputRange!(Writer, string))
{}
}
static struct G
{
string toString() {return "";}
void toString(Writer)(ref Writer w)
if (isOutputRange!(Writer, string)) {}
}
static struct H
{
string toString() {return "";}
void toString(Writer)(ref Writer w, scope const ref FormatSpec!char fmt)
if (isOutputRange!(Writer, string))
{}
}
static struct I
{
void toString(Writer)(ref Writer w)
if (isOutputRange!(Writer, string)) {}
void toString(Writer)(ref Writer w, scope const ref FormatSpec!char fmt)
if (isOutputRange!(Writer, string))
{}
}
static struct J
{
string toString() {return "";}
void toString(Writer)(ref Writer w, scope ref FormatSpec!char fmt)
if (isOutputRange!(Writer, string))
{}
}
static struct K
{
void toString(Writer)(Writer w, scope const ref FormatSpec!char fmt)
if (isOutputRange!(Writer, string))
{}
}
static struct L
{
void toString(Writer)(ref Writer w, scope const FormatSpec!char fmt)
if (isOutputRange!(Writer, string))
{}
}
static struct M
{
void toString(scope void delegate(in char[]) sink, in FormatSpec!char fmt) {}
}
static struct N
{
void toString(scope void delegate(in char[]) sink, string fmt) {}
}
static struct O
{
void toString(scope void delegate(in char[]) sink) {}
}
with(HasToStringResult)
{
static assert(hasToString!(A, char) == customPutWriter);
static assert(hasToString!(B, char) == constCharSinkFormatSpec);
static assert(hasToString!(C, char) == constCharSinkFormatString);
static assert(hasToString!(D, char) == constCharSink);
static assert(hasToString!(E, char) == hasSomeToString);
static assert(hasToString!(F, char) == customPutWriterFormatSpec);
static assert(hasToString!(G, char) == customPutWriter);
static assert(hasToString!(H, char) == customPutWriterFormatSpec);
static assert(hasToString!(I, char) == customPutWriterFormatSpec);
static assert(hasToString!(J, char) == hasSomeToString
|| hasToString!(J, char) == constCharSinkFormatSpec); // depends on -preview=rvaluerefparam
static assert(hasToString!(K, char) == constCharSinkFormatSpec);
static assert(hasToString!(L, char) == customPutWriterFormatSpec);
static if (hasPreviewIn)
{
static assert(hasToString!(M, char) == inCharSinkFormatSpec);
static assert(hasToString!(N, char) == inCharSinkFormatString);
static assert(hasToString!(O, char) == inCharSink);
}
}
}
// const toString methods
@safe unittest
{
import std.range.primitives : isOutputRange;
static struct A
{
void toString(Writer)(ref Writer w) const
if (isOutputRange!(Writer, string))
{}
}
static struct B
{
void toString(scope void delegate(scope const(char)[]) sink, scope FormatSpec!char fmt) const {}
}
static struct C
{
void toString(scope void delegate(scope const(char)[]) sink, string fmt) const {}
}
static struct D
{
void toString(scope void delegate(scope const(char)[]) sink) const {}
}
static struct E
{
string toString() const {return "";}
}
static struct F
{
void toString(Writer)(ref Writer w, scope const ref FormatSpec!char fmt) const
if (isOutputRange!(Writer, string))
{}
}
static struct G
{
string toString() const {return "";}
void toString(Writer)(ref Writer w) const
if (isOutputRange!(Writer, string)) {}
}
static struct H
{
string toString() const {return "";}
void toString(Writer)(ref Writer w, scope const ref FormatSpec!char fmt) const
if (isOutputRange!(Writer, string))
{}
}
static struct I
{
void toString(Writer)(ref Writer w) const
if (isOutputRange!(Writer, string)) {}
void toString(Writer)(ref Writer w, scope const ref FormatSpec!char fmt) const
if (isOutputRange!(Writer, string))
{}
}
static struct J
{
string toString() const {return "";}
void toString(Writer)(ref Writer w, scope ref FormatSpec!char fmt) const
if (isOutputRange!(Writer, string))
{}
}
static struct K
{
void toString(Writer)(Writer w, scope const ref FormatSpec!char fmt) const
if (isOutputRange!(Writer, string))
{}
}
static struct L
{
void toString(Writer)(ref Writer w, scope const FormatSpec!char fmt) const
if (isOutputRange!(Writer, string))
{}
}
static struct M
{
void toString(scope void delegate(in char[]) sink, in FormatSpec!char fmt) const {}
}
static struct N
{
void toString(scope void delegate(in char[]) sink, string fmt) const {}
}
static struct O
{
void toString(scope void delegate(in char[]) sink) const {}
}
with(HasToStringResult)
{
static assert(hasToString!(A, char) == customPutWriter);
static assert(hasToString!(B, char) == constCharSinkFormatSpec);
static assert(hasToString!(C, char) == constCharSinkFormatString);
static assert(hasToString!(D, char) == constCharSink);
static assert(hasToString!(E, char) == hasSomeToString);
static assert(hasToString!(F, char) == customPutWriterFormatSpec);
static assert(hasToString!(G, char) == customPutWriter);
static assert(hasToString!(H, char) == customPutWriterFormatSpec);
static assert(hasToString!(I, char) == customPutWriterFormatSpec);
static assert(hasToString!(J, char) == hasSomeToString
|| hasToString!(J, char) == constCharSinkFormatSpec); // depends on -preview=rvaluerefparam
static assert(hasToString!(K, char) == constCharSinkFormatSpec);
static assert(hasToString!(L, char) == HasToStringResult.customPutWriterFormatSpec);
static if (hasPreviewIn)
{
static assert(hasToString!(M, char) == inCharSinkFormatSpec);
static assert(hasToString!(N, char) == inCharSinkFormatString);
static assert(hasToString!(O, char) == inCharSink);
}
// https://issues.dlang.org/show_bug.cgi?id=22873
static assert(hasToString!(inout(A), char) == customPutWriter);
static assert(hasToString!(inout(B), char) == constCharSinkFormatSpec);
static assert(hasToString!(inout(C), char) == constCharSinkFormatString);
static assert(hasToString!(inout(D), char) == constCharSink);
static assert(hasToString!(inout(E), char) == hasSomeToString);
static assert(hasToString!(inout(F), char) == customPutWriterFormatSpec);
static assert(hasToString!(inout(G), char) == customPutWriter);
static assert(hasToString!(inout(H), char) == customPutWriterFormatSpec);
static assert(hasToString!(inout(I), char) == customPutWriterFormatSpec);
static assert(hasToString!(inout(J), char) == hasSomeToString
|| hasToString!(inout(J), char) == constCharSinkFormatSpec); // depends on -preview=rvaluerefparam
static assert(hasToString!(inout(K), char) == constCharSinkFormatSpec);
static assert(hasToString!(inout(L), char) == customPutWriterFormatSpec);
static if (hasPreviewIn)
{
static assert(hasToString!(inout(M), char) == inCharSinkFormatSpec);
static assert(hasToString!(inout(N), char) == inCharSinkFormatString);
static assert(hasToString!(inout(O), char) == inCharSink);
}
}
}
// object formatting with toString
private void formatObject(Writer, T, Char)(ref Writer w, ref T val, scope const ref FormatSpec!Char f)
if (hasToString!(T, Char))
{
import std.format : NoOpSink;
import std.range.primitives : put;
enum overload = hasToString!(T, Char);
enum noop = is(Writer == NoOpSink);
static if (overload == HasToStringResult.customPutWriterFormatSpec)
{
static if (!noop) val.toString(w, f);
}
else static if (overload == HasToStringResult.customPutWriter)
{
static if (!noop) val.toString(w);
}
else static if (overload == HasToStringResult.constCharSinkFormatSpec)
{
static if (!noop) val.toString((scope const(char)[] s) { put(w, s); }, f);
}
else static if (overload == HasToStringResult.constCharSinkFormatString)
{
static if (!noop) val.toString((scope const(char)[] s) { put(w, s); }, f.getCurFmtStr());
}
else static if (overload == HasToStringResult.constCharSink)
{
static if (!noop) val.toString((scope const(char)[] s) { put(w, s); });
}
else static if (overload == HasToStringResult.inCharSinkFormatSpec)
{
static if (!noop) val.toString((in char[] s) { put(w, s); }, f);
}
else static if (overload == HasToStringResult.inCharSinkFormatString)
{
static if (!noop) val.toString((in char[] s) { put(w, s); }, f.getCurFmtStr());
}
else static if (overload == HasToStringResult.inCharSink)
{
static if (!noop) val.toString((in char[] s) { put(w, s); });
}
else static if (overload == HasToStringResult.hasSomeToString)
{
static if (!noop) put(w, val.toString());
}
else
{
static assert(0, "No way found to format " ~ T.stringof ~ " as string");
}
}
@system unittest
{
import std.exception : assertThrown;
import std.format : FormatException;
static interface IF1 { }
class CIF1 : IF1 { }
static struct SF1 { }
static union UF1 { }
static class CF1 { }
static interface IF2 { string toString(); }
static class CIF2 : IF2 { override string toString() { return ""; } }
static struct SF2 { string toString() { return ""; } }
static union UF2 { string toString() { return ""; } }
static class CF2 { override string toString() { return ""; } }
static interface IK1 { void toString(scope void delegate(scope const(char)[]) sink,
FormatSpec!char) const; }
static class CIK1 : IK1 { override void toString(scope void delegate(scope const(char)[]) sink,
FormatSpec!char) const { sink("CIK1"); } }
static struct KS1 { void toString(scope void delegate(scope const(char)[]) sink,
FormatSpec!char) const { sink("KS1"); } }
static union KU1 { void toString(scope void delegate(scope const(char)[]) sink,
FormatSpec!char) const { sink("KU1"); } }
static class KC1 { void toString(scope void delegate(scope const(char)[]) sink,
FormatSpec!char) const { sink("KC1"); } }
IF1 cif1 = new CIF1;
assertThrown!FormatException(format("%f", cif1));
assertThrown!FormatException(format("%f", SF1()));
assertThrown!FormatException(format("%f", UF1()));
assertThrown!FormatException(format("%f", new CF1()));
IF2 cif2 = new CIF2;
assertThrown!FormatException(format("%f", cif2));
assertThrown!FormatException(format("%f", SF2()));
assertThrown!FormatException(format("%f", UF2()));
assertThrown!FormatException(format("%f", new CF2()));
IK1 cik1 = new CIK1;
assert(format("%f", cik1) == "CIK1");
assert(format("%f", KS1()) == "KS1");
assert(format("%f", KU1()) == "KU1");
assert(format("%f", new KC1()) == "KC1");
}
/*
Aggregates
*/
void formatValueImpl(Writer, T, Char)(auto ref Writer w, T val, scope const ref FormatSpec!Char f)
if (is(T == class) && !is(T == enum))
{
import std.range.primitives : put;
enforceValidFormatSpec!(T, Char)(f);
// TODO: remove this check once `@disable override` deprecation cycle is finished
static if (__traits(hasMember, T, "toString") && isSomeFunction!(val.toString))
static assert(!__traits(isDisabled, T.toString), T.stringof ~
" cannot be formatted because its `toString` is marked with `@disable`");
if (val is null)
put(w, "null");
else
{
import std.algorithm.comparison : among;
enum overload = hasToString!(T, Char);
with(HasToStringResult)
static if ((is(T == immutable) || is(T == const) || is(T == shared)) && overload == none)
{
// Remove this when Object gets const toString
// https://issues.dlang.org/show_bug.cgi?id=7879
static if (is(T == immutable))
put(w, "immutable(");
else static if (is(T == const))
put(w, "const(");
else static if (is(T == shared))
put(w, "shared(");
put(w, typeid(Unqual!T).name);
put(w, ')');
}
else static if (overload.among(constCharSink, constCharSinkFormatString, constCharSinkFormatSpec) ||
(!isInputRange!T && !is(BuiltinTypeOf!T)))
{
formatObject!(Writer, T, Char)(w, val, f);
}
else
{
static if (!is(__traits(parent, T.toString) == Object)) // not inherited Object.toString
{
formatObject(w, val, f);
}
else static if (isInputRange!T)
{
formatRange(w, val, f);
}
else static if (is(BuiltinTypeOf!T X))
{
X x = val;
formatValueImpl(w, x, f);
}
else
{
formatObject(w, val, f);
}
}
}
}
@system unittest
{
import std.array : appender;
import std.range.interfaces : inputRangeObject;
// class range (https://issues.dlang.org/show_bug.cgi?id=5154)
auto c = inputRangeObject([1,2,3,4]);
formatTest(c, "[1, 2, 3, 4]");
assert(c.empty);
c = null;
formatTest(c, "null");
}
@system unittest
{
// https://issues.dlang.org/show_bug.cgi?id=5354
// If the class has both range I/F and custom toString, the use of custom
// toString routine is prioritized.
// Enable the use of custom toString that gets a sink delegate
// for class formatting.
enum inputRangeCode =
q{
int[] arr;
this(int[] a){ arr = a; }
@property int front() const { return arr[0]; }
@property bool empty() const { return arr.length == 0; }
void popFront(){ arr = arr[1 .. $]; }
};
class C1
{
mixin(inputRangeCode);
void toString(scope void delegate(scope const(char)[]) dg,
scope const ref FormatSpec!char f) const
{
dg("[012]");
}
}
class C2
{
mixin(inputRangeCode);
void toString(scope void delegate(const(char)[]) dg, string f) const { dg("[012]"); }
}
class C3
{
mixin(inputRangeCode);
void toString(scope void delegate(const(char)[]) dg) const { dg("[012]"); }
}
class C4
{
mixin(inputRangeCode);
override string toString() const { return "[012]"; }
}
class C5
{
mixin(inputRangeCode);
}
formatTest(new C1([0, 1, 2]), "[012]");
formatTest(new C2([0, 1, 2]), "[012]");
formatTest(new C3([0, 1, 2]), "[012]");
formatTest(new C4([0, 1, 2]), "[012]");
formatTest(new C5([0, 1, 2]), "[0, 1, 2]");
}
// outside the unittest block, otherwise the FQN of the
// class contains the line number of the unittest
version (StdUnittest)
{
private class C {}
}
// https://issues.dlang.org/show_bug.cgi?id=7879
@safe unittest
{
const(C) c;
auto s = format("%s", c);
assert(s == "null");
immutable(C) c2 = new C();
s = format("%s", c2);
assert(s == "immutable(std.format.internal.write.C)");
const(C) c3 = new C();
s = format("%s", c3);
assert(s == "const(std.format.internal.write.C)");
shared(C) c4 = new C();
s = format("%s", c4);
assert(s == "shared(std.format.internal.write.C)");
}
// https://issues.dlang.org/show_bug.cgi?id=7879
@safe unittest
{
class F
{
override string toString() const @safe
{
return "Foo";
}
}
const(F) c;
auto s = format("%s", c);
assert(s == "null");
const(F) c2 = new F();
s = format("%s", c2);
assert(s == "Foo", s);
}
void formatValueImpl(Writer, T, Char)(auto ref Writer w, T val, scope const ref FormatSpec!Char f)
if (is(T == interface) && (hasToString!(T, Char) || !is(BuiltinTypeOf!T)) && !is(T == enum))
{
import std.range.primitives : put;
enforceValidFormatSpec!(T, Char)(f);
if (val is null)
put(w, "null");
else
{
static if (__traits(hasMember, T, "toString") && isSomeFunction!(val.toString))
static assert(!__traits(isDisabled, T.toString), T.stringof ~
" cannot be formatted because its `toString` is marked with `@disable`");
static if (hasToString!(T, Char) != HasToStringResult.none)
{
formatObject(w, val, f);
}
else static if (isInputRange!T)
{
formatRange(w, val, f);
}
else
{
version (Windows)
{
import core.sys.windows.com : IUnknown;
static if (is(T : IUnknown))
{
formatValueImpl(w, *cast(void**)&val, f);
}
else
{
formatValueImpl(w, cast(Object) val, f);
}
}
else
{
formatValueImpl(w, cast(Object) val, f);
}
}
}
}
@system unittest
{
import std.range.interfaces : InputRange, inputRangeObject;
// interface
InputRange!int i = inputRangeObject([1,2,3,4]);
formatTest(i, "[1, 2, 3, 4]");
assert(i.empty);
i = null;
formatTest(i, "null");
// interface (downcast to Object)
interface Whatever {}
class C : Whatever
{
override @property string toString() const { return "ab"; }
}
Whatever val = new C;
formatTest(val, "ab");
// https://issues.dlang.org/show_bug.cgi?id=11175
version (Windows)
{
import core.sys.windows.com : IID, IUnknown;
import core.sys.windows.windef : HRESULT;
interface IUnknown2 : IUnknown { }
class D : IUnknown2
{
extern(Windows) HRESULT QueryInterface(const(IID)* riid, void** pvObject) { return typeof(return).init; }
extern(Windows) uint AddRef() { return 0; }
extern(Windows) uint Release() { return 0; }
}
IUnknown2 d = new D;
string expected = format("%X", cast(void*) d);
formatTest(d, expected);
}
}
// Maybe T is noncopyable struct, so receive it by 'auto ref'.
void formatValueImpl(Writer, T, Char)(auto ref Writer w, auto ref T val,
scope const ref FormatSpec!Char f)
if ((is(T == struct) || is(T == union)) && (hasToString!(T, Char) || !is(BuiltinTypeOf!T))
&& !is(T == enum))
{
import std.range.primitives : put;
static if (__traits(hasMember, T, "toString") && isSomeFunction!(val.toString))
static assert(!__traits(isDisabled, T.toString), T.stringof ~
" cannot be formatted because its `toString` is marked with `@disable`");
enforceValidFormatSpec!(T, Char)(f);
static if (hasToString!(T, Char))
{
formatObject(w, val, f);
}
else static if (isInputRange!T)
{
formatRange(w, val, f);
}
else static if (is(T == struct))
{
enum left = T.stringof~"(";
enum separator = ", ";
enum right = ")";
put(w, left);
static foreach (i; 0 .. T.tupleof.length)
{{
static if (__traits(identifier, val.tupleof[i]) == "this")
{
// ignore hidden context pointer
}
else static if (0 < i && T.tupleof[i-1].offsetof == T.tupleof[i].offsetof)
{
static if (i == T.tupleof.length - 1 || T.tupleof[i].offsetof != T.tupleof[i+1].offsetof)
{
enum el = separator ~ __traits(identifier, T.tupleof[i]) ~ "}";
put(w, el);
}
else
{
enum el = separator ~ __traits(identifier, T.tupleof[i]);
put(w, el);
}
}
else static if (i+1 < T.tupleof.length && T.tupleof[i].offsetof == T.tupleof[i+1].offsetof)
{
enum el = (i > 0 ? separator : "") ~ "#{overlap " ~ __traits(identifier, T.tupleof[i]);
put(w, el);
}
else
{
static if (i > 0)
put(w, separator);
formatElement(w, val.tupleof[i], f);
}
}}
put(w, right);
}
else
{
put(w, T.stringof);
}
}
// https://issues.dlang.org/show_bug.cgi?id=9588
@safe pure unittest
{
struct S { int x; bool empty() { return false; } }
formatTest(S(), "S(0)");
}
// https://issues.dlang.org/show_bug.cgi?id=4638
@safe unittest
{
struct U8 { string toString() const { return "blah"; } }
struct U16 { wstring toString() const { return "blah"; } }
struct U32 { dstring toString() const { return "blah"; } }
formatTest(U8(), "blah");
formatTest(U16(), "blah");
formatTest(U32(), "blah");
}
// https://issues.dlang.org/show_bug.cgi?id=3890
@safe unittest
{
struct Int{ int n; }
struct Pair{ string s; Int i; }
formatTest(Pair("hello", Int(5)),
`Pair("hello", Int(5))`);
}
// https://issues.dlang.org/show_bug.cgi?id=9117
@safe unittest
{
import std.format : formattedWrite;
static struct Frop {}
static struct Foo
{
int n = 0;
alias n this;
T opCast(T) ()
if (is(T == Frop))
{
return Frop();
}
string toString()
{
return "Foo";
}
}
static struct Bar
{
Foo foo;
alias foo this;
string toString()
{
return "Bar";
}
}
const(char)[] result;
void put(scope const char[] s) { result ~= s; }
Foo foo;
formattedWrite(&put, "%s", foo); // OK
assert(result == "Foo");
result = null;
Bar bar;
formattedWrite(&put, "%s", bar); // NG
assert(result == "Bar");
result = null;
int i = 9;
formattedWrite(&put, "%s", 9);
assert(result == "9");
}
@safe unittest
{
// union formatting without toString
union U1
{
int n;
string s;
}
U1 u1;
formatTest(u1, "U1");
// union formatting with toString
union U2
{
int n;
string s;
string toString() @trusted const { return s; }
}
U2 u2;
() @trusted { u2.s = "hello"; } ();
formatTest(u2, "hello");
}
@safe unittest
{
import std.array : appender;
import std.format : formatValue;
// https://issues.dlang.org/show_bug.cgi?id=7230
static struct Bug7230
{
string s = "hello";
union {
string a;
int b;
double c;
}
long x = 10;
}
Bug7230 bug;
bug.b = 123;
FormatSpec!char f;
auto w = appender!(char[])();
formatValue(w, bug, f);
assert(w.data == `Bug7230("hello", #{overlap a, b, c}, 10)`);
}
@safe unittest
{
import std.array : appender;
import std.format : formatValue;
static struct S{ @disable this(this); }
S s;
FormatSpec!char f;
auto w = appender!string();
formatValue(w, s, f);
assert(w.data == "S()");
}
@safe unittest
{
import std.array : appender;
import std.format : formatValue;
//struct Foo { @disable string toString(); }
//Foo foo;
interface Bar { @disable string toString(); }
Bar bar;
auto w = appender!(char[])();
FormatSpec!char f;
// NOTE: structs cant be tested : the assertion is correct so compilation
// continues and fails when trying to link the unimplemented toString.
//static assert(!__traits(compiles, formatValue(w, foo, f)));
static assert(!__traits(compiles, formatValue(w, bar, f)));
}
// https://issues.dlang.org/show_bug.cgi?id=21722
@safe unittest
{
struct Bar
{
void toString (scope void delegate (scope const(char)[]) sink, string fmt)
{
sink("Hello");
}
}
Bar b;
auto result = () @trusted { return format("%b", b); } ();
assert(result == "Hello");
static if (hasPreviewIn)
{
struct Foo
{
void toString(scope void delegate(in char[]) sink, in FormatSpec!char fmt)
{
sink("Hello");
}
}
Foo f;
assert(format("%b", f) == "Hello");
struct Foo2
{
void toString(scope void delegate(in char[]) sink, string fmt)
{
sink("Hello");
}
}
Foo2 f2;
assert(format("%b", f2) == "Hello");
}
}
@safe unittest
{
import std.array : appender;
import std.format : singleSpec;
// Bug #17269. Behavior similar to `struct A { Nullable!string B; }`
struct StringAliasThis
{
@property string value() const { assert(0); }
alias value this;
string toString() { return "helloworld"; }
private string _value;
}
struct TestContainer
{
StringAliasThis testVar;
}
auto w = appender!string();
auto spec = singleSpec("%s");
formatElement(w, TestContainer(), spec);
assert(w.data == "TestContainer(helloworld)", w.data);
}
// https://issues.dlang.org/show_bug.cgi?id=17269
@safe unittest
{
import std.typecons : Nullable;
struct Foo
{
Nullable!string bar;
}
Foo f;
formatTest(f, "Foo(Nullable.null)");
}
// https://issues.dlang.org/show_bug.cgi?id=19003
@safe unittest
{
struct S
{
int i;
@disable this();
invariant { assert(this.i); }
this(int i) @safe in { assert(i); } do { this.i = i; }
string toString() { return "S"; }
}
S s = S(1);
format!"%s"(s);
}
void enforceValidFormatSpec(T, Char)(scope const ref FormatSpec!Char f)
{
import std.format : enforceFmt;
import std.range : isInputRange;
import std.format.internal.write : hasToString, HasToStringResult;
enum overload = hasToString!(T, Char);
static if (
overload != HasToStringResult.constCharSinkFormatSpec &&
overload != HasToStringResult.constCharSinkFormatString &&
overload != HasToStringResult.inCharSinkFormatSpec &&
overload != HasToStringResult.inCharSinkFormatString &&
overload != HasToStringResult.customPutWriterFormatSpec &&
!isInputRange!T)
{
enforceFmt(f.spec == 's',
"Expected '%s' format specifier for type '" ~ T.stringof ~ "'");
}
}
/*
`enum`s are formatted like their base value
*/
void formatValueImpl(Writer, T, Char)(auto ref Writer w, T val, scope const ref FormatSpec!Char f)
if (is(T == enum))
{
import std.array : appender;
import std.range.primitives : put;
if (f.spec != 's')
return formatValueImpl(w, cast(OriginalType!T) val, f);
foreach (immutable member; __traits(allMembers, T))
if (val == __traits(getMember, T, member))
return formatValueImpl(w, member, f);
auto w2 = appender!string();
// val is not a member of T, output cast(T) rawValue instead.
enum prefix = "cast(" ~ T.stringof ~ ")";
put(w2, prefix);
static assert(!is(OriginalType!T == T), "OriginalType!" ~ T.stringof ~
"must not be equal to " ~ T.stringof);
FormatSpec!Char f2 = f;
f2.width = 0;
formatValueImpl(w2, cast(OriginalType!T) val, f2);
writeAligned(w, w2.data, f);
}
@safe unittest
{
enum A { first, second, third }
formatTest(A.second, "second");
formatTest(cast(A) 72, "cast(A)72");
}
@safe unittest
{
enum A : string { one = "uno", two = "dos", three = "tres" }
formatTest(A.three, "three");
formatTest(cast(A)"mill\&oacute;n", "cast(A)mill\&oacute;n");
}
@safe unittest
{
enum A : bool { no, yes }
formatTest(A.yes, "yes");
formatTest(A.no, "no");
}
@safe unittest
{
// Test for bug 6892
enum Foo { A = 10 }
formatTest("%s", Foo.A, "A");
formatTest(">%4s<", Foo.A, "> A<");
formatTest("%04d", Foo.A, "0010");
formatTest("%+2u", Foo.A, "10");
formatTest("%02x", Foo.A, "0a");
formatTest("%3o", Foo.A, " 12");
formatTest("%b", Foo.A, "1010");
}
@safe pure unittest
{
enum A { one, two, three }
string t1 = format("[%6s] [%-6s]", A.one, A.one);
assert(t1 == "[ one] [one ]");
string t2 = format("[%10s] [%-10s]", cast(A) 10, cast(A) 10);
assert(t2 == "[ cast(A)" ~ "10] [cast(A)" ~ "10 ]"); // due to bug in style checker
}
// https://issues.dlang.org/show_bug.cgi?id=8921
@safe unittest
{
enum E : char { A = 'a', B = 'b', C = 'c' }
E[3] e = [E.A, E.B, E.C];
formatTest(e, "[A, B, C]");
E[] e2 = [E.A, E.B, E.C];
formatTest(e2, "[A, B, C]");
}
/*
Pointers are formatted as hex integers.
*/
void formatValueImpl(Writer, T, Char)(auto ref Writer w, scope const(T) val, scope const ref FormatSpec!Char f)
if (isPointer!T && !is(T == enum) && !hasToString!(T, Char))
{
static if (is(typeof({ shared const void* p = val; })))
alias SharedOf(T) = shared(T);
else
alias SharedOf(T) = T;
const SharedOf!(void*) p = val;
const pnum = () @trusted { return cast(ulong) p; }();
if (f.spec == 's')
{
if (p is null)
{
writeAligned(w, "null", f);
return;
}
FormatSpec!Char fs = f; // fs is copy for change its values.
fs.spec = 'X';
formatValueImpl(w, pnum, fs);
}
else
{
import std.format : enforceFmt;
enforceFmt(f.spec == 'X' || f.spec == 'x',
"Expected one of %s, %x or %X for pointer type.");
formatValueImpl(w, pnum, f);
}
}
@safe pure unittest
{
int* p;
string t1 = format("[%6s] [%-6s]", p, p);
assert(t1 == "[ null] [null ]");
}
@safe pure unittest
{
int* p = null;
formatTest(p, "null");
auto q = () @trusted { return cast(void*) 0xFFEECCAA; }();
formatTest(q, "FFEECCAA");
}
// https://issues.dlang.org/show_bug.cgi?id=11782
@safe pure unittest
{
import std.range : iota;
auto a = iota(0, 10);
auto b = iota(0, 10);
auto p = () @trusted { auto result = &a; return result; }();
assert(format("%s",p) != format("%s",b));
}
@safe pure unittest
{
// Test for https://issues.dlang.org/show_bug.cgi?id=7869
struct S
{
string toString() const { return ""; }
}
S* p = null;
formatTest(p, "null");
S* q = () @trusted { return cast(S*) 0xFFEECCAA; } ();
formatTest(q, "FFEECCAA");
}
// https://issues.dlang.org/show_bug.cgi?id=9336
@system pure unittest
{
shared int i;
format("%s", &i);
}
// https://issues.dlang.org/show_bug.cgi?id=11778
@safe pure unittest
{
import std.exception : assertThrown;
import std.format : FormatException;
int* p = null;
assertThrown!FormatException(format("%d", p));
assertThrown!FormatException(format("%04d", () @trusted { return p + 2; } ()));
}
// https://issues.dlang.org/show_bug.cgi?id=12505
@safe pure unittest
{
void* p = null;
formatTest("%08X", p, "00000000");
}
/*
SIMD vectors are formatted as arrays.
*/
void formatValueImpl(Writer, V, Char)(auto ref Writer w, const(V) val, scope const ref FormatSpec!Char f)
if (isSIMDVector!V)
{
formatValueImpl(w, val.array, f);
}
@safe unittest
{
import core.simd; // cannot be selective, because float4 might not be defined
static if (is(float4))
{
version (X86)
{
version (OSX) {/* https://issues.dlang.org/show_bug.cgi?id=17823 */}
}
else
{
float4 f;
f.array[0] = 1;
f.array[1] = 2;
f.array[2] = 3;
f.array[3] = 4;
formatTest(f, "[1, 2, 3, 4]");
}
}
}
/*
Delegates are formatted by `ReturnType delegate(Parameters) FunctionAttributes`
Known bug: Because of issue https://issues.dlang.org/show_bug.cgi?id=18269
the FunctionAttributes might be wrong.
*/
void formatValueImpl(Writer, T, Char)(auto ref Writer w, scope const(T), scope const ref FormatSpec!Char f)
if (isDelegate!T)
{
formatValueImpl(w, T.stringof, f);
}
@safe unittest
{
import std.array : appender;
import std.format : formatValue;
void func() @system { __gshared int x; ++x; throw new Exception("msg"); }
version (linux)
{
FormatSpec!char f;
auto w = appender!string();
formatValue(w, &func, f);
assert(w.data.length >= 15 && w.data[0 .. 15] == "void delegate()");
}
}
// string elements are formatted like UTF-8 string literals.
void formatElement(Writer, T, Char)(auto ref Writer w, T val, scope const ref FormatSpec!Char f)
if (is(StringTypeOf!T) && !hasToString!(T, Char) && !is(T == enum))
{
import std.array : appender;
import std.format.write : formattedWrite, formatValue;
import std.range.primitives : put;
import std.utf : decode, UTFException;
StringTypeOf!T str = val; // https://issues.dlang.org/show_bug.cgi?id=8015
if (f.spec == 's')
{
try
{
// ignore other specifications and quote
for (size_t i = 0; i < str.length; )
{
auto c = decode(str, i);
// \uFFFE and \uFFFF are considered valid by isValidDchar,
// so need checking for interchange.
if (c == 0xFFFE || c == 0xFFFF)
goto LinvalidSeq;
}
put(w, '\"');
for (size_t i = 0; i < str.length; )
{
auto c = decode(str, i);
formatChar(w, c, '"');
}
put(w, '\"');
return;
}
catch (UTFException)
{
}
// If val contains invalid UTF sequence, formatted like HexString literal
LinvalidSeq:
static if (is(typeof(str[0]) : const(char)))
{
enum type = "";
alias IntArr = const(ubyte)[];
}
else static if (is(typeof(str[0]) : const(wchar)))
{
enum type = "w";
alias IntArr = const(ushort)[];
}
else static if (is(typeof(str[0]) : const(dchar)))
{
enum type = "d";
alias IntArr = const(uint)[];
}
formattedWrite(w, "[%(cast(" ~ type ~ "char) 0x%X%|, %)]", cast(IntArr) str);
}
else
formatValue(w, str, f);
}
@safe pure unittest
{
import std.array : appender;
import std.format.spec : singleSpec;
auto w = appender!string();
auto spec = singleSpec("%s");
formatElement(w, "Hello World", spec);
assert(w.data == "\"Hello World\"");
}
@safe unittest
{
import std.array : appender;
import std.format.spec : singleSpec;
auto w = appender!string();
auto spec = singleSpec("%s");
formatElement(w, "H", spec);
assert(w.data == "\"H\"", w.data);
}
// https://issues.dlang.org/show_bug.cgi?id=15888
@safe pure unittest
{
import std.array : appender;
import std.format.spec : singleSpec;
ushort[] a = [0xFF_FE, 0x42];
auto w = appender!string();
auto spec = singleSpec("%s");
formatElement(w, cast(wchar[]) a, spec);
assert(w.data == `[cast(wchar) 0xFFFE, cast(wchar) 0x42]`);
uint[] b = [0x0F_FF_FF_FF, 0x42];
w = appender!string();
spec = singleSpec("%s");
formatElement(w, cast(dchar[]) b, spec);
assert(w.data == `[cast(dchar) 0xFFFFFFF, cast(dchar) 0x42]`);
}
// Character elements are formatted like UTF-8 character literals.
void formatElement(Writer, T, Char)(auto ref Writer w, T val, scope const ref FormatSpec!Char f)
if (is(CharTypeOf!T) && !is(T == enum))
{
import std.range.primitives : put;
import std.format.write : formatValue;
if (f.spec == 's')
{
put(w, '\'');
formatChar(w, val, '\'');
put(w, '\'');
}
else
formatValue(w, val, f);
}
// Maybe T is noncopyable struct, so receive it by 'auto ref'.
void formatElement(Writer, T, Char)(auto ref Writer w, auto ref T val, scope const ref FormatSpec!Char f)
if ((!is(StringTypeOf!T) || hasToString!(T, Char)) && !is(CharTypeOf!T) || is(T == enum))
{
import std.format.write : formatValue;
formatValue(w, val, f);
}
// Fix for https://issues.dlang.org/show_bug.cgi?id=1591
int getNthInt(string kind, A...)(uint index, A args)
{
return getNth!(kind, isIntegral, int)(index, args);
}
T getNth(string kind, alias Condition, T, A...)(uint index, A args)
{
import std.conv : text, to;
import std.format : FormatException;
switch (index)
{
foreach (n, _; A)
{
case n:
static if (Condition!(typeof(args[n])))
{
return to!T(args[n]);
}
else
{
throw new FormatException(
text(kind, " expected, not ", typeof(args[n]).stringof,
" for argument #", index + 1));
}
}
default:
throw new FormatException(text("Missing ", kind, " argument"));
}
}
private bool needToSwapEndianess(Char)(scope const ref FormatSpec!Char f)
{
import std.system : endian, Endian;
return endian == Endian.littleEndian && f.flPlus
|| endian == Endian.bigEndian && f.flDash;
}
void writeAligned(Writer, T, Char)(auto ref Writer w, T s, scope const ref FormatSpec!Char f)
if (isSomeString!T)
{
FormatSpec!Char fs = f;
fs.flZero = false;
writeAligned(w, "", "", s, fs);
}
@safe pure unittest
{
import std.array : appender;
import std.format : singleSpec;
auto w = appender!string();
auto spec = singleSpec("%s");
writeAligned(w, "a本Ä", spec);
assert(w.data == "a本Ä", w.data);
}
@safe pure unittest
{
import std.array : appender;
import std.format : singleSpec;
auto w = appender!string();
auto spec = singleSpec("%10s");
writeAligned(w, "a本Ä", spec);
assert(w.data == " a本Ä", "|" ~ w.data ~ "|");
}
@safe pure unittest
{
import std.array : appender;
import std.format : singleSpec;
auto w = appender!string();
auto spec = singleSpec("%-10s");
writeAligned(w, "a本Ä", spec);
assert(w.data == "a本Ä ", w.data);
}
enum PrecisionType
{
none,
integer,
fractionalDigits,
allDigits,
}
void writeAligned(Writer, T1, T2, T3, Char)(auto ref Writer w,
T1 prefix, T2 grouped, T3 suffix, scope const ref FormatSpec!Char f,
bool integer_precision = false)
if (isSomeString!T1 && isSomeString!T2 && isSomeString!T3)
{
writeAligned(w, prefix, grouped, "", suffix, f,
integer_precision ? PrecisionType.integer : PrecisionType.none);
}
void writeAligned(Writer, T1, T2, T3, T4, Char)(auto ref Writer w,
T1 prefix, T2 grouped, T3 fracts, T4 suffix, scope const ref FormatSpec!Char f,
PrecisionType p = PrecisionType.none)
if (isSomeString!T1 && isSomeString!T2 && isSomeString!T3 && isSomeString!T4)
{
// writes: left padding, prefix, leading zeros, grouped, fracts, suffix, right padding
if (p == PrecisionType.integer && f.precision == f.UNSPECIFIED)
p = PrecisionType.none;
import std.range.primitives : put;
long prefixWidth;
long groupedWidth = grouped.length; // TODO: does not take graphemes into account
long fractsWidth = fracts.length; // TODO: does not take graphemes into account
long suffixWidth;
// TODO: remove this workaround which hides https://issues.dlang.org/show_bug.cgi?id=21815
if (f.width > 0)
{
prefixWidth = getWidth(prefix);
suffixWidth = getWidth(suffix);
}
auto doGrouping = f.flSeparator && groupedWidth > 0
&& f.separators > 0 && f.separators != f.UNSPECIFIED;
// front = number of symbols left of the leftmost separator
long front = doGrouping ? (groupedWidth - 1) % f.separators + 1 : 0;
// sepCount = number of separators to be inserted
long sepCount = doGrouping ? (groupedWidth - 1) / f.separators : 0;
long trailingZeros = 0;
if (p == PrecisionType.fractionalDigits)
trailingZeros = f.precision - (fractsWidth - 1);
if (p == PrecisionType.allDigits && f.flHash)
{
if (grouped != "0")
trailingZeros = f.precision - (fractsWidth - 1) - groupedWidth;
else
{
trailingZeros = f.precision - fractsWidth;
foreach (i;0 .. fracts.length)
if (fracts[i] != '0' && fracts[i] != '.')
{
trailingZeros = f.precision - (fracts.length - i);
break;
}
}
}
auto nodot = fracts == "." && trailingZeros == 0 && !f.flHash;
if (nodot) fractsWidth = 0;
long width = prefixWidth + sepCount + groupedWidth + fractsWidth + trailingZeros + suffixWidth;
long delta = f.width - width;
// with integers, precision is considered the minimum number of digits;
// if digits are missing, we have to recalculate everything
long pregrouped = 0;
if (p == PrecisionType.integer && groupedWidth < f.precision)
{
pregrouped = f.precision - groupedWidth;
delta -= pregrouped;
if (doGrouping)
{
front = ((front - 1) + pregrouped) % f.separators + 1;
delta -= (f.precision - 1) / f.separators - sepCount;
}
}
// left padding
if ((!f.flZero || p == PrecisionType.integer) && delta > 0)
{
if (f.flEqual)
{
foreach (i ; 0 .. delta / 2 + ((delta % 2 == 1 && !f.flDash) ? 1 : 0))
put(w, ' ');
}
else if (!f.flDash)
{
foreach (i ; 0 .. delta)
put(w, ' ');
}
}
// prefix
put(w, prefix);
// leading grouped zeros
if (f.flZero && p != PrecisionType.integer && !f.flDash && delta > 0)
{
if (doGrouping)
{
// front2 and sepCount2 are the same as above for the leading zeros
long front2 = (delta + front - 1) % (f.separators + 1) + 1;
long sepCount2 = (delta + front - 1) / (f.separators + 1);
delta -= sepCount2;
// according to POSIX: if the first symbol is a separator,
// an additional zero is put left of it, even if that means, that
// the total width is one more then specified
if (front2 > f.separators) { front2 = 1; }
foreach (i ; 0 .. delta)
{
if (front2 == 0)
{
put(w, f.separatorChar);
front2 = f.separators;
}
front2--;
put(w, '0');
}
// separator between zeros and grouped
if (front == f.separators)
put(w, f.separatorChar);
}
else
foreach (i ; 0 .. delta)
put(w, '0');
}
// grouped content
if (doGrouping)
{
// TODO: this does not take graphemes into account
foreach (i;0 .. pregrouped + grouped.length)
{
if (front == 0)
{
put(w, f.separatorChar);
front = f.separators;
}
front--;
put(w, i < pregrouped ? '0' : grouped[cast(size_t) (i - pregrouped)]);
}
}
else
{
foreach (i;0 .. pregrouped)
put(w, '0');
put(w, grouped);
}
// fracts
if (!nodot)
put(w, fracts);
// trailing zeros
foreach (i ; 0 .. trailingZeros)
put(w, '0');
// suffix
put(w, suffix);
// right padding
if (delta > 0)
{
if (f.flEqual)
{
foreach (i ; 0 .. delta / 2 + ((delta % 2 == 1 && f.flDash) ? 1 : 0))
put(w, ' ');
}
else if (f.flDash)
{
foreach (i ; 0 .. delta)
put(w, ' ');
}
}
}
@safe pure unittest
{
import std.array : appender;
import std.format : singleSpec;
auto w = appender!string();
auto spec = singleSpec("%s");
writeAligned(w, "pre", "grouping", "suf", spec);
assert(w.data == "pregroupingsuf", w.data);
w = appender!string();
spec = singleSpec("%20s");
writeAligned(w, "pre", "grouping", "suf", spec);
assert(w.data == " pregroupingsuf", w.data);
w = appender!string();
spec = singleSpec("%-20s");
writeAligned(w, "pre", "grouping", "suf", spec);
assert(w.data == "pregroupingsuf ", w.data);
w = appender!string();
spec = singleSpec("%020s");
writeAligned(w, "pre", "grouping", "suf", spec);
assert(w.data == "pre000000groupingsuf", w.data);
w = appender!string();
spec = singleSpec("%-020s");
writeAligned(w, "pre", "grouping", "suf", spec);
assert(w.data == "pregroupingsuf ", w.data);
w = appender!string();
spec = singleSpec("%20,1s");
writeAligned(w, "pre", "grouping", "suf", spec);
assert(w.data == "preg,r,o,u,p,i,n,gsuf", w.data);
w = appender!string();
spec = singleSpec("%20,2s");
writeAligned(w, "pre", "grouping", "suf", spec);
assert(w.data == " pregr,ou,pi,ngsuf", w.data);
w = appender!string();
spec = singleSpec("%20,3s");
writeAligned(w, "pre", "grouping", "suf", spec);
assert(w.data == " pregr,oup,ingsuf", w.data);
w = appender!string();
spec = singleSpec("%20,10s");
writeAligned(w, "pre", "grouping", "suf", spec);
assert(w.data == " pregroupingsuf", w.data);
w = appender!string();
spec = singleSpec("%020,1s");
writeAligned(w, "pre", "grouping", "suf", spec);
assert(w.data == "preg,r,o,u,p,i,n,gsuf", w.data);
w = appender!string();
spec = singleSpec("%020,2s");
writeAligned(w, "pre", "grouping", "suf", spec);
assert(w.data == "pre00,gr,ou,pi,ngsuf", w.data);
w = appender!string();
spec = singleSpec("%020,3s");
writeAligned(w, "pre", "grouping", "suf", spec);
assert(w.data == "pre00,0gr,oup,ingsuf", w.data);
w = appender!string();
spec = singleSpec("%020,10s");
writeAligned(w, "pre", "grouping", "suf", spec);
assert(w.data == "pre000,00groupingsuf", w.data);
w = appender!string();
spec = singleSpec("%021,3s");
writeAligned(w, "pre", "grouping", "suf", spec);
assert(w.data == "pre000,0gr,oup,ingsuf", w.data);
// According to https://github.com/dlang/phobos/pull/7112 this
// is defined by POSIX standard:
w = appender!string();
spec = singleSpec("%022,3s");
writeAligned(w, "pre", "grouping", "suf", spec);
assert(w.data == "pre0,000,0gr,oup,ingsuf", w.data);
w = appender!string();
spec = singleSpec("%023,3s");
writeAligned(w, "pre", "grouping", "suf", spec);
assert(w.data == "pre0,000,0gr,oup,ingsuf", w.data);
w = appender!string();
spec = singleSpec("%,3s");
writeAligned(w, "pre", "grouping", "suf", spec);
assert(w.data == "pregr,oup,ingsuf", w.data);
}
@safe pure unittest
{
import std.array : appender;
import std.format : singleSpec;
auto w = appender!string();
auto spec = singleSpec("%.10s");
writeAligned(w, "pre", "grouping", "suf", spec, true);
assert(w.data == "pre00groupingsuf", w.data);
w = appender!string();
spec = singleSpec("%.10,3s");
writeAligned(w, "pre", "grouping", "suf", spec, true);
assert(w.data == "pre0,0gr,oup,ingsuf", w.data);
w = appender!string();
spec = singleSpec("%25.10,3s");
writeAligned(w, "pre", "grouping", "suf", spec, true);
assert(w.data == " pre0,0gr,oup,ingsuf", w.data);
// precision has precedence over zero flag
w = appender!string();
spec = singleSpec("%025.12,3s");
writeAligned(w, "pre", "grouping", "suf", spec, true);
assert(w.data == " pre000,0gr,oup,ingsuf", w.data);
w = appender!string();
spec = singleSpec("%025.13,3s");
writeAligned(w, "pre", "grouping", "suf", spec, true);
assert(w.data == " pre0,000,0gr,oup,ingsuf", w.data);
}
@safe unittest
{
assert(format("%,d", 1000) == "1,000");
assert(format("%,f", 1234567.891011) == "1,234,567.891011");
assert(format("%,?d", '?', 1000) == "1?000");
assert(format("%,1d", 1000) == "1,0,0,0", format("%,1d", 1000));
assert(format("%,*d", 4, -12345) == "-1,2345");
assert(format("%,*?d", 4, '_', -12345) == "-1_2345");
assert(format("%,6?d", '_', -12345678) == "-12_345678");
assert(format("%12,3.3f", 1234.5678) == " 1,234.568", "'" ~
format("%12,3.3f", 1234.5678) ~ "'");
}
private long getWidth(T)(T s)
{
import std.algorithm.searching : all;
import std.uni : graphemeStride;
// check for non-ascii character
if (s.all!(a => a <= 0x7F)) return s.length;
//TODO: optimize this
long width = 0;
for (size_t i; i < s.length; i += graphemeStride(s, i))
++width;
return width;
}
enum RoundingClass { ZERO, LOWER, FIVE, UPPER }
enum RoundingMode { up, down, toZero, toNearestTiesToEven, toNearestTiesAwayFromZero }
bool round(T)(ref T sequence, size_t left, size_t right, RoundingClass type, bool negative, char max = '9')
in (left >= 0) // should be left > 0, but if you know ahead, that there's no carry, left == 0 is fine
in (left < sequence.length)
in (right >= 0)
in (right <= sequence.length)
in (right >= left)
in (max == '9' || max == 'f' || max == 'F')
{
import std.math.hardware;
auto mode = RoundingMode.toNearestTiesToEven;
if (!__ctfe)
{
// std.math's FloatingPointControl isn't available on all target platforms
static if (is(FloatingPointControl))
{
switch (FloatingPointControl.rounding)
{
case FloatingPointControl.roundUp:
mode = RoundingMode.up;
break;
case FloatingPointControl.roundDown:
mode = RoundingMode.down;
break;
case FloatingPointControl.roundToZero:
mode = RoundingMode.toZero;
break;
case FloatingPointControl.roundToNearest:
mode = RoundingMode.toNearestTiesToEven;
break;
default: assert(false, "Unknown floating point rounding mode");
}
}
}
bool roundUp = false;
if (mode == RoundingMode.up)
roundUp = type != RoundingClass.ZERO && !negative;
else if (mode == RoundingMode.down)
roundUp = type != RoundingClass.ZERO && negative;
else if (mode == RoundingMode.toZero)
roundUp = false;
else
{
roundUp = type == RoundingClass.UPPER;
if (type == RoundingClass.FIVE)
{
// IEEE754 allows for two different ways of implementing roundToNearest:
if (mode == RoundingMode.toNearestTiesAwayFromZero)
roundUp = true;
else
{
// Round to nearest, ties to even
auto last = sequence[right - 1];
if (last == '.') last = sequence[right - 2];
roundUp = (last <= '9' && last % 2 != 0) || (last > '9' && last % 2 == 0);
}
}
}
if (!roundUp) return false;
foreach_reverse (i;left .. right)
{
if (sequence[i] == '.') continue;
if (sequence[i] == max)
sequence[i] = '0';
else
{
if (max != '9' && sequence[i] == '9')
sequence[i] = max == 'f' ? 'a' : 'A';
else
sequence[i]++;
return false;
}
}
sequence[left - 1] = '1';
return true;
}
@safe unittest
{
char[10] c;
size_t left = 5;
size_t right = 8;
c[4 .. 8] = "x.99";
assert(round(c, left, right, RoundingClass.UPPER, false) == true);
assert(c[4 .. 8] == "1.00");
c[4 .. 8] = "x.99";
assert(round(c, left, right, RoundingClass.FIVE, false) == true);
assert(c[4 .. 8] == "1.00");
c[4 .. 8] = "x.99";
assert(round(c, left, right, RoundingClass.LOWER, false) == false);
assert(c[4 .. 8] == "x.99");
c[4 .. 8] = "x.99";
assert(round(c, left, right, RoundingClass.ZERO, false) == false);
assert(c[4 .. 8] == "x.99");
import std.math.hardware;
static if (is(FloatingPointControl))
{
FloatingPointControl fpctrl;
fpctrl.rounding = FloatingPointControl.roundUp;
c[4 .. 8] = "x.99";
assert(round(c, left, right, RoundingClass.UPPER, false) == true);
assert(c[4 .. 8] == "1.00");
c[4 .. 8] = "x.99";
assert(round(c, left, right, RoundingClass.FIVE, false) == true);
assert(c[4 .. 8] == "1.00");
c[4 .. 8] = "x.99";
assert(round(c, left, right, RoundingClass.LOWER, false) == true);
assert(c[4 .. 8] == "1.00");
c[4 .. 8] = "x.99";
assert(round(c, left, right, RoundingClass.ZERO, false) == false);
assert(c[4 .. 8] == "x.99");
fpctrl.rounding = FloatingPointControl.roundDown;
c[4 .. 8] = "x.99";
assert(round(c, left, right, RoundingClass.UPPER, false) == false);
assert(c[4 .. 8] == "x.99");
c[4 .. 8] = "x.99";
assert(round(c, left, right, RoundingClass.FIVE, false) == false);
assert(c[4 .. 8] == "x.99");
c[4 .. 8] = "x.99";
assert(round(c, left, right, RoundingClass.LOWER, false) == false);
assert(c[4 .. 8] == "x.99");
c[4 .. 8] = "x.99";
assert(round(c, left, right, RoundingClass.ZERO, false) == false);
assert(c[4 .. 8] == "x.99");
fpctrl.rounding = FloatingPointControl.roundToZero;
c[4 .. 8] = "x.99";
assert(round(c, left, right, RoundingClass.UPPER, false) == false);
assert(c[4 .. 8] == "x.99");
c[4 .. 8] = "x.99";
assert(round(c, left, right, RoundingClass.FIVE, false) == false);
assert(c[4 .. 8] == "x.99");
c[4 .. 8] = "x.99";
assert(round(c, left, right, RoundingClass.LOWER, false) == false);
assert(c[4 .. 8] == "x.99");
c[4 .. 8] = "x.99";
assert(round(c, left, right, RoundingClass.ZERO, false) == false);
assert(c[4 .. 8] == "x.99");
}
}
@safe unittest
{
char[10] c;
size_t left = 5;
size_t right = 8;
c[4 .. 8] = "x8.5";
assert(round(c, left, right, RoundingClass.UPPER, true) == false);
assert(c[4 .. 8] == "x8.6");
c[4 .. 8] = "x8.5";
assert(round(c, left, right, RoundingClass.FIVE, true) == false);
assert(c[4 .. 8] == "x8.6");
c[4 .. 8] = "x8.4";
assert(round(c, left, right, RoundingClass.FIVE, true) == false);
assert(c[4 .. 8] == "x8.4");
c[4 .. 8] = "x8.5";
assert(round(c, left, right, RoundingClass.LOWER, true) == false);
assert(c[4 .. 8] == "x8.5");
c[4 .. 8] = "x8.5";
assert(round(c, left, right, RoundingClass.ZERO, true) == false);
assert(c[4 .. 8] == "x8.5");
import std.math.hardware;
static if (is(FloatingPointControl))
{
FloatingPointControl fpctrl;
fpctrl.rounding = FloatingPointControl.roundUp;
c[4 .. 8] = "x8.5";
assert(round(c, left, right, RoundingClass.UPPER, true) == false);
assert(c[4 .. 8] == "x8.5");
c[4 .. 8] = "x8.5";
assert(round(c, left, right, RoundingClass.FIVE, true) == false);
assert(c[4 .. 8] == "x8.5");
c[4 .. 8] = "x8.5";
assert(round(c, left, right, RoundingClass.LOWER, true) == false);
assert(c[4 .. 8] == "x8.5");
c[4 .. 8] = "x8.5";
assert(round(c, left, right, RoundingClass.ZERO, true) == false);
assert(c[4 .. 8] == "x8.5");
fpctrl.rounding = FloatingPointControl.roundDown;
c[4 .. 8] = "x8.5";
assert(round(c, left, right, RoundingClass.UPPER, true) == false);
assert(c[4 .. 8] == "x8.6");
c[4 .. 8] = "x8.5";
assert(round(c, left, right, RoundingClass.FIVE, true) == false);
assert(c[4 .. 8] == "x8.6");
c[4 .. 8] = "x8.5";
assert(round(c, left, right, RoundingClass.LOWER, true) == false);
assert(c[4 .. 8] == "x8.6");
c[4 .. 8] = "x8.5";
assert(round(c, left, right, RoundingClass.ZERO, true) == false);
assert(c[4 .. 8] == "x8.5");
fpctrl.rounding = FloatingPointControl.roundToZero;
c[4 .. 8] = "x8.5";
assert(round(c, left, right, RoundingClass.UPPER, true) == false);
assert(c[4 .. 8] == "x8.5");
c[4 .. 8] = "x8.5";
assert(round(c, left, right, RoundingClass.FIVE, true) == false);
assert(c[4 .. 8] == "x8.5");
c[4 .. 8] = "x8.5";
assert(round(c, left, right, RoundingClass.LOWER, true) == false);
assert(c[4 .. 8] == "x8.5");
c[4 .. 8] = "x8.5";
assert(round(c, left, right, RoundingClass.ZERO, true) == false);
assert(c[4 .. 8] == "x8.5");
}
}
@safe unittest
{
char[10] c;
size_t left = 5;
size_t right = 8;
c[4 .. 8] = "x8.9";
assert(round(c, left, right, RoundingClass.UPPER, true, 'f') == false);
assert(c[4 .. 8] == "x8.a");
c[4 .. 8] = "x8.9";
assert(round(c, left, right, RoundingClass.UPPER, true, 'F') == false);
assert(c[4 .. 8] == "x8.A");
c[4 .. 8] = "x8.f";
assert(round(c, left, right, RoundingClass.UPPER, true, 'f') == false);
assert(c[4 .. 8] == "x9.0");
}
version (StdUnittest)
private void formatTest(T)(T val, string expected, size_t ln = __LINE__, string fn = __FILE__)
{
formatTest(val, [expected], ln, fn);
}
version (StdUnittest)
private void formatTest(T)(string fmt, T val, string expected, size_t ln = __LINE__, string fn = __FILE__) @safe
{
formatTest(fmt, val, [expected], ln, fn);
}
version (StdUnittest)
private void formatTest(T)(T val, string[] expected, size_t ln = __LINE__, string fn = __FILE__)
{
import core.exception : AssertError;
import std.algorithm.searching : canFind;
import std.array : appender;
import std.conv : text;
import std.exception : enforce;
import std.format.write : formatValue;
FormatSpec!char f;
auto w = appender!string();
formatValue(w, val, f);
enforce!AssertError(expected.canFind(w.data),
text("expected one of `", expected, "`, result = `", w.data, "`"), fn, ln);
}
version (StdUnittest)
private void formatTest(T)(string fmt, T val, string[] expected, size_t ln = __LINE__, string fn = __FILE__) @safe
{
import core.exception : AssertError;
import std.algorithm.searching : canFind;
import std.array : appender;
import std.conv : text;
import std.exception : enforce;
import std.format.write : formattedWrite;
auto w = appender!string();
formattedWrite(w, fmt, val);
enforce!AssertError(expected.canFind(w.data),
text("expected one of `", expected, "`, result = `", w.data, "`"), fn, ln);
}