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/* JSON trees
Copyright (C) 2017-2020 Free Software Foundation, Inc.
Contributed by David Malcolm <dmalcolm@redhat.com>.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "json.h"
#include "pretty-print.h"
#include "math.h"
#include "selftest.h"
using namespace json;
/* class json::value. */
/* Dump this json::value tree to OUTF.
No formatting is done. There are no guarantees about the order
in which the key/value pairs of json::objects are printed. */
void
value::dump (FILE *outf) const
{
pretty_printer pp;
pp_buffer (&pp)->stream = outf;
print (&pp);
pp_flush (&pp);
}
/* class json::object, a subclass of json::value, representing
an unordered collection of key/value pairs. */
/* json:object's dtor. */
object::~object ()
{
for (map_t::iterator it = m_map.begin (); it != m_map.end (); ++it)
{
free (const_cast <char *>((*it).first));
delete ((*it).second);
}
}
/* Implementation of json::value::print for json::object. */
void
object::print (pretty_printer *pp) const
{
/* Note that the order is not guaranteed. */
pp_character (pp, '{');
for (map_t::iterator it = m_map.begin (); it != m_map.end (); ++it)
{
if (it != m_map.begin ())
pp_string (pp, ", ");
const char *key = const_cast <char *>((*it).first);
value *value = (*it).second;
pp_printf (pp, "\"%s\": ", key); // FIXME: escaping?
value->print (pp);
}
pp_character (pp, '}');
}
/* Set the json::value * for KEY, taking ownership of V
(and taking a copy of KEY if necessary). */
void
object::set (const char *key, value *v)
{
gcc_assert (key);
gcc_assert (v);
value **ptr = m_map.get (key);
if (ptr)
{
/* If the key is already present, delete the existing value
and overwrite it. */
delete *ptr;
*ptr = v;
}
else
/* If the key wasn't already present, take a copy of the key,
and store the value. */
m_map.put (xstrdup (key), v);
}
/* Get the json::value * for KEY.
The object retains ownership of the value. */
value *
object::get (const char *key) const
{
gcc_assert (key);
value **ptr = const_cast <map_t &> (m_map).get (key);
if (ptr)
return *ptr;
else
return NULL;
}
/* class json::array, a subclass of json::value, representing
an ordered collection of values. */
/* json::array's dtor. */
array::~array ()
{
unsigned i;
value *v;
FOR_EACH_VEC_ELT (m_elements, i, v)
delete v;
}
/* Implementation of json::value::print for json::array. */
void
array::print (pretty_printer *pp) const
{
pp_character (pp, '[');
unsigned i;
value *v;
FOR_EACH_VEC_ELT (m_elements, i, v)
{
if (i)
pp_string (pp, ", ");
v->print (pp);
}
pp_character (pp, ']');
}
/* Append non-NULL value V to a json::array, taking ownership of V. */
void
array::append (value *v)
{
gcc_assert (v);
m_elements.safe_push (v);
}
/* class json::float_number, a subclass of json::value, wrapping a double. */
/* Implementation of json::value::print for json::float_number. */
void
float_number::print (pretty_printer *pp) const
{
char tmp[1024];
snprintf (tmp, sizeof (tmp), "%g", m_value);
pp_string (pp, tmp);
}
/* class json::integer_number, a subclass of json::value, wrapping a long. */
/* Implementation of json::value::print for json::integer_number. */
void
integer_number::print (pretty_printer *pp) const
{
char tmp[1024];
snprintf (tmp, sizeof (tmp), "%ld", m_value);
pp_string (pp, tmp);
}
/* class json::string, a subclass of json::value. */
/* json::string's ctor. */
string::string (const char *utf8)
{
gcc_assert (utf8);
m_utf8 = xstrdup (utf8);
}
/* Implementation of json::value::print for json::string. */
void
string::print (pretty_printer *pp) const
{
pp_character (pp, '"');
for (const char *ptr = m_utf8; *ptr; ptr++)
{
char ch = *ptr;
switch (ch)
{
case '"':
pp_string (pp, "\\\"");
break;
case '\\':
pp_string (pp, "\\n");
break;
case '\b':
pp_string (pp, "\\b");
break;
case '\f':
pp_string (pp, "\\f");
break;
case '\n':
pp_string (pp, "\\n");
break;
case '\r':
pp_string (pp, "\\r");
break;
case '\t':
pp_string (pp, "\\t");
break;
default:
pp_character (pp, ch);
}
}
pp_character (pp, '"');
}
/* class json::literal, a subclass of json::value. */
/* Implementation of json::value::print for json::literal. */
void
literal::print (pretty_printer *pp) const
{
switch (m_kind)
{
case JSON_TRUE:
pp_string (pp, "true");
break;
case JSON_FALSE:
pp_string (pp, "false");
break;
case JSON_NULL:
pp_string (pp, "null");
break;
default:
gcc_unreachable ();
}
}
#if CHECKING_P
namespace selftest {
/* Selftests. */
/* Verify that JV->print () prints EXPECTED_JSON. */
static void
assert_print_eq (const json::value &jv, const char *expected_json)
{
pretty_printer pp;
jv.print (&pp);
ASSERT_STREQ (expected_json, pp_formatted_text (&pp));
}
/* Verify that object::get works as expected. */
static void
test_object_get ()
{
object obj;
value *val = new json::string ("value");
obj.set ("foo", val);
ASSERT_EQ (obj.get ("foo"), val);
ASSERT_EQ (obj.get ("not-present"), NULL);
}
/* Verify that JSON objects are written correctly. We can't test more than
one key/value pair, as we don't impose a guaranteed ordering. */
static void
test_writing_objects ()
{
object obj;
obj.set ("foo", new json::string ("bar"));
assert_print_eq (obj, "{\"foo\": \"bar\"}");
}
/* Verify that JSON arrays are written correctly. */
static void
test_writing_arrays ()
{
array arr;
assert_print_eq (arr, "[]");
arr.append (new json::string ("foo"));
assert_print_eq (arr, "[\"foo\"]");
arr.append (new json::string ("bar"));
assert_print_eq (arr, "[\"foo\", \"bar\"]");
}
/* Verify that JSON numbers are written correctly. */
static void
test_writing_float_numbers ()
{
assert_print_eq (float_number (0), "0");
assert_print_eq (float_number (42), "42");
assert_print_eq (float_number (-100), "-100");
assert_print_eq (float_number (123456789), "1.23457e+08");
}
static void
test_writing_integer_numbers ()
{
assert_print_eq (integer_number (0), "0");
assert_print_eq (integer_number (42), "42");
assert_print_eq (integer_number (-100), "-100");
assert_print_eq (integer_number (123456789), "123456789");
assert_print_eq (integer_number (-123456789), "-123456789");
}
/* Verify that JSON strings are written correctly. */
static void
test_writing_strings ()
{
string foo ("foo");
assert_print_eq (foo, "\"foo\"");
string contains_quotes ("before \"quoted\" after");
assert_print_eq (contains_quotes, "\"before \\\"quoted\\\" after\"");
}
/* Verify that JSON literals are written correctly. */
static void
test_writing_literals ()
{
assert_print_eq (literal (JSON_TRUE), "true");
assert_print_eq (literal (JSON_FALSE), "false");
assert_print_eq (literal (JSON_NULL), "null");
assert_print_eq (literal (true), "true");
assert_print_eq (literal (false), "false");
}
/* Run all of the selftests within this file. */
void
json_cc_tests ()
{
test_object_get ();
test_writing_objects ();
test_writing_arrays ();
test_writing_float_numbers ();
test_writing_integer_numbers ();
test_writing_strings ();
test_writing_literals ();
}
} // namespace selftest
#endif /* #if CHECKING_P */