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Very low footprint JSON parser written in portable ANSI C
C C++ Python
Branch: master

Merge pull request #48 from pasqumirk/master

Added test program for C library
latest commit c8f0af9b22
@udp authored

README.md

Very low footprint JSON parser written in portable ANSI C.

  • BSD licensed with no dependencies (i.e. just drop the C file into your project)
  • Never recurses or allocates more memory than it needs
  • Very simple API with operator sugar for C++

Build Status

Want to serialize? Check out json-builder!

Installing

There is now a makefile which will produce a libjsonparser static and dynamic library. However, this is not required to build json-parser, and the source files (json.c and json.h) should be happy in any build system you already have in place.

API

json_value * json_parse (const json_char * json,
                         size_t length);

json_value * json_parse_ex (json_settings * settings,
                            const json_char * json,
                            size_t length,
                            char * error);

void json_value_free (json_value *);

The type field of json_value is one of:

  • json_object (see u.object.length, u.object.values[x].name, u.object.values[x].value)
  • json_array (see u.array.length, u.array.values)
  • json_integer (see u.integer)
  • json_double (see u.dbl)
  • json_string (see u.string.ptr, u.string.length)
  • json_boolean (see u.boolean)
  • json_null

Compile-Time Options

-DJSON_TRACK_SOURCE

Stores the source location (line and column number) inside each json_value.

This is useful for application-level error reporting.

Runtime Options

settings |= json_enable_comments;

Enables C-style // line and /* block */ comments.

size_t value_extra

The amount of space (if any) to allocate at the end of each json_value, in order to give the application space to add metadata.

void * (* mem_alloc) (size_t, int zero, void * user_data);
void (* mem_free) (void *, void * user_data);

Custom allocator routines. If NULL, the default malloc and free will be used.

The user_data pointer will be forwarded from json_settings to allow application context to be passed.

Changes in version 1.1.0

  • UTF-8 byte order marks are now skipped if present

  • Allows cross-compilation by honoring --host if given (@wkz)

  • Maximum size for error buffer is now exposed in header (@LB--)

  • GCC warning for static after const fixed (@batrick)

  • Optional support for C-style line and block comments added (@Jin-W-FS)

  • name_length field added to object values

  • It is now possible to retrieve the source line/column number of a parsed json_value when JSON_TRACK_SOURCE is enabled

  • The application may now extend json_value using the value_extra setting

  • Un-ambiguate pow call in the case of C++ overloaded pow (@fcartegnie)

  • Fix null pointer de-reference when a non-existing array is closed and no root value is present

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