879 lines
20 KiB
C
879 lines
20 KiB
C
/*
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* Copyright (c) 2009, 2010 Petri Lehtinen <petri@digip.org>
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*
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* Jansson is free software; you can redistribute it and/or modify
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* it under the terms of the MIT license. See LICENSE for details.
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*/
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#define _GNU_SOURCE
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#include <ctype.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdarg.h>
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#include <assert.h>
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#include <jansson.h>
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#include "jansson_private.h"
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#include "strbuffer.h"
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#include "utf.h"
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#define TOKEN_INVALID -1
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#define TOKEN_EOF 0
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#define TOKEN_STRING 256
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#define TOKEN_INTEGER 257
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#define TOKEN_REAL 258
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#define TOKEN_TRUE 259
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#define TOKEN_FALSE 260
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#define TOKEN_NULL 261
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/* read one byte from stream, return EOF on end of file */
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typedef int (*get_func)(void *data);
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/* return non-zero if end of file has been reached */
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typedef int (*eof_func)(void *data);
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typedef struct {
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get_func get;
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eof_func eof;
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void *data;
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int stream_pos;
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char buffer[5];
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int buffer_pos;
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} stream_t;
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typedef struct {
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stream_t stream;
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strbuffer_t saved_text;
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int token;
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int line, column;
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union {
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char *string;
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int integer;
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double real;
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} value;
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} lex_t;
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/*** error reporting ***/
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static void error_init(json_error_t *error)
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{
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if(error)
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{
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error->text[0] = '\0';
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error->line = -1;
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}
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}
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static void error_set(json_error_t *error, const lex_t *lex,
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const char *msg, ...)
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{
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va_list ap;
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char text[JSON_ERROR_TEXT_LENGTH];
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if(!error || error->text[0] != '\0') {
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/* error already set */
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return;
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}
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va_start(ap, msg);
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vsnprintf(text, JSON_ERROR_TEXT_LENGTH, msg, ap);
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va_end(ap);
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if(lex)
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{
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const char *saved_text = strbuffer_value(&lex->saved_text);
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error->line = lex->line;
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if(saved_text && saved_text[0])
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{
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if(lex->saved_text.length <= 20) {
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snprintf(error->text, JSON_ERROR_TEXT_LENGTH,
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"%s near '%s'", text, saved_text);
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}
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else
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snprintf(error->text, JSON_ERROR_TEXT_LENGTH, "%s", text);
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}
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else
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{
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snprintf(error->text, JSON_ERROR_TEXT_LENGTH,
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"%s near end of file", text);
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}
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}
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else
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{
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error->line = -1;
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snprintf(error->text, JSON_ERROR_TEXT_LENGTH, "%s", text);
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}
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}
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/*** lexical analyzer ***/
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static void
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stream_init(stream_t *stream, get_func get, eof_func eof, void *data)
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{
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stream->get = get;
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stream->eof = eof;
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stream->data = data;
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stream->stream_pos = 0;
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stream->buffer[0] = '\0';
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stream->buffer_pos = 0;
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}
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static char stream_get(stream_t *stream, json_error_t *error)
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{
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char c;
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if(!stream->buffer[stream->buffer_pos])
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{
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stream->buffer[0] = stream->get(stream->data);
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stream->buffer_pos = 0;
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c = stream->buffer[0];
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if((unsigned char)c >= 0x80 && c != (char)EOF)
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{
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/* multi-byte UTF-8 sequence */
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int i, count;
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count = utf8_check_first(c);
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if(!count)
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goto out;
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assert(count >= 2);
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for(i = 1; i < count; i++)
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stream->buffer[i] = stream->get(stream->data);
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if(!utf8_check_full(stream->buffer, count, NULL))
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goto out;
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stream->stream_pos += count;
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stream->buffer[count] = '\0';
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}
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else {
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stream->buffer[1] = '\0';
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stream->stream_pos++;
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}
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}
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return stream->buffer[stream->buffer_pos++];
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out:
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error_set(error, NULL, "unable to decode byte 0x%x at position %d",
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(unsigned char)c, stream->stream_pos);
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stream->buffer[0] = EOF;
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stream->buffer[1] = '\0';
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stream->buffer_pos = 1;
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return EOF;
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}
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static void stream_unget(stream_t *stream, char c)
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{
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assert(stream->buffer_pos > 0);
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stream->buffer_pos--;
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assert(stream->buffer[stream->buffer_pos] == c);
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}
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static int lex_get(lex_t *lex, json_error_t *error)
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{
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return stream_get(&lex->stream, error);
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}
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static int lex_eof(lex_t *lex)
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{
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return lex->stream.eof(lex->stream.data);
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}
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static void lex_save(lex_t *lex, char c)
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{
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strbuffer_append_byte(&lex->saved_text, c);
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}
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static int lex_get_save(lex_t *lex, json_error_t *error)
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{
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char c = stream_get(&lex->stream, error);
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lex_save(lex, c);
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return c;
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}
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static void lex_unget_unsave(lex_t *lex, char c)
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{
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char d;
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stream_unget(&lex->stream, c);
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d = strbuffer_pop(&lex->saved_text);
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assert(c == d);
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}
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static void lex_save_cached(lex_t *lex)
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{
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while(lex->stream.buffer[lex->stream.buffer_pos] != '\0')
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{
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lex_save(lex, lex->stream.buffer[lex->stream.buffer_pos]);
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lex->stream.buffer_pos++;
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}
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}
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/* assumes that str points to 'u' plus at least 4 valid hex digits */
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static int32_t decode_unicode_escape(const char *str)
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{
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int i;
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int32_t value = 0;
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assert(str[0] == 'u');
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for(i = 1; i <= 4; i++) {
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char c = str[i];
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value <<= 4;
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if(isdigit(c))
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value += c - '0';
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else if(islower(c))
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value += c - 'a' + 10;
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else if(isupper(c))
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value += c - 'A' + 10;
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else
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assert(0);
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}
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return value;
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}
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static void lex_scan_string(lex_t *lex, json_error_t *error)
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{
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char c;
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const char *p;
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char *t;
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int i;
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lex->value.string = NULL;
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lex->token = TOKEN_INVALID;
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c = lex_get_save(lex, error);
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while(c != '"') {
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if(c == (char)EOF) {
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lex_unget_unsave(lex, c);
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if(lex_eof(lex))
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error_set(error, lex, "premature end of input");
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goto out;
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}
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else if((unsigned char)c <= 0x1F) {
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/* control character */
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lex_unget_unsave(lex, c);
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if(c == '\n')
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error_set(error, lex, "unexpected newline", c);
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else
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error_set(error, lex, "control character 0x%x", c);
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goto out;
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}
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else if(c == '\\') {
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c = lex_get_save(lex, error);
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if(c == 'u') {
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c = lex_get_save(lex, error);
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for(i = 0; i < 4; i++) {
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if(!isxdigit(c)) {
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lex_unget_unsave(lex, c);
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error_set(error, lex, "invalid escape");
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goto out;
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}
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c = lex_get_save(lex, error);
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}
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}
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else if(c == '"' || c == '\\' || c == '/' || c == 'b' ||
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c == 'f' || c == 'n' || c == 'r' || c == 't')
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c = lex_get_save(lex, error);
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else {
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lex_unget_unsave(lex, c);
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error_set(error, lex, "invalid escape");
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goto out;
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}
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}
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else
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c = lex_get_save(lex, error);
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}
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/* the actual value is at most of the same length as the source
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string, because:
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- shortcut escapes (e.g. "\t") (length 2) are converted to 1 byte
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- a single \uXXXX escape (length 6) is converted to at most 3 bytes
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- two \uXXXX escapes (length 12) forming an UTF-16 surrogate pair
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are converted to 4 bytes
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*/
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lex->value.string = malloc(lex->saved_text.length + 1);
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if(!lex->value.string) {
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/* this is not very nice, since TOKEN_INVALID is returned */
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goto out;
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}
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/* the target */
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t = lex->value.string;
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/* + 1 to skip the " */
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p = strbuffer_value(&lex->saved_text) + 1;
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while(*p != '"') {
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if(*p == '\\') {
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p++;
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if(*p == 'u') {
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char buffer[4];
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int length;
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int32_t value;
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value = decode_unicode_escape(p);
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p += 5;
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if(0xD800 <= value && value <= 0xDBFF) {
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/* surrogate pair */
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if(*p == '\\' && *(p + 1) == 'u') {
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int32_t value2 = decode_unicode_escape(++p);
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p += 5;
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if(0xDC00 <= value2 && value2 <= 0xDFFF) {
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/* valid second surrogate */
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value =
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((value - 0xD800) << 10) +
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(value2 - 0xDC00) +
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0x10000;
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}
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else {
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/* invalid second surrogate */
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error_set(error, lex,
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"invalid Unicode '\\u%04X\\u%04X'",
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value, value2);
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goto out;
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}
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}
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else {
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/* no second surrogate */
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error_set(error, lex, "invalid Unicode '\\u%04X'",
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value);
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goto out;
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}
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}
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else if(0xDC00 <= value && value <= 0xDFFF) {
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error_set(error, lex, "invalid Unicode '\\u%04X'", value);
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goto out;
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}
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else if(value == 0)
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{
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error_set(error, lex, "\\u0000 is not allowed");
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goto out;
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}
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if(utf8_encode(value, buffer, &length))
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assert(0);
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memcpy(t, buffer, length);
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t += length;
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}
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else {
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switch(*p) {
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case '"': case '\\': case '/':
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*t = *p; break;
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case 'b': *t = '\b'; break;
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case 'f': *t = '\f'; break;
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case 'n': *t = '\n'; break;
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case 'r': *t = '\r'; break;
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case 't': *t = '\t'; break;
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default: assert(0);
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}
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t++;
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p++;
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}
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}
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else
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*(t++) = *(p++);
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}
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*t = '\0';
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lex->token = TOKEN_STRING;
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return;
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out:
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free(lex->value.string);
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}
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static int lex_scan_number(lex_t *lex, char c, json_error_t *error)
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{
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const char *saved_text;
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char *end;
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double value;
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lex->token = TOKEN_INVALID;
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if(c == '-')
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c = lex_get_save(lex, error);
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if(c == '0') {
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c = lex_get_save(lex, error);
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if(isdigit(c)) {
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lex_unget_unsave(lex, c);
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goto out;
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}
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}
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else if(isdigit(c)) {
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c = lex_get_save(lex, error);
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while(isdigit(c))
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c = lex_get_save(lex, error);
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}
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else {
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lex_unget_unsave(lex, c);
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goto out;
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}
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if(c != '.' && c != 'E' && c != 'e') {
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long value;
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lex_unget_unsave(lex, c);
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saved_text = strbuffer_value(&lex->saved_text);
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value = strtol(saved_text, &end, 10);
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assert(end == saved_text + lex->saved_text.length);
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if((value == LONG_MAX && errno == ERANGE) || value > INT_MAX) {
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error_set(error, lex, "too big integer");
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goto out;
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}
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else if((value == LONG_MIN && errno == ERANGE) || value < INT_MIN) {
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error_set(error, lex, "too big negative integer");
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goto out;
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}
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lex->token = TOKEN_INTEGER;
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lex->value.integer = (int)value;
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return 0;
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}
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if(c == '.') {
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c = lex_get(lex, error);
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if(!isdigit(c))
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goto out;
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lex_save(lex, c);
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c = lex_get_save(lex, error);
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while(isdigit(c))
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c = lex_get_save(lex, error);
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}
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if(c == 'E' || c == 'e') {
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c = lex_get_save(lex, error);
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if(c == '+' || c == '-')
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c = lex_get_save(lex, error);
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if(!isdigit(c)) {
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lex_unget_unsave(lex, c);
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goto out;
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}
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c = lex_get_save(lex, error);
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while(isdigit(c))
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c = lex_get_save(lex, error);
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}
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lex_unget_unsave(lex, c);
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saved_text = strbuffer_value(&lex->saved_text);
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value = strtod(saved_text, &end);
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assert(end == saved_text + lex->saved_text.length);
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if(errno == ERANGE && value != 0) {
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error_set(error, lex, "real number overflow");
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goto out;
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}
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lex->token = TOKEN_REAL;
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lex->value.real = value;
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return 0;
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out:
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return -1;
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}
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static int lex_scan(lex_t *lex, json_error_t *error)
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{
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char c;
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strbuffer_clear(&lex->saved_text);
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if(lex->token == TOKEN_STRING) {
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free(lex->value.string);
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lex->value.string = NULL;
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}
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c = lex_get(lex, error);
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while(c == ' ' || c == '\t' || c == '\n' || c == '\r')
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{
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if(c == '\n')
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lex->line++;
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c = lex_get(lex, error);
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}
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if(c == (char)EOF) {
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if(lex_eof(lex))
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lex->token = TOKEN_EOF;
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else
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lex->token = TOKEN_INVALID;
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goto out;
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}
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lex_save(lex, c);
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if(c == '{' || c == '}' || c == '[' || c == ']' || c == ':' || c == ',')
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lex->token = c;
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else if(c == '"')
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lex_scan_string(lex, error);
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else if(isdigit(c) || c == '-') {
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if(lex_scan_number(lex, c, error))
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goto out;
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}
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else if(isupper(c) || islower(c)) {
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/* eat up the whole identifier for clearer error messages */
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const char *saved_text;
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c = lex_get_save(lex, error);
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while(isupper(c) || islower(c))
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c = lex_get_save(lex, error);
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lex_unget_unsave(lex, c);
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saved_text = strbuffer_value(&lex->saved_text);
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if(strcmp(saved_text, "true") == 0)
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lex->token = TOKEN_TRUE;
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else if(strcmp(saved_text, "false") == 0)
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lex->token = TOKEN_FALSE;
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else if(strcmp(saved_text, "null") == 0)
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lex->token = TOKEN_NULL;
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else
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lex->token = TOKEN_INVALID;
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}
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else {
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/* save the rest of the input UTF-8 sequence to get an error
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message of valid UTF-8 */
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lex_save_cached(lex);
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lex->token = TOKEN_INVALID;
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}
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out:
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return lex->token;
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}
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static char *lex_steal_string(lex_t *lex)
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{
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char *result = NULL;
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if(lex->token == TOKEN_STRING)
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{
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result = lex->value.string;
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lex->value.string = NULL;
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}
|
|
return result;
|
|
}
|
|
|
|
static int lex_init(lex_t *lex, get_func get, eof_func eof, void *data)
|
|
{
|
|
stream_init(&lex->stream, get, eof, data);
|
|
if(strbuffer_init(&lex->saved_text))
|
|
return -1;
|
|
|
|
lex->token = TOKEN_INVALID;
|
|
lex->line = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void lex_close(lex_t *lex)
|
|
{
|
|
if(lex->token == TOKEN_STRING)
|
|
free(lex->value.string);
|
|
strbuffer_close(&lex->saved_text);
|
|
}
|
|
|
|
|
|
/*** parser ***/
|
|
|
|
static json_t *parse_value(lex_t *lex, json_error_t *error);
|
|
|
|
static json_t *parse_object(lex_t *lex, json_error_t *error)
|
|
{
|
|
json_t *object = json_object();
|
|
if(!object)
|
|
return NULL;
|
|
|
|
lex_scan(lex, error);
|
|
if(lex->token == '}')
|
|
return object;
|
|
|
|
while(1) {
|
|
char *key;
|
|
json_t *value;
|
|
|
|
if(lex->token != TOKEN_STRING) {
|
|
error_set(error, lex, "string or '}' expected");
|
|
goto error;
|
|
}
|
|
|
|
key = lex_steal_string(lex);
|
|
if(!key)
|
|
return NULL;
|
|
|
|
lex_scan(lex, error);
|
|
if(lex->token != ':') {
|
|
free(key);
|
|
error_set(error, lex, "':' expected");
|
|
goto error;
|
|
}
|
|
|
|
lex_scan(lex, error);
|
|
value = parse_value(lex, error);
|
|
if(!value) {
|
|
free(key);
|
|
goto error;
|
|
}
|
|
|
|
if(json_object_set_nocheck(object, key, value)) {
|
|
free(key);
|
|
json_decref(value);
|
|
goto error;
|
|
}
|
|
|
|
json_decref(value);
|
|
free(key);
|
|
|
|
lex_scan(lex, error);
|
|
if(lex->token != ',')
|
|
break;
|
|
|
|
lex_scan(lex, error);
|
|
}
|
|
|
|
if(lex->token != '}') {
|
|
error_set(error, lex, "'}' expected");
|
|
goto error;
|
|
}
|
|
|
|
return object;
|
|
|
|
error:
|
|
json_decref(object);
|
|
return NULL;
|
|
}
|
|
|
|
static json_t *parse_array(lex_t *lex, json_error_t *error)
|
|
{
|
|
json_t *array = json_array();
|
|
if(!array)
|
|
return NULL;
|
|
|
|
lex_scan(lex, error);
|
|
if(lex->token == ']')
|
|
return array;
|
|
|
|
while(lex->token) {
|
|
json_t *elem = parse_value(lex, error);
|
|
if(!elem)
|
|
goto error;
|
|
|
|
if(json_array_append(array, elem)) {
|
|
json_decref(elem);
|
|
goto error;
|
|
}
|
|
json_decref(elem);
|
|
|
|
lex_scan(lex, error);
|
|
if(lex->token != ',')
|
|
break;
|
|
|
|
lex_scan(lex, error);
|
|
}
|
|
|
|
if(lex->token != ']') {
|
|
error_set(error, lex, "']' expected");
|
|
goto error;
|
|
}
|
|
|
|
return array;
|
|
|
|
error:
|
|
json_decref(array);
|
|
return NULL;
|
|
}
|
|
|
|
static json_t *parse_value(lex_t *lex, json_error_t *error)
|
|
{
|
|
json_t *json;
|
|
|
|
switch(lex->token) {
|
|
case TOKEN_STRING: {
|
|
json = json_string_nocheck(lex->value.string);
|
|
break;
|
|
}
|
|
|
|
case TOKEN_INTEGER: {
|
|
json = json_integer(lex->value.integer);
|
|
break;
|
|
}
|
|
|
|
case TOKEN_REAL: {
|
|
json = json_real(lex->value.real);
|
|
break;
|
|
}
|
|
|
|
case TOKEN_TRUE:
|
|
json = json_true();
|
|
break;
|
|
|
|
case TOKEN_FALSE:
|
|
json = json_false();
|
|
break;
|
|
|
|
case TOKEN_NULL:
|
|
json = json_null();
|
|
break;
|
|
|
|
case '{':
|
|
json = parse_object(lex, error);
|
|
break;
|
|
|
|
case '[':
|
|
json = parse_array(lex, error);
|
|
break;
|
|
|
|
case TOKEN_INVALID:
|
|
error_set(error, lex, "invalid token");
|
|
return NULL;
|
|
|
|
default:
|
|
error_set(error, lex, "unexpected token");
|
|
return NULL;
|
|
}
|
|
|
|
if(!json)
|
|
return NULL;
|
|
|
|
return json;
|
|
}
|
|
|
|
static json_t *parse_json(lex_t *lex, json_error_t *error)
|
|
{
|
|
error_init(error);
|
|
|
|
lex_scan(lex, error);
|
|
if(lex->token != '[' && lex->token != '{') {
|
|
error_set(error, lex, "'[' or '{' expected");
|
|
return NULL;
|
|
}
|
|
|
|
return parse_value(lex, error);
|
|
}
|
|
|
|
typedef struct
|
|
{
|
|
const char *data;
|
|
int pos;
|
|
} string_data_t;
|
|
|
|
static int string_get(void *data)
|
|
{
|
|
char c;
|
|
string_data_t *stream = (string_data_t *)data;
|
|
c = stream->data[stream->pos];
|
|
if(c == '\0')
|
|
return EOF;
|
|
else
|
|
{
|
|
stream->pos++;
|
|
return c;
|
|
}
|
|
}
|
|
|
|
static int string_eof(void *data)
|
|
{
|
|
string_data_t *stream = (string_data_t *)data;
|
|
return (stream->data[stream->pos] == '\0');
|
|
}
|
|
|
|
json_t *json_loads(const char *string, json_error_t *error)
|
|
{
|
|
lex_t lex;
|
|
json_t *result;
|
|
|
|
string_data_t stream_data = {
|
|
.data = string,
|
|
.pos = 0
|
|
};
|
|
|
|
if(lex_init(&lex, string_get, string_eof, (void *)&stream_data))
|
|
return NULL;
|
|
|
|
result = parse_json(&lex, error);
|
|
if(!result)
|
|
goto out;
|
|
|
|
lex_scan(&lex, error);
|
|
if(lex.token != TOKEN_EOF) {
|
|
error_set(error, &lex, "end of file expected");
|
|
json_decref(result);
|
|
result = NULL;
|
|
}
|
|
|
|
out:
|
|
lex_close(&lex);
|
|
return result;
|
|
}
|
|
|
|
json_t *json_loadf(FILE *input, json_error_t *error)
|
|
{
|
|
lex_t lex;
|
|
json_t *result;
|
|
|
|
if(lex_init(&lex, (get_func)fgetc, (eof_func)feof, input))
|
|
return NULL;
|
|
|
|
result = parse_json(&lex, error);
|
|
if(!result)
|
|
goto out;
|
|
|
|
lex_scan(&lex, error);
|
|
if(lex.token != TOKEN_EOF) {
|
|
error_set(error, &lex, "end of file expected");
|
|
json_decref(result);
|
|
result = NULL;
|
|
}
|
|
|
|
out:
|
|
lex_close(&lex);
|
|
return result;
|
|
}
|
|
|
|
json_t *json_load_file(const char *path, json_error_t *error)
|
|
{
|
|
json_t *result;
|
|
FILE *fp;
|
|
|
|
error_init(error);
|
|
|
|
fp = fopen(path, "r");
|
|
if(!fp)
|
|
{
|
|
error_set(error, NULL, "unable to open %s: %s",
|
|
path, strerror(errno));
|
|
return NULL;
|
|
}
|
|
|
|
result = json_loadf(fp, error);
|
|
|
|
fclose(fp);
|
|
return result;
|
|
}
|