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The JSON specification technically disallows maps with numeric keys, so we'll want to slowly migrate away from using them. This helper extracts the numeric value from a quoted number, which is a legal representation of the same in JSON.
131 lines
4.7 KiB
C
131 lines
4.7 KiB
C
/* Very simple core JSON parse helpers: used by lightning-cli too */
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#ifndef LIGHTNING_COMMON_JSON_PARSE_SIMPLE_H
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#define LIGHTNING_COMMON_JSON_PARSE_SIMPLE_H
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#include "config.h"
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#include <ccan/short_types/short_types.h>
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#include <ccan/tal/tal.h>
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#define JSMN_STRICT 1
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# include <external/jsmn/jsmn.h>
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/* Include " if it's a string. */
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const char *json_tok_full(const char *buffer, const jsmntok_t *t);
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/* Include " if it's a string. */
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int json_tok_full_len(const jsmntok_t *t);
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/* Is this a string equal to str? */
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bool json_tok_streq(const char *buffer, const jsmntok_t *tok, const char *str);
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/* Is this a string equal to str of length len? */
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bool json_tok_strneq(const char *buffer, const jsmntok_t *tok,
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const char *str, size_t len);
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/* Does this string token start with prefix? */
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bool json_tok_startswith(const char *buffer, const jsmntok_t *tok,
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const char *prefix);
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/* Does this string token end with suffix? */
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bool json_tok_endswith(const char *buffer, const jsmntok_t *tok,
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const char *suffix);
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/* Allocate a tal string copy */
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char *json_strdup(const tal_t *ctx, const char *buffer, const jsmntok_t *tok);
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/* Extract number from this (may be a string, or a number literal) */
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bool json_to_u64(const char *buffer, const jsmntok_t *tok, u64 *num);
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/* Extract number from string. The number must be the entirety of the
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* string between the '"' */
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bool json_str_to_u64(const char *buffer, const jsmntok_t *tok, u64 *num);
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/* Extract number from this (may be a string, or a number literal) */
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bool json_to_u32(const char *buffer, const jsmntok_t *tok, u32 *num);
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/* Extract boolean from this */
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bool json_to_bool(const char *buffer, const jsmntok_t *tok, bool *b);
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/* Is this a number? [0..9]+ */
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bool json_tok_is_num(const char *buffer, const jsmntok_t *tok);
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/* Is this the null primitive? */
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bool json_tok_is_null(const char *buffer, const jsmntok_t *tok);
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/* Returns next token with same parent (WARNING: slow!). */
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const jsmntok_t *json_next(const jsmntok_t *tok);
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/* Get top-level member with explicit label len */
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const jsmntok_t *json_get_membern(const char *buffer,
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const jsmntok_t tok[],
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const char *label, size_t len);
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/* Get top-level member. */
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const jsmntok_t *json_get_member(const char *buffer, const jsmntok_t tok[],
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const char *label);
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/* Get index'th array member. */
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const jsmntok_t *json_get_arr(const jsmntok_t tok[], size_t index);
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/* Helper to get "id" field from object. */
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const char *json_get_id(const tal_t *ctx,
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const char *buffer, const jsmntok_t *obj);
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/* Allocate a starter array of tokens for json_parse_input */
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jsmntok_t *toks_alloc(const tal_t *ctx);
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/* Reset a token array to reuse it. */
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void toks_reset(jsmntok_t *toks);
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/**
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* json_parse_input: parse and validate JSON.
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* @parser: parser initialized with jsmn_init.
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* @toks: tallocated array from toks_alloc()
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* @input, @len: input string.
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* @complete: set to true if the valid JSON is complete, or NULL if must be.
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*
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* This returns false if the JSON is invalid, true otherwise.
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* If it returns true, *@complete indicates that (*@toks)[0] points to a
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* valid, complete JSON element. If @complete is NULL, then incomplete
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* JSON returns false (i.e. is considered invalid).
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*
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* *@toks is resized to the complete set of tokens, with a dummy
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* terminator (type == -1) at the end.
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*
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* If it returns true, and *@complete is false, you can append more
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* data to @input and call it again (with the same perser) and the parser
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* will continue where it left off.
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*/
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bool json_parse_input(jsmn_parser *parser,
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jsmntok_t **toks,
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const char *input, int len,
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bool *complete);
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/* Simplified version of above which parses only a complete, valid
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* JSON string */
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jsmntok_t *json_parse_simple(const tal_t *ctx, const char *input, int len);
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/* Convert a jsmntype_t enum to a human readable string. */
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const char *jsmntype_to_string(jsmntype_t t);
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/* Return a copy of a json value as an array. */
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jsmntok_t *json_tok_copy(const tal_t *ctx, const jsmntok_t *tok);
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/*
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* Remove @num json values from a json array or object @obj. @tok points
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* to the first value to remove. The array @tokens will be resized.
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*/
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void json_tok_remove(jsmntok_t **tokens,
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jsmntok_t *obj_or_array, const jsmntok_t *tok, size_t num);
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/* Iterator macro for array: i is counter, t is token ptr, arr is JSMN_ARRAY */
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#define json_for_each_arr(i, t, arr) \
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for (i = 0, t = (arr) + 1; i < (arr)->size; t = json_next(t), i++)
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/* Iterator macro for object: i is counter, t is token ptr (t+1 is
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* contents of obj member), obj is JSMN_OBJECT */
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#define json_for_each_obj(i, t, obj) \
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for (i = 0, t = (obj) + 1; i < (obj)->size; t = json_next(t+1), i++)
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#endif /* LIGHTNING_COMMON_JSON_PARSE_SIMPLE_H */
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