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/*------------------------------------------------------------------------- * * jsonapi.h * Declarations for JSON API support. * * Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * * src/include/utils/jsonapi.h * *------------------------------------------------------------------------- */ #ifndef JSONAPI_H #define JSONAPI_H #include "lib/stringinfo.h" typedef enum { JSON_TOKEN_INVALID, JSON_TOKEN_STRING, JSON_TOKEN_NUMBER, JSON_TOKEN_OBJECT_START, JSON_TOKEN_OBJECT_END, JSON_TOKEN_ARRAY_START, JSON_TOKEN_ARRAY_END, JSON_TOKEN_COMMA, JSON_TOKEN_COLON, JSON_TOKEN_TRUE, JSON_TOKEN_FALSE, JSON_TOKEN_NULL, JSON_TOKEN_END } JsonTokenType; /* * All the fields in this structure should be treated as read-only. * * If strval is not null, then it should contain the de-escaped value * of the lexeme if it's a string. Otherwise most of these field names * should be self-explanatory. * * line_number and line_start are principally for use by the parser's * error reporting routines. * token_terminator and prev_token_terminator point to the character * AFTER the end of the token, i.e. where there would be a nul byte * if we were using nul-terminated strings. */ typedef struct JsonLexContext { char *input; int input_length; char *token_start; char *token_terminator; char *prev_token_terminator; JsonTokenType token_type; int lex_level; int line_number; char *line_start; StringInfo strval; } JsonLexContext; typedef void (*json_struct_action) (void *state); typedef void (*json_ofield_action) (void *state, char *fname, bool isnull); typedef void (*json_aelem_action) (void *state, bool isnull); typedef void (*json_scalar_action) (void *state, char *token, JsonTokenType tokentype); /* * Semantic Action structure for use in parsing json. * Any of these actions can be NULL, in which case nothing is done at that * point, Likewise, semstate can be NULL. Using an all-NULL structure amounts * to doing a pure parse with no side-effects, and is therefore exactly * what the json input routines do. * * The 'fname' and 'token' strings passed to these actions are palloc'd. * They are not free'd or used further by the parser, so the action function * is free to do what it wishes with them. */ typedef struct JsonSemAction { void *semstate; json_struct_action object_start; json_struct_action object_end; json_struct_action array_start; json_struct_action array_end; json_ofield_action object_field_start; json_ofield_action object_field_end; json_aelem_action array_element_start; json_aelem_action array_element_end; json_scalar_action scalar; } JsonSemAction; /* * parse_json will parse the string in the lex calling the * action functions in sem at the appropriate points. It is * up to them to keep what state they need in semstate. If they * need access to the state of the lexer, then its pointer * should be passed to them as a member of whatever semstate * points to. If the action pointers are NULL the parser * does nothing and just continues. */ extern void pg_parse_json(JsonLexContext *lex, JsonSemAction *sem); /* * json_count_array_elements performs a fast secondary parse to determine the * number of elements in passed array lex context. It should be called from an * array_start action. */ extern int json_count_array_elements(JsonLexContext *lex); /* * constructors for JsonLexContext, with or without strval element. * If supplied, the strval element will contain a de-escaped version of * the lexeme. However, doing this imposes a performance penalty, so * it should be avoided if the de-escaped lexeme is not required. * * If you already have the json as a text* value, use the first of these * functions, otherwise use makeJsonLexContextCstringLen(). */ extern JsonLexContext *makeJsonLexContext(text *json, bool need_escapes); extern JsonLexContext *makeJsonLexContextCstringLen(char *json, int len, bool need_escapes); /* * Utility function to check if a string is a valid JSON number. * * str agrument does not need to be nul-terminated. */ extern bool IsValidJsonNumber(const char *str, int len); #endif /* JSONAPI_H */