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pgdevel / src / include / utils / jsonapi.h

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Andrew Dunstan 4f98159 
Andrew Dunstan 7673379 
Andrew Dunstan 4f98159 
Andrew Dunstan c333f85 




Andrew Dunstan cdddd17 
Andrew Dunstan c333f85 



Andrew Dunstan 4f98159 
Andrew Dunstan c333f85 



Andrew Dunstan 4f98159 


Andrew Dunstan 7673379 
Andrew Dunstan 4f98159 
Andrew Dunstan 7673379 
Andrew Dunstan 4f98159 
Andrew Dunstan c333f85 










Andrew Dunstan 4f98159 



Andrew Dunstan c333f85 
Andrew Dunstan 4f98159 




Andrew Dunstan c333f85 
Andrew Dunstan 4f98159 
Andrew Dunstan cdddd17 


Andrew Dunstan 4f98159 
/*-------------------------------------------------------------------------
 *
 * jsonapi.h
 *	  Declarations for JSON API support.
 *
 * Portions Copyright (c) 1996-2012, 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;

typedef struct JsonLexContext
{
	char	   *input;
	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);


/*
 * any of these actions can be NULL, in which case nothig is done.
 */
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, *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);

/* constructor for JsonLexContext, with or without strval element */
extern JsonLexContext *makeJsonLexContext(char * json, bool need_escapes);

#endif   /* JSONAPI_H */