mirror of
git://git.psyc.eu/libpsyc
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171 lines
5.1 KiB
C
171 lines
5.1 KiB
C
/**
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* @file psyc/parser.h
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* @brief Interface for various PSYC parser functions.
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*
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* All parsing functions and the definitions they use are
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* defined in this file.
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*/
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/**
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* @defgroup parsing Parsing Functions
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*
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* This module contains all parsing functions.
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* @{
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*/
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#ifndef PSYC_PARSER_H
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# define PSYC_PARSER_H
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#include <stdint.h>
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#include <string.h>
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typedef enum
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{
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/// Parse only the header
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PSYC_PARSE_ROUTING_ONLY = 1,
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/// Expects only the content part of a packet. The buffer should contain the whole content in this case.
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PSYC_PARSE_START_AT_CONTENT = 2,
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} psycParseFlag;
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/**
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* The return value definitions for the packet parsing function.
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* @see psyc_parse()
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*/
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typedef enum
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{
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PSYC_PARSE_ERROR_END = -9,
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PSYC_PARSE_ERROR_BODY = -8,
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PSYC_PARSE_ERROR_METHOD = -7,
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PSYC_PARSE_ERROR_MOD_NL = -6,
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PSYC_PARSE_ERROR_MOD_LEN = -5,
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PSYC_PARSE_ERROR_MOD_TAB = -4,
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PSYC_PARSE_ERROR_MOD_NAME = -3,
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PSYC_PARSE_ERROR_LENGTH = -2,
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PSYC_PARSE_ERROR = -1,
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PSYC_PARSE_SUCCESS = 0,
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/// Buffer contains insufficient amount of data.
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/// Fill another buffer and concatenate it with the end of the current buffer,
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/// from the cursor position to the end.
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PSYC_PARSE_INSUFFICIENT = 1,
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/// Routing modifier parsing done.
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/// Operator, name & value contains the respective parts.
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PSYC_PARSE_ROUTING = 2,
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/// Entity modifier parsing done.
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/// Operator, name & value contains the respective parts.
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PSYC_PARSE_ENTITY = 3,
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/// Entity modifier parsing is incomplete.
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/// Operator & name are complete, value is incomplete.
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PSYC_PARSE_ENTITY_INCOMPLETE = 4,
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/// Body parsing done, name contains method, value contains body.
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PSYC_PARSE_BODY = 5,
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/// Body parsing is incomplete, name contains method, value contains part of the body.
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PSYC_PARSE_BODY_INCOMPLETE = 6,
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/// Reached end of packet, parsing done.
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PSYC_PARSE_COMPLETE = 7,
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/// Binary value parsing incomplete, used internally.
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PSYC_PARSE_INCOMPLETE = 8,
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} psycParseRC;
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/**
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* The return value definitions for the list parsing function.
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* @see psyc_parseList()
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*/
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typedef enum
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{
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PSYC_PARSE_LIST_ERROR_DELIM = -5,
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PSYC_PARSE_LIST_ERROR_LEN = -4,
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PSYC_PARSE_LIST_ERROR_TYPE = -3,
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PSYC_PARSE_LIST_ERROR_NAME = -2,
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PSYC_PARSE_LIST_ERROR= -1,
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/// Completed parsing a list element.
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PSYC_PARSE_LIST_ELEM = 1,
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/// Reached end of buffer.
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PSYC_PARSE_LIST_END = 2,
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/// Binary list is incomplete.
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PSYC_PARSE_LIST_INCOMPLETE = 3,
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} psycParseListRC;
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/**
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* Struct for keeping parser state.
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*/
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typedef struct
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{
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size_t cursor; ///< current position in buffer
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size_t startc; ///< position where the parsing would be resumed
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psycString buffer; ///< buffer with data to be parsed
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uint8_t flags; ///< flags for the parser, see psycParseFlag
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psycPart part; ///< part of the packet being parsed currently
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size_t routingLength; ///< length of routing part parsed so far
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size_t contentParsed; ///< number of bytes parsed from the content so far
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size_t contentLength; ///< expected length of the content
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psycBool contentLengthFound; ///< is there a length given for this packet?
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size_t valueParsed; ///< number of bytes parsed from the value so far
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size_t valueLength; ///< expected length of the value
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} psycParseState;
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/**
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* Struct for keeping list parser state.
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*/
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typedef struct
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{
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size_t cursor; ///< current position in buffer
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size_t startc; ///< line start position
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psycString buffer;
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psycListType type; ///< list type
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size_t elemParsed; ///< number of bytes parsed from the elem so far
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size_t elemLength; ///< expected length of the elem
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} psycParseListState;
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/**
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* Initiates the state struct.
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*
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* @param state Pointer to the state struct that should be initiated.
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*/
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inline void psyc_initParseState (psycParseState* state);
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/**
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* Initiates the state struct with flags.
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*
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* @param state Pointer to the state struct that should be initiated.
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* @param flags Flags to be set for the parser, see psycParseFlag.
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*/
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inline void psyc_initParseState2 (psycParseState* state, uint8_t flags);
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/**
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* Initiates the list state struct.
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*
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* @param state Pointer to the list state struct that should be initiated.
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*/
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inline void psyc_initParseListState (psycParseListState* state);
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inline void psyc_nextParseBuffer (psycParseState* state, psycString newBuf);
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inline void psyc_nextParseListBuffer (psycParseListState* state, psycString newBuf);
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inline size_t psyc_getContentLength (psycParseState* s);
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/**
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* Parse PSYC packets.
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*
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* Generalized line-based packet parser.
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*
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* @param state An initialized psycParseState
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* @param operator A pointer to a character. In case of a variable, it will
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* be set to the operator of that variable
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* @param name A pointer to a psycString. It will point to the name of
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* the variable or method and its length will be set accordingly
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* @param value A pointer to a psycString. It will point to the
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* value/body the variable/method and its length will be set accordingly
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*/
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psycParseRC psyc_parse(psycParseState* state, char* oper, psycString* name, psycString* value);
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/**
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* List value parser.
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*/
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psycParseListRC psyc_parseList(psycParseListState* state, psycString *name, psycString* value, psycString* elem);
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#endif // PSYC_PARSER_H
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/** @} */ // end of parsing group
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