lexer.h File Reference

#include <stddef.h>
#include "rcl/allocator.h"
#include "rcl/macros.h"
#include "rcl/types.h"
#include "rcl/visibility_control.h"

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Typedefs
typedef enum rcl_lexeme_t	rcl_lexeme_t
	Type of lexeme found by lexical analysis. More...

Enumerations
enum	rcl_lexeme_t {   RCL_LEXEME_NONE = 0, RCL_LEXEME_EOF = 1, RCL_LEXEME_TILDE_SLASH = 2, RCL_LEXEME_URL_SERVICE = 3,   RCL_LEXEME_URL_TOPIC = 4, RCL_LEXEME_COLON = 5, RCL_LEXEME_NODE = 6, RCL_LEXEME_NS = 7,   RCL_LEXEME_SEPARATOR = 8, RCL_LEXEME_BR1 = 9, RCL_LEXEME_BR2 = 10, RCL_LEXEME_BR3 = 11,   RCL_LEXEME_BR4 = 12, RCL_LEXEME_BR5 = 13, RCL_LEXEME_BR6 = 14, RCL_LEXEME_BR7 = 15,   RCL_LEXEME_BR8 = 16, RCL_LEXEME_BR9 = 17, RCL_LEXEME_TOKEN = 18, RCL_LEXEME_FORWARD_SLASH = 19,   RCL_LEXEME_WILD_ONE = 20, RCL_LEXEME_WILD_MULTI = 21, RCL_LEXEME_DOT = 22 }
	Type of lexeme found by lexical analysis. More...

Functions
rcl_ret_t	rcl_lexer_analyze (const char *text, rcl_lexeme_t *lexeme, size_t *length)
	Do lexical analysis on a string. More...

Typedef Documentation

rcl_lexeme_t

typedef enum rcl_lexeme_t rcl_lexeme_t

Type of lexeme found by lexical analysis.

Enumeration Type Documentation

rcl_lexeme_t

enum rcl_lexeme_t

Type of lexeme found by lexical analysis.

Enumerator
RCL_LEXEME_NONE	Indicates no valid lexeme was found (end of input not reached)
RCL_LEXEME_EOF	Indicates end of input has been reached.
RCL_LEXEME_TILDE_SLASH	~/
RCL_LEXEME_URL_SERVICE	rosservice://
RCL_LEXEME_URL_TOPIC	rostopic://
RCL_LEXEME_COLON	:
RCL_LEXEME_NODE	__node
RCL_LEXEME_NS	__ns
RCL_LEXEME_SEPARATOR	:=
RCL_LEXEME_BR1	\1
RCL_LEXEME_BR2	\2
RCL_LEXEME_BR3	\3
RCL_LEXEME_BR4	\4
RCL_LEXEME_BR5	\5
RCL_LEXEME_BR6	\6
RCL_LEXEME_BR7	\7
RCL_LEXEME_BR8	\8
RCL_LEXEME_BR9	\9
RCL_LEXEME_TOKEN	a name between slashes, must match (([a-zA-Z](_)?)|_)([0-9a-zA-Z](_)?)*
RCL_LEXEME_FORWARD_SLASH	/
RCL_LEXEME_WILD_ONE
RCL_LEXEME_WILD_MULTI	**
RCL_LEXEME_DOT

Function Documentation

rcl_lexer_analyze()

rcl_ret_t rcl_lexer_analyze	(	const char *	text,
		rcl_lexeme_t *	lexeme,
		size_t *	length
	)

Do lexical analysis on a string.

This function analyzes a string to see if it starts with a valid lexeme. If the string does not begin with a valid lexeme then lexeme will be RCL_LEXEME_NONE, and the length will be set to include the character that made it impossible. If the first character is '\0' then lexeme will be RCL_LEXEME_EOF.

---

Attribute	Adherence
Allocates Memory	No
Thread-Safe	Yes
Uses Atomics	No
Lock-Free	Yes

Parameters

[in]	text	The string to analyze.
[out]	lexeme	The type of lexeme found in the string.
[out]	length	The length of text in the string that constitutes the found lexeme.

Returns

RCL_RET_OK if analysis is successful regardless whether a valid lexeme is found, or

RCL_RET_INVALID_ARGUMENT if any function arguments are invalid, or

RCL_RET_ERROR if an internal bug is detected.