rcl  master
C API providing common ROS client library functionality.
Typedefs | Enumerations | Functions
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.
 

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...
 

Enumeration Type Documentation

◆ 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 or __name

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]textThe string to analyze.
[out]lexemeThe type of lexeme found in the string.
[out]lengthThe 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.