// r.rl copied from matlabl.rl written by Mitchell Foral. mitchell<att>caladbolg<dott>net.
// adapted by Mark Hoebeke mark@<att>hoebeke<dot>eu
/************************* Required for every parser *************************/
#ifndef OHCOUNT_R_PARSER_H
#define OHCOUNT_R_PARSER_H
#include "../parser_macros.h"
// the name of the language
const char *R_LANG = LANG_R;
// the languages entities
const char *r_entities[] = {
"space", "comment", "string", "any",
};
// constants associated with the entities
enum {
R_SPACE = 0, R_COMMENT, R_STRING, R_ANY
};
/*****************************************************************************/
%%{
machine r;
write data;
include common "common.rl";
# Line counting machine
action r_ccallback {
switch(entity) {
case R_SPACE:
ls
break;
case R_ANY:
code
break;
case INTERNAL_NL:
std_internal_newline(R_LANG)
break;
case NEWLINE:
std_newline(R_LANG)
}
}
r_line_comment = ( '#') @comment nonnewline*;
r_comment = r_line_comment;
r_sq_str = '\'' @code ([^\r\n\f'\\] | '\\' nonnewline)* '\'';
r_dq_str = '"' @code ([^\r\n\f"\\] | '\\' nonnewline)* '"';
r_string = r_sq_str | r_dq_str;
r_line := |*
spaces ${ entity = R_SPACE; } => r_ccallback;
r_comment;
r_string;
newline ${ entity = NEWLINE; } => r_ccallback;
^space ${ entity = R_ANY; } => r_ccallback;
*|;
# Entity machine
action r_ecallback {
callback(R_LANG, r_entities[entity], cint(ts), cint(te), userdata);
}
r_line_comment_entity = ('#') nonnewline*;
r_comment_entity = r_line_comment_entity;
r_entity := |*
space+ ${ entity = R_SPACE; } => r_ecallback;
r_comment_entity ${ entity = R_COMMENT; } => r_ecallback;
# TODO:
^space;
*|;
}%%
/************************* Required for every parser *************************/
/* Parses a string buffer with R code.
*
* @param *buffer The string to parse.
* @param length The length of the string to parse.
* @param count Integer flag specifying whether or not to count lines. If yes,
* uses the Ragel machine optimized for counting. Otherwise uses the Ragel
* machine optimized for returning entity positions.
* @param *callback Callback function. If count is set, callback is called for
* every line of code, comment, or blank with 'lcode', 'lcomment', and
* 'lblank' respectively. Otherwise callback is called for each entity found.
*/
void parse_r(char *buffer, int length, int count,
void (*callback) (const char *lang, const char *entity, int s,
int e, void *udata),
void *userdata
) {
init
%% write init;
cs = (count) ? r_en_r_line : r_en_r_entity;
%% write exec;
// if no newline at EOF; callback contents of last line
if (count) { process_last_line(R_LANG) }
}
#endif
/*****************************************************************************/