// metapost.rl written by Mitchell Foral. mitchell<att>caladbolg<dott>net.
/************************* Required for every parser *************************/
#ifndef OHCOUNT_METAPOST_PARSER_H
#define OHCOUNT_METAPOST_PARSER_H
#include "../parser_macros.h"
// the name of the language
const char *METAPOST_LANG = LANG_METAPOST;
// the languages entities
const char *metapost_entities[] = {
"space", "comment", "string", "any",
};
// constants associated with the entities
enum {
METAPOST_SPACE = 0, METAPOST_COMMENT, METAPOST_STRING, METAPOST_ANY
};
/*****************************************************************************/
%%{
machine metapost;
write data;
include common "common.rl";
# Line counting machine
action metapost_ccallback {
switch(entity) {
case METAPOST_SPACE:
ls
break;
case METAPOST_ANY:
code
break;
case INTERNAL_NL:
std_internal_newline(METAPOST_LANG)
break;
case NEWLINE:
std_newline(METAPOST_LANG)
}
}
metapost_comment = '%' @{ fhold; } @comment nonnewline*;
metapost_string = '"' @code ([^\r\n\f"\\] | '\\' nonnewline)* '"';
metapost_line := |*
spaces ${ entity = METAPOST_SPACE; } => metapost_ccallback;
metapost_comment;
metapost_string;
newline ${ entity = NEWLINE; } => metapost_ccallback;
^space ${ entity = METAPOST_ANY; } => metapost_ccallback;
*|;
# Entity machine
action metapost_ecallback {
callback(METAPOST_LANG, metapost_entities[entity], cint(ts), cint(te),
userdata);
}
metapost_comment_entity = '%' nonnewline*;
metapost_entity := |*
space+ ${ entity = METAPOST_SPACE; } => metapost_ecallback;
metapost_comment_entity ${ entity = METAPOST_COMMENT; } => metapost_ecallback;
# TODO:
^space;
*|;
}%%
/************************* Required for every parser *************************/
/* Parses a string buffer with Metapost 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_metapost(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) ? metapost_en_metapost_line : metapost_en_metapost_entity;
%% write exec;
// if no newline at EOF; callback contents of last line
if (count) { process_last_line(METAPOST_LANG) }
}
#endif
/*****************************************************************************/