shortcode/shortcodes.rl

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#include <string.h>
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#include "shortcodes.h"
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%%{
machine shortcode;
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action mark {
mark = p;
}
spc = space*;
sep = space+;
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path = (alnum | '/' )+;
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name = (alpha+ path?)
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> mark
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%{ sc_list[c_sc].name.start = mark-start;
sc_list[c_sc].name.len = p-mark;
sc_list[c_sc].matching = 0;
};
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argname = alpha+
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> mark
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% {
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sc_list[c_sc].argnames[sc_list[c_sc].argcount].start = mark-start;
sc_list[c_sc].argnames[sc_list[c_sc].argcount].len = p-mark;
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};
qvalue = ('"' [^"]* '"')
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> mark
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% {
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sc_list[c_sc].argvals[sc_list[c_sc].argcount].start = mark-start+1;
sc_list[c_sc].argvals[sc_list[c_sc].argcount].len = p-mark-2;
sc_list[c_sc].argcount++;
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};
value = alnum+
> mark
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% {
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sc_list[c_sc].argvals[sc_list[c_sc].argcount].start = mark-start;
sc_list[c_sc].argvals[sc_list[c_sc].argcount].len = p-mark;
sc_list[c_sc].argcount++;
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};
arg = ((argname '=')? (value|qvalue));
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start_p = ('{{%');
end_p = '%}}';
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start_b = ('{{<');
end_b = '>}}';
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content = spc name (sep arg)* spc;
start = start_p | start_b ;
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end = end_p | end_b ;
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mismatched = ((start_p content end_b) | (start_b content end_p))
@{
// Since it's mismatched, remove the name
sc_list[c_sc].name.start = 0;
sc_list[c_sc].name.len=0;
result.errors[result.errcount].position = p-start-2;
result.errors[result.errcount].code = ERR_MISMATCHED_BRACKET;
result.errcount++;
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};
shortcode = ((start_p content end_p) | (start_b content end_b))
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> {
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sc_list[c_sc].whole.start = p-start-1;
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}
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@ {
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sc_list[c_sc].whole.len = p-start-sc_list[c_sc].whole.start+1;
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data_mark = p+1;
c_sc++;
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};
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closing_shortcode = (start spc '/' name spc end)
> {
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// Starting a "closing" shortcode ( {{ /foo }}),
// close data (if previous shortcode is opening)
// If previous shortcode was closing, then previous
// text can't be data.
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if (sc_list[c_sc-1].matching == 0) {
sc_list[c_sc-1].data.start = data_mark-start;
sc_list[c_sc-1].data.len = p-data_mark-1;
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}
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};
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matched_shortcode = (shortcode any* closing_shortcode)
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@ {
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if (
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sc_list[c_sc-1].name.len != sc_list[c_sc].name.len ||
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strncmp(
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start + sc_list[c_sc-1].name.start,
start + sc_list[c_sc].name.start,
sc_list[c_sc-1].name.len) !=0)
{
result.errors[result.errcount].position =
sc_list[c_sc].whole.start;
result.errors[result.errcount].code = ERR_MISMATCHED_CLOSING_TAG;
result.errcount++;
} else {
// The previous shortcode is matching (mark it)
sc_list[c_sc-1].matching = 1;
sc_list[c_sc-1].whole.len = p-start-sc_list[c_sc-1].whole.start + 1;
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}
// Do NOT increase c_sc
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};
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main := (any* (shortcode | matched_shortcode | mismatched))*;
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}%%
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sc_result parse(char *input) {
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%%write data;
char *eof, *ts, *te = 0;
int cs, act = 0;
char *start = input;
char *p = input;
char *pe = p + strlen(input);
sc_result result;
shortcode *sc_list = result.sc;
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int c_sc = 0;
char *mark = p;
char *data_mark = p;
%% write init;
%% write exec;
result.sccount = c_sc;
return result;
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}