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authorJohn MacFarlane <jgm@berkeley.edu>2015-01-10 10:06:21 -0800
committerJohn MacFarlane <jgm@berkeley.edu>2015-01-10 10:06:21 -0800
commit54c40bbc4bd09bce30ff6a45e9a9fcb08073a3c1 (patch)
tree3739c63762492d4717168caccddbc9f1e0846cd5 /js/lib
parent64ee8123152b4c2696bacbe6ad3a274c933a2835 (diff)
Regex optimizations in inlines.js.
Diffstat (limited to 'js/lib')
-rw-r--r--js/lib/inlines.js39
1 files changed, 26 insertions, 13 deletions
diff --git a/js/lib/inlines.js b/js/lib/inlines.js
index 72c4448..4370df7 100644
--- a/js/lib/inlines.js
+++ b/js/lib/inlines.js
@@ -75,6 +75,18 @@ var reAutolink = /^<(?:coap|doi|javascript|aaa|aaas|about|acap|cap|cid|crid|data
var reSpnl = /^ *(?:\n *)?/;
+var reWhitespaceChar = /^\s/;
+
+var reWhitespace = /\s+/g;
+
+var reFinalSpace = / *$/;
+
+var reInitialSpace = /^ */;
+
+var reAsciiAlnum = /[a-z0-9]/i;
+
+var reLinkLabel = /^\[(?:[^\\\[\]]|\\[\[\]]){0,1000}\]/;
+
// Matches a string of non-special characters.
var reMain = /^[^\n`\[\]\\!<&*_]+/m;
@@ -167,8 +179,7 @@ var parseBackticks = function(block) {
node = new Node('Code');
node.literal = this.subject.slice(afterOpenTicks,
this.pos - ticks.length)
- .replace(/[ \n]+/g, ' ')
- .trim();
+ .trim().replace(reWhitespace, ' ');
block.appendChild(node);
return true;
}
@@ -270,17 +281,17 @@ var scanDelims = function(cc) {
char_after = fromCodePoint(cc_after);
}
- var can_open = numdelims > 0 && !(/\s/.test(char_after)) &&
+ var can_open = numdelims > 0 && !(reWhitespaceChar.test(char_after)) &&
!(rePunctuation.test(char_after) &&
!(/\s/.test(char_before)) &&
!(rePunctuation.test(char_before)));
- var can_close = numdelims > 0 && !(/\s/.test(char_before)) &&
+ var can_close = numdelims > 0 && !(reWhitespaceChar.test(char_before)) &&
!(rePunctuation.test(char_before) &&
- !(/\s/.test(char_after)) &&
+ !(reWhitespaceChar.test(char_after)) &&
!(rePunctuation.test(char_after)));
if (cc === C_UNDERSCORE) {
- can_open = can_open && !((/[a-z0-9]/i).test(char_before));
- can_close = can_close && !((/[a-z0-9]/i).test(char_after));
+ can_open = can_open && !((reAsciiAlnum).test(char_before));
+ can_close = can_close && !((reAsciiAlnum).test(char_after));
}
this.pos = startpos;
return { numdelims: numdelims,
@@ -463,7 +474,7 @@ var parseLinkDestination = function() {
// Attempt to parse a link label, returning number of characters parsed.
var parseLinkLabel = function() {
"use strict";
- var m = this.match(/^\[(?:[^\\\[\]]|\\[\[\]]){0,1000}\]/);
+ var m = this.match(reLinkLabel);
return m === null ? 0 : m.length;
};
@@ -581,10 +592,11 @@ var parseCloseBracket = function(block) {
((dest = this.parseLinkDestination()) !== null) &&
this.spnl() &&
// make sure there's a space before the title:
- (/^\s/.test(this.subject.charAt(this.pos - 1)) &&
+ (reWhitespaceChar.test(this.subject.charAt(this.pos - 1)) &&
(title = this.parseLinkTitle() || '') || true) &&
this.spnl() &&
- this.match(/^\)/)) {
+ this.subject.charAt(this.pos) === ')') {
+ this.pos += 1;
matched = true;
}
} else {
@@ -691,15 +703,15 @@ var parseNewline = function(block) {
// check previous node for trailing spaces
var lastc = block.lastChild;
if (lastc && lastc.t === 'Text') {
- var sps = / *$/.exec(lastc.literal)[0].length;
+ var sps = reFinalSpace.exec(lastc.literal)[0].length;
if (sps > 0) {
- lastc.literal = lastc.literal.replace(/ *$/, '');
+ lastc.literal = lastc.literal.replace(reFinalSpace, '');
}
block.appendChild(new Node(sps >= 2 ? 'Hardbreak' : 'Softbreak'));
} else {
block.appendChild(new Node('Softbreak'));
}
- this.match(/^ */); // gobble leading spaces in next line
+ this.match(reInitialSpace); // gobble leading spaces in next line
return true;
};
@@ -748,6 +760,7 @@ var parseReference = function(s, refmap) {
this.pos = beforetitle;
}
+ // FIXME
// make sure we're at line end:
if (this.match(/^ *(?:\n|$)/) === null) {
this.pos = startpos;