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add comments and improve variable names

This commit is contained in:
Jens Maier 2014-07-28 18:53:10 +02:00
parent 479eb64a76
commit 90d14d9ffc
1 changed files with 27 additions and 15 deletions
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42
app/assets/javascripts/discourse/dialects/dialect.js
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@ -386,6 +386,7 @@ Discourse.Dialect = {
var pos = args.start.lastIndex - match[0].length,
leading = block.slice(0, pos),
trailing = match[2] ? match[2].replace(/^\n*/, "") : "";
// just give up if there's no stop tag in this or any next block
if (block.indexOf(args.stop, pos + args.stop.length) === -1 && lastChance()) { return; }
if (leading.length > 0) { result.push(['p'].concat(this.processInline(leading))); }
if (trailing.length > 0) {
@ -393,47 +394,58 @@ Discourse.Dialect = {
block.lineNumber + countLines(leading) + (match[2] ? match[2].length : 0) - trailing.length));
}
// find matching stop tag in blocks.
var contentBlocks = [], nesting = 0, endPos, ep, offset, startPos, sp, m, b;
// go through the available blocks to find the matching stop tag.
var contentBlocks = [], nesting = 0, actualEndPos = -1, currentBlock;
blockloop:
while (b = next.shift()) {
while (currentBlock = next.shift()) {
// collect all the start and stop tags in the current block
args.start.lastIndex = 0;
startPos = []; sp = 0;
while (m = (args.start).exec(b)) {
var startPos = [], m;
while (m = (args.start).exec(currentBlock)) {
startPos.push(args.start.lastIndex - m[0].length);
args.start.lastIndex = args.start.lastIndex - (m[2] ? m[2].length : 0);
}
endPos = []; ep = 0; offset = 0;
while ((pos = b.indexOf(args.stop, offset)) !== -1) {
var endPos = [], offset = 0;
while ((pos = currentBlock.indexOf(args.stop, offset)) !== -1) {
endPos.push(pos);
offset += (pos + args.stop.length);
}
// go through the available end tags:
var ep = 0, sp = 0; // array indices
while (ep < endPos.length) {
if (sp < startPos.length && startPos[sp] < endPos[ep]) {
// there's an end tag, but there's also another start tag first. we need to go deeper.
sp++; nesting++;
} else if (nesting > 0) {
// found an end tag, but we must go up a level first.
ep++; nesting--;
} else {
// found an end tag and we're at the top: done!
actualEndPos = endPos[ep];
break blockloop;
}
}
if (lastChance()) {
ep = endPos.length - 1;
// when lastChance() becomes true the first time, currentBlock contains the last
// end tag available in the input blocks but it's not on the right nesting level
// or we would have terminated the loop already. the only thing we can do is to
// treat the last available end tag as tho it were matched with our start tag
// and let the emitter figure out how to render the garbage inside.
actualEndPos = endPos[endPos.length - 1];
break;
}
// any left-over start tags still increase the nesting level
nesting += startPos.length - sp;
contentBlocks.push(b);
contentBlocks.push(currentBlock);
}
if (ep < endPos.length) {
var before = b.slice(0, endPos[ep]).replace(/\n*$/, ""),
after = b.slice(endPos[ep] + args.stop.length).replace(/^\n*/, "");
if (before.length > 0) contentBlocks.push(MD.mk_block(before, "", b.lineNumber));
if (after.length > 0) next.unshift(MD.mk_block(after, "", b.lineNumber + countLines(before)));
}
var before = currentBlock.slice(0, actualEndPos).replace(/\n*$/, ""),
after = currentBlock.slice(actualEndPos + args.stop.length).replace(/^\n*/, "");
if (before.length > 0) contentBlocks.push(MD.mk_block(before, "", currentBlock.lineNumber));
if (after.length > 0) next.unshift(MD.mk_block(after, "", currentBlock.lineNumber + countLines(before)));
var emitterResult = args.emitter.call(this, contentBlocks, match, dialect.options);
if (emitterResult) { result.push(emitterResult); }