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205 lines
4.6 KiB
205 lines
4.6 KiB
10 years ago
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// Process [links](<to> "stuff")
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'use strict';
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var skipSpaces = require('../helpers').skipSpaces;
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module.exports = function links(state) {
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var oldLength,
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oldPending,
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level,
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rules,
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len,
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i,
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ok,
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found,
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labelStart,
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labelEnd,
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href,
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title,
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pos,
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code,
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isImage = false,
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max = state.posMax,
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start = state.pos,
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marker = state.src.charCodeAt(start);
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if (marker === 0x21/* ! */) {
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isImage = true;
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marker = state.src.charCodeAt(++start);
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}
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if (marker !== 0x5B/* [ */) { return false; }
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//
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// Parse link label
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//
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oldLength = state.tokens.length;
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oldPending = state.pending;
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state.pos = start + 1;
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level = 1;
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rules = state.lexer.rules;
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len = rules.length;
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while (state.pos < max) {
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marker = state.src.charCodeAt(state.pos);
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if (marker === 0x5B /* [ */) {
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level++;
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} else if (marker === 0x5D /* ] */) {
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level--;
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if (level === 0) {
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found = true;
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break;
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}
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}
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for (i = 0; i < len; i++) {
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// skip emphasis because it has lower priority, compare:
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// [foo *bar]()*
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// [foo `bar]()`
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if (rules[i].name !== 'emphasis' && rules[i] !== links) {
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ok = rules[i](state);
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}
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if (ok) { break; }
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}
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if (!ok) { state.pending += state.src[state.pos++]; }
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}
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// restore old state
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labelStart = start + 1;
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labelEnd = state.pos;
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state.pos = start;
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state.tokens.length = oldLength;
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state.pending = oldPending;
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// parser failed to find ']', so it's not a valid link
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if (!found) { return false; }
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//
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// Parse link destination and title
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//
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pos = labelEnd + 1;
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href = title = '';
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if (pos >= max || state.src.charCodeAt(pos) !== 0x28/* ( */) { return false; }
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// [link]( <href> "title" )
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// ^^ skipping these spaces
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pos++;
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if ((pos = skipSpaces(state, pos)) >= max) { return false; }
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// [link]( <href> "title" )
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// ^^^^^^ parsing link destination
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if (state.src.charCodeAt(pos) === 0x3C /* < */) {
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pos++;
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while (pos < max) {
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code = state.src.charCodeAt(pos);
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if (code === 0x0A /* \n */) { return false; }
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if (code === 0x3E /* > */) {
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pos++;
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break;
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}
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if (code === 0x5C /* \ */) {
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pos++;
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href += state.src[pos++];
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continue;
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}
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href += state.src[pos++];
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}
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} else {
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level = 0;
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while (pos < max) {
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code = state.src.charCodeAt(pos);
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if (code === 0x20) { break; }
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// ascii control characters
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if (code < 0x20 || code === 0x7F) { return false; }
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if (code === 0x5C /* \ */) {
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pos++;
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href += state.src[pos++];
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continue;
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}
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if (code === 0x28 /* ( */) {
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level++;
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if (level > 1) { return false; }
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}
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if (code === 0x29 /* ) */) {
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level--;
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if (level < 0) {
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break;
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}
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}
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href += state.src[pos++];
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}
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}
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// [link]( <href> "title" )
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// ^^ skipping these spaces
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start = pos;
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if ((pos = skipSpaces(state, pos)) >= max) { return false; }
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// [link]( <href> "title" )
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// ^^^^^^^ parsing link title
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marker = state.src.charCodeAt(pos);
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if (start !== pos) {
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if (marker === 0x22 /* " */ || marker === 0x27 /* ' */ || marker === 0x28 /* ( */) {
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pos++;
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// if opening marker is "(", switch it to closing marker ")"
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if (marker === 0x28) { marker = 0x29; }
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while (pos < max) {
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code = state.src.charCodeAt(pos);
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if (code === marker) {
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pos++;
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break;
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}
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if (code === 0x5C /* \ */) {
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pos++;
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title += state.src[pos++];
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continue;
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}
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title += state.src[pos++];
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}
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}
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}
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// [link]( <href> "title" )
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// ^^ skipping these spaces
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if ((pos = skipSpaces(state, pos)) >= max) { return false; }
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if (state.src.charCodeAt(pos) !== 0x29/* ) */) { return false; }
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//
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// We found the end of the link, and know for a fact it's a valid link;
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// so all that's left to do is to call tokenizer.
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//
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state.pos = labelStart;
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state.posMax = labelEnd;
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if (state.pending) { state.pushPending(); }
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if (isImage) {
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state.push({ type: 'image',
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src: href,
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title: title,
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alt: state.src.substr(labelStart, labelEnd - labelStart) });
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} else {
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state.push({ type: 'link_open', href: href, title: title });
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state.lexer.tokenize(state);
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state.push({ type: 'link_close' });
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}
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state.pos = pos + 1;
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state.posMax = max;
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return true;
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};
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