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195 lines
5.1 KiB
195 lines
5.1 KiB
'use strict';
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var normalizeReference = require('../common/utils').normalizeReference;
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var isSpace = require('../common/utils').isSpace;
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module.exports = function reference(state, startLine, _endLine, silent) {
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var ch,
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destEndPos,
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destEndLineNo,
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endLine,
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href,
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i,
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l,
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label,
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labelEnd,
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oldParentType,
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res,
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start,
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str,
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terminate,
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terminatorRules,
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title,
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lines = 0,
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pos = state.bMarks[startLine] + state.tShift[startLine],
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max = state.eMarks[startLine],
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nextLine = startLine + 1;
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if (state.src.charCodeAt(pos) !== 0x5B/* [ */) { return false; }
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// Simple check to quickly interrupt scan on [link](url) at the start of line.
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// Can be useful on practice: https://github.com/markdown-it/markdown-it/issues/54
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while (++pos < max) {
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if (state.src.charCodeAt(pos) === 0x5D /* ] */ &&
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state.src.charCodeAt(pos - 1) !== 0x5C/* \ */) {
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if (pos + 1 === max) { return false; }
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if (state.src.charCodeAt(pos + 1) !== 0x3A/* : */) { return false; }
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break;
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}
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}
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endLine = state.lineMax;
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// jump line-by-line until empty one or EOF
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terminatorRules = state.md.block.ruler.getRules('reference');
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oldParentType = state.parentType;
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state.parentType = 'reference';
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for (; nextLine < endLine && !state.isEmpty(nextLine); nextLine++) {
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// this would be a code block normally, but after paragraph
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// it's considered a lazy continuation regardless of what's there
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if (state.sCount[nextLine] - state.blkIndent > 3) { continue; }
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// quirk for blockquotes, this line should already be checked by that rule
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if (state.sCount[nextLine] < 0) { continue; }
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// Some tags can terminate paragraph without empty line.
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terminate = false;
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for (i = 0, l = terminatorRules.length; i < l; i++) {
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if (terminatorRules[i](state, nextLine, endLine, true)) {
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terminate = true;
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break;
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}
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}
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if (terminate) { break; }
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}
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str = state.getLines(startLine, nextLine, state.blkIndent, false).trim();
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max = str.length;
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for (pos = 1; pos < max; pos++) {
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ch = str.charCodeAt(pos);
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if (ch === 0x5B /* [ */) {
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return false;
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} else if (ch === 0x5D /* ] */) {
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labelEnd = pos;
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break;
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} else if (ch === 0x0A /* \n */) {
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lines++;
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} else if (ch === 0x5C /* \ */) {
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pos++;
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if (pos < max && str.charCodeAt(pos) === 0x0A) {
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lines++;
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}
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}
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}
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if (labelEnd < 0 || str.charCodeAt(labelEnd + 1) !== 0x3A/* : */) { return false; }
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// [label]: destination 'title'
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// ^^^ skip optional whitespace here
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for (pos = labelEnd + 2; pos < max; pos++) {
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ch = str.charCodeAt(pos);
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if (ch === 0x0A) {
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lines++;
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} else if (isSpace(ch)) {
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/*eslint no-empty:0*/
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} else {
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break;
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}
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}
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// [label]: destination 'title'
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// ^^^^^^^^^^^ parse this
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res = state.md.helpers.parseLinkDestination(str, pos, max);
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if (!res.ok) { return false; }
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href = state.md.normalizeLink(res.str);
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if (!state.md.validateLink(href)) { return false; }
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pos = res.pos;
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lines += res.lines;
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// save cursor state, we could require to rollback later
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destEndPos = pos;
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destEndLineNo = lines;
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// [label]: destination 'title'
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// ^^^ skipping those spaces
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start = pos;
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for (; pos < max; pos++) {
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ch = str.charCodeAt(pos);
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if (ch === 0x0A) {
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lines++;
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} else if (isSpace(ch)) {
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/*eslint no-empty:0*/
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} else {
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break;
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}
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}
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// [label]: destination 'title'
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// ^^^^^^^ parse this
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res = state.md.helpers.parseLinkTitle(str, pos, max);
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if (pos < max && start !== pos && res.ok) {
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title = res.str;
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pos = res.pos;
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lines += res.lines;
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} else {
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title = '';
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pos = destEndPos;
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lines = destEndLineNo;
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}
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// skip trailing spaces until the rest of the line
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while (pos < max) {
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ch = str.charCodeAt(pos);
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if (!isSpace(ch)) { break; }
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pos++;
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}
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if (pos < max && str.charCodeAt(pos) !== 0x0A) {
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if (title) {
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// garbage at the end of the line after title,
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// but it could still be a valid reference if we roll back
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title = '';
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pos = destEndPos;
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lines = destEndLineNo;
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while (pos < max) {
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ch = str.charCodeAt(pos);
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if (!isSpace(ch)) { break; }
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pos++;
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}
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}
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}
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if (pos < max && str.charCodeAt(pos) !== 0x0A) {
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// garbage at the end of the line
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return false;
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}
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label = normalizeReference(str.slice(1, labelEnd));
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if (!label) {
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// CommonMark 0.20 disallows empty labels
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return false;
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}
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// Reference can not terminate anything. This check is for safety only.
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/*istanbul ignore if*/
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if (silent) { return true; }
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if (typeof state.env.references === 'undefined') {
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state.env.references = {};
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}
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if (typeof state.env.references[label] === 'undefined') {
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state.env.references[label] = { title: title, href: href };
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}
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state.parentType = oldParentType;
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state.line = startLine + lines + 1;
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return true;
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};
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