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198 lines
5.2 KiB
198 lines
5.2 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 it's indented more than 3 spaces, it should be a code block |
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if (state.sCount[startLine] - state.blkIndent >= 4) { return false; } |
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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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