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67 lines
2.0 KiB
67 lines
2.0 KiB
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'use strict';
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var StateInline = require('./rules_inline/state_inline');
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var parseLinkLabel = require('./links').parseLinkLabel;
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var parseLinkDestination = require('./links').parseLinkDestination;
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var parseLinkTitle = require('./links').parseLinkTitle;
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var normalizeReference = require('./links').normalizeReference;
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// Parse link reference definition.
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//
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module.exports = function parse_reference(str, parser, options, env) {
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var state, labelEnd, pos, max, code, start, href, title, label;
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if (str.charCodeAt(0) !== 0x5B/* [ */) { return -1; }
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if (str.indexOf(']:') === -1) { return -1; }
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state = new StateInline(str, parser, options, env);
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labelEnd = parseLinkLabel(state, 0);
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if (labelEnd < 0 || str.charCodeAt(labelEnd + 1) !== 0x3A/* : */) { return -1; }
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max = state.posMax;
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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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code = state.src.charCodeAt(pos);
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if (code !== 0x20 && code !== 0x0A) { break; }
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}
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// [label]: destination 'title'
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// ^^^^^^^^^^^ parse this
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if (!parseLinkDestination(state, pos)) { return -1; }
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href = state.linkContent;
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pos = state.pos;
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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 = pos + 1; pos < max; pos++) {
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code = state.src.charCodeAt(pos);
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if (code !== 0x20 && code !== 0x0A) { break; }
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}
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// [label]: destination 'title'
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// ^^^^^^^ parse this
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if (pos < max && start !== pos && parseLinkTitle(state, pos)) {
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title = state.linkContent;
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pos = state.pos;
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} else {
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title = '';
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pos = start;
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}
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// ensure that the end of the line is empty
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while (pos < max && state.src.charCodeAt(pos) === 0x20/* space */) { pos++; }
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if (pos < max && state.src.charCodeAt(pos) !== 0x0A) { return -1; }
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label = normalizeReference(str.slice(1, labelEnd));
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env.references[label] = env.references[label] || { title: title, href: href };
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return pos;
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};
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