81 lines
1.6 KiB
JavaScript
81 lines
1.6 KiB
JavaScript
// Parse link destination
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//
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'use strict';
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var isSpace = require('../common/utils').isSpace;
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var unescapeAll = require('../common/utils').unescapeAll;
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module.exports = function parseLinkDestination(str, pos, max) {
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var code, level,
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lines = 0,
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start = pos,
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result = {
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ok: false,
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pos: 0,
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lines: 0,
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str: ''
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};
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if (str.charCodeAt(pos) === 0x3C /* < */) {
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pos++;
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while (pos < max) {
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code = str.charCodeAt(pos);
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if (code === 0x0A /* \n */ || isSpace(code)) { return result; }
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if (code === 0x3E /* > */) {
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result.pos = pos + 1;
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result.str = unescapeAll(str.slice(start + 1, pos));
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result.ok = true;
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return result;
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}
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if (code === 0x5C /* \ */ && pos + 1 < max) {
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pos += 2;
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continue;
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}
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pos++;
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}
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// no closing '>'
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return result;
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}
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// this should be ... } else { ... branch
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level = 0;
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while (pos < max) {
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code = str.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) { break; }
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if (code === 0x5C /* \ */ && pos + 1 < max) {
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pos += 2;
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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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}
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if (code === 0x29 /* ) */) {
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if (level === 0) { break; }
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level--;
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}
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pos++;
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}
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if (start === pos) { return result; }
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if (level !== 0) { return result; }
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result.str = unescapeAll(str.slice(start, pos));
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result.lines = lines;
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result.pos = pos;
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result.ok = true;
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return result;
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};
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