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82 lines
1.6 KiB
82 lines
1.6 KiB
// Parse link destination |
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// |
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'use strict'; |
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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 */) { return result; } |
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if (code === 0x3C /* < */) { 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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if (str.charCodeAt(pos + 1) === 0x20) { break; } |
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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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if (level > 32) { return result; } |
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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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