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V8 Crankshaft will not inline\n//this functions if they will be situated in another module due to context switch.\n//Always perform inlining check before modifying this functions ('node --trace-inlining').\nfunction isSurrogatePair(cp1, cp2) {\n return cp1 >= 0xD800 && cp1 <= 0xDBFF && cp2 >= 0xDC00 && cp2 <= 0xDFFF;\n}\n\nfunction getSurrogatePairCodePoint(cp1, cp2) {\n return (cp1 - 0xD800) * 0x400 + 0x2400 + cp2;\n}\n\n\n//Const\nvar DEFAULT_BUFFER_WATERLINE = 1 << 16;\n\n\n//Preprocessor\n//NOTE: HTML input preprocessing\n//(see: http://www.whatwg.org/specs/web-apps/current-work/multipage/parsing.html#preprocessing-the-input-stream)\nvar Preprocessor = module.exports = function () {\n this.html = null;\n\n this.pos = -1;\n this.lastGapPos = -1;\n this.lastCharPos = -1;\n\n this.gapStack = [];\n\n this.skipNextNewLine = false;\n\n this.lastChunkWritten = false;\n this.endOfChunkHit = false;\n this.bufferWaterline = DEFAULT_BUFFER_WATERLINE;\n};\n\nPreprocessor.prototype.dropParsedChunk = function () {\n if (this.pos > this.bufferWaterline) {\n this.lastCharPos -= this.pos;\n this.html = this.html.substring(this.pos);\n this.pos = 0;\n this.lastGapPos = -1;\n this.gapStack = [];\n }\n};\n\nPreprocessor.prototype._addGap = function () {\n this.gapStack.push(this.lastGapPos);\n this.lastGapPos = this.pos;\n};\n\nPreprocessor.prototype._processHighRangeCodePoint = function (cp) {\n //NOTE: try to peek a surrogate pair\n if (this.pos !== this.lastCharPos) {\n var nextCp = this.html.charCodeAt(this.pos + 1);\n\n if (isSurrogatePair(cp, nextCp)) {\n //NOTE: we have a surrogate pair. Peek pair character and recalculate code point.\n this.pos++;\n cp = getSurrogatePairCodePoint(cp, nextCp);\n\n //NOTE: add gap that should be avoided during retreat\n this._addGap();\n }\n }\n\n // NOTE: we've hit the end of chunk, stop processing at this point\n else if (!this.lastChunkWritten) {\n this.endOfChunkHit = true;\n return $.EOF;\n }\n\n return cp;\n};\n\nPreprocessor.prototype.write = function (chunk, isLastChunk) {\n if (this.html)\n this.html += chunk;\n\n else\n this.html = chunk;\n\n this.lastCharPos = this.html.length - 1;\n this.endOfChunkHit = false;\n this.lastChunkWritten = isLastChunk;\n};\n\nPreprocessor.prototype.insertHtmlAtCurrentPos = function (chunk) {\n this.html = this.html.substring(0, this.pos + 1) +\n chunk +\n this.html.substring(this.pos + 1, this.html.length);\n\n this.lastCharPos = this.html.length - 1;\n this.endOfChunkHit = false;\n};\n\n\nPreprocessor.prototype.advance = function () {\n this.pos++;\n\n if (this.pos > this.lastCharPos) {\n if (!this.lastChunkWritten)\n this.endOfChunkHit = true;\n\n return $.EOF;\n }\n\n var cp = this.html.charCodeAt(this.pos);\n\n //NOTE: any U+000A LINE FEED (LF) characters that immediately follow a U+000D CARRIAGE RETURN (CR) character\n //must be ignored.\n if (this.skipNextNewLine && cp === $.LINE_FEED) {\n this.skipNextNewLine = false;\n this._addGap();\n return this.advance();\n }\n\n //NOTE: all U+000D CARRIAGE RETURN (CR) characters must be converted to U+000A LINE FEED (LF) characters\n if (cp === $.CARRIAGE_RETURN) {\n this.skipNextNewLine = true;\n return $.LINE_FEED;\n }\n\n this.skipNextNewLine = false;\n\n //OPTIMIZATION: first perform check if the code point in the allowed range that covers most common\n //HTML input (e.g. ASCII codes) to avoid performance-cost operations for high-range code points.\n return cp >= 0xD800 ? this._processHighRangeCodePoint(cp) : cp;\n};\n\nPreprocessor.prototype.retreat = function () {\n if (this.pos === this.lastGapPos) {\n this.lastGapPos = this.gapStack.pop();\n this.pos--;\n }\n\n this.pos--;\n};\n\n"},"lineCount":148}},"hash":"8047682b75048aa13e928180edd91429","cacheData":{"env":{}}} |