antlr4ts/CodePointBuffer.js.map

ANTLR 4 runtime for JavaScript written in Typescript

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* Copyright 2016 The ANTLR Project. All rights reserved.\r\n * Licensed under the BSD-3-Clause license. See LICENSE file in the project root for license information.\r\n */\r\n\r\nimport * as assert from \"assert\";\r\nimport * as Character from \"./misc/Character\";\r\n\r\n/**\r\n * Wrapper for `Uint8Array` / `Uint16Array` / `Int32Array`.\r\n */\r\nexport class CodePointBuffer {\r\n\tprivate readonly buffer: Uint8Array | Uint16Array | Int32Array;\r\n\tprivate _position: number;\r\n\tprivate _size: number;\r\n\r\n\tconstructor(buffer: Uint8Array | Uint16Array | Int32Array, size: number) {\r\n\t\tthis.buffer = buffer;\r\n\t\tthis._position = 0;\r\n\t\tthis._size = size;\r\n\t}\r\n\r\n\tpublic static withArray(buffer: Uint8Array | Uint16Array | Int32Array): CodePointBuffer {\r\n\t\treturn new CodePointBuffer(buffer, buffer.length);\r\n\t}\r\n\r\n\tpublic get position(): number {\r\n\t\treturn this._position;\r\n\t}\r\n\r\n\tpublic set position(newPosition: number) {\r\n\t\tif (newPosition < 0 || newPosition > this._size) {\r\n\t\t\tthrow new RangeError();\r\n\t\t}\r\n\r\n\t\tthis._position = newPosition;\r\n\t}\r\n\r\n\tpublic get remaining(): number {\r\n\t\treturn this._size - this.position;\r\n\t}\r\n\r\n\tpublic get(offset: number): number {\r\n\t\treturn this.buffer[offset];\r\n\t}\r\n\r\n\tpublic array(): Uint8Array | Uint16Array | Int32Array {\r\n\t\treturn this.buffer.slice(0, this._size);\r\n\t}\r\n\r\n\tpublic static builder(initialBufferSize: number): CodePointBuffer.Builder {\r\n\t\treturn new CodePointBuffer.Builder(initialBufferSize);\r\n\t}\r\n}\r\n\r\nexport namespace CodePointBuffer {\r\n\tconst enum Type {\r\n\t\tBYTE,\r\n\t\tCHAR,\r\n\t\tINT,\r\n\t}\r\n\r\n\texport class Builder {\r\n\t\tprivate type: Type;\r\n\t\tprivate buffer: Uint8Array | Uint16Array | Int32Array;\r\n\t\tprivate prevHighSurrogate: number;\r\n\t\tprivate position: number;\r\n\r\n\t\tconstructor(initialBufferSize: number) {\r\n\t\t\tthis.type = Type.BYTE;\r\n\t\t\tthis.buffer = new Uint8Array(initialBufferSize);\r\n\t\t\tthis.prevHighSurrogate = -1;\r\n\t\t\tthis.position = 0;\r\n\t\t}\r\n\r\n\t\tpublic build(): CodePointBuffer {\r\n\t\t\treturn new CodePointBuffer(this.buffer, this.position);\r\n\t\t}\r\n\r\n\t\tprivate static roundUpToNextPowerOfTwo(i: number): number {\r\n\t\t\tlet nextPowerOfTwo: number = 32 - Math.clz32(i - 1);\r\n\t\t\treturn Math.pow(2, nextPowerOfTwo);\r\n\t\t}\r\n\r\n\t\tpublic ensureRemaining(remainingNeeded: number): void {\r\n\t\t\tswitch (this.type) {\r\n\t\t\t\tcase Type.BYTE:\r\n\t\t\t\t\tif (this.buffer.length - this.position < remainingNeeded) {\r\n\t\t\t\t\t\tlet newCapacity: number = Builder.roundUpToNextPowerOfTwo(this.buffer.length + remainingNeeded);\r\n\t\t\t\t\t\tlet newBuffer: Uint8Array = new Uint8Array(newCapacity);\r\n\t\t\t\t\t\tnewBuffer.set(this.buffer.subarray(0, this.position), 0);\r\n\t\t\t\t\t\tthis.buffer = newBuffer;\r\n\t\t\t\t\t}\r\n\t\t\t\t\tbreak;\r\n\t\t\t\tcase Type.CHAR:\r\n\t\t\t\t\tif (this.buffer.length - this.position < remainingNeeded) {\r\n\t\t\t\t\t\tlet newCapacity: number = Builder.roundUpToNextPowerOfTwo(this.buffer.length + remainingNeeded);\r\n\t\t\t\t\t\tlet newBuffer: Uint16Array = new Uint16Array(newCapacity);\r\n\t\t\t\t\t\tnewBuffer.set(this.buffer.subarray(0, this.position), 0);\r\n\t\t\t\t\t\tthis.buffer = newBuffer;\r\n\t\t\t\t\t}\r\n\t\t\t\t\tbreak;\r\n\t\t\t\tcase Type.INT:\r\n\t\t\t\t\tif (this.buffer.length - this.position < remainingNeeded) {\r\n\t\t\t\t\t\tlet newCapacity: number = Builder.roundUpToNextPowerOfTwo(this.buffer.length + remainingNeeded);\r\n\t\t\t\t\t\tlet newBuffer: Int32Array = new Int32Array(newCapacity);\r\n\t\t\t\t\t\tnewBuffer.set(this.buffer.subarray(0, this.position), 0);\r\n\t\t\t\t\t\tthis.buffer = newBuffer;\r\n\t\t\t\t\t}\r\n\t\t\t\t\tbreak;\r\n\t\t\t}\r\n\t\t}\r\n\r\n\t\tpublic append(utf16In: Uint16Array): void {\r\n\t\t\tthis.ensureRemaining(utf16In.length);\r\n\t\t\tthis.appendArray(utf16In);\r\n\t\t}\r\n\r\n\t\tprivate appendArray(utf16In: Uint16Array): void {\r\n\t\t\tswitch (this.type) {\r\n\t\t\t\tcase Type.BYTE:\r\n\t\t\t\t\tthis.appendArrayByte(utf16In);\r\n\t\t\t\t\tbreak;\r\n\t\t\t\tcase Type.CHAR:\r\n\t\t\t\t\tthis.appendArrayChar(utf16In);\r\n\t\t\t\t\tbreak;\r\n\t\t\t\tcase Type.INT:\r\n\t\t\t\t\tthis.appendArrayInt(utf16In);\r\n\t\t\t\t\tbreak;\r\n\t\t\t}\r\n\t\t}\r\n\r\n\t\tprivate appendArrayByte(utf16In: Uint16Array): void {\r\n\t\t\tassert(this.prevHighSurrogate === -1);\r\n\r\n\t\t\tlet input: Uint16Array = utf16In;\r\n\t\t\tlet inOffset: number = 0;\r\n\t\t\tlet inLimit: number = utf16In.length;\r\n\r\n\t\t\tlet outByte = this.buffer;\r\n\t\t\tlet outOffset: number = this.position;\r\n\r\n\t\t\twhile (inOffset < inLimit) {\r\n\t\t\t\tlet c: number = input[inOffset];\r\n\t\t\t\tif (c <= 0xFF) {\r\n\t\t\t\t\toutByte[outOffset] = c;\r\n\t\t\t\t} else {\r\n\t\t\t\t\tutf16In = utf16In.subarray(inOffset, inLimit);\r\n\t\t\t\t\tthis.position = outOffset;\r\n\t\t\t\t\tif (!Character.isHighSurrogate(c)) {\r\n\t\t\t\t\t\tthis.byteToCharBuffer(utf16In.length);\r\n\t\t\t\t\t\tthis.appendArrayChar(utf16In);\r\n\t\t\t\t\t\treturn;\r\n\t\t\t\t\t} else {\r\n\t\t\t\t\t\tthis.byteToIntBuffer(utf16In.length);\r\n\t\t\t\t\t\tthis.appendArrayInt(utf16In);\r\n\t\t\t\t\t\treturn;\r\n\t\t\t\t\t}\r\n\t\t\t\t}\r\n\r\n\t\t\t\tinOffset++;\r\n\t\t\t\toutOffset++;\r\n\t\t\t}\r\n\r\n\t\t\tthis.position = outOffset;\r\n\t\t}\r\n\r\n\t\tprivate appendArrayChar(utf16In: Uint16Array): void {\r\n\t\t\tassert(this.prevHighSurrogate === -1);\r\n\r\n\t\t\tlet input: Uint16Array = utf16In;\r\n\t\t\tlet inOffset: number = 0;\r\n\t\t\tlet inLimit: number = utf16In.length;\r\n\r\n\t\t\tlet outChar = this.buffer;\r\n\t\t\tlet outOffset: number = this.position;\r\n\r\n\t\t\twhile (inOffset < inLimit) {\r\n\t\t\t\tlet c: number = input[inOffset];\r\n\t\t\t\tif (!Character.isHighSurrogate(c)) {\r\n\t\t\t\t\toutChar[outOffset] = c;\r\n\t\t\t\t} else {\r\n\t\t\t\t\tutf16In = utf16In.subarray(inOffset, inLimit);\r\n\t\t\t\t\tthis.position = outOffset;\r\n\t\t\t\t\tthis.charToIntBuffer(utf16In.length);\r\n\t\t\t\t\tthis.appendArrayInt(utf16In);\r\n\t\t\t\t\treturn;\r\n\t\t\t\t}\r\n\r\n\t\t\t\tinOffset++;\r\n\t\t\t\toutOffset++;\r\n\t\t\t}\r\n\r\n\t\t\tthis.position = outOffset;\r\n\t\t}\r\n\r\n\t\tprivate appendArrayInt(utf16In: Uint16Array): void {\r\n\t\t\tlet input: Uint16Array = utf16In;\r\n\t\t\tlet inOffset: number = 0;\r\n\t\t\tlet inLimit: number = utf16In.length;\r\n\r\n\t\t\tlet outInt = this.buffer;\r\n\t\t\tlet outOffset = this.position;\r\n\r\n\t\t\twhile (inOffset < inLimit) {\r\n\t\t\t\tlet c: number = input[inOffset];\r\n\t\t\t\tinOffset++;\r\n\t\t\t\tif (this.prevHighSurrogate !== -1) {\r\n\t\t\t\t\tif (Character.isLowSurrogate(c)) {\r\n\t\t\t\t\t\toutInt[outOffset] = String.fromCharCode(this.prevHighSurrogate, c).codePointAt(0)!;\r\n\t\t\t\t\t\toutOffset++;\r\n\t\t\t\t\t\tthis.prevHighSurrogate = -1;\r\n\t\t\t\t\t} else {\r\n\t\t\t\t\t\t// Dangling high surrogate\r\n\t\t\t\t\t\toutInt[outOffset] = this.prevHighSurrogate;\r\n\t\t\t\t\t\toutOffset++;\r\n\t\t\t\t\t\tif (Character.isHighSurrogate(c)) {\r\n\t\t\t\t\t\t\tthis.prevHighSurrogate = c;\r\n\t\t\t\t\t\t} else {\r\n\t\t\t\t\t\t\toutInt[outOffset] = c;\r\n\t\t\t\t\t\t\toutOffset++;\r\n\t\t\t\t\t\t\tthis.prevHighSurrogate = -1;\r\n\t\t\t\t\t\t}\r\n\t\t\t\t\t}\r\n\t\t\t\t} else if (Character.isHighSurrogate(c)) {\r\n\t\t\t\t\tthis.prevHighSurrogate = c;\r\n\t\t\t\t} else {\r\n\t\t\t\t\toutInt[outOffset] = c;\r\n\t\t\t\t\toutOffset++;\r\n\t\t\t\t}\r\n\t\t\t}\r\n\r\n\t\t\tif (this.prevHighSurrogate !== -1) {\r\n\t\t\t\t// Dangling high surrogate\r\n\t\t\t\toutInt[outOffset] = this.prevHighSurrogate;\r\n\t\t\t\toutOffset++;\r\n\t\t\t}\r\n\r\n\t\t\tthis.position = outOffset;\r\n\t\t}\r\n\r\n\t\tprivate byteToCharBuffer(toAppend: number): void {\r\n\t\t\t// CharBuffers hold twice as much per unit as ByteBuffers, so start with half the capacity.\r\n\t\t\tlet newBuffer: Uint16Array = new Uint16Array(Math.max(this.position + toAppend, this.buffer.length >> 1));\r\n\t\t\tnewBuffer.set(this.buffer.subarray(0, this.position), 0);\r\n\r\n\t\t\tthis.type = Type.CHAR;\r\n\t\t\tthis.buffer = newBuffer;\r\n\t\t}\r\n\r\n\t\tprivate byteToIntBuffer(toAppend: number): void {\r\n\t\t\t// IntBuffers hold four times as much per unit as ByteBuffers, so start with one quarter the capacity.\r\n\t\t\tlet newBuffer: Int32Array = new Int32Array(Math.max(this.position + toAppend, this.buffer.length >> 2));\r\n\t\t\tnewBuffer.set(this.buffer.subarray(0, this.position), 0);\r\n\r\n\t\t\tthis.type = Type.INT;\r\n\t\t\tthis.buffer = newBuffer;\r\n\t\t}\r\n\r\n\t\tprivate charToIntBuffer(toAppend: number): void {\r\n\t\t\t// IntBuffers hold two times as much per unit as ByteBuffers, so start with one half the capacity.\r\n\t\t\tlet newBuffer: Int32Array = new Int32Array(Math.max(this.position + toAppend, this.buffer.length >> 1));\r\n\t\t\tnewBuffer.set(this.buffer.subarray(0, this.position), 0);\r\n\r\n\t\t\tthis.type = Type.INT;\r\n\t\t\tthis.buffer = newBuffer;\r\n\t\t}\r\n\t}\r\n}\r\n"]}