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92 lines
2.9 KiB
JavaScript
92 lines
2.9 KiB
JavaScript
// Generated by CoffeeScript 1.7.1
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var UnicodeTrie, inflate;
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inflate = require('tiny-inflate');
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UnicodeTrie = (function() {
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var DATA_BLOCK_LENGTH, DATA_GRANULARITY, DATA_MASK, INDEX_1_OFFSET, INDEX_2_BLOCK_LENGTH, INDEX_2_BMP_LENGTH, INDEX_2_MASK, INDEX_SHIFT, LSCP_INDEX_2_LENGTH, LSCP_INDEX_2_OFFSET, OMITTED_BMP_INDEX_1_LENGTH, SHIFT_1, SHIFT_1_2, SHIFT_2, UTF8_2B_INDEX_2_LENGTH, UTF8_2B_INDEX_2_OFFSET;
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SHIFT_1 = 6 + 5;
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SHIFT_2 = 5;
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SHIFT_1_2 = SHIFT_1 - SHIFT_2;
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OMITTED_BMP_INDEX_1_LENGTH = 0x10000 >> SHIFT_1;
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INDEX_2_BLOCK_LENGTH = 1 << SHIFT_1_2;
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INDEX_2_MASK = INDEX_2_BLOCK_LENGTH - 1;
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INDEX_SHIFT = 2;
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DATA_BLOCK_LENGTH = 1 << SHIFT_2;
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DATA_MASK = DATA_BLOCK_LENGTH - 1;
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LSCP_INDEX_2_OFFSET = 0x10000 >> SHIFT_2;
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LSCP_INDEX_2_LENGTH = 0x400 >> SHIFT_2;
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INDEX_2_BMP_LENGTH = LSCP_INDEX_2_OFFSET + LSCP_INDEX_2_LENGTH;
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UTF8_2B_INDEX_2_OFFSET = INDEX_2_BMP_LENGTH;
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UTF8_2B_INDEX_2_LENGTH = 0x800 >> 6;
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INDEX_1_OFFSET = UTF8_2B_INDEX_2_OFFSET + UTF8_2B_INDEX_2_LENGTH;
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DATA_GRANULARITY = 1 << INDEX_SHIFT;
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function UnicodeTrie(data) {
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var isBuffer, uncompressedLength, view;
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isBuffer = typeof data.readUInt32BE === 'function' && typeof data.slice === 'function';
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if (isBuffer || data instanceof Uint8Array) {
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if (isBuffer) {
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this.highStart = data.readUInt32BE(0);
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this.errorValue = data.readUInt32BE(4);
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uncompressedLength = data.readUInt32BE(8);
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data = data.slice(12);
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} else {
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view = new DataView(data.buffer);
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this.highStart = view.getUint32(0);
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this.errorValue = view.getUint32(4);
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uncompressedLength = view.getUint32(8);
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data = data.subarray(12);
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}
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data = inflate(data, new Uint8Array(uncompressedLength));
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data = inflate(data, new Uint8Array(uncompressedLength));
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this.data = new Uint32Array(data.buffer);
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} else {
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this.data = data.data, this.highStart = data.highStart, this.errorValue = data.errorValue;
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}
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}
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UnicodeTrie.prototype.get = function(codePoint) {
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var index;
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if (codePoint < 0 || codePoint > 0x10ffff) {
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return this.errorValue;
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}
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if (codePoint < 0xd800 || (codePoint > 0xdbff && codePoint <= 0xffff)) {
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index = (this.data[codePoint >> SHIFT_2] << INDEX_SHIFT) + (codePoint & DATA_MASK);
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return this.data[index];
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}
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if (codePoint <= 0xffff) {
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index = (this.data[LSCP_INDEX_2_OFFSET + ((codePoint - 0xd800) >> SHIFT_2)] << INDEX_SHIFT) + (codePoint & DATA_MASK);
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return this.data[index];
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}
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if (codePoint < this.highStart) {
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index = this.data[(INDEX_1_OFFSET - OMITTED_BMP_INDEX_1_LENGTH) + (codePoint >> SHIFT_1)];
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index = this.data[index + ((codePoint >> SHIFT_2) & INDEX_2_MASK)];
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index = (index << INDEX_SHIFT) + (codePoint & DATA_MASK);
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return this.data[index];
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}
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return this.data[this.data.length - DATA_GRANULARITY];
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};
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return UnicodeTrie;
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})();
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module.exports = UnicodeTrie;
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