Initial import from local backup (Documents-Playground/pakerpale)

node_modules/fast-text-encoding/text.js

@@ -0,0 +1,187 @@
+/*
+ * Copyright 2017 Sam Thorogood. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+/**
+ * @fileoverview Polyfill for TextEncoder and TextDecoder.
+ *
+ * You probably want `text.min.js`, and not this file directly.
+ */
+
+(function(scope) {
+'use strict';
+
+// fail early
+if (scope['TextEncoder'] && scope['TextDecoder']) {
+  return false;
+}
+
+/**
+ * @constructor
+ * @param {string=} utfLabel
+ */
+function FastTextEncoder(utfLabel='utf-8') {
+  if (utfLabel !== 'utf-8') {
+    throw new RangeError(
+      `Failed to construct 'TextEncoder': The encoding label provided ('${utfLabel}') is invalid.`);
+  }
+}
+
+Object.defineProperty(FastTextEncoder.prototype, 'encoding', {value: 'utf-8'});
+
+/**
+ * @param {string} string
+ * @param {{stream: boolean}=} options
+ * @return {!Uint8Array}
+ */
+FastTextEncoder.prototype.encode = function(string, options={stream: false}) {
+  if (options.stream) {
+    throw new Error(`Failed to encode: the 'stream' option is unsupported.`);
+  }
+
+  let pos = 0;
+  const len = string.length;
+  const out = [];
+
+  let at = 0;  // output position
+  let tlen = Math.max(32, len + (len >> 1) + 7);  // 1.5x size
+  let target = new Uint8Array((tlen >> 3) << 3);  // ... but at 8 byte offset
+
+  while (pos < len) {
+    let value = string.charCodeAt(pos++);
+    if (value >= 0xd800 && value <= 0xdbff) {
+      // high surrogate
+      if (pos < len) {
+        const extra = string.charCodeAt(pos);
+        if ((extra & 0xfc00) === 0xdc00) {
+          ++pos;
+          value = ((value & 0x3ff) << 10) + (extra & 0x3ff) + 0x10000;
+        }
+      }
+      if (value >= 0xd800 && value <= 0xdbff) {
+        continue;  // drop lone surrogate
+      }
+    }
+
+    // expand the buffer if we couldn't write 4 bytes
+    if (at + 4 > target.length) {
+      tlen += 8;  // minimum extra
+      tlen *= (1.0 + (pos / string.length) * 2);  // take 2x the remaining
+      tlen = (tlen >> 3) << 3;  // 8 byte offset
+
+      const update = new Uint8Array(tlen);
+      update.set(target);
+      target = update;
+    }
+
+    if ((value & 0xffffff80) === 0) {  // 1-byte
+      target[at++] = value;  // ASCII
+      continue;
+    } else if ((value & 0xfffff800) === 0) {  // 2-byte
+      target[at++] = ((value >>  6) & 0x1f) | 0xc0;
+    } else if ((value & 0xffff0000) === 0) {  // 3-byte
+      target[at++] = ((value >> 12) & 0x0f) | 0xe0;
+      target[at++] = ((value >>  6) & 0x3f) | 0x80;
+    } else if ((value & 0xffe00000) === 0) {  // 4-byte
+      target[at++] = ((value >> 18) & 0x07) | 0xf0;
+      target[at++] = ((value >> 12) & 0x3f) | 0x80;
+      target[at++] = ((value >>  6) & 0x3f) | 0x80;
+    } else {
+      // FIXME: do we care
+      continue;
+    }
+
+    target[at++] = (value & 0x3f) | 0x80;
+  }
+
+  return target.slice(0, at);
+}
+
+/**
+ * @constructor
+ * @param {string=} utfLabel
+ * @param {{fatal: boolean}=} options
+ */
+function FastTextDecoder(utfLabel='utf-8', options={fatal: false}) {
+  if (utfLabel !== 'utf-8') {
+    throw new RangeError(
+      `Failed to construct 'TextDecoder': The encoding label provided ('${utfLabel}') is invalid.`);
+  }
+  if (options.fatal) {
+    throw new Error(`Failed to construct 'TextDecoder': the 'fatal' option is unsupported.`);
+  }
+}
+
+Object.defineProperty(FastTextDecoder.prototype, 'encoding', {value: 'utf-8'});
+
+Object.defineProperty(FastTextDecoder.prototype, 'fatal', {value: false});
+
+Object.defineProperty(FastTextDecoder.prototype, 'ignoreBOM', {value: false});
+
+/**
+ * @param {(!ArrayBuffer|!ArrayBufferView)} buffer
+ * @param {{stream: boolean}=} options
+ */
+FastTextDecoder.prototype.decode = function(buffer, options={stream: false}) {
+  if (options['stream']) {
+    throw new Error(`Failed to decode: the 'stream' option is unsupported.`);
+  }
+
+  const bytes = new Uint8Array(buffer);
+  let pos = 0;
+  const len = bytes.length;
+  const out = [];
+
+  while (pos < len) {
+    const byte1 = bytes[pos++];
+    if (byte1 === 0) {
+      break;  // NULL
+    }
+  
+    if ((byte1 & 0x80) === 0) {  // 1-byte
+      out.push(byte1);
+    } else if ((byte1 & 0xe0) === 0xc0) {  // 2-byte
+      const byte2 = bytes[pos++] & 0x3f;
+      out.push(((byte1 & 0x1f) << 6) | byte2);
+    } else if ((byte1 & 0xf0) === 0xe0) {
+      const byte2 = bytes[pos++] & 0x3f;
+      const byte3 = bytes[pos++] & 0x3f;
+      out.push(((byte1 & 0x1f) << 12) | (byte2 << 6) | byte3);
+    } else if ((byte1 & 0xf8) === 0xf0) {
+      const byte2 = bytes[pos++] & 0x3f;
+      const byte3 = bytes[pos++] & 0x3f;
+      const byte4 = bytes[pos++] & 0x3f;
+
+      // this can be > 0xffff, so possibly generate surrogates
+      let codepoint = ((byte1 & 0x07) << 0x12) | (byte2 << 0x0c) | (byte3 << 0x06) | byte4;
+      if (codepoint > 0xffff) {
+        // codepoint &= ~0x10000;
+        codepoint -= 0x10000;
+        out.push((codepoint >>> 10) & 0x3ff | 0xd800)
+        codepoint = 0xdc00 | codepoint & 0x3ff;
+      }
+      out.push(codepoint);
+    } else {
+      // FIXME: we're ignoring this
+    }
+  }
+
+  return String.fromCharCode.apply(null, out);
+}
+
+scope['TextEncoder'] = FastTextEncoder;
+scope['TextDecoder'] = FastTextDecoder;
+
+}(typeof window !== 'undefined' ? window : (typeof global !== 'undefined' ? global : this)));