rewrite to polyfill of TextEncoder/TextDecoder

tetherto · Sep 1, 2017 · 1ea7660 · 1ea7660
1 parent 093aae9
commit 1ea7660
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Showing 3 changed files with 225 additions and 159 deletions.
diff --git a/js-utf.js b/js-utf.js
diff --git a/test.html b/test.html
@@ -9,14 +9,35 @@
   import 'https://cdn.rawgit.com/inexorabletash/text-encoding/b98ab30b/lib/encoding.js';
   const polyfill = module.exports;
 
-  import * as utf from './js-utf.js';
+  import './text.js';
 
-  const runs = 100;
+  const runs = 1;
   const dataUrl = './utf8_sequence_0-0xffff_assigned_printable.txt';
 
   (async function() {
     let text = await window.fetch(dataUrl).then((data) => data.text());
     text = text.substr(0, 10000);
+
+    function testEncodeDecode(name, tenc, tdec) {
+      console.time(name + '.TextEncoder');
+      let saved;
+      const encoder = new tenc();
+      for (let i = 0; i < runs; ++i) {
+        const out = encoder.encode(text);
+        saved = out;
+      }
+      console.info('got output', saved);
+      console.timeEnd(name + '.TextEncoder');
+
+      console.time(name + '.TextDecoder');
+      const decoder = new tdec();
+      for (let i = 0; i < runs; ++i) {
+        const out = decoder.decode(saved);
+        output = out;
+      }
+      console.timeEnd(name + '.TextDecoder');
+    }
+
     let saved, output;
 
     console.time('utf8.encode');
@@ -36,63 +57,10 @@
       throw new Error('utf8 got wrong answer');
     }
 
-    console.time('js-utf.encode');
-    const out = new Uint8Array(1024 * 1024);
-    for (let i = 0; i < runs; ++i) {
-      const len = utf.encode(text, out);
-      saved = out.slice(0, len);
-    }
-    console.timeEnd('js-utf.encode');
-    console.info(saved);
-    const polyfillSaved = saved;
-
-    console.time('js-utf.decode');
-    for (let i = 0; i < runs; ++i) {
-      const out = utf.decode(saved);
-      output = out;
-    }
-    console.timeEnd('js-utf.decode');
-    if (output !== text) {
-      console.info('expected output length', text.length, 'was', output.length);
-      throw new Error('js-utf got wrong answer');
-    }
-
-
-    console.time('TextEncoder');
-    const encoder = new TextEncoder();
-    for (let i = 0; i < runs; ++i) {
-      const out = encoder.encode(text);
-      saved = out;
-    }
-    console.timeEnd('TextEncoder');
-    console.info(saved);
-
-    console.time('TextDecoder');
-    const decoder = new TextDecoder();
-    for (let i = 0; i < runs; ++i) {
-      const out = decoder.decode(polyfillSaved);
-      output = out;
-    }
-    console.timeEnd('TextDecoder');
-
-
-    console.time('polyfill.TextEncoder');
-    const encoderP = new polyfill.TextEncoder();
-    for (let i = 0; i < runs; ++i) {
-      const out = encoderP.encode(text);
-      saved = out;
-    }
-    console.timeEnd('polyfill.TextEncoder');
-    console.info(saved);
-
-    console.time('polyfill.TextDecoder');
-    const decoderP = new polyfill.TextDecoder();
-    for (let i = 0; i < runs; ++i) {
-      const out = decoderP.decode(polyfillSaved);
-      output = out;
-    }
-    console.timeEnd('polyfill.TextDecoder');
 
+    testEncodeDecode('native', TextEncoder, TextDecoder);
+    testEncodeDecode('fast', TextEncoderPolyfill, TextDecoderPolyfill);
+    testEncodeDecode('polyfill', polyfill.TextEncoder, polyfill.TextDecoder);
 
   }());