Implement word wrapping and panning in multiline Braille.

chrome/browser/resources/chromeos/chromevox/braille/pan_strategy_test.unitjs

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 GEN_INCLUDE(['../testing/chromevox_unittest_base.js']);
 
 /**
  * Test fixture.
  * @constructor
  * @extends {ChromeVoxUnitTestBase}
  */
 function CvoxPanStrategyUnitTest() {}
 
 CvoxPanStrategyUnitTest.prototype = {
   __proto__: ChromeVoxUnitTestBase.prototype,
 
   /** @override */
   closureModuleDeps: [
     'cvox.PanStrategy',
   ],
+
+
 };
 
 /**
- * @param {string} content String representing the content with spaces
- *     representing blank cells and any other character representing
- *     arbitrary non-blank cells.
+ * Creates an array buffer based off of the passed in content.
+ * Note: Input should be a string of numbers, spaces will turn to 0's.
+ * @param {string} content String representing the content.
  */
 function createArrayBuffer(content) {
   var result = new ArrayBuffer(content.length);
   var view = new Uint8Array(result);
   for (var i = 0; i < content.length; ++i) {
-    view[i] = (content[i] != ' ' ? 1 : 0);
+    view[i] = content[i];
   }
   return result;
 }
 
  TEST_F('CvoxPanStrategyUnitTest', 'FixedPanning', function() {
-  var panner = new cvox.FixedPanStrategy();
-
-  panner.setDisplaySize(0);
-  panner.setContent(createArrayBuffer(''), 0);
-  assertEqualsJSON({start: 0, end: 0}, panner.viewPort);
+  var panner = new cvox.PanStrategy();
+  panner.setPanStrategy(false);
+
+  panner.setDisplaySize(0, 0);
+  panner.setContent('', createArrayBuffer(''), [], 0);
+  assertEqualsJSON({firstRow: 0, lastRow: 0}, panner.viewPort);
   assertFalse(panner.previous());
   assertFalse(panner.next());
 
   // 25 cells with a blank cell in the first 10 characters.
-  var content = createArrayBuffer('01234567 9012345678901234');
-  panner.setContent(content, 0);
-  assertEqualsJSON({start: 0, end: 0}, panner.viewPort);
-  assertFalse(panner.next());
-  assertFalse(panner.previous());
-
-  panner.setDisplaySize(10);
-  assertEqualsJSON({start: 0, end: 10}, panner.viewPort);
-  assertTrue(panner.next());
-  assertEqualsJSON({start: 10, end: 20}, panner.viewPort);
-  assertTrue(panner.next());
-  assertEqualsJSON({start: 20, end: 25}, panner.viewPort);
-  assertFalse(panner.next());
-  assertEqualsJSON({start: 20, end: 25}, panner.viewPort);
-  assertTrue(panner.previous());
-  assertEqualsJSON({start: 10, end: 20}, panner.viewPort);
-  assertTrue(panner.previous());
-  assertEqualsJSON({start: 0, end: 10}, panner.viewPort);
-
-  panner.setContent(content, 19);
-  assertEqualsJSON({start: 10, end: 20}, panner.viewPort);
-
-  panner.setContent(content, 20);
-  assertEqualsJSON({start: 20, end: 25}, panner.viewPort);
-
-  panner.setDisplaySize(8);
-  assertEqualsJSON({start: 16, end: 24}, panner.viewPort);
-
-  panner.viewPort_ = {start: 2, end: 10};
-  assertTrue(panner.previous());
-  assertEqualsJSON({start: 0, end: 8}, panner.viewPort);
-});
-
-TEST_F('CvoxPanStrategyUnitTest', 'WrappedPanning', function() {
-  var panner = new cvox.WrappingPanStrategy();
+  var translatedContent = createArrayBuffer('01234567 9012345678901234');
+  panner.setContent('unused', translatedContent, [], 0);
+  assertEqualsJSON({firstRow: 0, lastRow: 0}, panner.viewPort);
+  assertFalse(panner.next());
+  assertFalse(panner.previous());
+
+  panner.setDisplaySize(1, 10);
+  assertEquals(panner.displaySize.columns, 10);
+  assertEqualsJSON({firstRow: 0, lastRow: 0}, panner.viewPort);
+  assertTrue(panner.next());
+  assertEqualsJSON({firstRow: 1, lastRow: 1}, panner.viewPort);
+  assertTrue(panner.next());
+  assertEqualsJSON({firstRow: 2, lastRow: 2}, panner.viewPort);
+  assertFalse(panner.next());
+  assertEqualsJSON({firstRow: 2, lastRow: 2}, panner.viewPort);
+  assertTrue(panner.previous());
+  assertEqualsJSON({firstRow: 1, lastRow: 1}, panner.viewPort);
+  assertTrue(panner.previous());
+  assertEqualsJSON({firstRow: 0, lastRow: 0}, panner.viewPort);
+
+  panner.setContent('a', translatedContent, [], 19);
+  assertEqualsJSON({firstRow: 1, lastRow: 1}, panner.viewPort);
+
+  panner.setContent('a', translatedContent, [], 20);
+  assertEqualsJSON({firstRow: 2, lastRow: 2}, panner.viewPort);
+
+  panner.setDisplaySize(1, 8);
+  assertEqualsJSON({firstRow: 0, lastRow: 0}, panner.viewPort);
+
+  // Test Multi-line Panning.
+  panner.setDisplaySize(2, 10);
+  assertEqualsJSON({firstRow: 0, lastRow: 1}, panner.viewPort);
+  assertTrue(panner.next());
+  assertEqualsJSON({firstRow: 2, lastRow: 2}, panner.viewPort);
+  assertFalse(panner.next());
+  assertEqualsJSON({firstRow: 2, lastRow: 2}, panner.viewPort);
+  assertTrue(panner.previous());
+  assertEqualsJSON({firstRow: 0, lastRow: 1}, panner.viewPort);
+  assertFalse(panner.previous());
+  assertEqualsJSON({firstRow: 0, lastRow: 1}, panner.viewPort);
+});
+
+TEST_F('CvoxPanStrategyUnitTest', 'WrappedPanningSingleLine', function() {
+  var panner = new cvox.PanStrategy();
+  panner.setPanStrategy(true);
 
   // 30 cells with blank cells at positions 8, 22 and 26.
-  var content = createArrayBuffer('01234567 9012345678901 345 789');
-  panner.setContent(content, 0);
-  assertEqualsJSON({start: 0, end: 0}, panner.viewPort);
-  assertFalse(panner.next());
-  assertFalse(panner.previous());
-
-  panner.setDisplaySize(10);
-  assertEqualsJSON({start: 0, end: 9}, panner.viewPort);
-  assertTrue(panner.next());
-  assertEqualsJSON({start: 9, end: 19}, panner.viewPort);
-  assertTrue(panner.next());
-  assertEqualsJSON({start: 19, end: 27}, panner.viewPort);
-  assertTrue(panner.next());
-  assertEqualsJSON({start: 27, end: 30}, panner.viewPort);
-  assertFalse(panner.next());
-  assertEqualsJSON({start: 27, end: 30}, panner.viewPort);
-  assertTrue(panner.previous());
-  assertEqualsJSON({start: 23, end: 27}, panner.viewPort);
-  assertTrue(panner.previous());
-  assertEqualsJSON({start: 13, end: 23}, panner.viewPort);
-  assertTrue(panner.previous());
-  assertEqualsJSON({start: 9, end: 13}, panner.viewPort);
-  assertTrue(panner.previous());
-  assertEqualsJSON({start: 0, end: 9}, panner.viewPort);
-
-  panner.setContent(content, 21);
-  assertEqualsJSON({start: 19, end: 27}, panner.viewPort);
-
-  panner.setContent(content, 30);
-  assertEqualsJSON({start: 27, end: 30}, panner.viewPort);
-
-  panner.setDisplaySize(8);
-  assertEqualsJSON({start: 23, end: 30}, panner.viewPort);
-
-  panner.viewPort_ = {start: 2, end: 10};
-  assertTrue(panner.previous());
-  assertEqualsJSON({start: 0, end: 8}, panner.viewPort);
-});
+  var content = createArrayBuffer('11234567 9112345678911 345 789');
+  panner.setContent('a', content, [], 0);
+  assertEqualsJSON({firstRow: 0, lastRow: 0}, panner.viewPort);
+  assertFalse(panner.next());
+  assertFalse(panner.previous());
+
+  panner.setDisplaySize(1, 10);
+  assertEqualsJSON({firstRow: 0, lastRow: 0}, panner.viewPort);
+  assertArrayBuffersEquals(createArrayBuffer('11234567  '),
+        panner.getCurrentBrailleViewportContents());
+  assertTrue(panner.next());
+  assertEqualsJSON({firstRow: 1, lastRow: 1}, panner.viewPort);
+  assertArrayBuffersEquals(createArrayBuffer('9112345678'),
+        panner.getCurrentBrailleViewportContents());
+  assertTrue(panner.next());
+  assertEqualsJSON({firstRow: 2, lastRow: 2}, panner.viewPort);
+  assertArrayBuffersEquals(createArrayBuffer('911 345   '),
+        panner.getCurrentBrailleViewportContents());
+  assertTrue(panner.next());
+  assertEqualsJSON({firstRow: 3, lastRow: 3}, panner.viewPort);
+  assertArrayBuffersEquals(createArrayBuffer('789'),
+        panner.getCurrentBrailleViewportContents());
+  assertFalse(panner.next());
+  assertEqualsJSON({firstRow: 3, lastRow: 3}, panner.viewPort);
+  assertTrue(panner.previous());
+  assertEqualsJSON({firstRow: 2, lastRow: 2}, panner.viewPort);
+  assertTrue(panner.previous());
+  assertEqualsJSON({firstRow: 1, lastRow: 1}, panner.viewPort);
+  assertTrue(panner.previous());
+  assertEqualsJSON({firstRow: 0, lastRow: 0}, panner.viewPort);
+  assertFalse(panner.previous());
+
+  panner.setContent('a', content, [], 21);
+  assertEqualsJSON({firstRow: 2, lastRow: 2}, panner.viewPort);
+  assertArrayBuffersEquals(createArrayBuffer('911 345   '),
+        panner.getCurrentBrailleViewportContents());
+
+  panner.setContent('a', content, [], 30);
+  assertEqualsJSON({firstRow: 3, lastRow: 3}, panner.viewPort);
+  assertArrayBuffersEquals(createArrayBuffer('789'),
+        panner.getCurrentBrailleViewportContents());
+
+  panner.setDisplaySize(1, 8);
+  assertEqualsJSON({firstRow: 0, lastRow: 0}, panner.viewPort);
+  assertArrayBuffersEquals(createArrayBuffer('11234567'),
+        panner.getCurrentBrailleViewportContents());
+});
+
+TEST_F('CvoxPanStrategyUnitTest', 'WrappedPanningMultiline', function() {
+  var panner = new cvox.PanStrategy();
+  panner.setPanStrategy(true);
+
+  // 30 cells with blank cells at positions 8, 22 and 26.
+  var content = createArrayBuffer('11234567 9112345678911 345 789');
+  panner.setContent('a', content, [], 0);
+
+  panner.setDisplaySize(2, 10);
+  assertEqualsJSON({firstRow: 0, lastRow: 1}, panner.viewPort);
+  assertArrayBuffersEquals(createArrayBuffer('11234567  9112345678'),
+        panner.getCurrentBrailleViewportContents());
+  assertTrue(panner.next());
+  assertEqualsJSON({firstRow: 2, lastRow: 3}, panner.viewPort);
+  assertArrayBuffersEquals(createArrayBuffer('911 345   789'),
+        panner.getCurrentBrailleViewportContents());
+  assertFalse(panner.next());
+  assertEqualsJSON({firstRow: 2, lastRow: 3}, panner.viewPort);
+  assertArrayBuffersEquals(createArrayBuffer('911 345   789'),
+        panner.getCurrentBrailleViewportContents());
+  assertTrue(panner.previous());
+  assertEqualsJSON({firstRow: 0, lastRow: 1}, panner.viewPort);
+  assertArrayBuffersEquals(createArrayBuffer('11234567  9112345678'),
+        panner.getCurrentBrailleViewportContents());
+  assertFalse(panner.previous());
+  assertEqualsJSON({firstRow: 0, lastRow: 1}, panner.viewPort);
+  assertArrayBuffersEquals(createArrayBuffer('11234567  9112345678'),
+        panner.getCurrentBrailleViewportContents());
+});
+
+TEST_F('CvoxPanStrategyUnitTest', 'FixedSetContent', function() {
+  var panner = new cvox.PanStrategy();
+  panner.setPanStrategy(false);
+
+  var textContent = "ABCDE FGHI"
+  var translatedContent = createArrayBuffer('11234 6789');
+  var mapping = [0,1,2,3,4,5,6,7,8,9];
+  panner.setDisplaySize(1, 5);
+  panner.setContent(textContent, translatedContent,
+    mapping, 0);
+  var expectedBufferValue = translatedContent;
+  assertArrayBuffersEquals(expectedBufferValue, panner.fixedBuffer_);
+  var expectedMappingValue = mapping;
+  assertArraysEquals(expectedMappingValue, panner.brailleToText);
+});
+
+TEST_F('CvoxPanStrategyUnitTest', 'WrappedSetContent', function() {
+  var panner = new cvox.PanStrategy();
+  panner.setPanStrategy(true);
+
+  // When first word is bigger than column size. (Don't wrap word)
+  var textContent = "ABCDE"
+  var translatedContent = createArrayBuffer('11234');
+  var mapping = [0,1,2,3,4];
+  panner.setDisplaySize(1, 4);
+  panner.setContent(textContent, translatedContent,
+    mapping, 0);
+  var expectedBufferValue = translatedContent;
+  assertArrayBuffersEquals(expectedBufferValue, panner.wrappedBuffer_);
+  var expectedMappingValue = mapping;
+  assertArraysEquals(expectedMappingValue, panner.brailleToText);
+
+  // When first word is equal to column size.
+  // (We expect space to be removed on next line)
+  textContent = "ABCDE FGHI"
+  translatedContent = createArrayBuffer('11234 6789');
+  var mapping = [0,1,2,3,4,5,6,7,8,9];
+  panner.setDisplaySize(1, 5);
+  panner.setContent(textContent, translatedContent,
+    mapping, 0);
+  expectedBufferValue = createArrayBuffer('112346789');
+  assertArrayBuffersEquals(expectedBufferValue, panner.wrappedBuffer_);
+  expectedMappingValue = [0,1,2,3,4,6,7,8,9];
+  assertArraysEquals(expectedMappingValue, panner.brailleToText);
+
+  // When first word is equal to column size + 1. (Space stays)
+  panner.setDisplaySize(1, 6);
+  expectedBufferValue = createArrayBuffer('11234 6789');
+  assertArrayBuffersEquals(expectedBufferValue, panner.wrappedBuffer_);
+  expectedMappingValue = mapping;
+  assertArraysEquals(expectedMappingValue, panner.brailleToText);
+
+  // When first word is smaller than column size but second word is too big
+  // to fit the same line. (Pad that line, move second word to next line)
+  panner.setDisplaySize(1, 7);
+  expectedBufferValue = createArrayBuffer('11234  6789');
+  assertArrayBuffersEquals(expectedBufferValue, panner.wrappedBuffer_);
+  expectedMappingValue = [0,1,2,3,4,5,5,6,7,8,9];
+  assertArraysEquals(expectedMappingValue, panner.brailleToText);
+
+  // Test all excess spaces are removed.
+  panner.setDisplaySize(1, 6);
+  textContent = "ABCDEF GHI"
+  translatedContent = createArrayBuffer('112345     789');
+  mapping = [0,1,2,3,4,5,6,7,7,7,7,7,8,9,10];
+  panner.setContent(textContent, translatedContent,
+    mapping, 0);
+  expectedBufferValue = createArrayBuffer('112345789');
+  assertArrayBuffersEquals(expectedBufferValue, panner.wrappedBuffer_);
+  expectedMappingValue = [0,1,2,3,4,5,7,8,9];
+  assertArraysEquals(expectedMappingValue, panner.brailleToText);
+});
+
+TEST_F('CvoxPanStrategyUnitTest', 'getCurrentTextViewportContents', function() {
+  var panner = new cvox.PanStrategy();
+  panner.setPanStrategy(true);
+
+  // 30 cells with blank cells at positions 8, 22 and 26.
+  var content = createArrayBuffer('11234567 9112345678911 345 789');
+  var mapping = [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,
+                21,22,23,24,25,26,27,28,29];
+  panner.setContent('11234567 9112345678911 345 789', content, mapping, 0);
+  assertEqualsJSON({firstRow: 0, lastRow: 0}, panner.viewPort);
+  assertFalse(panner.next());
+  assertFalse(panner.previous());
+
+  panner.setDisplaySize(1, 10);
+  assertEqualsJSON({firstRow: 0, lastRow: 0}, panner.viewPort);
+  assertEquals('11234567 ', panner.getCurrentTextViewportContents());
+  panner.next();
+  assertEquals('9112345678', panner.getCurrentTextViewportContents());
+  panner.next();
+  assertEquals('911 345 ', panner.getCurrentTextViewportContents());
+  panner.next();
+  assertEquals('789', panner.getCurrentTextViewportContents());
+});