From 857a5da8f12d1cd360ed12ad311b61e55e7203b8 Mon Sep 17 00:00:00 2001
From: Syed Abdullah <contact@syedabdullah.net>
Date: Thu, 12 Jan 2017 00:04:54 +0800
Subject: [PATCH] Fix inverted calculation of RTL text percentage in bidi.

---
 src/core/bidi.js          |  2 +-
 test/unit/bidi_spec.js    | 50 +++++++++++++++++++++++++++++++++++++++
 test/unit/clitests.json   |  1 +
 test/unit/jasmine-boot.js | 31 ++++++++++++------------
 4 files changed, 68 insertions(+), 16 deletions(-)
 create mode 100644 test/unit/bidi_spec.js

diff --git a/src/core/bidi.js b/src/core/bidi.js
index 49a4f62a6..f446e123a 100644
--- a/src/core/bidi.js
+++ b/src/core/bidi.js
@@ -171,7 +171,7 @@
     }
 
     if (startLevel === -1) {
-      if ((strLength / numBidi) < 0.3) {
+      if ((numBidi / strLength) < 0.3) {
         isLTR = true;
         startLevel = 0;
       } else {
diff --git a/test/unit/bidi_spec.js b/test/unit/bidi_spec.js
new file mode 100644
index 000000000..d2bec0b9d
--- /dev/null
+++ b/test/unit/bidi_spec.js
@@ -0,0 +1,50 @@
+/* Copyright 2017 Mozilla Foundation
+ *
+ * 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.
+ */
+'use strict';
+
+(function (root, factory) {
+  if (typeof define === 'function' && define.amd) {
+    define('pdfjs-test/unit/bidi_spec', ['exports', 'pdfjs/core/bidi'],
+           factory);
+  } else if (typeof exports !== 'undefined') {
+    factory(exports, require('../../src/core/bidi.js'));
+  } else {
+    factory((root.pdfjsTestUnitBidiSpec = {}), root.pdfjsCoreBidi);
+  }
+}(this, function (exports, coreBidi) {
+
+var bidi = coreBidi.bidi;
+
+describe('bidi', function () {
+  it('should mark text as RTL if more than 30% of text is RTL', function() {
+    // 33% of test text are RTL characters
+    var test = '\u0645\u0635\u0631 Egypt';
+    var result = 'Egypt \u0631\u0635\u0645';
+    var bidiText = bidi(test, -1, false);
+
+    expect(bidiText.str).toEqual(result);
+    expect(bidiText.dir).toEqual('rtl');
+  });
+
+  it('should mark text as LTR if less than 30% of text is RTL', function() {
+    var test = 'Egypt is known as \u0645\u0635\u0631 in Arabic.';
+    var result = 'Egypt is known as \u0631\u0635\u0645 in Arabic.';
+    var bidiText = bidi(test, -1, false);
+
+    expect(bidiText.str).toEqual(result);
+    expect(bidiText.dir).toEqual('ltr');
+  });
+});
+}));
diff --git a/test/unit/clitests.json b/test/unit/clitests.json
index e1635a9b4..ee92e899f 100644
--- a/test/unit/clitests.json
+++ b/test/unit/clitests.json
@@ -1,6 +1,7 @@
 {
   "spec_dir": "test/unit",
   "spec_files": [
+    "bidi_spec.js",
     "cff_parser_spec.js",
     "crypto_spec.js",
     "document_spec.js",
diff --git a/test/unit/jasmine-boot.js b/test/unit/jasmine-boot.js
index b010e4f7e..2637ca373 100644
--- a/test/unit/jasmine-boot.js
+++ b/test/unit/jasmine-boot.js
@@ -46,24 +46,25 @@ function initializePDFJS(callback) {
   require.config({paths: {'pdfjs': '../../src', 'pdfjs-web': '../../web',
                  'pdfjs-test': '..'}});
   require(['pdfjs/display/global', 'pdfjs-test/unit/annotation_layer_spec',
-           'pdfjs-test/unit/api_spec', 'pdfjs-test/unit/cff_parser_spec',
-           'pdfjs-test/unit/cmap_spec', 'pdfjs-test/unit/crypto_spec',
-           'pdfjs-test/unit/document_spec', 'pdfjs-test/unit/dom_utils_spec',
-           'pdfjs-test/unit/evaluator_spec', 'pdfjs-test/unit/fonts_spec',
-           'pdfjs-test/unit/function_spec', 'pdfjs-test/unit/metadata_spec',
-           'pdfjs-test/unit/murmurhash3_spec', 'pdfjs-test/unit/network_spec',
-           'pdfjs-test/unit/parser_spec', 'pdfjs-test/unit/primitives_spec',
-           'pdfjs-test/unit/stream_spec', 'pdfjs-test/unit/type1_parser_spec',
+           'pdfjs-test/unit/api_spec', 'pdfjs-test/unit/bidi_spec',
+           'pdfjs-test/unit/cff_parser_spec', 'pdfjs-test/unit/cmap_spec',
+           'pdfjs-test/unit/crypto_spec', 'pdfjs-test/unit/document_spec',
+           'pdfjs-test/unit/dom_utils_spec', 'pdfjs-test/unit/evaluator_spec',
+           'pdfjs-test/unit/fonts_spec', 'pdfjs-test/unit/function_spec',
+           'pdfjs-test/unit/metadata_spec', 'pdfjs-test/unit/murmurhash3_spec',
+           'pdfjs-test/unit/network_spec', 'pdfjs-test/unit/parser_spec',
+           'pdfjs-test/unit/primitives_spec', 'pdfjs-test/unit/stream_spec',
+           'pdfjs-test/unit/type1_parser_spec',
            'pdfjs-test/unit/ui_utils_spec', 'pdfjs-test/unit/unicode_spec',
            'pdfjs-test/unit/util_spec'],
     function (displayGlobal, testUnitAnnotationLayerSpec, testUnitApiSpec,
-              testUnitCFFParserSpec, testUnitCMapSpec, testUnitCryptoSpec,
-              testUnitDocumentSpec, testUnitDOMUtilsSpec, testUnitEvaluatorSpec,
-              testUnitFontsSpec, testUnitFunctionSpec, testUnitMetadataSpec,
-              testUnitMurmurHash3Spec, testUnitNetworkSpec, testUnitParserSpec,
-              testUnitPrimitivesSpec, testUnitStreamSpec,
-              testUnitType1ParserSpec, testUnitUiUtilsSpec, testUnitUnicodeSpec,
-              testUnitUtilSpec) {
+              testUnitBidiSpec, testUnitCFFParserSpec, testUnitCMapSpec,
+              testUnitCryptoSpec, testUnitDocumentSpec, testUnitDOMUtilsSpec,
+              testUnitEvaluatorSpec, testUnitFontsSpec, testUnitFunctionSpec,
+              testUnitMetadataSpec, testUnitMurmurHash3Spec,
+              testUnitNetworkSpec, testUnitParserSpec, testUnitPrimitivesSpec,
+              testUnitStreamSpec, testUnitType1ParserSpec, testUnitUiUtilsSpec,
+              testUnitUnicodeSpec, testUnitUtilSpec) {
 
       // Configure the worker.
       displayGlobal.PDFJS.workerSrc = '../../src/worker_loader.js';