From fbfb9458d65695f3ccfa33be247b14d8e91f933c Mon Sep 17 00:00:00 2001
From: Tim van der Meij <timvandermeij@gmail.com>
Date: Fri, 20 Jun 2014 21:49:16 +0200
Subject: [PATCH] Implement text normalization for page content and queries

---
 web/pdf_find_controller.js | 27 +++++++++++++++++++++++++--
 1 file changed, 25 insertions(+), 2 deletions(-)

diff --git a/web/pdf_find_controller.js b/web/pdf_find_controller.js
index a4c472bf3..cabf645fe 100644
--- a/web/pdf_find_controller.js
+++ b/web/pdf_find_controller.js
@@ -43,6 +43,19 @@ var PDFFindController = {
   findTimeout: null,
   pdfPageSource: null,
   integratedFind: false,
+  charactersToNormalize: {
+    '\u2018': '\'', // Left single quotation mark
+    '\u2019': '\'', // Right single quotation mark
+    '\u201A': '\'', // Single low-9 quotation mark
+    '\u201B': '\'', // Single high-reversed-9 quotation mark
+    '\u201C': '"', // Left double quotation mark
+    '\u201D': '"', // Right double quotation mark
+    '\u201E': '"', // Double low-9 quotation mark
+    '\u201F': '"', // Double high-reversed-9 quotation mark
+    '\u00BC': '1/4', // Vulgar fraction one quarter
+    '\u00BD': '1/2', // Vulgar fraction one half
+    '\u00BE': '3/4' // Vulgar fraction three quarters
+  },
 
   initialize: function(options) {
     if (typeof PDFFindBar === 'undefined' || PDFFindBar === null) {
@@ -53,6 +66,10 @@ var PDFFindController = {
     this.pdfPageSource = options.pdfPageSource;
     this.integratedFind = options.integratedFind;
 
+    // Compile the regular expression for text normalization once
+    var replace = Object.keys(this.charactersToNormalize).join('');
+    this.normalizationRegex = new RegExp('[' + replace + ']', 'g');
+
     var events = [
       'find',
       'findagain',
@@ -76,9 +93,15 @@ var PDFFindController = {
     this.active = false;
   },
 
+  normalize: function pdfFindControllerNormalize(text) {
+    return text.replace(this.normalizationRegex, function (ch) {
+      return PDFFindController.charactersToNormalize[ch];
+    });
+  },
+
   calcFindMatch: function(pageIndex) {
-    var pageContent = this.pageContents[pageIndex];
-    var query = this.state.query;
+    var pageContent = this.normalize(this.pageContents[pageIndex]);
+    var query = this.normalize(this.state.query);
     var caseSensitive = this.state.caseSensitive;
     var queryLen = query.length;