chrome/browser/resources/about_sys/about_sys.js

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 // Contents of lines that act as delimiters for multi-line values.
   6 var DELIM_START = '---------- START ----------';
   7 var DELIM_END = '---------- END ----------';
   8
   9 // Limit file size to 10 MiB to prevent hanging on accidental upload.
  10 var MAX_FILE_SIZE = 10485760;
  11
  12 function getValueDivForButton(button) {
  13   return $(button.id.substr(0, button.id.length - 4));
  14 }
  15
  16 function getButtonForValueDiv(valueDiv) {
  17   return $(valueDiv.id + '-btn');
  18 }
  19
  20 function handleDragOver(e) {
  21   e.dataTransfer.dropEffect = 'copy';
  22   e.preventDefault();
  23 }
  24
  25 function handleDrop(e) {
  26   var file = e.dataTransfer.files[0];
  27   if (file) {
  28     e.preventDefault();
  29     importLog(file);
  30   }
  31 }
  32
  33 function showError(fileName) {
  34   $('status').textContent = loadTimeData.getStringF('parseError', fileName);
  35 }
  36
  37 /**
  38  * Toggles whether an item is collapsed or expanded.
  39  */
  40 function changeCollapsedStatus() {
  41   var valueDiv = getValueDivForButton(this);
  42   if (valueDiv.parentNode.className == 'number-collapsed') {
  43     valueDiv.parentNode.className = 'number-expanded';
  44     this.textContent = loadTimeData.getString('collapseBtn');
  45   } else {
  46     valueDiv.parentNode.className = 'number-collapsed';
  47     this.textContent = loadTimeData.getString('expandBtn');
  48   }
  49 }
  50
  51 /**
  52  * Collapses all log items.
  53  */
  54 function collapseAll() {
  55   var valueDivs = document.getElementsByClassName('stat-value');
  56   for (var i = 0; i < valueDivs.length; i++) {
  57     var button = getButtonForValueDiv(valueDivs[i]);
  58     if (button && button.className != 'button-hidden') {
  59       button.textContent = loadTimeData.getString('expandBtn');
  60       valueDivs[i].parentNode.className = 'number-collapsed';
  61     }
  62   }
  63 }
  64
  65 /**
  66  * Expands all log items.
  67  */
  68 function expandAll() {
  69   var valueDivs = document.getElementsByClassName('stat-value');
  70   for (var i = 0; i < valueDivs.length; i++) {
  71     var button = getButtonForValueDiv(valueDivs[i]);
  72     if (button && button.className != 'button-hidden') {
  73       button.textContent = loadTimeData.getString('collapseBtn');
  74       valueDivs[i].parentNode.className = 'number-expanded';
  75     }
  76   }
  77 }
  78
  79 /**
  80  * Collapse only those log items with multi-line values.
  81  */
  82 function collapseMultiLineStrings() {
  83   var valueDivs = document.getElementsByClassName('stat-value');
  84   var nameDivs = document.getElementsByClassName('stat-name');
  85   for (var i = 0; i < valueDivs.length; i++) {
  86     var button = getButtonForValueDiv(valueDivs[i]);
  87     button.onclick = changeCollapsedStatus;
  88     if (valueDivs[i].scrollHeight > (nameDivs[i].scrollHeight * 2)) {
  89       button.className = '';
  90       button.textContent = loadTimeData.getString('expandBtn');
  91       valueDivs[i].parentNode.className = 'number-collapsed';
  92     } else {
  93       button.className = 'button-hidden';
  94       valueDivs[i].parentNode.className = 'number';
  95     }
  96   }
  97 }
  98
  99 /**
 100  * Read in a log asynchronously, calling parseSystemLog if successful.
 101  * @param {File} file The file to read.
 102  */
 103 function importLog(file) {
 104   if (file && file.size <= MAX_FILE_SIZE) {
 105     var reader = new FileReader();
 106     reader.onload = function() {
 107       if (parseSystemLog(this.result)) {
 108         // Reset table title and status
 109         $('tableTitle').textContent =
 110               loadTimeData.getStringF('logFileTableTitle', file.name);
 111         $('status').textContent = '';
 112       } else {
 113         showError(file.name);
 114       }
 115     };
 116     reader.readAsText(file);
 117   } else if (file) {
 118     showError(file.name);
 119   }
 120 }
 121
 122 /**
 123  * Convert text-based log into list of name-value pairs.
 124  * @param {string} text The raw text of a log.
 125  * @return {boolean} True if the log was parsed successfully.
 126  */
 127 function parseSystemLog(text) {
 128   var details = [];
 129   var lines = text.split('\n');
 130   for (var i = 0, len = lines.length; i < len; i++) {
 131     // Skip empty lines.
 132     if (!lines[i])
 133       continue;
 134
 135     var delimiter = lines[i].indexOf('=');
 136     if (delimiter <= 0) {
 137       if (i == lines.length - 1)
 138          break;
 139       // If '=' is missing here, format is wrong.
 140       return false;
 141     }
 142
 143     var name = lines[i].substring(0, delimiter);
 144     var value = '';
 145     // Set value if non-empty
 146     if (lines[i].length > delimiter + 1)
 147       value = lines[i].substring(delimiter + 1);
 148
 149     // Delimiters are based on kMultilineIndicatorString, kMultilineStartString,
 150     // and kMultilineEndString in components/feedback/feedback_data.cc.
 151     // If these change, we should check for both the old and new versions.
 152     if (value == '<multiline>') {
 153       // Skip start delimiter.
 154       if (i == len - 1 ||
 155           lines[++i].indexOf(DELIM_START) == -1)
 156         return false;
 157
 158       ++i;
 159       value = '';
 160       // Append lines between start and end delimiters.
 161       while (i < len && lines[i] != DELIM_END)
 162         value += lines[i++] + '\n';
 163
 164       // Remove trailing newline.
 165       if (value)
 166         value = value.substr(0, value.length - 1);
 167     }
 168     details.push({'statName': name, 'statValue': value});
 169   }
 170
 171   var templateData = {'details': details};
 172   jstProcess(new JsEvalContext(templateData), $('t'));
 173
 174   collapseMultiLineStrings();
 175   return true;
 176 }
 177
 178 document.addEventListener('DOMContentLoaded', function() {
 179   jstProcess(loadTimeData.createJsEvalContext(), $('t'));
 180
 181   $('collapseAll').onclick = collapseAll;
 182   $('expandAll').onclick = expandAll;
 183
 184   var tp = $('t');
 185   tp.addEventListener('dragover', handleDragOver, false);
 186   tp.addEventListener('drop', handleDrop, false);
 187
 188   collapseMultiLineStrings();
 189 });