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// Copyright 2016 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.
cr.define('extensions', function() {
'use strict';
/**
* @param {number} totalCount
* @param {number} oppositeCount
* @return {number}
*/
function visibleLineCount(totalCount, oppositeCount) {
// We limit the number of lines shown for DOM performance.
const MAX_VISIBLE_LINES = 1000;
const max =
Math.max(MAX_VISIBLE_LINES / 2, MAX_VISIBLE_LINES - oppositeCount);
return Math.min(max, totalCount);
}
const CodeSection = Polymer({
is: 'extensions-code-section',
behaviors: [I18nBehavior],
properties: {
/**
* The code this object is displaying.
* @type {?chrome.developerPrivate.RequestFileSourceResponse}
*/
code: {
type: Object,
value: null,
},
isActive: Boolean,
/** @private Highlighted code. */
highlighted_: String,
/** @private Code before the highlighted section. */
before_: String,
/** @private Code after the highlighted section. */
after_: String,
/** @private */
showNoCode_: {
type: Boolean,
computed: 'computeShowNoCode_(isActive, highlighted_)',
},
/** @private Description for the highlighted section. */
highlightDescription_: String,
/** @private */
lineNumbers_: String,
/** @private */
truncatedBefore_: Number,
/** @private */
truncatedAfter_: Number,
/**
* The string to display if no |code| is set (e.g. because we couldn't
* load the relevant source file).
* @type {string}
*/
couldNotDisplayCode: String,
},
observers: [
'onCodeChanged_(code.*)',
],
/**
* @private
*/
onCodeChanged_: function() {
if (!this.code ||
(!this.code.beforeHighlight && !this.code.highlight &&
!this.code.afterHighlight)) {
this.highlighted_ = '';
this.highlightDescription_ = '';
this.before_ = '';
this.after_ = '';
this.lineNumbers_ = '';
return;
}
const before = this.code.beforeHighlight;
const highlight = this.code.highlight;
const after = this.code.afterHighlight;
const linesBefore = before ? before.split('\n') : [];
const linesAfter = after ? after.split('\n') : [];
const visibleLineCountBefore =
visibleLineCount(linesBefore.length, linesAfter.length);
const visibleLineCountAfter =
visibleLineCount(linesAfter.length, linesBefore.length);
const visibleBefore =
linesBefore.slice(linesBefore.length - visibleLineCountBefore)
.join('\n');
let visibleAfter = linesAfter.slice(0, visibleLineCountAfter).join('\n');
// If the last character is a \n, force it to be rendered.
if (visibleAfter.charAt(visibleAfter.length - 1) == '\n') {
visibleAfter += ' ';
}
this.highlighted_ = highlight;
this.highlightDescription_ = this.getAccessibilityHighlightDescription_(
linesBefore.length, highlight.split('\n').length);
this.before_ = visibleBefore;
this.after_ = visibleAfter;
this.truncatedBefore_ = linesBefore.length - visibleLineCountBefore;
this.truncatedAfter_ = linesAfter.length - visibleLineCountAfter;
const visibleCode = visibleBefore + highlight + visibleAfter;
this.setLineNumbers_(
this.truncatedBefore_ + 1,
this.truncatedBefore_ + visibleCode.split('\n').length);
this.scrollToHighlight_(visibleLineCountBefore);
},
/**
* @param {number} lineCount
* @param {string} stringSingular
* @param {string} stringPluralTemplate
* @return {string}
* @private
*/
getLinesNotShownLabel_(lineCount, stringSingular, stringPluralTemplate) {
return lineCount == 1 ?
stringSingular :
loadTimeData.substituteString(stringPluralTemplate, lineCount);
},
/**
* @param {number} start
* @param {number} end
* @private
*/
setLineNumbers_: function(start, end) {
let lineNumbers = '';
for (let i = start; i <= end; ++i) {
lineNumbers += i + '\n';
}
this.lineNumbers_ = lineNumbers;
},
/**
* @param {number} linesBeforeHighlight
* @private
*/
scrollToHighlight_: function(linesBeforeHighlight) {
const CSS_LINE_HEIGHT = 20;
// Count how many pixels is above the highlighted code.
const highlightTop = linesBeforeHighlight * CSS_LINE_HEIGHT;
// Find the position to show the highlight roughly in the middle.
const targetTop = highlightTop - this.clientHeight * 0.5;
this.$['scroll-container'].scrollTo({top: targetTop});
},
/**
* @param {number} lineStart
* @param {number} numLines
* @return {string}
* @private
*/
getAccessibilityHighlightDescription_: function(lineStart, numLines) {
if (numLines > 1) {
return this.i18n(
'accessibilityErrorMultiLine', lineStart.toString(),
(lineStart + numLines - 1).toString());
} else {
return this.i18n('accessibilityErrorLine', lineStart.toString());
}
},
/**
* @private
* @return {boolean}
*/
computeShowNoCode_: function() {
return this.isActive && !this.highlighted_;
},
});
return {CodeSection: CodeSection};
});
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