| /** |
| * @license |
| * Copyright (C) 2016 The Android Open Source Project |
| * |
| * 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. |
| */ |
| (function() { |
| 'use strict'; |
| |
| const ERR_COMMENT_ON_EDIT = 'You cannot comment on an edit.'; |
| const ERR_COMMENT_ON_EDIT_BASE = 'You cannot comment on the base patch set ' + |
| 'of an edit.'; |
| const ERR_INVALID_LINE = 'Invalid line number: '; |
| |
| const NO_NEWLINE_BASE = 'No newline at end of base file.'; |
| const NO_NEWLINE_REVISION = 'No newline at end of revision file.'; |
| |
| const DiffViewMode = { |
| SIDE_BY_SIDE: 'SIDE_BY_SIDE', |
| UNIFIED: 'UNIFIED_DIFF', |
| }; |
| |
| const DiffSide = { |
| LEFT: 'left', |
| RIGHT: 'right', |
| }; |
| |
| const Defs = {}; |
| |
| /** |
| * Special line number which should not be collapsed into a shared region. |
| * |
| * @typedef {{ |
| * number: number, |
| * leftSide: boolean |
| * }} |
| */ |
| Defs.LineOfInterest; |
| |
| const LARGE_DIFF_THRESHOLD_LINES = 10000; |
| const FULL_CONTEXT = -1; |
| const LIMITED_CONTEXT = 10; |
| |
| /** @typedef {{start_line: number, start_character: number, |
| * end_line: number, end_character: number}} */ |
| Gerrit.Range; |
| |
| /** |
| * Compare two ranges. Either argument may be falsy, but will only return |
| * true if both are falsy or if neither are falsy and have the same position |
| * values. |
| * |
| * @param {Gerrit.Range=} a range 1 |
| * @param {Gerrit.Range=} b range 2 |
| * @return {boolean} |
| */ |
| Gerrit.rangesEqual = function(a, b) { |
| if (!a && !b) { return true; } |
| if (!a || !b) { return false; } |
| return a.start_line === b.start_line && |
| a.start_character === b.start_character && |
| a.end_line === b.end_line && |
| a.end_character === b.end_character; |
| }; |
| |
| function isThreadEl(node) { |
| return node.nodeType === Node.ELEMENT_NODE && |
| node.classList.contains('comment-thread'); |
| } |
| |
| /** |
| * Turn a slot element into the corresponding content element. |
| * Slots are only fully supported in Polymer 2 - in Polymer 1, they are |
| * replaced with content elements during template parsing. This conversion is |
| * not applied for imperatively created slot elements, so this method |
| * implements the same behavior as the template parsing for imperative slots. |
| */ |
| Gerrit.slotToContent = function(slot) { |
| const content = document.createElement('content'); |
| content.name = slot.name; |
| content.setAttribute('select', `[slot='${slot.name}']`); |
| return content; |
| }; |
| |
| Polymer({ |
| is: 'gr-diff', |
| |
| /** |
| * Fired when the user selects a line. |
| * @event line-selected |
| */ |
| |
| /** |
| * Fired if being logged in is required. |
| * |
| * @event show-auth-required |
| */ |
| |
| /** |
| * Fired when a comment is created |
| * |
| * @event create-comment |
| */ |
| |
| properties: { |
| changeNum: String, |
| noAutoRender: { |
| type: Boolean, |
| value: false, |
| }, |
| /** @type {?} */ |
| patchRange: Object, |
| path: String, |
| prefs: { |
| type: Object, |
| observer: '_prefsObserver', |
| }, |
| projectName: String, |
| displayLine: { |
| type: Boolean, |
| value: false, |
| }, |
| isImageDiff: { |
| type: Boolean, |
| }, |
| commitRange: Object, |
| hidden: { |
| type: Boolean, |
| reflectToAttribute: true, |
| }, |
| noRenderOnPrefsChange: Boolean, |
| /** @type {!Array<!Gerrit.HoveredRange>} */ |
| _commentRanges: { |
| type: Array, |
| value: () => [], |
| }, |
| lineWrapping: { |
| type: Boolean, |
| value: false, |
| observer: '_lineWrappingObserver', |
| }, |
| viewMode: { |
| type: String, |
| value: DiffViewMode.SIDE_BY_SIDE, |
| observer: '_viewModeObserver', |
| }, |
| |
| /** @type ?Defs.LineOfInterest */ |
| lineOfInterest: Object, |
| |
| /** |
| * The key locations based on the comments and line of interests, |
| * where lines should not be collapsed. |
| * |
| * @type {{left: Object<(string|number), number>, |
| * right: Object<(string|number), number>}} |
| */ |
| _keyLocations: { |
| type: Object, |
| value: () => ({ |
| left: {}, |
| right: {}, |
| }), |
| }, |
| |
| loading: { |
| type: Boolean, |
| value: false, |
| observer: '_loadingChanged', |
| }, |
| |
| loggedIn: { |
| type: Boolean, |
| value: false, |
| }, |
| diff: { |
| type: Object, |
| observer: '_diffChanged', |
| }, |
| _diffHeaderItems: { |
| type: Array, |
| value: [], |
| computed: '_computeDiffHeaderItems(diff.*)', |
| }, |
| _diffTableClass: { |
| type: String, |
| value: '', |
| }, |
| /** @type {?Object} */ |
| baseImage: Object, |
| /** @type {?Object} */ |
| revisionImage: Object, |
| |
| /** |
| * Whether the safety check for large diffs when whole-file is set has |
| * been bypassed. If the value is null, then the safety has not been |
| * bypassed. If the value is a number, then that number represents the |
| * context preference to use when rendering the bypassed diff. |
| * |
| * @type (number|null) |
| */ |
| _safetyBypass: { |
| type: Number, |
| value: null, |
| }, |
| |
| _showWarning: Boolean, |
| |
| /** @type {?string} */ |
| errorMessage: { |
| type: String, |
| value: null, |
| }, |
| |
| /** @type {?Object} */ |
| blame: { |
| type: Object, |
| value: null, |
| observer: '_blameChanged', |
| }, |
| |
| parentIndex: Number, |
| |
| _newlineWarning: { |
| type: String, |
| computed: '_computeNewlineWarning(diff)', |
| }, |
| |
| _diffLength: Number, |
| |
| /** |
| * Observes comment nodes added or removed after the initial render. |
| * Can be used to unregister when the entire diff is (re-)rendered or upon |
| * detachment. |
| * @type {?PolymerDomApi.ObserveHandle} |
| */ |
| _incrementalNodeObserver: Object, |
| |
| /** |
| * Observes comment nodes added or removed at any point. |
| * Can be used to unregister upon detachment. |
| * @type {?PolymerDomApi.ObserveHandle} |
| */ |
| _nodeObserver: Object, |
| }, |
| |
| behaviors: [ |
| Gerrit.PatchSetBehavior, |
| ], |
| |
| listeners: { |
| 'create-range-comment': '_handleCreateRangeComment', |
| 'render-content': '_handleRenderContent', |
| }, |
| |
| attached() { |
| this._observeNodes(); |
| }, |
| |
| detached() { |
| this._unobserveIncrementalNodes(); |
| this._unobserveNodes(); |
| }, |
| |
| _observeNodes() { |
| this._nodeObserver = Polymer.dom(this).observeNodes(info => { |
| const addedThreadEls = info.addedNodes.filter(isThreadEl); |
| const removedThreadEls = info.removedNodes.filter(isThreadEl); |
| this._updateRanges(addedThreadEls, removedThreadEls); |
| this._updateKeyLocations(addedThreadEls, removedThreadEls); |
| this._redispatchHoverEvents(addedThreadEls); |
| }); |
| }, |
| |
| _updateRanges(addedThreadEls, removedThreadEls) { |
| function commentRangeFromThreadEl(threadEl) { |
| const side = threadEl.getAttribute('comment-side'); |
| const range = JSON.parse(threadEl.getAttribute('range')); |
| return {side, range, hovering: false}; |
| } |
| |
| const addedCommentRanges = addedThreadEls |
| .map(commentRangeFromThreadEl) |
| .filter(({range}) => range); |
| const removedCommentRanges = removedThreadEls |
| .map(commentRangeFromThreadEl) |
| .filter(({range}) => range); |
| for (const removedCommentRange of removedCommentRanges) { |
| const i = this._commentRanges.findIndex(commentRange => { |
| return commentRange.side === removedCommentRange.side && |
| Gerrit.rangesEqual(commentRange.range, removedCommentRange.range); |
| }); |
| this.splice('_commentRanges', i, 1); |
| } |
| this.push('_commentRanges', ...addedCommentRanges); |
| }, |
| |
| _updateKeyLocations(addedThreadEls, removedThreadEls) { |
| for (const threadEl of addedThreadEls) { |
| const commentSide = threadEl.getAttribute('comment-side'); |
| const lineNum = threadEl.getAttribute('line-num') || GrDiffLine.FILE; |
| this._keyLocations[commentSide][lineNum] = true; |
| } |
| for (const threadEl of removedThreadEls) { |
| const commentSide = threadEl.getAttribute('comment-side'); |
| const lineNum = threadEl.getAttribute('line-num') || GrDiffLine.FILE; |
| this._keyLocations[commentSide][lineNum] = false; |
| } |
| }, |
| |
| // Dispatch events that are handled by the gr-diff-highlight. |
| _redispatchHoverEvents(addedThreadEls) { |
| for (const threadEl of addedThreadEls) { |
| threadEl.addEventListener('mouseenter', () => { |
| threadEl.dispatchEvent( |
| new CustomEvent('comment-thread-mouseenter', {bubbles: true})); |
| }); |
| threadEl.addEventListener('mouseleave', () => { |
| threadEl.dispatchEvent( |
| new CustomEvent('comment-thread-mouseleave', {bubbles: true})); |
| }); |
| } |
| }, |
| |
| /** Cancel any remaining diff builder rendering work. */ |
| cancel() { |
| this.$.diffBuilder.cancel(); |
| }, |
| |
| /** @return {!Array<!HTMLElement>} */ |
| getCursorStops() { |
| if (this.hidden && this.noAutoRender) { |
| return []; |
| } |
| |
| return Polymer.dom(this.root).querySelectorAll('.diff-row'); |
| }, |
| |
| /** @return {boolean} */ |
| isRangeSelected() { |
| return this.$.highlights.isRangeSelected(); |
| }, |
| |
| toggleLeftDiff() { |
| this.toggleClass('no-left'); |
| }, |
| |
| _blameChanged(newValue) { |
| this.$.diffBuilder.setBlame(newValue); |
| if (newValue) { |
| this.classList.add('showBlame'); |
| } else { |
| this.classList.remove('showBlame'); |
| } |
| }, |
| |
| /** @return {string} */ |
| _computeContainerClass(loggedIn, viewMode, displayLine) { |
| const classes = ['diffContainer']; |
| switch (viewMode) { |
| case DiffViewMode.UNIFIED: |
| classes.push('unified'); |
| break; |
| case DiffViewMode.SIDE_BY_SIDE: |
| classes.push('sideBySide'); |
| break; |
| default: |
| throw Error('Invalid view mode: ', viewMode); |
| } |
| if (Gerrit.hiddenscroll) { |
| classes.push('hiddenscroll'); |
| } |
| if (loggedIn) { |
| classes.push('canComment'); |
| } |
| if (displayLine) { |
| classes.push('displayLine'); |
| } |
| return classes.join(' '); |
| }, |
| |
| _handleTap(e) { |
| const el = Polymer.dom(e).localTarget; |
| |
| if (el.classList.contains('showContext')) { |
| this.$.diffBuilder.showContext(e.detail.groups, e.detail.section); |
| } else if (el.classList.contains('lineNum')) { |
| this.addDraftAtLine(el); |
| } else if (el.tagName === 'HL' || |
| el.classList.contains('content') || |
| el.classList.contains('contentText')) { |
| const target = this.$.diffBuilder.getLineElByChild(el); |
| if (target) { this._selectLine(target); } |
| } |
| }, |
| |
| _selectLine(el) { |
| this.fire('line-selected', { |
| side: el.classList.contains('left') ? DiffSide.LEFT : DiffSide.RIGHT, |
| number: el.getAttribute('data-value'), |
| path: this.path, |
| }); |
| }, |
| |
| addDraftAtLine(el) { |
| this._selectLine(el); |
| if (!this._isValidElForComment(el)) { return; } |
| |
| const value = el.getAttribute('data-value'); |
| let lineNum; |
| if (value !== GrDiffLine.FILE) { |
| lineNum = parseInt(value, 10); |
| if (isNaN(lineNum)) { |
| this.fire('show-alert', {message: ERR_INVALID_LINE + value}); |
| return; |
| } |
| } |
| this._createComment(el, lineNum); |
| }, |
| |
| _handleCreateRangeComment(e) { |
| const range = e.detail.range; |
| const side = e.detail.side; |
| const lineNum = range.end_line; |
| const lineEl = this.$.diffBuilder.getLineElByNumber(lineNum, side); |
| |
| if (this._isValidElForComment(lineEl)) { |
| this._createComment(lineEl, lineNum, side, range); |
| } |
| }, |
| |
| /** @return {boolean} */ |
| _isValidElForComment(el) { |
| if (!this.loggedIn) { |
| this.fire('show-auth-required'); |
| return false; |
| } |
| const patchNum = el.classList.contains(DiffSide.LEFT) ? |
| this.patchRange.basePatchNum : |
| this.patchRange.patchNum; |
| |
| const isEdit = this.patchNumEquals(patchNum, this.EDIT_NAME); |
| const isEditBase = this.patchNumEquals(patchNum, this.PARENT_NAME) && |
| this.patchNumEquals(this.patchRange.patchNum, this.EDIT_NAME); |
| |
| if (isEdit) { |
| this.fire('show-alert', {message: ERR_COMMENT_ON_EDIT}); |
| return false; |
| } else if (isEditBase) { |
| this.fire('show-alert', {message: ERR_COMMENT_ON_EDIT_BASE}); |
| return false; |
| } |
| return true; |
| }, |
| |
| /** |
| * @param {!Object} lineEl |
| * @param {number=} lineNum |
| * @param {string=} side |
| * @param {!Object=} range |
| */ |
| _createComment(lineEl, lineNum=undefined, side=undefined, range=undefined) { |
| const contentText = this.$.diffBuilder.getContentByLineEl(lineEl); |
| const contentEl = contentText.parentElement; |
| side = side || |
| this._getCommentSideByLineAndContent(lineEl, contentEl); |
| const patchForNewThreads = this._getPatchNumByLineAndContent( |
| lineEl, contentEl); |
| const isOnParent = |
| this._getIsParentCommentByLineAndContent(lineEl, contentEl); |
| this.dispatchEvent(new CustomEvent('create-comment', { |
| bubbles: true, |
| detail: { |
| lineNum, |
| side, |
| patchNum: patchForNewThreads, |
| isOnParent, |
| range, |
| }, |
| })); |
| }, |
| |
| _getThreadGroupForLine(contentEl) { |
| return contentEl.querySelector('.thread-group'); |
| }, |
| |
| /** |
| * Gets or creates a comment thread group for a specific line and side on a |
| * diff. |
| * @param {!Object} contentEl |
| * @param {!Gerrit.DiffSide} commentSide |
| * @return {!Node} |
| */ |
| _getOrCreateThreadGroup(contentEl, commentSide) { |
| // Check if thread group exists. |
| let threadGroupEl = this._getThreadGroupForLine(contentEl); |
| if (!threadGroupEl) { |
| threadGroupEl = document.createElement('div'); |
| threadGroupEl.className = 'thread-group'; |
| threadGroupEl.setAttribute('data-side', commentSide); |
| contentEl.appendChild(threadGroupEl); |
| } |
| return threadGroupEl; |
| }, |
| |
| /** |
| * The value to be used for the patch number of new comments created at the |
| * given line and content elements. |
| * |
| * In two cases of creating a comment on the left side, the patch number to |
| * be used should actually be right side of the patch range: |
| * - When the patch range is against the parent comment of a normal change. |
| * Such comments declare themmselves to be on the left using side=PARENT. |
| * - If the patch range is against the indexed parent of a merge change. |
| * Such comments declare themselves to be on the given parent by |
| * specifying the parent index via parent=i. |
| * |
| * @return {number} |
| */ |
| _getPatchNumByLineAndContent(lineEl, contentEl) { |
| let patchNum = this.patchRange.patchNum; |
| |
| if ((lineEl.classList.contains(DiffSide.LEFT) || |
| contentEl.classList.contains('remove')) && |
| this.patchRange.basePatchNum !== 'PARENT' && |
| !this.isMergeParent(this.patchRange.basePatchNum)) { |
| patchNum = this.patchRange.basePatchNum; |
| } |
| return patchNum; |
| }, |
| |
| /** @return {boolean} */ |
| _getIsParentCommentByLineAndContent(lineEl, contentEl) { |
| if ((lineEl.classList.contains(DiffSide.LEFT) || |
| contentEl.classList.contains('remove')) && |
| (this.patchRange.basePatchNum === 'PARENT' || |
| this.isMergeParent(this.patchRange.basePatchNum))) { |
| return true; |
| } |
| return false; |
| }, |
| |
| /** @return {string} */ |
| _getCommentSideByLineAndContent(lineEl, contentEl) { |
| let side = 'right'; |
| if (lineEl.classList.contains(DiffSide.LEFT) || |
| contentEl.classList.contains('remove')) { |
| side = 'left'; |
| } |
| return side; |
| }, |
| |
| _prefsObserver(newPrefs, oldPrefs) { |
| // Scan the preference objects one level deep to see if they differ. |
| let differ = !oldPrefs; |
| if (newPrefs && oldPrefs) { |
| for (const key in newPrefs) { |
| if (newPrefs[key] !== oldPrefs[key]) { |
| differ = true; |
| } |
| } |
| } |
| |
| if (differ) { |
| this._prefsChanged(newPrefs); |
| } |
| }, |
| |
| _viewModeObserver() { |
| this._prefsChanged(this.prefs); |
| }, |
| |
| /** @param {boolean} newValue */ |
| _loadingChanged(newValue) { |
| if (newValue) { |
| this.cancel(); |
| this._blame = null; |
| this._safetyBypass = null; |
| this._showWarning = false; |
| this.clearDiffContent(); |
| } |
| }, |
| |
| _lineWrappingObserver() { |
| this._prefsChanged(this.prefs); |
| }, |
| |
| _prefsChanged(prefs) { |
| if (!prefs) { return; } |
| |
| this._blame = null; |
| |
| const stylesToUpdate = {}; |
| |
| if (prefs.line_wrapping) { |
| this._diffTableClass = 'full-width'; |
| if (this.viewMode === 'SIDE_BY_SIDE') { |
| stylesToUpdate['--content-width'] = 'none'; |
| stylesToUpdate['--line-limit'] = prefs.line_length + 'ch'; |
| } |
| } else { |
| this._diffTableClass = ''; |
| stylesToUpdate['--content-width'] = prefs.line_length + 'ch'; |
| } |
| |
| if (prefs.font_size) { |
| stylesToUpdate['--font-size'] = prefs.font_size + 'px'; |
| } |
| |
| this.updateStyles(stylesToUpdate); |
| |
| if (this.diff && !this.noRenderOnPrefsChange) { |
| this._renderDiffTable(); |
| } |
| }, |
| |
| _diffChanged(newValue) { |
| if (newValue) { |
| this._diffLength = this.$.diffBuilder.getDiffLength(); |
| this._renderDiffTable(); |
| } |
| }, |
| |
| _renderDiffTable() { |
| this._unobserveIncrementalNodes(); |
| if (!this.prefs) { |
| this.dispatchEvent(new CustomEvent('render', {bubbles: true})); |
| return; |
| } |
| if (this.prefs.context === -1 && |
| this._diffLength >= LARGE_DIFF_THRESHOLD_LINES && |
| this._safetyBypass === null) { |
| this._showWarning = true; |
| this.dispatchEvent(new CustomEvent('render', {bubbles: true})); |
| return; |
| } |
| |
| this._showWarning = false; |
| |
| if (this.lineOfInterest) { |
| const side = this.lineOfInterest.leftSide ? 'left' : 'right'; |
| this._keyLocations[side][this.lineOfInterest.number] = true; |
| } |
| this.$.diffBuilder.render(this._keyLocations, this._getBypassPrefs()); |
| }, |
| |
| _handleRenderContent() { |
| this._incrementalNodeObserver = Polymer.dom(this).observeNodes(info => { |
| const addedThreadEls = info.addedNodes.filter(isThreadEl); |
| // Removed nodes do not need to be handled because all this code does is |
| // adding a slot for the added thread elements, and the extra slots do |
| // not hurt. It's probably a bigger performance cost to remove them than |
| // to keep them around. Medium term we can even consider to add one slot |
| // for each line from the start. |
| for (const threadEl of addedThreadEls) { |
| const lineNumString = threadEl.getAttribute('line-num') || 'FILE'; |
| const commentSide = threadEl.getAttribute('comment-side'); |
| const lineEl = this.$.diffBuilder.getLineElByNumber( |
| lineNumString, commentSide); |
| const contentText = this.$.diffBuilder.getContentByLineEl(lineEl); |
| const contentEl = contentText.parentElement; |
| const threadGroupEl = this._getOrCreateThreadGroup( |
| contentEl, commentSide); |
| // Create a slot for the thread and attach it to the thread group. |
| // The Polyfill has some bugs and this only works if the slot is |
| // attached to the group after the group is attached to the DOM. |
| // The thread group may already have a slot with the right name, but |
| // that is okay because the first matching slot is used and the rest |
| // are ignored. |
| const slot = document.createElement('slot'); |
| slot.name = threadEl.slot; |
| Polymer.dom(threadGroupEl).appendChild(Gerrit.slotToContent(slot)); |
| } |
| }); |
| }, |
| |
| _unobserveIncrementalNodes() { |
| if (this._incrementalNodeObserver) { |
| Polymer.dom(this).unobserveNodes(this._incrementalNodeObserver); |
| } |
| }, |
| |
| _unobserveNodes() { |
| if (this._nodeObserver) { |
| Polymer.dom(this).unobserveNodes(this._nodeObserver); |
| } |
| }, |
| |
| /** |
| * Get the preferences object including the safety bypass context (if any). |
| */ |
| _getBypassPrefs() { |
| if (this._safetyBypass !== null) { |
| return Object.assign({}, this.prefs, {context: this._safetyBypass}); |
| } |
| return this.prefs; |
| }, |
| |
| clearDiffContent() { |
| this._unobserveIncrementalNodes(); |
| this.$.diffTable.innerHTML = null; |
| }, |
| |
| /** @return {!Array} */ |
| _computeDiffHeaderItems(diffInfoRecord) { |
| const diffInfo = diffInfoRecord.base; |
| if (!diffInfo || !diffInfo.diff_header) { return []; } |
| return diffInfo.diff_header.filter(item => { |
| return !(item.startsWith('diff --git ') || |
| item.startsWith('index ') || |
| item.startsWith('+++ ') || |
| item.startsWith('--- ') || |
| item === 'Binary files differ'); |
| }); |
| }, |
| |
| /** @return {boolean} */ |
| _computeDiffHeaderHidden(items) { |
| return items.length === 0; |
| }, |
| |
| _handleFullBypass() { |
| this._safetyBypass = FULL_CONTEXT; |
| this._renderDiffTable(); |
| }, |
| |
| _handleLimitedBypass() { |
| this._safetyBypass = LIMITED_CONTEXT; |
| this._renderDiffTable(); |
| }, |
| |
| /** @return {string} */ |
| _computeWarningClass(showWarning) { |
| return showWarning ? 'warn' : ''; |
| }, |
| |
| /** |
| * @param {string} errorMessage |
| * @return {string} |
| */ |
| _computeErrorClass(errorMessage) { |
| return errorMessage ? 'showError' : ''; |
| }, |
| |
| expandAllContext() { |
| this._handleFullBypass(); |
| }, |
| |
| /** |
| * Find the last chunk for the given side. |
| * @param {!Object} diff |
| * @param {boolean} leftSide true if checking the base of the diff, |
| * false if testing the revision. |
| * @return {Object|null} returns the chunk object or null if there was |
| * no chunk for that side. |
| */ |
| _lastChunkForSide(diff, leftSide) { |
| if (!diff.content.length) { return null; } |
| |
| let chunkIndex = diff.content.length; |
| let chunk; |
| |
| // Walk backwards until we find a chunk for the given side. |
| do { |
| chunkIndex--; |
| chunk = diff.content[chunkIndex]; |
| } while ( |
| // We haven't reached the beginning. |
| chunkIndex >= 0 && |
| |
| // The chunk doesn't have both sides. |
| !chunk.ab && |
| |
| // The chunk doesn't have the given side. |
| ((leftSide && !chunk.a) || (!leftSide && !chunk.b))); |
| |
| // If we reached the beginning of the diff and failed to find a chunk |
| // with the given side, return null. |
| if (chunkIndex === -1) { return null; } |
| |
| return chunk; |
| }, |
| |
| /** |
| * Check whether the specified side of the diff has a trailing newline. |
| * @param {!Object} diff |
| * @param {boolean} leftSide true if checking the base of the diff, |
| * false if testing the revision. |
| * @return {boolean|null} Return true if the side has a trailing newline. |
| * Return false if it doesn't. Return null if not applicable (for |
| * example, if the diff has no content on the specified side). |
| */ |
| _hasTrailingNewlines(diff, leftSide) { |
| const chunk = this._lastChunkForSide(diff, leftSide); |
| if (!chunk) { return null; } |
| let lines; |
| if (chunk.ab) { |
| lines = chunk.ab; |
| } else { |
| lines = leftSide ? chunk.a : chunk.b; |
| } |
| return lines[lines.length - 1] === ''; |
| }, |
| |
| /** |
| * @param {!Object} diff |
| * @return {string|null} |
| */ |
| _computeNewlineWarning(diff) { |
| const hasLeft = this._hasTrailingNewlines(diff, true); |
| const hasRight = this._hasTrailingNewlines(diff, false); |
| const messages = []; |
| if (hasLeft === false) { |
| messages.push(NO_NEWLINE_BASE); |
| } |
| if (hasRight === false) { |
| messages.push(NO_NEWLINE_REVISION); |
| } |
| if (!messages.length) { return null; } |
| return messages.join(' — '); |
| }, |
| |
| /** |
| * @param {string} warning |
| * @param {boolean} loading |
| * @return {string} |
| */ |
| _computeNewlineWarningClass(warning, loading) { |
| if (loading || !warning) { return 'newlineWarning hidden'; } |
| return 'newlineWarning'; |
| }, |
| }); |
| })(); |
