blob: 24a7d7862be2ac5937fd71127e36580ca547a4b4 [file] [log] [blame]
/**
* @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.
*/
import {
ContentLoadNeededEventDetail,
MovedLinkClickedEventDetail,
RenderPreferences,
} from '../../../api/diff';
import {getBaseUrl} from '../../../utils/url-util';
import {GrDiffLine, GrDiffLineType, LineNumber} from '../gr-diff/gr-diff-line';
import {
GrDiffGroup,
GrDiffGroupType,
hideInContextControl,
} from '../gr-diff/gr-diff-group';
import {BlameInfo} from '../../../types/common';
import {DiffInfo, DiffPreferencesInfo} from '../../../types/diff';
import {DiffViewMode, Side} from '../../../constants/constants';
import {DiffLayer} from '../../../types/types';
import {pluralize} from '../../../utils/string-util';
import {fire} from '../../../utils/event-util';
/**
* In JS, unicode code points above 0xFFFF occupy two elements of a string.
* For example '𐀏'.length is 2. An occurrence of such a code point is called a
* surrogate pair.
*
* This regex segments a string along tabs ('\t') and surrogate pairs, since
* these are two cases where '1 char' does not automatically imply '1 column'.
*
* TODO: For human languages whose orthographies use combining marks, this
* approach won't correctly identify the grapheme boundaries. In those cases,
* a grapheme consists of multiple code points that should count as only one
* character against the column limit. Getting that correct (if it's desired)
* is probably beyond the limits of a regex, but there are nonstandard APIs to
* do this, and proposed (but, as of Nov 2017, unimplemented) standard APIs.
*
* Further reading:
* On Unicode in JS: https://mathiasbynens.be/notes/javascript-unicode
* Graphemes: http://unicode.org/reports/tr29/#Grapheme_Cluster_Boundaries
* A proposed JS API: https://github.com/tc39/proposal-intl-segmenter
*/
const REGEX_TAB_OR_SURROGATE_PAIR = /\t|[\uD800-\uDBFF][\uDC00-\uDFFF]/;
const PARTIAL_CONTEXT_AMOUNT = 10;
enum ContextButtonType {
ABOVE = 'above',
BELOW = 'below',
ALL = 'all',
}
export interface DiffContextExpandedEventDetail {
groups: GrDiffGroup[];
section: HTMLElement;
numLines: number;
}
declare global {
interface HTMLElementEventMap {
'diff-context-expanded': CustomEvent<DiffContextExpandedEventDetail>;
}
}
export abstract class GrDiffBuilder {
private readonly _diff: DiffInfo;
private readonly _numLinesLeft: number;
private readonly _prefs: DiffPreferencesInfo;
private readonly _renderPrefs?: RenderPreferences;
protected readonly _outputEl: HTMLElement;
readonly groups: GrDiffGroup[];
private blameInfo: BlameInfo[] | null;
private readonly _layerUpdateListener: (
start: LineNumber,
end: LineNumber,
side: Side
) => void;
constructor(
diff: DiffInfo,
prefs: DiffPreferencesInfo,
outputEl: HTMLElement,
readonly layers: DiffLayer[] = [],
renderPrefs?: RenderPreferences
) {
this._diff = diff;
this._numLinesLeft = this._diff.content
? this._diff.content.reduce((sum, chunk) => {
const left = chunk.a || chunk.ab;
return sum + (left?.length || chunk.skip || 0);
}, 0)
: 0;
this._prefs = prefs;
this._renderPrefs = renderPrefs;
this._outputEl = outputEl;
this.groups = [];
this.blameInfo = null;
if (isNaN(prefs.tab_size) || prefs.tab_size <= 0) {
throw Error('Invalid tab size from preferences.');
}
if (isNaN(prefs.line_length) || prefs.line_length <= 0) {
throw Error('Invalid line length from preferences.');
}
this._layerUpdateListener = (
start: LineNumber,
end: LineNumber,
side: Side
) => this._handleLayerUpdate(start, end, side);
for (const layer of this.layers) {
if (layer.addListener) {
layer.addListener(this._layerUpdateListener);
}
}
}
clear() {
for (const layer of this.layers) {
if (layer.removeListener) {
layer.removeListener(this._layerUpdateListener);
}
}
}
// TODO(TS): Convert to enum.
static readonly GroupType = {
ADDED: 'b',
BOTH: 'ab',
REMOVED: 'a',
};
// TODO(TS): Convert to enum.
static readonly Highlights = {
ADDED: 'edit_b',
REMOVED: 'edit_a',
};
// TODO(TS): Replace usages with ContextButtonType enum.
static readonly ContextButtonType = {
ABOVE: 'above',
BELOW: 'below',
ALL: 'all',
};
abstract addColumns(outputEl: HTMLElement, fontSize: number): void;
abstract buildSectionElement(group: GrDiffGroup): HTMLElement;
emitGroup(group: GrDiffGroup, beforeSection: HTMLElement | null) {
const element = this.buildSectionElement(group);
this._outputEl.insertBefore(element, beforeSection);
group.element = element;
}
getGroupsByLineRange(
startLine: LineNumber,
endLine: LineNumber,
side?: Side
) {
const groups = [];
for (let i = 0; i < this.groups.length; i++) {
const group = this.groups[i];
if (group.lines.length === 0) {
continue;
}
let groupStartLine = 0;
let groupEndLine = 0;
if (side) {
const range =
side === Side.LEFT ? group.lineRange.left : group.lineRange.right;
groupStartLine = range.start_line;
groupEndLine = range.end_line;
}
if (groupStartLine === 0) {
// Line was removed or added.
groupStartLine = groupEndLine;
}
if (groupEndLine === 0) {
// Line was removed or added.
groupEndLine = groupStartLine;
}
if (startLine <= groupEndLine && endLine >= groupStartLine) {
groups.push(group);
}
}
return groups;
}
getContentTdByLine(
lineNumber: LineNumber,
side?: Side,
root: Element = this._outputEl
): Element | null {
const sideSelector: string = side ? `.${side}` : '';
return root.querySelector(
`td.lineNum[data-value="${lineNumber}"]${sideSelector} ~ td.content`
);
}
getContentByLine(
lineNumber: LineNumber,
side?: Side,
root?: HTMLElement
): HTMLElement | null {
const td = this.getContentTdByLine(lineNumber, side, root);
return td ? td.querySelector('.contentText') : null;
}
/**
* Find line elements or line objects by a range of line numbers and a side.
*
* @param start The first line number
* @param end The last line number
* @param side The side of the range. Either 'left' or 'right'.
* @param out_lines The output list of line objects. Use null if not desired.
* @param out_elements The output list of line elements. Use null if not
* desired.
*/
findLinesByRange(
start: LineNumber,
end: LineNumber,
side: Side,
out_lines: GrDiffLine[] | null,
out_elements: HTMLElement[] | null
) {
const groups = this.getGroupsByLineRange(start, end, side);
for (const group of groups) {
let content: HTMLElement | null = null;
for (const line of group.lines) {
if (
(side === 'left' && line.type === GrDiffLineType.ADD) ||
(side === 'right' && line.type === GrDiffLineType.REMOVE)
) {
continue;
}
const lineNumber =
side === 'left' ? line.beforeNumber : line.afterNumber;
if (lineNumber < start || lineNumber > end) {
continue;
}
if (out_lines) {
out_lines.push(line);
}
if (out_elements) {
if (content) {
content = this._getNextContentOnSide(content, side);
} else {
content = this.getContentByLine(lineNumber, side, group.element);
}
if (content) {
out_elements.push(content);
}
}
}
}
}
/**
* Re-renders the DIV.contentText elements for the given side and range of
* diff content.
*/
_renderContentByRange(start: LineNumber, end: LineNumber, side: Side) {
const lines: GrDiffLine[] = [];
const elements: HTMLElement[] = [];
let line;
let el;
this.findLinesByRange(start, end, side, lines, elements);
for (let i = 0; i < lines.length; i++) {
line = lines[i];
el = elements[i];
if (!el || !el.parentElement) {
// Cannot re-render an element if it does not exist. This can happen
// if lines are collapsed and not visible on the page yet.
continue;
}
const lineNumberEl = this._getLineNumberEl(el, side);
el.parentElement.replaceChild(
this._createTextEl(lineNumberEl, line, side).firstChild!,
el
);
}
}
getSectionsByLineRange(
startLine: LineNumber,
endLine: LineNumber,
side: Side
) {
return this.getGroupsByLineRange(startLine, endLine, side).map(
group => group.element
);
}
_createContextControls(
section: HTMLElement,
contextGroups: GrDiffGroup[],
viewMode: DiffViewMode
) {
const leftStart = contextGroups[0].lineRange.left.start_line;
const leftEnd =
contextGroups[contextGroups.length - 1].lineRange.left.end_line;
const numLines = leftEnd - leftStart + 1;
if (numLines === 0) console.error('context group without lines');
const firstGroupIsSkipped = !!contextGroups[0].skip;
const lastGroupIsSkipped = !!contextGroups[contextGroups.length - 1].skip;
const showAbove = leftStart > 1 && !firstGroupIsSkipped;
const showBelow = leftEnd < this._numLinesLeft && !lastGroupIsSkipped;
if (showAbove) {
const paddingRow = this._createContextControlPaddingRow(viewMode);
paddingRow.classList.add('above');
section.appendChild(paddingRow);
}
section.appendChild(
this._createContextControlRow(
section,
contextGroups,
showAbove,
showBelow,
numLines
)
);
if (showBelow) {
const paddingRow = this._createContextControlPaddingRow(viewMode);
paddingRow.classList.add('below');
section.appendChild(paddingRow);
}
}
/**
* Creates context controls. Buttons extend from the gap created by this
* method up or down into the area of code that they affect.
*/
_createContextControlRow(
section: HTMLElement,
contextGroups: GrDiffGroup[],
showAbove: boolean,
showBelow: boolean,
numLines: number
): HTMLElement {
const row = this._createElement('tr', 'contextDivider');
if (!(showAbove && showBelow)) {
row.classList.add('collapsed');
}
const element = this._createElement('td', 'dividerCell');
row.appendChild(element);
const showAllContainer = this._createElement('div', 'aboveBelowButtons');
element.appendChild(showAllContainer);
const showAllButton = this._createContextButton(
ContextButtonType.ALL,
section,
contextGroups,
numLines
);
showAllButton.classList.add(
showAbove && showBelow
? 'centeredButton'
: showAbove
? 'aboveButton'
: 'belowButton'
);
showAllContainer.appendChild(showAllButton);
const showPartialLinks = numLines > PARTIAL_CONTEXT_AMOUNT;
if (showPartialLinks) {
const container = this._createElement('div', 'aboveBelowButtons');
if (showAbove) {
container.appendChild(
this._createContextButton(
ContextButtonType.ABOVE,
section,
contextGroups,
numLines
)
);
}
if (showBelow) {
container.appendChild(
this._createContextButton(
ContextButtonType.BELOW,
section,
contextGroups,
numLines
)
);
}
element.appendChild(container);
}
return row;
}
/**
* Creates a table row to serve as padding between code and context controls.
* Blame column, line gutters, and content area will continue visually, but
* context controls can render over this background to map more clearly to
* the area of code they expand.
*/
_createContextControlPaddingRow(viewMode: DiffViewMode) {
const row = this._createElement('tr', 'contextBackground');
if (viewMode === DiffViewMode.SIDE_BY_SIDE) {
row.classList.add('side-by-side');
row.setAttribute('left-type', GrDiffGroupType.CONTEXT_CONTROL);
row.setAttribute('right-type', GrDiffGroupType.CONTEXT_CONTROL);
} else {
row.classList.add('unified');
}
row.appendChild(this._createBlameCell(0));
row.appendChild(this._createElement('td', 'contextLineNum'));
if (viewMode === DiffViewMode.SIDE_BY_SIDE) {
row.appendChild(this._createElement('td'));
}
row.appendChild(this._createElement('td', 'contextLineNum'));
row.appendChild(this._createElement('td'));
return row;
}
_createContextButton(
type: ContextButtonType,
section: HTMLElement,
contextGroups: GrDiffGroup[],
numLines: number
) {
const context = PARTIAL_CONTEXT_AMOUNT;
const button = this._createElement('gr-button', 'showContext');
button.classList.add('contextControlButton');
button.setAttribute('link', 'true');
button.setAttribute('no-uppercase', 'true');
let text = '';
let groups: GrDiffGroup[] = []; // The groups that replace this one if tapped.
let requiresLoad = false;
if (type === GrDiffBuilder.ContextButtonType.ALL) {
text = `+${pluralize(numLines, 'common line')}`;
button.setAttribute(
'aria-label',
`Show ${pluralize(numLines, 'common line')}`
);
requiresLoad = contextGroups.find(c => !!c.skip) !== undefined;
if (requiresLoad) {
// Expanding content would require load of more data
text += ' (too large)';
}
groups.push(...contextGroups);
} else if (type === GrDiffBuilder.ContextButtonType.ABOVE) {
groups = hideInContextControl(contextGroups, context, numLines);
text = `+${context}`;
button.classList.add('aboveButton');
button.setAttribute(
'aria-label',
`Show ${pluralize(context, 'line')} above`
);
} else if (type === GrDiffBuilder.ContextButtonType.BELOW) {
groups = hideInContextControl(contextGroups, 0, numLines - context);
text = `+${context}`;
button.classList.add('belowButton');
button.setAttribute(
'aria-label',
`Show ${pluralize(context, 'line')} below`
);
}
const textSpan = this._createElement('span', 'showContext');
textSpan.textContent = text;
button.appendChild(textSpan);
if (requiresLoad) {
button.addEventListener('click', e => {
e.stopPropagation();
const firstRange = groups[0].lineRange;
const lastRange = groups[groups.length - 1].lineRange;
const lineRange = {
left: {
start_line: firstRange.left.start_line,
end_line: lastRange.left.end_line,
},
right: {
start_line: firstRange.right.start_line,
end_line: lastRange.right.end_line,
},
};
fire<ContentLoadNeededEventDetail>(button, 'content-load-needed', {
lineRange,
});
});
} else {
button.addEventListener('click', e => {
e.stopPropagation();
fire<DiffContextExpandedEventDetail>(button, 'diff-context-expanded', {
groups,
section,
numLines,
});
});
}
return button;
}
_createLineEl(
line: GrDiffLine,
number: LineNumber,
type: GrDiffLineType,
side: Side
) {
const td = this._createElement('td');
td.classList.add(side);
if (line.type === GrDiffLineType.BLANK) {
return td;
}
if (line.type === GrDiffLineType.BOTH || line.type === type) {
td.classList.add('lineNum');
td.dataset['value'] = number.toString();
if (
((this._prefs.show_file_comment_button === false ||
this._renderPrefs?.show_file_comment_button === false) &&
number === 'FILE') ||
number === 'LOST'
) {
return td;
}
const button = this._createElement('button');
td.appendChild(button);
button.tabIndex = -1;
button.classList.add('lineNumButton');
button.classList.add(side);
button.dataset['value'] = number.toString();
button.textContent = number === 'FILE' ? 'File' : number.toString();
if (number === 'FILE') {
button.setAttribute('aria-label', 'Add file comment');
}
// Add aria-labels for valid line numbers.
// For unified diff, this method will be called with number set to 0 for
// the empty line number column for added/removed lines. This should not
// be announced to the screenreader.
if (number > 0) {
if (line.type === GrDiffLineType.REMOVE) {
button.setAttribute('aria-label', `${number} removed`);
} else if (line.type === GrDiffLineType.ADD) {
button.setAttribute('aria-label', `${number} added`);
}
}
}
return td;
}
_createTextEl(
lineNumberEl: HTMLElement | null,
line: GrDiffLine,
side?: Side
) {
const td = this._createElement('td');
if (line.type !== GrDiffLineType.BLANK) {
td.classList.add('content');
}
// If intraline info is not available, the entire line will be
// considered as changed and marked as dark red / green color
if (!line.hasIntralineInfo) {
td.classList.add('no-intraline-info');
}
td.classList.add(line.type);
if (line.beforeNumber !== 'FILE' && line.beforeNumber !== 'LOST') {
const lineLimit = !this._prefs.line_wrapping
? this._prefs.line_length
: Infinity;
const contentText = this._formatText(
line.text,
this._prefs.tab_size,
lineLimit
);
if (side) {
contentText.setAttribute('data-side', side);
}
if (lineNumberEl) {
for (const layer of this.layers) {
if (typeof layer.annotate === 'function') {
layer.annotate(contentText, lineNumberEl, line);
}
}
} else {
console.error('The lineNumberEl is null, skipping layer annotations.');
}
td.appendChild(contentText);
} else if (line.beforeNumber === 'FILE') td.classList.add('file');
else if (line.beforeNumber === 'LOST') td.classList.add('lost');
return td;
}
/**
* Returns a 'div' element containing the supplied |text| as its innerText,
* with '\t' characters expanded to a width determined by |tabSize|, and the
* text wrapped at column |lineLimit|, which may be Infinity if no wrapping is
* desired.
*
* @param text The text to be formatted.
* @param tabSize The width of each tab stop.
* @param lineLimit The column after which to wrap lines.
*/
_formatText(text: string, tabSize: number, lineLimit: number): HTMLElement {
const contentText = this._createElement('div', 'contentText');
let columnPos = 0;
let textOffset = 0;
for (const segment of text.split(REGEX_TAB_OR_SURROGATE_PAIR)) {
if (segment) {
// |segment| contains only normal characters. If |segment| doesn't fit
// entirely on the current line, append chunks of |segment| followed by
// line breaks.
let rowStart = 0;
let rowEnd = lineLimit - columnPos;
while (rowEnd < segment.length) {
contentText.appendChild(
document.createTextNode(segment.substring(rowStart, rowEnd))
);
contentText.appendChild(this._createElement('span', 'br'));
columnPos = 0;
rowStart = rowEnd;
rowEnd += lineLimit;
}
// Append the last part of |segment|, which fits on the current line.
contentText.appendChild(
document.createTextNode(segment.substring(rowStart))
);
columnPos += segment.length - rowStart;
textOffset += segment.length;
}
if (textOffset < text.length) {
// Handle the special character at |textOffset|.
if (text.startsWith('\t', textOffset)) {
// Append a single '\t' character.
let effectiveTabSize = tabSize - (columnPos % tabSize);
if (columnPos + effectiveTabSize > lineLimit) {
contentText.appendChild(this._createElement('span', 'br'));
columnPos = 0;
effectiveTabSize = tabSize;
}
contentText.appendChild(this._getTabWrapper(effectiveTabSize));
columnPos += effectiveTabSize;
textOffset++;
} else {
// Append a single surrogate pair.
if (columnPos >= lineLimit) {
contentText.appendChild(this._createElement('span', 'br'));
columnPos = 0;
}
contentText.appendChild(
document.createTextNode(text.substring(textOffset, textOffset + 2))
);
textOffset += 2;
columnPos += 1;
}
}
}
return contentText;
}
/**
* Returns a <span> element holding a '\t' character, that will visually
* occupy |tabSize| many columns.
*
* @param tabSize The effective size of this tab stop.
*/
_getTabWrapper(tabSize: number): HTMLElement {
// Force this to be a number to prevent arbitrary injection.
const result = this._createElement('span', 'tab');
result.setAttribute(
'style',
`tab-size: ${tabSize}; -moz-tab-size: ${tabSize};`
);
result.innerText = '\t';
return result;
}
_createElement(tagName: string, classStr?: string): HTMLElement {
const el = document.createElement(tagName);
// When Shady DOM is being used, these classes are added to account for
// Polymer's polyfill behavior. In order to guarantee sufficient
// specificity within the CSS rules, these are added to every element.
// Since the Polymer DOM utility functions (which would do this
// automatically) are not being used for performance reasons, this is
// done manually.
el.classList.add('style-scope', 'gr-diff');
if (classStr) {
for (const className of classStr.split(' ')) {
el.classList.add(className);
}
}
return el;
}
_handleLayerUpdate(start: LineNumber, end: LineNumber, side: Side) {
this._renderContentByRange(start, end, side);
}
/**
* Finds the next DIV.contentText element following the given element, and on
* the same side. Will only search within a group.
*/
abstract _getNextContentOnSide(
content: HTMLElement,
side: Side
): HTMLElement | null;
/**
* Gets configuration for creating move controls for chunks marked with
* dueToMove
*/
abstract _getMoveControlsConfig(): {
numberOfCells: number;
movedOutIndex: number;
movedInIndex: number;
};
/**
* Determines whether the given group is either totally an addition or totally
* a removal.
*/
_isTotal(group: GrDiffGroup): boolean {
return (
group.type === GrDiffGroupType.DELTA &&
(!group.adds.length || !group.removes.length) &&
!(!group.adds.length && !group.removes.length)
);
}
/**
* Set the blame information for the diff. For any already-rendered line,
* re-render its blame cell content.
*/
setBlame(blame: BlameInfo[] | null) {
this.blameInfo = blame;
if (!blame) return;
// TODO(wyatta): make this loop asynchronous.
for (const commit of blame) {
for (const range of commit.ranges) {
for (let i = range.start; i <= range.end; i++) {
// TODO(wyatta): this query is expensive, but, when traversing a
// range, the lines are consecutive, and given the previous blame
// cell, the next one can be reached cheaply.
const el = this._getBlameByLineNum(i);
if (!el) {
continue;
}
// Remove the element's children (if any).
while (el.hasChildNodes()) {
el.removeChild(el.lastChild!);
}
const blame = this._getBlameForBaseLine(i, commit);
if (blame) el.appendChild(blame);
}
}
}
}
_createMovedLineAnchor(line: number, side: Side) {
const anchor = this._createElementWithText('a', `${line}`);
// href is not actually used but important for Screen Readers
anchor.setAttribute('href', `#${line}`);
anchor.addEventListener('click', e => {
e.preventDefault();
anchor.dispatchEvent(
new CustomEvent<MovedLinkClickedEventDetail>('moved-link-clicked', {
detail: {
lineNum: line,
side,
},
composed: true,
bubbles: true,
})
);
});
return anchor;
}
_createElementWithText(tagName: string, textContent: string) {
const element = this._createElement(tagName);
element.textContent = textContent;
return element;
}
_createMoveDescriptionDiv(movedIn: boolean, group: GrDiffGroup) {
const div = this._createElement('div');
if (group.moveDetails?.range) {
const {changed, range} = group.moveDetails;
const otherSide = movedIn ? Side.LEFT : Side.RIGHT;
const andChangedLabel = changed ? 'and changed ' : '';
const direction = movedIn ? 'from' : 'to';
const textLabel = `Moved ${andChangedLabel}${direction} lines `;
div.appendChild(this._createElementWithText('span', textLabel));
div.appendChild(this._createMovedLineAnchor(range.start, otherSide));
div.appendChild(this._createElementWithText('span', ' - '));
div.appendChild(this._createMovedLineAnchor(range.end, otherSide));
} else {
div.appendChild(
this._createElementWithText('span', movedIn ? 'Moved in' : 'Moved out')
);
}
return div;
}
_buildMoveControls(group: GrDiffGroup) {
const movedIn = group.adds.length > 0;
const {
numberOfCells,
movedOutIndex,
movedInIndex,
} = this._getMoveControlsConfig();
let controlsClass;
let descriptionIndex;
const descriptionTextDiv = this._createMoveDescriptionDiv(movedIn, group);
if (movedIn) {
controlsClass = 'movedIn';
descriptionIndex = movedInIndex;
} else {
controlsClass = 'movedOut';
descriptionIndex = movedOutIndex;
}
const controls = this._createElement('tr', `moveControls ${controlsClass}`);
const cells = [...Array(numberOfCells).keys()].map(() =>
this._createElement('td')
);
const moveDescriptionDiv = this._createElement('div', 'moveDescription');
const icon = this._createElement('iron-icon');
icon.setAttribute('icon', 'gr-icons:move-item');
moveDescriptionDiv.appendChild(icon);
moveDescriptionDiv.appendChild(descriptionTextDiv);
cells[descriptionIndex].appendChild(moveDescriptionDiv);
cells[descriptionIndex].classList.add('moveLabel');
cells.forEach(c => {
controls.appendChild(c);
});
return controls;
}
/**
* Find the blame cell for a given line number.
*/
_getBlameByLineNum(lineNum: number): Element | null {
return this._outputEl.querySelector(
`td.blame[data-line-number="${lineNum}"]`
);
}
/**
* Given a base line number, return the commit containing that line in the
* current set of blame information. If no blame information has been
* provided, null is returned.
*
* @return The commit information.
*/
_getBlameCommitForBaseLine(lineNum: LineNumber) {
if (!this.blameInfo) {
return null;
}
for (const blameCommit of this.blameInfo) {
for (const range of blameCommit.ranges) {
if (range.start <= lineNum && range.end >= lineNum) {
return blameCommit;
}
}
}
return null;
}
/**
* Given the number of a base line, get the content for the blame cell of that
* line. If there is no blame information for that line, returns null.
*
* @param commit Optionally provide the commit object, so that
* it does not need to be searched.
*/
_getBlameForBaseLine(
lineNum: LineNumber,
commit: BlameInfo | null = this._getBlameCommitForBaseLine(lineNum)
): HTMLElement | null {
if (!commit) {
return null;
}
const isStartOfRange = commit.ranges.some(r => r.start === lineNum);
const date = new Date(commit.time * 1000).toLocaleDateString();
const blameNode = this._createElement(
'span',
isStartOfRange ? 'startOfRange' : ''
);
const shaNode = this._createElement('a', 'blameDate');
shaNode.innerText = `${date}`;
shaNode.setAttribute('href', `${getBaseUrl()}/q/${commit.id}`);
blameNode.appendChild(shaNode);
const shortName = commit.author.split(' ')[0];
const authorNode = this._createElement('span', 'blameAuthor');
authorNode.innerText = ` ${shortName}`;
blameNode.appendChild(authorNode);
const hoverCardFragment = this._createElement('span', 'blameHoverCard');
hoverCardFragment.innerText = `Commit ${commit.id}
Author: ${commit.author}
Date: ${date}
${commit.commit_msg}`;
const hovercard = this._createElement('gr-hovercard');
hovercard.appendChild(hoverCardFragment);
blameNode.appendChild(hovercard);
return blameNode;
}
/**
* Create a blame cell for the given base line. Blame information will be
* included in the cell if available.
*/
_createBlameCell(lineNumber: LineNumber): HTMLTableDataCellElement {
const blameTd = this._createElement(
'td',
'blame'
) as HTMLTableDataCellElement;
blameTd.setAttribute('data-line-number', lineNumber.toString());
if (lineNumber) {
const content = this._getBlameForBaseLine(lineNumber);
if (content) {
blameTd.appendChild(content);
}
}
return blameTd;
}
/**
* Finds the line number element given the content element by walking up the
* DOM tree to the diff row and then querying for a .lineNum element on the
* requested side.
*
* TODO(brohlfs): Consolidate this with getLineEl... methods in html file.
*/
_getLineNumberEl(content: HTMLElement, side: Side): HTMLElement | null {
let row: HTMLElement | null = content;
while (row && !row.classList.contains('diff-row')) row = row.parentElement;
return row ? (row.querySelector('.lineNum.' + side) as HTMLElement) : null;
}
}