blob: 1c093722b5e168bf822330968f9e1835cae1bfeb [file] [log] [blame]
/**
* @license
* Copyright 2022 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import {html, LitElement} from 'lit';
import {customElement, property, state} from 'lit/decorators.js';
import {
DiffInfo,
DiffLayer,
DiffViewMode,
MovedLinkClickedEventDetail,
RenderPreferences,
Side,
LineNumber,
DiffPreferencesInfo,
} from '../../../api/diff';
import {GrDiffGroup, GrDiffGroupType} from '../gr-diff/gr-diff-group';
import {countLines, diffClasses} from '../gr-diff/gr-diff-utils';
import {GrDiffRow} from './gr-diff-row';
import '../gr-context-controls/gr-context-controls-section';
import '../gr-context-controls/gr-context-controls';
import '../gr-range-header/gr-range-header';
import './gr-diff-row';
@customElement('gr-diff-section')
export class GrDiffSection extends LitElement {
@property({type: Object})
group?: GrDiffGroup;
@property({type: Object})
diff?: DiffInfo;
@property({type: Object})
renderPrefs?: RenderPreferences;
@property({type: Object})
diffPrefs?: DiffPreferencesInfo;
@property({type: Object})
layers: DiffLayer[] = [];
/**
* Semantic DOM diff testing does not work with just table fragments, so when
* running such tests the render() method has to wrap the DOM in a proper
* <table> element.
*/
@state()
addTableWrapperForTesting = false;
/**
* The browser API for handling selection does not (yet) work for selection
* across multiple shadow DOM elements. So we are rendering gr-diff components
* into the light DOM instead of the shadow DOM by overriding this method,
* which was the recommended workaround by the lit team.
* See also https://github.com/WICG/webcomponents/issues/79.
*/
override createRenderRoot() {
return this;
}
override render() {
if (!this.group) return;
const extras: string[] = [];
extras.push('section');
extras.push(this.group.type);
if (this.group.isTotal()) extras.push('total');
if (this.group.dueToRebase) extras.push('dueToRebase');
if (this.group.moveDetails) extras.push('dueToMove');
if (this.group.moveDetails?.changed) extras.push('changed');
if (this.group.ignoredWhitespaceOnly) extras.push('ignoredWhitespaceOnly');
const pairs = this.getLinePairs();
const body = html`
<tbody class=${diffClasses(...extras)}>
${this.renderContextControls()} ${this.renderMoveControls()}
${pairs.map(pair => {
const leftCl = `left-${pair.left.lineNumber(Side.LEFT)}`;
const rightCl = `right-${pair.right.lineNumber(Side.RIGHT)}`;
return html`
<gr-diff-row
class="${leftCl} ${rightCl}"
.left=${pair.left}
.right=${pair.right}
.layers=${this.layers}
.lineLength=${this.diffPrefs?.line_length ?? 80}
.tabSize=${this.diffPrefs?.tab_size ?? 2}
.unifiedDiff=${this.isUnifiedDiff()}
>
</gr-diff-row>
`;
})}
</tbody>
`;
if (this.addTableWrapperForTesting) {
return html`<table>
${body}
</table>`;
}
return body;
}
private isUnifiedDiff() {
return this.renderPrefs?.view_mode === DiffViewMode.UNIFIED;
}
getLinePairs() {
if (!this.group) return [];
const isControl = this.group.type === GrDiffGroupType.CONTEXT_CONTROL;
if (isControl) return [];
return this.isUnifiedDiff()
? this.group.getUnifiedPairs()
: this.group.getSideBySidePairs();
}
getDiffRows(): GrDiffRow[] {
return [...this.querySelectorAll<GrDiffRow>('gr-diff-row')];
}
private renderContextControls() {
if (this.group?.type !== GrDiffGroupType.CONTEXT_CONTROL) return;
const leftStart = this.group.lineRange.left.start_line;
const leftEnd = this.group.lineRange.left.end_line;
const firstGroupIsSkipped = !!this.group.contextGroups[0].skip;
const lastGroupIsSkipped =
!!this.group.contextGroups[this.group.contextGroups.length - 1].skip;
const lineCountLeft = countLines(this.diff, Side.LEFT);
const containsWholeFile = lineCountLeft === leftEnd - leftStart + 1;
const showAbove =
(leftStart > 1 && !firstGroupIsSkipped) || containsWholeFile;
const showBelow = leftEnd < lineCountLeft && !lastGroupIsSkipped;
return html`
<gr-context-controls-section
.showAbove=${showAbove}
.showBelow=${showBelow}
.group=${this.group}
.diff=${this.diff}
.renderPrefs=${this.renderPrefs}
>
</gr-context-controls-section>
`;
}
findRow(side: Side, lineNumber: LineNumber): GrDiffRow | undefined {
return (
this.querySelector<GrDiffRow>(`gr-diff-row.${side}-${lineNumber}`) ??
undefined
);
}
private renderMoveControls() {
if (!this.group?.moveDetails) return;
const movedIn = this.group.adds.length > 0;
const plainCell = html`<td class=${diffClasses()}></td>`;
const signCell = html`<td class=${diffClasses('sign')}></td>`;
const lineNumberCell = html`
<td class=${diffClasses('moveControlsLineNumCol')}></td>
`;
const moveCell = html`
<td class=${diffClasses('moveHeader')}>
<gr-range-header class=${diffClasses()} icon="gr-icons:move-item">
${this.renderMoveDescription(movedIn)}
</gr-range-header>
</td>
`;
return html`
<tr
class=${diffClasses('moveControls', movedIn ? 'movedIn' : 'movedOut')}
>
${lineNumberCell} ${signCell} ${movedIn ? plainCell : moveCell}
${lineNumberCell} ${signCell} ${movedIn ? moveCell : plainCell}
</tr>
`;
}
private renderMoveDescription(movedIn: boolean) {
if (this.group?.moveDetails?.range) {
const {changed, range} = this.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 `;
return html`
<div class=${diffClasses()}>
<span class=${diffClasses()}>${textLabel}</span>
${this.renderMovedLineAnchor(range.start, otherSide)}
<span class=${diffClasses()}> - </span>
${this.renderMovedLineAnchor(range.end, otherSide)}
</div>
`;
}
return html`
<div class=${diffClasses()}>
<span class=${diffClasses()}
>${movedIn ? 'Moved in' : 'Moved out'}</span
>
</div>
`;
}
private renderMovedLineAnchor(line: number, side: Side) {
const listener = (e: MouseEvent) => {
e.preventDefault();
this.handleMovedLineAnchorClick(e.target, side, line);
};
// `href` is not actually used but important for Screen Readers
return html`
<a class=${diffClasses()} href=${`#${line}`} @click=${listener}
>${line}</a
>
`;
}
private handleMovedLineAnchorClick(
anchor: EventTarget | null,
side: Side,
line: number
) {
anchor?.dispatchEvent(
new CustomEvent<MovedLinkClickedEventDetail>('moved-link-clicked', {
detail: {
lineNum: line,
side,
},
composed: true,
bubbles: true,
})
);
}
}
declare global {
interface HTMLElementTagNameMap {
'gr-diff-section': GrDiffSection;
}
}