blob: 2ef400621d2717a96042d0465422c7855114b23b [file] [log] [blame]
/**
* @license
* Copyright 2016 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import {
ContentLoadNeededEventDetail,
DiffContextExpandedExternalDetail,
RenderPreferences,
} from '../../../api/diff';
import {GrDiffLine, GrDiffLineType, LineNumber} from '../gr-diff/gr-diff-line';
import {GrDiffGroup} from '../gr-diff/gr-diff-group';
import '../gr-context-controls/gr-context-controls';
import {BlameInfo} from '../../../types/common';
import {DiffInfo, DiffPreferencesInfo} from '../../../types/diff';
import {Side} from '../../../constants/constants';
import {DiffLayer} from '../../../types/types';
export interface DiffContextExpandedEventDetail
extends DiffContextExpandedExternalDetail {
/** The context control group that should be replaced by `groups`. */
contextGroup: GrDiffGroup;
groups: GrDiffGroup[];
numLines: number;
}
declare global {
interface HTMLElementEventMap {
'diff-context-expanded': CustomEvent<DiffContextExpandedEventDetail>;
'content-load-needed': CustomEvent<ContentLoadNeededEventDetail>;
}
}
/**
* Given that GrDiffBuilder has ~1,000 lines of code, this interface is just
* making refactorings easier by emphasizing what the public facing "contract"
* of this class is. There are no plans for adding separate implementations.
*/
export interface DiffBuilder {
clear(): void;
addGroups(groups: readonly GrDiffGroup[]): void;
clearGroups(): void;
replaceGroup(
contextControl: GrDiffGroup,
groups: readonly GrDiffGroup[]
): void;
findGroup(side: Side, line: LineNumber): GrDiffGroup | undefined;
addColumns(outputEl: HTMLElement, fontSize: number): void;
// TODO: Change `null` to `undefined`.
getContentTdByLine(
lineNumber: LineNumber,
side?: Side,
root?: Element
): HTMLTableCellElement | null;
getLineElByNumber(
lineNumber: LineNumber,
side?: Side
): HTMLTableCellElement | null;
getLineNumberRows(): HTMLTableRowElement[];
getLineNumEls(side: Side): HTMLTableCellElement[];
setBlame(blame: BlameInfo[]): void;
updateRenderPrefs(renderPrefs: RenderPreferences): void;
}
/**
* Base class for different diff builders, like side-by-side, unified etc.
*
* The builder takes GrDiffGroups, and builds the corresponding DOM elements,
* called sections. Only the builder should add or remove sections from the
* DOM. Callers can use the ...group() methods to modify groups and thus cause
* rendering changes.
*
* TODO: Do not subclass `GrDiffBuilder`. Use composition and interfaces.
*/
export abstract class GrDiffBuilder implements DiffBuilder {
protected readonly _diff: DiffInfo;
protected readonly numLinesLeft: number;
// visible for testing
readonly _prefs: DiffPreferencesInfo;
protected readonly renderPrefs?: RenderPreferences;
protected readonly outputEl: HTMLElement;
protected groups: GrDiffGroup[];
private blameInfo: BlameInfo[] = [];
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 = [];
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.renderContentByRange(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);
}
}
}
abstract addColumns(outputEl: HTMLElement, fontSize: number): void;
protected abstract buildSectionElement(group: GrDiffGroup): HTMLElement;
addGroups(groups: readonly GrDiffGroup[]) {
for (const group of groups) {
this.groups.push(group);
this.emitGroup(group);
}
}
clearGroups() {
for (const deletedGroup of this.groups) {
deletedGroup.element?.remove();
}
this.groups = [];
}
replaceGroup(contextControl: GrDiffGroup, groups: readonly GrDiffGroup[]) {
const i = this.groups.indexOf(contextControl);
if (i === -1) throw new Error('cannot find context control group');
const contextControlSection = this.groups[i].element;
if (!contextControlSection) throw new Error('diff group element not set');
this.groups.splice(i, 1, ...groups);
for (const group of groups) {
this.emitGroup(group, contextControlSection);
}
if (contextControlSection) contextControlSection.remove();
}
findGroup(side: Side, line: LineNumber) {
return this.groups.find(group => group.containsLine(side, line));
}
private emitGroup(group: GrDiffGroup, beforeSection?: HTMLElement) {
const element = this.buildSectionElement(group);
this.outputEl.insertBefore(element, beforeSection ?? null);
group.element = element;
}
// visible for testing
getGroupsByLineRange(
startLine: LineNumber,
endLine: LineNumber,
side: Side
): GrDiffGroup[] {
const startIndex = this.groups.findIndex(group =>
group.containsLine(side, startLine)
);
if (startIndex === -1) return [];
let endIndex = this.groups.findIndex(group =>
group.containsLine(side, endLine)
);
// Not all groups may have been processed yet (i.e. this.groups is still
// incomplete). In that case let's just return *all* groups until the end
// of the array.
if (endIndex === -1) endIndex = this.groups.length - 1;
// The filter preserves the legacy behavior to only return non-context
// groups
return this.groups
.slice(startIndex, endIndex + 1)
.filter(group => group.lines.length > 0);
}
// TODO: Change `null` to `undefined`.
abstract getContentTdByLine(
lineNumber: LineNumber,
side?: Side,
root?: Element
): HTMLTableCellElement | null;
// TODO: Change `null` to `undefined`.
abstract getLineElByNumber(
lineNumber: LineNumber,
side?: Side
): HTMLTableCellElement | null;
abstract getLineNumberRows(): HTMLTableRowElement[];
abstract getLineNumEls(side: Side): HTMLTableCellElement[];
protected abstract getBlameTdByLine(lineNum: number): Element | undefined;
// TODO: Change `null` to `undefined`.
protected abstract getContentByLine(
lineNumber: LineNumber,
side?: Side,
root?: HTMLElement
): HTMLElement | 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.
* TODO: Change `null` to `undefined` in paramete type. Also: Do we
* really need to support null/undefined? Also change to camelCase.
* @param out_elements The output list of line elements. Use null if not
* desired.
* TODO: Change `null` to `undefined` in paramete type. Also: Do we
* really need to support null/undefined? Also change to camelCase.
*/
// visible for testing
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);
}
}
}
}
}
protected abstract renderContentByRange(
start: LineNumber,
end: LineNumber,
side: Side
): void;
protected abstract renderBlameByRange(
blame: BlameInfo,
start: number,
end: number
): void;
/**
* Finds the next DIV.contentText element following the given element, and on
* the same side. Will only search within a group.
*
* TODO: Change `null` to `undefined`.
*/
protected abstract getNextContentOnSide(
content: HTMLElement,
side: Side
): HTMLElement | null;
/**
* Gets configuration for creating move controls for chunks marked with
* dueToMove
*/
protected abstract getMoveControlsConfig(): {
numberOfCells: number;
movedOutIndex: number;
movedInIndex: number;
lineNumberCols: number[];
signCols?: {left: number; right: number};
};
/**
* Set the blame information for the diff. For any already-rendered line,
* re-render its blame cell content.
*/
setBlame(blame: BlameInfo[]) {
this.blameInfo = blame;
for (const commit of blame) {
for (const range of commit.ranges) {
this.renderBlameByRange(commit, range.start, range.end);
}
}
}
/**
* 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.
*/
// visible for testing
getBlameCommitForBaseLine(lineNum: LineNumber): BlameInfo | undefined {
for (const blameCommit of this.blameInfo) {
for (const range of blameCommit.ranges) {
if (range.start <= lineNum && range.end >= lineNum) {
return blameCommit;
}
}
}
return undefined;
}
/**
* Only special builders need to implement this. The default is to
* just ignore it.
*/
updateRenderPrefs(_: RenderPreferences) {}
}