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/**
* @license
* Copyright 2021 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import '@polymer/paper-button/paper-button';
import '@polymer/paper-card/paper-card';
import '@polymer/paper-checkbox/paper-checkbox';
import '@polymer/paper-dropdown-menu/paper-dropdown-menu';
import '@polymer/paper-fab/paper-fab';
import '@polymer/paper-icon-button/paper-icon-button';
import '@polymer/paper-item/paper-item';
import '@polymer/paper-listbox/paper-listbox';
import '@polymer/paper-tooltip/paper-tooltip';
import {of, EMPTY, Subject} from 'rxjs';
import {switchMap, delay} from 'rxjs/operators';
import '../../../elements/shared/gr-button/gr-button';
import {pluralize} from '../../../utils/string-util';
import {fire} from '../../../utils/event-util';
import {DiffInfo} from '../../../types/diff';
import {assertIsDefined} from '../../../utils/common-util';
import {css, html, LitElement, TemplateResult} from 'lit';
import {customElement, property} from 'lit/decorators.js';
import {subscribe} from '../../../elements/lit/subscription-controller';
import {
ContextButtonType,
DiffContextButtonHoveredDetail,
RenderPreferences,
SyntaxBlock,
} from '../../../api/diff';
import {GrDiffGroup, hideInContextControl} from '../gr-diff/gr-diff-group';
declare global {
interface HTMLElementEventMap {
'diff-context-button-hovered': CustomEvent<DiffContextButtonHoveredDetail>;
}
}
const PARTIAL_CONTEXT_AMOUNT = 10;
/**
* Traverses a hierarchical structure of syntax blocks and
* finds the most local/nested block that can be associated line.
* It finds the closest block that contains the whole line and
* returns the whole path from the syntax layer (blocks) sent as parameter
* to the most nested block - the complete path from the top to bottom layer of
* a syntax tree. Example: [myNamespace, MyClass, myMethod1, aLocalFunctionInsideMethod1]
*
* @param lineNum line number for the targeted line.
* @param blocks Blocks for a specific syntax level in the file (to allow recursive calls)
*/
function findBlockTreePathForLine(
lineNum: number,
blocks?: SyntaxBlock[]
): SyntaxBlock[] {
const containingBlock = blocks?.find(
({range}) => range.start_line < lineNum && range.end_line > lineNum
);
if (!containingBlock) return [];
const innerPathInChild = findBlockTreePathForLine(
lineNum,
containingBlock?.children
);
return [containingBlock].concat(innerPathInChild);
}
export type GrContextControlsShowConfig = 'above' | 'below' | 'both';
export function getShowConfig(
showAbove: boolean,
showBelow: boolean
): GrContextControlsShowConfig {
if (showAbove && !showBelow) return 'above';
if (!showAbove && showBelow) return 'below';
// Note that !showAbove && !showBelow also intentionally returns 'both'.
// This means the file is completely collapsed, which is unusual, but at least
// happens in one test.
return 'both';
}
@customElement('gr-context-controls')
export class GrContextControls extends LitElement {
@property({type: Object}) renderPreferences?: RenderPreferences;
@property({type: Object}) diff?: DiffInfo;
@property({type: Object}) group?: GrDiffGroup;
@property({type: String, reflect: true})
showConfig: GrContextControlsShowConfig = 'both';
private expandButtonsHover = new Subject<{
eventType: 'enter' | 'leave';
buttonType: ContextButtonType;
linesToExpand: number;
}>();
static override styles = css`
:host {
display: flex;
justify-content: center;
flex-direction: column;
position: relative;
}
:host([showConfig='above']) {
justify-content: flex-end;
margin-top: calc(-1px - var(--line-height-normal) - var(--spacing-s));
margin-bottom: var(--gr-context-controls-margin-bottom);
height: calc(var(--line-height-normal) + var(--spacing-s));
.horizontalFlex {
align-items: end;
}
}
:host([showConfig='below']) {
justify-content: flex-start;
margin-top: 1px;
margin-bottom: calc(0px - var(--line-height-normal) - var(--spacing-s));
.horizontalFlex {
align-items: start;
}
}
:host([showConfig='both']) {
margin-top: calc(0px - var(--line-height-normal) - var(--spacing-s));
margin-bottom: calc(0px - var(--line-height-normal) - var(--spacing-s));
height: calc(
2 * var(--line-height-normal) + 2 * var(--spacing-s) +
var(--divider-height)
);
.horizontalFlex {
align-items: center;
}
}
.contextControlButton {
background-color: var(--default-button-background-color);
font: var(--context-control-button-font, inherit);
}
paper-button {
text-transform: none;
align-items: center;
background-color: var(--background-color);
font-family: inherit;
margin: var(--margin, 0);
min-width: var(--border, 0);
color: var(--diff-context-control-color);
border: solid var(--border-color);
border-width: 1px;
border-radius: var(--border-radius);
padding: var(--spacing-s) var(--spacing-l);
}
paper-button:hover {
/* same as defined in gr-button */
background: rgba(0, 0, 0, 0.12);
}
.aboveBelowButtons {
display: flex;
flex-direction: column;
justify-content: center;
margin-left: var(--spacing-m);
position: relative;
}
.aboveBelowButtons:first-child {
margin-left: 0;
/* Places a default background layer behind the "all button" that can have opacity */
background-color: var(--default-button-background-color);
}
.horizontalFlex {
display: flex;
justify-content: center;
align-items: var(--gr-context-controls-horizontal-align-items, center);
}
.aboveButton {
border-bottom-width: 0;
border-bottom-right-radius: 0;
border-bottom-left-radius: 0;
padding: var(--spacing-xxs) var(--spacing-l);
}
.belowButton {
border-top-width: 0;
border-top-left-radius: 0;
border-top-right-radius: 0;
padding: var(--spacing-xxs) var(--spacing-l);
margin-top: calc(var(--divider-height) + 2 * var(--spacing-xxs));
}
.belowButton:first-child {
margin-top: 0;
}
.breadcrumbTooltip {
white-space: nowrap;
}
`;
constructor() {
super();
this.setupButtonHoverHandler();
}
private showBoth() {
return this.showConfig === 'both';
}
private showAbove() {
return this.showBoth() || this.showConfig === 'above';
}
private showBelow() {
return this.showBoth() || this.showConfig === 'below';
}
private setupButtonHoverHandler() {
subscribe(
this,
() =>
this.expandButtonsHover.pipe(
switchMap(e => {
if (e.eventType === 'leave') {
// cancel any previous delay
// for mouse enter
return EMPTY;
}
return of(e).pipe(delay(500));
})
),
({buttonType, linesToExpand}) => {
fire(this, 'diff-context-button-hovered', {
buttonType,
linesToExpand,
});
}
);
}
private numLines() {
assertIsDefined(this.group);
// In context groups, there is the same number of lines left and right
const left = this.group.lineRange.left;
// Both start and end inclusive, so we need to add 1.
return left.end_line - left.start_line + 1;
}
private createExpandAllButtonContainer() {
return html` <div class="gr-diff aboveBelowButtons fullExpansion">
${this.createContextButton(ContextButtonType.ALL, this.numLines())}
</div>`;
}
/**
* Creates a specific expansion button (e.g. +X common lines, +10, +Block).
*/
private createContextButton(
type: ContextButtonType,
linesToExpand: number,
tooltip?: TemplateResult
) {
if (!this.group) return;
let text = '';
let groups: GrDiffGroup[] = []; // The groups that replace this one if tapped.
let ariaLabel = '';
let classes = 'contextControlButton showContext ';
if (type === ContextButtonType.ALL) {
text = `+${pluralize(linesToExpand, 'common line')}`;
ariaLabel = `Show ${pluralize(linesToExpand, 'common line')}`;
classes += this.showBoth()
? 'centeredButton'
: this.showAbove()
? 'aboveButton'
: 'belowButton';
if (this.group?.hasSkipGroup()) {
// Expanding content would require load of more data
text += ' (too large)';
}
groups.push(...this.group.contextGroups);
} else if (type === ContextButtonType.ABOVE) {
groups = hideInContextControl(
this.group.contextGroups,
linesToExpand,
this.numLines()
);
text = `+${linesToExpand}`;
classes += 'aboveButton';
ariaLabel = `Show ${pluralize(linesToExpand, 'line')} above`;
} else if (type === ContextButtonType.BELOW) {
groups = hideInContextControl(
this.group.contextGroups,
0,
this.numLines() - linesToExpand
);
text = `+${linesToExpand}`;
classes += 'belowButton';
ariaLabel = `Show ${pluralize(linesToExpand, 'line')} below`;
} else if (type === ContextButtonType.BLOCK_ABOVE) {
groups = hideInContextControl(
this.group.contextGroups,
linesToExpand,
this.numLines()
);
text = '+Block';
classes += 'aboveButton';
ariaLabel = 'Show block above';
} else if (type === ContextButtonType.BLOCK_BELOW) {
groups = hideInContextControl(
this.group.contextGroups,
0,
this.numLines() - linesToExpand
);
text = '+Block';
classes += 'belowButton';
ariaLabel = 'Show block below';
}
const expandHandler = this.createExpansionHandler(
linesToExpand,
type,
groups
);
const mouseHandler = (eventType: 'enter' | 'leave') => {
this.expandButtonsHover.next({
eventType,
buttonType: type,
linesToExpand,
});
};
const button = html` <paper-button
class=${classes}
aria-label=${ariaLabel}
@click=${expandHandler}
@mouseenter=${() => mouseHandler('enter')}
@mouseleave=${() => mouseHandler('leave')}
>
<span class="showContext">${text}</span>
${tooltip}
</paper-button>`;
return button;
}
private createExpansionHandler(
linesToExpand: number,
type: ContextButtonType,
groups: GrDiffGroup[]
) {
return (e: Event) => {
assertIsDefined(this.group);
e.stopPropagation();
if (type === ContextButtonType.ALL && this.group?.hasSkipGroup()) {
fire(this, 'content-load-needed', {
lineRange: this.group.lineRange,
});
} else {
fire(this, 'diff-context-expanded', {
contextGroup: this.group,
groups,
numLines: this.numLines(),
buttonType: type,
expandedLines: linesToExpand,
});
}
};
}
private showPartialLinks() {
return this.numLines() > PARTIAL_CONTEXT_AMOUNT;
}
/**
* Creates a container div with partial (+10) expansion buttons (above and/or below).
*/
private createPartialExpansionButtons() {
if (!this.showPartialLinks()) {
return undefined;
}
let aboveButton;
let belowButton;
if (this.showAbove()) {
aboveButton = this.createContextButton(
ContextButtonType.ABOVE,
PARTIAL_CONTEXT_AMOUNT
);
}
if (this.showBelow()) {
belowButton = this.createContextButton(
ContextButtonType.BELOW,
PARTIAL_CONTEXT_AMOUNT
);
}
return aboveButton || belowButton
? html` <div class="aboveBelowButtons partialExpansion">
${aboveButton} ${belowButton}
</div>`
: undefined;
}
/**
* Creates a container div with block expansion buttons (above and/or below).
*/
private createBlockExpansionButtons() {
assertIsDefined(this.group, 'group');
if (
!this.showPartialLinks() ||
!this.renderPreferences?.use_block_expansion ||
this.group?.hasSkipGroup()
) {
return undefined;
}
let aboveBlockButton;
let belowBlockButton;
if (this.showAbove()) {
aboveBlockButton = this.createBlockButton(
ContextButtonType.BLOCK_ABOVE,
this.numLines(),
this.group.lineRange.right.start_line - 1
);
}
if (this.showBelow()) {
belowBlockButton = this.createBlockButton(
ContextButtonType.BLOCK_BELOW,
this.numLines(),
this.group.lineRange.right.end_line + 1
);
}
if (aboveBlockButton || belowBlockButton) {
return html` <div class="aboveBelowButtons blockExpansion">
${aboveBlockButton} ${belowBlockButton}
</div>`;
}
return undefined;
}
private createBlockButtonTooltip(
buttonType: ContextButtonType,
syntaxPath: SyntaxBlock[],
linesToExpand: number
) {
// Create breadcrumb string:
// myNamespace > MyClass > myMethod1 > aLocalFunctionInsideMethod1 > (anonymous)
const tooltipText = syntaxPath.length
? syntaxPath.map(b => b.name || '(anonymous)').join(' > ')
: `${linesToExpand} common lines`;
const position =
buttonType === ContextButtonType.BLOCK_ABOVE ? 'top' : 'bottom';
return html`<paper-tooltip offset="10" position=${position}
><div class="breadcrumbTooltip">${tooltipText}</div></paper-tooltip
>`;
}
private createBlockButton(
buttonType: ContextButtonType,
numLines: number,
referenceLine: number
) {
if (!this.diff?.meta_b) return;
const syntaxTree = this.diff.meta_b.syntax_tree;
const outlineSyntaxPath = findBlockTreePathForLine(
referenceLine,
syntaxTree
);
let linesToExpand = numLines;
if (outlineSyntaxPath.length) {
const {range} = outlineSyntaxPath[outlineSyntaxPath.length - 1];
const targetLine =
buttonType === ContextButtonType.BLOCK_ABOVE
? range.end_line
: range.start_line;
const distanceToTargetLine = Math.abs(targetLine - referenceLine);
if (distanceToTargetLine < numLines) {
linesToExpand = distanceToTargetLine;
}
}
const tooltip = this.createBlockButtonTooltip(
buttonType,
outlineSyntaxPath,
linesToExpand
);
return this.createContextButton(buttonType, linesToExpand, tooltip);
}
private hasValidProperties() {
return !!(this.diff && this.group?.contextGroups?.length);
}
override render() {
if (!this.hasValidProperties()) {
console.error('Invalid properties for gr-context-controls!');
return html`<p>invalid properties</p>`;
}
return html`
<div class="horizontalFlex">
${this.createExpandAllButtonContainer()}
${this.createPartialExpansionButtons()}
${this.createBlockExpansionButtons()}
</div>
`;
}
}
declare global {
interface HTMLElementTagNameMap {
'gr-context-controls': GrContextControls;
}
}