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/**
* @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 '../../../scripts/bundled-polymer.js';
import '../gr-diff-highlight/gr-annotation.js';
import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners.js';
import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin.js';
import {PolymerElement} from '@polymer/polymer/polymer-element.js';
import {htmlTemplate} from './gr-ranged-comment-layer_html.js';
// Polymer 1 adds # before array's key, while Polymer 2 doesn't
const HOVER_PATH_PATTERN = /^(commentRanges\.\#?\d+)\.hovering$/;
const RANGE_HIGHLIGHT = 'style-scope gr-diff range';
const HOVER_HIGHLIGHT = 'style-scope gr-diff rangeHighlight';
/** @extends Polymer.Element */
class GrRangedCommentLayer extends GestureEventListeners(
LegacyElementMixin(
PolymerElement)) {
static get template() { return htmlTemplate; }
static get is() { return 'gr-ranged-comment-layer'; }
/**
* Fired when the range in a range comment was malformed and had to be
* normalized.
*
* It's `detail` has a `lineNum` and `side` parameter.
*
* @event normalize-range
*/
static get properties() {
return {
/** @type {!Array<!Gerrit.HoveredRange>} */
commentRanges: Array,
_listeners: {
type: Array,
value() { return []; },
},
_rangesMap: {
type: Object,
value() { return {left: {}, right: {}}; },
},
};
}
static get observers() {
return [
'_handleCommentRangesChange(commentRanges.*)',
];
}
get styleModuleName() {
return 'gr-ranged-comment-styles';
}
/**
* Layer method to add annotations to a line.
*
* @param {!HTMLElement} el The DIV.contentText element to apply the
* annotation to.
* @param {!HTMLElement} lineNumberEl
* @param {!Object} line The line object. (GrDiffLine)
*/
annotate(el, lineNumberEl, line) {
let ranges = [];
if (line.type === GrDiffLine.Type.REMOVE || (
line.type === GrDiffLine.Type.BOTH &&
el.getAttribute('data-side') !== 'right')) {
ranges = ranges.concat(this._getRangesForLine(line, 'left'));
}
if (line.type === GrDiffLine.Type.ADD || (
line.type === GrDiffLine.Type.BOTH &&
el.getAttribute('data-side') !== 'left')) {
ranges = ranges.concat(this._getRangesForLine(line, 'right'));
}
for (const range of ranges) {
GrAnnotation.annotateElement(el, range.start,
range.end - range.start,
range.hovering ? HOVER_HIGHLIGHT : RANGE_HIGHLIGHT);
}
}
/**
* Register a listener for layer updates.
*
* @param {function(number, number, string)} fn The update handler function.
* Should accept as arguments the line numbers for the start and end of
* the update and the side as a string.
*/
addListener(fn) {
this._listeners.push(fn);
}
/**
* Notify Layer listeners of changes to annotations.
*
* @param {number} start The line where the update starts.
* @param {number} end The line where the update ends.
* @param {string} side The side of the update. ('left' or 'right')
*/
_notifyUpdateRange(start, end, side) {
for (const listener of this._listeners) {
listener(start, end, side);
}
}
/**
* Handle change in the ranges by updating the ranges maps and by
* emitting appropriate update notifications.
*
* @param {Object} record The change record.
*/
_handleCommentRangesChange(record) {
if (!record) return;
// If the entire set of comments was changed.
if (record.path === 'commentRanges') {
this._rangesMap = {left: {}, right: {}};
for (const {side, range, hovering} of record.value) {
this._updateRangesMap(
side, range, hovering, (forLine, start, end, hovering) => {
forLine.push({start, end, hovering});
});
}
}
// If the change only changed the `hovering` property of a comment.
const match = record.path.match(HOVER_PATH_PATTERN);
if (match) {
// The #number indicates the key of that item in the array
// not the index, especially in polymer 1.
const {side, range, hovering} = this.get(match[1]);
this._updateRangesMap(
side, range, hovering, (forLine, start, end, hovering) => {
const index = forLine.findIndex(lineRange =>
lineRange.start === start && lineRange.end === end);
forLine[index].hovering = hovering;
});
}
// If comments were spliced in or out.
if (record.path === 'commentRanges.splices') {
for (const indexSplice of record.value.indexSplices) {
const removed = indexSplice.removed;
for (const {side, range, hovering} of removed) {
this._updateRangesMap(
side, range, hovering, (forLine, start, end) => {
const index = forLine.findIndex(lineRange =>
lineRange.start === start && lineRange.end === end);
forLine.splice(index, 1);
});
}
const added = indexSplice.object.slice(
indexSplice.index, indexSplice.index + indexSplice.addedCount);
for (const {side, range, hovering} of added) {
this._updateRangesMap(
side, range, hovering, (forLine, start, end, hovering) => {
forLine.push({start, end, hovering});
});
}
}
}
}
_updateRangesMap(side, range, hovering, operation) {
const forSide = this._rangesMap[side] || (this._rangesMap[side] = {});
for (let line = range.start_line; line <= range.end_line; line++) {
const forLine = forSide[line] || (forSide[line] = []);
const start = line === range.start_line ? range.start_character : 0;
const end = line === range.end_line ? range.end_character : -1;
operation(forLine, start, end, hovering);
}
this._notifyUpdateRange(range.start_line, range.end_line, side);
}
_getRangesForLine(line, side) {
const lineNum = side === 'left' ? line.beforeNumber : line.afterNumber;
const ranges = this.get(['_rangesMap', side, lineNum]) || [];
return ranges
.map(range => {
// Make a copy, so that the normalization below does not mess with
// our map.
range = Object.assign({}, range);
range.end = range.end === -1 ? line.text.length : range.end;
// Normalize invalid ranges where the start is after the end but the
// start still makes sense. Set the end to the end of the line.
// @see Issue 5744
if (range.start >= range.end && range.start < line.text.length) {
range.end = line.text.length;
this.dispatchEvent(new CustomEvent('normalize-range', {
bubbles: true,
composed: true,
detail: {lineNum, side},
}));
}
return range;
})
// Sort the ranges so that hovering highlights are on top.
.sort((a, b) => (a.hovering && !b.hovering ? 1 : 0));
}
}
customElements.define(GrRangedCommentLayer.is, GrRangedCommentLayer);