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import seedrandom = require('seedrandom');
import * as vscode from 'vscode';
import * as lc from 'vscode-languageclient';
import { Server } from './server';
export interface Decoration {
range: lc.Range;
tag: string;
bindingHash?: string;
}
// Based on this HSL-based color generator: https://gist.github.com/bendc/76c48ce53299e6078a76
function fancify(seed: string, shade: 'light' | 'dark') {
const random = seedrandom(seed);
const randomInt = (min: number, max: number) => {
return Math.floor(random() * (max - min + 1)) + min;
};
const h = randomInt(0, 360);
const s = randomInt(42, 98);
const l = shade === 'light' ? randomInt(15, 40) : randomInt(40, 90);
return `hsl(${h},${s}%,${l}%)`;
}
export class Highlighter {
private static initDecorations(): Map<
string,
vscode.TextEditorDecorationType
> {
const decoration = (
tag: string,
textDecoration?: string
): [string, vscode.TextEditorDecorationType] => {
const color = new vscode.ThemeColor('ralsp.' + tag);
const decor = vscode.window.createTextEditorDecorationType({
color,
textDecoration
});
return [tag, decor];
};
const decorations: Iterable<
[string, vscode.TextEditorDecorationType]
> = [
decoration('comment'),
decoration('string'),
decoration('keyword'),
decoration('keyword.control'),
decoration('keyword.unsafe'),
decoration('function'),
decoration('parameter'),
decoration('constant'),
decoration('type'),
decoration('builtin'),
decoration('text'),
decoration('attribute'),
decoration('literal'),
decoration('macro'),
decoration('variable'),
decoration('variable.mut', 'underline'),
decoration('field'),
decoration('module')
];
return new Map<string, vscode.TextEditorDecorationType>(decorations);
}
private decorations: Map<
string,
vscode.TextEditorDecorationType
> | null = null;
public removeHighlights() {
if (this.decorations == null) {
return;
}
// Decorations are removed when the object is disposed
for (const decoration of this.decorations.values()) {
decoration.dispose();
}
this.decorations = null;
}
public setHighlights(editor: vscode.TextEditor, highlights: Decoration[]) {
// Initialize decorations if necessary
//
// Note: decoration objects need to be kept around so we can dispose them
// if the user disables syntax highlighting
if (this.decorations == null) {
this.decorations = Highlighter.initDecorations();
}
const byTag: Map<string, vscode.Range[]> = new Map();
const colorfulIdents: Map<
string,
[vscode.Range[], boolean]
> = new Map();
const rainbowTime = Server.config.rainbowHighlightingOn;
for (const tag of this.decorations.keys()) {
byTag.set(tag, []);
}
for (const d of highlights) {
if (!byTag.get(d.tag)) {
continue;
}
if (rainbowTime && d.bindingHash) {
if (!colorfulIdents.has(d.bindingHash)) {
const mut = d.tag.endsWith('.mut');
colorfulIdents.set(d.bindingHash, [[], mut]);
}
colorfulIdents
.get(d.bindingHash)![0]
.push(
Server.client.protocol2CodeConverter.asRange(d.range)
);
} else {
byTag
.get(d.tag)!
.push(
Server.client.protocol2CodeConverter.asRange(d.range)
);
}
}
for (const tag of byTag.keys()) {
const dec = this.decorations.get(
tag
) as vscode.TextEditorDecorationType;
const ranges = byTag.get(tag)!;
editor.setDecorations(dec, ranges);
}
for (const [hash, [ranges, mut]] of colorfulIdents.entries()) {
const textDecoration = mut ? 'underline' : undefined;
const dec = vscode.window.createTextEditorDecorationType({
light: { color: fancify(hash, 'light'), textDecoration },
dark: { color: fancify(hash, 'dark'), textDecoration }
});
editor.setDecorations(dec, ranges);
}
}
}
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