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snippetCompletionProvider.ts
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snippetCompletionProvider.ts
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/*---------------------------------------------------------------------------------------------
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See License.txt in the project root for license information.
*--------------------------------------------------------------------------------------------*/
import { MarkdownString } from 'vs/base/common/htmlContent';
import { compare, compareSubstring } from 'vs/base/common/strings';
import { Position } from 'vs/editor/common/core/position';
import { IRange, Range } from 'vs/editor/common/core/range';
import { ITextModel } from 'vs/editor/common/model';
import { CompletionItem, CompletionItemKind, CompletionItemProvider, CompletionList, LanguageId, CompletionItemInsertTextRule, CompletionContext, CompletionTriggerKind, CompletionItemLabel } from 'vs/editor/common/modes';
import { IModeService } from 'vs/editor/common/services/modeService';
import { SnippetParser } from 'vs/editor/contrib/snippet/snippetParser';
import { localize } from 'vs/nls';
import { ISnippetsService } from 'vs/workbench/contrib/snippets/browser/snippets.contribution';
import { Snippet, SnippetSource } from 'vs/workbench/contrib/snippets/browser/snippetsFile';
import { isPatternInWord } from 'vs/base/common/filters';
import { StopWatch } from 'vs/base/common/stopwatch';
import { LanguageConfigurationRegistry } from 'vs/editor/common/modes/languageConfigurationRegistry';
export class SnippetCompletion implements CompletionItem {
label: CompletionItemLabel;
detail: string;
insertText: string;
documentation?: MarkdownString;
range: IRange | { insert: IRange, replace: IRange };
sortText: string;
kind: CompletionItemKind;
insertTextRules: CompletionItemInsertTextRule;
constructor(
readonly snippet: Snippet,
range: IRange | { insert: IRange, replace: IRange }
) {
this.label = { label: snippet.prefix, description: snippet.name };
this.detail = localize('detail.snippet', "{0} ({1})", snippet.description || snippet.name, snippet.source);
this.insertText = snippet.codeSnippet;
this.range = range;
this.sortText = `${snippet.snippetSource === SnippetSource.Extension ? 'z' : 'a'}-${snippet.prefix}`;
this.kind = CompletionItemKind.Snippet;
this.insertTextRules = CompletionItemInsertTextRule.InsertAsSnippet;
}
resolve(): this {
this.documentation = new MarkdownString().appendCodeblock('', new SnippetParser().text(this.snippet.codeSnippet));
return this;
}
static compareByLabel(a: SnippetCompletion, b: SnippetCompletion): number {
return compare(a.label.label, b.label.label);
}
}
export class SnippetCompletionProvider implements CompletionItemProvider {
readonly _debugDisplayName = 'snippetCompletions';
constructor(
@IModeService private readonly _modeService: IModeService,
@ISnippetsService private readonly _snippets: ISnippetsService
) {
//
}
async provideCompletionItems(model: ITextModel, position: Position, context: CompletionContext): Promise<CompletionList> {
if (context.triggerKind === CompletionTriggerKind.TriggerCharacter && context.triggerCharacter?.match(/\s/)) {
// no snippets when suggestions have been triggered by space
return { suggestions: [] };
}
const sw = new StopWatch(true);
const languageId = this._getLanguageIdAtPosition(model, position);
const snippets = await this._snippets.getSnippets(languageId);
let pos = { lineNumber: position.lineNumber, column: 1 };
let lineOffsets: number[] = [];
const lineContent = model.getLineContent(position.lineNumber).toLowerCase();
const endsInWhitespace = /\s/.test(lineContent[position.column - 2]);
while (pos.column < position.column) {
let word = model.getWordAtPosition(pos);
if (word) {
// at a word
lineOffsets.push(word.startColumn - 1);
pos.column = word.endColumn + 1;
if (word.endColumn < position.column && !/\s/.test(lineContent[word.endColumn - 1])) {
lineOffsets.push(word.endColumn - 1);
}
}
else if (!/\s/.test(lineContent[pos.column - 1])) {
// at a none-whitespace character
lineOffsets.push(pos.column - 1);
pos.column += 1;
}
else {
// always advance!
pos.column += 1;
}
}
const availableSnippets = new Set<Snippet>(snippets);
const suggestions: SnippetCompletion[] = [];
const columnOffset = position.column - 1;
for (const start of lineOffsets) {
availableSnippets.forEach(snippet => {
if (isPatternInWord(lineContent, start, columnOffset, snippet.prefixLow, 0, snippet.prefixLow.length)) {
const prefixPos = position.column - (1 + start);
const prefixRestLen = snippet.prefixLow.length - prefixPos;
const endsWithPrefixRest = compareSubstring(lineContent, snippet.prefixLow, columnOffset, (columnOffset) + prefixRestLen, prefixPos, prefixPos + prefixRestLen);
const startPosition = position.delta(0, -prefixPos);
let endColumn = endsWithPrefixRest === 0 ? position.column + prefixRestLen : position.column;
// First check if there is anything to the right of the cursor
if (columnOffset < lineContent.length) {
const autoClosingPairs = LanguageConfigurationRegistry.getAutoClosingPairs(languageId);
const standardAutoClosingPairConditionals = autoClosingPairs.autoClosingPairsCloseSingleChar.get(lineContent[columnOffset]);
// If the character to the right of the cursor is a closing character of an autoclosing pair
if (standardAutoClosingPairConditionals?.some(p =>
// and the start position is the opening character of an autoclosing pair
p.open === lineContent[startPosition.column - 1] &&
// and the snippet prefix contains the opening and closing pair at its edges
snippet.prefix.startsWith(p.open) &&
snippet.prefix[snippet.prefix.length - 1] === p.close)) {
// Eat the character that was likely inserted because of auto-closing pairs
endColumn++;
}
}
const replace = Range.fromPositions(startPosition, { lineNumber: position.lineNumber, column: endColumn });
const insert = replace.setEndPosition(position.lineNumber, position.column);
suggestions.push(new SnippetCompletion(snippet, { replace, insert }));
availableSnippets.delete(snippet);
}
});
}
if (endsInWhitespace || lineOffsets.length === 0) {
// add remaing snippets when the current prefix ends in whitespace or when no
// interesting positions have been found
availableSnippets.forEach(snippet => {
const insert = Range.fromPositions(position);
const replace = lineContent.indexOf(snippet.prefixLow, columnOffset) === columnOffset ? insert.setEndPosition(position.lineNumber, position.column + snippet.prefixLow.length) : insert;
suggestions.push(new SnippetCompletion(snippet, { replace, insert }));
});
}
// dismbiguate suggestions with same labels
suggestions.sort(SnippetCompletion.compareByLabel);
for (let i = 0; i < suggestions.length; i++) {
let item = suggestions[i];
let to = i + 1;
for (; to < suggestions.length && item.label === suggestions[to].label; to++) {
suggestions[to].label.label = localize('snippetSuggest.longLabel', "{0}, {1}", suggestions[to].label.label, suggestions[to].snippet.name);
}
if (to > i + 1) {
suggestions[i].label.label = localize('snippetSuggest.longLabel', "{0}, {1}", suggestions[i].label.label, suggestions[i].snippet.name);
i = to;
}
}
return {
suggestions,
duration: sw.elapsed()
};
}
resolveCompletionItem(item: CompletionItem): CompletionItem {
return (item instanceof SnippetCompletion) ? item.resolve() : item;
}
private _getLanguageIdAtPosition(model: ITextModel, position: Position): LanguageId {
// validate the `languageId` to ensure this is a user
// facing language with a name and the chance to have
// snippets, else fall back to the outer language
model.tokenizeIfCheap(position.lineNumber);
let languageId = model.getLanguageIdAtPosition(position.lineNumber, position.column);
const languageIdentifier = this._modeService.getLanguageIdentifier(languageId);
if (languageIdentifier && !this._modeService.getLanguageName(languageIdentifier.language)) {
languageId = model.getLanguageIdentifier().id;
}
return languageId;
}
}