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import * as vscode from 'vscode';
import { assert } from './util';
export async function applySnippetWorkspaceEdit(edit: vscode.WorkspaceEdit) {
if (edit.entries().length === 1) {
const [uri, edits] = edit.entries()[0];
const editor = await editorFromUri(uri);
if (editor) await applySnippetTextEdits(editor, edits);
return;
}
for (const [uri, edits] of edit.entries()) {
const editor = await editorFromUri(uri);
if (editor) await editor.edit((builder) => {
for (const indel of edits) {
assert(!parseSnippet(indel.newText), `bad ws edit: snippet received with multiple edits: ${JSON.stringify(edit)}`);
builder.replace(indel.range, indel.newText);
}
});
}
}
async function editorFromUri(uri: vscode.Uri): Promise<vscode.TextEditor | undefined> {
if (vscode.window.activeTextEditor?.document.uri !== uri) {
// `vscode.window.visibleTextEditors` only contains editors whose contents are being displayed
await vscode.window.showTextDocument(uri, {});
}
return vscode.window.visibleTextEditors.find((it) => it.document.uri.toString() === uri.toString());
}
export async function applySnippetTextEdits(editor: vscode.TextEditor, edits: vscode.TextEdit[]) {
const selections: vscode.Selection[] = [];
let lineDelta = 0;
await editor.edit((builder) => {
for (const indel of edits) {
const parsed = parseSnippet(indel.newText);
if (parsed) {
const [newText, [placeholderStart, placeholderLength]] = parsed;
const prefix = newText.substr(0, placeholderStart);
const lastNewline = prefix.lastIndexOf('\n');
const startLine = indel.range.start.line + lineDelta + countLines(prefix);
const startColumn = lastNewline === -1 ?
indel.range.start.character + placeholderStart
: prefix.length - lastNewline - 1;
const endColumn = startColumn + placeholderLength;
selections.push(new vscode.Selection(
new vscode.Position(startLine, startColumn),
new vscode.Position(startLine, endColumn),
));
builder.replace(indel.range, newText);
} else {
builder.replace(indel.range, indel.newText);
}
lineDelta = countLines(indel.newText) - (indel.range.end.line - indel.range.start.line);
}
});
if (selections.length > 0) editor.selections = selections;
}
function parseSnippet(snip: string): [string, [number, number]] | undefined {
const m = snip.match(/\$(0|\{0:([^}]*)\})/);
if (!m) return undefined;
const placeholder = m[2] ?? "";
if (m.index == null)
return undefined;
const range: [number, number] = [m.index, placeholder.length];
const insert = snip.replace(m[0], placeholder);
return [insert, range];
}
function countLines(text: string): number {
return (text.match(/\n/g) || []).length;
}
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