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fix: Support multiple tab stops in completions in VSCode

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Uses the native VSCode support for `SnippetTextEdit`s, but in a semi-hacky way as it's not fully supported yet.
This commit is contained in:
DropDemBits 2024-02-01 20:38:42 -05:00
parent b9b0d29b8e
commit d846586bc9
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2 changed files with 99 additions and 56 deletions
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89
editors/code/src/snippets.ts
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@ -3,20 +3,28 @@ import * as vscode from "vscode";
import { assert } from "./util";
import { unwrapUndefinable } from "./undefinable";
export async function applySnippetWorkspaceEdit(edit: vscode.WorkspaceEdit) {
if (edit.entries().length === 1) {
const [uri, edits] = unwrapUndefinable(edit.entries()[0]);
export type SnippetTextDocumentEdit = [vscode.Uri, (vscode.TextEdit | vscode.SnippetTextEdit)[]];
export async function applySnippetWorkspaceEdit(
edit: vscode.WorkspaceEdit,
editEntries: SnippetTextDocumentEdit[],
) {
if (editEntries.length === 1) {
const [uri, edits] = unwrapUndefinable(editEntries[0]);
const editor = await editorFromUri(uri);
if (editor) await applySnippetTextEdits(editor, edits);
if (editor) {
edit.set(uri, edits);
await vscode.workspace.applyEdit(edit);
}
return;
}
for (const [uri, edits] of edit.entries()) {
for (const [uri, edits] of editEntries) {
const editor = await editorFromUri(uri);
if (editor) {
await editor.edit((builder) => {
for (const indel of edits) {
assert(
!parseSnippet(indel.newText),
!(indel instanceof vscode.SnippetTextEdit),
`bad ws edit: snippet received with multiple edits: ${JSON.stringify(
edit,
)}`,
@ -39,53 +47,30 @@ async function editorFromUri(uri: vscode.Uri): Promise<vscode.TextEditor | undef
}
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 edit = new vscode.WorkspaceEdit();
edit.set(editor.document.uri, toSnippetTextEdits(edits));
await vscode.workspace.applyEdit(edit);
}
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);
function hasSnippet(snip: string): boolean {
const m = snip.match(/\$\d+|\{\d+:[^}]*\}/);
return m != null;
}
function toSnippetTextEdits(
edits: vscode.TextEdit[],
): (vscode.TextEdit | vscode.SnippetTextEdit)[] {
return edits.map((textEdit) => {
// Note: text edits without any snippets are returned as-is instead of
// being wrapped in a SnippetTextEdit, as otherwise it would be
// treated as if it had a tab stop at the end.
if (hasSnippet(textEdit.newText)) {
return new vscode.SnippetTextEdit(
textEdit.range,
new vscode.SnippetString(textEdit.newText),
);
} else {
return textEdit;
}
});
if (selections.length > 0) editor.selections = selections;
if (selections.length === 1) {
const selection = unwrapUndefinable(selections[0]);
editor.revealRange(selection, vscode.TextEditorRevealType.InCenterIfOutsideViewport);
}
}
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;
}