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extension.ts
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extension.ts
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import * as VS from 'vscode'
import * as Parser from 'tree-sitter'
// Be sure to declare the language in package.json and include a minimalist grammar.
const languages: {[id: string]: {parser: Parser, color: ColorFunction}} = {
'go': createParser('tree-sitter-go', colorGo),
'typescript': createParser('tree-sitter-typescript', colorTypescript),
'cpp': createParser('tree-sitter-cpp', colorCpp),
'rust': createParser('tree-sitter-rust', colorRust),
}
function colorGo(x: Parser.SyntaxNode, editor: VS.TextEditor) {
var types: VS.Range[] = []
var fields: VS.Range[] = []
var functions: VS.Range[] = []
function scan(x: Parser.SyntaxNode) {
if (!isVisible(x, editor)) return
if (x.type == 'identifier' && x.parent != null && x.parent.type == 'function_declaration') {
functions.push(range(x))
} else if (x.type == 'type_identifier') {
types.push(range(x))
} else if (x.type == 'field_identifier') {
fields.push(range(x))
}
for (let child of x.children) {
scan(child)
}
}
scan(x)
return {types, fields, functions}
}
function colorTypescript(x: Parser.SyntaxNode, editor: VS.TextEditor) {
var types: VS.Range[] = []
var fields: VS.Range[] = []
var functions: VS.Range[] = []
function scan(x: Parser.SyntaxNode) {
if (!isVisible(x, editor)) return
if (x.type == 'identifier' && x.parent != null && x.parent.type == 'function') {
functions.push(range(x))
} else if (x.type == 'type_identifier' || x.type == 'predefined_type') {
types.push(range(x))
} else if (x.type == 'property_identifier') {
fields.push(range(x))
}
for (let child of x.children) {
scan(child)
}
}
scan(x)
return {types, fields, functions}
}
function colorRust(x: Parser.SyntaxNode, editor: VS.TextEditor) {
var types: VS.Range[] = []
var fields: VS.Range[] = []
var functions: VS.Range[] = []
function scan(x: Parser.SyntaxNode) {
if (!isVisible(x, editor)) return
if (x.type == 'identifier' && x.parent != null && x.parent.type == 'function_item' && x.parent.parent != null && x.parent.parent.type == 'declaration_list') {
fields.push(range(x))
} else if (x.type == 'identifier' && x.parent != null && x.parent.type == 'function_item') {
functions.push(range(x))
} else if (x.type == 'identifier' && x.parent != null && x.parent.type == 'scoped_identifier' && x.parent.parent != null && x.parent.parent.type == 'function_declarator') {
functions.push(range(x))
} else if (x.type == 'type_identifier' || x.type == 'primitive_type') {
types.push(range(x))
} else if (x.type == 'field_identifier') {
fields.push(range(x))
}
for (let child of x.children) {
scan(child)
}
}
scan(x)
return {types, fields, functions}
}
function colorCpp(x: Parser.SyntaxNode, editor: VS.TextEditor) {
var types: VS.Range[] = []
var fields: VS.Range[] = []
var functions: VS.Range[] = []
function scan(x: Parser.SyntaxNode) {
if (!isVisible(x, editor)) return
if (x.type == 'identifier' && x.parent != null && x.parent.type == 'function_declarator') {
functions.push(range(x))
} else if (x.type == 'identifier' && x.parent != null && x.parent.type == 'scoped_identifier' && x.parent.parent != null && x.parent.parent.type == 'function_declarator') {
functions.push(range(x))
} else if (x.type == 'type_identifier') {
types.push(range(x))
} else if (x.type == 'field_identifier') {
fields.push(range(x))
}
for (let child of x.children) {
scan(child)
}
}
scan(x)
return {types, fields, functions}
}
function isVisible(x: Parser.SyntaxNode, editor: VS.TextEditor) {
for (let visible of editor.visibleRanges) {
const overlap = x.startPosition.row <= visible.end.line+1 && visible.start.line-1 <= x.endPosition.row
if (overlap) return true
}
return false
}
function range(x: Parser.SyntaxNode): VS.Range {
return new VS.Range(x.startPosition.row, x.startPosition.column, x.endPosition.row, x.endPosition.column)
}
type ColorFunction = (x: Parser.SyntaxNode, editor: VS.TextEditor) => {types: VS.Range[], fields: VS.Range[], functions: VS.Range[]}
function createParser(module: string, color: ColorFunction): {parser: Parser, color: ColorFunction} {
const lang = require(module)
const parser = new Parser()
parser.setLanguage(lang)
return {parser, color}
}
// Called when the extension is first activated by user opening a file with the appropriate language
export function activate(context: VS.ExtensionContext) {
console.log("Activating tree-sitter...")
// Parse of all visible documents
const trees: {[uri: string]: Parser.Tree} = {}
function open(editor: VS.TextEditor) {
const {parser} = languages[editor.document.languageId]
if (parser != null) {
const t = parser.parse(editor.document.getText()) // TODO don't use getText, use Parser.Input
trees[editor.document.uri.toString()] = t
colorUri(editor.document.uri)
}
}
function edit(edit: VS.TextDocumentChangeEvent) {
const {parser} = languages[edit.document.languageId]
if (parser != null) {
updateTree(parser, edit)
colorUri(edit.document.uri)
}
}
function updateTree(parser: Parser, edit: VS.TextDocumentChangeEvent) {
if (edit.contentChanges.length == 0) return
const old = trees[edit.document.uri.toString()]
const startIndex = Math.min(...edit.contentChanges.map(getStartIndex))
const oldEndIndex = Math.max(...edit.contentChanges.map(getOldEndIndex))
const newEndIndex = Math.max(...edit.contentChanges.map(getNewEndIndex))
const startPos = edit.document.positionAt(startIndex)
const oldEndPos = edit.document.positionAt(oldEndIndex)
const newEndPos = edit.document.positionAt(newEndIndex)
const startPosition = asPoint(startPos)
const oldEndPosition = asPoint(oldEndPos)
const newEndPosition = asPoint(newEndPos)
const delta = {startIndex, oldEndIndex, newEndIndex, startPosition, oldEndPosition, newEndPosition}
// console.log(edit.document.uri.toString(), delta)
old.edit(delta)
const t = parser.parse(edit.document.getText(), old) // TODO don't use getText, use Parser.Input
trees[edit.document.uri.toString()] = t
}
function getStartIndex(edit: VS.TextDocumentContentChangeEvent): number {
return edit.rangeOffset
}
function getOldEndIndex(edit: VS.TextDocumentContentChangeEvent): number {
return edit.rangeOffset + edit.rangeLength
}
function getNewEndIndex(edit: VS.TextDocumentContentChangeEvent): number {
return edit.rangeOffset + edit.text.length
}
function asPoint(pos: VS.Position): Parser.Point {
return {row: pos.line, column: pos.character}
}
function close(doc: VS.TextDocument) {
if (doc.languageId == 'go') {
delete trees[doc.uri.toString()]
}
}
// Apply themeable colors
const typeStyle = VS.window.createTextEditorDecorationType({
color: new VS.ThemeColor('treeSitter.type')
})
const fieldStyle = VS.window.createTextEditorDecorationType({
color: new VS.ThemeColor('treeSitter.field')
})
const functionStyle = VS.window.createTextEditorDecorationType({
color: new VS.ThemeColor('treeSitter.function')
})
function colorUri(uri: VS.Uri) {
for (let editor of VS.window.visibleTextEditors) {
if (editor.document.uri == uri) {
colorEditor(editor)
}
}
}
function colorEditor(editor: VS.TextEditor) {
const t = trees[editor.document.uri.toString()]
if (t == null) return;
const {color} = languages[editor.document.languageId]
if (color == null) return;
const {types, fields, functions} = color(t.rootNode, editor)
editor.setDecorations(typeStyle, types)
editor.setDecorations(fieldStyle, fields)
editor.setDecorations(functionStyle, functions)
// console.log(t.rootNode.toString())
}
VS.window.visibleTextEditors.forEach(open)
context.subscriptions.push(VS.window.onDidChangeVisibleTextEditors(editors => editors.forEach(open)))
context.subscriptions.push(VS.workspace.onDidChangeTextDocument(edit))
context.subscriptions.push(VS.workspace.onDidCloseTextDocument(close))
context.subscriptions.push(VS.window.onDidChangeTextEditorVisibleRanges(change => colorEditor(change.textEditor)))
}
// this method is called when your extension is deactivated
export function deactivate() {}