TypeScript jsonc-parser.visit函數代碼示例

function updateLaunchJsonDecorations(editor: vscode.TextEditor | undefined): void {
	if (!editor || path.basename(editor.document.fileName) !== 'launch.json') {
		return;
	}

	const ranges: vscode.Range[] = [];
	let addPropertyAndValue = false;
	let depthInArray = 0;
	visit(editor.document.getText(), {
		onObjectProperty: (property, offset, length) => {
			// Decorate attributes which are unlikely to be edited by the user.
			// Only decorate "configurations" if it is not inside an array (compounds have a configurations property which should not be decorated).
			addPropertyAndValue = property === 'version' || property === 'type' || property === 'request' || property === 'compounds' || (property === 'configurations' && depthInArray === 0);
			if (addPropertyAndValue) {
				ranges.push(new vscode.Range(editor.document.positionAt(offset), editor.document.positionAt(offset + length)));
			}
		},
		onLiteralValue: (value, offset, length) => {
			if (addPropertyAndValue) {
				ranges.push(new vscode.Range(editor.document.positionAt(offset), editor.document.positionAt(offset + length)));
			}
		},
		onArrayBegin: (offset: number, length: number) => {
			depthInArray++;
		},
		onArrayEnd: (offset: number, length: number) => {
			depthInArray--;
		}
	});

	editor.setDecorations(decoration, ranges);
}

export function findScriptAtPosition(buffer: string, offset: number): string | undefined {
	let script: string | undefined = undefined;
	let foundScript: string | undefined = undefined;
	let inScripts = false;
	let scriptStart: number | undefined;
	let visitor: JSONVisitor = {
		onError(_error: ParseErrorCode, _offset: number, _length: number) {
		},
		onObjectEnd() {
			if (inScripts) {
				inScripts = false;
				scriptStart = undefined;
			}
		},
		onLiteralValue(value: any, nodeOffset: number, nodeLength: number) {
			if (inScripts && scriptStart) {
				if (typeof value === 'string' && offset >= scriptStart && offset < nodeOffset + nodeLength) {
					// found the script
					inScripts = false;
					foundScript = script;
				} else {
					script = undefined;
				}
			}
		},
		onObjectProperty(property: string, nodeOffset: number) {
			if (property === 'scripts') {
				inScripts = true;
			}
			else if (inScripts) {
				scriptStart = nodeOffset;
				script = property;
			} else { // nested object which is invalid, ignore the script
				script = undefined;
			}
		}
	};
	visit(buffer, visitor);
	return foundScript;
}

function updateLaunchJsonDecorations(editor: vscode.TextEditor) {
	if (!editor || path.basename(editor.document.fileName) !== 'launch.json') {
		return;
	}

	const ranges = [];
	let addPropertyAndValue = false;
	visit(editor.document.getText(), {
		onObjectProperty: (property, offset, length) => {
			addPropertyAndValue = property === 'version' || property === 'type' || property === 'request' || property === 'configurations';
			if (addPropertyAndValue) {
				ranges.push(new vscode.Range(editor.document.positionAt(offset), editor.document.positionAt(offset + length)));
			}
		},
		onLiteralValue: (value, offset, length) => {
			if (addPropertyAndValue) {
				ranges.push(new vscode.Range(editor.document.positionAt(offset), editor.document.positionAt(offset + length)));
			}
		}
	});

	editor.setDecorations(decoration, ranges);
}

export function findAllScriptRanges(buffer: string): Map<string, [number, number, string]> {
	var scripts: Map<string, [number, number, string]> = new Map();
	let script: string | undefined = undefined;
	let offset: number;
	let length: number;

	let inScripts = false;

	let visitor: JSONVisitor = {
		onError(_error: ParseErrorCode, _offset: number, _length: number) {
		},
		onObjectEnd() {
			if (inScripts) {
				inScripts = false;
			}
		},
		onLiteralValue(value: any, _offset: number, _length: number) {
			if (script) {
				scripts.set(script, [offset, length, value]);
				script = undefined;
			}
		},
		onObjectProperty(property: string, off: number, len: number) {
			if (property === 'scripts') {
				inScripts = true;
			}
			else if (inScripts) {
				script = property;
				offset = off;
				length = len;
			}
		}
	};
	visit(buffer, visitor);
	return scripts;
}

async function findAllScripts(buffer: string): Promise<StringMap> {
	var scripts: StringMap = {};
	let script: string | undefined = undefined;
	let inScripts = false;

	let visitor: JSONVisitor = {
		onError(_error: ParseErrorCode, _offset: number, _length: number) {
			console.log(_error);
		},
		onObjectEnd() {
			if (inScripts) {
				inScripts = false;
			}
		},
		onLiteralValue(value: any, _offset: number, _length: number) {
			if (script) {
				if (typeof value === 'string') {
					scripts[script] = value;
				}
				script = undefined;
			}
		},
		onObjectProperty(property: string, _offset: number, _length: number) {
			if (property === 'scripts') {
				inScripts = true;
			}
			else if (inScripts && !script) {
				script = property;
			} else { // nested object which is invalid, ignore the script
				script = undefined;
			}
		}
	};
	visit(buffer, visitor);
	return scripts;
}

		let name: string = '';
		let lastProperty = '';
		let startOffset = 0;
		let depthInObjects = 0;

		visit(document.getText(), {
			onObjectProperty: (property, offset, length) => {
				lastProperty = property;
			},
			onLiteralValue: (value: any, offset: number, length: number) => {
				if (lastProperty === 'name') {
					name = value;
				}
			},
			onObjectBegin: (offset: number, length: number) => {
				depthInObjects++;
				if (depthInObjects === 2) {
					startOffset = offset;
				}
			},
			onObjectEnd: (offset: number, length: number) => {
				if (name && depthInObjects === 2) {
					result.push(new vscode.SymbolInformation(name, vscode.SymbolKind.Object, new vscode.Range(document.positionAt(startOffset), document.positionAt(offset))));
				}
				depthInObjects--;
			},
		});

		return result;
	}
});