Function parseStatement

src/parser/syntaxes/statements.ts:11–66

(s: ITokenStream)

import type { ITokenStream } from '../streams/token-stream.js';

export function parseStatement(s: ITokenStream): Ast.Statement | Ast.Expression {
	const startPos = s.getPos();

	switch (s.getTokenKind()) {
		case TokenKind.VarKeyword:
		case TokenKind.LetKeyword: {
			return parseVarDef(s);
		}
		case TokenKind.At: {
			// 識別子が続く場合はFnDef、そうでなければFnExpr
			if (s.lookahead(1).kind === TokenKind.Identifier) {
				return parseFnDef(s);
			}
			break;
		}
		case TokenKind.Out: {
			return parseOut(s);
		}
		case TokenKind.ReturnKeyword: {
			return parseReturn(s);
		}
		case TokenKind.OpenSharpBracket: {
			return parseStatementWithAttr(s);
		}
		case TokenKind.Sharp: {
			return parseStatementWithLabel(s);
		}
		case TokenKind.EachKeyword: {
			return parseEach(s);
		}
		case TokenKind.ForKeyword: {
			return parseFor(s);
		}
		case TokenKind.LoopKeyword: {
			return parseLoop(s);
		}
		case TokenKind.DoKeyword: {
			return parseDoWhile(s);
		}
		case TokenKind.WhileKeyword: {
			return parseWhile(s);
		}
		case TokenKind.BreakKeyword: {
			return parseBreak(s);
		}
		case TokenKind.ContinueKeyword: {
			return parseContinue(s);
		}
	}
	const expr = parseExpr(s, false);
	const assign = tryParseAssign(s, expr);
	if (assign) {
		return assign;
	}
	return expr;
}

/**