| 31 | * ``` |
| 32 | */ |
| 33 | export function parseParams(s: ITokenStream): Ast.Fn['params'] { |
| 34 | const items: Ast.Fn['params'] = []; |
| 35 | |
| 36 | s.expect(TokenKind.OpenParen); |
| 37 | s.next(); |
| 38 | |
| 39 | if (s.is(TokenKind.NewLine)) { |
| 40 | s.next(); |
| 41 | } |
| 42 | |
| 43 | while (!s.is(TokenKind.CloseParen)) { |
| 44 | const dest = parseDest(s); |
| 45 | |
| 46 | let optional = false; |
| 47 | let defaultExpr: Ast.Expression | undefined; |
| 48 | if (s.is(TokenKind.Question)) { |
| 49 | s.next(); |
| 50 | optional = true; |
| 51 | } else if (s.is(TokenKind.Eq)) { |
| 52 | s.next(); |
| 53 | defaultExpr = parseExpr(s, false); |
| 54 | } |
| 55 | let type: Ast.TypeSource | undefined; |
| 56 | if (s.is(TokenKind.Colon)) { |
| 57 | s.next(); |
| 58 | type = parseType(s); |
| 59 | } |
| 60 | |
| 61 | items.push({ dest, optional, default: defaultExpr, argType: type }); |
| 62 | |
| 63 | // separator |
| 64 | switch (s.getTokenKind()) { |
| 65 | case TokenKind.NewLine: { |
| 66 | s.next(); |
| 67 | break; |
| 68 | } |
| 69 | case TokenKind.Comma: { |
| 70 | s.next(); |
| 71 | if (s.is(TokenKind.NewLine)) { |
| 72 | s.next(); |
| 73 | } |
| 74 | break; |
| 75 | } |
| 76 | case TokenKind.CloseParen: { |
| 77 | break; |
| 78 | } |
| 79 | case TokenKind.EOF: { |
| 80 | throw new AiScriptUnexpectedEOFError(s.getPos()); |
| 81 | } |
| 82 | default: { |
| 83 | throw new AiScriptSyntaxError('separator expected', s.getPos()); |
| 84 | } |
| 85 | } |
| 86 | } |
| 87 | |
| 88 | s.expect(TokenKind.CloseParen); |
| 89 | s.next(); |
| 90 | |