Examples with ParenExpressionTree com.google.javascript.jscomp.parsing.parser.trees.ParenExpressionTree used on opensource projects

Example 1 with ParenExpressionTree

use of com.google.javascript.jscomp.parsing.parser.trees.ParenExpressionTree in project closure-compiler by google.

the class Parser method parseCoverParenthesizedExpressionAndArrowParameterList.

// 12.2 Primary Expression
// CoverParenthesizedExpressionAndArrowParameterList ::=
// ( Expression )
// ( Expression, )
// ( )
// ( ... BindingIdentifier )
// ( Expression , ... BindingIdentifier )
private ParseTree parseCoverParenthesizedExpressionAndArrowParameterList() {
    if (peekType(1) == TokenType.FOR) {
        return parseGeneratorComprehension();
    }
    SourcePosition start = getTreeStartLocation();
    eat(TokenType.OPEN_PAREN);
    // Case ( )
    if (peek(TokenType.CLOSE_PAREN)) {
        eat(TokenType.CLOSE_PAREN);
        if (peek(TokenType.ARROW)) {
            return new FormalParameterListTree(getTreeLocation(start), ImmutableList.<ParseTree>of(), /* hasTrailingComma= */
            false, ImmutableList.<SourcePosition>of());
        } else {
            reportError("invalid parenthesized expression");
            return new MissingPrimaryExpressionTree(getTreeLocation(start));
        }
    }
    // Case ( ... BindingIdentifier )
    if (peek(TokenType.ELLIPSIS)) {
        ImmutableList<ParseTree> params = ImmutableList.of(parseParameter());
        eat(TokenType.CLOSE_PAREN);
        if (peek(TokenType.ARROW)) {
            return new FormalParameterListTree(getTreeLocation(start), params, /* hasTrailingComma= */
            false, ImmutableList.<SourcePosition>of());
        } else {
            reportError("invalid parenthesized expression");
            return new MissingPrimaryExpressionTree(getTreeLocation(start));
        }
    }
    // For either of the three remaining cases:
    // ( Expression )
    // ( Expression, )
    // ( Expression, ...BindingIdentifier )
    // we can parse as an expression.
    ParseTree result = parseExpression();
    // case.
    if (peek(TokenType.COMMA)) {
        if (peek(1, TokenType.CLOSE_PAREN)) {
            // Create the formal parameter list here so we can record
            // the trailing comma
            resetScanner(start);
            // parseFormalParameterList will take care of reporting errors.
            return parseFormalParameterList();
        } else {
            eat(TokenType.COMMA);
            // Since we already parsed as an expression, we will guaranteed reparse this expression
            // as an arrow function parameter list, but just leave it as a comma expression for now.
            result = new CommaExpressionTree(getTreeLocation(start), ImmutableList.of(result, parseParameter()));
        }
    }
    eat(TokenType.CLOSE_PAREN);
    return new ParenExpressionTree(getTreeLocation(start), result);
}