private BooleanExpression parseBooleanExpression() {
Expression left = parseExpression();
TokenType type = myLexer.nextToken();
ComparisonOperation operation = BOOLEAN_OPERATIONS.get(type);
if (operation == null) {
throw new ParsingException(
"'<', '>', '<=', '>=', '!=' or '==' expected but " + myLexer.getToken() + " found");
}
Expression right = parseExpression();
return new ComparisonExpression(operation, left, right);
}
static {
BOOLEAN_OPERATIONS.put(TokenType.EQUAL, Operations.EQUAL);
BOOLEAN_OPERATIONS.put(TokenType.LESS, Operations.LESS);
BOOLEAN_OPERATIONS.put(TokenType.GREATER, Operations.GREATER);
BOOLEAN_OPERATIONS.put(TokenType.GREATER_EQ, Operations.GREATER_EQ);
BOOLEAN_OPERATIONS.put(TokenType.LESS_EQ, Operations.LESS_EQ);
BOOLEAN_OPERATIONS.put(TokenType.NOT_EQ, Operations.NOT_EQ);
}