Parse call expressions
This commit is contained in:
@ -9,14 +9,14 @@ FROM MemUtils IMPORT MemCopy, MemZero;
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FROM Common IMPORT Identifier, PIdentifier, ShortString;
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FROM Lexer IMPORT Lexer, LexerToken, lexer_current, lexer_lex, LexerKind;
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FROM Parser IMPORT AstTypeExpressionKind, AstExpressionKind, AstLiteralKind, AstUnaryOperator,
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AstModule, PAstModule, AstExpression, PAstExpression, PAstLiteral,
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FROM Parser IMPORT AstTypeExpressionKind, AstExpressionKind, AstLiteralKind, AstUnaryOperator, AstBinaryOperator,
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AstModule, PAstModule, AstExpression, PPAstExpression, PAstExpression, PAstLiteral,
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PAstConstantDeclaration, PPAstConstantDeclaration,
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AstTypeDeclaration, PAstTypeDeclaration, PPAstTypeDeclaration,
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PAstVariableDeclaration, PPAstVariableDeclaration, PAstImportStatement, PPAstImportStatement,
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PAstTypeExpression, PPAstTypeExpression, AstFieldDeclaration, PAstFieldDeclaration,
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parse_type_expression, parse_variable_part, parse_type_part, parse_constant_part, parse_import_part,
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parse_designator;
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parse_designator, parse_expression;
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(* Calls lexer_lex() but skips the comments. *)
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PROCEDURE transpiler_lex(lexer: PLexer): LexerToken;
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@ -40,8 +40,12 @@ END write_semicolon;
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PROCEDURE write_current(lexer: PLexer; output: File);
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VAR
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written_bytes: CARDINAL;
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count: CARDINAL;
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BEGIN
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written_bytes := WriteNBytes(output, ADDRESS(lexer^.Current - lexer^.Start), lexer^.Start)
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count := lexer^.current;
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DEC(count, lexer^.start);
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written_bytes := WriteNBytes(output, count, lexer^.start)
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END write_current;
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PROCEDURE transpile_import_statement(context: PTranspilerContext; import_statement: PAstImportStatement);
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VAR
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@ -385,59 +389,6 @@ BEGIN
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RETURN result
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END transpile_procedure_heading;
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PROCEDURE transpile_unchanged(context: PTranspilerContext; trailing_token: LexerKind);
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VAR
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token: LexerToken;
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written_bytes: CARDINAL;
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BEGIN
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token := lexer_current(context^.lexer);
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WHILE (token.kind <> trailing_token) AND (token.kind <> lexerKindEnd) DO
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written_bytes := 0;
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IF token.kind = lexerKindNull THEN
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WriteString(context^.output, 'NIL ');
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written_bytes := 1
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END;
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IF (token.kind = lexerKindBoolean) AND token.booleanKind THEN
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WriteString(context^.output, 'TRUE ');
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written_bytes := 1
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END;
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IF (token.kind = lexerKindBoolean) AND (~token.booleanKind) THEN
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WriteString(context^.output, 'FALSE ');
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written_bytes := 1
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END;
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IF token.kind = lexerKindOr THEN
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WriteString(context^.output, 'OR ');
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written_bytes := 1
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END;
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IF token.kind = lexerKindAnd THEN
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WriteString(context^.output, 'AND ');
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written_bytes := 1
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END;
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IF token.kind = lexerKindTilde THEN
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WriteString(context^.output, 'NOT ');
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written_bytes := 1
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END;
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IF written_bytes = 0 THEN
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write_current(context^.lexer, context^.output);
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WriteChar(context^.output, ' ')
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END;
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token := transpiler_lex(context^.lexer)
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END
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END transpile_unchanged;
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PROCEDURE parse_expression(lexer: PLexer): PAstExpression;
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VAR
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next_token: LexerToken;
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result: PAstExpression;
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written_bytes: CARDINAL;
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BEGIN
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result := parse_designator(lexer);
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written_bytes := WriteNBytes(StdErr, ADDRESS(lexer^.Current - lexer^.Start), lexer^.Start);
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WriteLine(StdErr);
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RETURN result
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END parse_expression;
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PROCEDURE transpile_unary_operator(context: PTranspilerContext; operator: AstUnaryOperator);
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BEGIN
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IF operator = astUnaryOperatorMinus THEN
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@ -447,11 +398,49 @@ BEGIN
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WriteChar(context^.output, '~')
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END
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END transpile_unary_operator;
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PROCEDURE transpile_binary_operator(context: PTranspilerContext; operator: AstBinaryOperator);
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BEGIN
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IF operator = astBinaryOperatorSum THEN
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WriteChar(context^.output, '+')
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END;
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IF operator = astBinaryOperatorSubtraction THEN
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WriteChar(context^.output, '-')
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END;
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IF operator = astBinaryOperatorMultiplication THEN
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WriteChar(context^.output, '*')
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END;
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IF operator = astBinaryOperatorEquals THEN
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WriteChar(context^.output, '=')
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END;
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IF operator = astBinaryOperatorNotEquals THEN
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WriteChar(context^.output, '#')
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END;
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IF operator = astBinaryOperatorLess THEN
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WriteChar(context^.output, '<')
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END;
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IF operator = astBinaryOperatorGreater THEN
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WriteChar(context^.output, '>')
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END;
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IF operator = astBinaryOperatorLessEqual THEN
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WriteString(context^.output, '<=')
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END;
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IF operator = astBinaryOperatorGreaterEqual THEN
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WriteString(context^.output, '>=')
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END;
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IF operator = astBinaryOperatorDisjunction THEN
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WriteString(context^.output, 'OR')
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END;
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IF operator = astBinaryOperatorConjunction THEN
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WriteString(context^.output, 'AND')
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END
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END transpile_binary_operator;
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PROCEDURE transpile_expression(context: PTranspilerContext; expression: PAstExpression);
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VAR
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literal: PAstLiteral;
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buffer: ARRAY[1..20] OF CHAR;
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written_bytes: CARDINAL;
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argument_index: CARDINAL;
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current_argument: PPAstExpression;
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BEGIN
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IF expression^.kind = astExpressionKindLiteral THEN
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literal := expression^.literal;
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@ -462,7 +451,16 @@ BEGIN
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END;
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IF literal^.kind = astLiteralKindString THEN
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WriteString(context^.output, literal^.string)
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END
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END;
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IF literal^.kind = astLiteralKindNull THEN
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WriteString(context^.output, 'NIL')
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END;
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IF (literal^.kind = astLiteralKindBoolean) AND literal^.boolean THEN
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WriteString(context^.output, 'TRUE')
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END;
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IF (literal^.kind = astLiteralKindBoolean) AND (literal^.boolean = FALSE) THEN
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WriteString(context^.output, 'FALSE')
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END
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END;
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IF expression^.kind = astExpressionKindIdentifier THEN
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written_bytes := WriteNBytes(context^.output, ORD(expression^.identifier[1]), ADR(expression^.identifier[2]))
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@ -485,31 +483,53 @@ BEGIN
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IF expression^.kind = astExpressionKindUnary THEN
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transpile_unary_operator(context, expression^.unary_operator);
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transpile_expression(context, expression^.unary_operand)
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END;
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IF expression^.kind = astExpressionKindBinary THEN
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WriteChar(context^.output, '(');
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transpile_expression(context, expression^.lhs);
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WriteChar(context^.output, ' ');
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transpile_binary_operator(context, expression^.binary_operator);
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WriteChar(context^.output, ' ');
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transpile_expression(context, expression^.rhs);
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WriteChar(context^.output, ')')
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END;
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IF expression^.kind = astExpressionKindCall THEN
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transpile_expression(context, expression^.callable);
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WriteChar(context^.output, '(');
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current_argument := expression^.arguments;
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IF expression^.argument_count > 0 THEN
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transpile_expression(context, current_argument^);
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argument_index := 1;
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INC(current_argument, TSIZE(PAstExpression));
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WHILE argument_index < expression^.argument_count DO
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WriteString(context^.output, ', ');
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transpile_expression(context, current_argument^);
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INC(current_argument, TSIZE(PAstExpression));
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INC(argument_index)
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END
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END;
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WriteChar(context^.output, ')')
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END
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END transpile_expression;
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PROCEDURE transpile_if_statement(context: PTranspilerContext);
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VAR
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token: LexerToken;
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expression: PAstExpression;
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lexer: Lexer;
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condition: PAstExpression;
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BEGIN
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WriteString(context^.output, ' IF ');
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lexer := context^.lexer^;
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token := transpiler_lex(ADR(lexer));
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expression := parse_expression(ADR(lexer));
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token := transpiler_lex(context^.lexer);
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condition := parse_expression(context^.lexer);
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IF expression <> NIL THEN
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context^.lexer^ := lexer;
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transpile_expression(context, expression);
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WriteChar(context^.output, ' ')
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END;
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IF expression = NIL THEN
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token := transpiler_lex(context^.lexer)
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END;
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transpile_unchanged(context, lexerKindThen);
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transpile_expression(context, condition);
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token := lexer_current(context^.lexer);
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WriteString(context^.output, 'THEN');
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WriteString(context^.output, ' THEN');
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WriteLine(context^.output);
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transpile_statements(context);
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WriteString(context^.output, ' END');
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@ -518,12 +538,17 @@ END transpile_if_statement;
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PROCEDURE transpile_while_statement(context: PTranspilerContext);
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VAR
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token: LexerToken;
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condition: PAstExpression;
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BEGIN
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WriteString(context^.output, ' WHILE ');
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token := transpiler_lex(context^.lexer);
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transpile_unchanged(context, lexerKindDo);
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WriteString(context^.output, 'DO');
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token := transpiler_lex(context^.lexer);
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condition := parse_expression(context^.lexer);
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transpile_expression(context, condition);
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token := lexer_current(context^.lexer);
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WriteString(context^.output, ' DO');
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WriteLine(context^.output);
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transpile_statements(context);
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WriteString(context^.output, ' END');
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@ -532,10 +557,14 @@ END transpile_while_statement;
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PROCEDURE transpile_assignment_statement(context: PTranspilerContext);
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VAR
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token: LexerToken;
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assignment: PAstExpression;
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BEGIN
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WriteString(context^.output, ' := ');
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token := transpiler_lex(context^.lexer);
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transpile_unchanged(context, lexerKindSemicolon);
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assignment := parse_expression(context^.lexer);
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transpile_expression(context, assignment)
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END transpile_assignment_statement;
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PROCEDURE transpile_call_statement(context: PTranspilerContext);
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VAR
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@ -595,14 +624,17 @@ END transpile_designator_expression;
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PROCEDURE transpile_return_statement(context: PTranspilerContext);
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VAR
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token: LexerToken;
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return_expression: PAstExpression;
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BEGIN
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WriteString(context^.output, ' RETURN ');
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token := transpiler_lex(context^.lexer);
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transpile_unchanged(context, lexerKindSemicolon)
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return_expression := parse_expression(context^.lexer);
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transpile_expression(context, return_expression)
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END transpile_return_statement;
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PROCEDURE transpile_statement(context: PTranspilerContext);
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VAR
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token: LexerToken;
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written_bytes: CARDINAL;
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BEGIN
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token := transpiler_lex(context^.lexer);
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@ -620,7 +652,13 @@ BEGIN
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token := lexer_current(context^.lexer);
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IF token.kind = lexerKindAssignment THEN
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transpile_assignment_statement(context)
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transpile_assignment_statement(context);
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token := lexer_current(context^.lexer);
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IF (token.kind <> lexerKindSemicolon) AND (token.kind <> lexerKindEnd) THEN
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written_bytes := WriteNBytes(StdErr, 10, context^.lexer^.start);
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WriteLine(StdErr)
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END
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END;
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IF token.kind = lexerKindLeftParen THEN
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transpile_call_statement(context)
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