625 lines
21 KiB
Modula-2
625 lines
21 KiB
Modula-2
IMPLEMENTATION MODULE Transpiler;
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FROM FIO IMPORT WriteNBytes, WriteLine, WriteChar, WriteString;
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FROM SYSTEM IMPORT ADR, TSIZE;
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FROM NumberIO IMPORT IntToStr;
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FROM Common IMPORT Identifier, PIdentifier, ShortString;
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FROM Parser IMPORT AstTypeExpressionKind, AstExpressionKind, AstLiteralKind, AstUnaryOperator, AstBinaryOperator,
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PAstModule, PPAstExpression, PAstExpression, PAstLiteral, PPAstProcedureDeclaration,
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PAstConstantDeclaration, PPAstConstantDeclaration, PPAstStatement, PAstStatement, AstStatementKind,
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AstTypedDeclaration, PAstTypedDeclaration, PPAstTypedDeclaration, AstCompoundStatement, PAstProcedureDeclaration,
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PAstVariableDeclaration, PPAstVariableDeclaration, PAstImportStatement, PPAstImportStatement,
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PAstTypeExpression, PPAstTypeExpression, AstFieldDeclaration, PAstFieldDeclaration;
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PROCEDURE indent(context: PTranspilerContext);
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VAR
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count: CARDINAL;
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BEGIN
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count := 0;
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WHILE count < context^.indentation DO
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WriteString(context^.output, ' ');
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INC(count)
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END
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END indent;
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(* Write a semicolon followed by a newline. *)
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PROCEDURE write_semicolon(output: File);
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BEGIN
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WriteChar(output, ';');
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WriteLine(output)
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END write_semicolon;
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PROCEDURE transpile_import_statement(context: PTranspilerContext; import_statement: PAstImportStatement);
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VAR
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written_bytes: CARDINAL;
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current_symbol: PIdentifier;
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BEGIN
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WriteString(context^.output, 'FROM ');
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written_bytes := WriteNBytes(context^.output, ORD(import_statement^.package[1]), ADR(import_statement^.package[2]));
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WriteString(context^.output, ' IMPORT ');
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current_symbol := import_statement^.symbols;
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written_bytes := WriteNBytes(context^.output, ORD(current_symbol^[1]), ADR(current_symbol^[2]));
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INC(current_symbol, TSIZE(Identifier));
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WHILE ORD(current_symbol^[1]) <> 0 DO
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WriteString(context^.output, ', ');
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written_bytes := WriteNBytes(context^.output, ORD(current_symbol^[1]), ADR(current_symbol^[2]));
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INC(current_symbol, TSIZE(Identifier))
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END;
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write_semicolon(context^.output)
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END transpile_import_statement;
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PROCEDURE transpile_import_part(context: PTranspilerContext; imports: PPAstImportStatement);
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VAR
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import_statement: PAstImportStatement;
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BEGIN
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WHILE imports^ <> NIL DO
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transpile_import_statement(context, imports^);
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INC(imports, TSIZE(PAstImportStatement))
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END;
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WriteLine(context^.output)
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END transpile_import_part;
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PROCEDURE transpile_constant_declaration(context: PTranspilerContext; declaration: PAstConstantDeclaration);
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VAR
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buffer: ARRAY[1..20] OF CHAR;
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written_bytes: CARDINAL;
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BEGIN
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WriteString(context^.output, ' ');
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written_bytes := WriteNBytes(context^.output, ORD(declaration^.constant_name[1]), ADR(declaration^.constant_name[2]));
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WriteString(context^.output, ' = ');
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IntToStr(declaration^.constant_value, 0, buffer);
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WriteString(context^.output, buffer);
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write_semicolon(context^.output)
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END transpile_constant_declaration;
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PROCEDURE transpile_constant_part(context: PTranspilerContext; declarations: PPAstConstantDeclaration; extra_newline: BOOLEAN);
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VAR
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current_declaration: PPAstConstantDeclaration;
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BEGIN
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IF declarations^ <> NIL THEN
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WriteString(context^.output, 'CONST');
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WriteLine(context^.output);
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current_declaration := declarations;
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WHILE current_declaration^ <> NIL DO
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transpile_constant_declaration(context, current_declaration^);
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INC(current_declaration, TSIZE(PAstConstantDeclaration))
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END;
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IF extra_newline THEN
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WriteLine(context^.output)
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END
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END
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END transpile_constant_part;
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PROCEDURE transpile_module(context: PTranspilerContext; result: PAstModule);
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BEGIN
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IF result^.main = FALSE THEN
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WriteString(context^.output, 'IMPLEMENTATION ')
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END;
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WriteString(context^.output, 'MODULE ');
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(* Write the module name and end the line with a semicolon and newline. *)
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transpile_module_name(context);
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write_semicolon(context^.output);
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WriteLine(context^.output);
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(* Write the module body. *)
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transpile_import_part(context, result^.imports);
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transpile_constant_part(context, result^.constants, TRUE);
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transpile_type_part(context, result^.types);
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transpile_variable_part(context, result^.variables, TRUE);
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transpile_procedure_part(context, result^.procedures);
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transpile_statement_part(context, result^.statements);
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WriteString(context^.output, 'END ');
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transpile_module_name(context);
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WriteChar(context^.output, '.');
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WriteLine(context^.output)
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END transpile_module;
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PROCEDURE transpile_type_fields(context: PTranspilerContext; fields: PAstFieldDeclaration);
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VAR
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written_bytes: CARDINAL;
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current_field: PAstFieldDeclaration;
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BEGIN
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current_field := fields;
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WHILE ORD(current_field^.field_name[1]) <> 0 DO
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WriteString(context^.output, ' ');
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written_bytes := WriteNBytes(context^.output, ORD(current_field^.field_name[1]), ADR(current_field^.field_name[2]));
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WriteString(context^.output, ': ');
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transpile_type_expression(context, current_field^.field_type);
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INC(current_field , TSIZE(AstFieldDeclaration));
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IF ORD(current_field^.field_name[1]) <> 0 THEN
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WriteChar(context^.output, ';')
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END;
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WriteLine(context^.output)
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END
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END transpile_type_fields;
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PROCEDURE transpile_record_type(context: PTranspilerContext; type_expression: PAstTypeExpression);
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BEGIN
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WriteString(context^.output, 'RECORD');
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WriteLine(context^.output);
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transpile_type_fields(context, type_expression^.fields);
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WriteString(context^.output, ' END')
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END transpile_record_type;
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PROCEDURE transpile_pointer_type(context: PTranspilerContext; type_expression: PAstTypeExpression);
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BEGIN
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WriteString(context^.output, 'POINTER TO ');
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transpile_type_expression(context, type_expression^.target)
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END transpile_pointer_type;
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PROCEDURE transpile_array_type(context: PTranspilerContext; type_expression: PAstTypeExpression);
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VAR
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buffer: ARRAY[1..20] OF CHAR;
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BEGIN
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WriteString(context^.output, 'ARRAY');
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IF type_expression^.length <> 0 THEN
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WriteString(context^.output, '[1..');
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IntToStr(type_expression^.length, 0, buffer);
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WriteString(context^.output, buffer);
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WriteChar(context^.output, ']')
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END;
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WriteString(context^.output, ' OF ');
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transpile_type_expression(context, type_expression^.base)
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END transpile_array_type;
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PROCEDURE transpile_enumeration_type(context: PTranspilerContext; type_expression: PAstTypeExpression);
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VAR
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current_case: PIdentifier;
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written_bytes: CARDINAL;
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BEGIN
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current_case := type_expression^.cases;
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WriteString(context^.output, '(');
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WriteLine(context^.output);
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WriteString(context^.output, ' ');
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written_bytes := WriteNBytes(context^.output, ORD(current_case^[1]), ADR(current_case^[2]));
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INC(current_case, TSIZE(Identifier));
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WHILE ORD(current_case^[1]) <> 0 DO
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WriteChar(context^.output, ',');
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WriteLine(context^.output);
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WriteString(context^.output, ' ');
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written_bytes := WriteNBytes(context^.output, ORD(current_case^[1]), ADR(current_case^[2]));
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INC(current_case, TSIZE(Identifier))
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END;
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WriteLine(context^.output);
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WriteString(context^.output, ' )')
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END transpile_enumeration_type;
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PROCEDURE transpile_named_type(context: PTranspilerContext; type_expression: PAstTypeExpression);
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VAR
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written_bytes: CARDINAL;
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BEGIN
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written_bytes := WriteNBytes(context^.output, ORD(type_expression^.name[1]), ADR(type_expression^.name[2]))
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END transpile_named_type;
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PROCEDURE transpile_procedure_type(context: PTranspilerContext; type_expression: PAstTypeExpression);
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VAR
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result: PAstTypeExpression;
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current_parameter: PPAstTypeExpression;
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parameter_count: CARDINAL;
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BEGIN
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WriteString(context^.output, 'PROCEDURE(');
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current_parameter := type_expression^.parameters;
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WHILE current_parameter^ <> NIL DO
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transpile_type_expression(context, current_parameter^);
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INC(current_parameter, TSIZE(PAstTypeExpression));
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IF current_parameter^ <> NIL THEN
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WriteString(context^.output, ', ')
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END
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END;
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WriteChar(context^.output, ')')
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END transpile_procedure_type;
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PROCEDURE transpile_type_expression(context: PTranspilerContext; type_expression: PAstTypeExpression);
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BEGIN
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IF type_expression^.kind = astTypeExpressionKindRecord THEN
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transpile_record_type(context, type_expression)
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END;
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IF type_expression^.kind = astTypeExpressionKindEnumeration THEN
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transpile_enumeration_type(context, type_expression)
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END;
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IF type_expression^.kind = astTypeExpressionKindArray THEN
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transpile_array_type(context, type_expression)
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END;
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IF type_expression^.kind = astTypeExpressionKindPointer THEN
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transpile_pointer_type(context, type_expression)
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END;
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IF type_expression^.kind = astTypeExpressionKindProcedure THEN
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transpile_procedure_type(context, type_expression)
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END;
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IF type_expression^.kind = astTypeExpressionKindNamed THEN
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transpile_named_type(context, type_expression)
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END
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END transpile_type_expression;
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PROCEDURE transpile_type_declaration(context: PTranspilerContext; declaration: PAstTypedDeclaration);
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VAR
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written_bytes: CARDINAL;
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BEGIN
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WriteString(context^.output, ' ');
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written_bytes := WriteNBytes(context^.output, ORD(declaration^.identifier[1]), ADR(declaration^.identifier[2]));
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WriteString(context^.output, ' = ');
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transpile_type_expression(context, declaration^.type_expression);
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write_semicolon(context^.output)
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END transpile_type_declaration;
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PROCEDURE transpile_type_part(context: PTranspilerContext; declarations: PPAstTypedDeclaration);
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VAR
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current_declaration: PPAstTypedDeclaration;
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BEGIN
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IF declarations^ <> NIL THEN
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WriteString(context^.output, 'TYPE');
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WriteLine(context^.output);
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current_declaration := declarations;
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WHILE current_declaration^ <> NIL DO
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transpile_type_declaration(context, current_declaration^);
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INC(current_declaration, TSIZE(PAstTypedDeclaration))
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END;
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WriteLine(context^.output)
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END
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END transpile_type_part;
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PROCEDURE transpile_variable_declaration(context: PTranspilerContext; declaration: PAstVariableDeclaration);
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VAR
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written_bytes: CARDINAL;
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BEGIN
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WriteString(context^.output, ' ');
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written_bytes := WriteNBytes(context^.output, ORD(declaration^.variable_name[1]), ADR(declaration^.variable_name[2]));
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WriteString(context^.output, ': ');
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transpile_type_expression(context, declaration^.variable_type);
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write_semicolon(context^.output)
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END transpile_variable_declaration;
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PROCEDURE transpile_variable_part(context: PTranspilerContext; declarations: PPAstVariableDeclaration; extra_newline: BOOLEAN);
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VAR
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current_declaration: PPAstVariableDeclaration;
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BEGIN
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IF declarations^ <> NIL THEN
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WriteString(context^.output, 'VAR');
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WriteLine(context^.output);
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current_declaration := declarations;
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WHILE current_declaration^ <> NIL DO
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transpile_variable_declaration(context, current_declaration^);
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INC(current_declaration, TSIZE(PAstVariableDeclaration))
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END;
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IF extra_newline THEN
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WriteLine(context^.output)
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END
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END
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END transpile_variable_part;
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PROCEDURE transpile_procedure_heading(context: PTranspilerContext; declaration: PAstProcedureDeclaration);
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VAR
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written_bytes: CARDINAL;
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parameter_index: CARDINAL;
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current_parameter: PAstTypedDeclaration;
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BEGIN
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WriteString(context^.output, 'PROCEDURE ');
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written_bytes := WriteNBytes(context^.output, ORD(declaration^.name[1]), ADR(declaration^.name[2]));
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WriteChar(context^.output, '(');
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parameter_index := 0;
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current_parameter := declaration^.parameters;
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WHILE parameter_index < declaration^.parameter_count DO
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written_bytes := WriteNBytes(context^.output, ORD(current_parameter^.identifier[1]), ADR(current_parameter^.identifier[2]));
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WriteString(context^.output, ': ');
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transpile_type_expression(context, current_parameter^.type_expression);
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INC(parameter_index);
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INC(current_parameter, TSIZE(AstTypedDeclaration));
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IF parameter_index <> declaration^.parameter_count THEN
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WriteString(context^.output, '; ')
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END
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END;
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WriteString(context^.output, ')');
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(* Check for the return type and write it. *)
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IF declaration^.return_type <> NIL THEN
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WriteString(context^.output, ': ');
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transpile_type_expression(context, declaration^.return_type)
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END;
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write_semicolon(context^.output)
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END transpile_procedure_heading;
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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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WriteChar(context^.output, '-')
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END;
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IF operator = astUnaryOperatorNot THEN
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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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IF literal^.kind = astLiteralKindInteger THEN
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IntToStr(literal^.integer, 0, buffer);
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WriteString(context^.output, buffer)
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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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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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END;
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IF expression^.kind = astExpressionKindDereference THEN
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transpile_expression(context, expression^.reference);
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WriteChar(context^.output, '^')
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END;
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IF expression^.kind = astExpressionKindArrayAccess THEN
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transpile_expression(context, expression^.array);
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WriteChar(context^.output, '[');
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transpile_expression(context, expression^.index);
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WriteChar(context^.output, ']')
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END;
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IF expression^.kind = astExpressionKindFieldAccess THEN
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transpile_expression(context, expression^.aggregate);
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WriteChar(context^.output, '.');
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written_bytes := WriteNBytes(context^.output, ORD(expression^.field[1]), ADR(expression^.field[2]))
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END;
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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; statement: PAstStatement);
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BEGIN
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WriteString(context^.output, 'IF ');
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transpile_expression(context, statement^.if_condition);
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WriteString(context^.output, ' THEN');
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WriteLine(context^.output);
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INC(context^.indentation);
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transpile_compound_statement(context, statement^.if_branch);
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DEC(context^.indentation);
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indent(context);
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WriteString(context^.output, 'END')
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END transpile_if_statement;
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PROCEDURE transpile_while_statement(context: PTranspilerContext; statement: PAstStatement);
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BEGIN
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WriteString(context^.output, 'WHILE ');
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transpile_expression(context, statement^.while_condition);
|
|
|
|
WriteString(context^.output, ' DO');
|
|
WriteLine(context^.output);
|
|
INC(context^.indentation);
|
|
|
|
transpile_compound_statement(context, statement^.while_body);
|
|
DEC(context^.indentation);
|
|
indent(context);
|
|
WriteString(context^.output, 'END')
|
|
END transpile_while_statement;
|
|
PROCEDURE transpile_assignment_statement(context: PTranspilerContext; statement: PAstStatement);
|
|
BEGIN
|
|
transpile_expression(context, statement^.assignee);
|
|
WriteString(context^.output, ' := ');
|
|
transpile_expression(context, statement^.assignment)
|
|
END transpile_assignment_statement;
|
|
PROCEDURE transpile_return_statement(context: PTranspilerContext; statement: PAstStatement);
|
|
BEGIN
|
|
WriteString(context^.output, 'RETURN ');
|
|
|
|
transpile_expression(context, statement^.returned)
|
|
END transpile_return_statement;
|
|
PROCEDURE transpile_compound_statement(context: PTranspilerContext; statement: AstCompoundStatement);
|
|
VAR
|
|
current_statement: PPAstStatement;
|
|
index: CARDINAL;
|
|
BEGIN
|
|
index := 0;
|
|
current_statement := statement.statements;
|
|
|
|
WHILE index < statement.count DO
|
|
transpile_statement(context, current_statement^);
|
|
|
|
INC(current_statement, TSIZE(PAstStatement));
|
|
INC(index);
|
|
|
|
IF index <> statement.count THEN
|
|
WriteChar(context^.output, ';')
|
|
END;
|
|
WriteLine(context^.output)
|
|
END
|
|
END transpile_compound_statement;
|
|
PROCEDURE transpile_statement(context: PTranspilerContext; statement: PAstStatement);
|
|
BEGIN
|
|
indent(context);
|
|
|
|
IF statement^.kind = astStatementKindIf THEN
|
|
transpile_if_statement(context, statement)
|
|
END;
|
|
IF statement^.kind = astStatementKindWhile THEN
|
|
transpile_while_statement(context, statement)
|
|
END;
|
|
IF statement^.kind = astStatementKindReturn THEN
|
|
transpile_return_statement(context, statement)
|
|
END;
|
|
IF statement^.kind = astStatementKindAssignment THEN
|
|
transpile_assignment_statement(context, statement)
|
|
END;
|
|
IF statement^.kind = astStatementKindCall THEN
|
|
transpile_expression(context, statement^.call)
|
|
END
|
|
END transpile_statement;
|
|
PROCEDURE transpile_statement_part(context: PTranspilerContext; compound: AstCompoundStatement);
|
|
BEGIN
|
|
IF compound.count > 0 THEN
|
|
WriteString(context^.output, 'BEGIN');
|
|
WriteLine(context^.output);
|
|
|
|
INC(context^.indentation);
|
|
transpile_compound_statement(context, compound);
|
|
DEC(context^.indentation)
|
|
END
|
|
END transpile_statement_part;
|
|
PROCEDURE transpile_procedure_declaration(context: PTranspilerContext; declaration: PAstProcedureDeclaration);
|
|
VAR
|
|
written_bytes: CARDINAL;
|
|
BEGIN
|
|
transpile_procedure_heading(context, declaration);
|
|
|
|
transpile_constant_part(context, declaration^.constants, FALSE);
|
|
transpile_variable_part(context, declaration^.variables, FALSE);
|
|
transpile_statement_part(context, declaration^.statements);
|
|
|
|
WriteString(context^.output, 'END ');
|
|
written_bytes := WriteNBytes(context^.output, ORD(declaration^.name[1]), ADR(declaration^.name[2]));
|
|
|
|
write_semicolon(context^.output)
|
|
END transpile_procedure_declaration;
|
|
PROCEDURE transpile_procedure_part(context: PTranspilerContext; declaration: PPAstProcedureDeclaration);
|
|
BEGIN
|
|
WHILE declaration^ <> NIL DO
|
|
transpile_procedure_declaration(context, declaration^);
|
|
WriteLine(context^.output);
|
|
|
|
INC(declaration, TSIZE(PAstProcedureDeclaration))
|
|
END
|
|
END transpile_procedure_part;
|
|
PROCEDURE transpile_module_name(context: PTranspilerContext);
|
|
VAR
|
|
counter: CARDINAL;
|
|
last_slash: CARDINAL;
|
|
BEGIN
|
|
counter := 1;
|
|
last_slash := 0;
|
|
|
|
WHILE (context^.input_name[counter] <> '.') AND (ORD(context^.input_name[counter]) <> 0) DO
|
|
IF context^.input_name[counter] = '/' THEN
|
|
last_slash := counter
|
|
END;
|
|
INC(counter)
|
|
END;
|
|
|
|
IF last_slash = 0 THEN
|
|
counter := 1
|
|
END;
|
|
IF last_slash <> 0 THEN
|
|
counter := last_slash + 1
|
|
END;
|
|
WHILE (context^.input_name[counter] <> '.') AND (ORD(context^.input_name[counter]) <> 0) DO
|
|
WriteChar(context^.output, context^.input_name[counter]);
|
|
INC(counter)
|
|
END
|
|
END transpile_module_name;
|
|
PROCEDURE transpile(ast_module: PAstModule; output: File; definition: File; input_name: ShortString);
|
|
VAR
|
|
context: TranspilerContext;
|
|
BEGIN
|
|
context.input_name := input_name;
|
|
context.output := output;
|
|
context.definition := definition;
|
|
context.indentation := 0;
|
|
|
|
transpile_module(ADR(context), ast_module)
|
|
END transpile;
|
|
END Transpiler.
|