Parse and transpile unary operations

source/Parser.elna

@@ -60,7 +60,7 @@ proc parse_record_type(lexer: PLexer) -> PAstTypeExpression;
 var
   result: PAstTypeExpression;
 begin
-  ALLOCATE(result, TSIZE(AstTypeExpression));
+  NEW(result);
   result^.kind := astTypeExpressionKindRecord;
   result^.fields := parse_type_fields(lexer);
 
@@ -72,7 +72,7 @@ var
   token: LexerToken;
   result: PAstTypeExpression;
 begin
-  ALLOCATE(result, TSIZE(AstTypeExpression));
+  NEW(result);
   result^.kind := astTypeExpressionKindPointer;
 
   token := lexer_current(lexer);
@@ -92,7 +92,7 @@ var
   buffer: [20]CHAR;
   result: PAstTypeExpression;
 begin
-  ALLOCATE(result, TSIZE(AstTypeExpression));
+  NEW(result);
   result^.kind := astTypeExpressionKindArray;
   result^.length := 0;
 
@@ -121,7 +121,7 @@ var
   current_case: PIdentifier;
   case_count: CARDINAL;
 begin
-  ALLOCATE(result, TSIZE(AstTypeExpression));
+  NEW(result);
   result^.kind := astTypeExpressionKindEnumeration;
 
   case_count := 1;
@@ -153,10 +153,9 @@ proc parse_named_type(lexer: PLexer) -> PAstTypeExpression;
 var
   token: LexerToken;
   result: PAstTypeExpression;
-  written_bytes: CARDINAL;
 begin
   token := lexer_current(lexer);
-  ALLOCATE(result, TSIZE(AstTypeExpression));
+  NEW(result);
 
   result^.kind := astTypeExpressionKindNamed;
   result^.name := token.identifierKind;
@@ -172,7 +171,7 @@ var
   parameter_count: CARDINAL;
 begin
   parameter_count := 0;
-  ALLOCATE(result, TSIZE(AstTypeExpression));
+  NEW(result);
   result^.kind := astTypeExpressionKindProcedure;
 
   ALLOCATE(result^.parameters, 1);
@@ -236,7 +235,7 @@ var
 begin
   token := lexer_current(lexer);
 
-  ALLOCATE(result, TSIZE(AstTypeDeclaration));
+  NEW(result);
   result^.identifier := token.identifierKind;
 
   token := transpiler_lex(lexer);
@@ -288,7 +287,7 @@ var
   token: LexerToken;
   result: PAstVariableDeclaration;
 begin
-  ALLOCATE(result, TSIZE(AstVariableDeclaration));
+  NEW(result);
 
   token := lexer_current(lexer);
   result^.variable_name := token.identifierKind;
@@ -342,7 +341,7 @@ var
   token: LexerToken;
   result: PAstConstantDeclaration;
 begin
-  ALLOCATE(result, TSIZE(AstConstantDeclaration));
+  NEW(result);
 
   token := lexer_current(lexer);
   result^.constant_name := token.identifierKind;
@@ -399,7 +398,7 @@ var
   symbol_count: CARDINAL;
   current_symbol: PIdentifier;
 begin
-  ALLOCATE(result, TSIZE(AstImportStatement));
+  NEW(result);
   symbol_count := 1;
 
   token := transpiler_lex(lexer);
@@ -463,4 +462,132 @@ begin
   return result
 end;
 
+proc parse_literal(lexer: PLexer) -> PAstLiteral;
+var
+  literal: PAstLiteral;
+  token: LexerToken;
+begin
+  literal := nil;
+  token := lexer_current(lexer);
+
+  if token.kind = lexerKindInteger then
+    NEW(literal);
+
+    literal^.kind := astLiteralKindInteger;
+    literal^.integer := token.integerKind;
+  end;
+  if token.kind = lexerKindCharacter then
+    NEW(literal);
+
+    literal^.kind := astLiteralKindString;
+    literal^.string := token.stringKind;
+  end;
+  if token.kind = lexerKindNull then
+    NEW(literal);
+
+    literal^.kind := astLiteralKindNull;
+  end;
+  if literal <> nil then
+    token := transpiler_lex(lexer)
+  end;
+
+  return literal
+end;
+
+proc parse_factor(lexer: PLexer) -> PAstExpression;
+var
+  next_token: LexerToken;
+  result: PAstExpression;
+  literal: PAstLiteral;
+begin
+  result := nil;
+  next_token := lexer_current(lexer);
+
+  literal := parse_literal(lexer);
+
+  if (result = nil) & (literal <> nil) then
+    NEW(result);
+
+    result^.kind := astExpressionKindLiteral;
+    result^.literal := literal;
+  end;
+  if (result = nil) & (next_token.kind = lexerKindMinus) then
+    NEW(result);
+    next_token := transpiler_lex(lexer);
+
+    result^.kind := astExpressionKindUnary;
+    result^.unary_operator := astUnaryOperatorMinus;
+    result^.unary_operand := parse_factor(lexer)
+  end;
+  if (result = nil) & (next_token.kind = lexerKindTilde) then
+    NEW(result);
+    next_token := transpiler_lex(lexer);
+
+    result^.kind := astExpressionKindUnary;
+    result^.unary_operator := astUnaryOperatorNot;
+    result^.unary_operand := parse_factor(lexer)
+  end;
+  if (result = nil) & (next_token.kind = lexerKindIdentifier) then
+    NEW(result);
+ 
+    result^.kind := astExpressionKindIdentifier;
+    result^.identifier := next_token.identifierKind;
+ 
+    next_token := transpiler_lex(lexer)
+  end;
+
+  return result
+end;
+
+proc parse_designator(lexer: PLexer) -> PAstExpression;
+var
+  next_token: LexerToken;
+  inner_expression: PAstExpression;
+  designator: PAstExpression;
+  handled: BOOLEAN;
+begin
+  designator := parse_factor(lexer);
+  handled := designator <> nil;
+  next_token := lexer_current(lexer);
+
+  while handled do
+    inner_expression := designator;
+    handled := false;
+
+    if ~handled & (next_token.kind = lexerKindHat) then
+      NEW(designator);
+
+      designator^.kind := astExpressionKindDereference;
+      designator^.reference := inner_expression;
+
+      next_token := transpiler_lex(lexer);
+      handled := true
+    end;
+    if ~handled & (next_token.kind = lexerKindLeftSquare) then
+      NEW(designator);
+      next_token := transpiler_lex(lexer);
+
+      designator^.kind := astExpressionKindArrayAccess;
+      designator^.array := inner_expression;
+      designator^.index := parse_designator(lexer);
+
+      next_token := transpiler_lex(lexer);
+      handled := true
+    end;
+    if ~handled & (next_token.kind = lexerKindDot) then
+      NEW(designator);
+      next_token := transpiler_lex(lexer);
+
+      designator^.kind := astExpressionKindFieldAccess;
+      designator^.aggregate := inner_expression;
+      designator^.field := next_token.identifierKind;
+
+      next_token := transpiler_lex(lexer);
+      handled := true
+    end
+  end;
+
+  return designator
+end;
+
 end.