//
// varDec: 'var' type varName (',' varName)* ';'
public void CompileVarDec(int depth)
{
// compile: 'var'
var varToken = Eat("var");
// compile: type
var typeToken = EatType();
// compile: varName
var varNameToken = EatIdentifier();
// Add to symbol table
SymbolTableManager.AddToSubroutineSymbolTable(new SymbolTableItem {
Kind = VarKindType.LOCAL, Name = varNameToken.Value, Scope = VarScopeType.SUBROUTINE_LEVEL, Type = typeToken.Value
});
// compile: (',' varName)*
while (_tokenizer.CurrentToken.Value == ",")
{
// compile: ','
var commaToken = Eat(",");
// compile varName
varNameToken = EatIdentifier();
// Add to symbol table
SymbolTableManager.AddToSubroutineSymbolTable(new SymbolTableItem {
Kind = VarKindType.LOCAL, Name = varNameToken.Value, Scope = VarScopeType.SUBROUTINE_LEVEL, Type = typeToken.Value
});
}
// compile: ';'
var semiColonToken = Eat(";");
}
//
// ('constructor'|'function'|'method') ('void'|type) subtroutineName '(' parameterList ')' subroutineBody
public void CompileSubroutineDec(int depth, string className)
{
// Reset SymbolTable
SymbolTableManager.ResetSubroutineSymbolTable();
// compile: ('constructor'|'function'|'method')
var subToken = EatSubroutine();
if (subToken.Value != "function" && subToken.Value != "constructor")
{
SymbolTableManager.AddToSubroutineSymbolTable(new SymbolTableItem {
Name = "this", Type = className, Scope = VarScopeType.SUBROUTINE_LEVEL, Kind = VarKindType.ARGUMENT
});
}
// compile: ('void'|type)
var subTypeToken = SoftEatType() ?? Eat("void");
// compile: subtroutineName
var subNameToken = EatIdentifier();
// compile: '('
var leftParenToken = Eat("(");
// compile: parameterList
CompileParameterList(depth + 1);
// compile: ')'
var rightParenToken = Eat(")");
// compile: subroutineBody
CompileSubroutineBody(depth + 1, subToken.Value, subNameToken.Value, className);
}
//
// ( (type varName) (',' type varName)* )?
public void CompileParameterList(int depth)
{
bool commaEncountered = false;
// compile: ( (type varName) (',' type varName)* )?
while (_tokenizer.CurrentToken.GetKeywordType() == Types.KeywordType.BOOLEAN ||
_tokenizer.CurrentToken.GetKeywordType() == Types.KeywordType.INT ||
_tokenizer.CurrentToken.GetKeywordType() == Types.KeywordType.CHAR ||
_tokenizer.CurrentToken.TokenType == TokenType.IDENTIFIER || // Handle Array and Object types
commaEncountered)
{
// compile: type
var typeToken = EatType();
// compile: varName
var varNameToken = EatIdentifier();
// Add to symbol table
SymbolTableManager.AddToSubroutineSymbolTable(new SymbolTableItem {
Kind = VarKindType.ARGUMENT, Scope = VarScopeType.SUBROUTINE_LEVEL, Type = typeToken.Value, Name = varNameToken.Value
});
// compile: ','
if (_tokenizer.CurrentToken.Value == ",")
{
var commaToken = Eat(",");
commaEncountered = true;
continue;
}
else
{
commaEncountered = false;
}
break;
}
}