public void WriteExpr(CompilationUnit compUnit)
{
var compUnits = compUnit.CompUnits;
if (compUnits.Count == 1)
{
Token token = compUnits[0];
if (token.TokenType == TokenType.INT_CONST)
{
_vmWriter.WritePush("constant", Convert.ToInt32(token.Value));
}
else if (token.TokenType == TokenType.IDENTIFIER)
{
var sbUnit = SymbolTableManager.Find(token.Value);
_vmWriter.WritePush(sbUnit.Kind.ToString(), sbUnit.Number);
}
}
}
//
// subroutineBody: '{' varDec* statements '}'
public void CompileSubroutineBody(int depth, string subType, string subName, string className)
{
// compile: '{'
var leftBraceToken = Eat("{");
// compile: varDec*
while (_tokenizer.CurrentToken.Value == "var")
{
CompileVarDec(depth + 1);
}
_vmWriter.WriteFunction(string.Format("{0}.{1}", className, subName), SymbolTableManager.GetLocalsNum());
// if constructor -> allocate
if (subType == "constructor")
{
int wordsToAllocate = SymbolTableManager.GetFieldsNum();
_vmWriter.WritePush("constant", wordsToAllocate);
_vmWriter.WriteCall("Memory.alloc", 1);
_vmWriter.WritePop("pointer", 0);
}
else if (subType == "method")
{
_vmWriter.WritePush("argument", 0);
_vmWriter.WritePop("pointer", 0);
}
// compile: statements
CompileStatements(depth + 1);
// compile: '}'
var rightBraceToken = Eat("}");
}
