public YuToken RBrace()
{
YuToken ret = this.CurrToken;
this.Match(ETokenType.RBrace);
return(ret);
}
public YuToken Def()
{
YuToken ret = this.CurrToken;
this.Match(ETokenType.Def);
return(ret);
}
public YuToken Call()
{
YuToken ret = this.CurrToken;
this.Match(ETokenType.Call);
return(ret);
}
public YuToken Symbol()
{
YuToken ret = this.CurrToken;
this.Match(ETokenType.Symbol);
return(ret);
}
public YuToken Equal()
{
YuToken ret = this.CurrToken;
this.Match(ETokenType.Equal);
return(ret);
}
public YuToken Var()
{
YuToken ret = this.CurrToken;
this.Match(ETokenType.Var);
return(ret);
}
public YuToken ExpAdd()
{
YuToken ret = this.CurrToken;
this.Match(ETokenType.ExpAdd);
return(ret);
}
public YuToken SemiColon()
{
YuToken ret = this.CurrToken;
this.Match(ETokenType.SemiColon);
return(ret);
}
public YuSymbolTableRow(ESymbolType stype, YuToken token)
{
this.SymbolType = stype;
this.SymbolToken = token;
this.ProcTree = null;
this.AbsoluteAddr = -1;
}
public YuToken Number()
{
YuToken ret = this.CurrToken;
this.Match(ETokenType.Number);
return(ret);
}
public YuSymbolTableRow(ESymbolType stype, YuToken token, YuTreeNode tree)
{
this.SymbolType = stype;
this.SymbolToken = token;
this.ProcTree = tree;
this.AbsoluteAddr = -1;
}
public YuTreeNode ExpStat()
{
YuToken a = this.Term();
YuToken exp = null;
YuToken b = null;
YuTreeNode ret = null;
while (this.CurrToken.Type != ETokenType.SemiColon && this.CurrToken.Type != ETokenType.Eof)
{
exp = this.ExpAdd();
b = this.Term();
if (ret == null)
{
ret = new YuTreeNode(exp);
ret.Children.Add(new YuTreeNode(a));
ret.Children.Add(new YuTreeNode(b));
}
else
{
YuTreeNode tmp = new YuTreeNode(exp);
tmp.Children.Add(ret);
tmp.Children.Add(new YuTreeNode(b));
ret = tmp;
}
}
this.SemiColon();
if (exp == null)
{
ret = new YuTreeNode(a);
}
return(ret);
}
public YuToken RParen()
{
YuToken ret = this.CurrToken;
this.Match(ETokenType.RParen);
return(ret);
}
public YuToken Let()
{
YuToken ret = this.CurrToken;
this.Match(ETokenType.Let);
return(ret);
}
/*
* public YuTreeNode CalcStat()
* {
* YuToken a = this.Number();
* YuToken b = this.ExpAdd();
* YuToken c = this.Number();
* this.SemiColon();
*
* YuTreeNode ret = new YuTreeNode(b);
* ret.Children.Add(new YuTreeNode(a));
* ret.Children.Add(new YuTreeNode(c));
*
* return ret;
* }
*
* public YuTreeNode VCalcStat()
* {
* YuToken a = this.Symbol();
* YuToken b = this.ExpAdd();
* YuToken c = this.Number();
* this.SemiColon();
*
* YuTreeNode ret = new YuTreeNode(b);
* ret.Children.Add(new YuTreeNode(a));
* ret.Children.Add(new YuTreeNode(c));
*
* return ret;
* }
*/
public YuTreeNode VarDefStat()
{
YuToken a = this.Var();
YuToken b = this.Symbol();
this.SemiColon();
YuTreeNode ret = new YuTreeNode(a);
ret.Children.Add(new YuTreeNode(b));
return(ret);
}
public YuToken Term()
{
YuToken ret = this.CurrToken;
if (ret.Type == ETokenType.Number)
{
this.Match(ETokenType.Number);
}
else
{
this.Match(ETokenType.Symbol);
}
return(ret);
}
public YuTreeNode CallStat()
{
YuToken a = this.Call();
YuToken b = this.Symbol();
this.LParen();
this.RParen();
this.SemiColon();
YuTreeNode ret = new YuTreeNode(a);
ret.Children.Add(new YuTreeNode(b));
return(ret);
}
public YuTreeNode ProcDefStat()
{
YuToken a = this.Def();
YuToken b = this.Symbol();
YuTreeNode ret = new YuTreeNode(a);
ret.Children.Add(new YuTreeNode(b));
this.LBrace();
while (this.CurrToken.Type != ETokenType.RBrace && this.CurrToken.Type != ETokenType.Eof)
{
ret.Children.Add(this.Statement());
}
this.RBrace();
return(ret);
}
public YuTreeNode AssignStat()
{
this.Let();
YuToken a = this.Symbol();
YuToken b = this.Equal();
YuTreeNode n = this.ExpStat();
/*
* if (this.CurrToken.Type == ETokenType.Number)
* n = this.CalcStat();
* else
* n = this.VCalcStat();
*/
YuTreeNode ret = new YuTreeNode(b);
ret.Children.Add(new YuTreeNode(a));
ret.Children.Add(n);
return(ret);
}
public YuTreeNode(YuToken t)
: base(t)
{
this.Children = new List <YuTreeNode>();
}
public YuTreeLeaf(YuToken t)
{
this.Token = t;
}
public override YuToken NextToken()
{
while (this.Idx < this.Src.Length)
{
switch (this.Src[this.Idx])
{
case ' ':
case '\t':
case '\r':
case '\n':
WhiteSpace();
continue;
case '+':
this.Consume();
return(new YuToken(ETokenType.ExpAdd, "+"));
case ';':
this.Consume();
return(new YuToken(ETokenType.SemiColon, ";"));
case '=':
this.Consume();
return(new YuToken(ETokenType.Equal, "="));
case '{':
this.Consume();
return(new YuToken(ETokenType.LBrace, "{"));
case '}':
this.Consume();
return(new YuToken(ETokenType.RBrace, "}"));
case '(':
this.Consume();
return(new YuToken(ETokenType.LParen, "("));
case ')':
this.Consume();
return(new YuToken(ETokenType.RParen, ")"));
default:
if (this.IsNumeric())
{
return(this.Number());
}
if (this.IsLetter())
{
YuToken token = this.Symbol();
if (token.Text.ToUpper().Equals("VAR"))
{
token = new YuToken(ETokenType.Var, token.Text);
}
else if (token.Text.ToUpper().Equals("LET"))
{
token = new YuToken(ETokenType.Let, token.Text);
}
else if (token.Text.ToUpper().Equals("DEF"))
{
token = new YuToken(ETokenType.Def, token.Text);
}
else if (token.Text.ToUpper().Equals("CALL"))
{
token = new YuToken(ETokenType.Call, token.Text);
}
return(token);
}
throw new YuUnKnownTokenException();
}
}
return(new YuToken(ETokenType.Eof, "<EOF>"));
}
public Parser(Lexer lex)
{
this.Lex = lex;
this.CurrToken = this.Lex.NextToken();
}
/// <summary>
/// トークンを消費する
/// </summary>
public void Consume()
{
this.CurrToken = this.Lex.NextToken();
}