public virtual void Visit(VariableDeclarationSequence node)
{
}
public Block(VariableDeclarationSequence vars, StatementSequence stmts)
{
AddChild(vars);
AddChild(stmts);
}
void VarDec(VariableDeclarationSequence vars)
{
Expect(16);
int sl = t.line;
int sc = t.col;
int el = la.line;
int ec = la.col+la.val.Length;
Expect(1);
if (SymbolTable.IsDeclaredInCurrentScope(t.val)) {
errors.SemErr(t.line, t.col, string.Format("Variable '{0}' is already declared in this scope", t.val));
} else if (SymbolTable.IsInScope(t.val)) {
errors.Warning(t.line, t.col, string.Format("Variable '{0}' hides variable with same name in outer block",t.val));
SymbolTable.DefineVariable(t.val);
} else {
SymbolTable.DefineVariable(t.val);
}
VariableDeclaration vd = new VariableDeclaration(new Variable(t.val));
vd.AddSequencePoint(sl,sc,el,ec);
vars.AddVariableDeclaration(vd);
Expect(11);
}
void VarDecStmt(out VariableDeclarationSequence vars)
{
vars = new VariableDeclarationSequence();
VarDec(vars);
while (la.kind == 16) {
VarDec(vars);
}
}
void BlockStmt(out Statement block)
{
Expect(3);
if (Options.BookVersion) {
errors.SemErr(t.line, t.col, "Variable declarations are only allowed when using the /coursesyntax switch. Type 'wc.exe /help' for more information");
While.Environment.Exit(1);
}
VariableDeclarationSequence vars = new VariableDeclarationSequence();
SymbolTable.PushScope();
int sl = t.line;
int sc = t.col;
int el = t.line;
int ec = t.col+t.val.Length;
if (la.kind == 16) {
VarDecStmt(out vars);
}
StatementSequence statements;
StmtSeq(out statements);
Expect(4);
block = new Block(vars, statements);
block.AddSequencePoint(sl,sc,el,ec);
block.AddSequencePoint(t);
SymbolTable.PopScope();
}