List <Statement> ParseStatementList(Scope scope)
{
List <Statement> c = new List <Statement>();
while (!isClosing(tok.Peek().Data) && !tok.IsEof())
{
Statement nodeStatement = ParseStatement(scope);
//stats[#stats+1] = nodeStatement
c.Add(nodeStatement);
}
return(c);
}
Statement ParseStatement(Scope scope)
{
int startP = reader.p;
int startLine = reader.Peek().Line;
Statement stat = null;
// print(tok.Peek().Print())
if (reader.ConsumeKeyword("if"))
{
//setup
IfStmt _if = new IfStmt();
//clauses
do
{
int sP = reader.p;
Expression nodeCond = ParseExpr(scope);
if (!reader.ConsumeKeyword("then"))
{
error("'then' expected");
}
List <Statement> nodeBody = ParseStatementList(scope);
List <Token> range = new List <Token>();
range.Add(reader.tokens[sP - 1]);
range.AddRange(reader.Range(sP, reader.p));
_if.Clauses.Add(new ElseIfStmt(scope)
{
Condition = nodeCond,
Body = nodeBody,
ScannedTokens = range
});
}while (reader.ConsumeKeyword("elseif"));
// else clause
if (reader.ConsumeKeyword("else"))
{
int sP = reader.p;
List <Statement> nodeBody = ParseStatementList(scope);
List <Token> range = new List <Token>();
range.Add(reader.tokens[sP - 1]);
range.AddRange(reader.Range(sP, reader.p));
_if.Clauses.Add(new ElseStmt(scope)
{
Body = nodeBody,
ScannedTokens = range
});
}
// end
if (!reader.ConsumeKeyword("end"))
{
error("'end' expected");
}
stat = _if;
}
else if (reader.ConsumeKeyword("while"))
{
WhileStatement w = new WhileStatement(scope);
// condition
Expression nodeCond = ParseExpr(scope);
// do
if (!reader.ConsumeKeyword("do"))
{
error("'do' expected");
}
// body
List <Statement> body = ParseStatementList(scope);
//end
if (!reader.ConsumeKeyword("end"))
{
error("'end' expected");
}
// return
w.Condition = nodeCond;
w.Body = body;
stat = w;
}
else if (reader.ConsumeKeyword("do"))
{
// do block
List <Statement> b = ParseStatementList(scope);
if (!reader.ConsumeKeyword("end"))
{
error("'end' expected");
}
stat = new DoStatement(scope)
{
Body = b
};
}
else if (reader.ConsumeKeyword("for"))
{
//for block
if (!reader.Is(TokenType.Ident))
{
error("<ident> expected");
}
Token baseVarName = reader.Get();
if (reader.ConsumeSymbol('='))
{
//numeric for
NumericForStatement forL = new NumericForStatement(scope);
Variable forVar = new Variable()
{
Name = baseVarName.Data
};
forL.Scope.AddLocal(forVar);
Expression startEx = ParseExpr(scope);
if (!reader.ConsumeSymbol(','))
{
error("',' expected");
}
Expression endEx = ParseExpr(scope);
Expression stepEx = null;
if (reader.ConsumeSymbol(','))
{
stepEx = ParseExpr(scope);
}
if (!reader.ConsumeKeyword("do"))
{
error("'do' expected");
}
List <Statement> body = ParseStatementList(forL.Scope);
if (!reader.ConsumeKeyword("end"))
{
error("'end' expected");
}
forL.Variable = forVar;
forL.Start = startEx;
forL.End = endEx;
forL.Step = stepEx;
forL.Body = body;
stat = forL;
}
else
{
// generic for
GenericForStatement forL = new GenericForStatement(scope);
List <Variable> varList = new List <Variable> {
forL.Scope.CreateLocal(baseVarName.Data)
};
while (reader.ConsumeSymbol(','))
{
if (!reader.Is(TokenType.Ident))
{
error("for variable expected");
}
varList.Add(forL.Scope.CreateLocal(reader.Get().Data));
}
if (!reader.ConsumeKeyword("in"))
{
error("'in' expected");
}
List <Expression> generators = new List <Expression>();
Expression first = ParseExpr(scope);
generators.Add(first);
while (reader.ConsumeSymbol(','))
{
Expression gen = ParseExpr(scope);
generators.Add(gen);
}
if (!reader.ConsumeKeyword("do"))
{
error("'do' expected");
}
List <Statement> body = ParseStatementList(forL.Scope);
if (!reader.ConsumeKeyword("end"))
{
error("'end' expected");
}
forL.VariableList = varList;
forL.Generators = generators;
forL.Body = body;
stat = forL;
}
}
else if (reader.ConsumeKeyword("repeat"))
{
List <Statement> body = ParseStatementList(scope);
if (!reader.ConsumeKeyword("until"))
{
error("'until' expected");
}
Expression cond = ParseExpr(scope);
RepeatStatement r = new RepeatStatement(scope);
r.Condition = cond;
r.Body = body;
stat = r;
}
else if (reader.ConsumeKeyword("function"))
{
if (!reader.Is(TokenType.Ident))
{
error("function name expected");
}
Expression name = ParseSuffixedExpr(scope, true);
// true: only dots and colons
FunctionStatement func = ParseFunctionArgsAndBody(scope);
func.IsLocal = false;
func.Name = name;
stat = func;
}
else if (reader.ConsumeKeyword("local"))
{
if (reader.Is(TokenType.Ident))
{
List <string> varList = new List <string> {
reader.Get().Data
};
while (reader.ConsumeSymbol(','))
{
if (!reader.Is(TokenType.Ident))
{
error("local variable name expected");
}
varList.Add(reader.Get().Data);
}
List <Expression> initList = new List <Expression>();
if (reader.ConsumeSymbol('='))
{
do
{
Expression ex = ParseExpr(scope);
initList.Add(ex);
} while (reader.ConsumeSymbol(','));
}
//now patch var list
//we can't do this before getting the init list, because the init list does not
//have the locals themselves in scope.
List <Expression> newVarList = new List <Expression>();
for (int i = 0; i < varList.Count; i++)
{
Variable x = scope.CreateLocal(varList[i]);
newVarList.Add(new VariableExpression {
Var = x
});
}
AssignmentStatement l = new AssignmentStatement();
l.Lhs = newVarList;
l.Rhs = initList;
l.IsLocal = true;
stat = l;
}
else if (reader.ConsumeKeyword("function"))
{
if (!reader.Is(TokenType.Ident))
{
error("Function name expected");
}
string name = reader.Get().Data;
Variable localVar = scope.CreateLocal(name);
FunctionStatement func = ParseFunctionArgsAndBody(scope);
func.Name = new VariableExpression {
Var = localVar
};
func.IsLocal = true;
stat = func;
}
else
{
error("local variable or function definition expected");
}
}
#if !VANILLA_LUA
else if (reader.ConsumeSymbol("::"))
{
if (!reader.Is(TokenType.Ident))
{
error("label name expected");
}
string label = reader.Get().Data;
if (!reader.ConsumeSymbol("::"))
{
error("'::' expected");
}
LabelStatement l = new LabelStatement();
l.Label = label;
stat = l;
}
#endif
else if (reader.ConsumeKeyword("return"))
{
List <Expression> exprList = new List <Expression>();
if (!reader.IsKeyword("end") && !reader.IsEof())
{
Expression firstEx = ParseExpr(scope);
exprList.Add(firstEx);
while (reader.ConsumeSymbol(','))
{
Expression ex = ParseExpr(scope);
exprList.Add(ex);
}
}
ReturnStatement r = new ReturnStatement();
r.Arguments = exprList;
stat = r;
}
else if (reader.ConsumeKeyword("break"))
{
stat = new BreakStatement();
}
else if (reader.ConsumeKeyword("continue"))
{
stat = new ContinueStatement();
}
#if !VANILLA_LUA
else if (reader.ConsumeKeyword("goto"))
{
if (!reader.Is(TokenType.Ident))
{
error("label expected");
}
string label = reader.Get().Data;
GotoStatement g = new GotoStatement();
g.Label = label;
stat = g;
}
else if (reader.ConsumeKeyword("using"))
{
// using <a, b = 1, x()> do <statements> end
UsingStatement us = new UsingStatement(scope);
us.Scope = new Scope(scope);
List <Expression> lhs = new List <Expression> {
ParseExpr(us.Scope)
};
while (reader.ConsumeSymbol(','))
{
lhs.Add(ParseSuffixedExpr(us.Scope, true));
}
// equals
if (!reader.ConsumeSymbol('='))
{
error("'=' expected");
}
//rhs
List <Expression> rhs = new List <Expression>();
rhs.Add(ParseExpr(us.Scope));
while (reader.ConsumeSymbol(','))
{
rhs.Add(ParseExpr(scope));
}
AssignmentStatement a = new AssignmentStatement();
a.Lhs = lhs;
a.Rhs = rhs;
a.IsLocal = true;
if (!reader.ConsumeKeyword("do"))
{
error("'do' expected");
}
List <Statement> block = ParseStatementList(us.Scope);
if (!reader.ConsumeKeyword("end"))
{
error("'end' expected");
}
us.Vars = a;
us.Body = block;
stat = us;
}
#endif
else
{
// statementParseExpr
Expression suffixed = ParseSuffixedExpr(scope);
// assignment or call?
if (reader.IsSymbol(',') || reader.IsSymbol('='))
{
// check that it was not parenthesized, making it not an lvalue
if (suffixed.ParenCount > 0)
{
error("Can not assign to parenthesized expression, it is not an lvalue");
}
// more processing needed
List <Expression> lhs = new List <Expression> {
suffixed
};
while (reader.ConsumeSymbol(','))
{
lhs.Add(ParseSuffixedExpr(scope));
}
// equals
if (!reader.ConsumeSymbol('='))
{
error("'=' expected");
}
//rhs
List <Expression> rhs = new List <Expression>();
rhs.Add(ParseExpr(scope));
while (reader.ConsumeSymbol(','))
{
rhs.Add(ParseExpr(scope));
}
AssignmentStatement a = new AssignmentStatement();
a.Lhs = lhs;
a.Rhs = rhs;
stat = a;
}
#if !VANILLA_LUA
else if (isAugmentedAssignment(reader.Peek()))
{
AugmentedAssignmentStatement aas = new AugmentedAssignmentStatement();
Expression left = suffixed;
Expression right = null;
string augmentedOp = reader.Get().Data;
right = ParseExpr(scope);
BinOpExpr nRight = new BinOpExpr();
nRight.Lhs = left;
nRight.Op = augmentedOp.Substring(0, augmentedOp.Length - 1); // strip the '='
nRight.Rhs = right;
aas.Lhs = new List <Expression> {
left
};
aas.Rhs = new List <Expression> {
nRight
};
stat = aas;
}
#endif
else if (suffixed is CallExpr ||
suffixed is TableCallExpr ||
suffixed is StringCallExpr)
{
//it's a call statement
CallStatement c = new CallStatement();
c.Expression = suffixed;
stat = c;
}
else
{
error("assignment statement expected");
}
}
stat.ScannedTokens = reader.Range(startP, reader.p);
if (reader.Peek().Data == ";" && reader.Peek().Type == TokenType.Symbol)
{
stat.HasSemicolon = true;
stat.SemicolonToken = reader.Get();
}
if (stat.Scope == null)
{
stat.Scope = scope;
}
stat.LineNumber = startLine;
return(stat);
}
