static void addMacro(ast.Statement stmt, Object.Environment env)
{
ast.LetStatement letStatement = (ast.LetStatement)stmt;
ast.MacroLiteral macroLiteral = (ast.MacroLiteral)letStatement.Value;
Object.Macro macro = new Object.Macro
{
Parameters = macroLiteral.Parameters,
Env = env,
Body = macroLiteral.Body
};
env.Set(letStatement.Name.Value, macro);
}
static bool isMacroDefenition(ast.Statement node)
{
if (!(node is ast.LetStatement))
{
return(false);
}
ast.LetStatement letStatement = (ast.LetStatement)node;
if (!(letStatement.Value is ast.MacroLiteral))
{
return(false);
}
return(true);
}
static ast.LetStatement parseLetStatement()
{
ast.LetStatement stmt = new ast.LetStatement {
Token = curToken
};
if (!expectPeek(token.IDENT))
{
return(null);
}
stmt.Name = new ast.Identifier {
Token = curToken, Value = curToken.Literal
};
if (!expectPeek(token.ASSIGN))
{
return(null);
}
nextToken();
stmt.Value = parseExpression(LOWEST);
if (stmt.Value is ast.FunctionLiteral)
{
ast.FunctionLiteral fl = (ast.FunctionLiteral)stmt.Value;
fl.Name = stmt.Name.Value;
stmt.Value = fl;
}
if (peekTokenIs(token.SEMICOLON))
{
nextToken();
}
return(stmt);
}
public static ast.Node Modify(ast.Node node, MofifierFunc modifier)
{
if (node is ast.Program)
{
ast.Program _node = (ast.Program)node;
for (int i = 0; i < _node.Statements.Count; i++)
{
_node.Statements[i] = (ast.Statement)Modify(_node.Statements[i], modifier);
}
node = _node;
}
if (node is ast.ExpressionStatement)
{
ast.ExpressionStatement _node = (ast.ExpressionStatement)node;
_node.Expression = (ast.Expression)Modify(_node.Expression, modifier);
node = _node;
}
if (node is ast.InfixExpression)
{
ast.InfixExpression _node = (ast.InfixExpression)node;
_node.Left = (ast.Expression)Modify(_node.Left, modifier);
_node.Right = (ast.Expression)Modify(_node.Right, modifier);
node = _node;
}
if (node is ast.PrefixExpression)
{
ast.PrefixExpression _node = (ast.PrefixExpression)node;
_node.Right = (ast.Expression)Modify(_node.Right, modifier);
node = _node;
}
if (node is ast.IndexExpression)
{
ast.IndexExpression _node = (ast.IndexExpression)node;
_node.Left = (ast.Expression)Modify(_node.Left, modifier);
_node.Index = (ast.Expression)Modify(_node.Index, modifier);
node = _node;
}
if (node is ast.IfExpression)
{
ast.IfExpression _node = (ast.IfExpression)node;
_node.Condition = (ast.Expression)Modify(_node.Condition, modifier);
_node.Consequence = (ast.BlockStatement)Modify(_node.Consequence, modifier);
node = _node;
if (_node.Alternative != null)
{
_node.Alternative = (ast.BlockStatement)Modify(_node.Alternative, modifier);
}
}
if (node is ast.BlockStatement)
{
ast.BlockStatement _node = (ast.BlockStatement)node;
for (int i = 0; i < _node.Statements.Count; i++)
{
_node.Statements[i] = (ast.Statement)Modify(_node.Statements[i], modifier);
}
node = _node;
}
if (node is ast.ReturnStatement)
{
ast.ReturnStatement _node = (ast.ReturnStatement)node;
_node.ReturnValue = (ast.Expression)Modify(_node.ReturnValue, modifier);
node = _node;
}
if (node is ast.LetStatement)
{
ast.LetStatement _node = (ast.LetStatement)node;
_node.Value = (ast.Expression)Modify(_node.Value, modifier);
node = _node;
}
if (node is ast.FunctionLiteral)
{
ast.FunctionLiteral _node = (ast.FunctionLiteral)node;
for (int i = 0; i < _node.Parameters.Count; i++)
{
_node.Parameters[i] = (ast.Identifier)Modify(_node.Parameters[i], modifier);
}
_node.Body = (ast.BlockStatement)Modify(_node.Body, modifier);
node = _node;
}
if (node is ast.ArrayLiteral)
{
ast.ArrayLiteral _node = (ast.ArrayLiteral)node;
for (int i = 0; i < _node.Elements.Count; i++)
{
_node.Elements[i] = (ast.Expression)Modify(_node.Elements[i], modifier);
}
node = _node;
}
if (node is ast.HashLiteral)
{
ast.HashLiteral _node = (ast.HashLiteral)node;
Dictionary <ast.Expression, ast.Expression> newPairs = new Dictionary <ast.Expression, ast.Expression>();
foreach (KeyValuePair <ast.Expression, ast.Expression> kv in _node.Pairs)
{
ast.Expression newKey = (ast.Expression)Modify(kv.Key, modifier);
ast.Expression newVal = (ast.Expression)Modify(kv.Value, modifier);
newPairs.Add(newKey, newVal);
}
_node.Pairs = newPairs;
node = _node;
}
return(modifier(node));
}