// A map literal.
private static void Map(Compiler c, bool allowAssignment)
{
// Load the Map class.
int mapClassSymbol = c._parser.Module.Variables.FindIndex(v => v.Name == "Map");
c.EmitShortArg(Instruction.LoadModuleVar, mapClassSymbol);
// Instantiate a new map.
c.CallMethod(0, "<instantiate>");
// Compile the map elements. Each one is compiled to just invoke the
// subscript setter on the map.
if (c.Peek() != TokenType.RightBrace)
{
do
{
c.IgnoreNewlines();
// Push a copy of the map since the subscript call will consume it.
c.Emit(Instruction.Dup);
// The key.
c.ParsePrecedence(false, Precedence.Primary);
c.Consume(TokenType.Colon, "Expect ':' after map key.");
// The value.
c.Expression();
c.CallMethod(2, "[_]=(_)");
// Discard the result of the setter call.
c.Emit(Instruction.Pop);
} while (c.Match(TokenType.Comma));
}
// Allow newlines before the closing '}'.
c.IgnoreNewlines();
c.Consume(TokenType.RightBrace, "Expect '}' after map entries.");
}
// A list literal.
private static void List(Compiler c, bool allowAssignment)
{
// Load the List class.
int listClassSymbol = c._parser.Module.Variables.FindIndex(v => v.Name == "List");
//ASSERT(listClassSymbol != -1, "Should have already defined 'List' variable.");
c.EmitShortArg(Instruction.LoadModuleVar, listClassSymbol);
// Instantiate a new list.
c.CallMethod(0, "<instantiate>");
// Compile the list elements. Each one compiles to a ".add()" call.
if (c.Peek() != TokenType.RightBracket)
{
do
{
c.IgnoreNewlines();
// Push a copy of the list since the add() call will consume it.
c.Emit(Instruction.Dup);
// The element.
c.Expression();
c.CallMethod(1, "add(_)");
// Discard the result of the add() call.
c.Emit(Instruction.Pop);
} while (c.Match(TokenType.Comma));
}
// Allow newlines before the closing ']'.
c.IgnoreNewlines();
c.Consume(TokenType.RightBracket, "Expect ']' after list elements.");
}
private static void Boolean(Compiler c, bool allowAssignment)
{
c.Emit(c._parser.Previous.Type == TokenType.False ? Instruction.False : Instruction.True);
}
public static ObjFn Compile(SophieVM vm, ObjModule module, string sourcePath, string source, bool printErrors)
{
Parser parser = new Parser
{
Vm = vm,
Module = module,
SourcePath = sourcePath,
Source = source,
TokenStart = 0,
CurrentChar = 0,
CurrentLine = 1,
Current = { Type = TokenType.Error, Start = 0, Length = 0, Line = 0 },
PrintErrors = printErrors,
HasError = false,
Raw = ""
};
Compiler compiler = new Compiler(parser, null, true);
// Read the first token.
compiler.NextToken();
compiler.IgnoreNewlines();
while (!compiler.Match(TokenType.Eof))
{
compiler.Definition();
// If there is no newline, it must be the end of the block on the same line.
if (!compiler.MatchLine())
{
compiler.Consume(TokenType.Eof, "Expect end of file.");
break;
}
}
compiler.Emit(Instruction.Null);
compiler.Emit(Instruction.Return);
// See if there are any implicitly declared module-level variables that never
// got an explicit definition.
// TODO: It would be nice if the error was on the line where it was used.
for (int i = 0; i < parser.Module.Variables.Count; i++)
{
ModuleVariable t = parser.Module.Variables[i];
if (t.Container == Obj.Undefined)
{
compiler.Error(string.Format("Variable '{0}' is used but not defined.", t.Name));
}
}
return compiler.EndCompiler();
}
private static void Number(Compiler c, bool allowAssignment)
{
if (c._parser.Number == 0.0)
{
c.Emit(Instruction.Zero);
return;
}
if (c._parser.Number == 1.0)
{
c.Emit(Instruction.One);
return;
}
int constant = c.AddConstant(new Obj(c._parser.Number));
// Compile the code to load the constant.
c.EmitConstant(constant);
}
private static void null_(Compiler c, bool allowAssignment)
{
c.Emit(Instruction.Null);
}
