private void CompileListSlice(Parser parser, ByteBuffer buffer, ListSlice listSlice, bool outputUsed)
{
EnsureUsed(listSlice.FirstToken, outputUsed);
this.CompileExpression(parser, buffer, listSlice.Root, true);
Expression step = listSlice.Items[2];
bool isStep1 = step is IntegerConstant && ((IntegerConstant)step).Value == 1;
int serializeThese = isStep1 ? 2 : 3;
for (int i = 0; i < serializeThese; ++i)
{
Expression item = listSlice.Items[i];
if (item != null)
{
this.CompileExpression(parser, buffer, item, true);
}
}
bool firstIsPresent = listSlice.Items[0] != null;
bool secondIsPresent = listSlice.Items[1] != null;
buffer.Add(listSlice.BracketToken, OpCode.LIST_SLICE, new int[] { firstIsPresent ? 1 : 0, secondIsPresent ? 1 : 0, isStep1 ? 0 : 1 });
}
private static Expression ParseEntity(TokenStream tokens, Executable owner)
{
Expression root;
if (tokens.PopIfPresent("("))
{
root = Parse(tokens, owner);
tokens.PopExpected(")");
}
else
{
root = ParseEntityWithoutSuffixChain(tokens, owner);
}
bool anySuffixes = true;
while (anySuffixes)
{
if (tokens.IsNext("."))
{
Token dotToken = tokens.Pop();
Token stepToken = tokens.Pop();
Parser.VerifyIdentifier(stepToken);
root = new DotStep(root, dotToken, stepToken, owner);
}
else if (tokens.IsNext("["))
{
Token openBracket = tokens.Pop();
List<Expression> sliceComponents = new List<Expression>();
if (tokens.IsNext(":"))
{
sliceComponents.Add(null);
}
else
{
sliceComponents.Add(Parse(tokens, owner));
}
for (int i = 0; i < 2; ++i)
{
if (tokens.PopIfPresent(":"))
{
if (tokens.IsNext(":") || tokens.IsNext("]"))
{
sliceComponents.Add(null);
}
else
{
sliceComponents.Add(Parse(tokens, owner));
}
}
}
tokens.PopExpected("]");
if (sliceComponents.Count == 1)
{
Expression index = sliceComponents[0];
root = new BracketIndex(root, openBracket, index, owner);
}
else
{
root = new ListSlice(root, sliceComponents, openBracket, owner);
}
}
else if (tokens.IsNext("("))
{
Token openParen = tokens.Pop();
List<Expression> args = new List<Expression>();
while (!tokens.PopIfPresent(")"))
{
if (args.Count > 0)
{
tokens.PopExpected(",");
}
args.Add(Parse(tokens, owner));
}
root = new FunctionCall(root, openParen, args, owner);
}
else
{
anySuffixes = false;
}
}
return root;
}
