/// <summary>
/// Reads a while statement from the input.
/// </summary>
/// <param name="input">Where to read input from.</param>
/// <param name="prev">The token to append what is read into.</param>
/// <returns>The object that was read.</returns>
protected virtual IParseStatement ReadWhile(ITokenizer input, ref Token prev)
{
var debug = input.Read(); // read 'while'
WhileItem w = new WhileItem();
if (debug.Value != "while")
throw new InvalidOperationException(string.Format(Resources.MustBeOn, "while", "ReadWhile"));
// read the expression
w.Exp = ReadExp(input, ref debug);
// read 'do'
var name = Read(input, ref debug);
if (name.Value != "do")
throw new SyntaxException(
string.Format(Resources.TokenInvalidExpecting, name.Value, "while", "do"),
input.Name, name);
// read the block
w.Block = ReadBlock(input, ref debug);
// read 'end'
name = Read(input, ref debug);
if (name.Value != "end")
throw new SyntaxException(
string.Format(Resources.TokenInvalidExpecting, name.Value, "while", "end"),
input.Name, name);
prev.Append(debug);
w.Debug = debug;
return w;
}
/// <summary>
/// Reads a prefix-expression from the input.
/// </summary>
/// <param name="input">Where to read input from.</param>
/// <param name="token">The token to append the total token onto.</param>
/// <returns>The expression that was read.</returns>
protected virtual IParseExp ReadPrefixExp(ITokenizer input, ref Token token)
{
Stack<UnaryInfo> ex = new Stack<UnaryInfo>();
IParseExp o = null;
Token last, debug = input.Peek();
debug.Value = "";
// check for unary operators
last = input.Peek();
while (last.Value == "-" || last.Value == "not" || last.Value == "#")
{
Read(input, ref debug);
if (last.Value == "-")
{
ex.Push(new UnaryInfo(1, last.StartPos, last.StartLine));
}
else if (last.Value == "not")
{
ex.Push(new UnaryInfo(2, last.StartPos, last.StartLine));
}
else
{
Contract.Assert(last.Value == "#");
ex.Push(new UnaryInfo(3, last.StartPos, last.StartLine));
}
last = input.Peek();
}
// check for literals
last = input.Peek();
int over = -1;
if (last.Value != null)
{
NumberFormatInfo ni = CultureInfo.CurrentCulture.NumberFormat;
if (last.Value != "..." && (char.IsNumber(last.Value, 0) || last.Value.StartsWith(ni.NumberDecimalSeparator, StringComparison.CurrentCulture)))
{
Read(input, ref debug); // read the number.
try
{
o = new LiteralItem(double.Parse(last.Value, CultureInfo.CurrentCulture)) { Debug = last };
}
catch (FormatException e)
{
throw new SyntaxException(Resources.BadNumberFormat, input.Name, last, e);
}
}
else if (last.Value.StartsWith("&", StringComparison.Ordinal))
{
Read(input, ref debug);
try
{
o = new LiteralItem(Convert.ToDouble(long.Parse(last.Value.Substring(1),
NumberStyles.AllowHexSpecifier, CultureInfo.CurrentCulture))) { Debug = last };
}
catch (FormatException e)
{
throw new SyntaxException(Resources.BadNumberFormat, input.Name, last, e);
}
}
else if (last.Value.StartsWith("\"", StringComparison.Ordinal))
{
Read(input, ref debug);
o = new LiteralItem(last.Value.Substring(1)) { Debug = last };
}
else if (last.Value.StartsWith("{", StringComparison.Ordinal))
{
o = ReadTable(input, ref debug);
}
else if (last.Value == "(")
{
Read(input, ref debug);
o = ReadExp(input, ref debug);
last = Read(input, ref debug);
if (last.Value != ")")
throw new SyntaxException(string.Format(Resources.TokenInvalidExpecting, last.Value, "expression", ")"),
input.Name, last);
}
else if (last.Value == "true")
{
Read(input, ref debug);
o = new LiteralItem(true) { Debug = last };
}
else if (last.Value == "false")
{
Read(input, ref debug);
o = new LiteralItem(false) { Debug = last };
}
else if (last.Value == "nil")
{
Read(input, ref debug);
o = new LiteralItem(null) { Debug = last };
}
else if (last.Value == "function")
{
o = ReadFunctionHelper(input, ref debug, false, false);
}
else
{
// allow for specifying overloads on global variables
if (last.Value.IndexOf('`') != -1)
{
if (!int.TryParse(last.Value.Substring(last.Value.IndexOf('`') + 1), out over))
throw new InvalidOperationException(Resources.OnlyNumbersInOverload);
last.Value = last.Value.Substring(0, last.Value.IndexOf('`'));
}
Read(input, ref debug);
o = new NameItem(last.Value) { Debug = last };
}
}
// read function calls and indexers
{
string inst = null;
bool cont = true;
while (cont)
{
last = input.Peek();
last.Value = last.Value ?? "";
if (last.Value == ".")
{
Read(input, ref debug);
if (over != -1)
throw new SyntaxException(Resources.FunctionCallAfterOverload, input.Name, last);
if (inst != null)
throw new SyntaxException(Resources.IndexerAfterInstance, input.Name, last);
last = Read(input, ref debug);
// allow for specifying an overload
if (last.Value.IndexOf('`') != -1)
{
if (!int.TryParse(last.Value.Substring(last.Value.IndexOf('`') + 1), out over))
throw new InvalidOperationException(Resources.OnlyNumbersInOverload);
last.Value = last.Value.Substring(0, last.Value.IndexOf('`'));
}
if (!IsName(last.Value))
throw new SyntaxException(string.Format(Resources.TokenNotAName, "indexer", last.Value),
input.Name, last);
if (!(o is IParsePrefixExp))
throw new SyntaxException(Resources.IndexAfterExpression, input.Name, last);
o = new IndexerItem(o, new LiteralItem(last.Value) { Debug = last }) { Debug = debug };
}
else if (last.Value == ":")
{
Read(input, ref debug);
if (over != -1)
throw new SyntaxException(Resources.FunctionCallAfterOverload, input.Name, last);
if (inst != null)
throw new SyntaxException(Resources.OneInstanceCall, input.Name, last);
inst = Read(input, ref debug).Value;
if (!IsName(inst))
throw new SyntaxException(string.Format(Resources.TokenNotAName, "indexer", last.Value),
input.Name, last);
}
else if (last.Value == "[")
{
Read(input, ref debug);
if (over != -1)
throw new SyntaxException(Resources.FunctionCallAfterOverload,
input.Name, last);
if (inst != null)
throw new SyntaxException(Resources.IndexerAfterInstance, input.Name, last);
var temp = ReadExp(input, ref debug);
last = Read(input, ref debug);
o = new IndexerItem(o, temp) { Debug = debug };
if (last.Value != "]")
throw new SyntaxException(
string.Format(Resources.TokenInvalidExpecting, last.Value, "indexer", "]"),
input.Name, last);
}
else if (last.Value.StartsWith("\"", StringComparison.Ordinal))
{
Read(input, ref debug);
FuncCallItem temp = new FuncCallItem(o, inst, over) { Debug = debug };
o = temp;
temp.AddItem(new LiteralItem(last.Value.Substring(1)), false);
inst = null;
over = -1;
}
else if (last.Value == "{")
{
var temp = ReadTable(input, ref debug);
FuncCallItem func = new FuncCallItem(o, inst, over) { Debug = debug };
o = func;
func.AddItem(temp, false);
inst = null;
over = -1;
}
else if (last.Value == "(")
{
Read(input, ref debug);
FuncCallItem func = new FuncCallItem(o, inst, over);
o = func;
inst = null;
over = -1;
while (input.Peek().Value != ")" && input.Peek().Value != null)
{
bool? byRef = null;
if (input.Peek().Value == "@")
{
byRef = false;
Read(input, ref debug);
}
else if (input.Peek().Value == "ref")
{
Read(input, ref debug);
if (input.Peek().Value == "(")
{
Read(input, ref debug);
byRef = true;
}
else
byRef = false;
}
var temp = ReadExp(input, ref debug);
if (byRef != null && !(temp is NameItem) && !(temp is IndexerItem))
throw new SyntaxException(Resources.OnlyVarByReference, input.Name, last);
if (temp == null)
throw new SyntaxException(string.Format(Resources.InvalidDefinition, "function call"),
input.Name, last);
func.AddItem(temp, byRef != null);
if (byRef == true && (last = input.Read()).Value != ")")
throw new SyntaxException(Resources.RefOneArgument,
input.Name, last);
if (input.Peek().Value == ",")
Read(input, ref debug);
else if (input.Peek().Value == ")")
break;
else
throw new SyntaxException(string.Format(Resources.TokenInvalidExpecting2, input.Peek().Value, "function call", ",", ")"), input.Name, last);
}
if (input.Peek() == null)
throw new SyntaxException(string.Format(Resources.UnexpectedEOF, "function call"),
input.Name, last);
Read(input, ref debug);
func.Debug = debug;
}
else
{
if (inst != null)
throw new SyntaxException(Resources.InstanceMissingArgs, input.Name, last);
if (over != -1)
throw new SyntaxException(Resources.OverloadMissingArgs, input.Name, last);
cont = false;
}
}
}
// read exponents
// HACK: This is needed here because the power operator has
// higher precedence than the unary operators. Rather than
// have unary operators handled in ReadExp, they are handled
// so exponents need to be handled before we apply the
// unary operators.
if (input.Peek().Value == "^")
{
Read(input, ref debug);
var temp = ReadPrefixExp(input, ref debug);
BinOpItem item = new BinOpItem(o, BinaryOperationType.Power, temp) { Debug = debug };
o = item;
}
// now apply the unary operators
while (ex.Count > 0)
{
var loc = ex.Pop();
Token tok = new Token(debug.Value, loc.StartPos, debug.EndPos, loc.StartLine, debug.EndLine);
switch (loc.Version)
{
case 1: // neg
if (o is LiteralItem)
{
object oo = (o as LiteralItem).Value;
if (!(oo is double))
throw new SyntaxException(Resources.InvalidUnary,
input.Name, debug);
o = new LiteralItem(-(double)oo) { Debug = tok };
}
else
o = new UnOpItem(o, UnaryOperationType.Minus) { Debug = tok };
break;
case 2: // not
o = new UnOpItem(o, UnaryOperationType.Not) { Debug = tok };
break;
case 3: // len
o = new UnOpItem(o, UnaryOperationType.Length) { Debug = tok };
break;
}
}
// finaly return
token.Append(debug);
return o;
}
/// <summary>
/// Reads a goto statement from the input.
/// </summary>
/// <param name="input">Where to read input from.</param>
/// <param name="prev">The token to append what is read into.</param>
/// <returns>The object that was read.</returns>
protected virtual IParseStatement ReadGoto(ITokenizer input, ref Token prev)
{
var debug = input.Read(); // read 'goto'
if (debug.Value != "goto")
throw new InvalidOperationException(string.Format(Resources.MustBeOn, "goto", "ReadGoto"));
// read the target
var name = Read(input, ref debug);
if (!IsName(name.Value))
throw new SyntaxException(
string.Format(Resources.TokenNotAName, "goto", name.Value),
input.Name, debug);
if (_reserved.Contains(name.Value))
throw new SyntaxException(
string.Format(Resources.TokenReserved, name.Value),
input.Name, name);
prev.Append(debug);
return new GotoItem(name.Value) { Debug = debug };
}
/// <summary>
/// Reads a do statement from the input.
/// </summary>
/// <param name="input">Where to read input from.</param>
/// <param name="prev">The token to append what is read into.</param>
/// <returns>The object that was read.</returns>
protected virtual IParseStatement ReadDo(ITokenizer input, ref Token prev)
{
var debug = input.Read(); // read 'do'
if (debug.Value != "do")
throw new InvalidOperationException(string.Format(Resources.MustBeOn, "do", "ReadDo"));
// read the block
var ret = ReadBlock(input, ref debug);
// ensure that it ends with 'end'
Token end = Read(input, ref debug);
if (end.Value != "end")
throw new SyntaxException(
string.Format(Resources.TokenInvalidExpecting, end.Value, "do", "end"),
input.Name, end);
prev.Append(debug);
return ret;
}
/// <summary>
/// Reads a label statement from the input.
/// </summary>
/// <param name="input">Where to read input from.</param>
/// <param name="prev">The token to append what is read into.</param>
/// <returns>The object that was read.</returns>
protected virtual IParseStatement ReadLabel(ITokenizer input, ref Token prev)
{
var debug = input.Read(); // read '::'
if (debug.Value != "::")
throw new InvalidOperationException(string.Format(Resources.MustBeOn, "::", "ReadLabel"));
// read the label
Token label = Read(input, ref debug);
// read '::'
var name = Read(input, ref debug);
if (name.Value != "::")
throw new SyntaxException(
string.Format(Resources.TokenInvalidExpecting, name.Value, "label", "::"),
input.Name, debug);
prev.Append(debug);
return new LabelItem(label.Value) { Debug = debug };
}
/// <summary>
/// Reads a break statement from the input.
/// </summary>
/// <param name="input">Where to read input from.</param>
/// <param name="prev">The token to append what is read into.</param>
/// <returns>The object that was read.</returns>
protected virtual IParseStatement ReadBreak(ITokenizer input, ref Token prev)
{
var ret = input.Read();
if (ret.Value != "break")
throw new InvalidOperationException(string.Format(Resources.MustBeOn, "break", "ReadBreak"));
prev.Append(ret);
return new GotoItem("<break>") { Debug = ret };
}
/// <summary>
/// Reads an if statement from the input.
/// </summary>
/// <param name="input">Where to read input from.</param>
/// <param name="prev">The token to append what is read into.</param>
/// <returns>The object that was read.</returns>
protected virtual IParseStatement ReadIf(ITokenizer input, ref Token prev)
{
var debug = input.Read(); // read 'if'
IfItem i = new IfItem();
if (debug.Value != "if")
throw new InvalidOperationException(string.Format(Resources.MustBeOn, "if", "ReadIf"));
// read the initial expression
i.Exp = ReadExp(input, ref debug);
// read 'then'
var name = Read(input, ref debug);
if (name.Value != "then")
throw new SyntaxException(
string.Format(Resources.TokenInvalid, name.Value, "if"),
input.Name, debug);
// read the block
var readBlock = ReadBlock(input, ref debug);
i.Block = readBlock;
// handle elseif(s)
while ((name = input.Peek()).Value == "elseif")
{
Read(input, ref debug); // read 'elseif'
// read the expression
var readExp = ReadExp(input, ref debug);
// read 'then'
name = Read(input, ref debug);
if (name.Value != "then")
throw new SyntaxException(
string.Format(Resources.TokenInvalid, name.Value, "elseif"),
input.Name, debug);
// read the block
readBlock = ReadBlock(input, ref debug);
i.AddElse(readExp, readBlock);
}
// handle else
if (name.Value != "else" && name.Value != "end")
throw new SyntaxException(
string.Format(Resources.TokenInvalid, name.Value, "if"),
input.Name, debug);
if (name.Value == "else")
{
Read(input, ref debug); // read 'else'
// read the block
readBlock = ReadBlock(input, ref debug);
i.ElseBlock = readBlock;
}
// read 'end'
name = Read(input, ref debug);
if (name.Value != "end")
throw new SyntaxException(
string.Format(Resources.TokenInvalid, name.Value, "if"),
input.Name, debug);
prev.Append(debug);
i.Debug = debug;
return i;
}
/// <summary>
/// Reads a repeat statement from the input.
/// </summary>
/// <param name="input">Where to read input from.</param>
/// <param name="prev">The token to append what is read into.</param>
/// <returns>The object that was read.</returns>
protected virtual IParseStatement ReadRepeat(ITokenizer input, ref Token prev)
{
var debug = input.Read(); // read 'repeat'
RepeatItem repeat = new RepeatItem();
if (debug.Value != "repeat")
throw new InvalidOperationException(string.Format(Resources.MustBeOn, "repeat", "ReadRepeat"));
// read the block
repeat.Block = ReadBlock(input, ref debug);
// read 'until'
var name = Read(input, ref debug);
if (name.Value != "until")
throw new SyntaxException(
string.Format(Resources.TokenInvalidExpecting, name.Value, "repeat", "until"),
input.Name, name);
// read the expression
repeat.Expression = ReadExp(input, ref debug);
prev.Append(debug);
repeat.Debug = debug;
return repeat;
}
/// <summary>
/// Reads a return statement from the input.
/// </summary>
/// <param name="input">Where to read input from.</param>
/// <param name="prev">The token to append what is read into.</param>
/// <returns>The object that was read.</returns>
protected virtual ReturnItem ReadReturn(ITokenizer input, ref Token prev)
{
var debug = input.Read(); // read 'return'
ReturnItem r = new ReturnItem();
if (debug.Value != "return")
throw new InvalidOperationException(string.Format(Resources.MustBeOn, "return", "ReadReturn"));
var name = input.Peek();
if (name.Value != "end" && name.Value != "until" && name.Value != "elseif" &&
name.Value != "else")
{
r.AddExpression(ReadExp(input, ref debug));
while (input.Peek().Value == ",")
{
Read(input, ref debug); // read ','
r.AddExpression(ReadExp(input, ref debug));
}
if (input.Peek().Value == ";")
{
Read(input, ref debug); // read ';'
}
// look at the next token for validation but keep it in the
// reader for the parrent.
name = input.Peek();
if (name.Value != "end" && name.Value != "until" && name.Value != "elseif" &&
name.Value != "else" && !IsNullOrWhiteSpace(name.Value))
throw new SyntaxException(
Resources.ReturnAtEnd,
input.Name, debug);
}
prev.Append(debug);
r.Debug = debug;
return r;
}
/// <summary>
/// Reads a for statement from the input.
/// </summary>
/// <param name="input">Where to read input from.</param>
/// <param name="prev">The token to append what is read into.</param>
/// <returns>The object that was read.</returns>
protected virtual IParseStatement ReadFor(ITokenizer input, ref Token prev)
{
var debug = input.Read(); // read 'for'
if (debug.Value != "for")
throw new InvalidOperationException(string.Format(Resources.MustBeOn, "for", "ReadFor"));
// read a name
var name = Read(input, ref debug);
if (!IsName(name.Value))
throw new SyntaxException(
string.Format(Resources.TokenNotAName, "for", name.Value),
input.Name, name);
if (_reserved.Contains(name.Value))
throw new SyntaxException(
string.Format(Resources.TokenReserved, name.Value),
input.Name, name);
// numeric for
if (input.Peek().Value == "=")
{
var ret = ReadNumberFor(input, ref debug, name);
prev.Append(debug);
return ret;
}
// generic for statement
else
{
var ret = ReadGenericFor(input, ref debug, name);
prev.Append(debug);
return ret;
}
}
/// <summary>
/// Reads a class statement from the input.
/// </summary>
/// <param name="input">Where to read input from.</param>
/// <param name="prev">The token to append what is read into.</param>
/// <returns>The object that was read.</returns>
protected virtual IParseStatement ReadClass(ITokenizer input, ref Token prev)
{
var debug = input.Read(); // read 'class'
string sname = null;
List<string> imp = new List<string>();
if (debug.Value != "class")
throw new InvalidOperationException(string.Format(Resources.MustBeOn, "class", "ReadClass"));
if (input.Peek().Value.StartsWith("'", StringComparison.Ordinal) ||
input.Peek().Value.StartsWith("\"", StringComparison.Ordinal))
{
var name = Read(input, ref debug);
sname = name.Value.Substring(1);
if (input.Peek().Value == "(")
{
Read(input, ref debug); // read '('
while (input.Peek().Value != ")")
{
// read the name
name = Read(input, ref debug);
if (!IsName(name.Value))
throw new SyntaxException(
string.Format(Resources.TokenNotAName, "class", name.Value),
input.Name, name);
imp.Add(name.Value);
// read ','
name = Read(input, ref debug);
if (name.Value != ",")
throw new SyntaxException(
string.Format(Resources.TokenInvalid, name.Value, "class"),
input.Name, name);
}
Read(input, ref debug); // read ')'
}
}
else
{
var name = Read(input, ref debug);
sname = name.Value;
if (!IsName(sname))
throw new SyntaxException(
string.Format(Resources.TokenNotAName, "class", name.Value),
input.Name, name);
if (input.Peek().Value == ":")
{
do
{
// simply include the '.' in the name.
string n = "";
do
{
Read(input, ref debug); // read ':' or ','
n += (n == "" ? "" : ".") + Read(input, ref debug).Value;
} while (input.Peek().Value == ".");
imp.Add(n);
} while (input.Peek().Value == ",");
}
}
prev.Append(debug);
return new ClassDefItem(sname, imp.ToArray()) { Debug = debug };
}
/// <summary>
/// Reads a local statement from the input.
/// </summary>
/// <param name="input">Where to read input from.</param>
/// <param name="prev">The token to append what is read into.</param>
/// <returns>The object that was read.</returns>
protected virtual IParseStatement ReadLocal(ITokenizer input, ref Token prev)
{
var debug = input.Read(); // read 'local'
if (debug.Value != "local")
throw new InvalidOperationException(string.Format(Resources.MustBeOn, "local", "ReadLocal"));
var name = input.Peek();
if (name.Value == "function")
{
prev.Append(debug);
return ReadFunctionHelper(input, ref prev, true, true);
}
else
{
Read(input, ref debug); // read name
if (!IsName(name.Value))
throw new SyntaxException(
string.Format(Resources.TokenNotAName, "local", name.Value),
input.Name, name);
if (_reserved.Contains(name.Value))
throw new SyntaxException(
string.Format(Resources.TokenReserved, name.Value),
input.Name, name);
var i = ReadAssignment(input, ref debug, true, new NameItem(name.Value) { Debug = name });
prev.Append(debug);
return i;
}
}
/// <summary>
/// Reads a token from the tokenizer and appends the read
/// value to the given token.
/// </summary>
/// <param name="input">Where to get the input from.</param>
/// <param name="token">A token to append the read token to.</param>
/// <returns>The token that was read.</returns>
protected static Token Read(ITokenizer input, ref Token token)
{
Token ret = input.Read();
token.Append(ret);
return ret;
}
/// <summary>
/// Reads a table from the input. Input must be either on the starting '{'.
/// </summary>
/// <param name="input">Where to read input from.</param>
/// <param name="token">The token to append the read Tokenm to.</param>
/// <returns>The table that was read.</returns>
protected virtual TableItem ReadTable(ITokenizer input, ref Token token)
{
Token debug = input.Read();
if (debug.Value != "{")
throw new SyntaxException(
string.Format(Resources.TokenInvalidExpecting, debug.Value, "table", "{"),
input.Name, debug);
TableItem ret = new TableItem();
Token last = input.Peek();
while (last.Value != "}")
{
if (last.Value == "[")
{
Read(input, ref debug); // read the "["
var temp = ReadExp(input, ref debug);
if (temp == null)
throw new SyntaxException(string.Format(Resources.InvalidDefinition, "table"),
input.Name, debug);
// read ']'
last = Read(input, ref debug);
if (last.Value != "]")
throw new SyntaxException(
string.Format(Resources.TokenInvalidExpecting, last.Value, "table", "]"),
input.Name, last);
// read '='
last = Read(input, ref debug);
if (last.Value != "=")
throw new SyntaxException(
string.Format(Resources.TokenInvalidExpecting, last.Value, "table", "="),
input.Name, last);
// read the expression
var val = ReadExp(input, ref debug);
if (val == null)
throw new SyntaxException(string.Format(Resources.InvalidDefinition, "table"),
input.Name, debug);
ret.AddItem(temp, val);
}
else
{
var val = ReadExp(input, ref debug);
if (input.Peek().Value == "=")
{
Read(input, ref debug); // read '='
NameItem name = val as NameItem;
if (name == null)
throw new SyntaxException(string.Format(Resources.InvalidDefinition, "table"),
input.Name, debug);
// read the expression
var exp = ReadExp(input, ref debug);
ret.AddItem(new LiteralItem(name.Name), exp);
}
else
{
ret.AddItem(null, val);
}
}
if (input.Peek().Value != "," && input.Peek().Value != ";")
break;
else
Read(input, ref debug);
last = input.Peek();
} // end While
Token end = Read(input, ref debug); // read the "}"
if (end.Value != "}")
throw new SyntaxException(
string.Format(Resources.TokenInvalidExpecting, end.Value, "table", "}"),
input.Name, end);
ret.Debug = debug;
token.Append(debug);
return ret;
}
/// <summary>
/// Reads a function from the input. Input must either be on the word 'function' or
/// on the next token. If it is on 'function' and canName is true, it will give
/// the function the read name; otherwise it will give it a null name.
/// </summary>
/// <param name="input">Where to read input from.</param>
/// <param name="token">The token to append the read Token to.</param>
/// <param name="canName">True if the function can have a name, otherwise false.</param>
/// <param name="local">True if this function is a local definition, otherwise false.</param>
/// <returns>The function definition that was read.</returns>
protected virtual FuncDefItem ReadFunctionHelper(ITokenizer input, ref Token token, bool canName, bool local)
{
IParseVariable name = null;
string inst = null;
Token last = input.Peek(), debug = last;
if (last.Value == "function")
{
input.Read(); // read 'function'
last = input.Peek();
if (IsName(last.Value))
{
Token nameTok = input.Read(); // read name
name = new NameItem(last.Value) { Debug = last };
// handle indexers
last = input.Peek();
while (last.Value == ".")
{
Read(input, ref nameTok); // read '.'
last = input.Peek();
if (!IsName(last.Value))
break;
name = new IndexerItem(name, new LiteralItem(last.Value) { Debug = last }) { Debug = nameTok };
Read(input, ref nameTok);
}
if (input.Peek().Value == ":")
{
Read(input, ref nameTok);
inst = Read(input, ref nameTok).Value;
if (!IsName(inst))
throw new SyntaxException(string.Format(Resources.TokenInvalid, last.Value, "function"),
input.Name, last);
}
debug.Append(nameTok);
}
}
if (name != null && !canName)
throw new SyntaxException(Resources.FunctionCantHaveName, input.Name, debug);
FuncDefItem ret = new FuncDefItem(name, local);
ret.InstanceName = inst;
last = Read(input, ref debug);
if (last.Value != "(")
throw new SyntaxException(
string.Format(Resources.TokenInvalidExpecting, last.Value, "function", "("),
input.Name, last);
last = input.Peek();
while (last.Value != ")")
{
Token temp = Read(input, ref debug); // read the name
if (!IsName(last.Value) && last.Value != "...")
throw new SyntaxException(string.Format(Resources.TokenInvalid, last.Value, "function"),
input.Name, temp);
ret.AddArgument(new NameItem(last.Value) { Debug = last });
last = input.Peek();
if (last.Value == ",")
Read(input, ref debug);
else if (last.Value != ")")
throw new SyntaxException(
string.Format(Resources.TokenInvalidExpecting2, last.Value, "function", ",", ")"),
input.Name, last);
last = input.Peek();
}
if (last.Value != ")")
throw new SyntaxException(
string.Format(Resources.TokenInvalidExpecting, last.Value, "function", ")"),
input.Name, last);
Read(input, ref debug); // read ')'
BlockItem chunk = ReadBlock(input, ref debug);
chunk.Return = chunk.Return ?? new ReturnItem();
ret.Block = chunk;
last = Read(input, ref debug);
if (last.Value != "end")
throw new SyntaxException(
string.Format(Resources.TokenInvalidExpecting, last.Value, "function", "end"),
input.Name, last);
token.Append(debug);
ret.Debug = debug;
return ret;
}