public static Object Read(TextReader textReader, ReadTable readTable, object eofValue)
{
int c = textReader.Read();
if (c == -1)
{
// End of file
return(EOFVALUE);
}
while (Char.IsWhiteSpace((Char)c))
{
c = textReader.Read();
}
Object f = readTable.GetMacroCharacter(c);
if (f != null)
{
return(((ReaderMacro)f)(textReader, readTable));
}
else
{
return(AtomReader(c, textReader));
}
}
public static Object BackQuoteReader(params Object[] args)
{
TextReader textReader = (TextReader)args[0];
ReadTable readTable = (ReadTable)args[1];
return(new Cons(Symbol.FromName("backquote"), new Cons(Read(textReader, readTable, null), null)));
}
public static object ReadString(string expression, Environment environment)
{
ReadTable readTable = (ReadTable)environment.GetValue(Symbol.FromName("*readtable*"));
object input = Reader.Read(new StringReader(expression), readTable);
return(input);
}
public static Object ReadString(Cons args, Environment environment)
{
ReadTable readTable = (ReadTable)environment.GetValue(Symbol.FromName("*readtable*"));
TextReader textReader = new StringReader((string)args.First());
return(Reader.Read(textReader, readTable));
}
public static Object CharacterReader(params Object[] args)
{
TextReader textReader = (TextReader)args[0];
ReadTable readTable = (ReadTable)args[1];
int c;
c = textReader.Read();
return((char)c);
}
public static Object UnQuoteReader(params Object[] args)
{
TextReader textReader = (TextReader)args[0];
ReadTable readTable = (ReadTable)args[1];
if (textReader.Peek() == '@')
{
textReader.Read();
return(new Cons(Symbol.FromName("splice"), new Cons(Read(textReader, readTable, null), null)));
}
return(new Cons(Symbol.FromName("unquote"), new Cons(Read(textReader, readTable, null), null)));
}
public static Object LineCommentReader(params Object[] args)
{
TextReader textReader = (TextReader)args[0];
ReadTable readTable = (ReadTable)args[1];
int c;
do
{
c = textReader.Read();
} while (c != -1 && c != '\n' && c != '\r');
return(Read(textReader, readTable, null));
}
public static Object Read(Cons args, Environment environment)
{
ReadTable readTable = (ReadTable)environment.GetValue(Symbol.FromName("*readtable*"));
TextReader textReader = args.First() as TextReader;
object eofValue = Reader.EOFVALUE;
if (args.Length() > 1)
{
eofValue = args.Second();
}
return(Reader.Read(textReader, readTable, eofValue));
}
public static ReadTable DefaultReadTable()
{
ReadTable readTable = new ReadTable();
readTable.SetMacroCharacter('(',new ReaderMacro(Reader.LParReader));
readTable.SetMacroCharacter('\"',new ReaderMacro(Reader.StringReader));
readTable.SetMacroCharacter(';',new ReaderMacro(Reader.LineCommentReader));
readTable.SetMacroCharacter('#',new ReaderMacro(Reader.DispatchReader));
readTable.SetMacroCharacter('\'',new ReaderMacro(Reader.QuoteReader));
readTable.SetMacroCharacter('`',new ReaderMacro(Reader.BackQuoteReader));
readTable.SetMacroCharacter(',',new ReaderMacro(Reader.UnQuoteReader));
readTable.SetDispatchCharacter('|',new ReaderMacro(Reader.MultiLineCommentReader));
readTable.SetDispatchCharacter('\\',new ReaderMacro(Reader.CharacterReader));
return readTable;
}
public static ReadTable DefaultReadTable()
{
ReadTable readTable = new ReadTable();
readTable.SetMacroCharacter('(', new ReaderMacro(Reader.LParReader));
readTable.SetMacroCharacter('\"', new ReaderMacro(Reader.StringReader));
readTable.SetMacroCharacter(';', new ReaderMacro(Reader.LineCommentReader));
readTable.SetMacroCharacter('#', new ReaderMacro(Reader.DispatchReader));
readTable.SetMacroCharacter('\'', new ReaderMacro(Reader.QuoteReader));
readTable.SetMacroCharacter('`', new ReaderMacro(Reader.BackQuoteReader));
readTable.SetMacroCharacter(',', new ReaderMacro(Reader.UnQuoteReader));
readTable.SetDispatchCharacter('|', new ReaderMacro(Reader.MultiLineCommentReader));
readTable.SetDispatchCharacter('\\', new ReaderMacro(Reader.CharacterReader));
return(readTable);
}
public static Object DispatchReader(params Object[] args)
{
TextReader textReader = (TextReader)args[0];
ReadTable readTable = (ReadTable)args[1];
int c = textReader.Read();
Object f = readTable.GetDispatchCharacter(c);
if (f != null)
{
return(((ReaderMacro)f)(textReader, readTable));
}
else
{
return(AtomReader(c, textReader));
}
}
public static ReadTable DefaultReadTable()
{
ReadTable readTable = new ReadTable();
readTable.SetMacroCharacter('(',new ReaderMacro(Reader.LParReader));
readTable.SetMacroCharacter('\"',new ReaderMacro(Reader.StringReader));
readTable.SetMacroCharacter(';',new ReaderMacro(Reader.LineCommentReader));
readTable.SetMacroCharacter('#',new ReaderMacro(Reader.DispatchReader));
readTable.SetMacroCharacter('\'',new ReaderMacro(Reader.QuoteReader));
readTable.SetMacroCharacter('`',new ReaderMacro(Reader.BackQuoteReader));
readTable.SetMacroCharacter(',',new ReaderMacro(Reader.UnQuoteReader));
readTable.SetDispatchCharacter('|',new ReaderMacro(Reader.MultiLineCommentReader));
readTable.SetDispatchCharacter('\\',new ReaderMacro(Reader.CharacterReader));
readTable.SetMacroCharacter('~', new ReaderMacro(Reader.AssemblyDefinitionReader));
// example: ~namespace=LSharp.ExampleClass1~
return readTable;
}
public static Object LParReader(params Object[] args)
{
TextReader textReader = (TextReader)args[0];
ReadTable readTable = (ReadTable)args[1];
int c;
while (Char.IsWhiteSpace((Char)textReader.Peek()))
{
c = textReader.Read();
}
object o = Read(textReader, readTable, null);
if (recdepth < RECURSEDEPTH)
{
if (o as Symbol != (Symbol)")")
{
try
{
recdepth++;
if (recdepth > maxdepth)
{
maxdepth = recdepth;
}
return(new Cons(o, LParReader(textReader, readTable)));
}
finally
{
recdepth--;
}
}
}
else
{
System.Diagnostics.Trace.WriteLine("Recursion depth reached: " + recdepth);
}
return(null);
}
public static Object Load(Cons args, Environment environment)
{
object filename = args.First();
if (filename is string)
{
TextReader textReader = new StreamReader((string)filename);
string buffer = textReader.ReadToEnd();
textReader.Close();
// We want to evaluate the whole file, so there is an implicit do
// which we now make explicit
string expression = string.Format("(do {0})", buffer);
object input = Reader.Read(new StringReader(expression), ReadTable.DefaultReadTable());
object output = Runtime.Eval(input, environment);
return(output);
}
throw new LSharpException(String.Format("Using: {0} is not a string", filename));
}
public void InitialiseLSharpBindings()
{
isresetting = true;
foreach (Extension e in extensions)
{
InitSymbols(e.type, e.delegatetype);
extmark++;
}
// leppie: should this not be Assign() ?
// read table
Assign(Symbol.FromName("*readtable*"), ReadTable.DefaultReadTable());
// Macros
foreach (Type t in macroextensions)
{
InitMacros(t);
}
isresetting = false;
}
public static Object Read(TextReader textReader, ReadTable readTable)
{
return Read(textReader, readTable, null);
}
public static Object Read(TextReader textReader, ReadTable readTable, object eofValue)
{
int c = textReader.Read();
while (Char.IsWhiteSpace((Char)c))
{
c = textReader.Read();
}
if (c == -1)
{
// End of file
return eofValue;
}
Object f = readTable.GetMacroCharacter(c);
if (f != null)
{
return ((ReaderMacro) f)(textReader, readTable);
}
else
{
return AtomReader(c, textReader);
}
}
public static Object Read(TextReader textReader, ReadTable readTable)
{
return(Read(textReader, readTable, EOFVALUE));
}
