public static bool parse(iSCOPE context)
{
Debug.Indent();
Debug.WriteLine("Entering DECLARATION.parse");
bool result = true;
bool isHidden = false;
bool isFinal = false;
int pure_safe = 0;
bool isOverride = false;
bool isRoutine = false;
bool isAbstract = false;
Token token = get();
Token begin = token;
// Collecting specifiers
while (true)
{
switch (token.code)
{
case TokenCode.Abstract: isAbstract = true; forget(); break;
case TokenCode.Override: isOverride = true; forget(); break;
case TokenCode.Hidden: isHidden = true; forget(); break;
case TokenCode.Final: isFinal = true; isRoutine = true; forget(); break;
case TokenCode.Routine: isRoutine = true; forget(); break;
case TokenCode.Pure: pure_safe = 1; isRoutine = true; forget(); break;
case TokenCode.Safe: pure_safe = 2; isRoutine = true; forget(); break;
default: goto OutLoop;
}
token = get();
}
OutLoop:
// Checking for a leading keyword
switch (token.code)
{
case TokenCode.Unit:
if (isOverride || isRoutine || pure_safe > 0)
{
// Illegal specifier for unit declaration
error(token, "illegal-spec", begin, "unit declaration");
}
UNIT.parse(isHidden, isFinal, isAbstract, context);
break;
case TokenCode.Const:
if (isRoutine || pure_safe > 0)
{
// Illegal specifier for constant declaration
error(begin, "illegal-spec", begin, "object declaration");
}
Token start = token;
forget(); token = get();
if (token.code == TokenCode.Is)
{
forget();
if (isOverride)
{
// Illegal specifier for constant declaration
error(begin, "illegal-spec", begin, "constant declaration");
}
CONSTANT.parse(isHidden, isFinal, start, context);
}
else
{
if (pure_safe > 0)
{
// Illegal specifier for variable declaration
error(begin, "illegal-spec", begin, "variable declaration");
}
VARIABLE.parse(isHidden, isFinal, true, isOverride, null, null, context);
}
break;
case TokenCode.Init:
forget();
if (isOverride || isFinal || isRoutine || pure_safe > 0)
{
// Illegal specifier for initializer
error(begin, "illegal-spec", begin, "initializer declaration");
}
ROUTINE.parse(token, isHidden, isFinal, false, 0, context);
break;
case TokenCode.Identifier:
// An identifier just following (optional) specifier(s)
if (isRoutine || pure_safe > 0)
{
// This is definitely a routine declaration
// (Some time after, 'isRoutine' might be removed...)
forget();
ROUTINE.parse(token, isHidden, isFinal, isOverride, pure_safe, context);
}
else
{
// Decide whether this is variable or routine declaration
if (!isOverride || !isHidden || !isFinal)
{
if (!(context is UNIT))
{
// Tricky point:
// We are out of a unit context, i.e., within a routine
// or in a global scope, AND there is NO ONE specifier given.
// So, we conclude that identifier starts a statement
// but not a declaration.
// We do nothing and silently exit with result == false.
break;
}
}
Token id = token;
forget(); token = get(); // forget();
switch (token.code)
{
case TokenCode.LParen:
case TokenCode.LBracket:
case TokenCode.Then:
case TokenCode.Else:
ROUTINE.parse(id, isHidden, isFinal, isOverride, pure_safe, context);
break;
default:
forget();
VARIABLE.parse(isHidden, isFinal, false, isOverride, id, token, context);
break;
}
break;
}
break;
default:
// Some other token after optional specifier(s).
// Perhaps this is an operator sign?
Token name = ROUTINE.detectOperatorSign(token);
if (name.code != TokenCode.ERROR)
{
ROUTINE.parse(name, isHidden, isFinal, isOverride, pure_safe, context);
}
else if (isRoutine || isOverride || isHidden)
{
// Syntax error in declaration
error(token, "syntax-error", "wrong declaration");
result = false;
}
else
{
// What's this? -- something that is not a declaration.
// Don't issue a message
// error(token,"syntax-error");
result = false;
}
break;
}
Debug.WriteLine("Exiting DECLARATION.parse");
Debug.Unindent();
return(result);
}
public static void parse(TokenCode stop1, TokenCode stop2, TokenCode stop3, iSCOPE context)
{
Debug.Indent();
Debug.WriteLine("Entering BODY.parse");
Token token;
Token start = get();
while (true)
{
bool res = STATEMENT.parse(context, stop1, stop2, stop3);
if (!res)
{
// Neither a statement nor a simple declaration.
// Perhaps, a nested/local function?
token = get();
switch (token.code)
{
case TokenCode.Routine:
case TokenCode.Safe:
case TokenCode.Pure:
forget();
int pure_safe = 0;
switch (token.code)
{
case TokenCode.Pure: pure_safe = 1; break;
case TokenCode.Safe: pure_safe = 2; break;
}
ROUTINE.parse(null, false, false, false, pure_safe, context);
break;
case TokenCode.Unit:
case TokenCode.Ref:
case TokenCode.Val:
// A _local_ unit???
UNIT.parse(context);
break;
default:
// What's this?
break;
}
}
token = get();
if (token.code == TokenCode.Semicolon /*|| wasEOL*/)
{
forget();
}
if (token.code == stop1)
{
break; // don't 'forget()'
}
if (stop2 != TokenCode.ERROR && token.code == stop2)
{
break; // don't 'forget()'
}
if (stop3 != TokenCode.ERROR && token.code == stop3)
{
break; // don't 'forget()'
}
}
BODY body = context as BODY;
if (body == null) /* A system error */ } {
/// <summary>
///
/// </summary>
/// <returns></returns>
public static COMPILATION parse()
{
Debug.Indent();
Debug.WriteLine("Entering COMPILATION.parse");
COMPILATION compilation = new COMPILATION();
Context.enter(compilation);
Token start = get();
Token startAnon = null;
Token endAnon = null;
int pure_safe = 0;
while (true)
{
Token token = get();
Token begin = token;
switch (token.code)
{
case TokenCode.Final:
forget();
token = get();
switch (token.code)
{
case TokenCode.Unit:
case TokenCode.Package:
case TokenCode.Ref:
case TokenCode.Val:
case TokenCode.Concurrent:
// Don't forget()
UNIT.parse(false, true, false, compilation);
break;
case TokenCode.Abstract:
forget();
UNIT.parse(false, true, true, compilation);
break;
case TokenCode.Safe:
case TokenCode.Pure:
case TokenCode.Routine:
forget();
switch (token.code)
{
case TokenCode.Pure: pure_safe = 1; break;
case TokenCode.Safe: pure_safe = 2; break;
}
ROUTINE.parse(null, false, true, false, pure_safe, compilation);
pure_safe = 0;
break;
}
break;
case TokenCode.Ref:
case TokenCode.Val:
case TokenCode.Concurrent:
case TokenCode.Unit:
case TokenCode.Package:
UNIT.parse(false, false, false, compilation);
break;
case TokenCode.Abstract:
forget();
UNIT.parse(false, false, true, compilation);
break;
case TokenCode.Use:
USE.parse(compilation);
break;
case TokenCode.Routine:
case TokenCode.Safe:
case TokenCode.Pure:
forget();
switch (token.code)
{
case TokenCode.Pure: pure_safe = 1; break;
case TokenCode.Safe: pure_safe = 2; break;
}
ROUTINE.parse(null, false, false, false, pure_safe, compilation);
pure_safe = 0;
break;
case TokenCode.EOS:
goto Finish;
case TokenCode.EOL:
forget();
break;
default:
// A call/assignment statement, or an error
if (startAnon == null)
{
startAnon = get();
}
bool result = STATEMENT.parse(compilation.anonymous.routineBody,
TokenCode.EOS, TokenCode.ERROR, TokenCode.ERROR);
if (!result)
{
// There was not a statement:
// apparently, this is a syntax error
goto Finish;
}
endAnon = get();
break;
}
}
Finish:
compilation.setSpan(start, get());
if (startAnon != null && endAnon != null)
{
compilation.anonymous.setSpan(startAnon, endAnon);
}
Debug.WriteLine("Exiting COMPILATION.parse");
Debug.Unindent();
Context.exit();
return(compilation);
}