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* fixed bug 42

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This commit is contained in:
peter 1998-08-18 20:51:32 +00:00
parent d72ca253fe
commit df5ca5be09
1 changed files with 70 additions and 66 deletions
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136
compiler/asmutils.pas
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@ -451,6 +451,7 @@ begin
end;
end;
Function TExprParse.Evaluate(Expr : String):longint;
Var
I : Integer;
@ -462,78 +463,78 @@ begin
Token := '';
For I := 1 to Length(Expr) DO
begin
if Expr[I] in ['0'..'9'] then
begin { Build multi-digit numbers }
Token := Token + Expr[I];
if I = Length(Expr) then { Send last one to calculator }
RPNCalc(Token,false);
Token := Token + Expr[I];
if I = Length(Expr) then { Send last one to calculator }
RPNCalc(Token,false);
end
else
if Expr[I] in ['+', '-', '*', '/', '(', ')','^','&','|','%','~','<','>'] then
begin
if Token <> '' then
begin { Send last built number to calc. }
RPNCalc(Token,false);
Token := '';
if Expr[I] in ['+', '-', '*', '/', '(', ')','^','&','|','%','~','<','>'] then
begin
if Token <> '' then
begin { Send last built number to calc. }
RPNCalc(Token,false);
Token := '';
end;
Case Expr[I] OF
'(' : OpPush('(',false);
')' : begin
While OpStack[OpTop].ch <> '(' DO
Begin
OpPop(opr);
RPNCalc(opr.ch,opr.is_prefix);
end;
OpPop(opr); { Pop off and ignore the '(' }
end;
'+','-','~' : Begin
{ workaround for -2147483648 }
if (expr[I]='-') and (expr[i+1] in ['0'..'9']) then
begin
token:='-';
expr[i]:='+';
end;
{ if start of expression then surely a prefix }
{ or if previous char was also an operator }
if (I = 1) or (not (Expr[I-1] in ['0'..'9','(',')'])) then
OpPush(Expr[I],true)
else
Begin
{ Evaluate all higher priority operators }
While (OpTop > 0) AND (Priority(Expr[I]) <= Priority(OpStack[OpTop].ch)) DO
Begin
OpPop(opr);
RPNCalc(opr.ch,opr.is_prefix);
end;
OpPush(Expr[I],false);
End;
end;
'*', '/',
'^','|','&',
'%','<','>' : begin
While (OpTop > 0) and (Priority(Expr[I]) <= Priority(OpStack[OpTop].ch)) DO
Begin
OpPop(opr);
RPNCalc(opr.ch,opr.is_prefix);
end;
OpPush(Expr[I],false);
end;
end; { Case }
end
else
Error(invalid_op); { Handle bad input error }
end;
Case Expr[I] OF
'(' : OpPush('(',false);
')' :
begin
While OpStack[OpTop].ch <> '(' DO
Begin
OpPop(opr);
RPNCalc(opr.ch,opr.is_prefix);
end;
OpPop(opr); { Pop off and ignore the '(' }
end;
{ Pop off the remaining operators }
While OpTop > 0 do
Begin
OpPop(opr);
RPNCalc(opr.ch,opr.is_prefix);
end;
'+','-','~': Begin
While (OpTop > 0) AND
(Priority(Expr[I]) <= Priority(OpStack[OpTop].ch)) DO
Begin
OpPop(opr);
RPNCalc(opr.ch,opr.is_prefix);
end;
{ if start of expression then surely a prefix }
{ or if previous char was also an operator }
{ push it and don't evaluate normally }
{ workaround for -2147483648 }
if (expr[I]='-') and (expr[i+1] in ['0'..'9']) then
begin
token:='-';
expr[i]:='+';
end;
if (I = 1) or (not (Expr[I-1] in ['0'..'9','(',')'])) then
OpPush(Expr[I],true)
else
OpPush(Expr[I],false);
end;
'*', '/','^','|','&','%','<','>' :
begin
While (OpTop > 0) AND
(Priority(Expr[I]) <= Priority(OpStack[OpTop].ch)) DO
Begin
OpPop(opr);
RPNCalc(opr.ch,opr.is_prefix);
end;
OpPush(Expr[I],false);
end;
end; { Case }
end
else Error(invalid_op);
{ Handle bad input error }
While OpTop > 0 do { Pop off the remaining operators }
Begin
OpPop(opr);
RPNCalc(opr.ch,opr.is_prefix);
end;
{ The result is stored on the top of the stack }
{ The result is stored on the top of the stack }
Evaluate := RPNPop;
end;
@ -1628,7 +1629,10 @@ end;
end.
{
$Log$
Revision 1.6 1998-08-10 14:49:40 peter
Revision 1.7 1998-08-18 20:51:32 peter
* fixed bug 42
Revision 1.6 1998/08/10 14:49:40 peter
+ localswitches, moduleswitches, globalswitches splitting
Revision 1.5 1998/07/14 21:46:38 peter