From: DeaDDooMER <deaddoomer@deadsoftware.ru>
Date: Sat, 14 Dec 2019 15:11:25 +0000 (+0300)
Subject: add function DEFINED to preprocessor
X-Git-Url: https://deadsoftware.ru/gitweb?p=cpc.git;a=commitdiff_plain;h=e52a3df8538aa38dde9851e00b98b0cffe3c6750

add function DEFINED to preprocessor
---

diff --git a/src/generic/Dev/Mod/CPR.cp b/src/generic/Dev/Mod/CPR.cp
index 233b121..b43b539 100644
--- a/src/generic/Dev/Mod/CPR.cp
+++ b/src/generic/Dev/Mod/CPR.cp
@@ -12,6 +12,9 @@ MODULE DevCPR;
     not = 10; and = 11; or = 12; rpar = 13; lpar = 14;
     endcom = 15; eof = 16;
 
+    (* func numbers *)
+    var = 0; defined = 1;
+
   TYPE
     Context = POINTER TO RECORD
       next: Context; (* upper level block *)
@@ -23,7 +26,8 @@ MODULE DevCPR;
     Selector = POINTER TO RECORD
       next: Selector;
       name: DevCPT.Name;
-      val: BOOLEAN
+      val: BOOLEAN;
+      num: BYTE
     END;
 
   VAR
@@ -82,14 +86,16 @@ MODULE DevCPR;
     END
   END Get;
 
-  PROCEDURE New (IN name: DevCPT.Name; val: BOOLEAN);
+  PROCEDURE New (IN name: DevCPT.Name; val: BOOLEAN): Selector;
     VAR s: Selector;
   BEGIN
     s := scope;
     WHILE (s.next # NIL) & (s.next.name$ # name$) DO s := s.next END;
-    IF s.next = NIL THEN NEW(s.next); s.next.name := name$; s.next.val := val
+    IF s.next = NIL THEN
+      NEW(s.next); s.next.name := name$; s.next.num := var; s.next.val := val
     ELSE err(1)
-    END
+    END;
+    RETURN s.next
   END New;
 
   PROCEDURE Old (IN name: DevCPT.Name): Selector;
@@ -98,7 +104,7 @@ MODULE DevCPR;
     s := scope;
     WHILE (s.next # NIL) & (s.next.name$ # name$) DO s := s.next END;
     IF s.next = NIL THEN
-      err(0); NEW(s.next); s.next.name := name$; s.next.val := FALSE
+      err(0); NEW(s.next); s.next.name := name$; s.next.num := var; s.next.val := FALSE
     END;
     RETURN s.next
   END Old;
@@ -116,15 +122,32 @@ MODULE DevCPR;
   BEGIN
     s := scope;
     WHILE (s.next # NIL) & (s.next.name$ # name$) DO s := s.next END;
-    IF s.next = NIL THEN NEW(s.next); s.next.name := name$; s.next.val := val END
+    IF s.next = NIL THEN NEW(s.next) END;
+    s.next.name := name$; s.next.num := var; s.next.val := val
   END Set;
 
   PROCEDURE ^ Expression (VAR x: BOOLEAN);
 
   PROCEDURE Factor (VAR x: BOOLEAN);
+    VAR s: Selector;
   BEGIN x := FALSE;
     IF sym = ident THEN
-      x := Old(name).val; Get(sym)
+      s := Old(name); Get(sym);
+      IF s.num = var THEN
+         x := s.val
+      ELSIF sym = lpar THEN
+        Get(sym);
+        ASSERT(s.num = defined);
+        IF sym = ident THEN
+          x := Find(name) # NIL; Get(sym)
+        ELSE err(48)
+        END;
+        IF sym # rpar THEN err(23)
+        ELSE Get(sym)
+        END
+      ELSE
+        err(40)
+      END
     ELSIF sym = lpar THEN
       Get(sym); Expression(x);
       IF sym # rpar THEN err(23)
@@ -178,12 +201,12 @@ MODULE DevCPR;
   END End;
 
   PROCEDURE Parse*;
-    VAR val: BOOLEAN;
+    VAR val: BOOLEAN; s: Selector;
   BEGIN
     Get(sym);
     IF sym = new THEN
       Get(sym);
-      IF sym = ident THEN New(name, FALSE); Get(sym)
+      IF sym = ident THEN s := New(name, FALSE); Get(sym)
       ELSE err(48)
       END
     ELSIF sym = ident THEN
@@ -235,12 +258,14 @@ MODULE DevCPR;
   END Close;
 
   PROCEDURE Init*;
+    VAR s: Selector;
   BEGIN
     Close;
     If(TRUE);
     NEW(scope);
-    New("TRUE", TRUE);
-    New("FALSE", FALSE)
+    s := New("TRUE", TRUE);
+    s := New("FALSE", FALSE);
+    s := New("DEFINED", FALSE); s.num := defined
   END Init;
 
 END DevCPR.