add ERROR directive

[cpc.git] / src / generic / Dev / Mod / CPR.cp

diff --git a/src/generic/Dev/Mod/CPR.cp b/src/generic/Dev/Mod/CPR.cp
index b43b539bd2beebe3747961b7bd2aa1acb037a02e..851d82e8b6000813164542de76d1b619d3e42194 100644 (file)
--- a/src/generic/Dev/Mod/CPR.cp
+++ b/src/generic/Dev/Mod/CPR.cp
@@ -7,10 +7,10 @@ MODULE DevCPR;
 
     (* symbol values *)
     null = 0;
-    if = 1; then = 2; else = 3; elsif = 4; end = 5; new = 6;
-    ident = 7; plus = 8; minus = 9;
-    not = 10; and = 11; or = 12; rpar = 13; lpar = 14;
-    endcom = 15; eof = 16;
+    if = 1; then = 2; else = 3; elsif = 4; end = 5;
+    new = 6; error = 7; ident = 8; plus = 9; minus = 10;
+    not = 11; and = 12; or = 13; rpar = 14; lpar = 15;
+    endcom = 16; eof = 17;
 
     (* func numbers *)
     var = 0; defined = 1;
@@ -74,6 +74,7 @@ MODULE DevCPR;
         IF name = "END" THEN sym := end
         ELSIF name = "ELSE" THEN sym := else
         ELSIF name = "ELSIF" THEN sym := elsif
+        ELSIF name = "ERROR" THEN sym := error
         END
     | "I": Identifier(sym); IF name = "IF" THEN sym := if END
     | "N": Identifier(sym); IF name = "NEW" THEN sym := new END
@@ -200,6 +201,14 @@ MODULE DevCPR;
     IF top = NIL THEN err(51); fold := 0; If(TRUE) END
   END End;
 
+  PROCEDURE Printable* (): BOOLEAN;
+    VAR c: Context;
+  BEGIN
+    c := top;
+    WHILE (c # NIL) & c.val DO c := c.next END;
+    RETURN c = NIL
+  END Printable;
+
   PROCEDURE Parse*;
     VAR val: BOOLEAN; s: Selector;
   BEGIN
@@ -209,6 +218,8 @@ MODULE DevCPR;
       IF sym = ident THEN s := New(name, FALSE); Get(sym)
       ELSE err(48)
       END
+    ELSIF sym = error THEN
+      IF Printable() THEN err(501) END; Get(sym)
     ELSIF sym = ident THEN
       Get(sym);
       IF sym = plus THEN Old(name).val := TRUE; Get(sym)
@@ -238,14 +249,6 @@ MODULE DevCPR;
     IF sym # endcom THEN err(5) ELSE DevCPM.errpos := DevCPM.curpos - 1 END
   END Parse;
 
-  PROCEDURE Printable* (): BOOLEAN;
-    VAR c: Context;
-  BEGIN
-    c := top;
-    WHILE (c # NIL) & c.val DO c := c.next END;
-    RETURN c = NIL
-  END Printable;
-
   PROCEDURE Check*;
   BEGIN
     IF fold # 1 THEN err(14) END