Changed addition operators to right associative

.gitignore

@@ -3,4 +3,3 @@ out/
 *.zip
 prg/**/*.ast
 prg/**/*.out
-prg/**/*.pins25

grammar.txt

@@ -39,8 +39,9 @@ restcmp -> EQU addexpr
 		 | .
 
 addexpr -> multexpr restadd .
-restadd -> ADD multexpr restadd
+restadd -> ADD addexpr
-		 | SUB multexpr restadd | .
+		 | SUB addexpr
+		 | .
 
 multexpr -> prefixexpr restmult .
 restmult -> MUL prefixexpr restmult

prg/test.pins25

@@ -0,0 +1,3 @@
+
+fun main() =
+	3 - 2 - 1

src/pins25/phase/SynAn.java

@@ -5,7 +5,6 @@ import pins25.common.*;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
-import java.util.Objects;
 
 /**
  * Sintaksni analizator.
@@ -467,7 +466,7 @@ public class SynAn implements AutoCloseable {
         checkExpression();
 
         // cmpexpr -> addexpr restcmp
-        AST.Expr left = parseSubstractionExpression();
+        AST.Expr left = parseAdditionExpression();
         return parseRestComparisons(left);
     }
 
@@ -477,7 +476,7 @@ public class SynAn implements AutoCloseable {
             case EQU: {
                 // restcmp -> EQU addexpr
                 check(Token.Symbol.EQU);
-                AST.Expr right = parseSubstractionExpression();
+                AST.Expr right = parseAdditionExpression();
                 AST.BinExpr binExpr = new AST.BinExpr(AST.BinExpr.Oper.EQU, left, right);
                 attrLoc.put(binExpr, new Report.Location(attrLoc.get(left), attrLoc.get(right)));
                 return binExpr;
@@ -485,7 +484,7 @@ public class SynAn implements AutoCloseable {
             case NEQ: {
                 // restcmp -> NEQ addexpr
                 check(Token.Symbol.NEQ);
-                AST.Expr right = parseSubstractionExpression();
+                AST.Expr right = parseAdditionExpression();
                 AST.BinExpr binExpr = new AST.BinExpr(AST.BinExpr.Oper.NEQ, left, right);
                 attrLoc.put(binExpr, new Report.Location(attrLoc.get(left), attrLoc.get(right)));
                 return binExpr;
@@ -493,7 +492,7 @@ public class SynAn implements AutoCloseable {
             case LTH: {
                 // restcmp -> LTH addexpr
                 check(Token.Symbol.LTH);
-                AST.Expr right = parseSubstractionExpression();
+                AST.Expr right = parseAdditionExpression();
                 AST.BinExpr binExpr = new AST.BinExpr(AST.BinExpr.Oper.LTH, left, right);
                 attrLoc.put(binExpr, new Report.Location(attrLoc.get(left), attrLoc.get(right)));
                 return binExpr;
@@ -501,7 +500,7 @@ public class SynAn implements AutoCloseable {
             case GTH: {
                 // restcmp -> GTH addexpr
                 check(Token.Symbol.GTH);
-                AST.Expr right = parseSubstractionExpression();
+                AST.Expr right = parseAdditionExpression();
                 AST.BinExpr binExpr = new AST.BinExpr(AST.BinExpr.Oper.GTH, left, right);
                 attrLoc.put(binExpr, new Report.Location(attrLoc.get(left), attrLoc.get(right)));
                 return binExpr;
@@ -509,7 +508,7 @@ public class SynAn implements AutoCloseable {
             case LEQ: {
                 // restcmp -> LEQ addexpr
                 check(Token.Symbol.LEQ);
-                AST.Expr right = parseSubstractionExpression();
+                AST.Expr right = parseAdditionExpression();
                 AST.BinExpr binExpr = new AST.BinExpr(AST.BinExpr.Oper.LEQ, left, right);
                 attrLoc.put(binExpr, new Report.Location(attrLoc.get(left), attrLoc.get(right)));
                 return binExpr;
@@ -517,7 +516,7 @@ public class SynAn implements AutoCloseable {
             case GEQ: {
                 // restcmp -> GEQ addexpr
                 check(Token.Symbol.GEQ);
-                AST.Expr right = parseSubstractionExpression();
+                AST.Expr right = parseAdditionExpression();
                 AST.BinExpr binExpr = new AST.BinExpr(AST.BinExpr.Oper.GEQ, left, right);
                 attrLoc.put(binExpr, new Report.Location(attrLoc.get(left), attrLoc.get(right)));
                 return binExpr;
@@ -529,28 +528,39 @@ public class SynAn implements AutoCloseable {
         }
     }
 
-
+    private AST.Expr parseAdditionExpression() {
-    private AST.Expr parseSubstractionExpression() {
         checkExpression();
 
-        // subexpr -> multexpr restsub
+        // addexpr -> multexpr restadd
         AST.Expr left = parseMultiplicationExpression();
-        return parseRestSubtractionExpressions(left);
+        return parseRestAdditionExpressions(left);
     }
 
-    private AST.Expr parseRestSubtractionExpressions(AST.Expr left) {
+    private AST.Expr parseRestAdditionExpressions(AST.Expr left) {
         Token token = lexAn.peekToken();
-        if (Objects.requireNonNull(token.symbol()) == Token.Symbol.SUB) {
+        switch (token.symbol()) {
-            // restsub -> SUB multexpr restsub
+            case ADD: {
+                // restadd -> ADD addexpr
+                check(Token.Symbol.ADD);
+                AST.Expr right = parseAdditionExpression();
+                AST.Expr binExpr = new AST.BinExpr(AST.BinExpr.Oper.ADD, left, right);
+                attrLoc.put(binExpr, new Report.Location(attrLoc.get(left), attrLoc.get(right)));
+                return binExpr;
+            }
+            case SUB: {
+                // restadd -> ADD addexpr
                 check(Token.Symbol.SUB);
-            AST.Expr right = parseMultiplicationExpression();
+                AST.Expr right = parseAdditionExpression();
                 AST.Expr binExpr = new AST.BinExpr(AST.BinExpr.Oper.SUB, left, right);
                 attrLoc.put(binExpr, new Report.Location(attrLoc.get(left), attrLoc.get(right)));
-            return parseRestSubtractionExpressions(binExpr);
+                return binExpr;
             }
-        // restsub -> ε
+
+            default:
+                // restadd -> ε
                 return left;
         }
+    }
 
     private AST.Expr parseMultiplicationExpression() {
         checkExpression();
@@ -564,25 +574,25 @@ public class SynAn implements AutoCloseable {
         Token token = lexAn.peekToken();
         switch (token.symbol()) {
             case MUL: {
-                // restmult -> MUL addexpr restmult
+                // restmult -> MUL prefixexpr restmult
                 check(Token.Symbol.MUL);
-                AST.Expr right = parseAdditionExpression();
+                AST.Expr right = parsePrefixExpression();
                 AST.Expr binExpr = new AST.BinExpr(AST.BinExpr.Oper.MUL, left, right);
                 attrLoc.put(binExpr, new Report.Location(attrLoc.get(left), attrLoc.get(right)));
                 return parseRestMultiplicationExpressions(binExpr);
             }
             case DIV: {
-                // restmult -> DIV addexpr restmult
+                // restmult -> DIV prefixexpr restmult
                 check(Token.Symbol.DIV);
-                AST.Expr right = parseAdditionExpression();
+                AST.Expr right = parsePrefixExpression();
                 AST.Expr binExpr = new AST.BinExpr(AST.BinExpr.Oper.DIV, left, right);
                 attrLoc.put(binExpr, new Report.Location(attrLoc.get(left), attrLoc.get(right)));
                 return parseRestMultiplicationExpressions(binExpr);
             }
             case MOD: {
-                // restmult -> MOD addexpr restmult
+                // restmult -> MOD prefixexpr restmult
                 check(Token.Symbol.MOD);
-                AST.Expr right = parseAdditionExpression();
+                AST.Expr right = parsePrefixExpression();
                 AST.Expr binExpr = new AST.BinExpr(AST.BinExpr.Oper.MOD, left, right);
                 attrLoc.put(binExpr, new Report.Location(attrLoc.get(left), attrLoc.get(right)));
                 return parseRestMultiplicationExpressions(binExpr);
@@ -594,28 +604,6 @@ public class SynAn implements AutoCloseable {
         }
     }
 
-    private AST.Expr parseAdditionExpression() {
-        checkExpression();
-
-        // addexpr -> prefexpr restadd
-        AST.Expr left = parsePrefixExpression();
-        return parseRestAdditionExpressions(left);
-    }
-
-    private AST.Expr parseRestAdditionExpressions(AST.Expr left) {
-        Token token = lexAn.peekToken();
-        if (Objects.requireNonNull(token.symbol()) == Token.Symbol.ADD) {
-            // restadd -> ADD multexpr restadd
-            check(Token.Symbol.ADD);
-            AST.Expr right = parsePrefixExpression();
-            AST.Expr binExpr = new AST.BinExpr(AST.BinExpr.Oper.ADD, left, right);
-            attrLoc.put(binExpr, new Report.Location(attrLoc.get(left), attrLoc.get(right)));
-            return parseRestAdditionExpressions(binExpr);
-        }
-        // restadd -> ε
-        return left;
-    }
-
     private AST.Expr parsePrefixExpression() {
         checkExpression();