Make + operator bind more strongly than multiplication operators

src/pins25/phase/SynAn.java

@@ -5,6 +5,7 @@ import pins25.common.*;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
+import java.util.Objects;
 
 /**
  * Sintaksni analizator.
@@ -466,7 +467,7 @@ public class SynAn implements AutoCloseable {
         checkExpression();
 
         // cmpexpr -> addexpr restcmp
-        AST.Expr left = parseAdditionExpression();
+        AST.Expr left = parseSubstractionExpression();
         return parseRestComparisons(left);
     }
 
@@ -476,7 +477,7 @@ public class SynAn implements AutoCloseable {
             case EQU: {
                 // restcmp -> EQU addexpr
                 check(Token.Symbol.EQU);
-                AST.Expr right = parseAdditionExpression();
+                AST.Expr right = parseSubstractionExpression();
                 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;
@@ -484,7 +485,7 @@ public class SynAn implements AutoCloseable {
             case NEQ: {
                 // restcmp -> NEQ addexpr
                 check(Token.Symbol.NEQ);
-                AST.Expr right = parseAdditionExpression();
+                AST.Expr right = parseSubstractionExpression();
                 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;
@@ -492,7 +493,7 @@ public class SynAn implements AutoCloseable {
             case LTH: {
                 // restcmp -> LTH addexpr
                 check(Token.Symbol.LTH);
-                AST.Expr right = parseAdditionExpression();
+                AST.Expr right = parseSubstractionExpression();
                 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;
@@ -500,7 +501,7 @@ public class SynAn implements AutoCloseable {
             case GTH: {
                 // restcmp -> GTH addexpr
                 check(Token.Symbol.GTH);
-                AST.Expr right = parseAdditionExpression();
+                AST.Expr right = parseSubstractionExpression();
                 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;
@@ -508,7 +509,7 @@ public class SynAn implements AutoCloseable {
             case LEQ: {
                 // restcmp -> LEQ addexpr
                 check(Token.Symbol.LEQ);
-                AST.Expr right = parseAdditionExpression();
+                AST.Expr right = parseSubstractionExpression();
                 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;
@@ -516,7 +517,7 @@ public class SynAn implements AutoCloseable {
             case GEQ: {
                 // restcmp -> GEQ addexpr
                 check(Token.Symbol.GEQ);
-                AST.Expr right = parseAdditionExpression();
+                AST.Expr right = parseSubstractionExpression();
                 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;
@@ -528,38 +529,27 @@ public class SynAn implements AutoCloseable {
         }
     }
 
-    private AST.Expr parseAdditionExpression() {
+
+    private AST.Expr parseSubstractionExpression() {
         checkExpression();
 
-        // addexpr -> multexpr restadd
+        // subexpr -> multexpr restsub
         AST.Expr left = parseMultiplicationExpression();
-        return parseRestAdditionExpressions(left);
+        return parseRestSubtractionExpressions(left);
     }
 
-    private AST.Expr parseRestAdditionExpressions(AST.Expr left) {
+    private AST.Expr parseRestSubtractionExpressions(AST.Expr left) {
         Token token = lexAn.peekToken();
-        switch (token.symbol()) {
-            case ADD: {
-                // restadd -> ADD multexpr restadd
-                check(Token.Symbol.ADD);
-                AST.Expr right = parseMultiplicationExpression();
-                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);
-            }
-            case SUB: {
-                // restadd -> SUB multexpr restadd
-                check(Token.Symbol.SUB);
-                AST.Expr right = parseMultiplicationExpression();
-                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 parseRestAdditionExpressions(binExpr);
-            }
-
-            default:
-                // restadd -> ε
-                return left;
+        if (Objects.requireNonNull(token.symbol()) == Token.Symbol.SUB) {
+            // restsub -> SUB multexpr restsub
+            check(Token.Symbol.SUB);
+            AST.Expr right = parseMultiplicationExpression();
+            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);
         }
+        // restsub -> ε
+        return left;
     }
 
     private AST.Expr parseMultiplicationExpression() {
@@ -574,25 +564,25 @@ public class SynAn implements AutoCloseable {
         Token token = lexAn.peekToken();
         switch (token.symbol()) {
             case MUL: {
-                // restmult -> MUL prefixexpr restmult
+                // restmult -> MUL addexpr restmult
                 check(Token.Symbol.MUL);
-                AST.Expr right = parsePrefixExpression();
+                AST.Expr right = parseAdditionExpression();
                 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 prefixexpr restmult
+                // restmult -> DIV addexpr restmult
                 check(Token.Symbol.DIV);
-                AST.Expr right = parsePrefixExpression();
+                AST.Expr right = parseAdditionExpression();
                 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 prefixexpr restmult
+                // restmult -> MOD addexpr restmult
                 check(Token.Symbol.MOD);
-                AST.Expr right = parsePrefixExpression();
+                AST.Expr right = parseAdditionExpression();
                 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);
@@ -604,6 +594,28 @@ 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();