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Changed addition operators to right associative

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Gašper Dobrovoljc 2025-06-03 18:41:44 +02:00
parent 1b45d6a0f9
commit 8251a3608c
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GPG Key ID: 0E7E037018CFA5A5
4 changed files with 12 additions and 9 deletions
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1
.gitignore vendored
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@ -3,4 +3,3 @@ out/
*.zip
prg/**/*.ast
prg/**/*.out
prg/**/*.pins25

5
grammar.txt
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@ -39,8 +39,9 @@ restcmp -> EQU addexpr
| .
addexpr -> multexpr restadd .
restadd -> ADD multexpr restadd
| SUB multexpr restadd | .
restadd -> ADD addexpr
| SUB addexpr
| .
multexpr -> prefixexpr restmult .
restmult -> MUL prefixexpr restmult

3
prg/test.pins25 Normal file
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@ -0,0 +1,3 @@
fun main() =
3 - 2 - 1

12
src/pins25/phase/SynAn.java
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@ -540,20 +540,20 @@ public class SynAn implements AutoCloseable {
Token token = lexAn.peekToken();
switch (token.symbol()) {
case ADD: {
// restadd -> ADD multexpr restadd
// restadd -> ADD addexpr
check(Token.Symbol.ADD);
AST.Expr right = parseMultiplicationExpression();
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 parseRestAdditionExpressions(binExpr);
return binExpr;
}
case SUB: {
// restadd -> SUB multexpr restadd
// 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 parseRestAdditionExpressions(binExpr);
return binExpr;
}
default: