1 Commits

Author SHA1 Message Date
Gašper Dobrovoljc
8251a3608c Changed addition operators to right associative 2025-06-03 18:41:44 +02:00
6 changed files with 15 additions and 17 deletions

1
.gitignore vendored
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@@ -3,4 +3,3 @@ out/
*.zip
prg/**/*.ast
prg/**/*.out
prg/**/*.pins25

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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

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@@ -69,10 +69,6 @@ public record Token(Report.Location location, Symbol symbol, String lexeme) impl
* Kljucna beseda {@code in}.
*/
IN,
/**
* Kljucna beseda {@code times}.
*/
TIMES,
/**
* Kljucna beseda {@code end}.
*/

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@@ -319,7 +319,6 @@ public class LexAn implements AutoCloseable {
case "let" -> Token.Symbol.LET;
case "in" -> Token.Symbol.IN;
case "end" -> Token.Symbol.END;
case "times" -> Token.Symbol.TIMES;
default -> null;
};
}

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@@ -360,9 +360,9 @@ public class SynAn implements AutoCloseable {
private AST.AtomExpr parseIntegerConstantMultiplier() {
Token token = lexAn.peekToken();
if (token.symbol() == Token.Symbol.TIMES) {
// intconstmult -> TIMES const
check(Token.Symbol.TIMES);
if (token.symbol() == Token.Symbol.MUL) {
// intconstmult -> MUL const
check(Token.Symbol.MUL);
return parseConstant();
}
// intconstmult -> ε
@@ -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: