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fix: correct unary minus/plus/tilde precedence #1236

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fix: correct unary minus/plus/tilde precedence #1236

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46bb4a0
fix: correct unary minus/plus/tilde precedence
jorgsowa Mar 30, 2026
f8e194c
Merge branch 'main' into fix/unary-minus-precedence
jorgsowa May 14, 2026
d7180f5
fix: instanceof precedence
jorgsowa May 14, 2026
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8 changes: 5 additions & 3 deletions src/ast.js
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Original file line number Diff line number Diff line change
Expand Up @@ -147,10 +147,10 @@ AST.precedence = {};
["==", "!=", "===", "!==", /* '<>', */ "<=>"],
["<", "<=", ">", ">="],
["<<", ">>"],
["instanceof"],
["+", "-", "."],
["*", "/", "%"],
["!"],
["instanceof"],
["!", "u-", "u+", "u~"], // u- etc. are unary variants; higher than * so -20*5 parses as (-20)*5
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@czosel czosel May 12, 2026

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Not sure how relevant in practice, but according to https://www.php.net/manual/en/language.operators.precedence.php the unary operators have even higher precedence than instanceof. Would it make sense to reflect this here?
Also, tangentially, are we lacking ++ and --?

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@jorgsowa jorgsowa May 14, 2026

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Good point. I changed the precedence of instanceof. Pre and post increment operators, we can tackle in another branch.

["cast", "silent"],
["**"],
// TODO: [ (array)
Expand Down Expand Up @@ -300,7 +300,9 @@ AST.prototype.resolvePrecedence = function (result, parser) {
// https://github.com/glayzzle/php-parser/issues/75
if (result.what && !result.what.parenthesizedExpression) {
if (result.what.kind === "bin") {
lLevel = AST.precedence[result.type];
// use the unary-specific precedence (u-, u+, u~) which is higher than binary - and +
lLevel =
AST.precedence["u" + result.type] || AST.precedence[result.type];
rLevel = AST.precedence[result.what.type];
if (lLevel && rLevel && rLevel < lLevel) {
buffer = result.what;
Expand Down
4 changes: 2 additions & 2 deletions test/precedence.test.js
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Original file line number Diff line number Diff line change
Expand Up @@ -119,8 +119,8 @@ describe("Test precedence", function () {
shouldBeSame("5 AND 4 + 3", "5 AND (4 + 3)");
});
it("test unary : !", function () {
shouldBeSame("!$a instanceof $b", "!($a instanceof $b)");
shouldBeSame("!$a + $b instanceof $c", "(!$a) + ($b instanceof $c)");
shouldBeSame("!$a instanceof $b", "(!$a) instanceof $b");
shouldBeSame("!$a + $b instanceof $c", "((!$a) + $b) instanceof $c");
shouldBeSame("6 + !4 + 5", "6 + (!4) + 5");
shouldBeSame("if($a && !$b) {}", "if($a && (!$b)) {}");
});
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96 changes: 48 additions & 48 deletions test/snapshot/__snapshots__/attributes.test.js.snap
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Expand Up @@ -1591,74 +1591,74 @@ Program {
"attrs": [
Attribute {
"args": [
Unary {
"kind": "unary",
"type": "-",
"what": Bin {
Bin {
"kind": "bin",
"left": Bin {
"kind": "bin",
"left": Bin {
"kind": "bin",
"left": Bin {
"kind": "bin",
"left": Bin {
"kind": "bin",
"left": Number {
"left": Unary {
"kind": "unary",
"type": "-",
"what": Number {
"kind": "number",
"value": "20",
},
"right": Unary {
},
"right": Bin {
"kind": "bin",
"left": Unary {
"kind": "unary",
"parenthesizedExpression": true,
"type": "+",
"what": Bin {
"kind": "bin",
"left": Number {
"kind": "number",
"value": "10",
},
"right": Number {
"kind": "number",
"value": "5",
},
"type": "/",
"what": Number {
"kind": "number",
"value": "10",
},
},
"type": "*",
},
"right": Number {
"kind": "number",
"value": "2",
"parenthesizedExpression": true,
"right": Number {
"kind": "number",
"value": "5",
},
"type": "/",
},
"type": "%",
"type": "*",
},
"right": Bin {
"kind": "bin",
"left": Number {
"kind": "number",
"value": "8",
},
"right": Number {
"kind": "number",
"value": "2",
},
"type": "**",
"right": Number {
"kind": "number",
"value": "2",
},
"type": "+",
"type": "%",
},
"right": Unary {
"right": Bin {
"kind": "bin",
"left": Number {
"kind": "number",
"value": "8",
},
"right": Number {
"kind": "number",
"value": "2",
},
"type": "**",
},
"type": "+",
},
"right": Unary {
"kind": "unary",
"type": "+",
"what": Unary {
"kind": "unary",
"type": "+",
"what": Unary {
"kind": "unary",
"type": "-",
"what": Number {
"kind": "number",
"value": "2",
},
"type": "-",
"what": Number {
"kind": "number",
"value": "2",
},
},
"type": "-",
},
"type": "-",
},
],
"kind": "attribute",
Expand Down
148 changes: 148 additions & 0 deletions test/snapshot/__snapshots__/unary.test.js.snap
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Expand Up @@ -479,6 +479,154 @@ Program {
}
`;

exports[`Test unary precedence over add 1`] = `
Program {
"children": [
ExpressionStatement {
"expression": Bin {
"kind": "bin",
"left": Unary {
"kind": "unary",
"type": "-",
"what": Number {
"kind": "number",
"value": "20",
},
},
"right": Number {
"kind": "number",
"value": "5",
},
"type": "+",
},
"kind": "expressionstatement",
},
],
"errors": [],
"kind": "program",
}
`;

exports[`Test unary precedence over mul 1`] = `
Program {
"children": [
ExpressionStatement {
"expression": Bin {
"kind": "bin",
"left": Unary {
"kind": "unary",
"type": "-",
"what": Number {
"kind": "number",
"value": "20",
},
},
"right": Number {
"kind": "number",
"value": "5",
},
"type": "*",
},
"kind": "expressionstatement",
},
],
"errors": [],
"kind": "program",
}
`;

exports[`Test unary precedence over mul and add 1`] = `
Program {
"children": [
ExpressionStatement {
"expression": Bin {
"kind": "bin",
"left": Bin {
"kind": "bin",
"left": Unary {
"kind": "unary",
"type": "-",
"what": Number {
"kind": "number",
"value": "20",
},
},
"right": Number {
"kind": "number",
"value": "5",
},
"type": "*",
},
"right": Number {
"kind": "number",
"value": "10",
},
"type": "+",
},
"kind": "expressionstatement",
},
],
"errors": [],
"kind": "program",
}
`;

exports[`Test unary precedence with plus 1`] = `
Program {
"children": [
ExpressionStatement {
"expression": Bin {
"kind": "bin",
"left": Unary {
"kind": "unary",
"type": "+",
"what": Number {
"kind": "number",
"value": "20",
},
},
"right": Number {
"kind": "number",
"value": "5",
},
"type": "*",
},
"kind": "expressionstatement",
},
],
"errors": [],
"kind": "program",
}
`;

exports[`Test unary precedence with tilde 1`] = `
Program {
"children": [
ExpressionStatement {
"expression": Bin {
"kind": "bin",
"left": Unary {
"kind": "unary",
"type": "~",
"what": Number {
"kind": "number",
"value": "20",
},
},
"right": Number {
"kind": "number",
"value": "5",
},
"type": "*",
},
"kind": "expressionstatement",
},
],
"errors": [],
"kind": "program",
}
`;

exports[`Test unary simple 1`] = `
Program {
"children": [
Expand Down
5 changes: 5 additions & 0 deletions test/snapshot/unary.test.js
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Expand Up @@ -28,6 +28,11 @@ describe("Test unary", function () {
["parens (8)", "(~$var);"],
["parens (9)", "(-100);"],
["parens (10)", "-(100);"],
["precedence over mul", "-20 * 5;"],
["precedence over add", "-20 + 5;"],
["precedence over mul and add", "-20 * 5 + 10;"],
["precedence with plus", "+20 * 5;"],
["precedence with tilde", "~20 * 5;"],
])("%s", function (_, code) {
expect(parser.parseEval(code)).toMatchSnapshot();
});
Expand Down