@slippy-lint/slippy/dist/rules/yul-prefer-iszero.js

A simple but powerful linter for Solidity

import { Query } from "@nomicfoundation/slang/cst";
import { ignoreLeadingTrivia } from "../slang/trivia.js";
const queries = [
    `
[YulFunctionCallExpression
  operand: [YulExpression [YulPath ["eq"]]]
  arguments: [YulArguments [YulExpression] [Comma] [YulExpression [YulLiteral ["0"]]]]
]
`,
    `
[YulFunctionCallExpression
  operand: [YulExpression [YulPath ["eq"]]]
  arguments: [YulArguments [YulExpression [YulLiteral ["0"]]] [Comma] [YulExpression]]
]
  `,
].map((query) => Query.create(query));
export const YulPreferIszero = {
    name: "yul-prefer-iszero",
    recommended: true,
    create: function () {
        return new YulPreferIszeroRule(this.name);
    },
};
class YulPreferIszeroRule {
    constructor(name) {
        this.name = name;
    }
    run({ file }) {
        const diagnostics = [];
        const cursor = file.createTreeCursor();
        const matches = cursor.query(queries);
        for (const match of matches) {
            const matchCursor = match.root.spawn();
            ignoreLeadingTrivia(matchCursor);
            diagnostics.push({
                sourceId: file.id,
                rule: this.name,
                message: "Found 'eq' comparison to 0, use 'iszero' instead",
                line: matchCursor.textRange.start.line,
                column: matchCursor.textRange.start.column,
            });
        }
        return diagnostics;
    }
}
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