@slippy-lint/slippy/dist/rules/imports-on-top.js

A simple but powerful linter for Solidity

import { NonterminalKind, TerminalKind } from "@nomicfoundation/slang/cst";
export const ImportsOnTop = {
    name: "imports-on-top",
    recommended: true,
    create: function () {
        return new ImportsOnTopRule(this.name);
    },
};
class ImportsOnTopRule {
    constructor(name) {
        this.name = name;
    }
    run({ file }) {
        const diagnostics = [];
        const cursor = file.createTreeCursor();
        let hasSeenNonImport = false;
        while (cursor.goToNextNonterminalWithKind(NonterminalKind.SourceUnitMember)) {
            if (!cursor.goToFirstChild()) {
                continue;
            }
            if (cursor.node.kind === NonterminalKind.ImportDirective) {
                if (hasSeenNonImport) {
                    cursor.goToNextTerminalWithKind(TerminalKind.ImportKeyword);
                    // If we have seen a non-import directive before this import,
                    diagnostics.push({
                        rule: this.name,
                        message: "Imports should be at the top of the file.",
                        sourceId: file.id,
                        line: cursor.textRange.start.line,
                        column: cursor.textRange.start.column,
                    });
                }
            }
            else if (cursor.node.kind !== NonterminalKind.PragmaDirective) {
                hasSeenNonImport = true;
            }
        }
        return diagnostics;
    }
}
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