knip/dist/JsonCatalogPeeker.js

Find and fix unused dependencies, exports and files in your TypeScript and JavaScript projects

import { DEFAULT_CATALOG } from "./util/catalog.js";
export class JsonCatalogPeeker {
    lines = [];
    sections = {};
    ready = false;
    fileContent;
    constructor(fileContent) {
        this.fileContent = fileContent;
    }
    init() {
        this.lines = this.fileContent.split('\n');
        let inCatalogs = false;
        let catalogName;
        let braceLevel = 0;
        for (let i = 0; i < this.lines.length; i++) {
            const line = this.lines[i];
            const trimmedLine = line.trim();
            if (catalogName) {
                if (line.includes('{'))
                    braceLevel++;
                if (line.includes('}'))
                    braceLevel--;
                if (braceLevel === 0) {
                    this.sections[catalogName].end = i;
                    catalogName = undefined;
                }
            }
            else if (trimmedLine.startsWith('"catalog":')) {
                catalogName = DEFAULT_CATALOG;
                this.sections[catalogName] = { start: i, end: 0 };
                braceLevel = (line.match(/{/g) ?? []).length - (line.match(/}/g) ?? []).length;
                if (braceLevel === 0) {
                    this.sections[catalogName].end = i;
                    catalogName = undefined;
                }
            }
            else if (trimmedLine.startsWith('"catalogs":')) {
                inCatalogs = true;
            }
            else if (inCatalogs) {
                if (trimmedLine.startsWith('}')) {
                    inCatalogs = false;
                    continue;
                }
                const match = trimmedLine.match(/"(.*?)"/);
                if (match) {
                    catalogName = match[1];
                    this.sections[catalogName] = { start: i, end: 0 };
                    braceLevel = (line.match(/{/g) ?? []).length - (line.match(/}/g) ?? []).length;
                }
            }
        }
        this.ready = true;
    }
    getLocation(parentSymbol, symbol) {
        if (!this.ready)
            this.init();
        const section = this.sections[parentSymbol];
        if (!section)
            return;
        for (let i = section.start + 1; i < section.end; i++) {
            const line = this.lines[i];
            if (line.trim().startsWith(`"${symbol}":`)) {
                return { line: i + 1, col: line.indexOf(`"${symbol}"`) + 1 };
            }
        }
    }
}