@jirutka/ajv-cli/lib/parsers/json.js

CLI for Ajv JSON Schema Validator with human-friendly error messages

import { evaluate as evaluateAst, parse as parseJsonAst, } from '@humanwhocodes/momoa';
const convertLocation = (loc) => ({
    line: loc.line,
    col: loc.column,
});
export function parse(input, filename, mode) {
    // NOTE: JSON.parse is faster, so we parse it using momoa only when needed.
    let jsonAst;
    let data;
    if (!mode || mode === 'json') {
        try {
            data = JSON.parse(input);
            mode = 'json';
        }
        catch (err) {
            if (mode === 'json' || !(err instanceof SyntaxError)) {
                throw err;
            }
            mode = 'jsonc';
        }
    }
    const parseOpts = { mode, ranges: false, tokens: false };
    if (mode === 'jsonc') {
        jsonAst = parseJsonAst(input, parseOpts);
        data = evaluateAst(jsonAst);
    }
    return {
        data,
        filename,
        lines: input.split('\n'),
        locate(jsonPath) {
            jsonAst ??= parseJsonAst(input, parseOpts);
            const node = getValueAtPath(jsonAst, jsonPath);
            if (node) {
                return {
                    start: convertLocation(node.loc.start),
                    end: convertLocation(node.loc.end),
                };
            }
        },
    };
}
function getValueAtPath(jsonAst, jsonPath) {
    let value = jsonAst.body;
    for (const key of jsonPath) {
        switch (value.type) {
            case 'Object': {
                const filtered = value.members.filter(member => 'value' in member.name && member.name.value === key);
                if (filtered.length !== 1) {
                    return undefined;
                }
                value = filtered[0].value;
                break;
            }
            case 'Array':
                value = value.elements[key].value;
                break;
            default:
                // This should not happen.
                throw new Error(`BUG: Unexpected object type: ${value.type}`);
        }
    }
    return value;
}
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