textlint-rule-editorconfig/ini.js

Let EditorConfig and Textlint works together.

// Based on [ini](https://github.com/npm/ini) by Isaac Z. Schlueter <i@izs.me> (http://blog.izs.me/).
// Modified, cause here we need to know each section's priority.

'use strict';

exports.parse = exports.decode = decode;
exports.stringify = exports.encode = encode;

exports.safe = safe;
exports.unsafe = unsafe;

const eol = process.platform === 'win32' ? '\r\n' : '\n';

function encode(obj, opt) {
  const children = [];
  let out = '';

  if (typeof opt === 'string') {
    opt = {
      section: opt,
      whitespace: false
    };
  } else {
    opt = opt || {};
    opt.whitespace = opt.whitespace === true;
  }

  const separator = opt.whitespace ? ' = ' : '=';

  Object.keys(obj).forEach(function (k) {
    const val = obj[k];
    if (val && Array.isArray(val)) {
      val.forEach(function (item) {
        out += safe(k + '[]') + separator + safe(item) + '\n';
      });
    } else if (val && typeof val === 'object') {
      children.push(k);
    } else {
      out += safe(k) + separator + safe(val) + eol;
    }
  });

  if (opt.section && out.length) {
    out = '[' + safe(opt.section) + ']' + eol + out;
  }

  children.forEach(function (k) {
    const nk = dotSplit(k).join('\\.');
    const section = (opt.section ? opt.section + '.' : '') + nk;
    const child = encode(obj[k], {
      section: section,
      whitespace: opt.whitespace
    });
    if (out.length && child.length) {
      out += eol;
    }
    out += child;
  });

  return out;
}

function dotSplit(str) {
  return str.replace(/\1/g, '\u0002LITERAL\\1LITERAL\u0002')
    .replace(/\\\./g, '\u0001')
    .split(/\./).map(function (part) {
      return part.replace(/\1/g, '\\.')
      .replace(/\2LITERAL\\1LITERAL\2/g, '\u0001');
    });
}

function decode(str) {
  const out = Object.create(null);
  let p = out;
  let section = null;
  //            section     |key      = value
  const re = /^\[([^\]]*)\]$|^([^=]+)(=(.*))?$/i;
  const lines = str.split(/[\r\n]+/g);

  lines.forEach(function (line, lineIndex) {
    if (!line || line.match(/^\s*[;#]/)) {
      return;
    }
    const match = line.match(re);
    if (!match) {
      return;
    }
    if (match[1] !== undefined) {
      section = unsafe(match[1]);
      p = out[section] = out[section] || {};
      p._priority = lineIndex;
      return;
    }
    let key = unsafe(match[2]);
    let value = match[3] ? unsafe((match[4] || '')) : true;

    if (value === 'true') {
      value = true;
    } else if (value === 'false') {
      value = false;
    } else if (value === 'null') {
      value = null;
    }

    // Convert keys with '[]' suffix to an array
    if (key.length > 2 && key.slice(-2) === '[]') {
      key = key.substring(0, key.length - 2);
      if (!p[key]) {
        p[key] = [];
      } else if (!Array.isArray(p[key])) {
        p[key] = [p[key]];
      }
    }

    // safeguard against resetting a previously defined
    // array by accidentally forgetting the brackets
    if (Array.isArray(p[key])) {
      p[key].push(value);
    } else {
      p[key] = value;
    }
  });

  /*
  // {a:{y:1},"a.b":{x:2}} --> {a:{y:1,b:{x:2}}}
  // use a filter to return the keys that have to be deleted.
  Object.keys(out).filter(function (k) {
    if (!out[k] ||
      typeof out[k] !== 'object' ||
      Array.isArray(out[k])) {
      return false;
    }
    // see if the parent section is also an object.
    // if so, add it to that, and mark this one for deletion
    const parts = dotSplit(k);
    let p = out;
    const l = parts.pop();
    const nl = l.replace(/\\\./g, '.');
    parts.forEach(function (part) {
      if (!p[part] || typeof p[part] !== 'object') {
        p[part] = {};
      }
      p = p[part];
    });
    if (p === out && nl === l) {
      return false;
    }
    p[nl] = out[k];
    return true;
  }).forEach(function (del) {
    delete out[del];
  });
  */

  return out;
}

function isQuoted(val) {
  return (val.charAt(0) === '"' && val.slice(-1) === '"') ||
    (val.charAt(0) === "'" && val.slice(-1) === "'");
}

function safe(val) {
  return (typeof val !== 'string' ||
    val.match(/[=\r\n]/) ||
    val.match(/^\[/) ||
    (val.length > 1 &&
     isQuoted(val)) ||
    val !== val.trim()) ?
      JSON.stringify(val) :
      val.replace(/;/g, '\\;').replace(/#/g, '\\#');
}

function unsafe(val) {
  val = (val || '').trim();
  if (isQuoted(val)) {
    // remove the single quotes before calling JSON.parse
    if (val.charAt(0) === "'") {
      val = val.substr(1, val.length - 2);
    }
    try {
      val = JSON.parse(val);
    } catch (_) {}
  } else {
    // walk the val to find the first not-escaped ; character
    let esc = false;
    let unesc = '';
    for (let i = 0, l = val.length; i < l; i++) {
      const c = val.charAt(i);
      if (esc) {
        if ('\\;#'.indexOf(c) === -1) {
          unesc += '\\' + c;
        } else {
          unesc += c;
        }
        esc = false;
      } else if (';#'.indexOf(c) !== -1) {
        break;
      } else if (c === '\\') {
        esc = true;
      } else {
        unesc += c;
      }
    }
    if (esc) {
      unesc += '\\';
    }
    return unesc;
  }
  return val;
}