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/home/yanggyein/yanggyein/yang_home/node_modules/ajv/lib/compile/util.js

'use strict';

module.exports = {
  copy: copy,
  checkDataType: checkDataType,
  checkDataTypes: checkDataTypes,
  coerceToTypes: coerceToTypes,
  toHash: toHash,
  getProperty: getProperty,
  escapeQuotes: escapeQuotes,
  equal: require('fast-deep-equal'),
  ucs2length: require('./ucs2length'),
  varOccurences: varOccurences,
  varReplace: varReplace,
  schemaHasRules: schemaHasRules,
  schemaHasRulesExcept: schemaHasRulesExcept,
  schemaUnknownRules: schemaUnknownRules,
  toQuotedString: toQuotedString,
  getPathExpr: getPathExpr,
  getPath: getPath,
  getData: getData,
  unescapeFragment: unescapeFragment,
  unescapeJsonPointer: unescapeJsonPointer,
  escapeFragment: escapeFragment,
  escapeJsonPointer: escapeJsonPointer
};

function copy(o, to) {
  to = to || {};
  for (var key in o) to[key] = o[key];
  return to;
}

function checkDataType(dataType, data, strictNumbers, negate) {
  var EQUAL = negate ? ' !== ' : ' === '
    , AND = negate ? ' || ' : ' && '
    , OK = negate ? '!' : ''
    , NOT = negate ? '' : '!';
  switch (dataType) {
    case 'null': return data + EQUAL + 'null';
    case 'array': return OK + 'Array.isArray(' + data + ')';
    case 'object': return '(' + OK + data + AND +
                          'typeof ' + data + EQUAL + '"object"' + AND +
                          NOT + 'Array.isArray(' + data + '))';
    case 'integer': return '(typeof ' + data + EQUAL + '"number"' + AND +
                           NOT + '(' + data + ' % 1)' +
                           AND + data + EQUAL + data +
                           (strictNumbers ? (AND + OK + 'isFinite(' + data + ')') : '') + ')';
    case 'number': return '(typeof ' + data + EQUAL + '"' + dataType + '"' +
                          (strictNumbers ? (AND + OK + 'isFinite(' + data + ')') : '') + ')';
    default: return 'typeof ' + data + EQUAL + '"' + dataType + '"';
  }
}

function checkDataTypes(dataTypes, data, strictNumbers) {
  switch (dataTypes.length) {
    case 1: return checkDataType(dataTypes[0], data, strictNumbers, true);
    default:
      var code = '';
      var types = toHash(dataTypes);
      if (types.array && types.object) {
        code = types.null ? '(': '(!' + data + ' || ';
        code += 'typeof ' + data + ' !== "object")';
        delete types.null;
        delete types.array;
        delete types.object;
      }
      if (types.number) delete types.integer;
      for (var t in types)
        code += (code ? ' && ' : '' ) + checkDataType(t, data, strictNumbers, true);

return code;
  }
}

function toHash(arr) {
  var hash = {};
  for (var i=0; i<arr.length; i++) hash[arr[i]] = true;
  return hash;
}

var IDENTIFIER = /^[a-z$_][a-z$_0-9]*$/i;
var SINGLE_QUOTE = /'|\\/g;
function getProperty(key) {
  return typeof key == 'number'
          ? '[' + key + ']'
          : IDENTIFIER.test(key)
            ? '.' + key
            : "['" + escapeQuotes(key) + "']";
}

function escapeQuotes(str) {
  return str.replace(SINGLE_QUOTE, '\\$&')
            .replace(/\n/g, '\\n')
            .replace(/\r/g, '\\r')
            .replace(/\f/g, '\\f')
            .replace(/\t/g, '\\t');
}

function varOccurences(str, dataVar) {
  dataVar += '[^0-9]';
  var matches = str.match(new RegExp(dataVar, 'g'));
  return matches ? matches.length : 0;
}

function varReplace(str, dataVar, expr) {
  dataVar += '([^0-9])';
  expr = expr.replace(/\$/g, '$$$$');
  return str.replace(new RegExp(dataVar, 'g'), expr + '$1');
}

function schemaHasRules(schema, rules) {
  if (typeof schema == 'boolean') return !schema;
  for (var key in schema) if (rules[key]) return true;
}

function schemaHasRulesExcept(schema, rules, exceptKeyword) {
  if (typeof schema == 'boolean') return !schema && exceptKeyword != 'not';
  for (var key in schema) if (key != exceptKeyword && rules[key]) return true;
}

function schemaUnknownRules(schema, rules) {
  if (typeof schema == 'boolean') return;
  for (var key in schema) if (!rules[key]) return key;
}

function toQuotedString(str) {
  return '\'' + escapeQuotes(str) + '\'';
}

function getPathExpr(currentPath, expr, jsonPointers, isNumber) {
  var path = jsonPointers // false by default
              ? '\'/\' + ' + expr + (isNumber ? '' : '.replace(/~/g, \'~0\').replace(/\\//g, \'~1\')')
              : (isNumber ? '\'[\' + ' + expr + ' + \']\'' : '\'[\\\'\' + ' + expr + ' + \'\\\']\'');
  return joinPaths(currentPath, path);
}

function getPath(currentPath, prop, jsonPointers) {
  var path = jsonPointers // false by default
              ? toQuotedString('/' + escapeJsonPointer(prop))
              : toQuotedString(getProperty(prop));
  return joinPaths(currentPath, path);
}

var JSON_POINTER = /^\/(?:[^~]|~0|~1)*$/;
var RELATIVE_JSON_POINTER = /^([0-9]+)(#|\/(?:[^~]|~0|~1)*)?$/;
function getData($data, lvl, paths) {
  var up, jsonPointer, data, matches;
  if ($data === '') return 'rootData';
  if ($data[0] == '/') {
    if (!JSON_POINTER.test($data)) throw new Error('Invalid JSON-pointer: ' + $data);
    jsonPointer = $data;
    data = 'rootData';
  } else {
    matches = $data.match(RELATIVE_JSON_POINTER);
    if (!matches) throw new Error('Invalid JSON-pointer: ' + $data);
    up = +matches[1];
    jsonPointer = matches[2];
    if (jsonPointer == '#') {
      if (up >= lvl) throw new Error('Cannot access property/index ' + up + ' levels up, current level is ' + lvl);
      return paths[lvl - up];
    }

if (up > lvl) throw new Error('Cannot access data ' + up + ' levels up, current level is ' + lvl);
    data = 'data' + ((lvl - up) || '');
    if (!jsonPointer) return data;
  }

var expr = data;
  var segments = jsonPointer.split('/');
  for (var i=0; i<segments.length; i++) {
    var segment = segments[i];
    if (segment) {
      data += getProperty(unescapeJsonPointer(segment));
      expr += ' && ' + data;
    }
  }
  return expr;
}

function joinPaths (a, b) {
  if (a == '""') return b;
  return (a + ' + ' + b).replace(/([^\\])' \+ '/g, '$1');
}

function unescapeFragment(str) {
  return unescapeJsonPointer(decodeURIComponent(str));
}

function escapeFragment(str) {
  return encodeURIComponent(escapeJsonPointer(str));
}

function escapeJsonPointer(str) {
  return str.replace(/~/g, '~0').replace(/\//g, '~1');
}

function unescapeJsonPointer(str) {
  return str.replace(/~1/g, '/').replace(/~0/g, '~');
}