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classifieur
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'use strict';

module.exports = function defFunc(ajv) {
  defFunc.definition = {
    type: 'object',
    inline: function (it, keyword, schema) {
      var expr = '';
      for (var i=0; i<schema.length; i++) {
        if (i) expr += ' && ';
        expr += '(' + getData(schema[i], it.dataLevel) + ' !== undefined)';
      }
      return expr;
    },
    metaSchema: {
      type: 'array',
      items: {
        type: 'string',
        format: 'json-pointer'
      }
    }
  };

  ajv.addKeyword('deepRequired', defFunc.definition);
  return ajv;
};


function getData(jsonPointer, lvl) {
  var data = 'data' + (lvl || '');
  if (!jsonPointer) return data;

  var expr = data;
  var segments = jsonPointer.split('/');
  for (var i=1; i<segments.length; i++) {
    var segment = segments[i];
    data += getProperty(unescapeJsonPointer(segment));
    expr += ' && ' + data;
  }
  return expr;
}


var IDENTIFIER = /^[a-z$_][a-z$_0-9]*$/i;
var INTEGER = /^[0-9]+$/;
var SINGLE_QUOTE = /'|\\/g;
function getProperty(key) {
  return INTEGER.test(key)
          ? '[' + key + ']'
          : IDENTIFIER.test(key)
            ? '.' + key
            : "['" + key.replace(SINGLE_QUOTE, '\\$&') + "']";
}


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