acuminous/yadda

'use strict';

var Library = require('../Library');
var $ = require('../Array');

module.exports = function (name, vocabulary) {
  var _this = this;

  // See http://github.com/acuminous/yadda#203
  this.is_language = true;

  this.library = function (dictionary) {
    return _this.localise_library(new Library(dictionary));
  };

  this.localise_library = function (library) {
    $(vocabulary._steps).each(function (keyword) {
      library[keyword] = function (signatures, fn, ctx, options) {
        return $(signatures).each(function (signature) {
          signature = prefix_signature(_this.localise(keyword), signature);
          return library.define(signature, fn, ctx, options);
        });
      };
    });
    return library;
  };

  var prefix_signature = function (prefix, signature) {
    var regex_delimiters = new RegExp('^/|/$', 'g');
    var start_of_signature = new RegExp(/^(?:\^)?/);
    var one_or_more_spaces = '\\s+';
    var leading_spaces = '^(?:\\s)*';
    return signature
      .toString()
      .replace(regex_delimiters, '')
      .replace(start_of_signature, leading_spaces + prefix + one_or_more_spaces);
  };

  this.localise = function (keyword) {
    if (vocabulary[keyword] === undefined) throw new Error('Keyword "' + keyword + '" has not been translated into ' + name + '.');
    return vocabulary[keyword];
  };
};