Code coverage report for 6to5/file.js

Statements: 96.58% (113 / 117)      Branches: 86.96% (40 / 46)      Functions: 100% (15 / 15)      Lines: 97.37% (111 / 114)      Ignored: none     

All files » 6to5/ » file.js
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module.exports = File;
 
var SHEBANG_REGEX = /^\#\!.*/;
 
var transform = require("./transformation/transform");
var generate  = require("./generation/generator");
var Scope     = require("./traverse/scope");
var util      = require("./util");
var t         = require("./types");
var _         = require("lodash");
 
function File(opts) {
  this.opts = File.normaliseOptions(opts);
  this.uids = {};
  this.ast  = {};
}
 
File.declarations = [
  "extends",
  "class-props",
  "apply-constructor",
  "tagged-template-literal",
  "interop-require",
  "to-array",
  "object-spread",
  "has-own",
  "slice"
];
 
File.normaliseOptions = function (opts) {
  opts = _.cloneDeep(opts || {});
 
  _.defaults(opts, {
    experimental: false,
    playground:   false,
    whitespace:   true,
    blacklist:    [],
    whitelist:    [],
    sourceMap:    false,
    comments:     true,
    filename:     "unknown",
    modules:      "common",
    runtime:      false,
    code:         true
  });
 
  // normalise windows path separators to unix
  opts.filename = opts.filename.replace(/\\/g, "/");
 
  opts.blacklist = util.arrayify(opts.blacklist);
  opts.whitelist = util.arrayify(opts.whitelist);
 
  _.defaults(opts, {
    moduleRoot: opts.sourceRoot
  });
 
  _.defaults(opts, {
    sourceRoot: opts.moduleRoot
  });
 
  _.defaults(opts, {
    filenameRelative: opts.filename
  });
 
  _.defaults(opts, {
    sourceFileName: opts.filenameRelative,
    sourceMapName:  opts.filenameRelative
  });
 
  if (opts.runtime === true) {
    opts.runtime = "to5Runtime";
  }
 
  if (opts.playground) {
    opts.experimental = true;
  }
 
  transform._ensureTransformerNames("blacklist", opts.blacklist);
  transform._ensureTransformerNames("whitelist", opts.whitelist);
 
  return opts;
};
 
File.prototype.toArray = function (node) {
  if (t.isArrayExpression(node)) {
    return node;
  } else if (t.isIdentifier(node) && node.name === "arguments") {
    return t.callExpression(t.memberExpression(this.addDeclaration("slice"), t.identifier("call")), [node]);
  } else {
    return t.callExpression(this.addDeclaration("to-array"), [node]);
  }
};
 
File.prototype.getModuleFormatter = function (type) {
  var ModuleFormatter = _.isFunction(type) ? type : transform.moduleFormatters[type];
 
  Iif (!ModuleFormatter) {
    var loc = util.resolve(type);
    if (loc) ModuleFormatter = require(loc);
  }
 
  Iif (!ModuleFormatter) {
    throw new ReferenceError("unknown module formatter type " + type);
  }
 
  return new ModuleFormatter(this);
};
 
File.prototype.parseShebang = function (code) {
  var shebangMatch = code.match(SHEBANG_REGEX);
  if (shebangMatch) {
    this.shebang = shebangMatch[0];
 
    // remove shebang
    code = code.replace(SHEBANG_REGEX, "");
  }
 
  return code;
};
 
File.prototype.addDeclaration = function (name) {
  if (!_.contains(File.declarations, name)) {
    throw new ReferenceError("unknown declaration " + name);
  }
 
  var program = this.ast.program;
 
  var declar = program._declarations && program._declarations[name];
  if (declar) return declar.id;
 
  var ref;
  var runtimeNamespace = this.opts.runtime;
  if (runtimeNamespace) {
    name = t.identifier(t.toIdentifier(name));
    return t.memberExpression(t.identifier(runtimeNamespace), name);
  } else {
    ref = util.template(name);
  }
 
  var uid = this.generateUidIdentifier(name);
  this.scope.push({
    key: name,
    id: uid,
    init: ref
  });
  return uid;
};
 
File.prototype.errorWithNode = function (node, msg, Error) {
  Error = Error || SyntaxError;
 
  var loc = node.loc.start;
  var err = new Error("Line " + loc.line + ": " + msg);
  err.loc = loc;
  return err;
};
 
File.prototype.parse = function (code) {
  code = (code || "") + "";
 
  var self = this;
 
  this.code = code;
 
  code = this.parseShebang(code);
 
  return util.parse(this.opts, code, function (tree) {
    self.transform(tree);
    return self.generate();
  });
};
 
File.prototype.transform = function (ast) {
  this.ast = ast;
  this.scope = new Scope(ast.program);
  this.moduleFormatter = this.getModuleFormatter(this.opts.modules);
 
  var self = this;
 
  _.each(transform.transformers, function (transformer) {
    transformer.transform(self);
  });
};
 
File.prototype.generate = function () {
  var opts = this.opts;
  var ast  = this.ast;
 
  if (!opts.code) {
    return {
      code: "",
      map:  null,
      ast:  ast
    };
  }
 
  var result = generate(ast, opts, this.code);
 
  if (this.shebang) {
    // add back shebang
    result.code = this.shebang + "\n" + result.code;
  }
 
  if (opts.sourceMap === "inline") {
    result.code += "\n" + util.sourceMapToComment(result.map);
  }
 
  result.ast = result;
 
  return result;
};
 
File.prototype.generateUid = function (name, scope) {
  name = t.toIdentifier(name);
 
  scope = scope || this.scope;
 
  var uid;
  do {
    uid = this._generateUid(name);
  } while (scope.has(uid));
  return uid;
};
 
File.prototype.generateUidIdentifier = function (name, scope) {
  return t.identifier(this.generateUid(name, scope));
};
 
File.prototype._generateUid = function (name) {
  var uids = this.uids;
  var i = uids[name] || 1;
 
  var id = name;
  if (i > 1) id += i;
  uids[name] = i + 1;
  return "_" + id;
};