diff options
Diffstat (limited to 'node_modules/babel-plugin-transform-es2015-parameters/lib/default.js')
| -rw-r--r-- | node_modules/babel-plugin-transform-es2015-parameters/lib/default.js | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/node_modules/babel-plugin-transform-es2015-parameters/lib/default.js b/node_modules/babel-plugin-transform-es2015-parameters/lib/default.js new file mode 100644 index 0000000..f0d982f --- /dev/null +++ b/node_modules/babel-plugin-transform-es2015-parameters/lib/default.js @@ -0,0 +1,162 @@ +"use strict"; + +exports.__esModule = true; +exports.visitor = undefined; + +var _getIterator2 = require("babel-runtime/core-js/get-iterator"); + +var _getIterator3 = _interopRequireDefault(_getIterator2); + +var _babelHelperGetFunctionArity = require("babel-helper-get-function-arity"); + +var _babelHelperGetFunctionArity2 = _interopRequireDefault(_babelHelperGetFunctionArity); + +var _babelHelperCallDelegate = require("babel-helper-call-delegate"); + +var _babelHelperCallDelegate2 = _interopRequireDefault(_babelHelperCallDelegate); + +var _babelTemplate = require("babel-template"); + +var _babelTemplate2 = _interopRequireDefault(_babelTemplate); + +var _babelTypes = require("babel-types"); + +var t = _interopRequireWildcard(_babelTypes); + +function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } } + +function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; } + +var buildDefaultParam = (0, _babelTemplate2.default)("\n let VARIABLE_NAME =\n ARGUMENTS.length > ARGUMENT_KEY && ARGUMENTS[ARGUMENT_KEY] !== undefined ?\n ARGUMENTS[ARGUMENT_KEY]\n :\n DEFAULT_VALUE;\n"); + +var buildCutOff = (0, _babelTemplate2.default)("\n let $0 = $1[$2];\n"); + +function hasDefaults(node) { + for (var _iterator = node.params, _isArray = Array.isArray(_iterator), _i = 0, _iterator = _isArray ? _iterator : (0, _getIterator3.default)(_iterator);;) { + var _ref; + + if (_isArray) { + if (_i >= _iterator.length) break; + _ref = _iterator[_i++]; + } else { + _i = _iterator.next(); + if (_i.done) break; + _ref = _i.value; + } + + var param = _ref; + + if (!t.isIdentifier(param)) return true; + } + return false; +} + +function isSafeBinding(scope, node) { + if (!scope.hasOwnBinding(node.name)) return true; + + var _scope$getOwnBinding = scope.getOwnBinding(node.name), + kind = _scope$getOwnBinding.kind; + + return kind === "param" || kind === "local"; +} + +var iifeVisitor = { + ReferencedIdentifier: function ReferencedIdentifier(path, state) { + var scope = path.scope, + node = path.node; + + if (node.name === "eval" || !isSafeBinding(scope, node)) { + state.iife = true; + path.stop(); + } + }, + Scope: function Scope(path) { + path.skip(); + } +}; + +var visitor = exports.visitor = { + Function: function Function(path) { + var node = path.node, + scope = path.scope; + + if (!hasDefaults(node)) return; + + path.ensureBlock(); + + var state = { + iife: false, + scope: scope + }; + + var body = []; + + var argsIdentifier = t.identifier("arguments"); + argsIdentifier._shadowedFunctionLiteral = path; + + function pushDefNode(left, right, i) { + var defNode = buildDefaultParam({ + VARIABLE_NAME: left, + DEFAULT_VALUE: right, + ARGUMENT_KEY: t.numericLiteral(i), + ARGUMENTS: argsIdentifier + }); + defNode._blockHoist = node.params.length - i; + body.push(defNode); + } + + var lastNonDefaultParam = (0, _babelHelperGetFunctionArity2.default)(node); + + var params = path.get("params"); + for (var i = 0; i < params.length; i++) { + var param = params[i]; + + if (!param.isAssignmentPattern()) { + if (!state.iife && !param.isIdentifier()) { + param.traverse(iifeVisitor, state); + } + + continue; + } + + var left = param.get("left"); + var right = param.get("right"); + + if (i >= lastNonDefaultParam || left.isPattern()) { + var placeholder = scope.generateUidIdentifier("x"); + placeholder._isDefaultPlaceholder = true; + node.params[i] = placeholder; + } else { + node.params[i] = left.node; + } + + if (!state.iife) { + if (right.isIdentifier() && !isSafeBinding(scope, right.node)) { + state.iife = true; + } else { + right.traverse(iifeVisitor, state); + } + } + + pushDefNode(left.node, right.node, i); + } + + for (var _i2 = lastNonDefaultParam + 1; _i2 < node.params.length; _i2++) { + var _param = node.params[_i2]; + if (_param._isDefaultPlaceholder) continue; + + var declar = buildCutOff(_param, argsIdentifier, t.numericLiteral(_i2)); + declar._blockHoist = node.params.length - _i2; + body.push(declar); + } + + node.params = node.params.slice(0, lastNonDefaultParam); + + if (state.iife) { + body.push((0, _babelHelperCallDelegate2.default)(path, scope)); + path.set("body", t.blockStatement(body)); + } else { + path.get("body").unshiftContainer("body", body); + } + } +};
\ No newline at end of file |