introspection.js #1

"use strict";

exports.__esModule = true;
exports.is = undefined;

var _getIterator2 = require("babel-runtime/core-js/get-iterator");

var _getIterator3 = _interopRequireDefault(_getIterator2);

exports.matchesPattern = matchesPattern;
exports.has = has;
exports.isStatic = isStatic;
exports.isnt = isnt;
exports.equals = equals;
exports.isNodeType = isNodeType;
exports.canHaveVariableDeclarationOrExpression = canHaveVariableDeclarationOrExpression;
exports.canSwapBetweenExpressionAndStatement = canSwapBetweenExpressionAndStatement;
exports.isCompletionRecord = isCompletionRecord;
exports.isStatementOrBlock = isStatementOrBlock;
exports.referencesImport = referencesImport;
exports.getSource = getSource;
exports.willIMaybeExecuteBefore = willIMaybeExecuteBefore;
exports._guessExecutionStatusRelativeTo = _guessExecutionStatusRelativeTo;
exports._guessExecutionStatusRelativeToDifferentFunctions = _guessExecutionStatusRelativeToDifferentFunctions;
exports.resolve = resolve;
exports._resolve = _resolve;

var _includes = require("lodash/includes");

var _includes2 = _interopRequireDefault(_includes);

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 }; }

function matchesPattern(pattern, allowPartial) {
  if (!this.isMemberExpression()) return false;

  var parts = pattern.split(".");
  var search = [this.node];
  var i = 0;

  function matches(name) {
    var part = parts[i];
    return part === "*" || name === part;
  }

  while (search.length) {
    var node = search.shift();

    if (allowPartial && i === parts.length) {
      return true;
    }

    if (t.isIdentifier(node)) {
      if (!matches(node.name)) return false;
    } else if (t.isLiteral(node)) {
      if (!matches(node.value)) return false;
    } else if (t.isMemberExpression(node)) {
      if (node.computed && !t.isLiteral(node.property)) {
        return false;
      } else {
        search.unshift(node.property);
        search.unshift(node.object);
        continue;
      }
    } else if (t.isThisExpression(node)) {
      if (!matches("this")) return false;
    } else {
      return false;
    }

    if (++i > parts.length) {
      return false;
    }
  }

  return i === parts.length;
}

function has(key) {
  var val = this.node && this.node[key];
  if (val && Array.isArray(val)) {
    return !!val.length;
  } else {
    return !!val;
  }
}

function isStatic() {
  return this.scope.isStatic(this.node);
}

var is = exports.is = has;

function isnt(key) {
  return !this.has(key);
}

function equals(key, value) {
  return this.node[key] === value;
}

function isNodeType(type) {
  return t.isType(this.type, type);
}

function canHaveVariableDeclarationOrExpression() {
  return (this.key === "init" || this.key === "left") && this.parentPath.isFor();
}

function canSwapBetweenExpressionAndStatement(replacement) {
  if (this.key !== "body" || !this.parentPath.isArrowFunctionExpression()) {
    return false;
  }

  if (this.isExpression()) {
    return t.isBlockStatement(replacement);
  } else if (this.isBlockStatement()) {
    return t.isExpression(replacement);
  }

  return false;
}

function isCompletionRecord(allowInsideFunction) {
  var path = this;
  var first = true;

  do {
    var container = path.container;

    if (path.isFunction() && !first) {
      return !!allowInsideFunction;
    }

    first = false;

    if (Array.isArray(container) && path.key !== container.length - 1) {
      return false;
    }
  } while ((path = path.parentPath) && !path.isProgram());

  return true;
}

function isStatementOrBlock() {
  if (this.parentPath.isLabeledStatement() || t.isBlockStatement(this.container)) {
    return false;
  } else {
    return (0, _includes2.default)(t.STATEMENT_OR_BLOCK_KEYS, this.key);
  }
}

function referencesImport(moduleSource, importName) {
  if (!this.isReferencedIdentifier()) return false;

  var binding = this.scope.getBinding(this.node.name);
  if (!binding || binding.kind !== "module") return false;

  var path = binding.path;
  var parent = path.parentPath;
  if (!parent.isImportDeclaration()) return false;

  if (parent.node.source.value === moduleSource) {
    if (!importName) return true;
  } else {
    return false;
  }

  if (path.isImportDefaultSpecifier() && importName === "default") {
    return true;
  }

  if (path.isImportNamespaceSpecifier() && importName === "*") {
    return true;
  }

  if (path.isImportSpecifier() && path.node.imported.name === importName) {
    return true;
  }

  return false;
}

function getSource() {
  var node = this.node;
  if (node.end) {
    return this.hub.file.code.slice(node.start, node.end);
  } else {
    return "";
  }
}

function willIMaybeExecuteBefore(target) {
  return this._guessExecutionStatusRelativeTo(target) !== "after";
}

function _guessExecutionStatusRelativeTo(target) {
  var targetFuncParent = target.scope.getFunctionParent();
  var selfFuncParent = this.scope.getFunctionParent();

  if (targetFuncParent.node !== selfFuncParent.node) {
    var status = this._guessExecutionStatusRelativeToDifferentFunctions(targetFuncParent);
    if (status) {
      return status;
    } else {
      target = targetFuncParent.path;
    }
  }

  var targetPaths = target.getAncestry();
  if (targetPaths.indexOf(this) >= 0) return "after";

  var selfPaths = this.getAncestry();

  var commonPath = void 0;
  var targetIndex = void 0;
  var selfIndex = void 0;
  for (selfIndex = 0; selfIndex < selfPaths.length; selfIndex++) {
    var selfPath = selfPaths[selfIndex];
    targetIndex = targetPaths.indexOf(selfPath);
    if (targetIndex >= 0) {
      commonPath = selfPath;
      break;
    }
  }
  if (!commonPath) {
    return "before";
  }

  var targetRelationship = targetPaths[targetIndex - 1];
  var selfRelationship = selfPaths[selfIndex - 1];
  if (!targetRelationship || !selfRelationship) {
    return "before";
  }

  if (targetRelationship.listKey && targetRelationship.container === selfRelationship.container) {
    return targetRelationship.key > selfRelationship.key ? "before" : "after";
  }

  var targetKeyPosition = t.VISITOR_KEYS[targetRelationship.type].indexOf(targetRelationship.key);
  var selfKeyPosition = t.VISITOR_KEYS[selfRelationship.type].indexOf(selfRelationship.key);
  return targetKeyPosition > selfKeyPosition ? "before" : "after";
}

function _guessExecutionStatusRelativeToDifferentFunctions(targetFuncParent) {
  var targetFuncPath = targetFuncParent.path;
  if (!targetFuncPath.isFunctionDeclaration()) return;

  var binding = targetFuncPath.scope.getBinding(targetFuncPath.node.id.name);

  if (!binding.references) return "before";

  var referencePaths = binding.referencePaths;

  for (var _iterator = referencePaths, _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 path = _ref;

    if (path.key !== "callee" || !path.parentPath.isCallExpression()) {
      return;
    }
  }

  var allStatus = void 0;

  for (var _iterator2 = referencePaths, _isArray2 = Array.isArray(_iterator2), _i2 = 0, _iterator2 = _isArray2 ? _iterator2 : (0, _getIterator3.default)(_iterator2);;) {
    var _ref2;

    if (_isArray2) {
      if (_i2 >= _iterator2.length) break;
      _ref2 = _iterator2[_i2++];
    } else {
      _i2 = _iterator2.next();
      if (_i2.done) break;
      _ref2 = _i2.value;
    }

    var _path = _ref2;

    var childOfFunction = !!_path.find(function (path) {
      return path.node === targetFuncPath.node;
    });
    if (childOfFunction) continue;

    var status = this._guessExecutionStatusRelativeTo(_path);

    if (allStatus) {
      if (allStatus !== status) return;
    } else {
      allStatus = status;
    }
  }

  return allStatus;
}

function resolve(dangerous, resolved) {
  return this._resolve(dangerous, resolved) || this;
}

function _resolve(dangerous, resolved) {
  if (resolved && resolved.indexOf(this) >= 0) return;

  resolved = resolved || [];
  resolved.push(this);

  if (this.isVariableDeclarator()) {
    if (this.get("id").isIdentifier()) {
      return this.get("init").resolve(dangerous, resolved);
    } else {}
  } else if (this.isReferencedIdentifier()) {
    var binding = this.scope.getBinding(this.node.name);
    if (!binding) return;

    if (!binding.constant) return;

    if (binding.kind === "module") return;

    if (binding.path !== this) {
      var ret = binding.path.resolve(dangerous, resolved);

      if (this.find(function (parent) {
        return parent.node === ret.node;
      })) return;
      return ret;
    }
  } else if (this.isTypeCastExpression()) {
    return this.get("expression").resolve(dangerous, resolved);
  } else if (dangerous && this.isMemberExpression()) {

    var targetKey = this.toComputedKey();
    if (!t.isLiteral(targetKey)) return;

    var targetName = targetKey.value;

    var target = this.get("object").resolve(dangerous, resolved);

    if (target.isObjectExpression()) {
      var props = target.get("properties");
      for (var _iterator3 = props, _isArray3 = Array.isArray(_iterator3), _i3 = 0, _iterator3 = _isArray3 ? _iterator3 : (0, _getIterator3.default)(_iterator3);;) {
        var _ref3;

        if (_isArray3) {
          if (_i3 >= _iterator3.length) break;
          _ref3 = _iterator3[_i3++];
        } else {
          _i3 = _iterator3.next();
          if (_i3.done) break;
          _ref3 = _i3.value;
        }

        var prop = _ref3;

        if (!prop.isProperty()) continue;

        var key = prop.get("key");

        var match = prop.isnt("computed") && key.isIdentifier({ name: targetName });

        match = match || key.isLiteral({ value: targetName });

        if (match) return prop.get("value").resolve(dangerous, resolved);
      }
    } else if (target.isArrayExpression() && !isNaN(+targetName)) {
      var elems = target.get("elements");
      var elem = elems[targetName];
      if (elem) return elem.resolve(dangerous, resolved);
    }
  }
}