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"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.arrowFunctionToExpression = arrowFunctionToExpression;
exports.arrowFunctionToShadowed = arrowFunctionToShadowed;
exports.ensureBlock = ensureBlock;
exports.toComputedKey = toComputedKey;
exports.unwrapFunctionEnvironment = unwrapFunctionEnvironment;

var _t = require("@babel/types");

var _helperFunctionName = require("@babel/helper-function-name");

const {
  arrowFunctionExpression,
  assignmentExpression,
  binaryExpression,
  blockStatement,
  callExpression,
  conditionalExpression,
  expressionStatement,
  identifier,
  isIdentifier,
  jsxIdentifier,
  memberExpression,
  metaProperty,
  numericLiteral,
  objectExpression,
  restElement,
  returnStatement,
  sequenceExpression,
  spreadElement,
  stringLiteral,
  super: _super,
  thisExpression,
  toExpression,
  unaryExpression
} = _t;

function toComputedKey() {
  let key;

  if (this.isMemberExpression()) {
    key = this.node.property;
  } else if (this.isProperty() || this.isMethod()) {
    key = this.node.key;
  } else {
    throw new ReferenceError("todo");
  }

  if (!this.node.computed) {
    if (isIdentifier(key)) key = stringLiteral(key.name);
  }

  return key;
}

function ensureBlock() {
  const body = this.get("body");
  const bodyNode = body.node;

  if (Array.isArray(body)) {
    throw new Error("Can't convert array path to a block statement");
  }

  if (!bodyNode) {
    throw new Error("Can't convert node without a body");
  }

  if (body.isBlockStatement()) {
    return bodyNode;
  }

  const statements = [];
  let stringPath = "body";
  let key;
  let listKey;

  if (body.isStatement()) {
    listKey = "body";
    key = 0;
    statements.push(body.node);
  } else {
    stringPath += ".body.0";

    if (this.isFunction()) {
      key = "argument";
      statements.push(returnStatement(body.node));
    } else {
      key = "expression";
      statements.push(expressionStatement(body.node));
    }
  }

  this.node.body = blockStatement(statements);
  const parentPath = this.get(stringPath);
  body.setup(parentPath, listKey ? parentPath.node[listKey] : parentPath.node, listKey, key);
  return this.node;
}

function arrowFunctionToShadowed() {
  if (!this.isArrowFunctionExpression()) return;
  this.arrowFunctionToExpression();
}

function unwrapFunctionEnvironment() {
  if (!this.isArrowFunctionExpression() && !this.isFunctionExpression() && !this.isFunctionDeclaration()) {
    throw this.buildCodeFrameError("Can only unwrap the environment of a function.");
  }

  hoistFunctionEnvironment(this);
}

function arrowFunctionToExpression({
  allowInsertArrow = true,
  specCompliant = false,
  noNewArrows = !specCompliant
} = {}) {
  if (!this.isArrowFunctionExpression()) {
    throw this.buildCodeFrameError("Cannot convert non-arrow function to a function expression.");
  }

  const {
    thisBinding,
    fnPath: fn
  } = hoistFunctionEnvironment(this, noNewArrows, allowInsertArrow);
  fn.ensureBlock();
  fn.node.type = "FunctionExpression";

  if (!noNewArrows) {
    const checkBinding = thisBinding ? null : fn.scope.generateUidIdentifier("arrowCheckId");

    if (checkBinding) {
      fn.parentPath.scope.push({
        id: checkBinding,
        init: objectExpression([])
      });
    }

    fn.get("body").unshiftContainer("body", expressionStatement(callExpression(this.hub.addHelper("newArrowCheck"), [thisExpression(), checkBinding ? identifier(checkBinding.name) : identifier(thisBinding)])));
    fn.replaceWith(callExpression(memberExpression((0, _helperFunctionName.default)(this, true) || fn.node, identifier("bind")), [checkBinding ? identifier(checkBinding.name) : thisExpression()]));
  }
}

function hoistFunctionEnvironment(fnPath, noNewArrows = true, allowInsertArrow = true) {
  let arrowParent;
  let thisEnvFn = fnPath.findParent(p => {
    if (p.isArrowFunctionExpression()) {
      var _arrowParent;

      (_arrowParent = arrowParent) != null ? _arrowParent : arrowParent = p;
      return false;
    }

    return p.isFunction() || p.isProgram() || p.isClassProperty({
      static: false
    }) || p.isClassPrivateProperty({
      static: false
    });
  });
  const inConstructor = thisEnvFn.isClassMethod({
    kind: "constructor"
  });

  if (thisEnvFn.isClassProperty() || thisEnvFn.isClassPrivateProperty()) {
    if (arrowParent) {
      thisEnvFn = arrowParent;
    } else if (allowInsertArrow) {
      fnPath.replaceWith(callExpression(arrowFunctionExpression([], toExpression(fnPath.node)), []));
      thisEnvFn = fnPath.get("callee");
      fnPath = thisEnvFn.get("body");
    } else {
      throw fnPath.buildCodeFrameError("Unable to transform arrow inside class property");
    }
  }

  const {
    thisPaths,
    argumentsPaths,
    newTargetPaths,
    superProps,
    superCalls
  } = getScopeInformation(fnPath);

  if (inConstructor && superCalls.length > 0) {
    if (!allowInsertArrow) {
      throw superCalls[0].buildCodeFrameError("Unable to handle nested super() usage in arrow");
    }

    const allSuperCalls = [];
    thisEnvFn.traverse({
      Function(child) {
        if (child.isArrowFunctionExpression()) return;
        child.skip();
      },

      ClassProperty(child) {
        child.skip();
      },

      CallExpression(child) {
        if (!child.get("callee").isSuper()) return;
        allSuperCalls.push(child);
      }

    });
    const superBinding = getSuperBinding(thisEnvFn);
    allSuperCalls.forEach(superCall => {
      const callee = identifier(superBinding);
      callee.loc = superCall.node.callee.loc;
      superCall.get("callee").replaceWith(callee);
    });
  }

  if (argumentsPaths.length > 0) {
    const argumentsBinding = getBinding(thisEnvFn, "arguments", () => {
      const args = () => identifier("arguments");

      if (thisEnvFn.scope.path.isProgram()) {
        return conditionalExpression(binaryExpression("===", unaryExpression("typeof", args()), stringLiteral("undefined")), thisEnvFn.scope.buildUndefinedNode(), args());
      } else {
        return args();
      }
    });
    argumentsPaths.forEach(argumentsChild => {
      const argsRef = identifier(argumentsBinding);
      argsRef.loc = argumentsChild.node.loc;
      argumentsChild.replaceWith(argsRef);
    });
  }

  if (newTargetPaths.length > 0) {
    const newTargetBinding = getBinding(thisEnvFn, "newtarget", () => metaProperty(identifier("new"), identifier("target")));
    newTargetPaths.forEach(targetChild => {
      const targetRef = identifier(newTargetBinding);
      targetRef.loc = targetChild.node.loc;
      targetChild.replaceWith(targetRef);
    });
  }

  if (superProps.length > 0) {
    if (!allowInsertArrow) {
      throw superProps[0].buildCodeFrameError("Unable to handle nested super.prop usage");
    }

    const flatSuperProps = superProps.reduce((acc, superProp) => acc.concat(standardizeSuperProperty(superProp)), []);
    flatSuperProps.forEach(superProp => {
      const key = superProp.node.computed ? "" : superProp.get("property").node.name;
      const isAssignment = superProp.parentPath.isAssignmentExpression({
        left: superProp.node
      });
      const isCall = superProp.parentPath.isCallExpression({
        callee: superProp.node
      });
      const superBinding = getSuperPropBinding(thisEnvFn, isAssignment, key);
      const args = [];

      if (superProp.node.computed) {
        args.push(superProp.get("property").node);
      }

      if (isAssignment) {
        const value = superProp.parentPath.node.right;
        args.push(value);
      }

      const call = callExpression(identifier(superBinding), args);

      if (isCall) {
        superProp.parentPath.unshiftContainer("arguments", thisExpression());
        superProp.replaceWith(memberExpression(call, identifier("call")));
        thisPaths.push(superProp.parentPath.get("arguments.0"));
      } else if (isAssignment) {
        superProp.parentPath.replaceWith(call);
      } else {
        superProp.replaceWith(call);
      }
    });
  }

  let thisBinding;

  if (thisPaths.length > 0 || !noNewArrows) {
    thisBinding = getThisBinding(thisEnvFn, inConstructor);

    if (noNewArrows || inConstructor && hasSuperClass(thisEnvFn)) {
      thisPaths.forEach(thisChild => {
        const thisRef = thisChild.isJSX() ? jsxIdentifier(thisBinding) : identifier(thisBinding);
        thisRef.loc = thisChild.node.loc;
        thisChild.replaceWith(thisRef);
      });
      if (!noNewArrows) thisBinding = null;
    }
  }

  return {
    thisBinding,
    fnPath
  };
}

function standardizeSuperProperty(superProp) {
  if (superProp.parentPath.isAssignmentExpression() && superProp.parentPath.node.operator !== "=") {
    const assignmentPath = superProp.parentPath;
    const op = assignmentPath.node.operator.slice(0, -1);
    const value = assignmentPath.node.right;
    assignmentPath.node.operator = "=";

    if (superProp.node.computed) {
      const tmp = superProp.scope.generateDeclaredUidIdentifier("tmp");
      assignmentPath.get("left").replaceWith(memberExpression(superProp.node.object, assignmentExpression("=", tmp, superProp.node.property), true));
      assignmentPath.get("right").replaceWith(binaryExpression(op, memberExpression(superProp.node.object, identifier(tmp.name), true), value));
    } else {
      assignmentPath.get("left").replaceWith(memberExpression(superProp.node.object, superProp.node.property));
      assignmentPath.get("right").replaceWith(binaryExpression(op, memberExpression(superProp.node.object, identifier(superProp.node.property.name)), value));
    }

    return [assignmentPath.get("left"), assignmentPath.get("right").get("left")];
  } else if (superProp.parentPath.isUpdateExpression()) {
    const updateExpr = superProp.parentPath;
    const tmp = superProp.scope.generateDeclaredUidIdentifier("tmp");
    const computedKey = superProp.node.computed ? superProp.scope.generateDeclaredUidIdentifier("prop") : null;
    const parts = [assignmentExpression("=", tmp, memberExpression(superProp.node.object, computedKey ? assignmentExpression("=", computedKey, superProp.node.property) : superProp.node.property, superProp.node.computed)), assignmentExpression("=", memberExpression(superProp.node.object, computedKey ? identifier(computedKey.name) : superProp.node.property, superProp.node.computed), binaryExpression("+", identifier(tmp.name), numericLiteral(1)))];

    if (!superProp.parentPath.node.prefix) {
      parts.push(identifier(tmp.name));
    }

    updateExpr.replaceWith(sequenceExpression(parts));
    const left = updateExpr.get("expressions.0.right");
    const right = updateExpr.get("expressions.1.left");
    return [left, right];
  }

  return [superProp];
}

function hasSuperClass(thisEnvFn) {
  return thisEnvFn.isClassMethod() && !!thisEnvFn.parentPath.parentPath.node.superClass;
}

function getThisBinding(thisEnvFn, inConstructor) {
  return getBinding(thisEnvFn, "this", thisBinding => {
    if (!inConstructor || !hasSuperClass(thisEnvFn)) return thisExpression();
    const supers = new WeakSet();
    thisEnvFn.traverse({
      Function(child) {
        if (child.isArrowFunctionExpression()) return;
        child.skip();
      },

      ClassProperty(child) {
        child.skip();
      },

      CallExpression(child) {
        if (!child.get("callee").isSuper()) return;
        if (supers.has(child.node)) return;
        supers.add(child.node);
        child.replaceWithMultiple([child.node, assignmentExpression("=", identifier(thisBinding), identifier("this"))]);
      }

    });
  });
}

function getSuperBinding(thisEnvFn) {
  return getBinding(thisEnvFn, "supercall", () => {
    const argsBinding = thisEnvFn.scope.generateUidIdentifier("args");
    return arrowFunctionExpression([restElement(argsBinding)], callExpression(_super(), [spreadElement(identifier(argsBinding.name))]));
  });
}

function getSuperPropBinding(thisEnvFn, isAssignment, propName) {
  const op = isAssignment ? "set" : "get";
  return getBinding(thisEnvFn, `superprop_${op}:${propName || ""}`, () => {
    const argsList = [];
    let fnBody;

    if (propName) {
      fnBody = memberExpression(_super(), identifier(propName));
    } else {
      const method = thisEnvFn.scope.generateUidIdentifier("prop");
      argsList.unshift(method);
      fnBody = memberExpression(_super(), identifier(method.name), true);
    }

    if (isAssignment) {
      const valueIdent = thisEnvFn.scope.generateUidIdentifier("value");
      argsList.push(valueIdent);
      fnBody = assignmentExpression("=", fnBody, identifier(valueIdent.name));
    }

    return arrowFunctionExpression(argsList, fnBody);
  });
}

function getBinding(thisEnvFn, key, init) {
  const cacheKey = "binding:" + key;
  let data = thisEnvFn.getData(cacheKey);

  if (!data) {
    const id = thisEnvFn.scope.generateUidIdentifier(key);
    data = id.name;
    thisEnvFn.setData(cacheKey, data);
    thisEnvFn.scope.push({
      id: id,
      init: init(data)
    });
  }

  return data;
}

function getScopeInformation(fnPath) {
  const thisPaths = [];
  const argumentsPaths = [];
  const newTargetPaths = [];
  const superProps = [];
  const superCalls = [];
  fnPath.traverse({
    ClassProperty(child) {
      child.skip();
    },

    Function(child) {
      if (child.isArrowFunctionExpression()) return;
      child.skip();
    },

    ThisExpression(child) {
      thisPaths.push(child);
    },

    JSXIdentifier(child) {
      if (child.node.name !== "this") return;

      if (!child.parentPath.isJSXMemberExpression({
        object: child.node
      }) && !child.parentPath.isJSXOpeningElement({
        name: child.node
      })) {
        return;
      }

      thisPaths.push(child);
    },

    CallExpression(child) {
      if (child.get("callee").isSuper()) superCalls.push(child);
    },

    MemberExpression(child) {
      if (child.get("object").isSuper()) superProps.push(child);
    },

    ReferencedIdentifier(child) {
      if (child.node.name !== "arguments") return;
      let curr = child.scope;

      do {
        if (curr.hasOwnBinding("arguments")) {
          curr.rename("arguments");
          return;
        }

        if (curr.path.isFunction() && !curr.path.isArrowFunctionExpression()) {
          break;
        }
      } while (curr = curr.parent);

      argumentsPaths.push(child);
    },

    MetaProperty(child) {
      if (!child.get("meta").isIdentifier({
        name: "new"
      })) return;
      if (!child.get("property").isIdentifier({
        name: "target"
      })) return;
      newTargetPaths.push(child);
    }

  });
  return {
    thisPaths,
    argumentsPaths,
    newTargetPaths,
    superProps,
    superCalls
  };
}