Function parseMaybeAssign

lib/filbert.js:1956–1996

(noIn)

  // identifier doesn't exist in this namespace yet.

  function parseMaybeAssign(noIn) {
    var left = parseMaybeTuple(noIn);
    if (tokType.isAssign) {
      var tupleArgs = getTupleArgs(left);
      if (tupleArgs) {
        next();
        var right = parseMaybeTuple(noIn);
        var blockNode = startNodeFrom(left);
        blockNode.body = unpackTuple(tupleArgs, right);
        return finishNode(blockNode, "BlockStatement");
      }

      if (scope.isClass()) {
        var thisExpr = nc.createNodeFrom(left, "ThisExpression");
        left = nc.createNodeFrom(left, "MemberExpression", { object: thisExpr, property: left });
      }

      var node = startNodeFrom(left);
      node.operator = tokVal;
      node.left = left;
      next();
      node.right = parseMaybeTuple(noIn);
      checkLVal(left);

      if (node.operator === '+=' || node.operator === '*=') {
        var right = nc.createNodeSpan(node.right, node.right, "CallExpression");
        right.callee = nc.createNodeOpsCallee(right, node.operator === '+=' ? "add" : "multiply");
        right.arguments = [left, node.right];
        node.right = right;
        node.operator = '=';
      }

      if (left.type === "Identifier" && !scope.exists(left.name)) {
        if (!node.operator || node.operator.length > 1) unexpected();
        scope.addVar(left.name);
        return nc.createVarDeclFromId(node.left, node.left, node.right);
      }
      return finishNode(node, "AssignmentExpression");
    }
    return left;
  }

  // Parse a tuple