led: function()

in MultiRegion/2_UI/src/assets/js/aws/aws-cognito-sdk.js [14228:14305]
78 lines of code
22 McCabe index (conditional complexity)

      led: function(tokenName, left) {
        var right;
        switch(tokenName) {
          case TOK_DOT:
            var rbp = bindingPower.Dot;
            if (this._lookahead(0) !== TOK_STAR) {
                right = this._parseDotRHS(rbp);
                return {type: "Subexpression", children: [left, right]};
            } else {
                this._advance();
                right = this._parseProjectionRHS(rbp);
                return {type: "ValueProjection", children: [left, right]};
            }
            break;
          case TOK_PIPE:
            right = this.expression(bindingPower.Pipe);
            return {type: TOK_PIPE, children: [left, right]};
          case TOK_OR:
            right = this.expression(bindingPower.Or);
            return {type: "OrExpression", children: [left, right]};
          case TOK_AND:
            right = this.expression(bindingPower.And);
            return {type: "AndExpression", children: [left, right]};
          case TOK_LPAREN:
            var name = left.name;
            var args = [];
            var expression, node;
            while (this._lookahead(0) !== TOK_RPAREN) {
              if (this._lookahead(0) === TOK_CURRENT) {
                expression = {type: TOK_CURRENT};
                this._advance();
              } else {
                expression = this.expression(0);
              }
              if (this._lookahead(0) === TOK_COMMA) {
                this._match(TOK_COMMA);
              }
              args.push(expression);
            }
            this._match(TOK_RPAREN);
            node = {type: "Function", name: name, children: args};
            return node;
          case TOK_FILTER:
            var condition = this.expression(0);
            this._match(TOK_RBRACKET);
            if (this._lookahead(0) === TOK_FLATTEN) {
              right = {type: "Identity"};
            } else {
              right = this._parseProjectionRHS(bindingPower.Filter);
            }
            return {type: "FilterProjection", children: [left, right, condition]};
          case TOK_FLATTEN:
            var leftNode = {type: TOK_FLATTEN, children: [left]};
            var rightNode = this._parseProjectionRHS(bindingPower.Flatten);
            return {type: "Projection", children: [leftNode, rightNode]};
          case TOK_EQ:
          case TOK_NE:
          case TOK_GT:
          case TOK_GTE:
          case TOK_LT:
          case TOK_LTE:
            return this._parseComparator(left, tokenName);
          case TOK_LBRACKET:
            var token = this._lookaheadToken(0);
            if (token.type === TOK_NUMBER || token.type === TOK_COLON) {
                right = this._parseIndexExpression();
                return this._projectIfSlice(left, right);
            } else {
                this._match(TOK_STAR);
                this._match(TOK_RBRACKET);
                right = this._parseProjectionRHS(bindingPower.Star);
                return {type: "Projection", children: [left, right]};
            }
            break;
          default:
            this._errorToken(this._lookaheadToken(0));
        }
      },