R/unpipe.R

In queryparser: Translate 'SQL' Queries into 'R' Expressions

# Copyright 2023 Cloudera Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

unpipe <- function(expr) {
  if (length(expr) == 1) {
    return(expr)
  } else {
    if (expr[[1]] == quote(`%>%`)) {
      return(as.call(append(as.list(unpipe(expr[[3]])), unpipe(expr[[2]]), after = 1)))
    } else {
      return(as.call(lapply(expr, unpipe)))
    }
  }
}