read_map

Read file as map

Map[String, String] read_map(File)

Reads a tab-separated value (TSV) file representing a set of pairs. Each row must have exactly two columns, e.g., col1\tcol2. Trailing end-of-line characters (\r and \n) are removed from each line.

Each pair is added to a Map[String, String] in order. The values in the first column must be unique; if there are any duplicate keys, an error is raised.

If the file is empty, an empty map is returned.

Parameters

  1. File: Path of the two-column TSV file to read.

Returns: A Map[String, String], with one element for each row in the TSV file.

Example: read_map_task.wdl

version 1.2

task read_map {
  command <<<
    printf "key1\tvalue1\n"
    printf "key2\tvalue2\n"
  >>>
  
  output {
    Map[String, String] mapping = read_map(stdout())
  }
}

Example input:

{}

Example output:

{
  "read_map.mapping": {
    "key1": "value1",
    "key2": "value2"
  }
}