Parameter expansion with :=, :-, etc

[k4leg]

In some cases, tree-sitter treats a word as a concatenation of a variable and a word.

Bash

#!/usr/bin/env bash

: ${ASDF:=qwer-zxcv}
: ${ASDF:=qwer}
ASDF=${ASDF:-qwer-zxcv}
: ${ASDF:?qwer+zxcv}
: ${ASDF:?qwer#zxcv}
: ${ASDF:?qwer@zxcv}
: ${ASDF:?qwer=zxcv}
: ${ASDF:+qwer-asdf}

Syntax Tree

program [0, 0] - [10, 0]
  comment [0, 0] - [0, 19]
  command [2, 0] - [2, 20]
    name: command_name [2, 0] - [2, 1]
      word [2, 0] - [2, 1]
    argument: expansion [2, 2] - [2, 20]
      variable_name [2, 4] - [2, 8]
      concatenation [2, 10] - [2, 19]
        variable_name [2, 10] - [2, 14]
        word [2, 14] - [2, 19]
  command [3, 0] - [3, 15]
    name: command_name [3, 0] - [3, 1]
      word [3, 0] - [3, 1]
    argument: expansion [3, 2] - [3, 15]
      variable_name [3, 4] - [3, 8]
      word [3, 10] - [3, 14]
  variable_assignment [4, 0] - [4, 23]
    name: variable_name [4, 0] - [4, 4]
    value: expansion [4, 5] - [4, 23]
      variable_name [4, 7] - [4, 11]
      concatenation [4, 13] - [4, 22]
        variable_name [4, 13] - [4, 17]
        word [4, 17] - [4, 22]
  command [5, 0] - [5, 20]
    name: command_name [5, 0] - [5, 1]
      word [5, 0] - [5, 1]
    argument: expansion [5, 2] - [5, 20]
      variable_name [5, 4] - [5, 8]
      concatenation [5, 10] - [5, 19]
        variable_name [5, 10] - [5, 14]
        word [5, 14] - [5, 19]
  command [6, 0] - [6, 20]
    name: command_name [6, 0] - [6, 1]
      word [6, 0] - [6, 1]
    argument: expansion [6, 2] - [6, 20]
      variable_name [6, 4] - [6, 8]
      concatenation [6, 10] - [6, 19]
        variable_name [6, 10] - [6, 14]
        word [6, 14] - [6, 19]
  command [7, 0] - [7, 20]
    name: command_name [7, 0] - [7, 1]
      word [7, 0] - [7, 1]
    argument: expansion [7, 2] - [7, 20]
      variable_name [7, 4] - [7, 8]
      concatenation [7, 10] - [7, 19]
        variable_name [7, 10] - [7, 14]
        word [7, 14] - [7, 19]
  command [8, 0] - [8, 20]
    name: command_name [8, 0] - [8, 1]
      word [8, 0] - [8, 1]
    argument: expansion [8, 2] - [8, 20]
      variable_name [8, 4] - [8, 8]
      concatenation [8, 10] - [8, 19]
        variable_name [8, 10] - [8, 14]
        word [8, 14] - [8, 19]
  command [9, 0] - [9, 20]
    name: command_name [9, 0] - [9, 1]
      word [9, 0] - [9, 1]
    argument: expansion [9, 2] - [9, 20]
      variable_name [9, 4] - [9, 8]
      concatenation [9, 10] - [9, 19]
        variable_name [9, 10] - [9, 14]
        word [9, 14] - [9, 19]