---
test case: valid key with no parameters
in:
  key: 'key'
out:
  valid_part: 'key'
  invalid_part: ''
  return: 'SUCCEED'
---
test case: valid key with empty brackets
in:
  key: 'key[]'
out:
  valid_part: 'key[]'
  invalid_part: ''
  return: 'SUCCEED'
---
test case: valid key with quoted empty string in brackets
in:
  key: 'key[""]'
out:
  valid_part: 'key[""]'
  invalid_part: ''
  return: 'SUCCEED'
---
test case: valid key with space in brackets
in:
  key: 'key[ ]'
out:
  valid_part: 'key[ ]'
  invalid_part: ''
  return: 'SUCCEED'
---
test case: valid key with leading space before quoted empty string in brackets
in:
  key: 'key[ ""]'
out:
  valid_part: 'key[ ""]'
  invalid_part: ''
  return: 'SUCCEED'
---
test case: valid key with leading and trailing spaces around quoted empty string in brackets
in:
  key: 'key[ "" ]'
out:
  valid_part: 'key[ "" ]'
  invalid_part: ''
  return: 'SUCCEED'
---
test case: valid key with 'a' in brackets
in:
  key: 'key[a]'
out:
  valid_part: 'key[a]'
  invalid_part: ''
  return: 'SUCCEED'
---
test case: valid key with leading space before 'a' in brackets
in:
  key: 'key[ a]'
out:
  valid_part: 'key[ a]'
  invalid_part: ''
  return: 'SUCCEED'
---
test case: valid key with leading and trailing spaces around 'a' in brackets
in:
  key: 'key[ a ]'
out:
  valid_part: 'key[ a ]'
  invalid_part: ''
  return: 'SUCCEED'
---
test case: valid key with quoted 'a' in brackets
in:
  key: 'key["a"]'
out:
  valid_part: 'key["a"]'
  invalid_part: ''
  return: 'SUCCEED'
---
test case: valid key with quoted 'a' followed by comma in brackets
in:
  key: 'key["a",]'
out:
  valid_part: 'key["a",]'
  invalid_part: ''
  return: 'SUCCEED'
---
test case: valid key with unquoted 'a' followed by comma in brackets
in:
  key: 'key[a,]'
out:
  valid_part: 'key[a,]'
  invalid_part: ''
  return: 'SUCCEED'
---
test case: valid key with multiple unquoted parameters in brackets
in:
  key: 'key[a,b,c]'
out:
  valid_part: 'key[a,b,c]'
  invalid_part: ''
  return: 'SUCCEED'
---
test case: valid key with multiple quoted parameters in brackets
in:
  key: 'key["a","b","c"]'
out:
  valid_part: 'key["a","b","c"]'
  invalid_part: ''
  return: 'SUCCEED'
---
test case: valid key with first unquoted parameter and second array parameter containing two unquoted parameters
in:
  key: 'key[a,[b,c]]'
out:
  valid_part: 'key[a,[b,c]]'
  invalid_part: ''
  return: 'SUCCEED'
---
test case: valid key with first unquoted parameter and second array parameter containing unquoted and empty parameter
in:
  key: 'key[a,[b,]]'
out:
  valid_part: 'key[a,[b,]]'
  invalid_part: ''
  return: 'SUCCEED'
---
test case: valid key with two unquoted parameters where second parameter contains opening square bracket
in:
  key: 'key[a,b[c]'
out:
  valid_part: 'key[a,b[c]'
  invalid_part: ''
  return: 'SUCCEED'
---
test case: valid key with multiple quoted parameters and array  # array contains multiple quoted parameters which containing escaping and characters that are not allowed in unquoted parameters
in:
  key: 'key["a","b",["c","d\",]"]]'
out:
  valid_part: 'key["a","b",["c","d\",]"]]'
  invalid_part: ''
  return: 'SUCCEED'
---
test case: valid key with multiple quoted parameters and multiple arrays        # arrays contains multiple unquoted and quoted parameters which containing escaping and characters that are not allowed in unquoted parameters
in:
  key: 'key["a","b",["c","d\",]"],[e,f]]'
out:
  valid_part: 'key["a","b",["c","d\",]"],[e,f]]'
  invalid_part: ''
  return: 'SUCCEED'
---
test case: valid key, single parameter with unquoted string containing double quote characters
in:
  key: 'key[a"b"]'
out:
  valid_part: 'key[a"b"]'
  invalid_part: ''
  return: 'SUCCEED'
---
test case: valid key, multiple different type parameters where one is unquoted string containing double quote characters
in:
  key: 'key["a",b"c",d]'
out:
  valid_part: 'key["a",b"c",d]'
  invalid_part: ''
  return: 'SUCCEED'
---
test case: valid key with many quoted/unquoted parameters with/without trailing/leading spaces also featuring escaping
in:
  key: 'key["\"aaa\"", "bbb","ccc" , "ddd" ,"", "","" , "" ,, ,  ,eee, fff,ggg , hhh" ]'
out:
  valid_part: 'key["\"aaa\"", "bbb","ccc" , "ddd" ,"", "","" , "" ,, ,  ,eee, fff,ggg , hhh" ]'
  invalid_part: ''
  return: 'SUCCEED'
---
test case: valid key in the beginning, invalid character for unquoted parameter, multiple parameter key
in:
  key: 'key["a",["b","c\"]"]]]'
out:
  valid_part: 'key["a",["b","c\"]"]]'
  invalid_part: ']'
  return: 'SUCCEED'
---
test case: valid key in the beginning, unmatched closing bracket, parameter followed by trailing space
in:
  key: 'key[a ]]'
out:
  valid_part: 'key[a ]'
  invalid_part: ']'
  return: 'SUCCEED'
---
test case: valid key in the beginning, unmatched closing bracket, parameter followed by leading space
in:
  key: 'key[ a]]'
out:
  valid_part: 'key[ a]'
  invalid_part: ']'
  return: 'SUCCEED'
---
test case: valid key in the beginning, part of parameters list not enclosed in brackets
in:
  key: 'key[�.У�.�.]654'
out:
  valid_part: 'key[�.У�.�.]'
  invalid_part: '654'
  return: 'SUCCEED'
---
test case: valid key in the beginning, comma is not allowed in key or parameters should be enclosed in brackets
in:
  key: 'ssh,21'
out:
  valid_part: 'ssh'
  invalid_part: ',21'
  return: 'SUCCEED'
---
test case:  valid key in the beginning, multiple square bracket pairs are not allowed
in:
  key: 'key[][]'
out:
  valid_part: 'key[]'
  invalid_part: '[]'
  return: 'SUCCEED'
---
test case: valid key in the beginning, multiple square bracket pairs containing parameters are not allowed
in:
  key: 'key["a",b,["c","d\",]"]]["d"]'
out:
  valid_part: 'key["a",b,["c","d\",]"]]'
  invalid_part: '["d"]'
  return: 'SUCCEED'
---
test case: valid key in the beginning, followed by character ]
in:
  key: 'key[a]]'
out:
  valid_part: 'key[a]'
  invalid_part: ']'
  return: 'SUCCEED'
---
test case: valid key in the beginning, character [ is allowed in unquoted parameter string
in:
  key: 'key[a[b]]'
out:
  valid_part: 'key[a[b]'
  invalid_part: ']'
  return: 'SUCCEED'
---
test case: valid key in the beginning, followed by comma, key with multiple different type parameters
in:
  key: 'key["a",b[c,d],e]'
out:
  valid_part: 'key["a",b[c,d]'
  invalid_part: ',e]'
  return: 'SUCCEED'
---
test case: invalid key, unmatched opening bracket (1)   # array missing closing bracket after second parameter
in:
  key: 'key[["a",]'
out:
  valid_part: 'key[["a",]'
  invalid_part: ''
  return: 'FAIL'
---
test case: invalid key, unmatched opening bracket (2)   # array missing closing bracket after second parameter, one of the closing brackets is inside quotes and is a part of the second array parameter
in:
  key: 'key[["a","\"b\"]"]'
out:
  valid_part: 'key[["a","\"b\"]"]'
  invalid_part: ''
  return: 'FAIL'
---
test case: invalid key, invalid character (double quote) after array-closing bracket
in:
  key: 'key[[a"]"]'
out:
  valid_part: key[[a"]'
  invalid_part: '"]'
  return: 'FAIL'
---
test case: invalid key, braces are not allowed in key
in:
  key: '{}key'
out:
  valid_part: '{}key'	# yes, if the first character of key is invalid, then parse_key() does not advance pointer, so valid and invalid parts are equal.
  invalid_part: '{}key'
  return: 'FAIL'
---
test case: invalid key, multi-level arrays are not allowed
in:
  key: 'key[[[]]]'
out:
  valid_part: 'key[['
  invalid_part: '[]]]'
  return: 'FAIL'
---
test case: invalid key, multi-level arrays are not allowed, array consists of multiple different type parameters
in:
  key: 'key["a",["b",["c","d"],e],"f"]'
out:
  valid_part: 'key["a",["b",'
  invalid_part: '["c","d"],e],"f"]'
  return: 'FAIL'
---
test case: invalid key, multi-level arrays are not allowed, array consists of single parameter which is another array
in:
  key: 'key["a","b",[["c","d\",]"]]]'
out:
  valid_part: 'key["a","b",['
  invalid_part: '["c","d\",]"]]]'
  return: 'FAIL'
---
test case: invalid key, quoted parameter cannot contain unquoted part
in:
  key: 'key["a"b]'
out:
  valid_part: 'key["a"'
  invalid_part: 'b]'
  return: 'FAIL'
---
test case: invalid key, second parameter of the array cannot contain unquoted part
in:
  key: 'key["a",["b","]"c]]'
out:
  valid_part: 'key["a",["b","]"'
  invalid_part: 'c]]'
  return: 'FAIL'
---
test case: invalid key, array type parameter cannot contain quoted parameter with unquoted part
in:
  key: 'key[["]"a]]'
out:
  valid_part: 'key[["]"'
  invalid_part: 'a]]'
  return: 'FAIL'
---
test case: invalid key, array type parameter cannot contain quoted part
in:
  key: 'key[[a]"b"]'
out:
  valid_part: 'key[[a]'
  invalid_part: '"b"]'
  return: 'FAIL'
...