Make f-strings backward compatible for Python < 3.12

README.md

@@ -84,5 +84,8 @@ For the full documentation, see the Python docstrings.
 
 ## Changelog
 
+### Version 0.1.1
+- backward compatibility for Python < 3.12: in Python < 3.12, f-string expression parts could not contain backslashes. The code contained an f-string with backslahes in the expression part. As an alternative to the f-string, normal strings are concatenated now.
+
 ### Version 0.1.0
 - Changed the name from `config-parser` to `jcloud-config-parser`

pyproject.toml

@@ -4,6 +4,6 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "jcloud-config-parser"
-version = "0.1.0"
+version = "0.1.1"
 description = "A configuration file parser."
 license = "Apache-2.0"

src/jcloud_config_parser/parse/json.py

@@ -328,7 +328,7 @@ class JSONObject(JSONType):
                     current_key = ''
                     current_value = None
                 else:
-                    raise JSONObjectSyntaxError(f'expected \':\'')
+                    raise JSONObjectSyntaxError('expected \':\'')
 
         if current_key:
             if current_value is not None:
@@ -336,7 +336,7 @@ class JSONObject(JSONType):
                 current_key = ''
                 current_value = None
             else:
-                raise JSONObjectSyntaxError(f'expected value')
+                raise JSONObjectSyntaxError('expected value')
 
         json_object = {}
         for k, v in _object.items():
@@ -471,27 +471,27 @@ def parse_type(value: str) -> typing.Type[JSONType]:
                 if current_value is None:
                     current_value = ''
                 else:
-                    raise JSONObjectSyntaxError(f'expected \',\'')
+                    raise JSONObjectSyntaxError('expected \',\'')
 
             if not string and c == ',' and not arrays and not objects:
                 if current_value is not None:
                     if parse_type(current_key) != JSONString:
-                        raise JSONObjectSyntaxError(f'keys have to be strings')
+                        raise JSONObjectSyntaxError('keys have to be strings')
                     parse_type(current_value[:-1])
                     current_key = ''
                     current_value = None
                 else:
-                    raise JSONObjectSyntaxError(f'expected \':\'')
+                    raise JSONObjectSyntaxError('expected \':\'')
 
         if current_key:
             if current_value is not None:
                 if parse_type(current_key) != JSONString:
-                    raise JSONObjectSyntaxError(f'keys have to be strings')
+                    raise JSONObjectSyntaxError('keys have to be strings')
                 parse_type(current_value)
                 current_key = ''
                 current_value = None
             else:
-                raise JSONObjectSyntaxError(f'expected value')
+                raise JSONObjectSyntaxError('expected value')
 
         if string:
             raise JSONStringSyntaxError('unterminated string literal')
@@ -568,11 +568,12 @@ def parse_type(value: str) -> typing.Type[JSONType]:
         if value[0] != '"':
             raise JSONStringSyntaxError(f'expected \'"\' as first char, got \'{value[0]}\'')
         if '\n' in value:
-            raise JSONStringSyntaxError(f'line feeds are not allowed inside of strings. Use escape sequences.')
+            raise JSONStringSyntaxError('line feeds are not allowed inside of strings. Use escape sequences.')
         if value.count('"') < 2:
             raise JSONStringSyntaxError('unterminated string literal')
         if value.count('"') - value.count('\\"') > 2 or value[-1] != '"':
-            raise JSONStringSyntaxError(f'unexpected token: \'{"\"".join(value.split("\"")[2:])}\'')
+            # backward compatibility (in Python < 3.12, f-string expression parts could not contain backslashes)
+            raise JSONStringSyntaxError('unexpected token: \'' + '\"'.join(value.split('\"')[2:]) + '\'')
         parse_escape_sequences(value)
         return JSONString