14 parsing single character variables fails

src/dictIO/dictReader.py

@@ -211,7 +211,7 @@ def _eval_expressions(dict: CppDict):
         # Collect all references contained in expressions
         _references: List[str] = []
         for item in dict.expressions.values():
-            _refs: List[str] = re.findall(r"\$\w[\w\[\]]+", item["expression"])
+            _refs: List[str] = re.findall(r"\$\w[\w\[\]]*", item["expression"])
             _references.extend(_refs)
         # Resolve references
         variables: Dict[str, Any] = dict.variables
@@ -233,7 +233,7 @@ def _eval_expressions(dict: CppDict):
             for key, item in expressions_copy.items():
                 placeholder: str = item["name"]
                 expression: str = item["expression"]
-                _refs: List[str] = re.findall(r"\$\w[\w\[\]]+", expression)
+                _refs: List[str] = re.findall(r"\$\w[\w\[\]]*", expression)
                 for ref in _refs:
                     if ref in references_resolved:
                         expression = re.sub(
@@ -265,7 +265,7 @@ def _eval_expressions(dict: CppDict):
             # At the end of each iteration, re-resolve all references based on the now updated variables table of dict
             _references = []
             for item in dict.expressions.values():
-                _refs = re.findall(r"\$\w[\w\[\]]+", item["expression"])
+                _refs = re.findall(r"\$\w[\w\[\]]*", item["expression"])
                 _references.extend(_refs)
             variables = dict.variables
             references = {ref: __class__._resolve_reference(ref, variables) for ref in _references}

src/dictIO/formatter.py

@@ -211,7 +211,7 @@ def format_string(self, arg: str) -> str:
             the formatted string
         """
         if re.search(r"[$]", arg):
-            if re.search(r"^\$\w[\w\[\]]+$", arg):  # reference
+            if re.search(r"^\$\w[\w\[\]]*$", arg):  # reference
                 return self.format_reference_string(arg)
             else:  # expression
                 return self.format_expression_string(arg)

src/dictIO/parser.py

@@ -699,7 +699,7 @@ def _extract_expressions(self, dict: CppDict):
             dict.expressions |= {index: {"expression": expression, "name": placeholder}}
 
         # Step 2: Find references in .block_content (single references to key'd entries that are NOT in double quotes).
-        search_pattern = r"\$\w[\w\[\]]+"
+        search_pattern = r"\$\w[\w\[\]]*"
         while match := re.search(search_pattern, dict.block_content, re.MULTILINE):
             reference = match[0]
             index = self.counter()
@@ -1346,14 +1346,14 @@ def _extract_expression(
         # References are denoted using the '$' syntax familiar from shell programming.
         # Any key'd entries in a dict are considered variables and can be referenced.
         # If string does not contain minimum one reference, return.
-        search_pattern = r"\$\w[\w\[\]]+"
+        search_pattern = r"\$\w[\w\[\]]*"
         references = re.findall(search_pattern, string, re.MULTILINE)
         if not references:
             return string
 
         # Case 1: Reference
         # The string contains only a single plain reference (single reference to a key'd entry in the parsed dict).
-        search_pattern = r"^\s*(\$\w[\w\[\]]+){1}\s*$"
+        search_pattern = r"^\s*(\$\w[\w\[\]]*){1}\s*$"
         if match := re.search(search_pattern, string, re.MULTILINE):
             reference: str = match.groups()[0]
             # Replace the reference in string with a placeholder (EXPRESSION000000) and register it in parsed_dict:

tests/test_dictReader.py

@@ -384,7 +384,7 @@ def test_compare_expressions_in_dict_format_with_expressions_in_json_format():
 def _get_references_in_expressions(dict: CppDict) -> List[str]:
     references: List[str] = []
     for item in dict.expressions.values():
-        _refs: List[str] = re.findall(r"\$\w[\w\[\]]+", item["expression"])
+        _refs: List[str] = re.findall(r"\$\w[\w\[\]]*", item["expression"])
         references.extend(_refs)
     return references
 
@@ -562,6 +562,38 @@ def test_reread_strings_dict():
     assert reread_dict["subDict"]["string_07_sq_escdq_word"] == r"quote(\"string_07_sq_escdq_word\")"
 
 
+def test_single_character_vars():
+    # sourcery skip: avoid-builtin-shadow
+    # Prepare
+    source_file = Path("test_single_character_vars_dict")
+    # Execute
+    dict = DictReader.read(source_file, includes=False)
+    # Assert single character variables are properly parsed
+    assert dict["a"] == 1.0
+    assert dict["b"] is True
+    assert dict["c"]["d"] == 4.0
+    assert dict["c"]["e"] is False
+
+
+def test_single_character_references():
+    # sourcery skip: avoid-builtin-shadow
+    # Prepare
+    source_file = Path("test_single_character_vars_dict")
+    # Execute
+    dict = DictReader.read(source_file)
+    # Assert included dict has been merged and single character references been resolved
+    assert dict["c"]["f"] == 6.0
+    assert dict["c"]["g"] is True
+    assert dict["c"]["h"] == 8.0
+    assert dict["c"]["i"] is False
+    assert dict["j"] == 10.0
+    assert dict["k"] == 12.0
+    assert dict["u"] == 3
+    assert dict["v"] == "Alice"
+    assert dict["w"] == "paragliding contest"
+    assert dict["ww"] == "AliceandBobfailtheparagliding contest"
+
+
 class SetupHelper:
     @staticmethod
     def prepare_dict_until(

tests/test_dicts/test_single_character_vars_dict

@@ -0,0 +1,29 @@
+/*---------------------------------*- C++ -*----------------------------------*\
+filetype dictionary; coding utf-8; version 0.1; local --; purpose --;
+\*----------------------------------------------------------------------------*/
+
+#include 'test_single_character_vars_paramDict'
+
+a    1.0;
+b    true;
+
+n  (0 1 2 3);
+m  (Alice and Bob fail the "paragliding contest");
+
+c
+{
+    d                     4.0;
+    e                     false;
+    f                     $x;
+    g                     $y;
+    h                     $h;
+    i                     $i;
+}
+
+j    $z;
+k    $k;
+
+u    $n[3];
+v    $m[0];
+w    $m[5];
+ww   "$m[0]$m[1]$m[2]$m[3]$m[4]$m[5]";

tests/test_dicts/test_single_character_vars_paramDict

@@ -0,0 +1,12 @@
+/*---------------------------------*- C++ -*----------------------------------*\
+filetype dictionary; coding utf-8; version 0.1; local --; purpose --;
+\*----------------------------------------------------------------------------*/
+
+a             -1.0;
+b            false;
+x              6.0;
+y             true;
+h              8.0;
+i            false;
+z             10.0;
+k             12.0;

tests/test_parser.py

@@ -599,6 +599,92 @@ def test_extract_expressions(self):
         assert list(dict.expressions.values())[8]["name"][:10] == "EXPRESSION"
         assert list(dict.expressions.values())[8]["expression"] == "$varName1[1][2]"
 
+    def test_extract_single_character_expressions(self):
+        # sourcery skip: avoid-builtin-shadow
+        # Prepare
+        dict = CppDict()
+        parser = CppParser()
+        text_block_in = (
+            "This is a text block\n"
+            "with multiple lines. Within this text block, there are key value pairs where the value\n"
+            "is a string surrounded by double quotes and containing at least one reference to a variable starting with $.\n"
+            "Such strings are identified as expressions. Expressions will be evaluated by DictReader.\n"
+            "The following examples will be identified as expressions:\n"
+            "   reference1      $a\n"
+            "   reference2      $a[0]\n"
+            "   reference3      $a[1][2]\n"
+            '   expression1     "$a"\n'
+            '   expression2     "$b + 4"\n'
+            '   expression3     "4 + $b"\n'
+            '   expression4     "$b + $c" and some blabla thereafter\n'
+            '   expression5     "$a + $b + $c" and some blabla thereafter\n'
+            '   expression6     "$b + $c + $a" and some blabla thereafter\n'
+            "The following example will NOT be identified as expression but as string literal:\n"
+            "   string1         '$a is not an expression but a string literal because it is in single instead of double quotes'\n"
+            '   string2         "not an expression but a string literal as it does not contain a Dollar character"\n'
+            "_extract_expressions() will extract expressions and substitute them with a placeholder\n"
+            "in the form E X P R E S S I O N 0 0 0 0 0 0."
+            "The actual evaluation of an expression is not part of _extract_expressions(). The evaluation is done within ()."
+        )
+        text_block_expected = (
+            "This is a text block\n"
+            "with multiple lines. Within this text block, there are key value pairs where the value\n"
+            "is a string surrounded by double quotes and containing at least one reference to a variable starting with $.\n"
+            "Such strings are identified as expressions. Expressions will be evaluated by DictReader.\n"
+            "The following examples will be identified as expressions:\n"
+            "   reference1      EXPRESSION000000\n"
+            "   reference2      EXPRESSION000000\n"
+            "   reference3      EXPRESSION000000\n"
+            "   expression1     EXPRESSION000000\n"
+            "   expression2     EXPRESSION000000\n"
+            "   expression3     EXPRESSION000000\n"
+            "   expression4     EXPRESSION000000 and some blabla thereafter\n"
+            "   expression5     EXPRESSION000000 and some blabla thereafter\n"
+            "   expression6     EXPRESSION000000 and some blabla thereafter\n"
+            "The following example will NOT be identified as expression but as string literal:\n"
+            "   string1         STRINGLITERAL000000\n"
+            "   string2         STRINGLITERAL000000\n"
+            "_extract_expressions() will extract expressions and substitute them with a placeholder\n"
+            "in the form E X P R E S S I O N 0 0 0 0 0 0."
+            "The actual evaluation of an expression is not part of _extract_expressions(). The evaluation is done within ()."
+        )
+        dict.block_content = text_block_in
+        parser._extract_string_literals(dict)
+        # Execute
+        parser._extract_expressions(dict)
+        # Assert
+        text_block_out = re.sub(r"[0-9]{6}", "000000", dict.block_content)
+        assert text_block_out == text_block_expected
+        string_diff(text_block_out, text_block_expected)
+        assert len(dict.expressions) == 9
+
+        assert list(dict.expressions.values())[0]["name"][:10] == "EXPRESSION"
+        assert list(dict.expressions.values())[0]["expression"] == "$a"
+
+        assert list(dict.expressions.values())[1]["name"][:10] == "EXPRESSION"
+        assert list(dict.expressions.values())[1]["expression"] == "$b + 4"
+
+        assert list(dict.expressions.values())[2]["name"][:10] == "EXPRESSION"
+        assert list(dict.expressions.values())[2]["expression"] == "4 + $b"
+
+        assert list(dict.expressions.values())[3]["name"][:10] == "EXPRESSION"
+        assert list(dict.expressions.values())[3]["expression"] == "$b + $c"
+
+        assert list(dict.expressions.values())[4]["name"][:10] == "EXPRESSION"
+        assert list(dict.expressions.values())[4]["expression"] == "$a + $b + $c"
+
+        assert list(dict.expressions.values())[5]["name"][:10] == "EXPRESSION"
+        assert list(dict.expressions.values())[5]["expression"] == "$b + $c + $a"
+
+        assert list(dict.expressions.values())[6]["name"][:10] == "EXPRESSION"
+        assert list(dict.expressions.values())[6]["expression"] == "$a"
+
+        assert list(dict.expressions.values())[7]["name"][:10] == "EXPRESSION"
+        assert list(dict.expressions.values())[7]["expression"] == "$a[0]"
+
+        assert list(dict.expressions.values())[8]["name"][:10] == "EXPRESSION"
+        assert list(dict.expressions.values())[8]["expression"] == "$a[1][2]"
+
     def test_separate_delimiters(self):
         # sourcery skip: avoid-builtin-shadow
         # sourcery skip: no-loop-in-tests