Aunsiels__pyformlang-32

The user is reporting a bug in `pyformlang.cfg.CFG.from_text` where the `TER:X` notation is not respected for uppercase terminals in Context-Free Grammars (CFGs).

According to the problem statement:
`CFG.from_text('S -> "TER:A"')` should be equivalent to `CFG(variables={"S"}, terminals={"A"}, start_symbol="S", productions={Production(Variable("S"), (Terminal("A"),))})`.

Let's start by reproducing this bug.

{
  "command": "python3 - <<'PY'\nfrom pyformlang.cfg import CFG, Production, Terminal, Variable\n\ncfg1 = CFG.from_text('S -> \"TER:A\"')\nprint(f\"CFG1 productions: {cfg1.productions}\")\nprint(f\"CFG1 terminals: {cfg1.terminals}\")\n\ncfg2 = CFG(\n    variables={\"S\"},\n    terminals={\"A\"},\n    start_symbol=\"S\",\n    productions={Production(Variable(\"S\"), (Terminal(\"A\"),))},\n)\nprint(f\"CFG2 productions: {cfg2.productions}\")\nprint(f\"CFG2 terminals: {cfg2.terminals}\")\n\nprint(f\"Equal: {cfg1 == cfg2}\")\nPY\n"
}

{
  "status": "ok",
  "stdout": "CFG1 productions: {S -> A}\nCFG1 terminals: set()\nCFG2 productions: {S -> Terminal(A)}\nCFG2 terminals: {Terminal(A)}\nEqual: False\n",
  "stderr": "",
  "exit_code": 0
}

Wait, the output of `CFG1 productions: {S -> A}` looks strange. `S` is likely a `Variable` and `A` is likely a... let's check what it is.
In `CFG2`, it says `S -> Terminal(A)`.

In `CFG1`, `S -> A` is printed. If `A` is a `Variable`, then CFG1 is actually `S -> A` (Variable to Variable).
`CFG1 terminals: set()` confirms that `A` was not treated as a terminal.

So `CFG.from_text('S -> "TER:A"')` resulted in `A` being treated as a variable instead of a terminal.

Now I need to find where `CFG.from_text` is implemented. It's likely in `pyformlang/cfg/cfg.py` or `pyformlang/cfg/utils_cfg.py` or `pyformlang/cfg/cfg_object.py`.
Let's grep for `from_text`.

{
  "command": "grep -rn --include=\"*.py\" \"def from_text\" pyformlang/cfg/"
}

{
  "status": "ok",
  "stdout": "pyformlang/cfg/cfg.py:1028:    def from_text(cls, text, start_symbol=Variable(\"S\")):\n",
  "stderr": "",
  "exit_code": 0
}

Okay, it's in `pyformlang/cfg/cfg.py` at line 1028.
Let's examine the `from_text` method in `pyformlang/cfg/cfg.py`.

{
  "filepath": "pyformlang/cfg/cfg.py",
  "start_line": 1028
}

{
  "status": "ok",
  "filepath": "pyformlang/cfg/cfg.py",
  "content": "    def from_text(cls, text, start_symbol=Variable(\"S\")):\n        \"\"\"\n        Read a context free grammar from a text.\n        The text contains one rule per line.\n        The structure of a production is:\n        head -> body1 | body2 | ... | bodyn\n        where | separates the bodies.\n        A variable (or non terminal) begins by a capital letter.\n        A terminal begins by a non-capital character\n        Terminals and Variables are separated by spaces.\n        An epsilon symbol can be represented by epsilon, $, ε, ϵ or Є.\n        If you want to have a variable name starting with a non-capital \\\n        letter or a terminal starting with a capital letter, you can \\\n        explicitly give the type of your symbol with \"VAR:yourVariableName\" \\\n        or \"TER:yourTerminalName\" (with the quotation marks). For example:\n        S -> \"TER:John\" \"VAR:d\" a b\n\n        Parameters\n        ----------\n        text : str\n            The text of transform\n        start_symbol : str, optional\n            The start symbol, S by default\n\n        Returns\n        -------\n        cfg : :class:`~pyformlang.cfg.CFG`\n            A context free grammar.\n        \"\"\"\n        variables = set()\n        productions = set()\n        terminals = set()\n        for line in text.splitlines():\n            line = line.strip()\n            if not line:\n                continue\n            cls._read_line(line, productions, terminals, variables)\n        return cls(variables=variables, terminals=terminals,\n                   productions=productions, start_symbol=start_symbol)\n\n    @classmethod\n    def _read_line(cls, line, productions, terminals, variables):\n        head_s, body_s = line.split(\"->\")\n        head_text = head_s.strip()\n        if is_special_text(head_text):\n            head_text = head_text[5:-1]\n        head = Variable(head_text)\n        variables.add(head)\n        for sub_body in body_s.split(\"|\"):\n            body = []\n            for body_component in sub_body.split():\n                if is_special_text(body_component):\n                    type_component = body_component[1:4]\n                    body_component = body_component[5:-1]\n                else:\n                    type_component = \"\"\n                if body_component[0] in string.ascii_uppercase or \\\n                        type_component == \"VAR\":\n                    body_var = Variable(body_component)\n                    variables.add(body_var)\n                    body.append(body_var)\n                elif body_component not in EPSILON_SYMBOLS or type_component \\\n                        == \"TER\":\n                    body_ter = Terminal(body_component)\n                    terminals.add(body_ter)\n                    body.append(body_ter)\n            productions.add(Production(head, body))\n\n    def is_normal_form(self):\n        \"\"\"\n        Tells is the current grammar is in Chomsky Normal Form or not\n\n        Returns\n        -------\n        is_normal_form : bool\n            If the current grammar is in CNF\n        \"\"\"\n        return all(\n            production.is_normal_form() for production in self._productions)",
  "start_line": 1028,
  "end_line": 1106,
  "total_lines": 1106,
  "is_truncated": false
}

Let's look at `_read_line` carefully.

```python
    @classmethod
    def _read_line(cls, line, productions, terminals, variables):
        head_s, body_s = line.split("->")
        head_text = head_s.strip()
        if is_special_text(head_text):
            head_text = head_text[5:-1]
        head = Variable(head_text)
        variables.add(head)
        for sub_body in body_s.split("|"):
            body = []
            for body_component in sub_body.split():
                if is_special_text(body_component):
                    type_component = body_component[1:4]
                    body_component = body_component[5:-1]
                else:
                    type_component = ""
                if body_component[0] in string.ascii_uppercase or \
                        type_component == "VAR":
                    body_var = Variable(body_component)
                    variables.add(body_var)
                    body.append(body_var)
                elif body_component not in EPSILON_SYMBOLS or type_component \
                        == "TER":
                    body_ter = Terminal(body_component)
                    terminals.add(body_ter)
                    body.append(body_ter)
            productions.add(Production(head, body))
```

If `body_component` is `"TER:A"`, then:
1. `is_special_text(body_component)` is probably True.
2. `type_component = body_component[1:4]` which is `"TER"`.
3. `body_component = body_component[5:-1]` which is `"A"`.

Then it checks:
```python
                if body_component[0] in string.ascii_uppercase or \
                        type_component == "VAR":
                    body_var = Variable(body_component)
                    variables.add(body_var)
                    body.append(body_var)
```
`body_component[0]` is `'A'`, which is in `string.ascii_uppercase`. So it becomes a `Variable`, even though `type_component` is `"TER"`.

The logic is:
If (starts with uppercase OR type is VAR), then it is a Variable.
Else if (not an epsilon symbol OR type is TER), then it is a Terminal.

Wait, look at the logic:
```python
                if body_component[0] in string.ascii_uppercase or \
                        type_component == "VAR":
                    body_var = Variable(body_component)
```
If `type_component == "TER"`, it still enters this block if `body_component[0]` is uppercase. This is the bug.

If `type_component == "TER"`, it SHOULD be a Terminal, regardless of `body_component[0]`.
If `type_component == "VAR"`, it SHOULD be a Variable, regardless of `body_component[0]`.
If `type_component == ""`, then we use the uppercase rule.

So the logic should be:
1. If `type_component == "VAR"`, it's a Variable.
2. If `type_component == "TER"`, it's a Terminal.
3. If `type_component == ""`:
    a. If `body_component[0]` is uppercase, it's a Variable.
    b. If it's an epsilon symbol, it's an epsilon symbol (which should probably be handled separately or as a terminal, but the current code treats non-epsilon non-uppercase as terminals).
    c. Otherwise, it's a Terminal.

Wait, let's see how epsilon symbols are handled.
```python
                elif body_component not in EPSILON_SYMBOLS or type_component \
                        == "TER":
                    body_ter = Terminal(body_component)
```
Actually, if `body_component` is in `EPSILON_SYMBOLS` and `type_component == ""`, it's neither a Variable nor a Terminal (it's just skipped/ignored in the body?). No, that can't be right.

Let's look at `EPSILON_SYMBOLS`. I need to see where it's defined. It's probably in `pyformlang/cfg/cfg.py` or imported.
I'll search for `EPSILON_SYMBOLS` in `pyformlang/cfg/cfg.py`.

{
  "command": "grep -n \"EPSILON_SYMBOLS\" pyformlang/cfg/cfg.py"
}

{
  "status": "ok",
  "stdout": "25:EPSILON_SYMBOLS = [\"epsilon\", \"$\", \"ε\", \"ϵ\", \"Є\"]\n1089:                elif body_component not in EPSILON_SYMBOLS or type_component \\\n",
  "stderr": "",
  "exit_code": 0
}

Okay, `EPSILON_SYMBOLS` is defined at line 25.

Let's re-examine the current logic:
```python
                if body_component[0] in string.ascii_uppercase or \
                        type_component == "VAR":
                    body_var = Variable(body_component)
                    variables.add(body_var)
                    body.append(body_var)
                elif body_component not in EPSILON_SYMBOLS or type_component \
                        == "TER":
                    body_ter = Terminal(body_component)
                    terminals.add(body_ter)
                    body.append(body_ter)
```

If `body_component` is `"A"` and `type_component` is `"TER"`:
`body_component[0] in string.ascii_uppercase` is True.
It becomes a `Variable`. BUG.

If `body_component` is `"a"` and `type_component` is `"VAR"`:
`body_component[0] in string.ascii_uppercase` is False.
`type_component == "VAR"` is True.
It becomes a `Variable`. CORRECT.

If `body_component` is `"a"` and `type_component` is `""`:
`body_component[0] in string.ascii_uppercase` is False.
`type_component == "VAR"` is False.
It goes to `elif`.
`body_component not in EPSILON_SYMBOLS` is True.
It becomes a `Terminal`. CORRECT.

If `body_component` is `"epsilon"` and `type_component` is `""`:
`body_component[0] in string.ascii_uppercase` is False.
`type_component == "VAR"` is False.
It goes to `elif`.
`body_component not in EPSILON_SYMBOLS` is False.
`type_component == "TER"` is False.
It's not added to `body`. CORRECT (epsilon is usually handled by an empty list or a special symbol).

If `body_component` is `"epsilon"` and `type_component` is `"TER"`:
`body_component[0] in string.ascii_uppercase` (probably False, 'e' is not uppercase).
`type_component == "VAR"` is False.
It goes to `elif`.
`body_component not in EPSILON_SYMBOLS` is False.
`type_component == "TER"` is True.
It becomes a `Terminal("epsilon")`. CORRECT.

So the problem is exactly the first `if` condition. It should prioritize `type_component` over the uppercase rule.

Current:
```python
                if body_component[0] in string.ascii_uppercase or \
                        type_component == "VAR":
```

Desired:
If `type_component` is provided, use it. Otherwise use the uppercase rule.

```python
                if type_component == "VAR" or (type_component == "" and body_component[0] in string.ascii_uppercase):
```

And for the `elif`:
```python
                elif type_component == "TER" or (type_component == "" and body_component not in EPSILON_SYMBOLS):
```

Wait, let's check if we can simplify this.

```python
                if type_component == "VAR":
                    # Variable
                elif type_component == "TER":
                    # Terminal
                elif body_component[0] in string.ascii_uppercase:
                    # Variable
                elif body_component not in EPSILON_SYMBOLS:
                    # Terminal
```

This looks much cleaner.

Let's also check `is_special_text`. I need to see its definition.

{
  "command": "grep -rn \"def is_special_text\" pyformlang/cfg/"
}

{
  "status": "ok",
  "stdout": "pyformlang/cfg/cfg.py:34:def is_special_text(text):\n",
  "stderr": "",
  "exit_code": 0
}

Let's read `is_special_text` in `pyformlang/cfg/cfg.py`.

{
  "filepath": "pyformlang/cfg/cfg.py",
  "start_line": 34
}

{
  "status": "ok",
  "filepath": "pyformlang/cfg/cfg.py",
  "content": "def is_special_text(text):\n    \"\"\" Check if the input is given an explicit type \"\"\"\n    return len(text) > 5 and \\\n        (text[0:5] == '\"VAR:' or text[0:5] == '\"TER:') and \\\n        text[-1] == '\"'\n\n\nclass CFG:\n    \"\"\" A class representing a context free grammar\n\n    Parameters\n    ----------\n    variables : set of :class:`~pyformlang.cfg.Variable`, optional\n        The variables of the CFG\n    terminals : set of :class:`~pyformlang.cfg.Terminal`, optional\n        The terminals of the CFG\n    start_symbol : :class:`~pyformlang.cfg.Variable`, optional\n        The start symbol\n    productions : set of :class:`~pyformlang.cfg.Production`, optional\n        The productions or rules of the CFG\n    \"\"\"\n\n    # pylint: disable=too-many-instance-attributes\n\n    def __init__(self,\n                 variables: AbstractSet[Union[Variable, str]] = None,\n                 terminals: AbstractSet[Union[Terminal, str]] = None,\n                 start_symbol: Union[Variable, str] = None,\n                 productions: Iterable[Production] = None):\n        if variables is not None:\n            variables = {to_variable(x) for x in variables}\n        self._variables = variables or set()\n        self._variables = set(self._variables)\n        if terminals is not None:\n            terminals = {to_terminal(x) for x in terminals}\n        self._terminals = terminals or set()\n        self._terminals = set(self._terminals)\n        if start_symbol is not None:\n            start_symbol = to_variable(start_symbol)\n        self._start_symbol = start_symbol\n        if start_symbol is not None:\n            self._variables.add(start_symbol)\n        self._productions = productions or set()\n        self._productions = self._productions\n        for production in self._productions:\n            self.__initialize_production_in_cfg(production)\n        self._normal_form = None\n        self._generating_symbols = None\n        self._nullable_symbols = None\n        self._impacts = None\n        self._remaining_lists = None\n        self._added_impacts = None\n\n    def __initialize_production_in_cfg(self, production):\n        self._variables.add(production.head)\n        for cfg_object in production.body:\n            if isinstance(cfg_object, Terminal):\n                self._terminals.add(cfg_object)\n            else:\n                self._variables.add(cfg_object)\n\n    def get_generating_symbols(self) -> AbstractSet[CFGObject]:\n        \"\"\" Gives the objects which are generating in the CFG\n\n        Returns\n        ----------\n        generating_symbols : set of :class:`~pyformlang.cfg.CFGObject`\n            The generating symbols of the CFG\n        \"\"\"\n        if self._generating_symbols is None:\n            self._generating_symbols = self._get_generating_or_nullable(False)\n        return self._generating_symbols\n\n    def _get_generating_or_nullable(self, nullable=False):\n        \"\"\" Merge of nullable and generating \"\"\"\n        to_process = [Epsilon()]\n        g_symbols = {Epsilon()}\n\n        self._set_impacts_and_remaining_lists()\n\n        for symbol in self._added_impacts:\n            if symbol not in g_symbols:\n                g_symbols.add(symbol)\n                to_process.append(symbol)\n\n        if not nullable:\n            for terminal in self._terminals:\n                g_symbols.add(terminal)\n                to_process.append(terminal)\n\n        processed_with_modification = []\n        while to_process:\n            current = to_process.pop()\n            for symbol_impact, index_impact in self._impacts.get(current, []):\n                if symbol_impact in g_symbols:\n                    continue\n                processed_with_modification.append(\n                    (symbol_impact, index_impact))\n                self._remaining_lists[symbol_impact][index_impact] -= 1\n                if self._remaining_lists[symbol_impact][index_impact] == 0:\n                    g_symbols.add(symbol_impact)\n                    to_process.append(symbol_impact)\n        # Fix modifications\n        for symbol_impact, index_impact in processed_with_modification:\n            self._remaining_lists[symbol_impact][index_impact] += 1\n        g_symbols.remove(Epsilon())\n        return g_symbols\n\n    def _set_impacts_and_remaining_lists(self):\n        if self._impacts is not None:\n            return\n        self._added_impacts = set()\n        self._remaining_lists = {}\n        self._impacts = {}\n        for production in self._productions:\n            head = production.head  # Should check if head is not Epsilon?\n            body = production.body\n            if not body:\n                self._added_impacts.add(head)\n                continue\n            temp = self._remaining_lists.setdefault(head, [])\n            temp.append(len(body))\n            index_impact = len(temp) - 1\n            for symbol in body:\n                self._impacts.setdefault(symbol, []).append(\n                    (head, index_impact))\n\n    def generate_epsilon(self):\n        \"\"\" Whether the grammar generates epsilon or not\n\n        Returns\n        ----------\n        generate_epsilon : bool\n            Whether epsilon is generated or not by the CFG\n        \"\"\"\n        generate_epsilon = {Epsilon()}\n        to_process = [Epsilon()]\n\n        self._set_impacts_and_remaining_lists()\n\n        for symbol in self._added_impacts:\n            if symbol == self._start_symbol:\n                return True\n            if symbol not in generate_epsilon:\n                generate_epsilon.add(symbol)\n                to_process.append(symbol)\n        remaining_lists = self._remaining_lists\n        impacts = self._impacts\n        remaining_lists = deepcopy(remaining_lists)\n",
  "start_line": 34,
  "end_line": 183,
  "total_lines": 1106,
  "is_truncated": true
}

`is_special_text` checks if the text starts with `"VAR:` or `"TER:` and ends with `"`.
The `from_text` logic then extracts `type_component` (indices 1 to 4) and `body_component` (indices 5 to -1).

Wait, `is_special_text` uses `text[0:5]`.
Example: `"TER:A"`
Indices:
0: `"`
1: `T`
2: `E`
3: `R`
4: `:`
5: `A`
6: `"`

`text[0:5]` is `"TER:`. Correct.
`text[1:4]` is `TER`. Correct.
`text[5:-1]` is `A`. Correct.

So the logic in `_read_line` for parsing these special strings is correct. The problem is indeed in the conditional check that decides whether it's a `Variable` or a `Terminal`.

Let's fix the conditional logic in `pyformlang/cfg/cfg.py`.

Current code:
```python
                if body_component[0] in string.ascii_uppercase or \
                        type_component == "VAR":
                    body_var = Variable(body_component)
                    variables.add(body_var)
                    body.append(body_var)
                elif body_component not in EPSILON_SYMBOLS or type_component \
                        == "TER":
                    body_ter = Terminal(body_component)
                    terminals.add(body_ter)
                    body.append(body_ter)
```

Proposed fix:
```python
                if type_component == "VAR" or (type_component == "" and \
                        body_component[0] in string.ascii_uppercase):
                    body_var = Variable(body_component)
                    variables.add(body_var)
                    body.append(body_var)
                elif type_component == "TER" or (type_component == "" and \
                        body_component not in EPSILON_SYMBOLS):
                    body_ter = Terminal(body_component)
                    terminals.add(body_ter)
                    body.append(body_ter)
```

Wait, let me check if I missed any other cases.
If `type_component == "VAR"`, it's always a Variable.
If `type_component == "TER"`, it's always a Terminal.
If `type_component == ""`:
    If `body_component[0]` is uppercase, it's a Variable.
    Else if `body_component` is not in `EPSILON_SYMBOLS`, it's a Terminal.
    Else (it is an epsilon symbol), it's neither.

This covers all cases and prioritizes the explicit type.

Wait, what if `body_component` is empty? `body_component[0]` would raise an `IndexError`.
However, `sub_body.split()` will only return non-empty strings. So `body_component` will always have at least one character.

Let's verify this with the reproduction script.
Actually, I should also test the case where a terminal starts with a lowercase letter but is explicitly marked as `VAR:`.
And where a variable starts with a lowercase letter but is explicitly marked as `VAR:`.
And where a terminal starts with an uppercase letter but is explicitly marked as `TER:`.

Let's create a more comprehensive reproduction script.

{
  "command": "python3 - <<'PY'\nfrom pyformlang.cfg import CFG, Production, Terminal, Variable\n\ndef test_from_text(text, expected_vars, expected_terms, expected_prods):\n    cfg = CFG.from_text(text)\n    print(f\"Text: {text}\")\n    print(f\"Expected Vars: {expected_vars}, Actual: {cfg.variables}\")\n    print(f\"Expected Terms: {expected_terms}, Actual: {cfg.terminals}\")\n    print(f\"Expected Prods: {expected_prods}, Actual: {cfg.productions}\")\n    assert cfg.variables == expected_vars\n    assert cfg.terminals == expected_terms\n    assert cfg.productions == expected_prods\n    print(\"SUCCESS\")\n    print(\"-\" * 20)\n\n# Case 1: Terminal starting with Uppercase (The reported bug)\n# expected: terminals={\"A\"}, variables={\"S\"}, productions={S -> A}\ntest_from_text('S -> \"TER:A\"', {\"S\"}, {\"A\"}, {Production(Variable(\"S\"), (Terminal(\"A\"),))})\n\n# Case 2: Variable starting with lowercase\n# expected: terminals=set(), variables={\"S\", \"a\"}, productions={S -> a}\ntest_from_text('S -> \"VAR:a\"', {\"S\", \"a\"}, set(), {Production(Variable(\"S\"), (Variable(\"a\"),))})\n\n# Case 3: Ordinary variable and terminal\n# expected: terminals={\"a\"}, variables={\"S\", \"A\"}, productions={S -> A a}\ntest_from_text('S -> A a', {\"S\", \"A\"}, {\"a\"}, {Production(Variable(\"S\"), (Variable(\"A\"), Terminal(\"a\")))})\n\n# Case 4: Epsilon symbol\n# expected: terminals=set(), variables={\"S\"}, productions={S -> epsilon} (body is empty)\ntest_from_text('S -> epsilon', {\"S\"}, set(), {Production(Variable(\"S\"), ())})\n\nprint(\"ALL TESTS PASSED\")\nPY\n"
}

{
  "status": "error",
  "error_type": "CommandError",
  "error_message": "Traceback (most recent call last):\n  File \"<stdin>\", line 17, in <module>\n  File \"<stdin>\", line 9, in test_from_text\nAssertionError\n",
  "details": {
    "stdout": "Text: S -> \"TER:A\"\nExpected Vars: {'S'}, Actual: {Variable(A), Variable(S)}\nExpected Terms: {'A'}, Actual: set()\nExpected Prods: {S -> Terminal(A)}, Actual: {S -> A}\n",
    "stderr": "Traceback (most recent call last):\n  File \"<stdin>\", line 17, in <module>\n  File \"<stdin>\", line 9, in test_from_text\nAssertionError\n",
    "exit_code": 1
  }
}

The reproduction script failed as expected. `A` was treated as a `Variable` instead of a `Terminal`.

Now I will apply the fix.

Looking at the code again:
```python
                if body_component[0] in string.ascii_uppercase or \
                        type_component == "VAR":
                    body_var = Variable(body_component)
                    variables.add(body_var)
                    body.append(body_var)
                elif body_component not in EPSILON_SYMBOLS or type_component \
                        == "TER":
                    body_ter = Terminal(body_component)
                    terminals.add(body_ter)
                    body.append(body_ter)
```

I will change it to:
```python
                if type_component == "VAR" or (type_component == "" and \
                        body_component[0] in string.ascii_uppercase):
                    body_var = Variable(body_component)
                    variables.add(body_var)
                    body.append(body_var)
                elif type_component == "TER" or (type_component == "" and \
                        body_component not in EPSILON_SYMBOLS):
                    body_ter = Terminal(body_component)
                    terminals.add(body_ter)
                    body.append(body_ter)
```

Wait, let's be careful with the indentation and the way `edit_file` works.

<|tool_call>call edit_file{filepath:<|"|>pyformlang/cfg/cfg.py<|"|>,new_string:<|"|>                if type_component == "VAR" or (type_component == "" and \
                        body_component[0] in string.ascii_uppercase):
                    body_var = Variable(body_component)
                    variables.add(body_var)
                    body.append(body_var)
                elif type_component == "TER" or (type_component == "" and \
                        body_component not in EPSILON_SYMBOLS):
                    body_ter = Terminal(body_component)
                    terminals.add(body_ter)
                    body.append(body_ter)<|"|>,old_string:<|"|>                if body_component[0] in string.ascii_uppercase or \
                        type_component == "VAR":
                    body_var = Variable(body_component)
                    variables.add(body_var)
                    body.append(body_var)
                elif body_component not in EPSILON_SYMBOLS or type_component \
                        == "TER":
                    body_ter = Terminal(body_component)
                    terminals.add(body_ter)
                    body.append(body_ter)<|"|>}<tool_call|>

Wait, the `edit_file` call from the previous turn might not have been executed because it was cut off. Or it was, but the output was truncated.
Let me check `git diff` to see if the change was applied.

{
  "command": "git diff pyformlang/cfg/cfg.py"
}

{
  "status": "ok",
  "stdout": "",
  "stderr": "",
  "exit_code": 0
}

The `edit_file` was indeed cut off and not applied. Let me apply it again, carefully.

The original code was:
```python
                if body_component[0] in string.ascii_uppercase or \
                        type_component == "VAR":
                    body_var = Variable(body_component)
                    variables.add(body_var)
                    body.append(body_var)
                elif body_component not in EPSILON_SYMBOLS or type_component \
                        == "TER":
                    body_ter = Terminal(body_component)
                    terminals.add(body_ter)
                    body.append(body_ter)
```

The problem is that `body_component[0] in string.ascii_uppercase` is checked FIRST, so if `type_component == "TER"`, it still goes into the `if` block if the first letter is uppercase.

I want:
If `type_component == "VAR"`, it's a Variable.
Else if `type_component == "TER"`, it's a Terminal.
Else if `type_component == ""`:
    If `body_component[0] in string.ascii_uppercase`, it's a Variable.
    Else if `body_component not in EPSILON_SYMBOLS`, it's a Terminal.
    Else it's epsilon (already handled by the logic if we use `if/elif`).

Wait, the original code has `elif body_component not in EPSILON_SYMBOLS or type_component == "TER":`.
If `body_component` is `epsilon`, and `type_component` is `""`, it skips the `elif` too.

Let's rewrite the logic:
```python
                if type_component == "VAR" or (type_component == "" and body_component[0] in string.ascii_uppercase):
                    body_var = Variable(body_component)
                    variables.add(body_var)
                    body.append(body_var)
                elif type_component == "TER" or (type_component == "" and body_component not in EPSILON_SYMBOLS):
                    body_ter = Terminal(body_component)
                    terminals.add(body_ter)
                    body.append(body_ter)
```

Let's re-examine the `_read_line` method in `pyformlang/cfg/cfg.py`.

{
  "end_line": 1106,
  "filepath": "pyformlang/cfg/cfg.py",
  "start_line": 1075
}

{
  "status": "ok",
  "filepath": "pyformlang/cfg/cfg.py",
  "content": "        variables.add(head)\n        for sub_body in body_s.split(\"|\"):\n            body = []\n            for body_component in sub_body.split():\n                if is_special_text(body_component):\n                    type_component = body_component[1:4]\n                    body_component = body_component[5:-1]\n                else:\n                    type_component = \"\"\n                if body_component[0] in string.ascii_uppercase or \\\n                        type_component == \"VAR\":\n                    body_var = Variable(body_component)\n                    variables.add(body_var)\n                    body.append(body_var)\n                elif body_component not in EPSILON_SYMBOLS or type_component \\\n                        == \"TER\":\n                    body_ter = Terminal(body_component)\n                    terminals.add(body_ter)\n                    body.append(body_ter)\n            productions.add(Production(head, body))\n\n    def is_normal_form(self):\n        \"\"\"\n        Tells is the current grammar is in Chomsky Normal Form or not\n\n        Returns\n        -------\n        is_normal_form : bool\n            If the current grammar is in CNF\n        \"\"\"\n        return all(\n            production.is_normal_form() for production in self._productions)",
  "start_line": 1075,
  "end_line": 1106,
  "total_lines": 1106,
  "is_truncated": false
}

The `edit_file` should work now.

{
  "filepath": "pyformlang/cfg/cfg.py",
  "new_string": "                if type_component == \"VAR\" or (type_component == \"\" and \\\\\\n                        body_component[0] in string.ascii_uppercase):\\n                    body_var = Variable(body_component)\\n                    variables.add(body_var)\\n                    body.append(body_var)\\n                elif type_component == \"TER\" or (type_component == \"\" and \\\\\\n                        body_component not in EPSILON_SYMBOLS):\\n                    body_ter = Terminal(body_component)\\n                    terminals.add(body_ter)\\n                    body.append(body_ter)",
  "old_string": "                if body_component[0] in string.ascii_uppercase or \\\\\\n                        type_component == \"VAR\":\\n                    body_var = Variable(body_component)\\n                    variables.add(body_var)\\n                    body.append(body_var)\\n                elif body_component not in EPSILON_SYMBOLS or type_component \\\\\\n                        == \"TER\":\\n                    body_ter = Terminal(body_component)\\n                    terminals.add(body_ter)\\n                    body.append(body_ter)"
}

{
  "status": "ok",
  "filepath": "pyformlang/cfg/cfg.py",
  "occurrences": 1,
  "strategy": "unescaped",
  "diff": "--- a/pyformlang/cfg/cfg.py\n+++ b/pyformlang/cfg/cfg.py\n@@ -1081,13 +1081,13 @@\n                     body_component = body_component[5:-1]\n                 else:\n                     type_component = \"\"\n-                if body_component[0] in string.ascii_uppercase or \\\n-                        type_component == \"VAR\":\n+                if type_component == \"VAR\" or (type_component == \"\" and \\\n+                        body_component[0] in string.ascii_uppercase):\n                     body_var = Variable(body_component)\n                     variables.add(body_var)\n                     body.append(body_var)\n-                elif body_component not in EPSILON_SYMBOLS or type_component \\\n-                        == \"TER\":\n+                elif type_component == \"TER\" or (type_component == \"\" and \\\n+                        body_component not in EPSILON_SYMBOLS):\n                     body_ter = Terminal(body_component)\n                     terminals.add(body_ter)\n                     body.append(body_ter)\n",
  "is_truncated": false
}

Now let's run the reproduction test again.

{
  "command": "python3 - <<'PY'\nfrom pyformlang.cfg import CFG, Production, Terminal, Variable\n\ndef test_from_text(text, expected_vars, expected_terms, expected_prods):\n    cfg = CFG.from_text(text)\n    print(f\"Text: {text}\")\n    print(f\"Expected Vars: {expected_vars}, Actual: {cfg.variables}\")\n    print(f\"Expected Terms: {expected_terms}, Actual: {cfg.terminals}\")\n    print(f\"Expected Prods: {expected_prods}, Actual: {cfg.productions}\")\n    assert cfg.variables == expected_vars\n    assert cfg.terminals == expected_terms\n    assert cfg.productions == expected_prods\n    print(\"SUCCESS\")\n    print(\"-\" * 20)\n\n# Case 1: Terminal starting with Uppercase (The reported bug)\ntest_from_text('S -> \"TER:A\"', {\"S\"}, {\"A\"}, {Production(Variable(\"S\"), (Terminal(\"A\"),))})\n\n# Case 2: Variable starting with lowercase\ntest_from_text('S -> \"VAR:a\"', {\"S\", \"a\"}, set(), {Production(Variable(\"S\"), (Variable(\"a\"),))})\n\n# Case 3: Ordinary variable and terminal\ntest_from_text('S -> A a', {\"S\", \"A\"}, {\"a\"}, {Production(Variable(\"S\"), (Variable(\"A\"), Terminal(\"a\")))})\n\n# Case 4: Epsilon symbol\ntest_from_text('S -> epsilon', {\"S\"}, set(), {Production(Variable(\"S\"), ())})\n\nprint(\"ALL TESTS PASSED\")\nPY\n"
}

{
  "status": "error",
  "error_type": "CommandError",
  "error_message": "Traceback (most recent call last):\n  File \"<stdin>\", line 16, in <module>\n  File \"<stdin>\", line 10, in test_from_text\nAssertionError\n",
  "details": {
    "stdout": "Text: S -> \"TER:A\"\nExpected Vars: {'S'}, Actual: {Variable(S)}\nExpected Terms: {'A'}, Actual: {Terminal(A)}\nExpected Prods: {S -> Terminal(A)}, Actual: {S -> Terminal(A)}\n",
    "stderr": "Traceback (most recent call last):\n  File \"<stdin>\", line 16, in <module>\n  File \"<stdin>\", line 10, in test_from_text\nAssertionError\n",
    "exit_code": 1
  }
}

Wait, look at the `AssertionError`:
```
Text: S -> "TER:A"
Expected Vars: {'S'}, Actual: {Variable(S)}
Expected Terms: {'A'}, Actual: {Terminal(A)}
Expected Prods: {S -> Terminal(A)}, Actual: {S -> Terminal(A)}
```
The actual values are `Variable(S)` and `Terminal(A)`, while my expected values were `{"S"}` and `{"A"}`.
Wait, the `CFG` constructor handles strings.

In my test:
```python
test_from_text('S -> "TER:A"', {"S"}, {"A"}, {Production(Variable("S"), (Terminal("A"),))})
```
`expected_vars` is `{"S"}`.
`cfg.variables` is `{Variable(S)}`.
`{"S"} == {Variable(S)}` is likely False because `Variable` is a class.

Let's check `pyformlang/cfg/variable.py` and `pyformlang/cfg/terminal.py`.

{
  "command": "ls pyformlang/cfg/variable.py pyformlang/cfg/terminal.py"
}

{
  "status": "ok",
  "stdout": "pyformlang/cfg/terminal.py\npyformlang/cfg/variable.py\n",
  "stderr": "",
  "exit_code": 0
}

I should update my tests to use `Variable` and `Terminal` objects.

{
  "command": "python3 - <<'PY'\nfrom pyformlang.cfg import CFG, Production, Terminal, Variable\n\ndef test_from_text(text, expected_vars, expected_terms, expected_prods):\n    cfg = CFG.from_text(text)\n    print(f\"Text: {text}\")\n    print(f\"Expected Vars: {expected_vars}, Actual: {cfg.variables}\")\n    print(f\"Expected Terms: {expected_terms}, Actual: {cfg.terminals}\")\n    print(f\"Expected Prods: {expected_prods}, Actual: {cfg.productions}\")\n    assert cfg.variables == expected_vars\n    assert cfg.terminals == expected_terms\n    assert cfg.productions == expected_prods\n    print(\"SUCCESS\")\n    print(\"-\" * 20)\n\n# Case 1: Terminal starting with Uppercase\ntest_from_text('S -> \"TER:A\"', {Variable(\"S\")}, {Terminal(\"A\")}, {Production(Variable(\"S\"), (Terminal(\"A\"),))})\n\n# Case 2: Variable starting with lowercase\ntest_from_text('S -> \"VAR:a\"', {Variable(\"S\"), Variable(\"a\")}, set(), {Production(Variable(\"S\"), (Variable(\"a\"),))})\n\n# Case 3: Ordinary variable and terminal\ntest_from_text('S -> A a', {Variable(\"S\"), Variable(\"A\")}, {Terminal(\"a\")}, {Production(Variable(\"S\"), (Variable(\"A\"), Terminal(\"a\")))})\n\n# Case 4: Epsilon symbol\ntest_from_text('S -> epsilon', {Variable(\"S\")}, set(), {Production(Variable(\"S\"), ())})\n\nprint(\"ALL TESTS PASSED\")\nPY\n"
}

{
  "status": "ok",
  "stdout": "Text: S -> \"TER:A\"\nExpected Vars: {Variable(S)}, Actual: {Variable(S)}\nExpected Terms: {Terminal(A)}, Actual: {Terminal(A)}\nExpected Prods: {S -> Terminal(A)}, Actual: {S -> Terminal(A)}\nSUCCESS\n--------------------\nText: S -> \"VAR:a\"\nExpected Vars: {Variable(S), Variable(a)}, Actual: {Variable(S), Variable(a)}\nExpected Terms: set(), Actual: set()\nExpected Prods: {S -> a}, Actual: {S -> a}\nSUCCESS\n--------------------\nText: S -> A a\nExpected Vars: {Variable(S), Variable(A)}, Actual: {Variable(S), Variable(A)}\nExpected Terms: {Terminal(a)}, Actual: {Terminal(a)}\nExpected Prods: {S -> A Terminal(a)}, Actual: {S -> A Terminal(a)}\nSUCCESS\n--------------------\nText: S -> epsilon\nExpected Vars: {Variable(S)}, Actual: {Variable(S)}\nExpected Terms: set(), Actual: set()\nExpected Prods: {S -> }, Actual: {S -> }\nSUCCESS\n--------------------\nALL TESTS PASSED\n",
  "stderr": "",
  "exit_code": 0
}

The tests passed! Now let me double check if there are any other places where `from_text` logic is used or if there's a similar function in other classes.

The issue report mentioned CFGs.
I'll check if `FCFG` (Feature CFG) has a `from_text`.

{
  "command": "grep -rn --include=\"*.py\" \"def from_text\" pyformlang/fcfg/"
}

{
  "status": "ok",
  "stdout": "pyformlang/fcfg/feature_structure.py:245:    def from_text(cls, text: str, structure_variables: Dict[str, \"FeatureStructure\"] = None):\n",
  "stderr": "",
  "exit_code": 0
}

`pyformlang/fcfg/feature_structure.py` is not a grammar, it's a structure. Let's check `pyformlang/fcfg/fcfg.py`.

{
  "command": "grep -rn --include=\"*.py\" \"def from_text\" pyformlang/fcfg/fcfg.py"
}

{
  "status": "error",
  "error_type": "CommandError",
  "error_message": "",
  "details": {
    "stdout": "",
    "stderr": "",
    "exit_code": 1
  }
}

Okay, `FCFG` doesn't seem to have `from_text` in `fcfg.py`.

Wait, let me check all files in `pyformlang/cfg` just in case.

{
  "command": "grep -rn --include=\"*.py\" \"from_text\" pyformlang/cfg/"
}

{
  "status": "ok",
  "stdout": "pyformlang/cfg/cfg.py:1028:    def from_text(cls, text, start_symbol=Variable(\"S\")):\npyformlang/cfg/tests/test_cfg.py:752:    def test_from_text(self):\npyformlang/cfg/tests/test_cfg.py:757:        cfg = CFG.from_text(text)\npyformlang/cfg/tests/test_cfg.py:763:    def test_from_text2(self):\npyformlang/cfg/tests/test_cfg.py:768:        cfg = CFG.from_text(text)\npyformlang/cfg/tests/test_cfg.py:772:    def test_from_text_union(self):\npyformlang/cfg/tests/test_cfg.py:776:        cfg = CFG.from_text(text)\npyformlang/cfg/tests/test_cfg.py:781:        cfg = CFG.from_text(text)\npyformlang/cfg/tests/test_cfg.py:787:        cfg = CFG.from_text(text)\npyformlang/cfg/tests/test_cfg.py:799:        cfg = CFG.from_text(text, start_symbol=\"S1\")\npyformlang/cfg/tests/test_cfg.py:804:        cfg = CFG.from_text(text, start_symbol=\"E\")\npyformlang/cfg/tests/test_cfg.py:815:        cfg = CFG.from_text(text, start_symbol=\"E\")\npyformlang/cfg/tests/test_cfg.py:825:        text_result = CFG.from_text(text, start_symbol=\"E\").to_text()\npyformlang/cfg/tests/test_cfg.py:834:        cfg = CFG.from_text(\"S -> a S b | a b\")\npyformlang/cfg/tests/test_cfg.py:838:        new_cfg = CFG.from_text(new_text)\npyformlang/cfg/tests/test_cfg.py:842:        cfg = CFG.from_text(\"S -> a S b | a b epsilon\")\npyformlang/cfg/tests/test_recursive_decent_parser.py:12:    cfg = CFG.from_text(\"\"\"\npyformlang/cfg/tests/test_recursive_decent_parser.py:59:        cfg = CFG.from_text(\"\"\"\npyformlang/cfg/tests/test_llone_parser.py:24:        cfg = CFG.from_text(text)\npyformlang/cfg/tests/test_llone_parser.py:47:        cfg = CFG.from_text(text)\npyformlang/cfg/tests/test_llone_parser.py:65:        cfg = CFG.from_text(text, start_symbol=\"E\")\npyformlang/cfg/tests/test_llone_parser.py:88:        cfg = CFG.from_text(text)\npyformlang/cfg/tests/test_llone_parser.py:104:        cfg = CFG.from_text(text, start_symbol=\"E\")\npyformlang/cfg/tests/test_llone_parser.py:128:        cfg = CFG.from_text(text, start_symbol=\"E\")\npyformlang/cfg/tests/test_llone_parser.py:148:        cfg = CFG.from_text(text, start_symbol=\"E\")\npyformlang/cfg/tests/test_llone_parser.py:159:        cfg = CFG.from_text(text, start_symbol=\"E\")\npyformlang/cfg/tests/test_llone_parser.py:165:        cfg = CFG.from_text(text, start_symbol=\"E\")\npyformlang/cfg/tests/test_llone_parser.py:174:        cfg = CFG.from_text(text, start_symbol=\"E\")\npyformlang/cfg/tests/test_llone_parser.py:201:        cfg = CFG.from_text(text, start_symbol=\"E\")\npyformlang/cfg/tests/test_llone_parser.py:235:        cfg = CFG.from_text(text, start_symbol=\"E\")\npyformlang/cfg/tests/test_llone_parser.py:243:        cfg = CFG.from_text(\"\"\"\n",
  "stderr": "",
  "exit_code": 0
}

I have fixed the issue in `pyformlang/cfg/cfg.py`. I have verified it with a reproduction script.

Final check on the diff:
```python
-                if body_component[0] in string.ascii_uppercase or \
-                        type_component == "VAR":
+                if type_component == "VAR" or (type_component == "" and \
+                        body_component[0] in string.ascii_uppercase):
                     body_var = Variable(body_component)
                     variables.add(body_var)
                     body.append(body_var)
-                elif body_component not in EPSILON_SYMBOLS or type_component \
-                        == "TER":
+                elif type_component == "TER" or (type_component == "" and \
+                        body_component not in EPSILON_SYMBOLS):
                     body_ter = Terminal(body_component)
                     terminals.add(body_ter)
                     body.append(body_ter)
```

This looks correct. If `type_component` is `VAR`, it's always a variable. If it's `TER`, it's always a terminal. If it's `""`, then it uses the uppercase/epsilon rules.

Wait, let's check if `S -> "TER:A"` results in `Variable(S)` being the start symbol.
In `_read_line`:
```python
        head_s, body_s = line.split("->")
        head_text = head_s.strip()
        if is_special_text(head_text):
            head_text = head_text[5:-1]
        head = Variable(head_text)
        variables.add(head)
```
`head_text` for `S -> "TER:A"` is `S`. `is_special_text("S")` is False. `head` becomes `Variable("S")`.
Then in `from_text`:
```python
        return cls(variables=variables, terminals=terminals,
                   productions=productions, start_symbol=start_symbol)
```
The `CFG` constructor:
```python
        if start_symbol is not None:
            start_symbol = to_variable(start_symbol)
        self._start_symbol = start_symbol
        if start_symbol is not None:
            self._variables.add(start_symbol)
```
If `start_symbol` was the default `Variable("S")`, it's already a `Variable`.

Everything seems solid.

One more thing: the `is_special_text` implementation:
```python
def is_special_text(text):
    """ Check if the input is given an explicit type """
    return len(text) > 5 and \
        (text[0:5] == '"VAR:' or text[0:5] == '"TER:') and \
        text[-1] == '"'
```
For `"TER:A"`, `len` is 7. `text[0:5]` is `"TER:`. `text[-1]` is `"`. Returns True.
Then in `_read_line`:
```python
                if is_special_text(body_component):
                    type_component = body_component[1:4]
                    body_component = body_component[5:-1]
```
`body_component[1:4]` of `"TER:A"` is `TER`.
`body_component[5:-1]` of `"TER:A"` is `A`.
So `type_component` is `"TER"` and `body_component` is `"A"`. Correct.

Now let's run existing tests for `CFG.from_text`.

{
  "command": "pytest pyformlang/cfg/tests/test_cfg.py -k \"test_from_text\" -q --tb=short --no-header"
}

{
  "status": "ok",
  "stdout": "...                                                                      [100%]\n3 passed, 43 deselected in 0.24s\n",
  "stderr": "",
  "exit_code": 0
}