/calc command implemented

davtelepot/__init__.py

@@ -11,7 +11,7 @@ __author__ = "Davide Testa"
 __email__ = "davide@davte.it"
 __credits__ = ["Marco Origlia", "Nick Lee @Nickoala"]
 __license__ = "GNU General Public License v3.0"
-__version__ = "2.5.14"
+__version__ = "2.5.15"
 __maintainer__ = "Davide Testa"
 __contact__ = "t.me/davte"
 

davtelepot/bot.py

@@ -2232,7 +2232,8 @@ class Bot(TelegramBot, ObjectWithDatabase, MultiLanguageObject):
                 handler=decorated_command_handler,
                 description=description,
                 authorization_level=authorization_level,
-                language_labelled_commands=language_labelled_commands
+                language_labelled_commands=language_labelled_commands,
+                aliases=aliases
             )
             if type(description) is dict:
                 self.messages['commands'][command] = dict(

davtelepot/messages.py

@@ -1008,6 +1008,75 @@ default_unknown_command_message = {
 }
 
 default_useful_tools_messages = {
+    'calculate_command': {
+        'description': {
+            'en': "Do calculations",
+            'it': "Calcola",
+        },
+        'help_section': None,
+        'instructions': {
+            'en': "🔢 <b>Calculator</b> 🧮\n\n"
+                  "Enter an algebraic expression after /calc to get its "
+                  "result, or use the command in reply to a message containing "
+                  "an expression, or use the keyboard below.\n\n"
+                  "- <code>ℹ️</code>: show information about special keys\n",
+            'it': "🔢 <b>Calcolatrice</b> 🧮\n\n"
+                  "Inserisci un'espressione algebrica dopo /calcola per "
+                  "ottenerne il risultato, oppure usa il comando in risposta, "
+                  "o ancora usa la tastiera qui sotto.\n\n"
+                  "- <code>ℹ️</code>: mostra informazioni sui tasti speciali\n",
+        },
+        'invalid_expression': {
+            'en': "Invalid expression: {error}",
+            'it': "Espressione non valida: {error}",
+        },
+        'language_labelled_commands': {
+            'en': "calculate",
+            'it': "calcola",
+        },
+        'message_input': {
+            'en': "🔢 <b>Calculator</b> 🧮\n\n"
+                  "<i>Enter an expression</i>",
+            'it': "🔢 <b>Calcolatrice</b> 🧮\n\n"
+                  "<i>Mandami l'espressione</i>",
+        },
+        'special_keys': {
+            'en': "<b>Special keys</b>\n"
+                  "- <code>**</code>: exponentiation\n"
+                  "- <code>//</code>: floor division\n"
+                  "- <code>mod</code>: modulus (remainder of division)\n"
+                  "- <code>MR</code>: result of last expression\n"
+                  "- <code>ℹ️</code>: show this help message\n"
+                  "- <code>💬</code>: write your expression in a message\n"
+                  "- <code>⬅️</code>: delete last character\n"
+                  "- <code>✅</code>: start a new line (and a new expression)\n",
+            'it': "<b>Tasti speciali</b>\n"
+                  "- <code>**</code>: elevamento a potenza\n"
+                  "- <code>//</code>: quoziente della divisione\n"
+                  "- <code>mod</code>: resto della divisione\n"
+                  "- <code>MR</code>: risultato dell'espressione precedente\n"
+                  "- <code>ℹ️</code>: mostra questo messaggio\n"
+                  "- <code>💬</code>: invia un messaggio con l'espressione\n"
+                  "- <code>⬅️</code>: cancella ultimo carattere\n"
+                  "- <code>✅</code>: vai a capo (inizia una nuova espressione)\n",
+        },
+        'use_buttons': {
+            'en': "Use buttons to enter an algebraic expression.\n\n"
+                  "<i>The input will be displayed after you stop typing for a "
+                  "while.</i>",
+            'it': "Usa i pulsanti per comporre un'espressione algebrica.\n\n"
+                  "<i>L'espressione verrà mostrata quando smetterai di "
+                  "digitare per un po'.</i>",
+        },
+        'result': {
+            'en': "🔢 <b>Calculator</b> 🧮\n\n"
+                  "<i>Expressions evaluation:</i>\n\n"
+                  "{expressions}",
+            'it': "🔢 <b>Calcolatrice</b> 🧮\n\n"
+                  "<i>Risultato delle espresisoni:</i>\n\n"
+                  "{expressions}",
+        },
+    },
     'info_command': {
         'description': {
             'en': "Use this command in reply to get information about a message",

davtelepot/useful_tools.py

@@ -1,43 +1,443 @@
 """General purpose functions for Telegram bots."""
 
 # Standard library
+import ast
+import asyncio
 import datetime
 import json
+import logging
+import operator
 
 from collections import OrderedDict
+from typing import List, Union
 
 # Project modules
 from .api import TelegramError
 from .bot import Bot
 from .messages import default_useful_tools_messages
-from .utilities import get_cleaned_text, recursive_dictionary_update, get_user
+from .utilities import (get_cleaned_text, get_user, make_button,
+                        make_inline_keyboard, recursive_dictionary_update, )
 
 
-async def _message_info_command(bot: Bot, update: dict, language: str):
-    """Provide information about selected update.
+def get_calc_buttons() -> OrderedDict:
+    buttons = OrderedDict()
+    buttons['**'] = dict(
+        value='**',
+        symbol='**',
+        order='A1',
+    )
+    buttons['//'] = dict(
+        value=' // ',
+        symbol='//',
+        order='A2',
+    )
+    buttons['%'] = dict(
+        value=' % ',
+        symbol='mod',
+        order='A3',
+    )
+    buttons['_'] = dict(
+        value='_',
+        symbol='MR',
+        order='B5',
+    )
+    buttons[0] = dict(
+        value='0',
+        symbol='0',
+        order='E1',
+    )
+    buttons[1] = dict(
+        value='1',
+        symbol='1',
+        order='D1',
+    )
+    buttons[2] = dict(
+        value='2',
+        symbol='2',
+        order='D2',
+    )
+    buttons[3] = dict(
+        value='3',
+        symbol='3',
+        order='D3',
+    )
+    buttons[4] = dict(
+        value='4',
+        symbol='4',
+        order='C1',
+    )
+    buttons[5] = dict(
+        value='5',
+        symbol='5',
+        order='C2',
+    )
+    buttons[6] = dict(
+        value='6',
+        symbol='6',
+        order='C3',
+    )
+    buttons[7] = dict(
+        value='7',
+        symbol='7',
+        order='B1',
+    )
+    buttons[8] = dict(
+        value='8',
+        symbol='8',
+        order='B2',
+    )
+    buttons[9] = dict(
+        value='9',
+        symbol='9',
+        order='B3',
+    )
+    buttons['+'] = dict(
+        value=' + ',
+        symbol='+',
+        order='B4',
+    )
+    buttons['-'] = dict(
+        value=' - ',
+        symbol='-',
+        order='C4',
+    )
+    buttons['*'] = dict(
+        value=' * ',
+        symbol='*',
+        order='D4',
+    )
+    buttons['/'] = dict(
+        value=' / ',
+        symbol='/',
+        order='E4',
+    )
+    buttons['.'] = dict(
+        value='.',
+        symbol='.',
+        order='E2',
+    )
+    buttons['thousands'] = dict(
+        value='000',
+        symbol='000',
+        order='E3',
+    )
+    buttons['end'] = dict(
+        value='\n',
+        symbol='✅',
+        order='F1',
+    )
+    buttons['del'] = dict(
+        value='del',
+        symbol='⬅️',
+        order='E5',
+    )
+    buttons['('] = dict(
+        value='(',
+        symbol='(️',
+        order='A4',
+    )
+    buttons[')'] = dict(
+        value=')',
+        symbol=')️',
+        order='A5',
+    )
+    buttons['info'] = dict(
+        value='info',
+        symbol='ℹ️️',
+        order='C5',
+    )
 
-    Selected update: the message `update` is sent in reply to. If `update` is
-        not a reply to anything, it gets selected.
-    The update containing the command, if sent in reply, is deleted.
-    """
-    if 'reply_to_message' in update:
-        selected_update = update['reply_to_message']
+    buttons['parser'] = dict(
+        value='parser',
+        symbol='💬️',
+        order='D5',
+    )
+
+    return buttons
+
+
+def get_operators() -> dict:
+    def multiply(a, b):
+        """Call operator.mul only if a and b are small enough."""
+        if abs(max(a, b)) > 10 ** 21:
+            raise Exception("Numbers were too large!")
+        return operator.mul(a, b)
+
+    def power(a, b):
+        """Call operator.pow only if a and b are small enough."""
+        if abs(a) > 1000 or abs(b) > 100:
+            raise Exception("Numbers were too large!")
+        return operator.pow(a, b)
+
+    return {
+        ast.Add: operator.add,
+        ast.Sub: operator.sub,
+        ast.Mult: multiply,
+        ast.Div: operator.truediv,
+        ast.Pow: power,
+        ast.FloorDiv: operator.floordiv,
+        ast.Mod: operator.mod
+    }
+
+
+calc_buttons = get_calc_buttons()
+operators = get_operators()
+
+
+def get_calculator_keyboard(additional_data: list = None):
+    if additional_data is None:
+        additional_data = []
+    return make_inline_keyboard(
+        [
+            make_button(
+                text=button['symbol'],
+                prefix='calc:///',
+                delimiter='|',
+                data=[*additional_data, code]
+            )
+            for code, button in sorted(calc_buttons.items(),
+                                       key=lambda b: b[1]['order'])
+        ],
+        5
+    )
+
+
+async def _calculate_button(bot: Bot,
+                            update: dict,
+                            user_record: OrderedDict,
+                            language: str,
+                            data: List[Union[int, str]]):
+    text, reply_markup = '', None
+    if len(data) < 2:
+        record_id = bot.db['calculations'].insert(
+            dict(
+                user_id=user_record['id'],
+                created=datetime.datetime.now()
+            )
+        )
+        data = [record_id, *data]
+        text = bot.get_message(
+            'useful_tools', 'calculate_command', 'use_buttons',
+            language=language
+        )
     else:
-        selected_update = update
-    await bot.send_message(
-        text=bot.get_message(
-            'useful_tools', 'info_command', 'result',
-            language=language,
-            info=json.dumps(selected_update, indent=2)
-        ),
-        update=update,
-        reply_to_message_id=selected_update['message_id'],
+        record_id = data[0]
+    reply_markup = get_calculator_keyboard(
+        additional_data=([record_id] if record_id else None)
     )
-    if selected_update != update:
+    if record_id not in bot.shared_data['calc']:
+        bot.shared_data['calc'][record_id] = []
+        asyncio.ensure_future(
+            calculate_session(bot=bot,
+                              record_id=record_id,
+                              language=language)
+        )
+    update['data'] = data
+    if len(data) and data[-1] in ('info', 'parser'):
+        command = data[-1]
+        if command == 'parser':
+            reply_markup = None
+            bot.set_individual_text_message_handler(
+                handler=_calculate_command,
+                user_id=user_record['telegram_id']
+            )
+        elif command == 'info':
+            reply_markup = make_inline_keyboard(
+                [
+                    make_button(
+                        text='Ok',
+                        prefix='calc:///',
+                        delimiter='|',
+                        data=[record_id, 'back']
+                    )
+                ]
+            )
+        text = bot.get_message(
+            'useful_tools', 'calculate_command', (
+                'special_keys' if command == 'info'
+                else 'message_input' if command == 'parser'
+                else ''
+            ),
+            language=language
+        )
+    else:
+        bot.shared_data['calc'][record_id].append(update)
+    # Edit the update with the button if a new text is specified
+    if not text:
+        return
+    return dict(
+        text='',
+        edit=dict(
+            text=text,
+            reply_markup=reply_markup
+        )
+    )
+
+
+def eval_(node):
+    """Evaluate ast nodes."""
+    if isinstance(node, ast.Num):  # <number>
+        return node.n
+    elif isinstance(node, ast.BinOp):  # <left> <operator> <right>
+        return operators[type(node.op)](eval_(node.left), eval_(node.right))
+    elif isinstance(node, ast.UnaryOp):  # <operator> <operand> e.g., -1
+        # noinspection PyArgumentList
+        return operators[type(node.op)](eval_(node.operand))
+    else:
+        raise Exception("Invalid operator")
+
+
+def evaluate_expression(expr):
+    """Evaluate expressions in a safe way."""
+    return eval_(
+        ast.parse(
+            expr,
+            mode='eval'
+        ).body
+    )
+
+
+def evaluate_expressions(bot: Bot,
+                         expressions: str,
+                         language: str = None) -> str:
+    """Evaluate a string containing lines of expressions.
+
+    `expressions` must be a string containing one expression per line.
+    """
+    line_result, result = 0, []
+    for line in expressions.split('\n'):
+        if not line:
+            continue
         try:
-            await bot.delete_message(update=update)
-        except TelegramError:
+            line_result = evaluate_expression(
+                line.replace('_', str(line_result))
+            )
+        except Exception as e:
+            line_result = bot.get_message(
+                'useful_tools', 'calculate_command', 'invalid_expression',
+                language=language,
+                error=e
+            )
+        result.append(
+            f"<code>{line}</code>\n<b>= {line_result}</b>"
+        )
+    return '\n\n'.join(result)
+
+
+async def calculate_session(bot: Bot,
+                            record_id: int,
+                            language: str,
+                            buffer_seconds: Union[int, float] = 1):
+    # Wait until input ends
+    queue = bot.shared_data['calc'][record_id]
+    queue_len = None
+    while queue_len != len(queue):
+        queue_len = len(queue)
+        await asyncio.sleep(buffer_seconds)
+    last_entry = max(queue, key=lambda u: u['id'], default=None)
+    # Delete record-associated queue
+    queue = queue.copy()
+    del bot.shared_data['calc'][record_id]
+
+    record = bot.db['calculations'].find_one(
+        id=record_id
+    )
+    if record is None:
+        logging.error("Invalid record identifier!")
+        return
+    expression = record['expression'] or ''
+    reply_markup = get_calculator_keyboard(additional_data=[record['id']])
+
+    # It would be nice to do:
+    # for update in sorted(queue, key=lambda u: u['id'])
+    # Alas, 'id's are not progressive... Telegram's fault!
+    for i, update in enumerate(queue):
+        if i % 5 == 0:
+            await asyncio.sleep(.1)
+        data = update['data']
+        if len(data) != 2:
+            logging.error(f"Something went wrong: invalid data received.\n{data}")
+            return
+        input_value = data[1]
+        if input_value == 'del':
+            expression = expression[:-1]
+        elif input_value == 'back':
             pass
+        elif input_value in calc_buttons:
+            expression += calc_buttons[input_value]['value']
+        else:
+            logging.error(f"Invalid input from calculator button: {input_value}")
+    if record:
+        bot.db['calculations'].update(
+            dict(
+                id=record['id'],
+                modified=datetime.datetime.now(),
+                expression=expression
+            ),
+            ['id']
+        )
+    if expression:
+        text = bot.get_message(
+            'useful_tools', 'calculate_command', 'result',
+            language=language,
+            expressions=evaluate_expressions(bot=bot,
+                                             expressions=expression,
+                                             language=language)
+        )
+    else:
+        text = bot.get_message(
+            'useful_tools', 'calculate_command', 'instructions',
+            language=language
+        )
+    if last_entry is None:
+        return
+    await bot.edit_message_text(
+        text=text,
+        update=last_entry,
+        reply_markup=reply_markup
+    )
+
+
+async def _calculate_command(bot: Bot,
+                             update: dict,
+                             user_record: OrderedDict,
+                             language: str,
+                             command_name: str = 'calc'):
+    if 'reply_to_message' in update:
+        update = update['reply_to_message']
+    command_aliases = [command_name]
+    if command_name in bot.commands:
+        command_aliases += list(
+            bot.commands[command_name]['language_labelled_commands'].values()
+        ) + bot.commands[command_name]['aliases']
+    text = get_cleaned_text(bot=bot,
+                            update=update,
+                            replace=command_aliases)
+    if not text:
+        text = bot.get_message(
+            'useful_tools', 'calculate_command', 'instructions',
+            language=language
+        )
+        reply_markup = get_calculator_keyboard()
+    else:
+        record_id = bot.db['calculations'].insert(
+            dict(
+                user_id=user_record['id'],
+                created=datetime.datetime.now(),
+                expression=text
+            )
+        )
+        text = bot.get_message(
+            'useful_tools', 'calculate_command', 'result',
+            language=language,
+            expressions=evaluate_expressions(bot=bot,
+                                             expressions=text,
+                                             language=language)
+        )
+        reply_markup = get_calculator_keyboard(additional_data=[record_id])
+    await bot.send_message(text=text,
+                           update=update,
+                           reply_markup=reply_markup)
 
 
 async def _length_command(bot: Bot, update: dict, user_record: OrderedDict):
@@ -82,6 +482,33 @@ async def _length_command(bot: Bot, update: dict, user_record: OrderedDict):
     )
 
 
+async def _message_info_command(bot: Bot, update: dict, language: str):
+    """Provide information about selected update.
+
+    Selected update: the message `update` is sent in reply to. If `update` is
+        not a reply to anything, it gets selected.
+    The update containing the command, if sent in reply, is deleted.
+    """
+    if 'reply_to_message' in update:
+        selected_update = update['reply_to_message']
+    else:
+        selected_update = update
+    await bot.send_message(
+        text=bot.get_message(
+            'useful_tools', 'info_command', 'result',
+            language=language,
+            info=json.dumps(selected_update, indent=2)
+        ),
+        update=update,
+        reply_to_message_id=selected_update['message_id'],
+    )
+    if selected_update != update:
+        try:
+            await bot.delete_message(update=update)
+        except TelegramError:
+            pass
+
+
 async def _ping_command(bot: Bot, update: dict):
     """Return `pong` only in private chat."""
     chat_id = bot.get_chat_id(update=update)
@@ -111,7 +538,7 @@ async def _when_command(bot: Bot, update: dict, language: str):
         when=date
     )
     if 'forward_date' in update:
-        original_datetime= (
+        original_datetime = (
             datetime.datetime.fromtimestamp(update['forward_date'])
             if 'forward_from' in update
             else None
@@ -150,6 +577,53 @@ def init(telegram_bot: Bot, useful_tools_messages=None):
         useful_tools_messages
     )
     telegram_bot.messages['useful_tools'] = useful_tools_messages
+    telegram_bot.shared_data['calc'] = dict()
+
+    if 'calculations' not in telegram_bot.db.tables:
+        types = telegram_bot.db.types
+        table = telegram_bot.db.create_table(
+            table_name='calculations'
+        )
+        table.create_column(
+            'user_id',
+            types.integer
+        )
+        table.create_column(
+            'created',
+            types.datetime
+        )
+        table.create_column(
+            'modified',
+            types.datetime
+        )
+        table.create_column(
+            'expression',
+            types.string
+        )
+
+    @telegram_bot.command(command='/calc',
+                          aliases=None,
+                          reply_keyboard_button=None,
+                          show_in_keyboard=False,
+                          **{key: val for key, val
+                             in useful_tools_messages['calculate_command'].items()
+                             if key in ('description', 'help_section',
+                                        'language_labelled_commands')},
+                          authorization_level='everybody')
+    async def calculate_command(bot, update, user_record, language):
+        return await _calculate_command(bot=bot,
+                                        update=update,
+                                        user_record=user_record,
+                                        language=language,
+                                        command_name='calc')
+
+    @telegram_bot.button(prefix='calc:///',
+                         separator='|',
+                         authorization_level='everybody')
+    async def calculate_button(bot, update, user_record, language, data):
+        return await _calculate_button(bot=bot, user_record=user_record,
+                                       update=update,
+                                       language=language, data=data)
 
     @telegram_bot.command(command='/info',
                           aliases=None,
@@ -159,7 +633,7 @@ def init(telegram_bot: Bot, useful_tools_messages=None):
                              in useful_tools_messages['info_command'].items()
                              if key in ('description', 'help_section',
                                         'language_labelled_commands')},
-                          authorization_level='moderator')
+                          authorization_level='everybody')
     async def message_info_command(bot, update, language):
         return await _message_info_command(bot=bot,
                                            update=update,