Forseti Language

The system for determining the compliance of the text with the specified rules

How to install:

PyPi installation guide

pip install forseti-lang

How to use:

from forseti_lang.execute import execute_condition

condition = "TRUE AND FALSE"
text = ""
execute_condition(condition, text)  # False

All regular expressions should be in lowercase.

Supported logic operators

English

Below is a table of available logical operators and their description.

Russian

Forseti was developed for the analysis of texts in Russian. So, you can use:

Note

You can combine ru and eng operators.

Supported functions

We really lacked a simple syntax (but regular expressions did not allow us to achieve this), so we created our own functions!

Explanations

• |ll - length less (in characters)
• |lg - length great (in characters)
• |wN - word in distance N words
• |cN - word in distance N characters
• |N - alias of |wN
• |nearby - the word is nearby to the words word1 |nearby word2 | word3 | word4

Notes

• All function starts with special character: |. That's why we don't support it in regular expressions
• It is also forbidden to use the - character, it is used in the distance function
• The function of finding words at a distance will allow you to exclude constructions with a word at a distance, for example:

condition - "hello |w1 -world"
text      - "Hello beautiful world!"
result    - False

• You cannot combine two functions in one expression
• Text length and word distance functions don't work with negative values

Priority table

Examples

Checking the length of the text

from forseti_lang.execute import execute_condition

condition = '|ll5'
execute_condition(condition, "Hello world!")  # False
execute_condition(condition, "Hi")  # True

condition = '|lg5'
execute_condition(condition, "Hello world!")  # True
execute_condition(condition, "Hi")  # False

Checking the words distance

from forseti_lang.execute import execute_condition

condition = 'hello |w1 world'
execute_condition(condition, "Hello world!")  # True
execute_condition(condition, "Hello sunny world!")  # True
execute_condition(condition, "Hello dirty and dark world!")  # False

condition = 'hi\W? |c1 how are you'
execute_condition(condition, "Hi, how are you?")  # True
execute_condition(condition, "Hi, hmm.. how ary you?")  # False

condition = 'hello |1 world'
execute_condition(condition, "Hello world!")  # True

Checking nearby words

from forseti_lang.execute import execute_condition

condition = 'hello |nearby world | people | notalib'
execute_condition(condition, "Hello world!")  # True
execute_condition(condition, "Hello notalib!")  # True

Logic processing

from forseti_lang.execute import execute_condition

execute_condition("TRUE AND FALSE", "") # False
execute_condition("TRUE OR FALSE", "") # True
execute_condition("FALSE OR TRUE AND (TRUE OR FALSE)", "") # True
execute_condition("FALSE OR TRUE AND (FALSE AND TRUE)", "") # False
execute_condition("(TRUE OR FALSE) AND NOT (TRUE AND FALSE)", "") # TRUE

Difficult rules example

• короб AND NOT короб |2 конфет
• минимальн\w,{,2} |1 стоимо
• балл AND NOT (сн[ия]\w* балл ИЛИ 10\s?балл ИЛИ десять\sбаллов) AND |lg15