Contextual19 Python Interpreter

This module provides you 2 classes to work with Ctx19.
You can read here about Contextual19.

ctx19.parsers.Contextual19Parser

This is just regular parser that takes rules in object representation.

Initialization

To initialize this class, just call it and take there rules in object representation:

from ctx19.parsers import Contextual19Parser
data = [
	{
		"if": ...,
		"then": ...
	},
	...
]
parser = Contextual19Parser(data)

Data you passed will be stored in parser.data.

Keywords

• bool saveContext (default is True)
  This parameter set transformation resistance of the rules. Suppose, we have this sentence:
  [{a:0}, {a:1}, {a:2}],
  and this rules (inline-written):
  #1: if previous a is 0 then a becomes 2,
  #2: if previous a is 1 then a becomes 3.
  After executing rule #1 sentence becomes:
  [{a:0}, {a:2}, {a:2}]
  Now the rule #2 is not appliable in this contexts. That is what means "transformation nonresistance". To make the rule #2 work, saveContext must be set to True and Ctx19 module will remember original sentence before applying rules (via deepcopy, so some additional memory will be needed).

Methods

• apply(sentence: list) -> list
  This method apply rules, stored in self.data to the sentence you passed.
  sentence is the list of dictionaries which represents tokens with their properties. It can look like this:

   [
   	{
   		"tense": "past",
   		"gender": "neutral",
   		"some_other_stuff": "other_value"
   	},
   	{
   		"tense": "future",
   		"voice": "active",
   		"another_property": "another_value"
   	}
   ]
  

  Missing properties will be skipped.
• save(filepath: str) -> void
  This method will simply save the rules stored in self.data into file you passed as filepath.

Private methods

There's also some methods that should not be used in your code, but they are widely used in Contextual19Parser.apply method and they can be useful in some cases.

• ruleIsAppliable(rule: dict, sentence: list, token: int) -> bool
  Check if the given rule is appliable to the tokenth token in the sentence. It'll check the context.

ctx19.parsers.Contextual19FileParser

This is the children of Contextual19Parser class with the changed initialization method.

Initialization

To initialize this parser just pass path to file with rules as the f parameter:

from ctx19.parsers import Contextual19FileParser
parser = Contextual19FileParser(open("path/to/file.ctx19"))

Keywords

• bool astext
  Set this to True to read text from f parameter instead of dealing with it as file. Example of use:

   data = '''
   if
   	...
   then
   	...
   ...
   '''
   parser = Contextual19FileParser(data, astext=True)
  

Since this is the Contextual19Parser children, it'll inherit all the parent methods, but one new private was added.

Private methods

• parseFile(void) -> void
  This will parse Contextual19 syntax from the file saved in self.file. You can change the file and call this method again.

Reading other object notation formats

From 1.2 version JSON and YAML parsers was moved in order to make ctx19 independent from other packages, but you can still do it yourself. Here's the example:

import json
from ctx19.parsers import Contextual19Parser
ctx = Contextual19Parser(json.load("path/to/file.json"))