Package tipy :: Module cntxt :: Class ContextChangeDetector

Class ContextChangeDetector

object --+
         |
        ContextChangeDetector

Detect context change.

A context change can occure when some special characters appear in the buffers:

Word characters indicate that the current token is a (partial) word.
Blankspaces indicate the separations between two words. They mark the end of the current token.
Separators indicate a separation between two words. The dot separator mark the end of the sentence (and of the token) so the next token and suggestions should begin with an uppercase letter.
Special characters are non-printable characters such as backspace and arrow keys which are used to modify the input buffers.

It is important to detect context change because some operations such as n-gram learning from input or suggested words suppression have to be carried out upon context changes.

Class Hierarchy for ContextChangeDetector

Instance Methods

[hide private]

__init__(self, lowercase, config)
ContextChangeDetector creator.

source code

update_monitored_scope(self, string)
Move the monitored scope according to the string length.

source code

boolean

context_change(self, leftBuffer)
Check if the context has changed.

source code

list

change(self, leftBuffer)
Return the (part of the) token(s) appearing after a change.

source code

Inherited from object: __delattr__, __format__, __getattribute__, __hash__, __new__, __reduce__, __reduce_ex__, __repr__, __setattr__, __sizeof__, __str__, __subclasshook__

Properties

[hide private]

Inherited from object: __class__

Method Details

[hide private]

init(self, lowercase, config)
(Constructor)

source code

ContextChangeDetector creator.

Parameters:

config (drvr.Configuration) - It is used to retrieve the ContextMonitor settings from the configuration file.
lowercase (boolean) - Indicate if the tokens should be convert to lowercase.

Overrides: object.__init__

update_monitored_scope(self, string)

source code

Move the monitored scope according to the string length.

Parameters:

string (str) - Every characters inputed in the monitored buffer.

context_change(self, leftBuffer)

source code

Check if the context has changed.

To determine if a context change occure or not it is important to scan the input left buffer and the monitored scope. A change occure if:

The monitored scope is not part of the left buffer.
The monitored scope is part of the left buffer and a separator character appear in the left buffer part wich is not the monitored scope.

Parameters:

leftBuffer (str) - The input left buffer.

Returns: boolean

True or False weither the context has changed or not.

change(self, leftBuffer)

source code

Return the (part of the) token(s) appearing after a change.

When a change occure it is necessary to retrieve the characters forming (partial) tokens which have been inputed AFTER the change and this is what this method do. Weither a change occure or not is determined by self.context_change().

Parameters:

leftBuffer (str) - The input left buffer.

Returns: list

(Part of) tokens inputed after the last change.

Note: If no change have been registered yet then the leftBuffer is returned.

Class ContextChangeDetector

__init__(self, lowercase, config) (Constructor)

update_monitored_scope(self, string)

context_change(self, leftBuffer)

change(self, leftBuffer)

init(self, lowercase, config)
(Constructor)