nltk_lite.parse.chart.LeafEdge

Package nltk_lite :: Package parse :: Module chart :: Class LeafEdge

[show private | hide private]

Type LeafEdge

object --+    
         |    
     EdgeI --+
             |
            LeafEdge

Known Subclasses:: ProbabilisticLeafEdge

An edge that records the fact that a leaf value is consistent with a word in the sentence. A leaf edge consists of:

An index, indicating the position of the word.
A leaf, specifying the word's content.

A leaf edge's left-hand side is its leaf value, and its right hand side is (). Its span is [index, index+1], and its dot position is 0.

Method Summary
	`__init__(self, leaf, index)` Construct a new `LeafEdge`.
	`__cmp__(self, other)`
	`__hash__(self)`
	`__repr__(self)`
	`__str__(self)`
`int`	`dot(self)` Return this edge's dot position, which indicates how much of the hypothesized structure is consistent with the sentence.
`int`	`end(self)` Return the end index of this edge's span.
`boolean`	`is_complete(self)` Return true if this edge's structure is fully consistent with the text.
`boolean`	`is_incomplete(self)` Return true if this edge's structure is partially consistent with the text.
`int`	`length(self)` Return the length of this edge's span.
	`lhs(self)` Return this edge's left-hand side, which specifies what kind of structure is hypothesized by this edge.
`Nonterminal` or terminal or `None`	`next(self)` Return the element of this edge's right-hand side that immediately follows its dot.
	`rhs(self)` Return this edge's right-hand side, which specifies the content of the structure hypothesized by this edge.
`(int, int)`	`span(self)` Return a tuple `(s,e)`, where `subtokens[s:e]` is the portion of the sentence that is consistent with this edge's structure.
`int`	`start(self)` Return the start index of this edge's span.
Inherited from `object`: `__delattr__`, `__getattribute__`, `__new__`, `__reduce__`, `__reduce_ex__`, `__setattr__`

Method Details

init(self, leaf, index)
(Constructor)

Construct a new LeafEdge.

Parameters:: leaf - The new edge's leaf value, specifying the word that is recorded by this edge.; index - The new edge's index, specifying the position of the word that is recorded by this edge.

Overrides:: nltk_lite.parse.chart.EdgeI.__init__

dot(self)

Returns:: This edge's dot position, which indicates how much of the hypothesized structure is consistent with the sentence. In particular, self.rhs[:dot] is consistent with subtoks[self.start():self.end()].
(type=int)

Overrides:: nltk_lite.parse.chart.EdgeI.dot (inherited documentation)

end(self)

Returns:: The end index of this edge's span.
(type=int)

Overrides:: nltk_lite.parse.chart.EdgeI.end (inherited documentation)

is_complete(self)

Returns:: True if this edge's structure is fully consistent with the text.
(type=boolean)

Overrides:: nltk_lite.parse.chart.EdgeI.is_complete (inherited documentation)

is_incomplete(self)

Returns:: True if this edge's structure is partially consistent with the text.
(type=boolean)

Overrides:: nltk_lite.parse.chart.EdgeI.is_incomplete (inherited documentation)

length(self)

Returns:: The length of this edge's span.
(type=int)

Overrides:: nltk_lite.parse.chart.EdgeI.length (inherited documentation)

lhs(self)

Returns:: This edge's left-hand side, which specifies what kind of structure is hypothesized by this edge.

Overrides:: nltk_lite.parse.chart.EdgeI.lhs (inherited documentation)

See Also: TreeEdge and LeafEdge for a description of the left-hand side values for each edge type.

next(self)

Returns:: The element of this edge's right-hand side that immediately follows its dot.
(type=Nonterminal or terminal or None)

Overrides:: nltk_lite.parse.chart.EdgeI.next (inherited documentation)

rhs(self)

Returns:: This edge's right-hand side, which specifies the content of the structure hypothesized by this edge.

Overrides:: nltk_lite.parse.chart.EdgeI.rhs (inherited documentation)

See Also: TreeEdge and LeafEdge for a description of the right-hand side values for each edge type.

span(self)

Returns:: A tuple (s,e), where subtokens[s:e] is the portion of the sentence that is consistent with this edge's structure.
(type=(int, int))

Overrides:: nltk_lite.parse.chart.EdgeI.span (inherited documentation)

start(self)

Returns:: The start index of this edge's span.
(type=int)

Overrides:: nltk_lite.parse.chart.EdgeI.start (inherited documentation)

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