nltk_lite.contrib.mit.six863.parse.featurechart

Module featurechart

Extension of chart parsing implementation to handle grammars with feature structures as nodes.

Classes

FeatureTreeEdge
FIXME: out of date documentation

FeatureTopDownExpandRule
The @TopDownExpandRule specialised for feature-based grammars.

FeatureEarleyChartParse
A chart parser implementing the Earley parsing algorithm, allowing nonterminals that have features (known as Categories).

Functions

[hide private]

load_earley(filename, trace=1)
Load a grammar from a file, and build an Earley feature parser based on that grammar.

source code

demo()

source code

run_profile()

source code

Function Details

[hide private]

load_earley(filename, trace=1)

source code


Load a grammar from a file, and build an Earley feature parser based on
that grammar.

You can optionally specify a tracing level, for how much output you
want to see:

0: No output.
1: Show edges from scanner and completer rules (not predictor).
2 (default): Show all edges as they are added to the chart.
3: Show all edges, plus the results of successful unifications.
4: Show all edges, plus the results of all attempted unifications.
5: Show all edges, plus the results of all attempted unifications,
   including those with cached results.