svn/trunk@6032

papers/acl-08/grammar1.py

+import nltk
+
+def parse(sent, grammar):
+    gr = nltk.cfg.parse_cfg(grammar)
+    parser = nltk.ChartParser(gr, nltk.parse.TD_STRATEGY)
+    trees = parser.nbest_parse(sent.split())
+    nltk.draw.draw_trees(*trees)
+
+grammar = """
+   S -> NP VP
+   VP -> V NP | VP PP
+   NP -> Det N | NP PP
+   PP -> P NP
+   NP -> 'I'
+   Det -> 'the' | 'a' | 'my'
+   N -> 'elephant' | 'pajamas' | 'man' | 'park' | 'telescope'
+   V -> 'shot' | 'saw'
+   P -> 'in' | 'on' | 'with'
+"""
+
+sent = 'I shot the elephant in my pajamas'
+parse(sent, grammar)

papers/acl-08/grammar2.py

+import nltk
+
+def parse(sent, grammar):
+    gr = nltk.cfg.parse_cfg(grammar)
+    parser = nltk.ChartParser(gr, nltk.parse.TD_STRATEGY)
+    trees = parser.nbest_parse(sent.split())
+    nltk.draw.draw_trees(*trees)
+
+grammar = """
+   S -> NP VP
+   VP -> V NP | VP PP
+   NP -> Det N | NP PP
+   PP -> P NP
+   NP -> 'I'
+   Det -> 'the' | 'a' | 'my'
+   N -> 'elephant' | 'pajamas' | 'man' | 'park' | 'telescope'
+   V -> 'shot' | 'saw'
+   P -> 'in' | 'on' | 'with'
+"""
+
+sent = 'I saw the man in the park with a telescope'
+parse(sent, grammar)

papers/acl-08/police.py

+import nltk
+
+def parse(sent, grammar):
+    gr = nltk.cfg.parse_cfg(grammar)
+    parser = nltk.ChartParser(gr, nltk.parse.TD_STRATEGY)
+    trees = parser.nbest_parse(sent.split())
+    nltk.draw.draw_trees(*trees)
+
+grammar = """
+    S -> NP V NP
+    NP -> NP Sbar
+    Sbar -> NP V
+    NP -> 'fish' | 'police'
+    V -> 'fish' | 'police'
+"""
+
+sent = 'police police police police police police police police police'
+parse(sent, grammar)
+