[python] Support for grammars

- Translation rules can now be create programatically
- Grammars = list of translation rules can be used for translation
- Feature expectations on the hypergraph (inside_outside)

2 files changed, 15 insertions, 8 deletions

diff --git a/python/cdec/__init__.py b/python/cdec/__init__.py
index 0d7b8782..89c323ba 100644
--- a/python/cdec/__init__.py
+++ b/python/cdec/__init__.py
@@ -1,2 +1 @@
-from _cdec import Decoder, Lattice
-import score
+from _cdec import Decoder, Lattice, TRule, NT, NTRef
diff --git a/python/cdec/scfg/extractor.py b/python/cdec/scfg/extractor.py
index 0a45ddb8..1dfa2421 100644
--- a/python/cdec/scfg/extractor.py
+++ b/python/cdec/scfg/extractor.py
@@ -1,3 +1,5 @@
+import sys, os
+import re
 import StringIO
 from itertools import chain
 
@@ -32,7 +34,16 @@ class PhonyGrammar:
         pass
 
 class GrammarExtractor:
-    def __init__(self, config):
+    def __init__(self, cfg):
+        if isinstance(cfg, dict):
+            config = cfg
+        elif isinstance(cfg, str):
+            cfg_file = os.path.basename(cfg)
+            if not re.match(r'^\w+\.py$', cfg_file):
+                raise ValueError('Config must be a *.py file')
+            sys.path.append(os.path.dirname(cfg))
+            config =  __import__(cfg_file.replace('.py', '')).__dict__
+            sys.path.pop()
         alignment = calignment.Alignment(config['a_file'], from_binary=True)
         self.factory = rulefactory.HieroCachingRuleFactory(
                 # compiled alignment object (REQUIRED)
@@ -99,13 +110,10 @@ class GrammarExtractor:
         return str(out)
 
 def main(config):
-    sys.path.append(os.path.dirname(config))
-    module =  __import__(os.path.basename(config).replace('.py', ''))
-    extractor = GrammarExtractor(module.__dict__)
-    print extractor.grammar(next(sys.stdin))
+    extractor = GrammarExtractor(config)
+    sys.stdout.write(extractor.grammar(next(sys.stdin)))
 
 if __name__ == '__main__':
-    import sys, os
     if len(sys.argv) != 2 or not sys.argv[1].endswith('.py'):
         sys.stderr.write('Usage: %s config.py\n' % sys.argv[0])
         sys.exit(1)