start files for lab2

lab2/scripts/gf_utils.py

@@ -0,0 +1,48 @@
+# import pgf
+
+def mk_fun(s):
+    s = '_'.join(s.split())  # spaces replaced by underscores
+    
+    if (s[0].isalpha() and
+        all(ord(c)<256 and (c.isdigit() or c.isalpha() or c in "_'")
+            for c in s)):  # test if legal GF identifier
+        return s
+    else:
+        return "'" + s.replace("'", "\\'") + "'"  # if not, single quotes make it legal
+
+
+def mk_fun_from_strs(ss):
+    return mk_fun('_'.join(ss))
+
+
+def quote(s):
+    return '"' + s + '"'
+
+
+def app(fun, args):
+    return ' '.join([fun, quote(args[0])] + args[1:])
+
+def empty_variants():
+    return 'variants {}'
+
+def mk_lin(oper, words, params):
+    return ' '.join([oper] + [quote(w) for w in words] + params) 
+
+
+def mk_cat_rule(cat):
+    return ' '.join(['cat', cat, ';\n'])
+
+
+def mk_fun_rule(fun, cat, comment=None):
+    co = '--' + comment if comment else ''
+    return ' '.join(['fun', fun, ':', cat, ';', co])
+
+
+def mk_lin_rule(fun, lin, comment=None):
+    co = '--' + comment if comment else ''
+    return ' '.join(['lin', fun, '=', lin, ';', co])
+
+
+def mk_lincat_rule(cat, lin):
+    return ' '.join(['lincat', cat, '=', lin, ';'])
+