tree walker. builds, but not tested.

build-parser.sh

@@ -17,4 +17,4 @@
 #   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 mkdir -p python/generated 
-cd grammar && java -jar /home/marc/local/stow/antlr3.3/antlr-3.3-complete.jar -o ../python/generated/ OpenAir.g && cd -
+cd grammar && java -jar /home/marc/local/stow/antlr3.3/antlr-3.3-complete.jar -o ../python/generated/ OpenAir.g && java -jar /home/marc/local/stow/antlr3.3/antlr-3.3-complete.jar -o ../python/generated/ OpenAirWalker.g && cd -

grammar/OpenAirWalker.g

@@ -0,0 +1,69 @@
+tree grammar OpenAirWalker;
+
+options {
+    tokenVocab=OpenAir;
+    ASTLabelType=CommonTree;
+    backtrack=true;
+    memoize=true;
+    output=AST;
+    language=Python;
+}
+
+oair_file 
+	: ^(ZONES zone+)
+	;
+	
+zone	 	
+	: ^(ZONE aclass name ceiling floor ^(GEOMETRY geometry))
+	;
+
+aclass	: ^(CLASS  ('A'|'C'|'CTR'|'D'|'E'|'GP'|'P'|'Q'|'R'|'W'))
+	;
+	
+name	: ^(NAME AN_NAME)
+	;
+
+ceiling 	: altitude_specif
+	;
+
+floor	: altitude_specif
+	;
+
+frag_alti
+	: ^(BASE_ALTI INT ('F'|'M'))
+ 	;
+ 	
+altitude_specif
+	:
+	  ^(ALTI frag_alti ('AGL'|'AMSL'|'SFC'))
+	| ^(ALTI frag_alti? 'SFC')
+	| ^(ALTI FLEVEL)
+	| ^(ALTI 'UNL')
+	;
+	
+geometry
+	: 
+                         (single_point | circle_arc)* 
+	|  circle
+	;
+	
+single_point
+	: COORDS 
+	;
+
+circle_direction
+	:  ('+'|'-')
+	;
+	
+circle_center 
+	:  COORDS
+	;
+	
+circle_arc
+	:  ^(CIRCLE_ARC circle_center COORDS COORDS circle_direction?)
+	;
+	
+circle	
+	: 
+	   ^(CIRCLE circle_center (INT | FLOAT))
+	;