1 files changed, 67 insertions, 0 deletions
diff --git a/sgfyacc.py b/sgfyacc.py
new file mode 100755
index 0000000..e48e6b9
--- /dev/null
+++ b/sgfyacc.py
@@ -0,0 +1,67 @@
+#!/usr/bin/python
+
+# --------------------------------------
+# sgyacc.py
+""" Parser for SGF """
+# --------------------------------------
+
+import ply.yacc as yacc
+
+from imago.sgfParser.sgflex import tokens
+from imago.sgfParser.astNode import ASTNode, Property
+
+def p_tree(p):
+    '''tree : LPAREN node RPAREN
+            | LPAREN tree RPAREN'''
+    p[0] = p[2]
+
+def p_node_sequence(p):
+    '''node : node node'''
+    p[1].addToSequence(p[2])
+    p[0] = p[1]
+
+def p_node_tree(p):
+    '''node : node tree'''
+    p[1].children.append(p[2])
+    p[0] = p[1]
+
+def p_node(p):
+    'node : SCOLON'
+    p[0] = ASTNode()
+
+def p_node_prop(p):
+    'node : node property'
+    p[1].props[p[2].name] = p[2].value
+    p[0] = p[1]
+
+def p_property(p):
+    'property : PROPID PROPVALUE'
+    p[0] = Property(p[1], p[2])
+
+def p_property_value(p):
+    'property : property PROPVALUE'
+    p[1].addValue(p[2])
+    p[0] = p[1]
+
+def p_error(_):
+    """Error rule for syntax errors"""
+    print("Syntax error in input!")
+
+def main():
+
+    # Build the parser
+    parser = yacc.yacc()
+
+    s = ""
+    while True:
+        try:
+            s = input('calc > ')
+        except EOFError:
+            break
+        if not s:
+            continue
+        result = parser.parse(s)
+        print(result.toString())
+
+if __name__ == '__main__':
+    main()