Implement document matcher parser

1 files changed, 31 insertions, 0 deletions

diff --git a/mammoth/styles/parser/token_iterator.py b/mammoth/styles/parser/token_iterator.py
new file mode 100644
index 0000000..810e50b
--- /dev/null
+++ b/mammoth/styles/parser/token_iterator.py
@@ -0,0 +1,31 @@
+class TokenIterator(object):
+    def __init__(self, tokens):
+        self._tokens = tokens
+        self._index = 0
+    
+    def next_value(self, token_type):
+        return self._next(token_type).value
+    
+    def _next(self, token_type):
+        token = self._tokens[self._index]
+        if token.type == token_type:
+            self._index += 1
+            return token
+        else:
+            raise self._unexpected_token_type(token_type, token)
+    
+    def skip(self, token_type, token_value):
+        token = self._tokens[self._index]
+        if token.type == token_type and token.value == token_value:
+            self._index += 1
+            return True
+        else:
+            raise self._unexpected_token_type(token_type, token)
+    
+    def try_skip(self, token_type, token_value):
+        token = self._tokens[self._index]
+        if token.type == token_type and token.value == token_value:
+            self._index += 1
+            return True
+        else:
+            return False