1 files changed, 35 insertions, 0 deletions
diff --git a/lib/yaml/marker.py b/lib/yaml/marker.py
new file mode 100644
index 0000000..6ec12e6
--- /dev/null
+++ b/lib/yaml/marker.py
@@ -0,0 +1,35 @@
+
+class Marker:
+
+    def __init__(self, source, data, index, row, column):
+        self.source = source
+        self.data = data
+        self.index = index
+        self.row = row
+        self.column = column
+
+    def get_snippet(self, max_length=79):
+        if not isinstance(self.data, basestring):
+            return None
+        head = ''
+        start = self.index
+        while start > 0 and self.data[start-1] not in '\r\n':
+            start -= 1
+            if self.index-start > max_length/2-1:
+                head = ' ... '
+                start += 5
+                break
+        tail = ''
+        end = self.index
+        while end < len(self.data) and self.data[end] not in '\r\n':
+            end += 1
+            if end-self.index > max_length/2-1:
+                tail = ' ... '
+                end -= 5
+                break
+        snippet = self.data[start:end]
+        if isinstance(snippet, unicode):
+            snippet = snippet.encode('utf-8')
+        return head + snippet + tail + '\n'  \
+                + ' '*(self.index-start+len(head)) + '^' + '\n'
+