New code for applying edits to an EDL.

tests/test_edit.py

@@ -0,0 +1,54 @@
+from sourcing.span import Span
+from sourcing.edit import apply_edits
+import pytest
+
+def test_xanadoc_apply_delete_start():
+    spans = [Span('http://test/test', 0, 11)]
+
+    edits = [{'op': 'delete', 'start': 0, 'old': 'aaa'}]
+    spans = apply_edits(spans, edits)
+    assert spans == [Span('http://test/test', 3, 8)]
+
+def test_xanadoc_apply_delete_start_offset():
+    offset = 14
+    spans = [Span('http://test/test', offset, 11)]
+
+    edits = [{'op': 'delete', 'start': 0, 'old': 'aaa'}]
+    spans = apply_edits(spans, edits)
+    assert spans == [Span('http://test/test', offset + 3, 8)]
+
+def test_xanadoc_apply_delete_middle():
+    spans = [Span('http://test/test', 0, 11)]
+
+    edits = [{'op': 'delete', 'start': 4, 'old': 'bbb'}]
+    spans = apply_edits(spans, edits)
+    assert spans == [Span('http://test/test', 0, 4),
+                     Span('http://test/test', 7, 4)]
+
+def test_xanadoc_apply_delete_end():
+    spans = [Span('http://test/test', 0, 11)]
+
+    edits = [{'op': 'delete', 'start': 8, 'old': 'ccc'}]
+    spans = apply_edits(spans, edits)
+    assert spans == [Span('http://test/test', 0, 8)]
+
+def test_xanadoc_apply_delete_all():
+    spans = [Span('http://test/test', 0, 3)]
+
+    edits = [{'op': 'delete', 'start': 0, 'old': 'aaa'}]
+    spans = apply_edits(spans, edits)
+    assert spans == []
+
+def test_xanadoc_apply_insert_start():
+    existing_span = Span('http://test/test', 0, 8)
+    new_span = Span('http://test/new_span', 10, 4)
+    edits = [{'op': 'insert', 'start': 0, 'span': new_span}]
+    spans = apply_edits([existing_span], edits)
+    assert spans == [new_span, existing_span]
+
+def test_xanadoc_apply_insert_end():
+    existing_span = Span('http://test/test', 0, 8)
+    new_span = Span('http://test/new_span', 10, 4)
+    edits = [{'op': 'insert', 'start': 8, 'span': new_span}]
+    spans = apply_edits([existing_span], edits)
+    assert spans == [existing_span, new_span]