Support cascade deletion

api/s25_vertices.py

@@ -1,4 +1,4 @@
-from .operation import *
+from .database import *
 
 
 def get_vertex_schema(name: str) -> dict[str, dict[str, Any]]:
@@ -16,7 +16,7 @@ def get_vertex(name: str, link: str) -> dict[str, Any]:
     return { 'link': link, 'coords': cs }
 
 
-def set_vertex_cache(name: str, cs: ChangeSet) -> DbChangeSet:
+def set_vertex_cmd(name: str, cs: ChangeSet) -> DbChangeSet:
     link = cs.operations[0]['link']
 
     old = get_vertex(name, link)
@@ -44,34 +44,34 @@ def set_vertex_cache(name: str, cs: ChangeSet) -> DbChangeSet:
 
 
 def set_vertex(name: str, cs: ChangeSet) -> ChangeSet:
-    result = set_vertex_cache(name, cs)
+    result = set_vertex_cmd(name, cs)
     result.redo_cs[0] |= g_update_prefix
     result.undo_cs[0] |= g_update_prefix
     return execute_command(name, result)
 
 
-def add_vertex_cache(name: str, cs: ChangeSet) -> DbChangeSet:
-    result = set_vertex_cache(name, cs)
+def add_vertex_cmd(name: str, cs: ChangeSet) -> DbChangeSet:
+    result = set_vertex_cmd(name, cs)
     result.redo_cs[0] |= g_add_prefix
     result.undo_cs[0] |= g_delete_prefix
     return result
 
 
-def delete_vertex_cache(name: str, cs: ChangeSet) -> DbChangeSet:
+def delete_vertex_cmd(name: str, cs: ChangeSet) -> DbChangeSet:
     cs.operations[0]['coords'] = []
-    result = set_vertex_cache(name, cs)
+    result = set_vertex_cmd(name, cs)
     result.redo_cs[0] |= g_delete_prefix
     result.undo_cs[0] |= g_add_prefix
     return result
 
 
 def add_vertex(name: str, cs: ChangeSet) -> ChangeSet:
-    result = add_vertex_cache(name, cs)
+    result = add_vertex_cmd(name, cs)
     return execute_command(name, result)
 
 
 def delete_vertex(name: str, cs: ChangeSet) -> ChangeSet:
-    result = delete_vertex_cache(name, cs)
+    result = delete_vertex_cmd(name, cs)
     return execute_command(name, result)
 
 
@@ -102,3 +102,10 @@ def inp_out_vertex(name: str) -> list[str]:
         y = obj['y']
         lines.append(f"{link} {x} {y}")
     return lines
+
+
+def delete_vertex_by_link(name: str, link: str) -> ChangeSet:
+    row = try_read(name, f"select * from vertices where link = '{link}'")
+    if row == None:
+        return ChangeSet()
+    return ChangeSet(g_delete_prefix | {'type': 'vertex', 'link' : link})