1 files changed, 85 insertions, 0 deletions
diff --git a/layout/style/tools/cleanup_computed_getters.py b/layout/style/tools/cleanup_computed_getters.py
new file mode 100644
index 0000000000..301986751e
--- /dev/null
+++ b/layout/style/tools/cleanup_computed_getters.py
@@ -0,0 +1,85 @@
+#!/usr/bin/env python3
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+"""
+Script to remove unused getters in nsComputedDOMStyle.
+
+It needs to be run from the topsrcdir, and it requires passing in the objdir
+as first argument. It can only be run after nsComputedDOMStyleGenerated.inc
+is generated in the objdir.
+"""
+
+import re
+import sys
+
+from pathlib import Path
+
+if len(sys.argv) != 2:
+    print("Usage: {} objdir".format(sys.argv[0]))
+    exit(1)
+
+generated = Path(sys.argv[1]) / "layout" / "style"
+generated = generated / "nsComputedDOMStyleGenerated.inc"
+RE_GENERATED = re.compile(r"DoGet\w+")
+keeping = set()
+with generated.open() as f:
+    for line in f:
+        m = RE_GENERATED.search(line)
+        if m is not None:
+            keeping.add(m.group(0))
+
+HEADER = "layout/style/nsComputedDOMStyle.h"
+SOURCE = "layout/style/nsComputedDOMStyle.cpp"
+
+# We need to keep functions invoked by others
+RE_DEF = re.compile(r"nsComputedDOMStyle::(DoGet\w+)\(\)")
+RE_SRC = re.compile(r"\b(DoGet\w+)\(\)")
+with open(SOURCE, "r") as f:
+    for line in f:
+        m = RE_DEF.search(line)
+        if m is not None:
+            continue
+        m = RE_SRC.search(line)
+        if m is not None:
+            keeping.add(m.group(1))
+
+removing = set()
+remaining_lines = []
+with open(HEADER, "r") as f:
+    for line in f:
+        m = RE_SRC.search(line)
+        if m is not None:
+            name = m.group(1)
+            if name not in keeping:
+                print("Removing " + name)
+                removing.add(name)
+                continue
+        remaining_lines.append(line)
+
+with open(HEADER, "w", newline="") as f:
+    f.writelines(remaining_lines)
+
+remaining_lines = []
+is_removing = False
+with open(SOURCE, "r") as f:
+    for line in f:
+        if is_removing:
+            if line == "}\n":
+                is_removing = False
+            continue
+        m = RE_DEF.search(line)
+        if m is not None:
+            name = m.group(1)
+            if name in removing:
+                remaining_lines.pop()
+                if remaining_lines[-1] == "\n":
+                    remaining_lines.pop()
+                is_removing = True
+                continue
+        remaining_lines.append(line)
+
+with open(SOURCE, "w", newline="") as f:
+    f.writelines(remaining_lines)