1 files changed, 104 insertions, 0 deletions
diff --git a/layout/style/GenerateCSSPropsGenerated.py b/layout/style/GenerateCSSPropsGenerated.py
new file mode 100644
index 000000000..5038e9afe
--- /dev/null
+++ b/layout/style/GenerateCSSPropsGenerated.py
@@ -0,0 +1,104 @@
+# 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/.
+
+import sys
+import string
+import argparse
+import subprocess
+import buildconfig
+from mozbuild import shellutil
+
+def get_properties(preprocessorHeader):
+    cpp = list(buildconfig.substs['CPP'])
+    cpp += shellutil.split(buildconfig.substs['ACDEFINES'])
+    cpp.append(preprocessorHeader)
+    preprocessed = subprocess.check_output(cpp)
+    properties = [{"name":p[0], "prop":p[1], "id":p[2],
+                   "flags":p[3], "pref":p[4], "proptype":p[5]}
+                  for (i, p) in enumerate(eval(preprocessed))]
+
+    # Sort the list so that longhand and logical properties are intermingled
+    # first, shorthand properties follow, then aliases appear last.  This matches
+    # the order of the nsCSSPropertyID enum.
+
+    def property_compare(x, y):
+        property_order = {"longhand": 0, "logical": 0, "shorthand": 1, "alias": 2}
+        return property_order[x["proptype"]] - property_order[y["proptype"]]
+
+    properties = sorted(properties, cmp=property_compare)
+
+    for i, p in enumerate(properties):
+        p["index"] = i
+
+    # Record each property's IDL name.
+    for p in properties:
+        if "CSS_PROPERTY_INTERNAL" in p["flags"]:
+            p["idlname"] = None
+        else:
+            idl_name = p["prop"]
+            if not idl_name.startswith("Moz"):
+                idl_name = idl_name[0].lower() + idl_name[1:]
+            p["idlname"] = idl_name
+
+    return properties
+
+def generate_idl_names(properties):
+    names = []
+    for p in properties:
+        if p["proptype"] is "alias":
+            continue
+        if p["idlname"] is None:
+            names.append("  nullptr,  // %s" % p["name"])
+        else:
+            names.append('  "%s",' % p["idlname"])
+    return "\n".join(names)
+
+def generate_assertions(properties):
+    def enum(p):
+        if p["proptype"] is "alias":
+            return "eCSSPropertyAlias_%s" % p["prop"]
+        else:
+            return "eCSSProperty_%s" % p["id"]
+    msg = ('static_assert(%s == %d, "GenerateCSSPropsGenerated.py did not list '
+           'properties in nsCSSPropertyID order");')
+    return "\n".join(map(lambda p: msg % (enum(p), p["index"]), properties))
+
+def generate_idl_name_positions(properties):
+    # Skip aliases.
+    ps = filter(lambda p: p["proptype"] is not "alias", properties)
+
+    # Sort alphabetically by IDL name.
+    ps = sorted(ps, key=lambda p: p["idlname"])
+
+    # Annotate entries with the sorted position.
+    ps = [(p, position) for position, p in enumerate(ps)]
+
+    # Sort back to nsCSSPropertyID order.
+    ps = sorted(ps, key=lambda (p, position): p["index"])
+
+    return ",\n".join(map(lambda (p, position): "  %d" % position, ps))
+
+def generate(output, cppTemplate, preprocessorHeader):
+    cppFile = open(cppTemplate, "r")
+    cppTemplate = cppFile.read()
+    cppFile.close()
+
+    properties = get_properties(preprocessorHeader)
+    substitutions = {
+        "idl_names": generate_idl_names(properties),
+        "assertions": generate_assertions(properties),
+        "idl_name_positions": generate_idl_name_positions(properties),
+    }
+    output.write("/* THIS IS AN AUTOGENERATED FILE.  DO NOT EDIT */\n\n" +
+                 string.Template(cppTemplate).substitute(substitutions) + "\n")
+
+def main():
+    parser = argparse.ArgumentParser()
+    parser.add_argument('cppTemplate', help='CSS property file template')
+    parser.add_argument('preprocessorHeader', help='Header file to pass through the preprocessor')
+    args = parser.parse_args()
+    generate(sys.stdout, args.cppTemplate, args.preprocessorHeader)
+
+if __name__ == '__main__':
+    main()