scanner: Add --symbol-filter-cmd

Add the command line flag --symbol-filter-cmd to g-ir-scanner
which allows running symbol names through a filtering shell
command. The symbol is sent as stdin to the filter command
and expects a filtered result written to stdout.

https://bugzilla.gnome.org/show_bug.cgi?id=744534
Signed-off-by: Garrett Regier <garrett.regier@riftio.com>

2 files changed, 22 insertions, 2 deletions

diff --git a/giscanner/scannermain.py b/giscanner/scannermain.py
index b36284da..6be958ed 100755
--- a/giscanner/scannermain.py
+++ b/giscanner/scannermain.py
@@ -164,6 +164,11 @@ the latter is not specified.""")
     parser.add_option("", "--symbol-prefix",
                       action="append", dest="symbol_prefixes", default=[],
                       help="Remove this prefix from C symbols (function names)")
+    parser.add_option("", "--symbol-filter-cmd",
+                      action="store", dest="symbol_filter_cmd", default='',
+                      help='Filter symbols (function names) through the given '
+                           'shell command which will receive the symbol name as input '
+                           'to stdin and is expected to output the filtered results to stdout.')
     parser.add_option("", "--accept-unprefixed",
                       action="store_true", dest="accept_unprefixed", default=False,
                       help="""If specified, accept symbols and identifiers that do not
@@ -367,7 +372,8 @@ see --identifier-prefix and --symbol-prefix."""
 def create_transformer(namespace, options):
     transformer = Transformer(namespace,
                               accept_unprefixed=options.accept_unprefixed,
-                              identifier_filter_cmd=options.identifier_filter_cmd)
+                              identifier_filter_cmd=options.identifier_filter_cmd,
+                              symbol_filter_cmd=options.symbol_filter_cmd)
     transformer.set_include_paths(options.include_paths)
     if options.passthrough_gir:
         transformer.disable_cache()
diff --git a/giscanner/transformer.py b/giscanner/transformer.py
index b8bdfba2..6ae63897 100644
--- a/giscanner/transformer.py
+++ b/giscanner/transformer.py
@@ -50,7 +50,8 @@ if os.name != 'nt':
 class Transformer(object):
     namespace = property(lambda self: self._namespace)
 
-    def __init__(self, namespace, accept_unprefixed=False, identifier_filter_cmd=''):
+    def __init__(self, namespace, accept_unprefixed=False,
+                 identifier_filter_cmd='', symbol_filter_cmd=''):
         self._cachestore = CacheStore()
         self._accept_unprefixed = accept_unprefixed
         self._namespace = namespace
@@ -60,6 +61,7 @@ class Transformer(object):
         self._includepaths = []
         self._passthrough_mode = False
         self._identifier_filter_cmd = identifier_filter_cmd
+        self._symbol_filter_cmd = symbol_filter_cmd
 
         # Cache a list of struct/unions in C's "tag namespace". This helps
         # manage various orderings of typedefs and structs. See:
@@ -242,6 +244,18 @@ currently-scanned namespace is first."""
         return cmp(x[2], y[2])
 
     def _split_c_string_for_namespace_matches(self, name, is_identifier=False):
+        if not is_identifier and self._symbol_filter_cmd:
+            proc = subprocess.Popen(self._symbol_filter_cmd,
+                                    stdin=subprocess.PIPE,
+                                    stdout=subprocess.PIPE,
+                                    stderr=subprocess.PIPE,
+                                    shell=True)
+            _name = name
+            name, err = proc.communicate(name)
+            if proc.returncode:
+                raise ValueError('filter: "%s" exited: %d with error: %s' %
+                                 (self._symbol_filter_cmd, proc.returncode, err))
+
         matches = []  # Namespaces which might contain this name
         unprefixed_namespaces = []  # Namespaces with no prefix, last resort
         for ns in self._iter_namespaces():