refactor duplication (shouldSkip and skip_name) into a utility function

R=caryclark@google.com, reed@google.com

Committed: https://code.google.com/p/skia/source/detail?r=10280

Review URL: https://codereview.chromium.org/19807005

git-svn-id: http://skia.googlecode.com/svn/trunk@10317 2bbb7eff-a529-9590-31e7-b0007b416f81

2 files changed, 41 insertions, 1 deletions

diff --git a/tools/flags/SkCommandLineFlags.cpp b/tools/flags/SkCommandLineFlags.cpp
index ed8db8e705..b088b4e4d3 100644
--- a/tools/flags/SkCommandLineFlags.cpp
+++ b/tools/flags/SkCommandLineFlags.cpp
@@ -303,3 +303,34 @@ void SkCommandLineFlags::Parse(int argc, char** argv) {
         exit(0);
     }
 }
+
+bool SkCommandLineFlags::ShouldSkip(const SkTDArray<const char*>& strings, const char* name) {
+    int count = strings.count();
+    size_t testLen = strlen(name);
+    bool anyExclude = count == 0;
+    for (int i = 0; i < strings.count(); ++i) {
+        const char* matchName = strings[i];
+        size_t matchLen = strlen(matchName);
+        bool matchExclude, matchStart, matchEnd;
+        if ((matchExclude = matchName[0] == '~')) {
+            anyExclude = true;
+            matchName++;
+            matchLen--;
+        }
+        if ((matchStart = matchName[0] == '^')) {
+            matchName++;
+            matchLen--;
+        }
+        if ((matchEnd = matchName[matchLen - 1] == '$')) {
+            matchLen--;
+        }
+        if (matchStart ? (!matchEnd || matchLen == testLen)
+                && strncmp(name, matchName, matchLen) == 0
+                : matchEnd ? matchLen <= testLen
+                && strncmp(name + testLen - matchLen, matchName, matchLen) == 0
+                : strstr(name, matchName) != 0) {
+            return matchExclude;
+        }
+    }
+    return !anyExclude;
+}
diff --git a/tools/flags/SkCommandLineFlags.h b/tools/flags/SkCommandLineFlags.h
index d0e74502d8..51af933467 100644
--- a/tools/flags/SkCommandLineFlags.h
+++ b/tools/flags/SkCommandLineFlags.h
@@ -10,6 +10,7 @@
 
 #include "SkString.h"
 #include "SkTArray.h"
+#include "SkTDArray.h"
 
 /**
  *  Including this file (and compiling SkCommandLineFlags.cpp) provides command line
@@ -90,7 +91,6 @@
  *  strings) so that a flag can be followed by multiple parameters.
  */
 
-
 class SkFlagInfo;
 
 class SkCommandLineFlags {
@@ -108,6 +108,15 @@ public:
      */
     static void Parse(int argc, char** argv);
 
+    /* Takes a list of the form [~][^]match[$]
+     ~ causes a matching test to always be skipped
+     ^ requires the start of the test to match
+     $ requires the end of the test to match
+     ^ and $ requires an exact match
+     If a test does not match any list entry, it is skipped unless some list entry starts with ~
+    */
+    static bool ShouldSkip(const SkTDArray<const char*>& strings, const char* name);
+
     /**
      *  Custom class for holding the arguments for a string flag.
      *  Publicly only has accessors so the strings cannot be modified.