[Bf-blender-cvs] [6989f9be3d0] functions: add StringRef.substr method

[Jacques Lucke]

Commit: 6989f9be3d0fdb0d3071c60bfb04927976576e52
Author: Jacques Lucke
Date:   Mon Feb 10 09:53:33 2020 +0100
Branches: functions
https://developer.blender.org/rB6989f9be3d0fdb0d3071c60bfb04927976576e52

add StringRef.substr method

===================================================================

M	source/blender/blenlib/BLI_string_ref.h
M	tests/gtests/blenlib/BLI_string_ref_test.cc

===================================================================

diff --git a/source/blender/blenlib/BLI_string_ref.h b/source/blender/blenlib/BLI_string_ref.h
index 76163a2754c..54c2f0e7209 100644
--- a/source/blender/blenlib/BLI_string_ref.h
+++ b/source/blender/blenlib/BLI_string_ref.h
@@ -109,6 +109,8 @@ class StringRefBase {
    * Returns true when the string ends with the given suffix. Otherwise false.
    */
   bool endswith(StringRef suffix) const;
+
+  StringRef substr(uint start, uint size) const;
 };
 
 /**
@@ -242,6 +244,12 @@ inline bool StringRefBase::endswith(StringRef suffix) const
   return true;
 }
 
+inline StringRef StringRefBase::substr(uint start, uint size) const
+{
+  BLI_assert(start + size <= m_size);
+  return StringRef(m_data + start, size);
+}
+
 }  // namespace BLI
 
 #endif /* __BLI_STRING_REF_H__ */
diff --git a/tests/gtests/blenlib/BLI_string_ref_test.cc b/tests/gtests/blenlib/BLI_string_ref_test.cc
index 5605e10ac86..38a970455c0 100644
--- a/tests/gtests/blenlib/BLI_string_ref_test.cc
+++ b/tests/gtests/blenlib/BLI_string_ref_test.cc
@@ -228,3 +228,12 @@ TEST(string_ref, DropPrefix)
   EXPECT_EQ(ref2.size(), 1);
   EXPECT_EQ(ref2, "t");
 }
+
+TEST(string_ref, Substr)
+{
+  StringRef ref("hello world");
+  EXPECT_EQ(ref.substr(0, 5), "hello");
+  EXPECT_EQ(ref.substr(4, 0), "");
+  EXPECT_EQ(ref.substr(3, 4), "lo w");
+  EXPECT_EQ(ref.substr(6, 5), "world");
+}