Merge topic 'IsON_IsOFF_string_view'

4ff0bb054b cmSystemTools: Make IsInternallyOn, IsON and IsOff cm::string_view based
65d3ea2c7f cmAlgorithms: Make cmHasLiteral{Prefix,Suffix} cm::string_view based

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !3598

4 files changed, 109 insertions, 144 deletions

diff --git a/Source/cmAlgorithms.h b/Source/cmAlgorithms.h
index b4b480b..cf71052 100644
--- a/Source/cmAlgorithms.h
+++ b/Source/cmAlgorithms.h
@@ -19,44 +19,6 @@
 #include <utility>
 #include <vector>
 
-inline bool cmHasLiteralPrefixImpl(const std::string& str1, const char* str2,
-                                   size_t N)
-{
-  return strncmp(str1.c_str(), str2, N) == 0;
-}
-
-inline bool cmHasLiteralPrefixImpl(const char* str1, const char* str2,
-                                   size_t N)
-{
-  return strncmp(str1, str2, N) == 0;
-}
-
-inline bool cmHasLiteralSuffixImpl(const std::string& str1, const char* str2,
-                                   size_t N)
-{
-  size_t len = str1.size();
-  return len >= N && strcmp(str1.c_str() + len - N, str2) == 0;
-}
-
-inline bool cmHasLiteralSuffixImpl(const char* str1, const char* str2,
-                                   size_t N)
-{
-  size_t len = strlen(str1);
-  return len >= N && strcmp(str1 + len - N, str2) == 0;
-}
-
-template <typename T, size_t N>
-bool cmHasLiteralPrefix(const T& str1, const char (&str2)[N])
-{
-  return cmHasLiteralPrefixImpl(str1, str2, N - 1);
-}
-
-template <typename T, size_t N>
-bool cmHasLiteralSuffix(const T& str1, const char (&str2)[N])
-{
-  return cmHasLiteralSuffixImpl(str1, str2, N - 1);
-}
-
 struct cmStrCmp
 {
   cmStrCmp(const char* test)
@@ -327,6 +289,13 @@ inline bool cmHasPrefix(cm::string_view str, cm::string_view prefix)
   return str.compare(0, prefix.size(), prefix) == 0;
 }
 
+/** Returns true if string @a str starts with string @a prefix.  **/
+template <size_t N>
+inline bool cmHasLiteralPrefix(cm::string_view str, const char (&prefix)[N])
+{
+  return cmHasPrefix(str, cm::string_view(prefix, N - 1));
+}
+
 /** Returns true if string @a str ends with the character @a suffix.  **/
 inline bool cmHasSuffix(cm::string_view str, char suffix)
 {
@@ -340,6 +309,13 @@ inline bool cmHasSuffix(cm::string_view str, cm::string_view suffix)
     str.compare(str.size() - suffix.size(), suffix.size(), suffix) == 0;
 }
 
+/** Returns true if string @a str ends with string @a suffix.  **/
+template <size_t N>
+inline bool cmHasLiteralSuffix(cm::string_view str, const char (&suffix)[N])
+{
+  return cmHasSuffix(str, cm::string_view(suffix, N - 1));
+}
+
 /** Removes an existing suffix character of from the string @a str.  **/
 inline void cmStripSuffixIfExists(std::string& str, char suffix)
 {
diff --git a/Source/cmSourceFileLocation.cxx b/Source/cmSourceFileLocation.cxx
index acacba2..d887627 100644
--- a/Source/cmSourceFileLocation.cxx
+++ b/Source/cmSourceFileLocation.cxx
@@ -146,8 +146,7 @@ bool cmSourceFileLocation::MatchesAmbiguousExtension(
   // adding an extension.
   if (!(this->Name.size() > loc.Name.size() &&
         this->Name[loc.Name.size()] == '.' &&
-        cmHasLiteralPrefixImpl(this->Name.c_str(), loc.Name.c_str(),
-                               loc.Name.size()))) {
+        cmHasPrefix(this->Name, loc.Name))) {
     return false;
   }
 
diff --git a/Source/cmSystemTools.cxx b/Source/cmSystemTools.cxx
index 723f280..e824757 100644
--- a/Source/cmSystemTools.cxx
+++ b/Source/cmSystemTools.cxx
@@ -282,115 +282,85 @@ void cmSystemTools::ReportLastSystemError(const char* msg)
   cmSystemTools::Error(m);
 }
 
-bool cmSystemTools::IsInternallyOn(const char* val)
-{
-  if (!val) {
-    return false;
-  }
-  std::string v = val;
-  if (v.size() > 4) {
-    return false;
-  }
-
-  for (char& c : v) {
-    c = static_cast<char>(toupper(c));
+bool cmSystemTools::IsInternallyOn(cm::string_view val)
+{
+  return (val.size() == 4) &&           //
+    (val[0] == 'I' || val[0] == 'i') && //
+    (val[1] == '_') &&                  //
+    (val[2] == 'O' || val[2] == 'o') && //
+    (val[3] == 'N' || val[3] == 'n');
+}
+
+bool cmSystemTools::IsOn(cm::string_view val)
+{
+  switch (val.size()) {
+    case 1:
+      return val[0] == '1' || val[0] == 'Y' || val[0] == 'y';
+    case 2:
+      return                                //
+        (val[0] == 'O' || val[0] == 'o') && //
+        (val[1] == 'N' || val[1] == 'n');
+    case 3:
+      return                                //
+        (val[0] == 'Y' || val[0] == 'y') && //
+        (val[1] == 'E' || val[1] == 'e') && //
+        (val[2] == 'S' || val[2] == 's');
+    case 4:
+      return                                //
+        (val[0] == 'T' || val[0] == 't') && //
+        (val[1] == 'R' || val[1] == 'r') && //
+        (val[2] == 'U' || val[2] == 'u') && //
+        (val[3] == 'E' || val[3] == 'e');
+    default:
+      break;
   }
-  return v == "I_ON";
-}
 
-bool cmSystemTools::IsOn(const char* val)
-{
-  if (!val) {
-    return false;
-  }
-  /* clang-format off */
-  // "1"
-  if (val[0] == '1' && val[1] == '\0') {
-    return true;
-  }
-  // "ON"
-  if ((val[0] == 'O' || val[0] == 'o') &&
-      (val[1] == 'N' || val[1] == 'n') && val[2] == '\0') {
-    return true;
-  }
-  // "Y", "YES"
-  if ((val[0] == 'Y' || val[0] == 'y') && (val[1] == '\0' || (
-      (val[1] == 'E' || val[1] == 'e') &&
-      (val[2] == 'S' || val[2] == 's') && val[3] == '\0'))) {
-    return true;
-  }
-  // "TRUE"
-  if ((val[0] == 'T' || val[0] == 't') &&
-      (val[1] == 'R' || val[1] == 'r') &&
-      (val[2] == 'U' || val[2] == 'u') &&
-      (val[3] == 'E' || val[3] == 'e') && val[4] == '\0') {
-    return true;
-  }
-  /* clang-format on */
   return false;
 }
 
-bool cmSystemTools::IsOn(const std::string& val)
+bool cmSystemTools::IsNOTFOUND(cm::string_view val)
 {
-  return cmSystemTools::IsOn(val.c_str());
+  return (val == "NOTFOUND") || cmHasLiteralSuffix(val, "-NOTFOUND");
 }
 
-bool cmSystemTools::IsNOTFOUND(const char* val)
+bool cmSystemTools::IsOff(cm::string_view val)
 {
-  if (strcmp(val, "NOTFOUND") == 0) {
-    return true;
+  switch (val.size()) {
+    case 0:
+      return true;
+    case 1:
+      return val[0] == '0' || val[0] == 'N' || val[0] == 'n';
+    case 2:
+      return                                //
+        (val[0] == 'N' || val[0] == 'n') && //
+        (val[1] == 'O' || val[1] == 'o');
+    case 3:
+      return                                //
+        (val[0] == 'O' || val[0] == 'o') && //
+        (val[1] == 'F' || val[1] == 'f') && //
+        (val[2] == 'F' || val[2] == 'f');
+    case 5:
+      return                                //
+        (val[0] == 'F' || val[0] == 'f') && //
+        (val[1] == 'A' || val[1] == 'a') && //
+        (val[2] == 'L' || val[2] == 'l') && //
+        (val[3] == 'S' || val[3] == 's') && //
+        (val[4] == 'E' || val[4] == 'e');
+    case 6:
+      return                                //
+        (val[0] == 'I' || val[0] == 'i') && //
+        (val[1] == 'G' || val[1] == 'g') && //
+        (val[2] == 'N' || val[2] == 'n') && //
+        (val[3] == 'O' || val[3] == 'o') && //
+        (val[4] == 'R' || val[4] == 'r') && //
+        (val[5] == 'E' || val[5] == 'e');
+    default:
+      break;
   }
-  return cmHasLiteralSuffix(val, "-NOTFOUND");
-}
 
-bool cmSystemTools::IsOff(const char* val)
-{
-  // ""
-  if (!val || val[0] == '\0') {
-    return true;
-  }
-  /* clang-format off */
-  // "0"
-  if (val[0] == '0' && val[1] == '\0') {
-    return true;
-  }
-  // "OFF"
-  if ((val[0] == 'O' || val[0] == 'o') &&
-      (val[1] == 'F' || val[1] == 'f') &&
-      (val[2] == 'F' || val[2] == 'f') && val[3] == '\0') {
-    return true;
-  }
-  // "N", "NO"
-  if ((val[0] == 'N' || val[0] == 'n') && (val[1] == '\0' || (
-      (val[1] == 'O' || val[1] == 'o') && val[2] == '\0'))) {
-    return true;
-  }
-  // "FALSE"
-  if ((val[0] == 'F' || val[0] == 'f') &&
-      (val[1] == 'A' || val[1] == 'a') &&
-      (val[2] == 'L' || val[2] == 'l') &&
-      (val[3] == 'S' || val[3] == 's') &&
-      (val[4] == 'E' || val[4] == 'e') && val[5] == '\0') {
-    return true;
-  }
-  // "IGNORE"
-  if ((val[0] == 'I' || val[0] == 'i') &&
-      (val[1] == 'G' || val[1] == 'g') &&
-      (val[2] == 'N' || val[2] == 'n') &&
-      (val[3] == 'O' || val[3] == 'o') &&
-      (val[4] == 'R' || val[4] == 'r') &&
-      (val[5] == 'E' || val[5] == 'e') && val[6] == '\0') {
-    return true;
-  }
-  /* clang-format on */
   return cmSystemTools::IsNOTFOUND(val);
 }
 
-bool cmSystemTools::IsOff(const std::string& val)
-{
-  return cmSystemTools::IsOff(val.c_str());
-}
-
 void cmSystemTools::ParseWindowsCommandLine(const char* command,
                                             std::vector<std::string>& args)
 {
diff --git a/Source/cmSystemTools.h b/Source/cmSystemTools.h
index a9c03bd..5ce6a48 100644
--- a/Source/cmSystemTools.h
+++ b/Source/cmSystemTools.h
@@ -8,6 +8,7 @@
 #include "cmCryptoHash.h"
 #include "cmDuration.h"
 #include "cmProcessOutput.h"
+#include "cm_string_view.hxx"
 #include "cmsys/Process.h"
 #include "cmsys/SystemTools.hxx" // IWYU pragma: export
 #include <functional>
@@ -149,26 +150,45 @@ public:
    * forced this value. This is not the same as On, but this
    * may be considered as "internally switched on".
    */
-  static bool IsInternallyOn(const char* val);
+  static bool IsInternallyOn(cm::string_view val);
+  static inline bool IsInternallyOn(const char* val)
+  {
+    if (!val) {
+      return false;
+    }
+    return IsInternallyOn(cm::string_view(val));
+  }
+
   /**
-   * does a string indicate a true or on value ? This is not the same
-   * as ifdef.
+   * Does a string indicate a true or on value? This is not the same as ifdef.
    */
-  static bool IsOn(const char* val);
-  static bool IsOn(const std::string& val);
+  static bool IsOn(cm::string_view val);
+  inline static bool IsOn(const char* val)
+  {
+    if (!val) {
+      return false;
+    }
+    return IsOn(cm::string_view(val));
+  }
 
   /**
-   * does a string indicate a false or off value ? Note that this is
+   * Does a string indicate a false or off value ? Note that this is
    * not the same as !IsOn(...) because there are a number of
    * ambiguous values such as "/usr/local/bin" a path will result in
    * IsON and IsOff both returning false. Note that the special path
    * NOTFOUND, *-NOTFOUND or IGNORE will cause IsOff to return true.
    */
-  static bool IsOff(const char* val);
-  static bool IsOff(const std::string& val);
+  static bool IsOff(cm::string_view val);
+  inline static bool IsOff(const char* val)
+  {
+    if (!val) {
+      return true;
+    }
+    return IsOff(cm::string_view(val));
+  }
 
   //! Return true if value is NOTFOUND or ends in -NOTFOUND.
-  static bool IsNOTFOUND(const char* value);
+  static bool IsNOTFOUND(cm::string_view val);
   //! Return true if the path is a framework
   static bool IsPathToFramework(const std::string& value);