ENH: provide string removeStart, removeEnd convenience methods

applications/test/string/Test-string.C

@@ -69,6 +69,16 @@ int main(int argc, char *argv[])
     Info<<"trimRight: " << stringOps::trimRight(test) << endl;
     Info<<"trim: " << stringOps::trim(test) << endl;
 
+    {
+        fileName test1("libFooBar.so");
+
+        Info<< nl;
+        Info<< "trim filename: " << test1 << nl;
+
+        test1.removeStart("lib");
+        Info<<"without leading 'lib': " << test1 << nl;
+    }
+
     Info<< nl;
     Info<<"camel-case => " << (word("camel") & "case") << nl;
     for (const auto& s : { " text with \"spaces'", "08/15 value" })

src/OpenFOAM/db/dynamicLibrary/dynamicCode/dynamicCode.C

@@ -93,12 +93,11 @@ void Foam::dynamicCode::checkSecurity
 Foam::word Foam::dynamicCode::libraryBaseName(const fileName& libPath)
 {
     word libName(libPath.name(true));
-    libName.erase(0, 3);    // Remove leading 'lib' from name
+    libName.removeStart("lib");  // Remove leading 'lib' from name
     return libName;
 }
 
 
-
 // * * * * * * * * * * * * Protected Member Functions  * * * * * * * * * * * //
 
 void Foam::dynamicCode::copyAndFilter

src/OpenFOAM/primitives/strings/string/string.C

@@ -3,7 +3,7 @@
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
     \\  /    A nd           | Copyright (C) 2011-2016 OpenFOAM Foundation
-     \\/     M anipulation  | Copyright (C) 2016 OpenCFD Ltd.
+     \\/     M anipulation  | Copyright (C) 2016-2017 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -167,6 +167,48 @@ Foam::string Foam::string::removeTrailing(const char character) const
 }
 
 
+bool Foam::string::removeStart(const std::string& text)
+{
+    const size_type txtLen = text.size();
+    if (!txtLen)
+    {
+        return true;
+    }
+
+    const size_type strLen = this->size();
+    if (strLen >= txtLen && !compare(0, txtLen, text))
+    {
+        this->erase(0, txtLen);
+        return true;
+    }
+    else
+    {
+        return false;
+    }
+}
+
+
+bool Foam::string::removeEnd(const std::string& text)
+{
+    const size_type txtLen = text.size();
+    if (!txtLen)
+    {
+        return true;
+    }
+
+    const size_type strLen = this->size();
+    if (strLen >= txtLen && !compare(strLen - txtLen, npos, text))
+    {
+        this->resize(strLen - txtLen);
+        return true;
+    }
+    else
+    {
+        return false;
+    }
+}
+
+
 bool Foam::string::startsWith(const std::string& text) const
 {
     const size_type strLen = this->size();

src/OpenFOAM/primitives/strings/string/string.H

@@ -3,7 +3,7 @@
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
     \\  /    A nd           | Copyright (C) 2011-2016 OpenFOAM Foundation
-     \\/     M anipulation  | Copyright (C) 2016 OpenCFD Ltd.
+     \\/     M anipulation  | Copyright (C) 2016-2017 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -201,6 +201,14 @@ public:
         //- Return string with trailing character removed
         string removeTrailing(const char character) const;
 
+        //- Remove the given text from the start of the string.
+        //  Always true if the removal occurred or the given text is empty.
+        bool removeStart(const std::string& text);
+
+        //- Remove the given text from the end of the string.
+        //  Always true if the removal occurred or the given text is empty.
+        bool removeEnd(const std::string& text);
+
         //- True if the string starts with the given text.
         //  Always true if the given text is empty or if the string
         //  is identical to the given text.