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ENH: add stringOps namespace with a collection of string-related ops
This commit is contained in:
Mark Olesen
359
src/OpenFOAM/primitives/strings/stringOps/stringOps.C
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359
src/OpenFOAM/primitives/strings/stringOps/stringOps.C
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/*---------------------------------------------------------------------------*\
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========= |
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\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
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\\ / O peration |
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\\ / A nd | Copyright (C) 2011-2011 OpenCFD Ltd.
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\\/ M anipulation |
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-------------------------------------------------------------------------------
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License
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This file is part of OpenFOAM.
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OpenFOAM is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
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\*---------------------------------------------------------------------------*/
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#include "stringOps.H"
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#include "OSspecific.H"
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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Foam::string Foam::stringOps::expand
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(
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const string& original,
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const HashTable<string, word, string::hash>& mapping,
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const char sigil
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)
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{
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string str(original);
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return inplaceExpand(str, mapping);
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}
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Foam::string& Foam::stringOps::inplaceExpand
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(
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string& s,
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const HashTable<string, word, string::hash>& mapping,
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const char sigil
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)
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{
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string::size_type begVar = 0;
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// Expand $VAR or ${VAR}
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// Repeat until nothing more is found
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while
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(
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(begVar = s.find(sigil, begVar)) != string::npos
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&& begVar < s.size()-1
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)
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{
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if (begVar == 0 || s[begVar-1] != '\\')
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{
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// Find end of first occurrence
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string::size_type endVar = begVar;
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string::size_type delim = 0;
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if (s[begVar+1] == '{')
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{
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endVar = s.find('}', begVar);
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delim = 1;
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}
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else
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{
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string::iterator iter = s.begin() + begVar + 1;
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while
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(
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iter != s.end()
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&& (isalnum(*iter) || *iter == '_')
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)
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{
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++iter;
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++endVar;
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}
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}
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if (endVar != string::npos && endVar != begVar)
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{
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string varName = s.substr
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(
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begVar + 1 + delim,
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endVar - begVar - 2*delim
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);
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HashTable<string, word, string::hash>::const_iterator fnd =
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mapping.find(varName);
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if (fnd != HashTable<string, word, string::hash>::end())
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{
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s.std::string::replace
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(
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begVar,
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endVar - begVar + 1,
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*fnd
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);
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begVar += (*fnd).size();
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}
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else
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{
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s.std::string::replace
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(
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begVar,
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endVar - begVar + 1,
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""
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);
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}
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}
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else
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{
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break;
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}
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}
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else
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{
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++begVar;
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}
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}
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return s;
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}
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Foam::string Foam::stringOps::expandEnv
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(
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const string& original,
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const bool recurse,
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const bool allowEmptyVar
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)
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{
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string str(original);
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return inplaceExpandEnv(str, recurse, allowEmptyVar);
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}
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// Expand all occurences of environment variables and initial tilde sequences
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Foam::string& Foam::stringOps::inplaceExpandEnv
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(
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string& s,
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const bool recurse,
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const bool allowEmptyVar
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)
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{
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string::size_type begVar = 0;
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// Expand $VARS
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// Repeat until nothing more is found
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while
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(
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(begVar = s.find('$', begVar)) != string::npos
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&& begVar < s.size()-1
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)
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{
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if (begVar == 0 || s[begVar-1] != '\\')
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{
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// Find end of first occurrence
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string::size_type endVar = begVar;
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string::size_type delim = 0;
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if (s[begVar+1] == '{')
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{
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endVar = s.find('}', begVar);
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delim = 1;
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}
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else
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{
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string::iterator iter = s.begin() + begVar + 1;
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while
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(
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iter != s.end()
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&& (isalnum(*iter) || *iter == '_')
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)
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{
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++iter;
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++endVar;
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}
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}
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if (endVar != string::npos && endVar != begVar)
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{
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string varName = s.substr
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(
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begVar + 1 + delim,
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endVar - begVar - 2*delim
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);
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string varValue = getEnv(varName);
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if (varValue.size())
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{
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if (recurse)
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{
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varValue.expand(recurse, allowEmptyVar);
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}
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s.std::string::replace
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(
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begVar,
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endVar - begVar + 1,
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varValue
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);
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begVar += varValue.size();
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}
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else if (allowEmptyVar)
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{
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s.std::string::replace
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(
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begVar,
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endVar - begVar + 1,
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""
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);
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}
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else
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{
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FatalErrorIn("string::expand(const bool, const bool)")
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<< "Unknown variable name " << varName << '.'
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<< exit(FatalError);
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}
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}
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else
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{
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break;
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}
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}
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else
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{
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++begVar;
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}
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}
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if (!s.empty())
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{
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if (s[0] == '~')
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{
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// Expand initial ~
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// ~/ => home directory
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// ~OpenFOAM => site/user OpenFOAM configuration directory
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// ~user => home directory for specified user
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word user;
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fileName file;
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if ((begVar = s.find('/')) != string::npos)
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{
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user = s.substr(1, begVar - 1);
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file = s.substr(begVar + 1);
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}
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else
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{
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user = s.substr(1);
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}
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// NB: be a bit lazy and expand ~unknownUser as an
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// empty string rather than leaving it untouched.
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// otherwise add extra test
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if (user == "OpenFOAM")
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{
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s = findEtcFile(file);
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}
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else
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{
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s = home(user)/file;
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}
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}
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else if (s[0] == '.')
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{
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// Expand a lone '.' and an initial './' into cwd
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if (s.size() == 1)
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{
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s = cwd();
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}
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else if (s[1] == '/')
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{
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s.std::string::replace(0, 1, cwd());
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}
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}
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}
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return s;
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}
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Foam::string Foam::stringOps::trimLeft(const string& s)
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{
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if (!s.empty())
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{
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string::size_type beg = 0;
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while (isspace(s[beg]))
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{
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++beg;
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}
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if (beg)
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{
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return s.substr(beg);
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}
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}
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return s;
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}
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Foam::string& Foam::stringOps::inplaceTrimLeft(string& s)
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{
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if (!s.empty())
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{
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string::size_type beg = 0;
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while (isspace(s[beg]))
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{
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++beg;
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}
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if (beg)
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{
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s.erase(0, beg);
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}
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}
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return s;
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}
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Foam::string Foam::stringOps::trimRight(const string& s)
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{
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notImplemented("string stringOps::trimRight(const string&)");
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return s;
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}
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Foam::string& Foam::stringOps::inplaceTrimRight(string& s)
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{
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notImplemented("string& stringOps::inplaceTrimRight(string&)");
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return s;
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}
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Foam::string Foam::stringOps::trim(const string& original)
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{
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notImplemented("string stringOps::trim(const string&)");
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return original;
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}
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Foam::string& Foam::stringOps::inplaceTrim(string& s)
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{
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notImplemented("string& stringOps::inplaceTrim(string&)");
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return s;
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}
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// ************************************************************************* //
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