util/TemplateString: new utility library
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Max Kellermann
parent
37e25f93d6
commit
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@ -511,6 +511,7 @@ libutil_a_SOURCES = \
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src/util/FormatString.cxx src/util/FormatString.hxx \
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src/util/Tokenizer.cxx src/util/Tokenizer.hxx \
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src/util/TextFile.hxx \
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src/util/TemplateString.hxx \
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src/util/TimeParser.cxx src/util/TimeParser.hxx \
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src/util/UriUtil.cxx src/util/UriUtil.hxx \
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src/util/Manual.hxx \
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@ -0,0 +1,126 @@
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/*
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* Copyright (C) 2015-2016 Max Kellermann <max.kellermann@gmail.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef TEMPLATE_STRING_HXX
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#define TEMPLATE_STRING_HXX
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#include <stddef.h>
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namespace TemplateString {
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/**
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* Construct a null-terminated string from a list of chars.
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*/
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template<char... _value>
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struct Construct {
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static constexpr char value[] = {_value..., 0};
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static constexpr size_t size = sizeof...(_value);
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};
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template<char... _value>
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constexpr char Construct<_value...>::value[];
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/**
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* An empty string.
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*/
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struct Empty : Construct<> {};
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/**
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* A string consisting of a single character.
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*/
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template<char ch>
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struct CharAsString : Construct<ch> {};
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/**
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* Invoke #F, pass all characters in #src from #i to #length
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* as variadic arguments.
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*/
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template<template<char...> class F,
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const char *src, size_t length, size_t i,
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char... _value>
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struct VariadicChars : VariadicChars<F, src, length - 1, i + 1, _value..., src[i]> {
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static_assert(length > 0, "Wrong length");
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};
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template<template<char...> class F,
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const char *src, size_t length,
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char... _value>
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struct VariadicChars<F, src, 0, length, _value...> : F<_value...> {};
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/**
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* Like #VariadicChars, but pass an additional argument to #F.
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*/
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template<template<typename Arg, char...> class F, typename Arg,
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const char *src, size_t length, size_t i,
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char... _value>
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struct VariadicChars1 : VariadicChars1<F, Arg,
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src, length - 1, i + 1, _value..., src[i]> {
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static_assert(length > 0, "Wrong length");
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};
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template<template<typename Arg, char...> class F, typename Arg,
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const char *src, size_t length,
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char... _value>
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struct VariadicChars1<F, Arg, src, 0, length, _value...> : F<Arg, _value...> {};
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template<const char *src, size_t length, char... value>
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struct _BuildString : VariadicChars<Construct, src, length, 0,
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value...> {};
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template<char ch, typename S>
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struct InsertBefore : _BuildString<S::value, S::size, ch> {};
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/**
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* Concatenate several strings.
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*/
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template<typename... Args>
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struct Concat;
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template<typename First, typename Second, typename... Args>
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struct _Concat : Concat<Concat<First, Second>, Args...> {};
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template<typename... Args>
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struct Concat : _Concat<Args...> {};
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template<typename Second, char... _value>
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struct _Concat2 : _BuildString<Second::value, Second::size,
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_value...> {};
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template<typename First, typename Second>
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struct Concat<First, Second>
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:VariadicChars1<_Concat2, Second,
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First::value, First::size, 0> {};
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template<typename First>
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struct Concat<First> : First {};
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template<>
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struct Concat<> : Empty {};
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};
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#endif
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