74 lines
2.5 KiB
C++
74 lines
2.5 KiB
C++
// Copyright (c) Microsoft Corporation.
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// Licensed under the MIT license.
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#pragma once
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namespace til
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{
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namespace details
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{
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template<typename T>
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struct view_type_oracle
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{
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};
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template<>
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struct view_type_oracle<std::string>
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{
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using type = std::string_view;
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};
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template<>
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struct view_type_oracle<std::wstring>
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{
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using type = std::wstring_view;
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};
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}
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// Method Description:
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// - This is a function for finding all occurrences of a given string
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// `needle` in a larger string `haystack`, and replacing them with the
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// string `replacement`.
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// - This find/replace is done in-place, leaving `haystack` modified as a result.
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// Arguments:
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// - haystack: The string to find and replace in
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// - needle: The string to search for
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// - replacement: The string to replace `needle` with
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// Return Value:
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// - <none>
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template<typename T>
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void replace_needle_in_haystack_inplace(T& haystack,
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const typename details::view_type_oracle<T>::type& needle,
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const typename details::view_type_oracle<T>::type& replacement)
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{
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auto pos{ T::npos };
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while ((pos = haystack.rfind(needle, pos)) != T::npos)
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{
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haystack.replace(pos, needle.size(), replacement);
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}
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}
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// Method Description:
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// - This is a function for finding all occurrences of a given string
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// `needle` in a larger string `haystack`, and replacing them with the
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// string `replacement`.
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// - This find/replace is done on a copy of `haystack`, leaving `haystack`
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// unmodified, and returning a new string.
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// Arguments:
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// - haystack: The string to search for `needle` in.
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// - needle: The string to search for
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// - replacement: The string to replace `needle` with
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// Return Value:
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// - a copy of `haystack` with all instances of `needle` replaced with `replacement`.`
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template<typename T>
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T replace_needle_in_haystack(const T& haystack,
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const typename details::view_type_oracle<T>::type& needle,
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const typename details::view_type_oracle<T>::type& replacement)
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{
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std::basic_string<typename T::value_type> result{ haystack };
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replace_needle_in_haystack_inplace(result, needle, replacement);
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return result;
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}
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}
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