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This helper uses spanparsing::Split internally and enables to replace all calls to boost::split where only a single separator is passed. Co-authored-by: Martin Ankerl <Martin.Ankerl@gmail.com> Co-authored-by: MarcoFalke <falke.marco@gmail.com>
65 lines
2 KiB
C++
65 lines
2 KiB
C++
// Copyright (c) 2018-2019 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#ifndef BITCOIN_UTIL_SPANPARSING_H
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#define BITCOIN_UTIL_SPANPARSING_H
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#include <span.h>
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#include <string>
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#include <vector>
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namespace spanparsing {
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/** Parse a constant.
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*
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* If sp's initial part matches str, sp is updated to skip that part, and true is returned.
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* Otherwise sp is unmodified and false is returned.
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*/
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bool Const(const std::string& str, Span<const char>& sp);
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/** Parse a function call.
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*
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* If sp's initial part matches str + "(", and sp ends with ")", sp is updated to be the
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* section between the braces, and true is returned. Otherwise sp is unmodified and false
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* is returned.
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*/
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bool Func(const std::string& str, Span<const char>& sp);
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/** Extract the expression that sp begins with.
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*
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* This function will return the initial part of sp, up to (but not including) the first
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* comma or closing brace, skipping ones that are surrounded by braces. So for example,
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* for "foo(bar(1),2),3" the initial part "foo(bar(1),2)" will be returned. sp will be
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* updated to skip the initial part that is returned.
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*/
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Span<const char> Expr(Span<const char>& sp);
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/** Split a string on every instance of sep, returning a vector.
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*
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* If sep does not occur in sp, a singleton with the entirety of sp is returned.
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*
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* Note that this function does not care about braces, so splitting
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* "foo(bar(1),2),3) on ',' will return {"foo(bar(1)", "2)", "3)"}.
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*/
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template <typename T = Span<const char>>
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std::vector<T> Split(const Span<const char>& sp, char sep)
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{
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std::vector<T> ret;
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auto it = sp.begin();
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auto start = it;
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while (it != sp.end()) {
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if (*it == sep) {
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ret.emplace_back(start, it);
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start = it + 1;
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}
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++it;
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}
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ret.emplace_back(start, it);
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return ret;
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}
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} // namespace spanparsing
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#endif // BITCOIN_UTIL_SPANPARSING_H
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