d3cdf0f222
Move common functions shared by TableGen Option Emitter and Options library to Support: - Move `StrCmpOptionName` and base it on the existing version in OptTable.cpp, with an additional mode to control fall back to case insensitive comparison. - Add `StrCmpOptionPrefixes` to compare prefixes and use zip() to iterate through lists of prefixes. - Rename `CompareOptionRecords` to less ambiguous name `IsOptionRecordLess`. - Merge 2 back-to-back ifs with same condition in `IsOptionRecordLess`. Fixes https://github.com/llvm/llvm-project/issues/107723
44 lines
1.8 KiB
C++
44 lines
1.8 KiB
C++
//===- OptionStrCmp.cpp - Option String Comparison --------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/OptionStrCmp.h"
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#include "llvm/ADT/STLExtras.h"
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using namespace llvm;
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// Comparison function for Option strings (option names & prefixes).
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// The ordering is *almost* case-insensitive lexicographic, with an exception.
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// '\0' comes at the end of the alphabet instead of the beginning (thus options
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// precede any other options which prefix them). Additionally, if two options
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// are identical ignoring case, they are ordered according to case sensitive
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// ordering if `FallbackCaseSensitive` is true.
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int llvm::StrCmpOptionName(StringRef A, StringRef B,
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bool FallbackCaseSensitive) {
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size_t MinSize = std::min(A.size(), B.size());
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if (int Res = A.substr(0, MinSize).compare_insensitive(B.substr(0, MinSize)))
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return Res;
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// If they are identical ignoring case, use case sensitive ordering.
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if (A.size() == B.size())
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return FallbackCaseSensitive ? A.compare(B) : 0;
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return (A.size() == MinSize) ? 1 /* A is a prefix of B. */
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: -1 /* B is a prefix of A */;
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}
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// Comparison function for Option prefixes.
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int llvm::StrCmpOptionPrefixes(ArrayRef<StringRef> APrefixes,
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ArrayRef<StringRef> BPrefixes) {
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for (const auto &[APre, BPre] : zip(APrefixes, BPrefixes)) {
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if (int Cmp = StrCmpOptionName(APre, BPre))
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return Cmp;
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}
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// Both prefixes are identical.
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return 0;
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}
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