66 lines
1.9 KiB
C++
66 lines
1.9 KiB
C++
//===--- NumericLiteralInfo.cpp ---------------------------------*- 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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///
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/// \file
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/// This file implements the functionality of getting information about a
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/// numeric literal string, including 0-based positions of the base letter, the
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/// decimal/hexadecimal point, the exponent letter, and the suffix, or npos if
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/// absent.
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///
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//===----------------------------------------------------------------------===//
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#include "NumericLiteralInfo.h"
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#include "llvm/ADT/StringExtras.h"
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namespace clang {
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namespace format {
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using namespace llvm;
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NumericLiteralInfo::NumericLiteralInfo(StringRef Text, char Separator) {
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if (Text.size() < 2)
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return;
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bool IsHex = false;
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if (Text[0] == '0') {
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switch (Text[1]) {
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case 'x':
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case 'X':
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IsHex = true;
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[[fallthrough]];
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case 'b':
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case 'B':
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case 'o': // JavaScript octal.
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case 'O':
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BaseLetterPos = 1; // e.g. 0xF
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break;
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}
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}
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DotPos = Text.find('.', BaseLetterPos + 1); // e.g. 0x.1 or .1
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// e.g. 1.e2 or 0xFp2
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const auto Pos = DotPos != StringRef::npos ? DotPos + 1 : BaseLetterPos + 2;
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ExponentLetterPos =
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// Trim C++ user-defined suffix as in `1_Pa`.
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(Separator == '\'' ? Text.take_front(Text.find('_')) : Text)
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.find_insensitive(IsHex ? 'p' : 'e', Pos);
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const bool HasExponent = ExponentLetterPos != StringRef::npos;
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SuffixPos = Text.find_if_not(
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[&](char C) {
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return (HasExponent || !IsHex ? isDigit : isHexDigit)(C) ||
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C == Separator;
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},
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HasExponent ? ExponentLetterPos + 2 : Pos); // e.g. 1e-2f
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}
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} // namespace format
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} // namespace clang
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