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//===-- StringExtras.cpp - Implement the StringExtras header --------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements the StringExtras.h header
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/Support/raw_ostream.h"
#include <cctype>
using namespace llvm;
/// getToken - This function extracts one token from source, ignoring any
/// leading characters that appear in the Delimiters string, and ending the
/// token at any of the characters that appear in the Delimiters string. If
/// there are no tokens in the source string, an empty string is returned.
/// The function returns a pair containing the extracted token and the
/// remaining tail string.
std::pair<StringRef, StringRef> llvm::getToken(StringRef Source,
StringRef Delimiters) {
// Figure out where the token starts.
StringRef::size_type Start = Source.find_first_not_of(Delimiters);
// Find the next occurrence of the delimiter.
StringRef::size_type End = Source.find_first_of(Delimiters, Start);
return {Source.slice(Start, End), Source.substr(End)};
}
/// SplitString - Split up the specified string according to the specified
/// delimiters, appending the result fragments to the output list.
void llvm::SplitString(StringRef Source,
SmallVectorImpl<StringRef> &OutFragments,
StringRef Delimiters) {
std::pair<StringRef, StringRef> S = getToken(Source, Delimiters);
while (!S.first.empty()) {
OutFragments.push_back(S.first);
S = getToken(S.second, Delimiters);
}
}
void llvm::printEscapedString(StringRef Name, raw_ostream &Out) {
for (unsigned char C : Name) {
if (C == '\\')
Out << '\\' << C;
else if (isPrint(C) && C != '"')
Out << C;
else
Out << '\\' << hexdigit(C >> 4) << hexdigit(C & 0x0F);
}
}
void llvm::printHTMLEscaped(StringRef String, raw_ostream &Out) {
for (char C : String) {
if (C == '&')
Out << "&";
else if (C == '<')
Out << "<";
else if (C == '>')
Out << ">";
else if (C == '\"')
Out << """;
else if (C == '\'')
Out << "'";
else
Out << C;
}
}
void llvm::printLowerCase(StringRef String, raw_ostream &Out) {
for (const char C : String)
Out << toLower(C);
}
std::string llvm::convertToSnakeFromCamelCase(StringRef input) {
if (input.empty())
return "";
std::string snakeCase;
snakeCase.reserve(input.size());
auto check = [&input](size_t j, function_ref<bool(int)> predicate) {
return j < input.size() && predicate(input[j]);
};
for (size_t i = 0; i < input.size(); ++i) {
snakeCase.push_back(tolower(input[i]));
// Handles "runs" of capitals, such as in OPName -> op_name.
if (check(i, isupper) && check(i + 1, isupper) && check(i + 2, islower))
snakeCase.push_back('_');
if ((check(i, islower) || check(i, isdigit)) && check(i + 1, isupper))
snakeCase.push_back('_');
}
return snakeCase;
}
std::string llvm::convertToCamelFromSnakeCase(StringRef input,
bool capitalizeFirst) {
if (input.empty())
return "";
std::string output;
output.reserve(input.size());
// Push the first character, capatilizing if necessary.
if (capitalizeFirst && std::islower(input.front()))
output.push_back(llvm::toUpper(input.front()));
else
output.push_back(input.front());
// Walk the input converting any `*_[a-z]` snake case into `*[A-Z]` camelCase.
for (size_t pos = 1, e = input.size(); pos < e; ++pos) {
if (input[pos] == '_' && pos != (e - 1) && std::islower(input[pos + 1]))
output.push_back(llvm::toUpper(input[++pos]));
else
output.push_back(input[pos]);
}
return output;
}
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