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//===--- QuotedString.cpp - Printing a string as a quoted string ----------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
#include "llvm/Support/raw_ostream.h"
#include "swift/Basic/QuotedString.h"
using namespace swift;
void swift::printAsQuotedString(llvm::raw_ostream &out, llvm::StringRef text) {
out << '"';
for (auto C : text) {
switch (C) {
case '\\': out << "\\\\"; break;
case '\t': out << "\\t"; break;
case '\n': out << "\\n"; break;
case '\r': out << "\\r"; break;
case '"': out << "\\\""; break;
case '\'': out << '\''; break; // no need to escape these
case '\0': out << "\\0"; break;
default:
auto c = (unsigned char)C;
// Other ASCII control characters should get escaped.
if (c < 0x20 || c == 0x7F) {
static const char hexdigit[] = {
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'A', 'B', 'C', 'D', 'E', 'F'
};
out << "\\u{" << hexdigit[c >> 4] << hexdigit[c & 0xF] << '}';
} else {
out << (char)c;
}
break;
}
}
out << '"';
}
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