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46 lines
1.4 KiB
C++
46 lines
1.4 KiB
C++
//===--- QuotedString.cpp - Printing a string as a quoted string ----------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2016 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/raw_ostream.h"
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#include "swift/Basic/QuotedString.h"
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using namespace swift;
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void swift::printAsQuotedString(llvm::raw_ostream &out, llvm::StringRef text) {
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out << '"';
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for (auto C : text) {
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switch (C) {
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case '\\': out << "\\\\"; break;
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case '\t': out << "\\t"; break;
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case '\n': out << "\\n"; break;
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case '\r': out << "\\r"; break;
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case '"': out << "\\\""; break;
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case '\'': out << '\''; break; // no need to escape these
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case '\0': out << "\\0"; break;
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default:
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auto c = (unsigned char)C;
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// Other ASCII control characters should get escaped.
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if (c < 0x20 || c == 0x7F) {
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static const char hexdigit[] = {
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'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
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'A', 'B', 'C', 'D', 'E', 'F'
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};
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out << "\\u{" << hexdigit[c >> 4] << hexdigit[c & 0xF] << '}';
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} else {
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out << c;
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}
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break;
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}
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}
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out << '"';
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}
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