| //===--- QuotedString.cpp - Printing a string as a quoted string ----------===// |
| // |
| // This source file is part of the Swift.org open source project |
| // |
| // Copyright (c) 2014 - 2016 Apple Inc. and the Swift project authors |
| // Licensed under Apache License v2.0 with Runtime Library Exception |
| // |
| // See http://swift.org/LICENSE.txt for license information |
| // See http://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 << c; |
| } |
| break; |
| } |
| } |
| out << '"'; |
| } |