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109 lines
3.8 KiB
C++
109 lines
3.8 KiB
C++
//===-- StringExtras.cpp - Implement the StringExtras header --------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the StringExtras.h header
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/StringExtras.h"
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using namespace llvm;
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/// getToken - This function extracts one token from source, ignoring any
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/// leading characters that appear in the Delimiters string, and ending the
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/// token at any of the characters that appear in the Delimiters string. If
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/// there are no tokens in the source string, an empty string is returned.
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/// The Source source string is updated in place to remove the returned string
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/// and any delimiter prefix from it.
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std::string llvm::getToken(std::string &Source, const char *Delimiters) {
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unsigned NumDelimiters = std::strlen(Delimiters);
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// Figure out where the token starts.
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std::string::size_type Start =
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Source.find_first_not_of(Delimiters, 0, NumDelimiters);
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if (Start == std::string::npos) Start = Source.size();
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// Find the next occurance of the delimiter.
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std::string::size_type End =
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Source.find_first_of(Delimiters, Start, NumDelimiters);
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if (End == std::string::npos) End = Source.size();
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// Create the return token.
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std::string Result = std::string(Source.begin()+Start, Source.begin()+End);
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// Erase the token that we read in.
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Source.erase(Source.begin(), Source.begin()+End);
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return Result;
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}
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/// SplitString - Split up the specified string according to the specified
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/// delimiters, appending the result fragments to the output list.
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void llvm::SplitString(const std::string &Source,
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std::vector<std::string> &OutFragments,
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const char *Delimiters) {
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std::string S = Source;
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std::string S2 = getToken(S, Delimiters);
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while (!S2.empty()) {
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OutFragments.push_back(S2);
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S2 = getToken(S, Delimiters);
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}
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}
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/// UnescapeString - Modify the argument string, turning two character sequences
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/// like '\\' 'n' into '\n'. This handles: \e \a \b \f \n \r \t \v \' \\ and
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/// \num (where num is a 1-3 byte octal value).
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void llvm::UnescapeString(std::string &Str) {
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for (unsigned i = 0; i != Str.size(); ++i) {
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if (Str[i] == '\\' && i != Str.size()-1) {
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switch (Str[i+1]) {
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default: continue; // Don't execute the code after the switch.
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case 'a': Str[i] = '\a'; break;
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case 'b': Str[i] = '\b'; break;
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case 'e': Str[i] = 27; break;
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case 'f': Str[i] = '\f'; break;
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case 'n': Str[i] = '\n'; break;
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case 'r': Str[i] = '\r'; break;
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case 't': Str[i] = '\t'; break;
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case 'v': Str[i] = '\v'; break;
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case '\'': Str[i] = '\''; break;
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case '\\': Str[i] = '\\'; break;
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}
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// Nuke the second character.
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Str.erase(Str.begin()+i+1);
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}
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}
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}
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/// EscapeString - Modify the argument string, turning '\\' and anything that
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/// doesn't satisfy std::isprint into an escape sequence.
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void llvm::EscapeString(std::string &Str) {
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for (unsigned i = 0; i != Str.size(); ++i) {
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if (Str[i] == '\\') {
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++i;
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Str.insert(Str.begin()+i, '\\');
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} else if (Str[i] == '\t') {
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Str[i++] = '\\';
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Str.insert(Str.begin()+i, 't');
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} else if (Str[i] == '\n') {
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Str[i++] = '\\';
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Str.insert(Str.begin()+i, 'n');
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} else if (!std::isprint(Str[i])) {
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// Always expand to a 3-digit octal escape.
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unsigned Char = Str[i];
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Str[i++] = '\\';
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Str.insert(Str.begin()+i++, '0'+((Char/64) & 7));
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Str.insert(Str.begin()+i++, '0'+((Char/8) & 7));
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Str.insert(Str.begin()+i , '0'+( Char & 7));
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}
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}
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}
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