Home | History | Annotate | Download | only in Support 
      1 //===-- Twine.cpp - Fast Temporary String Concatenation -------------------===//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is distributed under the University of Illinois Open Source
      6 // License. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 
     10 #include "llvm/ADT/Twine.h"
     11 #include "llvm/ADT/SmallString.h"
     12 #include "llvm/Support/Debug.h"
     13 #include "llvm/Support/raw_ostream.h"
     14 using namespace llvm;
     15 
     16 std::string Twine::str() const {
     17   // If we're storing only a std::string, just return it.
     18   if (LHSKind == StdStringKind && RHSKind == EmptyKind)
     19     return *LHS.stdString;
     20 
     21   // Otherwise, flatten and copy the contents first.
     22   SmallString<256> Vec;
     23   return toStringRef(Vec).str();
     24 }
     25 
     26 void Twine::toVector(SmallVectorImpl<char> &Out) const {
     27   raw_svector_ostream OS(Out);
     28   print(OS);
     29 }
     30 
     31 StringRef Twine::toNullTerminatedStringRef(SmallVectorImpl<char> &Out) const {
     32   if (isUnary()) {
     33     switch (getLHSKind()) {
     34     case CStringKind:
     35       // Already null terminated, yay!
     36       return StringRef(LHS.cString);
     37     case StdStringKind: {
     38       const std::string *str = LHS.stdString;
     39       return StringRef(str->c_str(), str->size());
     40     }
     41     default:
     42       break;
     43     }
     44   }
     45   toVector(Out);
     46   Out.push_back(0);
     47   Out.pop_back();
     48   return StringRef(Out.data(), Out.size());
     49 }
     50 
     51 void Twine::printOneChild(raw_ostream &OS, Child Ptr,
     52                           NodeKind Kind) const {
     53   switch (Kind) {
     54   case Twine::NullKind: break;
     55   case Twine::EmptyKind: break;
     56   case Twine::TwineKind:
     57     Ptr.twine->print(OS);
     58     break;
     59   case Twine::CStringKind:
     60     OS << Ptr.cString;
     61     break;
     62   case Twine::StdStringKind:
     63     OS << *Ptr.stdString;
     64     break;
     65   case Twine::StringRefKind:
     66     OS << *Ptr.stringRef;
     67     break;
     68   case Twine::SmallStringKind:
     69     OS << *Ptr.smallString;
     70     break;
     71   case Twine::CharKind:
     72     OS << Ptr.character;
     73     break;
     74   case Twine::DecUIKind:
     75     OS << Ptr.decUI;
     76     break;
     77   case Twine::DecIKind:
     78     OS << Ptr.decI;
     79     break;
     80   case Twine::DecULKind:
     81     OS << *Ptr.decUL;
     82     break;
     83   case Twine::DecLKind:
     84     OS << *Ptr.decL;
     85     break;
     86   case Twine::DecULLKind:
     87     OS << *Ptr.decULL;
     88     break;
     89   case Twine::DecLLKind:
     90     OS << *Ptr.decLL;
     91     break;
     92   case Twine::UHexKind:
     93     OS.write_hex(*Ptr.uHex);
     94     break;
     95   }
     96 }
     97 
     98 void Twine::printOneChildRepr(raw_ostream &OS, Child Ptr,
     99                               NodeKind Kind) const {
    100   switch (Kind) {
    101   case Twine::NullKind:
    102     OS << "null"; break;
    103   case Twine::EmptyKind:
    104     OS << "empty"; break;
    105   case Twine::TwineKind:
    106     OS << "rope:";
    107     Ptr.twine->printRepr(OS);
    108     break;
    109   case Twine::CStringKind:
    110     OS << "cstring:\""
    111        << Ptr.cString << "\"";
    112     break;
    113   case Twine::StdStringKind:
    114     OS << "std::string:\""
    115        << Ptr.stdString << "\"";
    116     break;
    117   case Twine::StringRefKind:
    118     OS << "stringref:\""
    119        << Ptr.stringRef << "\"";
    120     break;
    121   case Twine::SmallStringKind:
    122     OS << "smallstring:\"" << *Ptr.smallString << "\"";
    123     break;
    124   case Twine::CharKind:
    125     OS << "char:\"" << Ptr.character << "\"";
    126     break;
    127   case Twine::DecUIKind:
    128     OS << "decUI:\"" << Ptr.decUI << "\"";
    129     break;
    130   case Twine::DecIKind:
    131     OS << "decI:\"" << Ptr.decI << "\"";
    132     break;
    133   case Twine::DecULKind:
    134     OS << "decUL:\"" << *Ptr.decUL << "\"";
    135     break;
    136   case Twine::DecLKind:
    137     OS << "decL:\"" << *Ptr.decL << "\"";
    138     break;
    139   case Twine::DecULLKind:
    140     OS << "decULL:\"" << *Ptr.decULL << "\"";
    141     break;
    142   case Twine::DecLLKind:
    143     OS << "decLL:\"" << *Ptr.decLL << "\"";
    144     break;
    145   case Twine::UHexKind:
    146     OS << "uhex:\"" << Ptr.uHex << "\"";
    147     break;
    148   }
    149 }
    150 
    151 void Twine::print(raw_ostream &OS) const {
    152   printOneChild(OS, LHS, getLHSKind());
    153   printOneChild(OS, RHS, getRHSKind());
    154 }
    155 
    156 void Twine::printRepr(raw_ostream &OS) const {
    157   OS << "(Twine ";
    158   printOneChildRepr(OS, LHS, getLHSKind());
    159   OS << " ";
    160   printOneChildRepr(OS, RHS, getRHSKind());
    161   OS << ")";
    162 }
    163 
    164 void Twine::dump() const {
    165   print(dbgs());
    166 }
    167 
    168 void Twine::dumpRepr() const {
    169   printRepr(dbgs());
    170 }
    171