ext/scintilla/lexlib/PropSetSimple.cxx

   1 // SciTE - Scintilla based Text Editor
   2 /** @file PropSetSimple.cxx
   3  ** A Java style properties file module.
   4  **/
   5 // Copyright 1998-2010 by Neil Hodgson <neilh@scintilla.org>
   6 // The License.txt file describes the conditions under which this software may be distributed.
   7
   8 // Maintain a dictionary of properties
   9
  10 #include <stdlib.h>
  11 #include <string.h>
  12 #include <stdio.h>
  13
  14 #ifdef _MSC_VER
  15 // Visual C++ doesn't like unreachable code in its own headers.
  16 #pragma warning(disable: 4018 4100 4245 4511 4512 4663 4702)
  17 #endif
  18
  19 #include <string>
  20 #include <map>
  21
  22 #include "PropSetSimple.h"
  23
  24 #ifdef SCI_NAMESPACE
  25 using namespace Scintilla;
  26 #endif
  27
  28 typedef std::map<std::string, std::string> mapss;
  29
  30 PropSetSimple::PropSetSimple() {
  31         mapss *props = new mapss;
  32         impl = static_cast<void *>(props);
  33 }
  34
  35 PropSetSimple::~PropSetSimple() {
  36         mapss *props = static_cast<mapss *>(impl);
  37         delete props;
  38         impl = 0;
  39 }
  40
  41 void PropSetSimple::Set(const char *key, const char *val, int lenKey, int lenVal) {
  42         mapss *props = static_cast<mapss *>(impl);
  43         if (!*key)      // Empty keys are not supported
  44                 return;
  45         if (lenKey == -1)
  46                 lenKey = static_cast<int>(strlen(key));
  47         if (lenVal == -1)
  48                 lenVal = static_cast<int>(strlen(val));
  49         (*props)[std::string(key, lenKey)] = std::string(val, lenVal);
  50 }
  51
  52 static bool IsASpaceCharacter(unsigned int ch) {
  53     return (ch == ' ') || ((ch >= 0x09) && (ch <= 0x0d));
  54 }
  55
  56 void PropSetSimple::Set(const char *keyVal) {
  57         while (IsASpaceCharacter(*keyVal))
  58                 keyVal++;
  59         const char *endVal = keyVal;
  60         while (*endVal && (*endVal != '\n'))
  61                 endVal++;
  62         const char *eqAt = strchr(keyVal, '=');
  63         if (eqAt) {
  64                 Set(keyVal, eqAt + 1, static_cast<int>(eqAt-keyVal),
  65                         static_cast<int>(endVal - eqAt - 1));
  66         } else if (*keyVal) {   // No '=' so assume '=1'
  67                 Set(keyVal, "1", static_cast<int>(endVal-keyVal), 1);
  68         }
  69 }
  70
  71 void PropSetSimple::SetMultiple(const char *s) {
  72         const char *eol = strchr(s, '\n');
  73         while (eol) {
  74                 Set(s);
  75                 s = eol + 1;
  76                 eol = strchr(s, '\n');
  77         }
  78         Set(s);
  79 }
  80
  81 const char *PropSetSimple::Get(const char *key) const {
  82         mapss *props = static_cast<mapss *>(impl);
  83         mapss::const_iterator keyPos = props->find(std::string(key));
  84         if (keyPos != props->end()) {
  85                 return keyPos->second.c_str();
  86         } else {
  87                 return "";
  88         }
  89 }
  90
  91 // There is some inconsistency between GetExpanded("foo") and Expand("$(foo)").
  92 // A solution is to keep a stack of variables that have been expanded, so that
  93 // recursive expansions can be skipped.  For now I'll just use the C++ stack
  94 // for that, through a recursive function and a simple chain of pointers.
  95
  96 struct VarChain {
  97         VarChain(const char *var_=NULL, const VarChain *link_=NULL): var(var_), link(link_) {}
  98
  99         bool contains(const char *testVar) const {
 100                 return (var && (0 == strcmp(var, testVar)))
 101                         || (link && link->contains(testVar));
 102         }
 103
 104         const char *var;
 105         const VarChain *link;
 106 };
 107
 108 static int ExpandAllInPlace(const PropSetSimple &props, std::string &withVars, int maxExpands, const VarChain &blankVars) {
 109         size_t varStart = withVars.find("$(");
 110         while ((varStart != std::string::npos) && (maxExpands > 0)) {
 111                 size_t varEnd = withVars.find(")", varStart+2);
 112                 if (varEnd == std::string::npos) {
 113                         break;
 114                 }
 115
 116                 // For consistency, when we see '$(ab$(cde))', expand the inner variable first,
 117                 // regardless whether there is actually a degenerate variable named 'ab$(cde'.
 118                 size_t innerVarStart = withVars.find("$(", varStart+2);
 119                 while ((innerVarStart != std::string::npos) && (innerVarStart > varStart) && (innerVarStart < varEnd)) {
 120                         varStart = innerVarStart;
 121                         innerVarStart = withVars.find("$(", varStart+2);
 122                 }
 123
 124                 std::string var(withVars.c_str(), varStart + 2, varEnd - varStart - 2);
 125                 std::string val = props.Get(var.c_str());
 126
 127                 if (blankVars.contains(var.c_str())) {
 128                         val = ""; // treat blankVar as an empty string (e.g. to block self-reference)
 129                 }
 130
 131                 if (--maxExpands >= 0) {
 132                         maxExpands = ExpandAllInPlace(props, val, maxExpands, VarChain(var.c_str(), &blankVars));
 133                 }
 134
 135                 withVars.erase(varStart, varEnd-varStart+1);
 136                 withVars.insert(varStart, val.c_str(), val.length());
 137
 138                 varStart = withVars.find("$(");
 139         }
 140
 141         return maxExpands;
 142 }
 143
 144 char *PropSetSimple::Expanded(const char *key) const {
 145         std::string val = Get(key);
 146         ExpandAllInPlace(*this, val, 100, VarChain(key));
 147         char *ret = new char [val.size() + 1];
 148         strcpy(ret, val.c_str());
 149         return ret;
 150 }
 151
 152 int PropSetSimple::GetExpanded(const char *key, char *result) const {
 153         char *val = Expanded(key);
 154         const int n = static_cast<int>(strlen(val));
 155         if (result) {
 156                 strcpy(result, val);
 157         }
 158         delete []val;
 159         return n;       // Not including NUL
 160 }
 161
 162 int PropSetSimple::GetInt(const char *key, int defaultValue) const {
 163         char *val = Expanded(key);
 164         if (val) {
 165                 int retVal = val[0] ? atoi(val) : defaultValue;
 166                 delete []val;
 167                 return retVal;
 168         }
 169         return defaultValue;
 170 }