lib/source-file.cc

   1 /*
   2   source-file.cc -- implement Source_file
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--1999 Jan Nieuwenhuizen <janneke@gnu.org>
   7   & Han-Wen Nienhuys <hanwen@cs.uu.nl>
   8 */
   9
  10
  11 #include <assert.h>
  12 #include <strstream.h>
  13
  14 #include "string.hh"
  15 #include "proto.hh"
  16 #include "warn.hh"
  17 #include "thank-you-cygnus.hh"
  18 #include "source-file.hh"
  19 #include "simple-file-storage.hh"
  20 #include "string-storage.hh"
  21
  22 Source_file::Source_file (String filename_str)
  23 {
  24   name_str_ = filename_str;
  25   istream_p_ = 0;
  26   storage_p_ = new Simple_file_storage (filename_str);
  27   pos_ch_C_ = ch_C ();
  28 }
  29
  30 Source_file::Source_file (String name_str, String data_str)
  31 {
  32   name_str_ = name_str;
  33   istream_p_ = 0;
  34   storage_p_ = new String_storage (data_str);
  35   pos_ch_C_ = ch_C ();
  36 }
  37
  38 istream*
  39 Source_file::istream_l ()
  40 {
  41   /*
  42     if (!name_str_.length_i ())
  43       return &cin;
  44     */
  45
  46   if (!istream_p_)
  47     {
  48       if (length_i ()) // can-t this be done without such a hack?
  49         istream_p_ = new istrstream (ch_C (), length_i ());
  50       else
  51         {
  52           istream_p_ = new istrstream ("", 0);
  53           istream_p_->set (ios::eofbit);
  54         }
  55     }
  56   return istream_p_;
  57 }
  58
  59 String
  60 Source_file::file_line_column_str (char const *context_ch_C) const
  61 {
  62   if  (!ch_C ())
  63     return "(" + _ ("position unknown") + ")";
  64   else
  65     return name_str () + ":" + to_str (line_i (context_ch_C))
  66       + ":" + to_str (char_i (context_ch_C));
  67 }
  68
  69 String
  70 Source_file::name_str () const
  71 {
  72   return name_str_;
  73 }
  74
  75 Source_file::~Source_file ()
  76 {
  77   delete istream_p_;
  78   istream_p_ = 0;
  79   delete storage_p_;
  80 }
  81
  82 Slice
  83 Source_file::line_slice (char const* pos_ch_C) const
  84 {
  85   if (!in_b (pos_ch_C))
  86     return Slice (0,0);
  87
  88   char const* data_ch_C = ch_C ();
  89   char const * eof_C_ = data_ch_C + length_i ();
  90
  91   if (pos_ch_C == eof_C_)
  92     pos_ch_C --;
  93   char const* begin_ch_C = pos_ch_C;
  94   while (begin_ch_C > data_ch_C)
  95     if (*--begin_ch_C == '\n')
  96       {
  97         begin_ch_C++;
  98         break;
  99       }
 100
 101   char const* end_ch_C = pos_ch_C;
 102   while (end_ch_C < eof_C_)
 103     if (*end_ch_C++ == '\n')
 104       {
 105         end_ch_C--;
 106         break;
 107       }
 108
 109   return Slice (begin_ch_C - data_ch_C, end_ch_C - data_ch_C);
 110 }
 111
 112 String
 113 Source_file::line_str (char const* pos_ch_C) const
 114 {
 115   if (!in_b (pos_ch_C))
 116     return "";
 117
 118   Slice line = line_slice (pos_ch_C);
 119   char const* data_ch_C = ch_C ();
 120   return String ((Byte const*)data_ch_C + line[LEFT], line.length ());
 121 }
 122
 123 int
 124 Source_file::char_i (char const* pos_ch_C) const
 125 {
 126   if (!in_b (pos_ch_C))
 127     return 0;
 128
 129   char const* data_ch_C = ch_C ();
 130   return pos_ch_C - (line_slice (pos_ch_C)[SMALLER] + data_ch_C);
 131 }
 132
 133 int
 134 Source_file::column_i (char const* pos_ch_C) const
 135 {
 136   if (!in_b (pos_ch_C))
 137     return 0;
 138
 139   int ch_i = char_i (pos_ch_C);
 140   String line = line_str (pos_ch_C);
 141
 142   int col_i = 0;
 143   for (int i = 0; i < ch_i; i++)
 144     if (line[i] == '\t')
 145       col_i = (col_i / 8 + 1) * 8;
 146     else
 147       col_i++;
 148
 149   return col_i;
 150 }
 151
 152 String
 153 Source_file::error_str (char const* pos_ch_C) const
 154 {
 155   if (!in_b (pos_ch_C))
 156     return "(" + _ ("position unknown") + ")";
 157
 158   int ch_i = char_i (pos_ch_C);
 159   String line = line_str (pos_ch_C);
 160   String context = line.left_str (ch_i)
 161     + to_str ('\n')
 162     + to_str (' ', column_i (pos_ch_C))
 163     + line.cut_str (ch_i, INT_MAX);
 164
 165   return context;
 166 }
 167
 168 bool
 169 Source_file::in_b (char const* pos_ch_C) const
 170 {
 171   return (pos_ch_C && (pos_ch_C >= ch_C ()) && (pos_ch_C <= ch_C () + length_i ()));
 172 }
 173
 174 int
 175 Source_file::line_i (char const* pos_ch_C) const
 176 {
 177   if (!in_b (pos_ch_C))
 178     return 0;
 179
 180   int i = 1;
 181   char const* scan_ch_C = ch_C ();
 182   if (!scan_ch_C)
 183     return 0;
 184
 185   while (scan_ch_C < pos_ch_C)
 186     if (*scan_ch_C++ == '\n')
 187       i++;
 188   return i;
 189 }
 190
 191 int
 192 Source_file::length_i () const
 193 {
 194   return storage_p_->length_i ();
 195 }
 196
 197 char const *
 198 Source_file::ch_C () const
 199 {
 200   return storage_p_->ch_C ();
 201 }
 202
 203 void
 204 Source_file::set_pos (char const * pos_ch_C)
 205 {
 206   if (in_b (pos_ch_C))
 207     pos_ch_C_ = pos_ch_C;
 208   else
 209     error (error_str (pos_ch_C) + "invalid pos");
 210 }
 211
 212 char const*
 213 Source_file::seek_ch_C (int n)
 214 {
 215   char const* new_ch_C = ch_C () + n;
 216   if (n < 0)
 217     new_ch_C += length_i ();
 218   if (in_b (new_ch_C))
 219     pos_ch_C_ = new_ch_C;
 220   else
 221     error (error_str (new_ch_C) + "seek past eof");
 222
 223   return pos_ch_C_;
 224 }
 225
 226 char const*
 227 Source_file::forward_ch_C (int n)
 228 {
 229   char const* old_pos_C = pos_ch_C_;
 230   char const* new_ch_C = pos_ch_C_ + n;
 231   if (in_b (new_ch_C))
 232     pos_ch_C_ = new_ch_C;
 233   else
 234     error (error_str (new_ch_C)  + "forward past eof");
 235
 236   return old_pos_C;
 237 }
 238
 239 String
 240 Source_file::get_str (int n)
 241 {
 242   String str ((Byte const*)forward_ch_C (n), n);
 243   return str;
 244 }