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 Jan Nieuwenhuizen <jan@digicash.com>
   7   & Han-Wen Nienhuys <hanwen@stack.nl>
   8 */
   9
  10
  11 #include <assert.h>
  12 #include <strstream.h>
  13
  14 #include "string.hh"
  15 #include "proto.hh"
  16 #include "plist.hh"
  17 #include "warn.hh"
  18 #include "windhoos-suck-suck-suck-thank-you-cygnus.hh"
  19 #include "source-file.hh"
  20 #include "simple-file-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 }
  28
  29 istream*
  30 Source_file::istream_l ()
  31 {
  32   /*
  33     if (!name_str_.length_i ())
  34       return &cin;
  35     */
  36
  37   if (!istream_p_)
  38     {
  39       if (length_i ()) // can-t this be done without such a hack?
  40         istream_p_ = new istrstream (ch_C (), length_i ());
  41       else
  42         {
  43           istream_p_ = new istrstream ("", 0);
  44           istream_p_->set (ios::eofbit);
  45         }
  46     }
  47   return istream_p_;
  48 }
  49
  50 String
  51 Source_file::file_line_no_str (char const *context_ch_C) const
  52 {
  53   if  (!ch_C ())
  54     return _ ("(unknown)");
  55   else
  56     return name_str () + ": "
  57       + String (line_i (context_ch_C));
  58 }
  59
  60 String
  61 Source_file::name_str () const
  62 {
  63   return name_str_;
  64 }
  65
  66 Source_file::~Source_file ()
  67 {
  68   delete istream_p_;
  69   istream_p_ = 0;
  70   delete storage_p_;
  71 }
  72
  73 String
  74 Source_file::error_str (char const* pos_ch_C) const
  75 {
  76   char const* data_ch_C = ch_C ();
  77   char const * eof_C_ = data_ch_C + length_i ();
  78   if (!in_b (pos_ch_C))
  79     return _ ("(position unknown)");
  80
  81
  82   if (pos_ch_C == eof_C_)
  83     pos_ch_C --;
  84   char const* begin_ch_C = pos_ch_C;
  85   while (begin_ch_C > data_ch_C)
  86     if (*--begin_ch_C == '\n')
  87       {
  88         begin_ch_C++;
  89         break;
  90       }
  91
  92   char const* end_ch_C = pos_ch_C;
  93   while (end_ch_C < eof_C_)
  94     if (*end_ch_C++ == '\n')
  95       {
  96         end_ch_C--;
  97         break;
  98       }
  99
 100   //    String (char const* p, int length) is missing!?
 101   String line_str ((Byte const*)begin_ch_C, end_ch_C - begin_ch_C);
 102
 103   int error_col_i = 0;
 104   char const* scan_ch_C = begin_ch_C;
 105   while (scan_ch_C < pos_ch_C)
 106     if (*scan_ch_C++ == '\t')
 107       error_col_i = (error_col_i / 8 + 1) * 8;
 108     else
 109       error_col_i++;
 110
 111   String str = line_str.left_str (pos_ch_C - begin_ch_C)
 112     + String ('\n')
 113     + String (' ', error_col_i)
 114     + line_str.cut (pos_ch_C - begin_ch_C, INT_MAX); // String::mid should take 0 arg..
 115   return str;
 116 }
 117
 118 bool
 119 Source_file::in_b (char const* pos_ch_C) const
 120 {
 121   return (pos_ch_C && (pos_ch_C >= ch_C ()) && (pos_ch_C <= ch_C () + length_i ()));
 122 }
 123
 124
 125 int
 126 Source_file::line_i (char const* pos_ch_C) const
 127 {
 128   if (!in_b (pos_ch_C))
 129     return 0;
 130
 131   int i = 1;
 132   char const* scan_ch_C = ch_C ();
 133   if (!scan_ch_C)
 134     return 0;
 135
 136   while (scan_ch_C < pos_ch_C)
 137     if (*scan_ch_C++ == '\n')
 138       i++;
 139   return i;
 140 }
 141
 142 int
 143 Source_file::length_i () const
 144 {
 145   return storage_p_->length_i ();
 146 }
 147
 148 char const *
 149 Source_file::ch_C () const
 150 {
 151   return storage_p_->ch_C ();
 152 }