flower/textstream.hh

   1
   2 #ifndef TEXTSTR_HH
   3 #define TEXTSTR_HH
   4
   5 #include <stdio.h>
   6 #include <ctype.h>
   7 #include "string.hh"
   8 #include "varray.hh"
   9
  10 /**
  11   line counting input stream.
  12   a stream for textfiles. linecounting. Thin interface getchar and
  13   ungetchar.  (ungetc is unlimited)
  14
  15   should protect get and unget against improper use
  16 */
  17
  18
  19 class Text_stream
  20 {
  21     int line_no;
  22
  23     // could just have used streams.
  24     FILE *f;
  25     Array<char> pushback;
  26     String name;
  27
  28  public:
  29     Text_stream(String fn);
  30     String get_name() { return name; }
  31     bool eof() {
  32         return feof(f);
  33     }
  34     bool eol() {
  35         return (peek() == '\n');
  36     }
  37     char peek() {
  38         char c = get();
  39         unget(c);
  40         return c;
  41     }
  42     int line(){
  43         return line_no;
  44     }
  45
  46     char    get() {
  47         char c;
  48
  49         if (pushback.empty())
  50             c = getc(f);
  51         else
  52             c = pushback.pop();
  53
  54         if (c =='\n')
  55             line_no++;
  56         return c;
  57     }
  58     void unget(char c) {
  59         if (c =='\n')
  60             line_no--;
  61         pushback.push(c);
  62     }
  63     ~Text_stream (){
  64         if (!eof())
  65             cerr <<__FUNCTION__<< ": closing unended file";
  66
  67         fclose(f);
  68     }
  69
  70     /// GNU format message.
  71     void message(String s);
  72 };
  73
  74 #endif