2 includable-lexer.cc -- implement Includable_lexer
4 source file of the LilyPond music typesetter
6 (c) 1997 Han-Wen Nienhuys <hanwen@stack.nl>
8 #include "includable-lexer.hh"
9 #include "source-file.hh"
13 #define YY_BUF_SIZE 16384
16 Includable_lexer::Includable_lexer ()
18 yy_current_buffer = 0;
21 /** set the new input to s, remember old file.
24 Includable_lexer::new_input (String s, Sources * global_sources)
26 Source_file * sl = global_sources->get_file_l (s);
29 String msg =_ ("Can't find file `") + s+ "'";
30 LexerError (msg.ch_C ());
35 char_count_stack_.push (0);
36 if (yy_current_buffer)
37 state_stack_.push (yy_current_buffer);
38 cout << "[" << s<<flush;
39 include_stack_.push (sl);
42 ugh. We'd want to create a buffer from the bytes directly.
44 Whoops. The size argument to yy_create_buffer is not the
45 filelength but a BUFFERSIZE. Maybe this is why reading stdin fucks up.
48 yy_switch_to_buffer (yy_create_buffer (sl->istream_l (), YY_BUF_SIZE));
51 /** pop the inputstack. conceptually this is a destructor, but it
52 does not destruct the Source_file that Includable_lexer::new_input creates. */
54 Includable_lexer::close_input ()
56 include_stack_.pop ();
57 char_count_stack_.pop ();
59 yy_delete_buffer (yy_current_buffer);
60 yy_current_buffer = 0;
61 if (state_stack_.empty ())
67 yy_switch_to_buffer (state_stack_.pop ());
73 Includable_lexer::here_ch_C ()
75 if (include_stack_.empty ())
77 return include_stack_.top ()->ch_C () + char_count_stack_.top ();
80 Includable_lexer::~Includable_lexer ()
82 while (!include_stack_.empty ())
88 Since we don't create the buffer state from the bytes directly, we
89 don't know about the location of the lexer. Add this as a
92 Includable_lexer::add_lexed_char (int count)
94 char_count_stack_.top () += count;
98 Includable_lexer::source_file_l () const
100 if (include_stack_.empty ())
103 return include_stack_.top ();