line_reader.anubis
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/*
* Created by PyramIDE.
* User: ricard
* Date: 09/09/2008
* Time: 20:32
*
*/
public type LineReader:
line_reader(Data_IO data_io,
Var(String) buffer,
Var(Int) read_pos).
public type ReadResult:
error,
timeout,
ok(String).
public define Maybe(String)
read_line
(
LineReader lr,
Int timeout
) =
if lr is line_reader(data_io, buffer, read_pos) then
if find_string(*buffer, crlf, *read_pos) is
{
failure then
success(end_pos) then
if sub_string(*buffer, *read_pos, end_pos - *read_pos) is
{
failure then failure,
success(line
}
}
//---------------------------------------------------------------------------
read lexical_analysis/fast_lexer_4.anubis
type Token:
line(String),
eol.
public type LineReaderLexer:
line_reader_lexer((LexingStream, One) -> One -> LexerOutput(Token) /*lexer_base*/).
public type LineReader:
line_reader(One -> LexerOutput(Token) /*lexer*/,
One -> Int /*offset*/,
LineReaderLexer /*lexer_base*/,
LexingStream lexing_stream).
public define Int
current_offset
(
LineReader lr,
) =
if lr is line_reader(_, offset, _, _) then offset(unique).
public define Maybe(String)
read_line
(
LineReader lr,
) =
if lr is line_reader(lexer, offset, _, _) then
if lexer(unique) is
{
end_of_input then /* no more token: exit the main loop */
//print("End of input\n");
failure,
error(b, l, c) then
/* should never happen with this lexer (see the above comment) */
print("Lexer error: ["+to_string(b)+"]\n"); failure,
token(t) then
/* a token has been recognized */
if t is
{
line(l) then
//print("tk: line("+l+") @ "+abs_to_decimal(offset(unique))+"\n");
forget(lexer(unique)); // reading EOL
success(l),
eol then
//print("tk: eol\n");
success("")
}
}.
public define Maybe(LineReaderLexer)
make_line_reader_lexer
=
if make_lexer([
lexer_item("#r?#n", return((ByteArray b, LexingTools t, One aux) |-> token(eol))),
lexer_item("#r", return((ByteArray b, LexingTools t, One aux) |-> token(eol))),
lexer_item("[^\r\n]*", return((ByteArray b, LexingTools t, One aux) |-> token(line(to_string(b))))),
],
'#') is
{
error(msg) then print("Syntax error in regular expression: "+to_English(msg)+"\n"); failure,
ok(lexer) then success(line_reader_lexer(lexer))
}.
public define LineReader
make_line_reader
(
LexingStream ls,
LineReaderLexer make_lexer
) =
if make_lexer is line_reader_lexer(lexer) then
line_reader(lexer(ls, unique), (One u) |-> offset(ls), make_lexer, ls).
public define Maybe(LineReader)
make_line_reader
(
LexingStream ls,
) =
if make_line_reader_lexer is
{
failure then failure,
success(lexer) then
/* prepare the input stream */
success(make_line_reader(ls, lexer))
}.
public define Maybe(LineReader)
make_line_reader
(
String s,
) =
make_line_reader(make_lexing_stream("", s)).
public define Maybe(LineReader)
make_line_reader
(
RStream f,
Int timeout
) =
if make_lexing_stream("", /* preambule */
f, /* the opened file */
65536, /* size of buffer for the lexing stream */
timeout) /* timeout (seconds) */
is
{
failure then print("cannot make lexing stream.\n"); failure,
success(ls) then make_line_reader(ls)
}.
public define LineReader
reset_line_reader
(
LineReader lr,
LexingStream ls,
) =
if lr is line_reader(lexer, offset, make_lexer, _) then
make_line_reader(ls, make_lexer).