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/*
* $Id$
*
* Copyright © 2003 Keith Packard
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation, and that the name of Keith Packard not be used in
* advertising or publicity pertaining to distribution of the software without
* specific, written prior permission. Keith Packard makes no
* representations about the suitability of this software for any purpose. It
* is provided "as is" without express or implied warranty.
*
* KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
autoload RR
autoload Ctype
extend namespace RR {
public namespace Lex {
public exception syntax ();
int lexc (file f) {
try {
return File::getc (f);
} catch File::io_error (string reason, File::error_type error, file f) {
switch (error) {
case File::error_type.UTF8:
printf ("invalid utf\n");
break;
default:
raise File::io_error (reason, error, f);
}
}
return lexc (f);
}
bool skipwhite (file f, bool allow_newline) {
while ((int c = lexc (f)) != -1) {
if (c == '\n' && !allow_newline) {
File::ungetc (c, f);
return true;
}
if (!Ctype::isspace(c)) {
File::ungetc (c, f);
return false;
}
}
return true;
}
public void skipline (file f) {
while ((int c = lexc (f)) != -1)
{
if (c == '\n')
break;
}
}
string next_word (file f) {
string s = "";
bool quoted = false;
bool escaped = false;
while ((int c = lexc (f)) != -1) {
if (!escaped)
{
if (c == '\\')
{
escaped = true;
continue;
}
if (c == '"')
{
quoted = !quoted;
continue;
}
}
if (!quoted && !escaped)
{
if (Ctype::isspace (c))
{
File::ungetc (c, f);
break;
}
}
s = s + String::new(c);
escaped = false;
}
return s;
}
public bool eol (file f) {
skipwhite (f, false);
int c = lexc (f);
if (c == -1)
return true;
File::ungetc (c, f);
if (c == '\n')
return true;
return false;
}
public string word (file f) {
if (skipwhite (f, false)) {
skipline(f);
raise syntax ();
}
return next_word (f);
}
public string firstword (file f) {
skipwhite (f, true);
return next_word (f);
}
public string[] recv(file f) {
string[...] words = {};
try {
void add (string w) {
words[dim(words)] = w;
}
string w = firstword (f);
add (w);
while (!eol (f))
add (word(f));
skipline(f);
}
return words;
}
}
}
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