1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144
|
/*
* $Id$
*
* 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;
}
}
}
|