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python-lex.l
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python-lex.l
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/*
* Copyright (c) 2001-2002 Secure Software, Inc
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*/
%{
#include <string.h>
#include "tokens.h"
#include "engine.h"
int plexreal_column = 0;
int plex_column = 0;
int plex_lineno = 1;
int pyyclength = 0;
int pyycsize = 0;
char *yypcomment = NULL;
static void gobble_string(char c);
static int identifier(void);
static void no_match(void);
static int longstring(int);
static void count(void);
#define YY_INPUT(buf, result, max_size) \
if (((result = fread(buf, 1, max_size, yyin)) == 0) && ferror(yyin)) { \
YY_FATAL_ERROR("input in flex scanner failed"); \
} else { \
if (result) { \
char *c, *end = (buf) + result - 1; \
for (c = (buf); c < end; c++) { \
if (*c == '\r') *c = ' '; \
if (*c == '\\' && *(c + 1) == '\n') { \
memmove(c + 1, c + 2, end - c); \
result--; \
end--; \
*c = '\r'; \
} \
} \
if (*end == '\r') *end = ' '; \
if (*end == '\\') { \
result--; \
fseek(yyin, -1, SEEK_CUR); \
} \
} \
}
%}
%%
[\n\r] { count();plex_lineno++; return TOKEN_NEWLINE; }
[ \t\v\f] { count(); }
^[ \r\t]*"#".*\n { count();plex_lineno++; }
"#".* { count(); }
and {count(); return TOKEN_AND; }
assert {count(); return TOKEN_ASSERT; }
break {count(); return TOKEN_BREAK; }
class {count(); return TOKEN_CLASS; }
continue {count(); return TOKEN_CONTINUE; }
def {count(); return TOKEN_DEF; }
del {count(); return TOKEN_DEL; }
elif {count(); return TOKEN_ELIF; }
else {count(); return TOKEN_ELSE; }
except {count(); return TOKEN_EXCEPT; }
exec {count(); return TOKEN_EXEC; }
finally {count(); return TOKEN_FINALLY; }
for {count(); return TOKEN_FOR; }
from {count(); return TOKEN_FROM; }
global {count(); return TOKEN_GLOBAL; }
if {count(); return TOKEN_IF; }
import {count(); return TOKEN_IMPORT; }
in {count(); return TOKEN_IN; }
is {count(); return TOKEN_IS; }
lambda {count(); return TOKEN_LAMBDA; }
not {count(); return TOKEN_NOT; }
or {count(); return TOKEN_OR; }
pass {count(); return TOKEN_PASS; }
print {count(); return TOKEN_PRINT; }
raise {count(); return TOKEN_RAISE; }
return {count(); return TOKEN_RETURN; }
try {count(); return TOKEN_TRY; }
while {count(); return TOKEN_WHILE; }
("\'") { count();gobble_string('\''); return TOKEN_SSTRING_LITERAL; }
("\"") { count();gobble_string('"'); return TOKEN_SSTRING_LITERAL; }
\"\"\" {count();return longstring('\"');}
\'\'\' {count();return longstring('\'');}
0[xX][a-fA-F0-9]+(l|L)* {count(); return TOKEN_HEX_CONST; }
0[0-9]+(l|L)* {count(); return TOKEN_OCT_CONST; }
[0-9]+(l|L)* {count(); return TOKEN_DEC_CONST; }
[0-9]+[Ee][+-]?[0-9]+ {count(); return TOKEN_FLOAT_CONST; }
[0-9]*"."[0-9]+([Ee][+-]?[0-9]+)? {count(); return TOKEN_FLOAT_CONST; }
[0-9]+"."[0-9]*([Ee][+-]?[0-9]+)? {count(); return TOKEN_FLOAT_CONST; }
[1-9][0-9]*(j|J) {count(); return TOKEN_IMAG_CONST; }
[0-9]+[Ee][+-]?[0-9]+(j|J) {count(); return TOKEN_IMAG_CONST; }
[0-9]*"."[0-9]+([Ee][+-]?[0-9]+)?(j|J) {count(); return TOKEN_IMAG_CONST; }
[0-9]+"."[0-9]*([Ee][+-]?[0-9]+)?(j|J) {count(); return TOKEN_IMAG_CONST; }
[a-zA-Z_]([a-zA-Z_]|[0-9]|\$|[\r])* {count(); return identifier(); }
">>=" {count(); return TOKEN_RIGHT_ASSIGN; }
"<<=" {count(); return TOKEN_LEFT_ASSIGN; }
"**=" {count(); return TOKEN_EXP_ASSIGN; }
"+=" {count(); return TOKEN_ADD_ASSIGN; }
"-=" {count(); return TOKEN_SUB_ASSIGN; }
"*=" {count(); return TOKEN_MUL_ASSIGN; }
"/=" {count(); return TOKEN_DIV_ASSIGN; }
"%=" {count(); return TOKEN_MOD_ASSIGN; }
"&=" {count(); return TOKEN_AND_ASSIGN; }
"|=" {count(); return TOKEN_OR_ASSIGN; }
"^=" {count(); return TOKEN_XOR_ASSIGN; }
">>" {count(); return TOKEN_RIGHT_OP; }
"<<" {count(); return TOKEN_LEFT_OP; }
"**" {count(); return TOKEN_EXP_OP; }
"<=" {count(); return TOKEN_LE_OP; }
">=" {count(); return TOKEN_GE_OP; }
"==" {count(); return TOKEN_EQ_OP; }
"!=" {count(); return TOKEN_NE_OP; }
"<>" {count(); return TOKEN_NE_OP; }
"&" {count(); return '&'; }
"~" {count(); return '~'; }
"-" {count(); return '-'; }
"+" {count(); return '+'; }
"*" {count(); return '*'; }
"/" {count(); return '/'; }
"%" {count(); return '%'; }
"<" {count(); return '<'; }
">" {count(); return '>'; }
"^" {count(); return '^'; }
"|" {count(); return '|'; }
"(" {count(); return '('; }
")" {count(); return ')'; }
"[" {count(); return '['; }
"]" {count(); return ']'; }
"{" {count(); return '{'; }
"}" {count(); return '}'; }
"," {count(); return ','; }
":" {count(); return ':'; }
"." {count(); return '.'; }
"`" {count(); return '`'; }
"=" {count(); return '='; }
";" {count(); return ';'; }
. { count();no_match(); }
%%
int yywrap(void)
{
return 1;
}
static void
count()
{
int i;
if (plexreal_column != 0)
{
plex_column = plexreal_column+1;
}
for (i = 0; yytext[i] != '\0'; i++)
{
if (yytext[i] == '\n')
{
plexreal_column = 0;
plex_column = 0;
} else if (yytext[i] == '\t') {
plexreal_column += 8 - (plexreal_column % 8);
}else {
plexreal_column++;
}
}
}
static
void gobble_string(char which)
{
int bslash = 0;
char c;
while ((c = input()) && c != -1)
{
plexreal_column++;
switch(c) {
case '\\':
if (!bslash)
bslash = 1;
else
bslash = 0;
break;
case '\n':
plexreal_column = 0;
plex_column = 0;
plex_lineno++;
bslash = 0;
break;
default:
if (c == which && !bslash) {
return;
}
bslash = 0;
break;
}
}
}
static
void no_match(void)
{
fprintf(stderr, "%s:%d: warning: bad token `%s'\n", current_file, plex_lineno, yytext);
}
static
int identifier(void)
{
char * c;
while ((c = strchr(yytext, '\r')) != (char *)NULL)
{
memmove(c, c + 1, strlen(c));
plex_column = 0;
plexreal_column = 0;
plex_lineno++;
}
return TOKEN_IDENTIFIER;
}
static
int longstring(int q)
{
char c;
int quotes = 0;
int backtick = 0;
while ((c = input()) && c != -1)
{
plexreal_column++ ;
if (c != q)
quotes = 0;
if (c == '\\') {
backtick = 1;
continue;
}
if (c == q)
{
if (backtick)
{
quotes = 0;
backtick = 0;
} else {
quotes++;
}
}
backtick = 0;
if (quotes == 3)
{
return TOKEN_LSTRING_LITERAL;
}
if (c == '\n' || c == '\r')
{
plexreal_column = 0;
plex_column = 0;
plex_lineno++;
}
}
return TOKEN_LSTRING_LITERAL;
}