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|
/* definitions */
%x sComment
%x sID
%x sValue
%x sQStr
%option noyywrap
ID ([-[:alnum:]_]+)
SPACE ([[:space:]]{-}[\n])
%{
/* get rid of compiler warning */
#define YY_NO_INPUT 1
#include <string.h>
#include "cparse_def.h"
#include "cparse.h"
#define STR_BUF_INC 4096
static int node_deactivated = 0;
static char *str_buf = NULL;
static char *out_buf = NULL;
static char *str_ptr = NULL;
static size_t str_buf_len = 0;
static void
prepare_buffers(size_t add_len)
{
size_t slen = str_ptr - str_buf;
if (str_buf && (slen + add_len) < str_buf_len) {
// nothing to do
return;
}
str_buf_len += STR_BUF_INC;
str_buf = realloc(str_buf, str_buf_len);
out_buf = realloc(out_buf, str_buf_len);
if (!str_buf || !out_buf) {
printf("realloc failed\n");
exit(1);
}
str_ptr = str_buf + slen;
}
static void
append_str(char *text)
{
size_t tlen = strlen(text);
prepare_buffers(tlen);
strcpy(str_ptr, text);
str_ptr += tlen;
}
static void
set_ret_str()
{
prepare_buffers(0);
*str_ptr = 0;
strcpy(out_buf, str_buf);
str_ptr = str_buf;
}
static void
free_str()
{
free(str_buf);
free(out_buf);
node_deactivated = 0;
str_buf = NULL;
out_buf = NULL;
str_ptr = NULL;
str_buf_len = 0;
}
%}
%%
<INITIAL>"/*" {
BEGIN(sComment);
}
<sComment>[^*\n]* {
append_str(cparse_text);
}
<sComment>\*[^/] {
append_str(cparse_text);
}
<sComment>\n {
append_str(cparse_text);
++cparse_lineno;
}
<sComment>"*/" {
char *tmp;
size_t tlen;
set_ret_str();
/* need to strip out leading or trailing space */
tmp = out_buf;
tlen = strlen(tmp);
if (tlen > 0 && tmp[tlen - 1] == ' ') {
tmp[tlen - 1] = 0;
--tlen;
}
if (tlen > 0 && tmp[0] == ' ') {
++tmp;
}
cparse_lval.str = strdup(tmp);
free_str();
BEGIN(INITIAL);
return COMMENT;
}
"//".* { /* Do nothing. */
}
<INITIAL>! {
node_deactivated = 1;
}
<INITIAL>{SPACE}+ {
}
<INITIAL>\n {
++cparse_lineno;
}
<INITIAL>\} {
node_deactivated = 0;
return RIGHTB;
}
<INITIAL>{ID} {
cparse_lval.str = strdup(cparse_text);
cparse_lval.deactivated = node_deactivated;
node_deactivated = 0;
BEGIN(sID);
return NODE;
}
<sID>:?{SPACE}+[^{\n] {
unput(cparse_text[cparse_leng - 1]);
BEGIN(sValue);
}
<sID>{SPACE}+ {
}
<sID>\{ {
BEGIN(INITIAL);
return LEFTB;
}
<sID>\n {
++cparse_lineno;
BEGIN(INITIAL);
}
<sValue>{SPACE}+ {
/* ignore spaces */
}
<sValue>\" {
/* quoted string */
BEGIN(sQStr);
}
<sQStr>[^\"\\\n]+ {
append_str(cparse_text);
}
<sQStr>\\\"\n {
append_str("\\");
set_ret_str();
cparse_lval.str = strdup(out_buf);
free_str();
++cparse_lineno;
BEGIN(INITIAL);
return VALUE;
}
<sQStr>\\. {
/* this will consume the \" sequence */
append_str(cparse_text);
}
<sQStr>\n {
append_str(cparse_text);
++cparse_lineno;
}
<sQStr>\" {
set_ret_str();
cparse_lval.str = strdup(out_buf);
free_str();
BEGIN(sValue);
return VALUE;
}
<sValue>[^{"[:space:]][^{[:space:]]* {
/* unquoted string */
cparse_lval.str = strdup(cparse_text);
return VALUE;
}
<sValue>\{ {
BEGIN(INITIAL);
return LEFTB;
}
<sValue>\n {
++cparse_lineno;
BEGIN(INITIAL);
}
<*>. {
return SYNTAX_ERROR;
}
%%
/* code */
|
