qse/ase/awk/awk.c

131 lines
2.7 KiB
C

/*
* $Id: awk.c,v 1.12 2006-01-29 18:28:14 bacon Exp $
*/
#include <xp/awk/awk.h>
#ifndef __STAND_ALONE
#include <xp/bas/memory.h>
#include <xp/bas/assert.h>
#endif
xp_awk_t* xp_awk_open (xp_awk_t* awk)
{
if (awk == XP_NULL) {
awk = (xp_awk_t*) xp_malloc (xp_sizeof(awk));
if (awk == XP_NULL) return XP_NULL;
awk->__dynamic = xp_true;
}
else awk->__dynamic = xp_false;
if (xp_str_open(&awk->token.name, 128) == XP_NULL) {
if (awk->__dynamic) xp_free (awk);
return XP_NULL;
}
if (xp_awk_tab_open(&awk->parse.func) == XP_NULL) {
xp_str_close (&awk->token.name);
if (awk->__dynamic) xp_free (awk);
return XP_NULL;
}
awk->opt = 0;
awk->errnum = XP_AWK_ENOERR;
awk->src_func = XP_NULL;
awk->in_func = XP_NULL;
awk->out_func = XP_NULL;
awk->src_arg = XP_NULL;
awk->in_arg = XP_NULL;
awk->out_arg = XP_NULL;
awk->tree.begin = XP_NULL;
awk->tree.end = XP_NULL;
awk->tree.unnamed = XP_NULL;
//awk->tree.funcs = XP_NULL;
awk->lex.curc = XP_CHAR_EOF;
awk->lex.ungotc_count = 0;
return awk;
}
int xp_awk_close (xp_awk_t* awk)
{
xp_awk_clear (awk);
if (xp_awk_detsrc(awk) == -1) return -1;
xp_awk_tab_close(&awk->parse.func);
xp_str_close (&awk->token.name);
if (awk->__dynamic) xp_free (awk);
return 0;
}
// TODO: write a function to clear awk->parse data structure.
// this would be need either as a separate function or as a part of xp_awk_clear...
// do i have to pass an option to xp_awk_clear to do this???
void xp_awk_clear (xp_awk_t* awk)
{
/* clear parse trees */
if (awk->tree.begin != XP_NULL) {
xp_assert (awk->tree.begin->next == XP_NULL);
xp_awk_clrpt (awk->tree.begin);
awk->tree.begin = XP_NULL;
}
if (awk->tree.end != XP_NULL) {
xp_assert (awk->tree.end->next == XP_NULL);
xp_awk_clrpt (awk->tree.end);
awk->tree.end = XP_NULL;
}
while (awk->tree.unnamed != XP_NULL) {
xp_awk_node_t* next = awk->tree.unnamed->next;
xp_awk_clrpt (awk->tree.unnamed);
awk->tree.unnamed = next;
}
/* TODO: destroy pattern-actions pairs */
/* TODO: destroy function list */
}
int xp_awk_attsrc (xp_awk_t* awk, xp_awk_io_t src, void* arg)
{
if (xp_awk_detsrc(awk) == -1) return -1;
xp_assert (awk->src_func == XP_NULL);
if (src(XP_AWK_IO_OPEN, arg, XP_NULL, 0) == -1) {
awk->errnum = XP_AWK_ESRCOP;
return -1;
}
awk->src_func = src;
awk->src_arg = arg;
awk->lex.curc = XP_CHAR_EOF;
awk->lex.ungotc_count = 0;
return 0;
}
int xp_awk_detsrc (xp_awk_t* awk)
{
if (awk->src_func != XP_NULL) {
if (awk->src_func(XP_AWK_IO_CLOSE, awk->src_arg, XP_NULL, 0) == -1) {
awk->errnum = XP_AWK_ESRCCL;
return -1;
}
awk->src_func = XP_NULL;
awk->src_arg = XP_NULL;
awk->lex.curc = XP_CHAR_EOF;
awk->lex.ungotc_count = 0;
}
return 0;
}