qse/ase/awk/awk.c

227 lines
5.1 KiB
C

/*
* $Id: awk.c,v 1.19 2006-02-05 16:00:33 bacon Exp $
*/
#include <xp/awk/awk.h>
#ifndef __STAND_ALONE
#include <xp/bas/memory.h>
#include <xp/bas/assert.h>
#endif
static void __free_func (void* func);
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_hash_open(&awk->tree.funcs, 256, __free_func) == XP_NULL) {
xp_str_close (&awk->token.name);
if (awk->__dynamic) xp_free (awk);
return XP_NULL;
}
if (xp_awk_tab_open(&awk->parse.globals) == XP_NULL) {
xp_str_close (&awk->token.name);
xp_awk_hash_close (&awk->tree.funcs);
if (awk->__dynamic) xp_free (awk);
return XP_NULL;
}
if (xp_awk_tab_open(&awk->parse.locals) == XP_NULL) {
xp_str_close (&awk->token.name);
xp_awk_hash_close (&awk->tree.funcs);
xp_awk_tab_close (&awk->parse.globals);
if (awk->__dynamic) xp_free (awk);
return XP_NULL;
}
if (xp_awk_tab_open(&awk->parse.params) == XP_NULL) {
xp_str_close (&awk->token.name);
xp_awk_hash_close (&awk->tree.funcs);
xp_awk_tab_close (&awk->parse.globals);
xp_awk_tab_close (&awk->parse.locals);
if (awk->__dynamic) xp_free (awk);
return XP_NULL;
}
awk->opt.parse = 0;
awk->opt.run = 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->parse.nlocals_max = 0;
awk->tree.nglobals = 0;
awk->tree.begin = XP_NULL;
awk->tree.end = XP_NULL;
awk->tree.unnamed = 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_hash_close (&awk->tree.funcs);
xp_awk_tab_close (&awk->parse.globals);
xp_awk_tab_close (&awk->parse.locals);
xp_awk_tab_close (&awk->parse.params);
xp_str_close (&awk->token.name);
if (awk->__dynamic) xp_free (awk);
return 0;
}
int xp_awk_geterrnum (xp_awk_t* awk)
{
return awk->errnum;
}
const xp_char_t* xp_awk_geterrstr (xp_awk_t* awk)
{
static const xp_char_t* __errstr[] =
{
XP_TEXT("no error"),
XP_TEXT("out of memory"),
XP_TEXT("cannot open source"),
XP_TEXT("cannot close source"),
XP_TEXT("cannot read source"),
XP_TEXT("invalid character"),
XP_TEXT("cannot unget character"),
XP_TEXT("unexpected end of source"),
XP_TEXT("left brace expected"),
XP_TEXT("left parenthesis expected"),
XP_TEXT("right parenthesis expected"),
XP_TEXT("right bracket expected"),
XP_TEXT("comma expected"),
XP_TEXT("semicolon expected"),
XP_TEXT("expression expected"),
XP_TEXT("keyword 'while' expected"),
XP_TEXT("assignment statement expected"),
XP_TEXT("identifier expected"),
XP_TEXT("duplicate BEGIN"),
XP_TEXT("duplicate END"),
XP_TEXT("duplicate function name"),
XP_TEXT("duplicate parameter name"),
XP_TEXT("duplicate variable name"),
XP_TEXT("duplicate name"),
XP_TEXT("undefined identifier")
};
if (awk->errnum >= 0 && awk->errnum < xp_countof(__errstr)) {
return __errstr[awk->errnum];
}
return XP_TEXT("unknown error");
}
// 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)
{
xp_awk_tab_clear (&awk->parse.globals);
xp_awk_tab_clear (&awk->parse.locals);
xp_awk_tab_clear (&awk->parse.params);
awk->parse.nlocals_max = 0;
/* clear parse trees */
awk->tree.nglobals = 0;
xp_awk_hash_clear (&awk->tree.funcs);
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;
}
static void __free_func (void* func)
{
xp_awk_func_t* f = (xp_awk_func_t*) func;
/* f->name doesn't have to be freed */
/*xp_free (f->name);*/
xp_awk_clrpt (f->body);
xp_free (f);
}