qse/ase/awk/awk.c

/* * $Id: awk.c,v 1.21 2006-02-18 16:14:14 bacon Exp $ */#include <xp/awk/awk.h>#ifndef __STAND_ALONE#include <xp/bas/memory.h>#include <xp/bas/assert.h>#endifstatic 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.chain = XP_NULL;	awk->tree.chain_tail = 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.chain != XP_NULL) {		xp_awk_chain_t* next = awk->tree.chain->next;		if (awk->tree.chain->pattern != XP_NULL)			xp_awk_clrpt (awk->tree.chain->pattern);		if (awk->tree.chain->action != XP_NULL)			xp_awk_clrpt (awk->tree.chain->action);		xp_free (awk->tree.chain);		awk->tree.chain = next;	}	awk->tree.chain_tail = XP_NULL;	/* 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);}