/*
 * $Id$ 
 *
    Copyright (c) 2006-2019 Chung, Hyung-Hwan. All rights reserved.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:
    1. Redistributions of source code must retain the above copyright
       notice, this list of conditions and the following disclaimer.
    2. Redistributions in binary form must reproduce the above copyright
       notice, this list of conditions and the following disclaimer in the
       documentation and/or other materials provided with the distribution.

    THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
    OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
    IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
    NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
    THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "awk-prv.h"
#include <qse/cmn/mbwc.h>

static void free_fun (qse_htb_t* map, void* vptr, qse_size_t vlen)
{
	qse_awk_t* awk = *(qse_awk_t**)QSE_XTN(map);
	qse_awk_fun_t* f = (qse_awk_fun_t*)vptr;

	/* f->name doesn't have to be freed */
	/*qse_awk_freemem (awk, f->name);*/

	if (f->argspec) qse_awk_freemem (awk, f->argspec);
	qse_awk_clrpt (awk, f->body);
	qse_awk_freemem (awk, f);
}

static void free_fnc (qse_htb_t* map, void* vptr, qse_size_t vlen)
{
	qse_awk_t* awk = *(qse_awk_t**)QSE_XTN(map);
	qse_awk_fnc_t* f = (qse_awk_fnc_t*)vptr;
	qse_awk_freemem (awk, f);
}

static int init_token (qse_mmgr_t* mmgr, qse_awk_tok_t* tok)
{
	tok->name = qse_str_open (mmgr, 0, 128);
	if (tok->name == QSE_NULL) return -1;
	
	tok->type = 0;
	tok->loc.file = QSE_NULL;
	tok->loc.line = 0;
	tok->loc.colm = 0;

	return 0;
}

static void fini_token (qse_awk_tok_t* tok)
{
	if (tok->name)
	{
		qse_str_close (tok->name);
		tok->name = QSE_NULL;
	}
}

static void clear_token (qse_awk_tok_t* tok)
{
	if (tok->name) qse_str_clear (tok->name);
	tok->type = 0;
	tok->loc.file = QSE_NULL;
	tok->loc.line = 0;
	tok->loc.colm = 0;
}

qse_awk_t* qse_awk_open (qse_mmgr_t* mmgr, qse_size_t xtnsize, const qse_awk_prm_t* prm, qse_awk_errnum_t* errnum)
{
	qse_awk_t* awk;

	awk = (qse_awk_t*)QSE_MMGR_ALLOC(mmgr, QSE_SIZEOF(qse_awk_t) + xtnsize);
	if (awk)
	{
		int xret;

		xret = qse_awk_init(awk, mmgr, prm);
		if (xret <= -1)
		{
			if (errnum) *errnum = qse_awk_geterrnum(awk);
			QSE_MMGR_FREE (mmgr, awk);
			awk = QSE_NULL;
		}
		else QSE_MEMSET (QSE_XTN(awk), 0, xtnsize);
	}
	else if (errnum) *errnum = QSE_AWK_ENOMEM;

	return awk;
}

void qse_awk_close (qse_awk_t* awk)
{
	qse_awk_fini (awk);
	QSE_MMGR_FREE (awk->_mmgr, awk);
}

int qse_awk_init (qse_awk_t* awk, qse_mmgr_t* mmgr, const qse_awk_prm_t* prm)
{
	static qse_htb_style_t treefuncbs =
	{
		{
			QSE_HTB_COPIER_INLINE,
			QSE_HTB_COPIER_DEFAULT 
		},
		{
			QSE_HTB_FREEER_DEFAULT,
			free_fun
		},
		QSE_HTB_COMPER_DEFAULT,
		QSE_HTB_KEEPER_DEFAULT,
		QSE_HTB_SIZER_DEFAULT,
		QSE_HTB_HASHER_DEFAULT
	};

	static qse_htb_style_t fncusercbs =
	{
		{
			QSE_HTB_COPIER_INLINE,
			QSE_HTB_COPIER_DEFAULT 
		},
		{
			QSE_HTB_FREEER_DEFAULT,
			free_fnc
		},
		QSE_HTB_COMPER_DEFAULT,
		QSE_HTB_KEEPER_DEFAULT,
		QSE_HTB_SIZER_DEFAULT,
		QSE_HTB_HASHER_DEFAULT
	};

	/* zero out the object */
	QSE_MEMSET (awk, 0, QSE_SIZEOF(*awk));

	/* remember the memory manager */
	awk->_instsize = QSE_SIZEOF(*awk);
	awk->_mmgr = mmgr;
	awk->_cmgr = qse_getdflcmgr();

	/* initialize error handling fields */
	awk->errinf.num = QSE_AWK_ENOERR;
	awk->errinf.loc.line = 0;
	awk->errinf.loc.colm = 0;
	awk->errinf.loc.file = QSE_NULL;
	awk->errstr = qse_awk_dflerrstr;
	awk->haltall = 0;

	/* progagate the primitive functions */
	QSE_ASSERT (prm             != QSE_NULL);
	QSE_ASSERT (prm->math.pow   != QSE_NULL);
	QSE_ASSERT (prm->math.mod   != QSE_NULL);
	if (prm           == QSE_NULL || 
	    prm->math.pow == QSE_NULL ||
	    prm->math.mod == QSE_NULL)
	{
		qse_awk_seterrnum (awk, QSE_AWK_EINVAL, QSE_NULL);
		goto oops;
	}
	awk->prm = *prm;

	if (init_token(mmgr, &awk->ptok) <= -1 ||
	    init_token(mmgr, &awk->tok) <= -1 ||
	    init_token(mmgr, &awk->ntok) <= -1) 
	{
		qse_awk_seterrnum (awk, QSE_AWK_ENOMEM, QSE_NULL);
		goto oops;
	}

	awk->opt.trait = QSE_AWK_MODERN;
#if defined(__OS2__) || defined(_WIN32) || defined(__DOS__)
	awk->opt.trait |= QSE_AWK_CRLF;
#endif
	awk->opt.rtx_stack_limit = QSE_AWK_DFL_RTX_STACK_LIMIT;

	awk->tree.ngbls = 0;
	awk->tree.ngbls_base = 0;
	awk->tree.begin = QSE_NULL;
	awk->tree.begin_tail = QSE_NULL;
	awk->tree.end = QSE_NULL;
	awk->tree.end_tail = QSE_NULL;
	awk->tree.chain = QSE_NULL;
	awk->tree.chain_tail = QSE_NULL;
	awk->tree.chain_size = 0;

	/* TODO: initial map size?? */
	awk->tree.funs = qse_htb_open (mmgr, QSE_SIZEOF(awk), 512, 70, QSE_SIZEOF(qse_char_t), 1);
	awk->parse.funs = qse_htb_open (mmgr, QSE_SIZEOF(awk), 256, 70, QSE_SIZEOF(qse_char_t), 1);
	awk->parse.named = qse_htb_open (mmgr, QSE_SIZEOF(awk), 256, 70, QSE_SIZEOF(qse_char_t), 1);

	awk->parse.gbls = qse_arr_open (mmgr, QSE_SIZEOF(awk), 128);
	awk->parse.lcls = qse_arr_open (mmgr, QSE_SIZEOF(awk), 64);
	awk->parse.params = qse_arr_open (mmgr, QSE_SIZEOF(awk), 32);

	awk->fnc.sys = QSE_NULL;
	awk->fnc.user = qse_htb_open (mmgr, QSE_SIZEOF(awk), 512, 70, QSE_SIZEOF(qse_char_t), 1);
	awk->modtab = qse_rbt_open (mmgr, 0, QSE_SIZEOF(qse_char_t), 1);

	if (awk->tree.funs == QSE_NULL ||
	    awk->parse.funs == QSE_NULL ||
	    awk->parse.named == QSE_NULL ||
	    awk->parse.gbls == QSE_NULL ||
	    awk->parse.lcls == QSE_NULL ||
	    awk->parse.params == QSE_NULL ||
	    awk->fnc.user == QSE_NULL ||
	    awk->modtab == QSE_NULL) 
	{
		qse_awk_seterrnum (awk, QSE_AWK_ENOMEM, QSE_NULL);
		goto oops;
	}

	*(qse_awk_t**)QSE_XTN(awk->tree.funs) = awk;
	qse_htb_setstyle (awk->tree.funs, &treefuncbs);

	*(qse_awk_t**)QSE_XTN(awk->parse.funs) = awk;
	qse_htb_setstyle (awk->parse.funs, qse_gethtbstyle(QSE_HTB_STYLE_INLINE_KEY_COPIER));

	*(qse_awk_t**)QSE_XTN(awk->parse.named) = awk;
	qse_htb_setstyle (awk->parse.named, qse_gethtbstyle(QSE_HTB_STYLE_INLINE_KEY_COPIER));

	*(qse_awk_t**)QSE_XTN(awk->parse.gbls) = awk;
	qse_arr_setscale (awk->parse.gbls, QSE_SIZEOF(qse_char_t));
	qse_arr_setcopier (awk->parse.gbls, QSE_ARR_COPIER_INLINE);

	*(qse_awk_t**)QSE_XTN(awk->parse.lcls) = awk;
	qse_arr_setscale (awk->parse.lcls, QSE_SIZEOF(qse_char_t));
	qse_arr_setcopier (awk->parse.lcls, QSE_ARR_COPIER_INLINE);

	*(qse_awk_t**)QSE_XTN(awk->parse.params) = awk;
	qse_arr_setscale (awk->parse.params, QSE_SIZEOF(qse_char_t));
	qse_arr_setcopier (awk->parse.params, QSE_ARR_COPIER_INLINE);

	*(qse_awk_t**)QSE_XTN(awk->fnc.user) = awk;
	qse_htb_setstyle (awk->fnc.user, &fncusercbs);

	qse_rbt_setstyle (awk->modtab, qse_getrbtstyle(QSE_RBT_STYLE_INLINE_COPIERS));

	if (qse_awk_initgbls (awk) <= -1) 
	{
		qse_awk_seterrnum (awk, QSE_AWK_ENOMEM, QSE_NULL);
		goto oops;
	}

	return 0;

oops:
	if (awk->modtab) qse_rbt_close (awk->modtab);
	if (awk->fnc.user) qse_htb_close (awk->fnc.user);
	if (awk->parse.params) qse_arr_close (awk->parse.params);
	if (awk->parse.lcls) qse_arr_close (awk->parse.lcls);
	if (awk->parse.gbls) qse_arr_close (awk->parse.gbls);
	if (awk->parse.named) qse_htb_close (awk->parse.named);
	if (awk->parse.funs) qse_htb_close (awk->parse.funs);
	if (awk->tree.funs) qse_htb_close (awk->tree.funs);
	fini_token (&awk->ntok);
	fini_token (&awk->tok);
	fini_token (&awk->ptok);

	return -1;
}

void qse_awk_fini (qse_awk_t* awk)
{
	qse_awk_ecb_t* ecb;
	int i;

	qse_awk_clear (awk);
	/*qse_awk_clrfnc (awk);*/

	for (ecb = awk->ecb; ecb; ecb = ecb->next)
		if (ecb->close) ecb->close (awk);

	qse_rbt_close (awk->modtab);
	qse_htb_close (awk->fnc.user);

	qse_arr_close (awk->parse.params);
	qse_arr_close (awk->parse.lcls);
	qse_arr_close (awk->parse.gbls);
	qse_htb_close (awk->parse.named);
	qse_htb_close (awk->parse.funs);

	qse_htb_close (awk->tree.funs);

	fini_token (&awk->ntok);
	fini_token (&awk->tok);
	fini_token (&awk->ptok);

	if (awk->parse.incl_hist.ptr) qse_awk_freemem (awk, awk->parse.incl_hist.ptr);
	qse_awk_clearsionames (awk);

	/* destroy dynamically allocated options */
	for (i = 0; i < QSE_COUNTOF(awk->opt.mod); i++)
	{
		if (awk->opt.mod[i].ptr) qse_awk_freemem (awk, awk->opt.mod[i].ptr);
	}
}

static qse_rbt_walk_t unload_module (qse_rbt_t* rbt, qse_rbt_pair_t* pair, void* ctx)
{
	qse_awk_t* awk = (qse_awk_t*)ctx;
	qse_awk_mod_data_t* md;

	md = QSE_RBT_VPTR(pair);	
	if (md->mod.unload) md->mod.unload (&md->mod, awk);
	if (md->handle) awk->prm.modclose (awk, md->handle);

	return QSE_RBT_WALK_FORWARD;
}

void qse_awk_clear (qse_awk_t* awk)
{
	qse_awk_ecb_t* ecb;

	for (ecb = awk->ecb; ecb; ecb = ecb->next)
	{
		if (ecb->clear) ecb->clear (awk);
	}

	awk->haltall = 0;

	clear_token (&awk->tok);
	clear_token (&awk->ntok);
	clear_token (&awk->ptok);

	/* clear all loaded modules */
	qse_rbt_walk (awk->modtab, unload_module, awk);
	qse_rbt_clear (awk->modtab);

	QSE_ASSERT (QSE_ARR_SIZE(awk->parse.gbls) == awk->tree.ngbls);
	/* delete all non-builtin global variables */
	qse_arr_delete (
		awk->parse.gbls, awk->tree.ngbls_base, 
		QSE_ARR_SIZE(awk->parse.gbls) - awk->tree.ngbls_base);

	qse_arr_clear (awk->parse.lcls);
	qse_arr_clear (awk->parse.params);
	qse_htb_clear (awk->parse.named);
	qse_htb_clear (awk->parse.funs);

	awk->parse.nlcls_max = 0; 
	awk->parse.depth.block = 0;
	awk->parse.depth.loop = 0;
	awk->parse.depth.expr = 0;
	awk->parse.depth.incl = 0;
	awk->parse.pragma.trait = (awk->opt.trait & QSE_AWK_IMPLICIT); 
	awk->parse.pragma.rtx_stack_limit = 0;

	awk->parse.incl_hist.count =0;

	/* clear parse trees */
	/*awk->tree.ngbls_base = 0;
	awk->tree.ngbls = 0; */
	awk->tree.ngbls = awk->tree.ngbls_base;

	awk->tree.cur_fun.ptr = QSE_NULL;
	awk->tree.cur_fun.len = 0;
	qse_htb_clear (awk->tree.funs);

	if (awk->tree.begin) 
	{
		/*QSE_ASSERT (awk->tree.begin->next == QSE_NULL);*/
		qse_awk_clrpt (awk, awk->tree.begin);
		awk->tree.begin = QSE_NULL;
		awk->tree.begin_tail = QSE_NULL;
	}

	if (awk->tree.end) 
	{
		/*QSE_ASSERT (awk->tree.end->next == QSE_NULL);*/
		qse_awk_clrpt (awk, awk->tree.end);
		awk->tree.end = QSE_NULL;
		awk->tree.end_tail = QSE_NULL;
	}

	while (awk->tree.chain) 
	{
		qse_awk_chain_t* next = awk->tree.chain->next;

		if (awk->tree.chain->pattern != QSE_NULL)
			qse_awk_clrpt (awk, awk->tree.chain->pattern);
		if (awk->tree.chain->action != QSE_NULL)
			qse_awk_clrpt (awk, awk->tree.chain->action);
		qse_awk_freemem (awk, awk->tree.chain);
		awk->tree.chain = next;
	}

	awk->tree.chain_tail = QSE_NULL;
	awk->tree.chain_size = 0;

	/* this table must not be cleared here as there can be a reference
	 * to an entry of this table from errinf.loc.file when qse_awk_parse() 
	 * failed. this table is cleared in qse_awk_parse().
	 * qse_awk_claersionames (awk);
	 */
}

void qse_awk_getprm (qse_awk_t* awk, qse_awk_prm_t* prm)
{
	*prm = awk->prm;
}

void qse_awk_setprm (qse_awk_t* awk, const qse_awk_prm_t* prm)
{
	awk->prm = *prm;
}

static int dup_str_opt (qse_awk_t* awk, const void* value, qse_cstr_t* tmp)
{
	if (value)
	{
		tmp->ptr = qse_strdup(value, qse_awk_getmmgr(awk));
		if (!tmp->ptr)
		{
			qse_awk_seterrnum (awk, QSE_AWK_ENOMEM, QSE_NULL);
			return -1;
		}
		tmp->len = qse_strlen(tmp->ptr);
	}
	else
	{
		tmp->ptr = QSE_NULL;
		tmp->len = 0;
	}

	return 0;
}

int qse_awk_setopt (qse_awk_t* awk, qse_awk_opt_t id, const void* value)
{
	switch (id)
	{
		case QSE_AWK_TRAIT:
			awk->opt.trait = *(const int*)value;
			return 0;

		case QSE_AWK_MODPREFIX:
		case QSE_AWK_MODPOSTFIX:
		{
			qse_cstr_t tmp;
			int idx;

			if (dup_str_opt (awk, value, &tmp) <= -1) return -1;

			idx = id - QSE_AWK_MODPREFIX;
			if (awk->opt.mod[idx].ptr) qse_awk_freemem (awk, awk->opt.mod[idx].ptr);

			awk->opt.mod[idx] = tmp;
			return 0;
		}

		case QSE_AWK_INCLUDEDIRS:
		{
			qse_cstr_t tmp;
			if (dup_str_opt (awk, value, &tmp) <= -1) return -1;
			if (awk->opt.incldirs.ptr) qse_awk_freemem (awk, awk->opt.incldirs.ptr);
			awk->opt.incldirs = tmp;
			return 0;
		}

		case QSE_AWK_DEPTH_INCLUDE:
		case QSE_AWK_DEPTH_BLOCK_PARSE:
		case QSE_AWK_DEPTH_BLOCK_RUN:
		case QSE_AWK_DEPTH_EXPR_PARSE:
		case QSE_AWK_DEPTH_EXPR_RUN:
		case QSE_AWK_DEPTH_REX_BUILD:
		case QSE_AWK_DEPTH_REX_MATCH:
			awk->opt.depth.a[id - QSE_AWK_DEPTH_INCLUDE] = *(const qse_size_t*)value;
			return 0;

		case QSE_AWK_RTX_STACK_LIMIT:
			awk->opt.rtx_stack_limit = *(const qse_size_t*)value;
			if (awk->opt.rtx_stack_limit < QSE_AWK_MIN_RTX_STACK_LIMIT) awk->opt.rtx_stack_limit = QSE_AWK_MIN_RTX_STACK_LIMIT;
			else if (awk->opt.rtx_stack_limit > QSE_AWK_MAX_RTX_STACK_LIMIT) awk->opt.rtx_stack_limit = QSE_AWK_MAX_RTX_STACK_LIMIT;
			return 0;
	}

	qse_awk_seterrnum (awk, QSE_AWK_EINVAL, QSE_NULL);
	return -1;
}

int qse_awk_getopt (qse_awk_t* awk, qse_awk_opt_t id, void* value)
{
	switch  (id)
	{
		case QSE_AWK_TRAIT:
			*(int*)value = awk->opt.trait;
			return 0;

		case QSE_AWK_MODPREFIX:
		case QSE_AWK_MODPOSTFIX:
			*(const qse_char_t**)value = awk->opt.mod[id - QSE_AWK_MODPREFIX].ptr;
			return 0;

		case QSE_AWK_INCLUDEDIRS:
			*(const qse_char_t**)value = awk->opt.incldirs.ptr;
			return 0;

		case QSE_AWK_DEPTH_INCLUDE:
		case QSE_AWK_DEPTH_BLOCK_PARSE:
		case QSE_AWK_DEPTH_BLOCK_RUN:
		case QSE_AWK_DEPTH_EXPR_PARSE:
		case QSE_AWK_DEPTH_EXPR_RUN:
		case QSE_AWK_DEPTH_REX_BUILD:
		case QSE_AWK_DEPTH_REX_MATCH:
			*(qse_size_t*)value = awk->opt.depth.a[id - QSE_AWK_DEPTH_INCLUDE];
			return 0;

		case QSE_AWK_RTX_STACK_LIMIT:
			*(qse_size_t*)value = awk->opt.rtx_stack_limit;
			return 0;
	};

	qse_awk_seterrnum (awk, QSE_AWK_EINVAL, QSE_NULL);
	return -1;
}

void qse_awk_haltall (qse_awk_t* awk)
{
	awk->haltall = 1;
	qse_awk_seterrnum (awk, QSE_AWK_EINVAL, QSE_NULL);
}

qse_awk_ecb_t* qse_awk_popecb (qse_awk_t* awk)
{
	qse_awk_ecb_t* top = awk->ecb;
	if (top) awk->ecb = top->next;
	return top;
}

void qse_awk_pushecb (qse_awk_t* awk, qse_awk_ecb_t* ecb)
{
	ecb->next = awk->ecb;
	awk->ecb = ecb;
}