/*
 *
  ***** BEGIN LICENSE BLOCK *****
 
  Copyright (C) 2009-2017 Olof Hagsand and Benny Holmgren

  This file is part of CLIXON.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

  Alternatively, the contents of this file may be used under the terms of
  the GNU General Public License Version 3 or later (the "GPL"),
  in which case the provisions of the GPL are applicable instead
  of those above. If you wish to allow use of your version of this file only
  under the terms of the GPL, and not to allow others to
  use your version of this file under the terms of Apache License version 2, 
  indicate your decision by deleting the provisions above and replace them with
  the  notice and other provisions required by the GPL. If you do not delete
  the provisions above, a recipient may use your version of this file under
  the terms of any one of the Apache License version 2 or the GPL.

  ***** END LICENSE BLOCK *****

 * XML parser
 */
%union {
  char *string;
}

%start topxml

%token <string> NAME CHAR 
%token VER ENC
%token BSLASH ESLASH 
%token BTEXT ETEXT
%token BCOMMENT ECOMMENT 


%type <string> val aid

%lex-param     {void *_ya} /* Add this argument to parse() and lex() function */
%parse-param   {void *_ya}

%{

/* typecast macro */
#define _YA ((struct xml_parse_yacc_arg *)_ya)

#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>

/* cligen */
#include <cligen/cligen.h>

/* clicon */
#include "clixon_err.h"
#include "clixon_log.h"
#include "clixon_xml.h"
#include "clixon_xml_parse.h"

void 
clixon_xml_parseerror(void *_ya, char *s) 
{ 
  clicon_err(OE_XML, 0, "xml_parse: line %d: %s: at or before: %s", 
	      _YA->ya_linenum, s, clixon_xml_parsetext); 
  return;
}


static int
xml_attr_new(struct xml_parse_yacc_arg *ya, 
	     cxobj *xn, 
	     char *name, 
	     char *val)
{
    cxobj *xa; 

    if ((xa = xml_new(name, xn)) == NULL)
	return -1;
    xml_type_set(xa, CX_ATTR);
    if (xml_value_set(xa, val) < 0)
	return -1;
    return 0;
}

/* note that we dont handle escaped characters correctly 
   there may also be some leakage here on NULL return
 */
static int
xml_parse_content(struct xml_parse_yacc_arg *ya, 
		  char                      *str)
{
    cxobj *xn = ya->ya_xelement;
    cxobj *xp = ya->ya_xparent;
    int    retval = -1;

    ya->ya_xelement = NULL; /* init */
    if (xn == NULL){
	if ((xn = xml_new("body", xp)) == NULL)
	    goto done; 
	xml_type_set(xn, CX_BODY);
    }
    if (xml_value_append(xn, str)==NULL)
	goto done; 
    ya->ya_xelement = xn;
    retval = 0;
  done:
    return retval;
}

static int
xml_parse_version(struct xml_parse_yacc_arg *ya, char *ver)
{
    if(strcmp(ver, "1.0")){
	clicon_err(OE_XML, errno, "Wrong XML version %s expected 1.0\n", ver);
	free(ver);
	return -1;
    }
    free(ver);
    return 0;
}

static int
xml_parse_id(struct xml_parse_yacc_arg *ya, char *name, char *namespace)
{
    if ((ya->ya_xelement=xml_new(name, ya->ya_xparent)) == NULL) {
	if (namespace)
	    free(namespace);
	free(name);
	return -1;
    }
    xml_namespace_set(ya->ya_xelement, namespace);
    if (namespace)
	free(namespace);
    free(name);
    return 0;
}

static int
xml_parse_endslash_pre(struct xml_parse_yacc_arg *ya)
{
    ya->ya_xparent = ya->ya_xelement;
    ya->ya_xelement = NULL;
    return 0;
}

static int
xml_parse_endslash_mid(struct xml_parse_yacc_arg *ya)
{
    if (ya->ya_xelement != NULL)
	ya->ya_xelement = xml_parent(ya->ya_xelement);
    else
	ya->ya_xelement = ya->ya_xparent;
    ya->ya_xparent = xml_parent(ya->ya_xelement);
    return 0;
}

static int
xml_parse_endslash_post(struct xml_parse_yacc_arg *ya)
{
    ya->ya_xelement = NULL;
    return 0;
}

static int
xml_parse_bslash1(struct xml_parse_yacc_arg *ya, char *name)
{
    int    retval = -1;
    cxobj *x = ya->ya_xelement;
    cxobj *xc;

    if (strcmp(xml_name(x), name)){
	clicon_err(OE_XML, 0, "Sanity check failed: %s vs %s", 
		xml_name(x), name);
	goto done;
    }
    if (xml_namespace(x)!=NULL){
	clicon_err(OE_XML, 0, "Sanity check failed: %s:%s vs %s\n", 
		xml_namespace(x), xml_name(x), name);
	goto done;
    }

    /* remove all non-terminal bodies (strip pretty-print) */
    if (ya->ya_skipspace){
	if (xml_child_nr(x) == 1 && (xml_type(xml_child_i(x, 0))==CX_BODY))
	    ;
	else{
	    xc = NULL;
	    while ((xc = xml_child_each(x, xc, CX_BODY)) != NULL) 
		xml_value_set(xc, ""); /* XXX remove */
	}
    }
    retval = 0;
  done:
    free(name);
    return retval;
}

static int
xml_parse_bslash2(struct xml_parse_yacc_arg *ya, char *namespace, char *name)
{
    int    retval = -1;
    cxobj *x = ya->ya_xelement;
    cxobj *xc;

    if (strcmp(xml_name(x), name)){
	clicon_err(OE_XML, 0, "Sanity check failed: %s:%s vs %s:%s\n", 
		xml_namespace(x), 
		xml_name(x), 
		namespace, 
		name);
	goto done;
    }
    if (xml_namespace(x)==NULL ||
	strcmp(xml_namespace(x), namespace)){
	clicon_err(OE_XML, 0, "Sanity check failed: %s:%s vs %s:%s\n", 
		xml_namespace(x), 
		xml_name(x), 
		namespace, 
		name);
	goto done;
    }
    /* remove all non-terminal bodies (strip pretty-print) */
    if (ya->ya_skipspace){
	if (xml_child_nr(x) == 1 && (xml_type(xml_child_i(x, 0))==CX_BODY))
	    ;
	else{
	    xc = NULL;
	    while ((xc = xml_child_each(x, xc, CX_BODY)) != NULL) 
		xml_value_set(xc, ""); /* XXX remove */
	}
    }
    retval = 0;
  done:
    free(name);
    free(namespace);
    return retval;
}


static char*
xml_parse_ida(struct xml_parse_yacc_arg *ya, char *namespace, char *name)
{
    char *str;
    int len = strlen(namespace)+strlen(name)+2;

    if ((str=malloc(len)) == NULL)
	return NULL;
    snprintf(str, len, "%s:%s", namespace, name);
    free(namespace);
    free(name);
    return str;
}

static int
xml_parse_attr(struct xml_parse_yacc_arg *ya, char *id, char *val)
{
    int retval = -1;

    if (xml_attr_new(ya, ya->ya_xelement, id, val) < 0) 
	goto done;
    retval = 0;
  done:
    free(id); 
    free(val);
    return retval;
}

%} 
 
%%

topxml      : list
                    { clicon_debug(3, "topxml->list ACCEPT"); 
                      YYACCEPT; }
            | dcl list
	            { clicon_debug(3, "topxml->dcl list ACCEPT"); 
                      YYACCEPT; }
            ;

dcl         : BTEXT info encode ETEXT { clicon_debug(3, "dcl->info encode"); }
            ;

info        : VER '=' '\"' CHAR '\"' 
                 { if (xml_parse_version(_YA, $4) <0) YYABORT; }
            | VER '=' '\'' CHAR '\'' 
         	 { if (xml_parse_version(_YA, $4) <0) YYABORT; }
            |
            ;

encode      : ENC '=' '\"' CHAR '\"' {free($4);}
            | ENC '=' '\'' CHAR '\'' {free($4);}
            ;

emnt     : '<' id  attrs emnt1 
                   { clicon_debug(3, "emnt -> < id attrs emnt1"); }
	      ;

id          : NAME            { if (xml_parse_id(_YA, $1, NULL) < 0) YYABORT; 
                                clicon_debug(3, "id -> NAME %s", $1);}
            | NAME ':' NAME   { if (xml_parse_id(_YA, $3, $1) < 0) YYABORT; 
                                clicon_debug(3, "id -> NAME : NAME");}
            ;

emnt1    :  ESLASH          {_YA->ya_xelement = NULL; 
                               clicon_debug(3, "emnt1 -> />");} 
            | '>'              { xml_parse_endslash_pre(_YA); }
              list             { xml_parse_endslash_mid(_YA); }
              etg             { xml_parse_endslash_post(_YA); 
                               clicon_debug(3, "emnt1 -> > list etg");} 
            ;

etg         : BSLASH NAME '>'          
{ 			   clicon_debug(3, "etg -> < </ NAME %s>", $2); if (xml_parse_bslash1(_YA, $2) < 0) YYABORT; }

            | BSLASH NAME ':' NAME '>' 
                       { if (xml_parse_bslash2(_YA, $2, $4) < 0) YYABORT; 
			 clicon_debug(3, "etg -> < </ NAME:NAME >"); }
            ;

list        : list content { clicon_debug(3, "list -> list content"); }
            | content      { clicon_debug(3, "list -> content"); }
            ;

content     : emnt         { clicon_debug(3, "content -> emnt"); }
            | comment      { clicon_debug(3, "content -> comment"); }
            | CHAR         { if (xml_parse_content(_YA, $1) < 0) YYABORT;  
                             clicon_debug(3, "content -> CHAR %s", $1); }
            |              { clicon_debug(3, "content -> "); }
            ;

comment     : BCOMMENT ECOMMENT
            ;


attrs       : attrs att
            |
            ;


aid         : NAME   {$$ = $1;}
            | NAME ':' NAME  
                     { if (($$ = xml_parse_ida(_YA, $1, $3)) == NULL) YYABORT; }
            ;

att         : aid '=' val { if (xml_parse_attr(_YA, $1, $3) < 0) YYABORT; }
            ;

val         : '\"' CHAR '\"'   { $$=$2; /* $2 must be consumed */}
            | '\"'  '\"'       { $$=strdup(""); /* $2 must be consumed */}
            ;

%%