289 lines
11 KiB
Text
289 lines
11 KiB
Text
/*
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*
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***** BEGIN LICENSE BLOCK *****
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Copyright (C) 2009-2018 Olof Hagsand and Benny Holmgren
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This file is part of CLIXON.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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Alternatively, the contents of this file may be used under the terms of
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the GNU General Public License Version 3 or later (the "GPL"),
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in which case the provisions of the GPL are applicable instead
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of those above. If you wish to allow use of your version of this file only
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under the terms of the GPL, and not to allow others to
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use your version of this file under the terms of Apache License version 2,
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indicate your decision by deleting the provisions above and replace them with
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the notice and other provisions required by the GPL. If you do not delete
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the provisions above, a recipient may use your version of this file under
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the terms of any one of the Apache License version 2 or the GPL.
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***** END LICENSE BLOCK *****
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* XPATH Parser
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* From https://www.w3.org/TR/xpath-10/
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* The primary syntactic construct in XPath is the expression.
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* An expression matches the production Expr
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* see https://www.w3.org/TR/xpath-10/#NT-Expr)
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* Lexical structure is defined by ExprToken, see
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* see https://www.w3.org/TR/xpath-10/#exprlex
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*/
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%start start
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%union {
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int intval;
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double dval;
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char *string;
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void *stack; /* xpath_tree */
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}
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%token <intval> AXISNAME
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%token <intval> LOGOP
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%token <intval> ADDOP
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%token <intval> RELOP
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%token <dval> NUMBER
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%token <string> X_EOF
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%token <string> QUOTE
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%token <string> APOST
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%token <string> CHAR
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%token <string> NAME
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%token <string> NODETYPE
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%token <string> DOUBLEDOT
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%token <string> DOUBLECOLON
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%token <string> DOUBLESLASH
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%token <string> FUNCTIONNAME
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%type <intval> axisspec
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%type <string> string
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%type <stack> expr
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%type <stack> andexpr
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%type <stack> relexpr
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%type <stack> addexpr
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%type <stack> unionexpr
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%type <stack> pathexpr
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%type <stack> locationpath
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%type <stack> abslocpath
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%type <stack> rellocpath
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%type <stack> step
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%type <stack> nodetest
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%type <stack> predicates
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%type <stack> primaryexpr
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%lex-param {void *_xy} /* Add this argument to parse() and lex() function */
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%parse-param {void *_xy}
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%{
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/* Here starts user C-code */
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/* typecast macro */
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#define _XY ((struct clicon_xpath_yacc_arg *)_xy)
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#define _YYERROR(msg) {clicon_err(OE_XML, 0, "YYERROR %s '%s' %d", (msg), clixon_xpath_parsetext, _XY->xy_linenum); YYERROR;}
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/* add _yy to error paramaters */
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#define YY_(msgid) msgid
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#include "clixon_config.h"
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#include <stdio.h>
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#include <string.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <fnmatch.h>
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#include <assert.h>
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#include <ctype.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <net/if.h>
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#include <cligen/cligen.h>
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#include "clixon_err.h"
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#include "clixon_log.h"
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#include "clixon_queue.h"
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#include "clixon_string.h"
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#include "clixon_hash.h"
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#include "clixon_handle.h"
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#include "clixon_yang.h"
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#include "clixon_xml.h"
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#include "clixon_xpath_ctx.h"
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#include "clixon_xpath.h"
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#include "clixon_xpath_parse.h"
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extern int clixon_xpath_parseget_lineno (void);
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/*
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also called from yacc generated code *
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*/
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void
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clixon_xpath_parseerror(void *_xy,
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char *s)
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{
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clicon_err(OE_XML, 0, "%s on line %d: %s at or before: '%s'",
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_XY->xy_name,
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_XY->xy_linenum ,
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s,
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clixon_xpath_parsetext);
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return;
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}
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int
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xpath_parse_init(struct clicon_xpath_yacc_arg *xy)
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{
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// clicon_debug_init(2, NULL);
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return 0;
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}
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int
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xpath_parse_exit(struct clicon_xpath_yacc_arg *xy)
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{
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return 0;
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}
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static xpath_tree *
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xp_new(enum xp_type type,
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int i0,
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double d0,
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char *s0,
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char *s1,
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xpath_tree *c0,
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xpath_tree *c1)
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{
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xpath_tree *xs = NULL;
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if ((xs = malloc(sizeof(xpath_tree))) == NULL){
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clicon_err(OE_XML, errno, "malloc");
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goto done;
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}
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memset(xs, 0, sizeof(*xs));
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xs->xs_type = type;
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xs->xs_int = i0;
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xs->xs_double = d0;
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xs->xs_s0 = s0;
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xs->xs_s1 = s1;
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xs->xs_c0 = c0;
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xs->xs_c1 = c1;
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done:
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return xs;
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}
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%}
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%%
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/*
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*/
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start : expr X_EOF { _XY->xy_top=$1;clicon_debug(2,"start->expr"); YYACCEPT; }
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| locationpath X_EOF { _XY->xy_top=$1;clicon_debug(2,"start->locationpath"); YYACCEPT; }
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;
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expr : expr LOGOP andexpr { $$=xp_new(XP_EXP,$2,0.0,NULL,NULL,$1, $3);clicon_debug(2,"expr->expr or andexpr"); }
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| andexpr { $$=xp_new(XP_EXP,A_NAN,0.0,NULL,NULL,$1, NULL);clicon_debug(2,"expr-> andexpr"); }
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;
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andexpr : andexpr LOGOP relexpr { $$=xp_new(XP_AND,$2,0.0,NULL,NULL,$1, $3);clicon_debug(2,"andexpr-> andexpr and relexpr"); }
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| relexpr { $$=xp_new(XP_AND,A_NAN,0.0,NULL,NULL,$1, NULL);clicon_debug(2,"andexpr-> relexpr"); }
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;
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relexpr : relexpr RELOP addexpr { $$=xp_new(XP_RELEX,$2,0.0,NULL,NULL,$1, $3);clicon_debug(2,"relexpr-> relexpr relop addexpr"); }
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| addexpr { $$=xp_new(XP_RELEX,A_NAN,0.0,NULL,NULL,$1, NULL);clicon_debug(2,"relexpr-> addexpr"); }
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;
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addexpr : addexpr ADDOP unionexpr { $$=xp_new(XP_ADD,$2,0.0,NULL,NULL,$1, $3);clicon_debug(2,"addexpr-> addexpr ADDOP unionexpr"); }
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| unionexpr { $$=xp_new(XP_ADD,A_NAN,0.0,NULL,NULL,$1, NULL);clicon_debug(2,"addexpr-> unionexpr"); }
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;
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/* node-set */
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unionexpr : unionexpr '|' pathexpr { $$=xp_new(XP_UNION,A_NAN,0.0,NULL,NULL,$1, $3);clicon_debug(2,"unionexpr-> unionexpr | pathexpr"); }
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| pathexpr { $$=xp_new(XP_UNION,A_NAN,0.0,NULL,NULL,$1, NULL);clicon_debug(2,"unionexpr-> pathexpr"); }
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;
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pathexpr : locationpath { $$=xp_new(XP_PATHEXPR,A_NAN,0.0,NULL,NULL,$1, NULL);clicon_debug(2,"pathexpr-> locationpath"); }
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| primaryexpr { $$=xp_new(XP_PATHEXPR,A_NAN,0.0,NULL,NULL,$1, NULL);clicon_debug(2,"pathexpr-> primaryexpr"); }
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;
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/* location path returns a node-set */
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locationpath : rellocpath { $$=xp_new(XP_LOCPATH,A_NAN,0.0,NULL,NULL,$1, NULL); clicon_debug(2,"locationpath-> rellocpath"); }
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| abslocpath { $$=xp_new(XP_LOCPATH,A_NAN,0.0,NULL,NULL,$1, NULL); clicon_debug(2,"locationpath-> abslocpath"); }
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;
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abslocpath : '/' { $$=xp_new(XP_ABSPATH,A_ROOT,0.0,NULL,NULL,NULL, NULL);clicon_debug(2,"abslocpath-> /"); }
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| '/' rellocpath { $$=xp_new(XP_ABSPATH,A_ROOT,0.0,NULL,NULL,$2, NULL);clicon_debug(2,"abslocpath->/ rellocpath");}
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/* // is short for /descendant-or-self::node()/ */
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| DOUBLESLASH rellocpath {$$=xp_new(XP_ABSPATH,A_DESCENDANT_OR_SELF,0.0,NULL,NULL,$2, NULL); clicon_debug(2,"abslocpath-> // rellocpath"); }
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;
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rellocpath : step { $$=xp_new(XP_RELLOCPATH,A_NAN,0.0,NULL,NULL,$1, NULL); clicon_debug(2,"rellocpath-> step"); }
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| rellocpath '/' step { $$=xp_new(XP_RELLOCPATH,A_NAN,0.0,NULL,NULL,$1, $3);clicon_debug(2,"rellocpath-> rellocpath / step"); }
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| rellocpath DOUBLESLASH step { $$=xp_new(XP_RELLOCPATH,A_DESCENDANT_OR_SELF,0.0,NULL,NULL,$1, $3); clicon_debug(2,"rellocpath-> rellocpath // step"); }
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;
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step : axisspec nodetest predicates {$$=xp_new(XP_STEP,$1,0.0, NULL, NULL, $2, $3);clicon_debug(2,"step->axisspec(%d) nodetest", $1); }
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| '.' predicates { $$=xp_new(XP_STEP,A_SELF, 0.0,NULL, NULL, NULL, $2); clicon_debug(2,"step-> ."); }
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| DOUBLEDOT predicates { $$=xp_new(XP_STEP, A_PARENT, 0.0,NULL, NULL, NULL, $2); clicon_debug(2,"step-> .."); }
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;
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axisspec : AXISNAME DOUBLECOLON { clicon_debug(2,"axisspec-> AXISNAME(%d) ::", $1); $$=$1;}
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| '@' { $$=A_ATTRIBUTE; clicon_debug(2,"axisspec-> @"); }
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| { clicon_debug(2,"axisspec-> "); $$=A_CHILD;}
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;
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nodetest : '*' { $$=xp_new(XP_NODE,A_NAN,0.0, NULL, NULL, NULL, NULL); clicon_debug(2,"nodetest-> *"); }
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| NAME { $$=xp_new(XP_NODE,A_NAN,0.0, NULL, $1, NULL, NULL); clicon_debug(2,"nodetest-> name(%s)",$1); }
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| NAME ':' NAME { $$=xp_new(XP_NODE,A_NAN,0.0, $1, $3, NULL, NULL);clicon_debug(2,"nodetest-> name(%s) : name(%s)", $1, $3); }
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| NAME ':' '*' { $$=xp_new(XP_NODE,A_NAN,0.0, $1, NULL, NULL, NULL);clicon_debug(2,"nodetest-> name(%s) : *", $1); }
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| NODETYPE '(' ')' { $$=xp_new(XP_NODE_FN,A_NAN,0.0, $1, NULL, NULL, NULL); clicon_debug(2,"nodetest-> nodetype()"); }
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;
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/* evaluates to boolean */
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predicates : predicates '[' expr ']' { $$=xp_new(XP_PRED,A_NAN,0.0, NULL, NULL, $1, $3); clicon_debug(2,"predicates-> [ expr ]"); }
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| { $$=xp_new(XP_PRED,A_NAN,0.0, NULL, NULL, NULL, NULL); clicon_debug(2,"predicates->"); }
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;
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primaryexpr : '(' expr ')' { $$=xp_new(XP_PRI0,A_NAN,0.0, NULL, NULL, $2, NULL); clicon_debug(2,"primaryexpr-> ( expr )"); }
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| NUMBER { $$=xp_new(XP_PRIME_NR,A_NAN, $1, NULL, NULL, NULL, NULL);clicon_debug(2,"primaryexpr-> NUMBER(%lf)", $1); }
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| QUOTE string QUOTE { $$=xp_new(XP_PRIME_STR,A_NAN,0.0, $2, NULL, NULL, NULL);clicon_debug(2,"primaryexpr-> \" string \""); }
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| QUOTE QUOTE { $$=xp_new(XP_PRIME_STR,A_NAN,0.0, NULL, NULL, NULL, NULL);clicon_debug(2,"primaryexpr-> \" \""); }
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| APOST string APOST { $$=xp_new(XP_PRIME_STR,A_NAN,0.0, $2, NULL, NULL, NULL);clicon_debug(2,"primaryexpr-> ' string '"); }
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| APOST APOST { $$=xp_new(XP_PRIME_STR,A_NAN,0.0, NULL, NULL, NULL, NULL);clicon_debug(2,"primaryexpr-> ' '"); }
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| FUNCTIONNAME '(' ')' { $$=xp_new(XP_PRIME_FN,A_NAN,0.0, $1, NULL, NULL, NULL);clicon_debug(2,"primaryexpr-> functionname ( arguments )"); }
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;
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/* XXX Adding this between FUNCTIONNAME() breaks parser,..
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arguments : arguments expr { clicon_debug(2,"arguments-> arguments expr"); }
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| { clicon_debug(2,"arguments-> "); }
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;
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*/
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string : string CHAR {
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int len = strlen($1);
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$$ = realloc($1, len+strlen($2) + 1);
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sprintf($$+len, "%s", $2);
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free($2);
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clicon_debug(2,"string-> string CHAR");
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}
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| CHAR { clicon_debug(2,"string-> "); }
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;
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%%
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