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/*
* ============LICENSE_START=======================================================
* Copyright (C) 2021 Nordix Foundation
* ================================================================================
* 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.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
grammar CpsPath ;
cpsPath: (cpsPathWithSingleLeafCondition | cpsPathWithDescendant | cpsPathWithDescendantAndLeafConditions) ancestorAxis? ;
ancestorAxis: SLASH KW_ANCESTOR COLONCOLON ancestorPath ;
ancestorPath: yangElement (SLASH yangElement)* ;
cpsPathWithSingleLeafCondition: prefix singleValueCondition ;
/*
No need to ditinguish between cpsPathWithDescendant | cpsPathWithDescendantAndLeafConditions really!
See https://jira.onap.org/browse/CPS-436
*/
cpsPathWithDescendant: descendant ;
cpsPathWithDescendantAndLeafConditions: descendant multipleValueConditions ;
descendant: SLASH prefix ;
prefix: (SLASH yangElement)* SLASH containerName ;
yangElement: containerName listElementRef? ;
containerName: QName ;
listElementRef: multipleValueConditions ;
singleValueCondition: '[' leafCondition ']' ;
multipleValueConditions: '[' leafCondition (' and ' leafCondition)* ']' ;
leafCondition: '@' leafName '=' (IntegerLiteral | StringLiteral ) ;
//To Confirm: defintion of Lefname with external xPath grammar
leafName: QName ;
/*
* Lexer Rules
* Most of the lexer rules below are 'imporetd' from
* https://raw.githubusercontent.com/antlr/grammars-v4/master/xpath/xpath31/XPath31.g4
*/
SLASH : '/';
COLONCOLON : '::' ;
// KEYWORDS
KW_ANCESTOR : 'ancestor' ;
IntegerLiteral : FragDigits ;
// Add below type definitions for leafvalue comparision in https://jira.onap.org/browse/CPS-440
DecimalLiteral : ('.' FragDigits) | (FragDigits '.' [0-9]*) ;
DoubleLiteral : (('.' FragDigits) | (FragDigits ('.' [0-9]*)?)) [eE] [+-]? FragDigits ;
StringLiteral : ('"' (FragEscapeQuot | ~[^"])*? '"') | ('\'' (FragEscapeApos | ~['])*? '\'') ;
fragment FragEscapeQuot : '""' ;
fragment FragEscapeApos : '\'';
fragment FragDigits : [0-9]+ ;
QName : FragQName ;
NCName : FragmentNCName ;
fragment FragQName : FragPrefixedName | FragUnprefixedName ;
fragment FragPrefixedName : FragPrefix ':' FragLocalPart ;
fragment FragUnprefixedName : FragLocalPart ;
fragment FragPrefix : FragmentNCName ;
fragment FragLocalPart : FragmentNCName ;
fragment FragNCNameStartChar
: 'A'..'Z'
| '_'
| 'a'..'z'
| '\u00C0'..'\u00D6'
| '\u00D8'..'\u00F6'
| '\u00F8'..'\u02FF'
| '\u0370'..'\u037D'
| '\u037F'..'\u1FFF'
| '\u200C'..'\u200D'
| '\u2070'..'\u218F'
| '\u2C00'..'\u2FEF'
| '\u3001'..'\uD7FF'
| '\uF900'..'\uFDCF'
| '\uFDF0'..'\uFFFD'
| '\u{10000}'..'\u{EFFFF}'
;
fragment FragNCNameChar
: FragNCNameStartChar | '-' | '.' | '0'..'9'
| '\u00B7' | '\u0300'..'\u036F'
| '\u203F'..'\u2040'
;
fragment FragmentNCName : FragNCNameStartChar FragNCNameChar* ;
// https://www.w3.org/TR/REC-xml/#NT-Char
fragment FragChar : '\u0009' | '\u000a' | '\u000d'
| '\u0020'..'\ud7ff'
| '\ue000'..'\ufffd'
| '\u{10000}'..'\u{10ffff}'
;
// Skip all Whitespace
Whitespace : ('\u000d' | '\u000a' | '\u0020' | '\u0009')+ -> skip ;
// handle characters which failed to match any other token (otherwise Antlr will ignore them)
ErrorCharacter : . ;
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