[ONOS-3877] Implement Yang grammar for leaf,leaf-list,augment,grouping/uses
[ONOS-3917] YANG LEXER
Change-Id: Ic2476cd97b9b2b5b557a93fb975cc89002ff4464
diff --git a/utils/yangutils/src/main/resources/GeneratedYang.g4 b/utils/yangutils/src/main/resources/GeneratedYang.g4
new file mode 100644
index 0000000..c5dcf26
--- /dev/null
+++ b/utils/yangutils/src/main/resources/GeneratedYang.g4
@@ -0,0 +1,1226 @@
+/*
+ * Copyright 2016 Open Networking Laboratory
+ *
+ * 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.
+ */
+
+/**
+ * This is a YANG grammar for parser based on which ANTLR will generate YANG parser.
+ */
+
+grammar GeneratedYang;
+import YangLexer;
+
+@header {
+package org.onosproject.yangutils.parser.antlrgencode;
+}
+
+ yangfile : module_stmt
+ | submodule_stmt;
+
+ /**
+ * module-stmt = optsep module-keyword sep identifier-arg-str
+ * optsep
+ * "{" stmtsep
+ * module-header-stmts
+ * linkage-stmts
+ * meta-stmts
+ * revision-stmts
+ * body-stmts
+ * "}" optsep
+ */
+
+ module_stmt : MODULE_KEYWORD IDENTIFIER LEFT_CURLY_BRACE module_body* RIGHT_CURLY_BRACE;
+
+ module_body : module_header_statement linkage_stmts meta_stmts revision_stmts body_stmts;
+
+ /**
+ * module-header-stmts = ;; these stmts can appear in any order
+ * [yang-version-stmt stmtsep]
+ * namespace-stmt stmtsep
+ * prefix-stmt stmtsep
+ */
+
+ module_header_statement : yang_version_stmt? namespace_stmt prefix_stmt
+ | yang_version_stmt? prefix_stmt namespace_stmt
+ | namespace_stmt yang_version_stmt? prefix_stmt
+ | namespace_stmt prefix_stmt yang_version_stmt?
+ | prefix_stmt namespace_stmt yang_version_stmt?
+ | prefix_stmt yang_version_stmt? namespace_stmt?
+ ;
+
+ /**
+ * linkage-stmts = ;; these stmts can appear in any order
+ * *(import-stmt stmtsep)
+ * *(include-stmt stmtsep)
+ */
+
+ linkage_stmts : (import_stmt
+ | include_stmt)*;
+
+ /**
+ * meta-stmts = ;; these stmts can appear in any order
+ * [organization-stmt stmtsep]
+ * [contact-stmt stmtsep]
+ * [description-stmt stmtsep]
+ * [reference-stmt stmtsep]
+ */
+
+ meta_stmts : organization_stmt? contact_stmt? description_stmt? reference_stmt?
+ | organization_stmt? contact_stmt? reference_stmt? description_stmt?
+ | organization_stmt? description_stmt? contact_stmt? reference_stmt?
+ | organization_stmt? description_stmt? reference_stmt? contact_stmt?
+ | organization_stmt? reference_stmt? contact_stmt? description_stmt?
+ | organization_stmt? reference_stmt? description_stmt? contact_stmt?
+ | contact_stmt? organization_stmt? description_stmt? reference_stmt?
+ | contact_stmt? organization_stmt? reference_stmt? description_stmt?
+ | contact_stmt? reference_stmt? organization_stmt? description_stmt?
+ | contact_stmt? reference_stmt? description_stmt? organization_stmt?
+ | contact_stmt? description_stmt? reference_stmt? organization_stmt?
+ | contact_stmt? description_stmt? organization_stmt? reference_stmt?
+ | reference_stmt? contact_stmt? organization_stmt? description_stmt?
+ | reference_stmt? contact_stmt? description_stmt? organization_stmt?
+ | reference_stmt? organization_stmt? contact_stmt? description_stmt?
+ | reference_stmt? organization_stmt? description_stmt? contact_stmt?
+ | reference_stmt? description_stmt? organization_stmt? contact_stmt?
+ | reference_stmt? description_stmt? contact_stmt? organization_stmt?
+ | description_stmt? reference_stmt? contact_stmt? organization_stmt?
+ | description_stmt? reference_stmt? organization_stmt? contact_stmt?
+ | description_stmt? contact_stmt? reference_stmt? organization_stmt?
+ | description_stmt? contact_stmt? organization_stmt? reference_stmt?
+ | description_stmt? organization_stmt? contact_stmt? reference_stmt?
+ | description_stmt? organization_stmt? reference_stmt? contact_stmt?
+ ;
+
+ // revision-stmts = *(revision-stmt stmtsep)
+ revision_stmts : revision_stmt*;
+
+ /**
+ * body-stmts = *((extension-stmt /
+ * feature-stmt /
+ * identity-stmt /
+ * typedef-stmt /
+ * grouping-stmt /
+ * data-def-stmt /
+ * augment-stmt /
+ * rpc-stmt /
+ * notification-stmt /
+ * deviation-stmt) stmtsep)
+ */
+
+ body_stmts : (extension_stmt
+ | feature_stmt
+ | identity_stmt
+ | typedef_stmt
+ | grouping_stmt
+ | data_def_stmt
+ | augment_stmt
+ | rpc_stmt
+ | notification_stmt
+ | deviation_stmt)*
+ ;
+
+ /**
+ * yang-version-stmt = yang-version-keyword sep yang-version-arg-str
+ * optsep stmtend
+ */
+
+ yang_version_stmt : YANG_VERSION_KEYWORD INTEGER STMTEND;
+
+
+ /**
+ * namespace-stmt = namespace-keyword sep uri-str optsep stmtend
+ * For namespace validation TODO in Listener
+ */
+ namespace_stmt : NAMESPACE_KEYWORD string STMTEND;
+
+ /**
+ * prefix-stmt = prefix-keyword sep prefix-arg-str
+ * optsep stmtend
+ */
+ prefix_stmt : PREFIX_KEYWORD IDENTIFIER STMTEND;
+
+ /**
+ * import-stmt = import-keyword sep identifier-arg-str optsep
+ * "{" stmtsep
+ * prefix-stmt stmtsep
+ * [revision-date-stmt stmtsep]
+ * "}"
+ */
+ import_stmt : IMPORT_KEYWORD IDENTIFIER LEFT_CURLY_BRACE import_stmt_body RIGHT_CURLY_BRACE;
+
+ import_stmt_body : prefix_stmt revision_date_stmt?;
+
+ // revision-date-stmt = revision-date-keyword sep revision-date stmtend
+ revision_date_stmt : REVISION_DATE_KEYWORD DATE_ARG STMTEND;
+
+ revision_date_stmt_body : revision_date_stmt;
+
+ /**
+ * include-stmt = include-keyword sep identifier-arg-str optsep
+ * (";" /
+ * "{" stmtsep
+ * [revision-date-stmt stmtsep]
+ * "}")
+ */
+ include_stmt : INCLUDE_KEYWORD IDENTIFIER (STMTEND | LEFT_CURLY_BRACE revision_date_stmt_body? RIGHT_CURLY_BRACE);
+
+ /**
+ * organization-stmt = organization-keyword sep string
+ * optsep stmtend
+ */
+ organization_stmt : ORGANIZATION_KEYWORD string STMTEND;
+
+ // contact-stmt = contact-keyword sep string optsep stmtend
+ contact_stmt : CONTACT_KEYWORD string STMTEND;
+
+ // description-stmt = description-keyword sep string optsep stmtend
+ description_stmt : DESCRIPTION_KEYWORD string STMTEND;
+
+ // reference-stmt = reference-keyword sep string optsep stmtend
+ reference_stmt : REFERENCE_KEYWORD string STMTEND;
+
+ /**
+ * revision-stmt = revision-keyword sep revision-date optsep
+ * (";" /
+ * "{" stmtsep
+ * [description-stmt stmtsep]
+ * [reference-stmt stmtsep]
+ * "}")
+ */
+ revision_stmt : REVISION_KEYWORD DATE_ARG (STMTEND | LEFT_CURLY_BRACE revision_stmt_body RIGHT_CURLY_BRACE);
+ revision_stmt_body : description_stmt? reference_stmt?;
+
+ /**
+ * submodule-stmt = optsep submodule-keyword sep identifier-arg-str
+ * optsep
+ * "{" stmtsep
+ * submodule-header-stmts
+ * linkage-stmts
+ * meta-stmts
+ * revision-stmts
+ * body-stmts
+ * "}" optsep
+ */
+ submodule_stmt : SUBMODULE_KEYWORD IDENTIFIER LEFT_CURLY_BRACE submodule_body* RIGHT_CURLY_BRACE;
+ submodule_body : submodule_header_statement linkage_stmts meta_stmts revision_stmts body_stmts;
+
+ /** submodule-header-stmts =
+ * ;; these stmts can appear in any order
+ * [yang-version-stmt stmtsep]
+ * belongs-to-stmt stmtsep
+ */
+ submodule_header_statement : yang_version_stmt? belongs_to_stmt
+ | belongs_to_stmt yang_version_stmt?
+ ;
+
+ /**
+ * belongs-to-stmt = belongs-to-keyword sep identifier-arg-str
+ * optsep
+ * "{" stmtsep
+ * prefix-stmt stmtsep
+ * "}"
+ */
+ belongs_to_stmt : BELONGS_TO_KEYWORD IDENTIFIER LEFT_CURLY_BRACE belongs_to_stmt_body RIGHT_CURLY_BRACE;
+ belongs_to_stmt_body : prefix_stmt;
+
+ /**
+ * extension-stmt = extension-keyword sep identifier-arg-str optsep
+ * (";" /
+ * "{" stmtsep
+ * ;; these stmts can appear in any order
+ * [argument-stmt stmtsep]
+ * [status-stmt stmtsep]
+ * [description-stmt stmtsep]
+ * [reference-stmt stmtsep]
+ * "}")
+ */
+ extension_stmt : EXTENSION_KEYWORD IDENTIFIER (STMTEND | LEFT_CURLY_BRACE extension_body RIGHT_CURLY_BRACE);
+ extension_body : argument_stmt? status_stmt? description_stmt? reference_stmt?
+ | argument_stmt? status_stmt? reference_stmt? description_stmt?
+ | argument_stmt? description_stmt? status_stmt? reference_stmt?
+ | argument_stmt? description_stmt? reference_stmt? status_stmt?
+ | argument_stmt? reference_stmt? description_stmt? status_stmt?
+ | argument_stmt? reference_stmt? status_stmt? description_stmt?
+ | status_stmt? reference_stmt? argument_stmt? description_stmt?
+ | status_stmt? reference_stmt? description_stmt? argument_stmt?
+ | status_stmt? description_stmt? reference_stmt? argument_stmt?
+ | status_stmt? description_stmt? argument_stmt? reference_stmt?
+ | status_stmt? argument_stmt? reference_stmt? description_stmt?
+ | status_stmt? argument_stmt? description_stmt? reference_stmt?
+ | description_stmt? argument_stmt? status_stmt? reference_stmt?
+ | description_stmt? argument_stmt? reference_stmt? status_stmt?
+ | description_stmt? status_stmt? argument_stmt? reference_stmt?
+ | description_stmt? status_stmt? reference_stmt? argument_stmt?
+ | description_stmt? reference_stmt? status_stmt? argument_stmt?
+ | description_stmt? reference_stmt? argument_stmt? status_stmt?
+ | reference_stmt? description_stmt? argument_stmt? status_stmt?
+ | reference_stmt? description_stmt? status_stmt? argument_stmt?
+ | reference_stmt? status_stmt? argument_stmt? description_stmt?
+ | reference_stmt? status_stmt? description_stmt? argument_stmt?
+ | reference_stmt? argument_stmt? description_stmt? status_stmt?
+ | reference_stmt? argument_stmt? status_stmt? description_stmt?
+ ;
+
+ /**
+ * argument-stmt = argument-keyword sep identifier-arg-str optsep
+ * (";" /
+ * "{" stmtsep
+ * [yin-element-stmt stmtsep]
+ * "}")
+ */
+ argument_stmt : ARGUMENT_KEYWORD IDENTIFIER (STMTEND | LEFT_CURLY_BRACE argument_body RIGHT_CURLY_BRACE);
+ argument_body : yin_element_stmt?;
+
+ /**
+ * yin-element-stmt = yin-element-keyword sep yin-element-arg-str
+ * stmtend
+ */
+ yin_element_stmt : YIN_ELEMENT_KEYWORD (TRUE_KEYWORD | FALSE_KEYWORD) STMTEND;
+
+ /**
+ * identity-stmt = identity-keyword sep identifier-arg-str optsep
+ * (";" /
+ * "{" stmtsep
+ * ;; these stmts can appear in any order
+ * [base-stmt stmtsep]
+ * [status-stmt stmtsep]
+ * [description-stmt stmtsep]
+ * [reference-stmt stmtsep]
+ * "}")
+ */
+ identity_stmt : IDENTITY_KEYWORD IDENTIFIER (STMTEND | LEFT_CURLY_BRACE identity_body RIGHT_CURLY_BRACE);
+ identity_body : base_stmt? status_stmt? description_stmt? reference_stmt?
+ | base_stmt? status_stmt? reference_stmt? description_stmt?
+ | base_stmt? description_stmt? status_stmt? reference_stmt?
+ | base_stmt? description_stmt? reference_stmt? status_stmt?
+ | base_stmt? reference_stmt? description_stmt? status_stmt?
+ | base_stmt? reference_stmt? status_stmt? description_stmt?
+ | reference_stmt? base_stmt? status_stmt? description_stmt?
+ | reference_stmt? base_stmt? description_stmt? status_stmt?
+ | reference_stmt? status_stmt? base_stmt? description_stmt?
+ | reference_stmt? status_stmt? description_stmt? base_stmt?
+ | reference_stmt? description_stmt? status_stmt? base_stmt?
+ | reference_stmt? description_stmt? base_stmt? status_stmt?
+ | description_stmt? reference_stmt? status_stmt? base_stmt?
+ | description_stmt? reference_stmt? status_stmt? base_stmt?
+ | description_stmt? reference_stmt? base_stmt? status_stmt?
+ | description_stmt? status_stmt? base_stmt? reference_stmt?
+ | description_stmt? status_stmt? reference_stmt? base_stmt?
+ | description_stmt? base_stmt? reference_stmt? status_stmt?
+ | description_stmt? base_stmt? status_stmt? reference_stmt?
+ | status_stmt? base_stmt? description_stmt? reference_stmt?
+ | status_stmt? base_stmt? reference_stmt? description_stmt?
+ | status_stmt? description_stmt? base_stmt? reference_stmt?
+ | status_stmt? description_stmt? reference_stmt? base_stmt?
+ | status_stmt? reference_stmt? description_stmt? base_stmt?
+ | status_stmt? reference_stmt? base_stmt? description_stmt?
+ ;
+
+ /**
+ * base-stmt = base-keyword sep identifier-ref-arg-str
+ * optsep stmtend*
+ * identifier-ref-arg = [prefix ":"] identifier
+ */
+ base_stmt : BASE_KEYWORD string STMTEND;
+
+ /**
+ * feature-stmt = feature-keyword sep identifier-arg-str optsep
+ * (";" /
+ * "{" stmtsep
+ * ;; these stmts can appear in any order
+ * *(if-feature-stmt stmtsep)
+ * [status-stmt stmtsep]
+ * [description-stmt stmtsep]
+ * [reference-stmt stmtsep]
+ * "}")
+ */
+ feature_stmt : FEATURE_KEYWORD string (STMTEND | LEFT_CURLY_BRACE feature_body RIGHT_CURLY_BRACE);
+ feature_body : if_feature_stmt* status_stmt? description_stmt? reference_stmt?
+ | if_feature_stmt* status_stmt? reference_stmt? description_stmt?
+ | if_feature_stmt* description_stmt? status_stmt? reference_stmt?
+ | if_feature_stmt* description_stmt? reference_stmt? status_stmt?
+ | if_feature_stmt* reference_stmt? status_stmt? description_stmt?
+ | if_feature_stmt* reference_stmt? description_stmt? status_stmt?
+ | status_stmt? if_feature_stmt* description_stmt? reference_stmt?
+ | status_stmt? if_feature_stmt* reference_stmt? description_stmt?
+ | status_stmt? description_stmt? if_feature_stmt* reference_stmt?
+ | status_stmt? description_stmt? reference_stmt? if_feature_stmt*
+ | status_stmt? reference_stmt? if_feature_stmt* description_stmt?
+ | status_stmt? reference_stmt? description_stmt? if_feature_stmt*
+ | description_stmt? if_feature_stmt* status_stmt? reference_stmt?
+ | description_stmt? if_feature_stmt* reference_stmt? status_stmt?
+ | description_stmt? status_stmt? if_feature_stmt* reference_stmt?
+ | description_stmt? status_stmt? reference_stmt? if_feature_stmt*
+ | description_stmt? reference_stmt* status_stmt? if_feature_stmt*
+ | description_stmt? reference_stmt* if_feature_stmt? status_stmt?
+ | reference_stmt? if_feature_stmt* status_stmt? description_stmt?
+ | reference_stmt? if_feature_stmt* description_stmt? status_stmt?
+ | reference_stmt? description_stmt? status_stmt? if_feature_stmt*
+ | reference_stmt? description_stmt? if_feature_stmt* status_stmt?
+ | reference_stmt? status_stmt? description_stmt? if_feature_stmt*
+ | reference_stmt? status_stmt? if_feature_stmt* description_stmt?
+ ;
+
+ /**
+ * data-def-stmt = container-stmt /
+ * leaf-stmt /
+ * leaf-list-stmt /
+ * list-stmt /
+ * choice-stmt /
+ * anyxml-stmt /
+ * uses-stmt
+ */
+ data_def_stmt : container_stmt
+ | leaf_stmt
+ | leaf_list_stmt
+ | list_stmt
+ | choice_stmt
+ | uses_stmt;
+
+ /**
+ * if-feature-stmt = if-feature-keyword sep identifier-ref-arg-str
+ * optsep stmtend
+ */
+ if_feature_stmt : IF_FEATURE_KEYWORD string STMTEND;
+
+ /**
+ * units-stmt = units-keyword sep string optsep stmtend
+ */
+ units_stmt : UNITS_KEYWORD string STMTEND;
+
+ /**
+ * typedef-stmt = typedef-keyword sep identifier-arg-str optsep
+ * "{" stmtsep
+ * ;; these stmts can appear in any order
+ * type-stmt stmtsep
+ * [units-stmt stmtsep]
+ * [default-stmt stmtsep]
+ * [status-stmt stmtsep]
+ * [description-stmt stmtsep]
+ * [reference-stmt stmtsep]
+ * "}"
+ * TODO : 0..1 occurance to be validated in listener
+ */
+ typedef_stmt : TYPEDEF_KEYWORD IDENTIFIER LEFT_CURLY_BRACE
+ (type_stmt | units_stmt | default_stmt | status_stmt | description_stmt | reference_stmt)*
+ RIGHT_CURLY_BRACE;
+
+ /**
+ * type-stmt = type-keyword sep identifier-ref-arg-str optsep
+ * (";" /
+ * "{" stmtsep
+ * type-body-stmts
+ * "}")
+ */
+ type_stmt : TYPE_KEYWORD string (STMTEND | LEFT_CURLY_BRACE type_body_stmts RIGHT_CURLY_BRACE);
+
+ /**
+ * type-body-stmts = numerical-restrictions /
+ * decimal64-specification /
+ * string-restrictions /
+ * enum-specification /
+ * leafref-specification /
+ * identityref-specification /
+ * instance-identifier-specification /
+ * bits-specification /
+ * union-specification
+ * TODO : decimal64-specification to be added
+ */
+ type_body_stmts : numerical_restrictions | string_restrictions | enum_specification
+ | leafref_specification | identityref_specification | instance_identifier_specification
+ | bits_specification | union_specification;
+
+ /**
+ * numerical-restrictions = range-stmt stmtsep
+ */
+ numerical_restrictions : range_stmt;
+
+ /**
+ * range-stmt = range-keyword sep range-arg-str optsep
+ * (";" /
+ * "{" stmtsep
+ * ;; these stmts can appear in any order
+ * [error-message-stmt stmtsep]
+ * [error-app-tag-stmt stmtsep]
+ * [description-stmt stmtsep]
+ * [reference-stmt stmtsep]
+ * "}")
+ */
+ range_stmt : RANGE_KEYWORD string (STMTEND | LEFT_CURLY_BRACE common_stmts RIGHT_CURLY_BRACE);
+
+ common_stmts : error_message_stmt? error_app_tag_stmt? description_stmt? reference_stmt?
+ | error_message_stmt? error_app_tag_stmt? reference_stmt? description_stmt?
+ | error_message_stmt? description_stmt? error_app_tag_stmt? reference_stmt?
+ | error_message_stmt? description_stmt? reference_stmt? error_app_tag_stmt?
+ | error_message_stmt? reference_stmt? error_app_tag_stmt? description_stmt?
+ | error_message_stmt? reference_stmt? description_stmt? error_app_tag_stmt?
+ | error_app_tag_stmt? error_message_stmt? description_stmt? reference_stmt?
+ | error_app_tag_stmt? error_message_stmt? reference_stmt? description_stmt?
+ | error_app_tag_stmt? description_stmt? description_stmt? error_message_stmt?
+ | error_app_tag_stmt? description_stmt? error_message_stmt? description_stmt?
+ | error_app_tag_stmt? reference_stmt? error_message_stmt? description_stmt?
+ | error_app_tag_stmt? reference_stmt? description_stmt? error_message_stmt?
+ | description_stmt? error_message_stmt? error_app_tag_stmt? reference_stmt?
+ | description_stmt? error_message_stmt? reference_stmt? error_app_tag_stmt?
+ | description_stmt? error_app_tag_stmt? error_message_stmt? reference_stmt?
+ | description_stmt? error_app_tag_stmt? reference_stmt? error_message_stmt?
+ | description_stmt? reference_stmt? error_message_stmt? error_app_tag_stmt?
+ | description_stmt? reference_stmt? error_app_tag_stmt? error_message_stmt?
+ | reference_stmt? error_message_stmt? description_stmt? error_app_tag_stmt?
+ | reference_stmt? error_message_stmt? error_app_tag_stmt? description_stmt?
+ | reference_stmt? error_app_tag_stmt? description_stmt? error_message_stmt?
+ | reference_stmt? error_app_tag_stmt? error_message_stmt? description_stmt?
+ | reference_stmt? description_stmt? error_message_stmt? error_app_tag_stmt?
+ | reference_stmt? description_stmt? error_app_tag_stmt? error_message_stmt?
+ ;
+
+ /**
+ * string-restrictions = ;; these stmts can appear in any order
+ * [length-stmt stmtsep]
+ * *(pattern-stmt stmtsep)
+ */
+ string_restrictions : ((length_stmt)? (pattern_stmt)*) | ((pattern_stmt)* (length_stmt)?);
+
+ /**
+ * length-stmt = length-keyword sep length-arg-str optsep
+ * (";" /
+ * "{" stmtsep
+ * ;; these stmts can appear in any order
+ * [error-message-stmt stmtsep]
+ * [error-app-tag-stmt stmtsep]
+ * [description-stmt stmtsep]
+ * [reference-stmt stmtsep]
+ * "}")
+ */
+ length_stmt : LENGTH_KEYWORD string
+ (STMTEND | LEFT_CURLY_BRACE common_stmts RIGHT_CURLY_BRACE);
+
+ /**
+ * pattern-stmt = pattern-keyword sep string optsep
+ * (";" /
+ * "{" stmtsep
+ * ;; these stmts can appear in any order
+ * [error-message-stmt stmtsep]
+ * [error-app-tag-stmt stmtsep]
+ * [description-stmt stmtsep]
+ * [reference-stmt stmtsep]
+ * "}")
+ */
+ pattern_stmt : PATTERN_KEYWORD string (STMTEND | LEFT_CURLY_BRACE common_stmts RIGHT_CURLY_BRACE);
+
+ /**
+ * default-stmt = default-keyword sep string stmtend
+ */
+ default_stmt : DEFAULT_KEYWORD string STMTEND;
+
+ /**
+ * enum-specification = 1*(enum-stmt stmtsep)
+ */
+ enum_specification : enum_stmt+;
+
+ /**
+ * enum-stmt = enum-keyword sep string optsep
+ * (";" /
+ * "{" stmtsep
+ * ;; these stmts can appear in any order
+ * [value-stmt stmtsep]
+ * [status-stmt stmtsep]
+ * [description-stmt stmtsep]
+ * [reference-stmt stmtsep]
+ * "}")
+ */
+ enum_stmt : ENUM_KEYWORD string (STMTEND | LEFT_CURLY_BRACE enum_stmt_body RIGHT_CURLY_BRACE);
+
+ enum_stmt_body : value_stmt? status_stmt? description_stmt? reference_stmt?
+ | value_stmt? status_stmt? reference_stmt? description_stmt?
+ | value_stmt? description_stmt? status_stmt? reference_stmt?
+ | value_stmt? description_stmt? reference_stmt? status_stmt?
+ | value_stmt? reference_stmt? status_stmt? description_stmt?
+ | value_stmt? reference_stmt? description_stmt? status_stmt?
+ | status_stmt? value_stmt? description_stmt? reference_stmt?
+ | status_stmt? value_stmt? reference_stmt? description_stmt?
+ | status_stmt? description_stmt? description_stmt? value_stmt?
+ | status_stmt? description_stmt? value_stmt? description_stmt?
+ | status_stmt? reference_stmt? value_stmt? description_stmt?
+ | status_stmt? reference_stmt? description_stmt? value_stmt?
+ | description_stmt? value_stmt? status_stmt? reference_stmt?
+ | description_stmt? value_stmt? reference_stmt? status_stmt?
+ | description_stmt? status_stmt? value_stmt? reference_stmt?
+ | description_stmt? status_stmt? reference_stmt? value_stmt?
+ | description_stmt? reference_stmt? value_stmt? status_stmt?
+ | description_stmt? reference_stmt? status_stmt? value_stmt?
+ | reference_stmt? value_stmt? description_stmt? status_stmt?
+ | reference_stmt? value_stmt? status_stmt? description_stmt?
+ | reference_stmt? status_stmt? description_stmt? value_stmt?
+ | reference_stmt? status_stmt? value_stmt? description_stmt?
+ | reference_stmt? description_stmt? value_stmt? status_stmt?
+ | reference_stmt? description_stmt? status_stmt? value_stmt?
+ ;
+
+ /**
+ * leafref-specification =
+ * ;; these stmts can appear in any order
+ * path-stmt stmtsep
+ * [require-instance-stmt stmtsep]
+ */
+ leafref_specification : (path_stmt (require_instance_stmt)?) | ((require_instance_stmt)? path_stmt);
+
+ /**
+ * path-stmt = path-keyword sep path-arg-str stmtend
+ */
+ path_stmt : PATH_KEYWORD string STMTEND;
+
+ /**
+ * require-instance-stmt = require-instance-keyword sep
+ * require-instance-arg-str stmtend
+ * require-instance-arg-str = < a string that matches the rule
+ * require-instance-arg >
+ * require-instance-arg = true-keyword / false-keyword
+ */
+ require_instance_stmt : REQUIRE_INSTANCE_KEYWORD (TRUE_KEYWORD | FALSE_KEYWORD) STMTEND;
+
+ /**
+ * instance-identifier-specification =
+ * [require-instance-stmt stmtsep]
+ */
+ instance_identifier_specification : require_instance_stmt?;
+
+ /**
+ * identityref-specification =
+ * base-stmt stmtsep
+ */
+ identityref_specification : base_stmt;
+
+ /**
+ * union-specification = 1*(type-stmt stmtsep)
+ */
+ union_specification : type_stmt+;
+
+ /**
+ * bits-specification = 1*(bit-stmt stmtsep)
+ */
+ bits_specification : bit_stmt+;
+
+ /**
+ * bit-stmt = bit-keyword sep identifier-arg-str optsep
+ * (";" /
+ * "{" stmtsep
+ * ;; these stmts can appear in any order
+ * [position-stmt stmtsep]
+ * [status-stmt stmtsep]
+ * [description-stmt stmtsep]
+ * [reference-stmt stmtsep]
+ * "}"
+ * "}")
+ */
+ bit_stmt : BIT_KEYWORD IDENTIFIER (STMTEND | LEFT_CURLY_BRACE bit_body_stmt RIGHT_CURLY_BRACE);
+
+ bit_body_stmt : position_stmt? status_stmt? description_stmt? reference_stmt?
+ | position_stmt? status_stmt? reference_stmt? description_stmt?
+ | position_stmt? description_stmt? status_stmt? reference_stmt?
+ | position_stmt? description_stmt? reference_stmt? status_stmt?
+ | position_stmt? reference_stmt? status_stmt? description_stmt?
+ | position_stmt? reference_stmt? description_stmt? status_stmt?
+ | status_stmt? position_stmt? description_stmt? reference_stmt?
+ | status_stmt? position_stmt? reference_stmt? description_stmt?
+ | status_stmt? description_stmt? description_stmt? position_stmt?
+ | status_stmt? description_stmt? position_stmt? description_stmt?
+ | status_stmt? reference_stmt? position_stmt? description_stmt?
+ | status_stmt? reference_stmt? description_stmt? position_stmt?
+ | description_stmt? position_stmt? status_stmt? reference_stmt?
+ | description_stmt? position_stmt? reference_stmt? status_stmt?
+ | description_stmt? status_stmt? position_stmt? reference_stmt?
+ | description_stmt? status_stmt? reference_stmt? position_stmt?
+ | description_stmt? reference_stmt? position_stmt? status_stmt?
+ | description_stmt? reference_stmt? status_stmt? position_stmt?
+ | reference_stmt? position_stmt? description_stmt? status_stmt?
+ | reference_stmt? position_stmt? status_stmt? description_stmt?
+ | reference_stmt? status_stmt? description_stmt? position_stmt?
+ | reference_stmt? status_stmt? position_stmt? description_stmt?
+ | reference_stmt? description_stmt? position_stmt? status_stmt?
+ | reference_stmt? description_stmt? status_stmt? position_stmt?
+ ;
+
+ /**
+ * position-stmt = position-keyword sep
+ * position-value-arg-str stmtend
+ * position-value-arg-str = < a string that matches the rule
+ * position-value-arg >
+ * position-value-arg = non-negative-integer-value
+ */
+ position_stmt : POSITION_KEYWORD INTEGER STMTEND;
+
+ /**
+ * status-stmt = status-keyword sep status-arg-str stmtend
+ * status-arg-str = < a string that matches the rule
+ * status-arg >
+ * status-arg = current-keyword /
+ * obsolete-keyword /
+ * deprecated-keyword
+ */
+ status_stmt : STATUS_KEYWORD (CURRENT_KEYWORD | OBSOLETE_KEYWORD | DEPRECATED_KEYWORD) STMTEND;
+
+ /**
+ * config-stmt = config-keyword sep
+ * config-arg-str stmtend
+ * config-arg-str = < a string that matches the rule
+ * config-arg >
+ * config-arg = true-keyword / false-keyword
+ */
+ config_stmt : CONFIG_KEYWORD (TRUE_KEYWORD | FALSE_KEYWORD) STMTEND;
+
+ /**
+ * mandatory-stmt = mandatory-keyword sep
+ * mandatory-arg-str stmtend
+ *
+ * mandatory-arg-str = < a string that matches the rule
+ * mandatory-arg >
+ *
+ * mandatory-arg = true-keyword / false-keyword
+ */
+ mandatory_stmt : MANDATORY_KEYWORD (TRUE_KEYWORD | FALSE_KEYWORD) STMTEND;
+
+ /**
+ * presence-stmt = presence-keyword sep string stmtend
+ */
+ presence_stmt : PRESENCE_KEYWORD string STMTEND;
+
+ /**
+ * ordered-by-stmt = ordered-by-keyword sep
+ * ordered-by-arg-str stmtend
+ *
+ * ordered-by-arg-str = < a string that matches the rule
+ * ordered-by-arg >
+ *
+ * ordered-by-arg = user-keyword / system-keyword
+ */
+ ordered_by_stmt : ORDERED_BY_KEYWORD (USER_KEYWORD | SYSTEM_KEYWORD) STMTEND;
+
+ /**
+ * must-stmt = must-keyword sep string optsep
+ * (";" /
+ * "{" stmtsep
+ * ;; these stmts can appear in any order
+ * [error-message-stmt stmtsep]
+ * [error-app-tag-stmt stmtsep]
+ * [description-stmt stmtsep]
+ * [reference-stmt stmtsep]
+ * "}")
+ */
+ must_stmt : MUST_KEYWORD string (STMTEND | LEFT_CURLY_BRACE common_stmts RIGHT_CURLY_BRACE);
+
+ /**
+ * error-message-stmt = error-message-keyword sep string stmtend
+ */
+ error_message_stmt : ERROR_MESSAGE_KEYWORD string STMTEND;
+
+ /**
+ * error-app-tag-stmt = error-app-tag-keyword sep string stmtend
+ */
+ error_app_tag_stmt : ERROR_APP_TAG_KEYWORD string STMTEND;
+
+ /**
+ * min-elements-stmt = min-elements-keyword sep
+ * min-value-arg-str stmtend
+ * min-value-arg-str = < a string that matches the rule
+ * min-value-arg >
+ * min-value-arg = non-negative-integer-value
+ */
+ min_elements_stmt : MIN_ELEMENTS_KEYWORD INTEGER STMTEND;
+
+ /**
+ * max-elements-stmt = max-elements-keyword sep
+ * max-value-arg-str stmtend
+ * max-value-arg-str = < a string that matches the rule
+ * max-value-arg >
+
+ */
+ max_elements_stmt : MAX_ELEMENTS_KEYWORD max_value_arg STMTEND;
+
+ /**
+ * max-value-arg = unbounded-keyword /
+ * positive-integer-value
+ */
+ max_value_arg : UNBOUNDED_KEYWORD | INTEGER;
+
+ /**
+ * value-stmt = value-keyword sep integer-value stmtend
+ */
+ value_stmt : VALUE_KEYWORD ((MINUS INTEGER) | INTEGER) STMTEND;
+
+ /**
+ * grouping-stmt = grouping-keyword sep identifier-arg-str optsep
+ * (";" /
+ * "{" stmtsep
+ * ;; these stmts can appear in any order
+ * [status-stmt stmtsep]
+ * [description-stmt stmtsep]
+ * [reference-stmt stmtsep]
+ * *((typedef-stmt /
+ * grouping-stmt) stmtsep)
+ * *(data-def-stmt stmtsep)
+ * "}")
+ * TODO : 0..1 occurance to be checked in listener
+ */
+ grouping_stmt : GROUPING_KEYWORD IDENTIFIER (STMTEND | LEFT_CURLY_BRACE
+ (status_stmt | description_stmt | reference_stmt | typedef_stmt | grouping_stmt
+ | data_def_stmt)* RIGHT_CURLY_BRACE);
+
+ /**
+ * container-stmt = container-keyword sep identifier-arg-str optsep
+ * (";" /
+ * "{" stmtsep
+ * ;; these stmts can appear in any order
+ * [when-stmt stmtsep]
+ * *(if-feature-stmt stmtsep)
+ * *(must-stmt stmtsep)
+ * [presence-stmt stmtsep]
+ * [config-stmt stmtsep]
+ * [status-stmt stmtsep]
+ * [description-stmt stmtsep]
+ * [reference-stmt stmtsep]
+ * *((typedef-stmt /
+ * grouping-stmt) stmtsep)
+ * *(data-def-stmt stmtsep)
+ * "}")
+ * TODO : 0..1 occurance to be checked in listener
+ */
+ container_stmt : CONTAINER_KEYWORD IDENTIFIER
+ (STMTEND | LEFT_CURLY_BRACE (when_stmt | if_feature_stmt | must_stmt | presence_stmt | config_stmt
+ | status_stmt | description_stmt | reference_stmt | typedef_stmt | grouping_stmt
+ | data_def_stmt)* RIGHT_CURLY_BRACE);
+
+ /**
+ * leaf-stmt = leaf-keyword sep identifier-arg-str optsep
+ * "{" stmtsep
+ * ;; these stmts can appear in any order
+ * [when-stmt stmtsep]
+ * *(if-feature-stmt stmtsep)
+ * type-stmt stmtsep
+ * [units-stmt stmtsep]
+ * *(must-stmt stmtsep)
+ * [default-stmt stmtsep]
+ * [config-stmt stmtsep]
+ * [mandatory-stmt stmtsep]
+ * [status-stmt stmtsep]
+ * [description-stmt stmtsep]
+ * [reference-stmt stmtsep]
+ * "}"
+ * TODO : 0..1 occurance to be checked in listener
+ */
+ leaf_stmt : LEAF_KEYWORD IDENTIFIER LEFT_CURLY_BRACE (when_stmt | if_feature_stmt | type_stmt | units_stmt
+ | must_stmt | default_stmt | config_stmt | mandatory_stmt | status_stmt | description_stmt
+ | reference_stmt)* RIGHT_CURLY_BRACE;
+
+ /**
+ * leaf-list-stmt = leaf-list-keyword sep identifier-arg-str optsep
+ * "{" stmtsep
+ * ;; these stmts can appear in any order
+ * [when-stmt stmtsep]
+ * *(if-feature-stmt stmtsep)
+ * type-stmt stmtsep
+ * [units-stmt stmtsep]
+ * *(must-stmt stmtsep)
+ * [config-stmt stmtsep]
+ * [min-elements-stmt stmtsep]
+ * [max-elements-stmt stmtsep]
+ * [ordered-by-stmt stmtsep]
+ * [status-stmt stmtsep]
+ * [description-stmt stmtsep]
+ * [reference-stmt stmtsep]
+ * "}"
+ * TODO : 0..1 occurance to be checked in listener
+ */
+ leaf_list_stmt : LEAF_LIST_KEYWORD IDENTIFIER LEFT_CURLY_BRACE (when_stmt | if_feature_stmt | type_stmt
+ | units_stmt | must_stmt | config_stmt | min_elements_stmt | max_elements_stmt | ordered_by_stmt
+ | status_stmt | description_stmt | reference_stmt)* RIGHT_CURLY_BRACE;
+
+ /**
+ * list-stmt = list-keyword sep identifier-arg-str optsep
+ * "{" stmtsep
+ * ;; these stmts can appear in any order
+ * [when-stmt stmtsep]
+ * *(if-feature-stmt stmtsep)
+ * *(must-stmt stmtsep)
+ * [key-stmt stmtsep]
+ * *(unique-stmt stmtsep)
+ * [config-stmt stmtsep]
+ * [min-elements-stmt stmtsep]
+ * [max-elements-stmt stmtsep]
+ * [ordered-by-stmt stmtsep]
+ * [status-stmt stmtsep]
+ * [description-stmt stmtsep]
+ * [reference-stmt stmtsep]
+ * *((typedef-stmt /
+ * grouping-stmt) stmtsep)
+ * 1*(data-def-stmt stmtsep)
+ * "}"
+ * TODO : 0..1 occurance to be checked in listener
+ */
+ list_stmt : LIST_KEYWORD IDENTIFIER LEFT_CURLY_BRACE (when_stmt | if_feature_stmt | must_stmt | key_stmt
+ | unique_stmt | config_stmt | min_elements_stmt | max_elements_stmt | ordered_by_stmt | status_stmt
+ | description_stmt | reference_stmt | typedef_stmt | grouping_stmt| data_def_stmt)* RIGHT_CURLY_BRACE;
+
+ /**
+ * key-stmt = key-keyword sep key-arg-str stmtend
+ */
+ key_stmt : KEY_KEYWORD string STMTEND;
+
+ /**
+ * unique-stmt = unique-keyword sep unique-arg-str stmtend
+ */
+ unique_stmt: UNIQUE_KEYWORD string STMTEND;
+
+ /**
+ * choice-stmt = choice-keyword sep identifier-arg-str optsep
+ * (";" /
+ * "{" stmtsep
+ * ;; these stmts can appear in any order
+ * [when-stmt stmtsep]
+ * *(if-feature-stmt stmtsep)
+ * [default-stmt stmtsep]
+ * [config-stmt stmtsep]
+ * [mandatory-stmt stmtsep]
+ * [status-stmt stmtsep]
+ * [description-stmt stmtsep]
+ * [reference-stmt stmtsep]
+ * *((short-case-stmt / case-stmt) stmtsep)
+ * "}")
+ * TODO : 0..1 occurance to be checked in listener
+ */
+ choice_stmt : CHOICE_KEYWORD IDENTIFIER (STMTEND | LEFT_CURLY_BRACE (when_stmt | if_feature_stmt | default_stmt
+ | config_stmt | mandatory_stmt | status_stmt | description_stmt | reference_stmt | short_case_stmt
+ | case_stmt)* RIGHT_CURLY_BRACE);
+
+ /**
+ * short-case-stmt = container-stmt /
+ * leaf-stmt /
+ * leaf-list-stmt /
+ * list-stmt /
+ * anyxml-stmt
+ */
+ short_case_stmt : container_stmt | leaf_stmt | leaf_list_stmt | list_stmt;
+
+ /**
+ * case-stmt = case-keyword sep identifier-arg-str optsep
+ * (";" /
+ * "{" stmtsep
+ * ;; these stmts can appear in any order
+ * [when-stmt stmtsep]
+ * *(if-feature-stmt stmtsep)
+ * [status-stmt stmtsep]
+ * [description-stmt stmtsep]
+ * [reference-stmt stmtsep]
+ * *(data-def-stmt stmtsep)
+ * "}")
+ * TODO : 0..1 occurance to be checked in listener
+ */
+ case_stmt : CASE_KEYWORD IDENTIFIER (STMTEND | LEFT_CURLY_BRACE (when_stmt | if_feature_stmt | status_stmt
+ | description_stmt | reference_stmt | data_def_stmt)* RIGHT_CURLY_BRACE);
+
+ /**
+ * uses-stmt = uses-keyword sep identifier-ref-arg-str optsep
+ * (";" /
+ * "{" stmtsep
+ * ;; these stmts can appear in any order
+ * [when-stmt stmtsep]
+ * *(if-feature-stmt stmtsep)
+ * [status-stmt stmtsep]
+ * [description-stmt stmtsep]
+ * [reference-stmt stmtsep]
+ * *(refine-stmt stmtsep)
+ * *(uses-augment-stmt stmtsep)
+ * "}")
+ * TODO : 0..1 occurance to be checked in listener
+ */
+ uses_stmt : USES_KEYWORD string (STMTEND | LEFT_CURLY_BRACE (when_stmt | if_feature_stmt | status_stmt
+ | description_stmt | reference_stmt | refine_stmt | uses_augment_stmt)* RIGHT_CURLY_BRACE);
+
+ /**
+ * refine-stmt = refine-keyword sep refine-arg-str optsep
+ * (";" /
+ * "{" stmtsep
+ * (refine-container-stmts /
+ * refine-leaf-stmts /
+ * refine-leaf-list-stmts /
+ * refine-list-stmts /
+ * refine-choice-stmts /
+ * refine-case-stmts /
+ * refine-anyxml-stmts)
+ * "}")
+ */
+ refine_stmt : REFINE_KEYWORD string (STMTEND | LEFT_CURLY_BRACE (refine_container_stmts | refine_leaf_stmts
+ | refine_leaf_list_stmts | refine_list_stmts | refine_choice_stmts | refine_case_stmts)
+ RIGHT_CURLY_BRACE);
+
+ /**
+ * refine-container-stmts =
+ * ;; these stmts can appear in any order
+ * *(must-stmt stmtsep)
+ * [presence-stmt stmtsep]
+ * [config-stmt stmtsep]
+ * [description-stmt stmtsep]
+ * [reference-stmt stmtsep]
+ * TODO : 0..1 occurance to be checked in listener
+ */
+ refine_container_stmts : (must_stmt | presence_stmt | config_stmt | description_stmt | reference_stmt)* ;
+
+ /**
+ * refine-leaf-stmts = ;; these stmts can appear in any order
+ * *(must-stmt stmtsep)
+ * [default-stmt stmtsep]
+ * [config-stmt stmtsep]
+ * [mandatory-stmt stmtsep]
+ * [description-stmt stmtsep]
+ * [reference-stmt stmtsep]
+ * TODO : 0..1 occurance to be checked in listener
+ */
+ refine_leaf_stmts : (must_stmt | default_stmt | config_stmt | mandatory_stmt | description_stmt | reference_stmt)*;
+
+ /**
+ * refine-leaf-list-stmts =
+ * ;; these stmts can appear in any order
+ * *(must-stmt stmtsep)
+ * [config-stmt stmtsep]
+ * [min-elements-stmt stmtsep]
+ * [max-elements-stmt stmtsep]
+ * [description-stmt stmtsep]
+ * [reference-stmt stmtsep]
+ * TODO : 0..1 occurance to be checked in listener
+ */
+ refine_leaf_list_stmts : (must_stmt | config_stmt | min_elements_stmt | max_elements_stmt | description_stmt
+ | reference_stmt)*;
+
+ /**
+ * refine-list-stmts = ;; these stmts can appear in any order
+ * *(must-stmt stmtsep)
+ * [config-stmt stmtsep]
+ * [min-elements-stmt stmtsep]
+ * [max-elements-stmt stmtsep]
+ * [description-stmt stmtsep]
+ * [reference-stmt stmtsep]
+ * TODO : 0..1 occurance to be checked in listener
+ */
+ refine_list_stmts : (must_stmt | config_stmt | min_elements_stmt | max_elements_stmt | description_stmt
+ | reference_stmt)*;
+
+ /**
+ * refine-choice-stmts = ;; these stmts can appear in any order
+ * [default-stmt stmtsep]
+ * [config-stmt stmtsep]
+ * [mandatory-stmt stmtsep]
+ * [description-stmt stmtsep]
+ * [reference-stmt stmtsep]
+ * TODO : 0..1 occurance to be checked in listener
+ */
+ refine_choice_stmts : (default_stmt | config_stmt | mandatory_stmt | description_stmt | reference_stmt)*;
+
+ /**
+ * refine-case-stmts = ;; these stmts can appear in any order
+ * [description-stmt stmtsep]
+ * [reference-stmt stmtsep]
+ *
+ */
+ refine_case_stmts : (description_stmt | reference_stmt)? | (reference_stmt | description_stmt)?;
+
+ /**
+ * uses-augment-stmt = augment-keyword sep uses-augment-arg-str optsep
+ * "{" stmtsep
+ * ;; these stmts can appear in any order
+ * [when-stmt stmtsep]
+ * *(if-feature-stmt stmtsep)
+ * [status-stmt stmtsep]
+ * [description-stmt stmtsep]
+ * [reference-stmt stmtsep]
+ * 1*((data-def-stmt stmtsep) /
+ * (case-stmt stmtsep))
+ * "}"
+ * TODO : 0..1 occurance to be checked in listener
+ */
+ uses_augment_stmt : AUGMENT_KEYWORD string LEFT_CURLY_BRACE (when_stmt | if_feature_stmt | status_stmt
+ | description_stmt | reference_stmt | data_def_stmt | case_stmt)* RIGHT_CURLY_BRACE;
+
+ /**
+ * augment-stmt = augment-keyword sep augment-arg-str optsep
+ * "{" stmtsep
+ * ;; these stmts can appear in any order
+ * [when-stmt stmtsep]
+ * *(if-feature-stmt stmtsep)
+ * [status-stmt stmtsep]
+ * [description-stmt stmtsep]
+ * [reference-stmt stmtsep]
+ * 1*((data-def-stmt stmtsep) /
+ * (case-stmt stmtsep))
+ * "}"
+ * TODO : 0..1 occurance to be checked in listener
+ */
+ augment_stmt : AUGMENT_KEYWORD string LEFT_CURLY_BRACE (when_stmt | if_feature_stmt | status_stmt
+ | description_stmt | reference_stmt | data_def_stmt | case_stmt)* RIGHT_CURLY_BRACE;
+
+ /**
+ * when-stmt = when-keyword sep string optsep
+ * (";" /
+ * "{" stmtsep
+ * ;; these stmts can appear in any order
+ * [description-stmt stmtsep]
+ * [reference-stmt stmtsep]
+ * "}")
+ *
+ */
+ when_stmt : WHEN_KEYWORD string (STMTEND | LEFT_CURLY_BRACE ((description_stmt? reference_stmt?)
+ | (reference_stmt? description_stmt?)) RIGHT_CURLY_BRACE);
+
+ /**
+ * rpc-stmt = rpc-keyword sep identifier-arg-str optsep
+ * (";" /
+ * "{" stmtsep
+ * ;; these stmts can appear in any order
+ * *(if-feature-stmt stmtsep)
+ * [status-stmt stmtsep]
+ * [description-stmt stmtsep]
+ * [reference-stmt stmtsep]
+ * *((typedef-stmt /
+ * grouping-stmt) stmtsep)
+ * [input-stmt stmtsep]
+ * [output-stmt stmtsep]
+ * "}")
+ * TODO : 0..1 occurance to be checked in listener
+ */
+ rpc_stmt : RPC_KEYWORD IDENTIFIER (STMTEND | LEFT_CURLY_BRACE (if_feature_stmt | status_stmt | description_stmt
+ | reference_stmt | typedef_stmt | grouping_stmt | input_stmt | output_stmt)* RIGHT_CURLY_BRACE);
+
+ /**
+ * input-stmt = input-keyword optsep
+ * "{" stmtsep
+ * ;; these stmts can appear in any order
+ * *((typedef-stmt /
+ * grouping-stmt) stmtsep)
+ * 1*(data-def-stmt stmtsep)
+ * "}"
+ */
+ input_stmt : INPUT_KEYWORD LEFT_CURLY_BRACE
+ ((typedef_stmt | grouping_stmt)* | data_def_stmt+)
+ | (data_def_stmt+ | (typedef_stmt | grouping_stmt)*)RIGHT_CURLY_BRACE;
+
+ /**
+ * output-stmt = output-keyword optsep
+ * "{" stmtsep
+ * ;; these stmts can appear in any order
+ * *((typedef-stmt /
+ * grouping-stmt) stmtsep)
+ * 1*(data-def-stmt stmtsep)
+ * "}"
+ */
+ output_stmt : OUTPUT_KEYWORD LEFT_CURLY_BRACE
+ ((typedef_stmt | grouping_stmt)* | data_def_stmt+)
+ | (data_def_stmt+ | (typedef_stmt | grouping_stmt)*)RIGHT_CURLY_BRACE;
+
+ /**
+ * notification-stmt = notification-keyword sep
+ * identifier-arg-str optsep
+ * (";" /
+ * "{" stmtsep
+ * ;; these stmts can appear in any order
+ * *(if-feature-stmt stmtsep)
+ * [status-stmt stmtsep]
+ * [description-stmt stmtsep]
+ * [reference-stmt stmtsep]
+ * *((typedef-stmt /
+ * grouping-stmt) stmtsep)
+ * *(data-def-stmt stmtsep)
+ * "}")
+ * TODO : 0..1 occurance to be checked in listener
+ */
+ notification_stmt : NOTIFICATION_KEYWORD IDENTIFIER (STMTEND | LEFT_CURLY_BRACE (if_feature_stmt | status_stmt
+ | description_stmt | reference_stmt | typedef_stmt | grouping_stmt | data_def_stmt)*
+ RIGHT_CURLY_BRACE);
+
+ /**
+ * deviation-stmt = deviation-keyword sep
+ * deviation-arg-str optsep
+ * "{" stmtsep
+ * ;; these stmts can appear in any order
+ * [description-stmt stmtsep]
+ * [reference-stmt stmtsep]
+ * (deviate-not-supported-stmt /
+ * 1*(deviate-add-stmt /
+ * deviate-replace-stmt /
+ * deviate-delete-stmt))
+ * "}"
+ * TODO : 0..1 occurance to be checked in listener
+ */
+ deviation_stmt: DEVIATION_KEYWORD string LEFT_CURLY_BRACE (description_stmt | reference_stmt
+ | deviate_not_supported_stmt | deviate_add_stmt | deviate_replace_stmt | deviate_delete_stmt)*
+ RIGHT_CURLY_BRACE;
+
+ /**
+ * deviate-not-supported-stmt =
+ * deviate-keyword sep
+ * not-supported-keyword optsep
+ * (";" /
+ * "{" stmtsep
+ * "}")
+ */
+ deviate_not_supported_stmt: DEVIATE_KEYWORD NOT_SUPPORTED_KEYWORD (STMTEND | LEFT_CURLY_BRACE RIGHT_CURLY_BRACE);
+
+ /**
+ * deviate-add-stmt = deviate-keyword sep add-keyword optsep
+ * (";" /
+ * "{" stmtsep
+ * [units-stmt stmtsep]
+ * *(must-stmt stmtsep)
+ * *(unique-stmt stmtsep)
+ * [default-stmt stmtsep]
+ * [config-stmt stmtsep]
+ * [mandatory-stmt stmtsep]
+ * [min-elements-stmt stmtsep]
+ * [max-elements-stmt stmtsep]
+ * "}")
+ */
+ deviate_add_stmt: DEVIATE_KEYWORD ADD_KEYWORD (STMTEND | (LEFT_CURLY_BRACE units_stmt? must_stmt* unique_stmt*
+ default_stmt? config_stmt? mandatory_stmt? min_elements_stmt? max_elements_stmt?
+ RIGHT_CURLY_BRACE));
+
+ /**
+ * deviate-delete-stmt = deviate-keyword sep delete-keyword optsep
+ * (";" /
+ * "{" stmtsep
+ * [units-stmt stmtsep]
+ * *(must-stmt stmtsep)
+ * *(unique-stmt stmtsep)
+ * [default-stmt stmtsep]
+ * "}")
+ */
+ deviate_delete_stmt: DEVIATE_KEYWORD DELETE_KEYWORD (STMTEND
+ | (LEFT_CURLY_BRACE units_stmt? must_stmt* unique_stmt* default_stmt? RIGHT_CURLY_BRACE));
+
+ /**
+ * deviate-replace-stmt = deviate-keyword sep replace-keyword optsep
+ * (";" /
+ * "{" stmtsep
+ * [type-stmt stmtsep]
+ * [units-stmt stmtsep]
+ * [default-stmt stmtsep]
+ * [config-stmt stmtsep]
+ * [mandatory-stmt stmtsep]
+ * [min-elements-stmt stmtsep]
+ * [max-elements-stmt stmtsep]
+ * "}")
+ */
+ deviate_replace_stmt: DEVIATE_KEYWORD REPLACE_KEYWORD (STMTEND | (LEFT_CURLY_BRACE type_stmt? units_stmt?
+ default_stmt? config_stmt? mandatory_stmt? min_elements_stmt?
+ max_elements_stmt? RIGHT_CURLY_BRACE));
+
+ string : STRING (PLUS STRING)*;
+
diff --git a/utils/yangutils/src/main/resources/YangLexer.g4 b/utils/yangutils/src/main/resources/YangLexer.g4
new file mode 100644
index 0000000..12bb19b
--- /dev/null
+++ b/utils/yangutils/src/main/resources/YangLexer.g4
@@ -0,0 +1,137 @@
+/*
+ * Copyright 2016 Open Networking Laboratory
+ *
+ * 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.
+ */
+
+/**
+ * This is a YANG grammar for lexer based on which ANTLR will generate YANG lexer.
+ */
+
+lexer grammar YangLexer;
+
+ // Statements keywords
+ ANYXML_KEYWORD : 'anyxml';
+ ARGUMENT_KEYWORD : 'argument';
+ AUGMENT_KEYWORD : 'augment';
+ BASE_KEYWORD : 'base';
+ BELONGS_TO_KEYWORD : 'belongs-to';
+ BIT_KEYWORD : 'bit';
+ CASE_KEYWORD : 'case';
+ CHOICE_KEYWORD : 'choice';
+ CONFIG_KEYWORD : 'config';
+ CONTACT_KEYWORD : 'contact';
+ CONTAINER_KEYWORD : 'container';
+ DEFAULT_KEYWORD : 'default';
+ DESCRIPTION_KEYWORD : 'description';
+ ENUM_KEYWORD : 'enum';
+ ERROR_APP_TAG_KEYWORD : 'error-app-tag';
+ ERROR_MESSAGE_KEYWORD : 'error-message';
+ EXTENSION_KEYWORD : 'extension';
+ DEVIATION_KEYWORD : 'deviation';
+ DEVIATE_KEYWORD : 'deviate';
+ FEATURE_KEYWORD : 'feature';
+ FRACTION_DIGITS_KEYWORD : 'fraction-digits';
+ GROUPING_KEYWORD : 'grouping';
+ IDENTITY_KEYWORD : 'identity';
+ IF_FEATURE_KEYWORD : 'if-feature';
+ IMPORT_KEYWORD : 'import';
+ INCLUDE_KEYWORD : 'include';
+ INPUT_KEYWORD : 'input';
+ KEY_KEYWORD : 'key';
+ LEAF_KEYWORD : 'leaf';
+ LEAF_LIST_KEYWORD : 'leaf-list';
+ LENGTH_KEYWORD : 'length';
+ LIST_KEYWORD : 'list';
+ MANDATORY_KEYWORD : 'mandatory';
+ MAX_ELEMENTS_KEYWORD : 'max-elements';
+ MIN_ELEMENTS_KEYWORD : 'min-elements';
+ MODULE_KEYWORD : 'module';
+ MUST_KEYWORD : 'must';
+ NAMESPACE_KEYWORD : 'namespace';
+ NOTIFICATION_KEYWORD: 'notification';
+ ORDERED_BY_KEYWORD : 'ordered-by';
+ ORGANIZATION_KEYWORD: 'organization';
+ OUTPUT_KEYWORD : 'output';
+ PATH_KEYWORD : 'path';
+ PATTERN_KEYWORD : 'pattern';
+ POSITION_KEYWORD : 'position';
+ PREFIX_KEYWORD : 'prefix';
+ PRESENCE_KEYWORD : 'presence';
+ RANGE_KEYWORD : 'range';
+ REFERENCE_KEYWORD : 'reference';
+ REFINE_KEYWORD : 'refine';
+ REQUIRE_INSTANCE_KEYWORD : 'require-instance';
+ REVISION_KEYWORD : 'revision';
+ REVISION_DATE_KEYWORD : 'revision-date';
+ RPC_KEYWORD : 'rpc';
+ STATUS_KEYWORD : 'status';
+ SUBMODULE_KEYWORD : 'submodule';
+ TYPE_KEYWORD : 'type';
+ TYPEDEF_KEYWORD : 'typedef';
+ UNIQUE_KEYWORD : 'unique';
+ UNITS_KEYWORD : 'units';
+ USES_KEYWORD : 'uses';
+ VALUE_KEYWORD : 'value';
+ WHEN_KEYWORD : 'when';
+ YANG_VERSION_KEYWORD: 'yang-version';
+ YIN_ELEMENT_KEYWORD : 'yin-element';
+ ADD_KEYWORD : 'add';
+ CURRENT_KEYWORD : 'current';
+ DELETE_KEYWORD : 'delete';
+ DEPRECATED_KEYWORD : 'deprecated';
+ FALSE_KEYWORD : 'false';
+ MAX_KEYWORD : 'max';
+ MIN_KEYWORD : 'min';
+ NOT_SUPPORTED_KEYWORD : 'not-supported';
+ OBSOLETE_KEYWORD : 'obsolete';
+ REPLACE_KEYWORD : 'replace';
+ SYSTEM_KEYWORD : 'system';
+ TRUE_KEYWORD : 'true';
+ UNBOUNDED_KEYWORD : 'unbounded';
+ USER_KEYWORD : 'user';
+
+ // Lexer tokens to be skipped
+ COMMENT
+ : '/*' .*? '*/' -> channel(HIDDEN)
+ ;
+ WS : [ \r\t\u000C\n]+ -> channel(HIDDEN)
+ ;
+ LINE_COMMENT
+ : '//' ~[\r\n]* '\r'? '\n' -> channel(HIDDEN)
+ ;
+
+ // Additional rules
+ INTEGER : DIGIT+;
+ DATE_ARG : DIGIT DIGIT DIGIT DIGIT '-' DIGIT DIGIT '-' DIGIT DIGIT;
+ LEFT_CURLY_BRACE : '{';
+ RIGHT_CURLY_BRACE : '}';
+ IDENTIFIER : (ALPHA | '_')
+ (ALPHA | DIGIT | '_' | '-' | '.')*;
+ STMTEND : ';';
+ DQUOTE : '"';
+ COLON : ':';
+ PLUS : '+';
+ MINUS: '-';
+
+ STRING : ((~( '\r' | '\n' | '\t' | ' ' | ';' | '{' | '"' | '\'')~( '\r' | '\n' | '\t' | ' ' | ';' | '{' )* ) | SUB_STRING );
+
+ //Fragment rules
+ fragment SUB_STRING : ('"' (ESC | ~["])*'"') | ('\'' (ESC | ~['])*'\'') ;
+ fragment ESC : '\\' (["\\/bfnrt] | UNICODE) ;
+ fragment UNICODE : 'u' HEX HEX HEX HEX ;
+ fragment HEX : [0-9a-fA-F] ;
+ fragment ALPHA : [A-Za-z];
+ fragment DIGIT : [0-9];
+ fragment URN : [u][r][n];
+ fragment HTTP : [h][t][t][p];
\ No newline at end of file