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Chapi is A common language meta information convertor, convert different languages to same meta-data model
/*
Copyright (c) 2010 The Rust Project Developers
Copyright (c) 2020-2022 Student Main
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
documentation files (the "Software"), to deal in the Software without restriction, including without limitation the
rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit
persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice (including the next paragraph) shall be included in all copies or
substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
// $antlr-format alignTrailingComments true, columnLimit 150, minEmptyLines 1, maxEmptyLinesToKeep 1, reflowComments false, useTab false
// $antlr-format allowShortRulesOnASingleLine false, allowShortBlocksOnASingleLine true, alignSemicolons hanging, alignColons hanging
parser grammar RustParser;
options
{
tokenVocab = RustLexer;
superClass = RustParserBase;
}
// entry point
// 4
crate
: innerAttribute* item* EOF
;
// 3
macroInvocation
: simplePath '!' delimTokenTree
;
delimTokenTree
: '(' tokenTree* ')'
| '[' tokenTree* ']'
| '{' tokenTree* '}'
;
tokenTree
: tokenTreeToken+
| delimTokenTree
;
tokenTreeToken
: macroIdentifierLikeToken
| macroLiteralToken
| macroPunctuationToken
| macroRepOp
| '$'
;
macroInvocationSemi
: simplePath '!' '(' tokenTree* ')' ';'
| simplePath '!' '[' tokenTree* ']' ';'
| simplePath '!' '{' tokenTree* '}'
;
// 3.1
macroRulesDefinition
: 'macro_rules' '!' identifier macroRulesDef
;
macroRulesDef
: '(' macroRules ')' ';'
| '[' macroRules ']' ';'
| '{' macroRules '}'
;
macroRules
: macroRule (';' macroRule)* ';'?
;
macroRule
: macroMatcher '=>' macroTranscriber
;
macroMatcher
: '(' macroMatch* ')'
| '[' macroMatch* ']'
| '{' macroMatch* '}'
;
macroMatch
: macroMatchToken+
| macroMatcher
| '$' (identifier | 'self') ':' macroFragSpec
| '$' '(' macroMatch+ ')' macroRepSep? macroRepOp
;
macroMatchToken
: macroIdentifierLikeToken
| macroLiteralToken
| macroPunctuationToken
| macroRepOp
;
macroFragSpec
: identifier // do validate here is wasting token
;
macroRepSep
: macroIdentifierLikeToken
| macroLiteralToken
| macroPunctuationToken
| '$'
;
macroRepOp
: '*'
| '+'
| '?'
;
macroTranscriber
: delimTokenTree
;
//configurationPredicate
// : configurationOption | configurationAll | configurationAny | configurationNot ; configurationOption: identifier (
// '=' (STRING_LITERAL | RAW_STRING_LITERAL))?; configurationAll: 'all' '(' configurationPredicateList? ')';
// configurationAny: 'any' '(' configurationPredicateList? ')'; configurationNot: 'not' '(' configurationPredicate ')';
//configurationPredicateList
// : configurationPredicate (',' configurationPredicate)* ','? ; cfgAttribute: 'cfg' '(' configurationPredicate ')';
// cfgAttrAttribute: 'cfg_attr' '(' configurationPredicate ',' cfgAttrs? ')'; cfgAttrs: attr (',' attr)* ','?;
// 6
item
: outerAttribute* (visItem | macroItem)
;
visItem
: visibility? (
module
| externCrate
| useDeclaration
| function_
| typeAlias
| struct_
| enumeration
| union_
| constantItem
| staticItem
| trait_
| implementation
| externBlock
)
;
macroItem
: macroInvocationSemi
| macroRulesDefinition
;
// 6.1
module
: 'unsafe'? 'mod' identifier (';' | '{' innerAttribute* item* '}')
;
// 6.2
externCrate
: 'extern' 'crate' crateRef asClause? ';'
;
crateRef
: identifier
| 'self'
;
asClause
: 'as' (identifier | '_')
;
// 6.3
useDeclaration
: 'use' useTree ';'
;
useTree
: (simplePath? '::')? ('*' | '{' ( useTree (',' useTree)* ','?)? '}')
| simplePath ('as' (identifier | '_'))?
;
// 6.4
function_
: functionQualifiers 'fn' identifier genericParams? '(' functionParameters? ')' functionReturnType? whereClause? (
blockExpression
| ';'
)
;
functionQualifiers
: 'const'? 'async'? 'unsafe'? ('extern' abi?)?
;
abi
: STRING_LITERAL
| RAW_STRING_LITERAL
;
functionParameters
: selfParam ','?
| (selfParam ',')? functionParam (',' functionParam)* ','?
;
selfParam
: outerAttribute* (shorthandSelf | typedSelf)
;
shorthandSelf
: ('&' lifetime?)? 'mut'? 'self'
;
typedSelf
: 'mut'? 'self' ':' type_
;
functionParam
: outerAttribute* (functionParamPattern | '...' | type_)
;
functionParamPattern
: pattern ':' (type_ | '...')
;
functionReturnType
: '->' type_
;
// 6.5
typeAlias
: 'type' identifier genericParams? whereClause? ('=' type_)? ';'
;
// 6.6
struct_
: structStruct
| tupleStruct
;
structStruct
: 'struct' identifier genericParams? whereClause? ('{' structFields? '}' | ';')
;
tupleStruct
: 'struct' identifier genericParams? '(' tupleFields? ')' whereClause? ';'
;
structFields
: structField (',' structField)* ','?
;
structField
: outerAttribute* visibility? identifier ':' type_
;
tupleFields
: tupleField (',' tupleField)* ','?
;
tupleField
: outerAttribute* visibility? type_
;
// 6.7
enumeration
: 'enum' identifier genericParams? whereClause? '{' enumItems? '}'
;
enumItems
: enumItem (',' enumItem)* ','?
;
enumItem
: outerAttribute* visibility? identifier (
enumItemTuple
| enumItemStruct
| enumItemDiscriminant
)?
;
enumItemTuple
: '(' tupleFields? ')'
;
enumItemStruct
: '{' structFields? '}'
;
enumItemDiscriminant
: '=' expression
;
// 6.8
union_
: 'union' identifier genericParams? whereClause? '{' structFields '}'
;
// 6.9
constantItem
: 'const' (identifier | '_') ':' type_ ('=' expression)? ';'
;
// 6.10
staticItem
: 'static' 'mut'? identifier ':' type_ ('=' expression)? ';'
;
// 6.11
trait_
: 'unsafe'? 'trait' identifier genericParams? (':' typeParamBounds?)? whereClause? '{' innerAttribute* associatedItem* '}'
;
// 6.12
implementation
: inherentImpl
| traitImpl
;
inherentImpl
: 'impl' genericParams? type_ whereClause? '{' innerAttribute* associatedItem* '}'
;
traitImpl
: 'unsafe'? 'impl' genericParams? '!'? typePath 'for' type_ whereClause? '{' innerAttribute* associatedItem* '}'
;
// 6.13
externBlock
: 'unsafe'? 'extern' abi? '{' innerAttribute* externalItem* '}'
;
externalItem
: outerAttribute* (macroInvocationSemi | visibility? ( staticItem | function_))
;
// 6.14
genericParams
: '<' ((genericParam ',')* genericParam ','?)? '>'
;
genericParam
: outerAttribute* (lifetimeParam | typeParam | constParam)
;
lifetimeParam
: outerAttribute? LIFETIME_OR_LABEL (':' lifetimeBounds)?
;
typeParam
: outerAttribute? identifier (':' typeParamBounds?)? ('=' type_)?
;
constParam
: 'const' identifier ':' type_
;
whereClause
: 'where' (whereClauseItem ',')* whereClauseItem?
;
whereClauseItem
: lifetimeWhereClauseItem
| typeBoundWhereClauseItem
;
lifetimeWhereClauseItem
: lifetime ':' lifetimeBounds
;
typeBoundWhereClauseItem
: forLifetimes? type_ ':' typeParamBounds?
;
forLifetimes
: 'for' genericParams
;
// 6.15
associatedItem
: outerAttribute* (macroInvocationSemi | visibility? ( typeAlias | constantItem | function_))
;
// 7
innerAttribute
: '#' '!' '[' attr ']'
;
outerAttribute
: '#' '[' attr ']'
;
attr
: simplePath attrInput?
;
attrInput
: delimTokenTree
| '=' literalExpression
; // w/o suffix
//metaItem
// : simplePath ( '=' literalExpression //w | '(' metaSeq ')' )? ; metaSeq: metaItemInner (',' metaItemInner)* ','?;
// metaItemInner: metaItem | literalExpression; // w
//metaWord: identifier; metaNameValueStr: identifier '=' ( STRING_LITERAL | RAW_STRING_LITERAL); metaListPaths:
// identifier '(' ( simplePath (',' simplePath)* ','?)? ')'; metaListIdents: identifier '(' ( identifier (','
// identifier)* ','?)? ')'; metaListNameValueStr : identifier '(' (metaNameValueStr ( ',' metaNameValueStr)* ','?)? ')'
// ;
// 8
statement
: ';'
| item
| letStatement
| expressionStatement
| macroInvocationSemi
;
letStatement
: outerAttribute* 'let' patternNoTopAlt (':' type_)? ('=' expression)? ';'
;
expressionStatement
: expression ';'
| expressionWithBlock ';'?
;
// 8.2
expression
: outerAttribute+ expression # AttributedExpression // technical, remove left recursive
| literalExpression # LiteralExpression_
| pathExpression # PathExpression_
| expression '.' pathExprSegment '(' callParams? ')' # MethodCallExpression // 8.2.10
| expression '.' identifier # FieldExpression // 8.2.11
| expression '.' tupleIndex # TupleIndexingExpression // 8.2.7
| expression '.' 'await' # AwaitExpression // 8.2.18
| expression '(' callParams? ')' # CallExpression // 8.2.9
| expression '[' expression ']' # IndexExpression // 8.2.6
| expression '?' # ErrorPropagationExpression // 8.2.4
| ('&' | '&&') 'mut'? expression # BorrowExpression // 8.2.4
| '*' expression # DereferenceExpression // 8.2.4
| ('-' | '!') expression # NegationExpression // 8.2.4
| expression 'as' typeNoBounds # TypeCastExpression // 8.2.4
| expression ('*' | '/' | '%') expression # ArithmeticOrLogicalExpression // 8.2.4
| expression ('+' | '-') expression # ArithmeticOrLogicalExpression // 8.2.4
| expression (shl | shr) expression # ArithmeticOrLogicalExpression // 8.2.4
| expression '&' expression # ArithmeticOrLogicalExpression // 8.2.4
| expression '^' expression # ArithmeticOrLogicalExpression // 8.2.4
| expression '|' expression # ArithmeticOrLogicalExpression // 8.2.4
| expression comparisonOperator expression # ComparisonExpression // 8.2.4
| expression '&&' expression # LazyBooleanExpression // 8.2.4
| expression '||' expression # LazyBooleanExpression // 8.2.4
| expression '..' expression? # RangeExpression // 8.2.14
| '..' expression? # RangeExpression // 8.2.14
| '..=' expression # RangeExpression // 8.2.14
| expression '..=' expression # RangeExpression // 8.2.14
| expression '=' expression # AssignmentExpression // 8.2.4
| expression compoundAssignOperator expression # CompoundAssignmentExpression // 8.2.4
| 'continue' LIFETIME_OR_LABEL? expression? # ContinueExpression // 8.2.13
| 'break' LIFETIME_OR_LABEL? expression? # BreakExpression // 8.2.13
| 'return' expression? # ReturnExpression // 8.2.17
| '(' innerAttribute* expression ')' # GroupedExpression // 8.2.5
| '[' innerAttribute* arrayElements? ']' # ArrayExpression // 8.2.6
| '(' innerAttribute* tupleElements? ')' # TupleExpression // 8.2.7
| structExpression # StructExpression_ // 8.2.8
| enumerationVariantExpression # EnumerationVariantExpression_
| closureExpression # ClosureExpression_ // 8.2.12
| expressionWithBlock # ExpressionWithBlock_
| macroInvocation # MacroInvocationAsExpression
;
comparisonOperator
: '=='
| '!='
| '>'
| '<'
| '>='
| '<='
;
compoundAssignOperator
: '+='
| '-='
| '*='
| '/='
| '%='
| '&='
| '|='
| '^='
| '<<='
| '>>='
;
expressionWithBlock
: outerAttribute+ expressionWithBlock // technical
| blockExpression
| asyncBlockExpression
| unsafeBlockExpression
| loopExpression
| ifExpression
| ifLetExpression
| matchExpression
;
// 8.2.1
literalExpression
: CHAR_LITERAL
| STRING_LITERAL
| RAW_STRING_LITERAL
| BYTE_LITERAL
| BYTE_STRING_LITERAL
| RAW_BYTE_STRING_LITERAL
| INTEGER_LITERAL
| FLOAT_LITERAL
| KW_TRUE
| KW_FALSE
;
// 8.2.2
pathExpression
: pathInExpression
| qualifiedPathInExpression
;
// 8.2.3
blockExpression
: '{' innerAttribute* statements? '}'
;
statements
: statement+ expression?
| expression
;
asyncBlockExpression
: 'async' 'move'? blockExpression
;
unsafeBlockExpression
: 'unsafe' blockExpression
;
// 8.2.6
arrayElements
: expression (',' expression)* ','?
| expression ';' expression
;
// 8.2.7
tupleElements
: (expression ',')+ expression?
;
tupleIndex
: INTEGER_LITERAL
;
// 8.2.8
structExpression
: structExprStruct
| structExprTuple
| structExprUnit
;
structExprStruct
: pathInExpression '{' innerAttribute* (structExprFields | structBase)? '}'
;
structExprFields
: structExprField (',' structExprField)* (',' structBase | ','?)
;
// outerAttribute here is not in doc
structExprField
: outerAttribute* (identifier | (identifier | tupleIndex) ':' expression)
;
structBase
: '..' expression
;
structExprTuple
: pathInExpression '(' innerAttribute* (expression ( ',' expression)* ','?)? ')'
;
structExprUnit
: pathInExpression
;
enumerationVariantExpression
: enumExprStruct
| enumExprTuple
| enumExprFieldless
;
enumExprStruct
: pathInExpression '{' enumExprFields? '}'
;
enumExprFields
: enumExprField (',' enumExprField)* ','?
;
enumExprField
: identifier
| (identifier | tupleIndex) ':' expression
;
enumExprTuple
: pathInExpression '(' (expression (',' expression)* ','?)? ')'
;
enumExprFieldless
: pathInExpression
;
// 8.2.9
callParams
: expression (',' expression)* ','?
;
// 8.2.12
closureExpression
: 'move'? ('||' | '|' closureParameters? '|') (expression | '->' typeNoBounds blockExpression)
;
closureParameters
: closureParam (',' closureParam)* ','?
;
closureParam
: outerAttribute* pattern (':' type_)?
;
// 8.2.13
loopExpression
: loopLabel? (
infiniteLoopExpression
| predicateLoopExpression
| predicatePatternLoopExpression
| iteratorLoopExpression
)
;
infiniteLoopExpression
: 'loop' blockExpression
;
predicateLoopExpression
: 'while' expression /*except structExpression*/ blockExpression
;
predicatePatternLoopExpression
: 'while' 'let' pattern '=' expression blockExpression
;
iteratorLoopExpression
: 'for' pattern 'in' expression blockExpression
;
loopLabel
: LIFETIME_OR_LABEL ':'
;
// 8.2.15
ifExpression
: 'if' expression blockExpression ('else' (blockExpression | ifExpression | ifLetExpression))?
;
ifLetExpression
: 'if' 'let' pattern '=' expression blockExpression (
'else' (blockExpression | ifExpression | ifLetExpression)
)?
;
// 8.2.16
matchExpression
: 'match' expression '{' innerAttribute* matchArms? '}'
;
matchArms
: (matchArm '=>' matchArmExpression)* matchArm '=>' expression ','?
;
matchArmExpression
: expression ','
| expressionWithBlock ','?
;
matchArm
: outerAttribute* pattern matchArmGuard?
;
matchArmGuard
: 'if' expression
;
// 9
pattern
: '|'? patternNoTopAlt ('|' patternNoTopAlt)*
;
patternNoTopAlt
: patternWithoutRange
| rangePattern
;
patternWithoutRange
: literalPattern
| identifierPattern
| wildcardPattern
| restPattern
| referencePattern
| structPattern
| tupleStructPattern
| tuplePattern
| groupedPattern
| slicePattern
| pathPattern
| macroInvocation
;
literalPattern
: KW_TRUE
| KW_FALSE
| CHAR_LITERAL
| BYTE_LITERAL
| STRING_LITERAL
| RAW_STRING_LITERAL
| BYTE_STRING_LITERAL
| RAW_BYTE_STRING_LITERAL
| '-'? INTEGER_LITERAL
| '-'? FLOAT_LITERAL
;
identifierPattern
: 'ref'? 'mut'? identifier ('@' pattern)?
;
wildcardPattern
: '_'
;
restPattern
: '..'
;
rangePattern
: rangePatternBound '..=' rangePatternBound # InclusiveRangePattern
| rangePatternBound '..' # HalfOpenRangePattern
| rangePatternBound '...' rangePatternBound # ObsoleteRangePattern
;
rangePatternBound
: CHAR_LITERAL
| BYTE_LITERAL
| '-'? INTEGER_LITERAL
| '-'? FLOAT_LITERAL
| pathPattern
;
referencePattern
: ('&' | '&&') 'mut'? patternWithoutRange
;
structPattern
: pathInExpression '{' structPatternElements? '}'
;
structPatternElements
: structPatternFields (',' structPatternEtCetera?)?
| structPatternEtCetera
;
structPatternFields
: structPatternField (',' structPatternField)*
;
structPatternField
: outerAttribute* (tupleIndex ':' pattern | identifier ':' pattern | 'ref'? 'mut'? identifier)
;
structPatternEtCetera
: outerAttribute* '..'
;
tupleStructPattern
: pathInExpression '(' tupleStructItems? ')'
;
tupleStructItems
: pattern (',' pattern)* ','?
;
tuplePattern
: '(' tuplePatternItems? ')'
;
tuplePatternItems
: pattern ','
| restPattern
| pattern (',' pattern)+ ','?
;
groupedPattern
: '(' pattern ')'
;
slicePattern
: '[' slicePatternItems? ']'
;
slicePatternItems
: pattern (',' pattern)* ','?
;
pathPattern
: pathInExpression
| qualifiedPathInExpression
;
// 10.1
type_
: typeNoBounds
| implTraitType
| traitObjectType
;
typeNoBounds
: parenthesizedType
| implTraitTypeOneBound
| traitObjectTypeOneBound
| typePath
| tupleType
| neverType
| rawPointerType
| referenceType
| arrayType
| sliceType
| inferredType
| qualifiedPathInType
| bareFunctionType
| macroInvocation
;
parenthesizedType
: '(' type_ ')'
;
// 10.1.4
neverType
: '!'
;
// 10.1.5
tupleType
: '(' ((type_ ',')+ type_?)? ')'
;
// 10.1.6
arrayType
: '[' type_ ';' expression ']'
;
// 10.1.7
sliceType
: '[' type_ ']'
;
// 10.1.13
referenceType
: '&' lifetime? 'mut'? typeNoBounds
;
rawPointerType
: '*' ('mut' | 'const') typeNoBounds
;
// 10.1.14
bareFunctionType
: forLifetimes? functionTypeQualifiers 'fn' '(' functionParametersMaybeNamedVariadic? ')' bareFunctionReturnType?
;
functionTypeQualifiers
: 'unsafe'? ('extern' abi?)?
;
bareFunctionReturnType
: '->' typeNoBounds
;
functionParametersMaybeNamedVariadic
: maybeNamedFunctionParameters
| maybeNamedFunctionParametersVariadic
;
maybeNamedFunctionParameters
: maybeNamedParam (',' maybeNamedParam)* ','?
;
maybeNamedParam
: outerAttribute* ((identifier | '_') ':')? type_
;
maybeNamedFunctionParametersVariadic
: (maybeNamedParam ',')* maybeNamedParam ',' outerAttribute* '...'
;
// 10.1.15
traitObjectType
: 'dyn'? typeParamBounds
;
traitObjectTypeOneBound
: 'dyn'? traitBound
;
implTraitType
: 'impl' typeParamBounds
;
implTraitTypeOneBound
: 'impl' traitBound
;
// 10.1.18
inferredType
: '_'
;
// 10.6
typeParamBounds
: typeParamBound ('+' typeParamBound)* '+'?
;
typeParamBound
: lifetime
| traitBound
;
traitBound
: '?'? forLifetimes? typePath
| '(' '?'? forLifetimes? typePath ')'
;
lifetimeBounds
: (lifetime '+')* lifetime?
;
lifetime
: LIFETIME_OR_LABEL
| '\'static'
| '\'_'
;
// 12.4
simplePath
: '::'? simplePathSegment ('::' simplePathSegment)*
;
simplePathSegment
: identifier
| 'super'
| 'self'
| 'crate'
| '$crate'
;
pathInExpression
: '::'? pathExprSegment ('::' pathExprSegment)*
;
pathExprSegment
: pathIdentSegment ('::' genericArgs)?
;
pathIdentSegment
: identifier
| 'super'
| 'self'
| 'Self'
| 'crate'
| '$crate'
;
//TODO: let x : T<_>=something;
genericArgs
: '<' '>'
| '<' genericArgsLifetimes (',' genericArgsTypes)? (',' genericArgsBindings)? ','? '>'
| '<' genericArgsTypes (',' genericArgsBindings)? ','? '>'
| '<' (genericArg ',')* genericArg ','? '>'
;
genericArg
: lifetime
| type_
| genericArgsConst
| genericArgsBinding
;
genericArgsConst
: blockExpression
| '-'? literalExpression
| simplePathSegment
;
genericArgsLifetimes
: lifetime (',' lifetime)*
;
genericArgsTypes
: type_ (',' type_)*
;
genericArgsBindings
: genericArgsBinding (',' genericArgsBinding)*
;
genericArgsBinding
: identifier '=' type_
;
qualifiedPathInExpression
: qualifiedPathType ('::' pathExprSegment)+
;
qualifiedPathType
: '<' type_ ('as' typePath)? '>'
;
qualifiedPathInType
: qualifiedPathType ('::' typePathSegment)+
;
typePath
: '::'? typePathSegment ('::' typePathSegment)*
;
typePathSegment
: pathIdentSegment '::'? (genericArgs | typePathFn)?
;
typePathFn
: '(' typePathInputs? ')' ('->' type_)?
;
typePathInputs
: type_ (',' type_)* ','?
;
// 12.6
visibility
: 'pub' ('(' ( 'crate' | 'self' | 'super' | 'in' simplePath) ')')?
;
// technical
identifier
: NON_KEYWORD_IDENTIFIER
| RAW_IDENTIFIER
| 'macro_rules'
;
keyword
: KW_AS
| KW_BREAK
| KW_CONST
| KW_CONTINUE
| KW_CRATE
| KW_ELSE
| KW_ENUM
| KW_EXTERN
| KW_FALSE
| KW_FN
| KW_FOR
| KW_IF
| KW_IMPL
| KW_IN
| KW_LET
| KW_LOOP
| KW_MATCH
| KW_MOD
| KW_MOVE
| KW_MUT
| KW_PUB
| KW_REF
| KW_RETURN
| KW_SELFVALUE
| KW_SELFTYPE
| KW_STATIC
| KW_STRUCT
| KW_SUPER
| KW_TRAIT
| KW_TRUE
| KW_TYPE
| KW_UNSAFE
| KW_USE
| KW_WHERE
| KW_WHILE
// 2018+
| KW_ASYNC
| KW_AWAIT
| KW_DYN
// reserved
| KW_ABSTRACT
| KW_BECOME
| KW_BOX
| KW_DO
| KW_FINAL
| KW_MACRO
| KW_OVERRIDE
| KW_PRIV
| KW_TYPEOF
| KW_UNSIZED
| KW_VIRTUAL
| KW_YIELD
| KW_TRY
| KW_UNION
| KW_STATICLIFETIME
;
macroIdentifierLikeToken
: keyword
| identifier
| KW_MACRORULES
| KW_UNDERLINELIFETIME
| KW_DOLLARCRATE
| LIFETIME_OR_LABEL
;
macroLiteralToken
: literalExpression
;
// macroDelimiterToken: '{' | '}' | '[' | ']' | '(' | ')';
macroPunctuationToken
: '-'
//| '+' | '*'
| '/'
| '%'
| '^'
| '!'
| '&'
| '|'
| '&&'
| '||'
// already covered by '<' and '>' in macro | shl | shr
| '+='
| '-='
| '*='
| '/='
| '%='
| '^='
| '&='
| '|='
| '<<='
| '>>='
| '='
| '=='
| '!='
| '>'
| '<'
| '>='
| '<='
| '@'
| '_'
| '.'
| '..'
| '...'
| '..='
| ','
| ';'
| ':'
| '::'
| '->'
| '=>'
| '#'
//| '$' | '?'
;
// LA can be removed, legal rust code still pass but the cost is `let c = a < < b` will pass... i hope antlr5 can add
// some new syntax? dsl? for these stuff so i needn't write it in (at least) 5 language
shl
: '<' {this.next('<')}? '<'
;
shr
: '>' {this.next('>')}? '>'
;