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Scala.g4
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/*
[The "BSD licence"]
Copyright (c) 2014 Leonardo Lucena
Copyright (c) 2018 Andrey Stolyarov
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. The name of the author may not be used to endorse or promote products
derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
Derived from https://github.com/scala/scala/blob/2.12.x/spec/13-syntax-summary.md
*/
// $antlr-format alignTrailingComments true, columnLimit 150, minEmptyLines 1, maxEmptyLinesToKeep 1, reflowComments false, useTab false
// $antlr-format allowShortRulesOnASingleLine false, allowShortBlocksOnASingleLine true, alignSemicolons hanging, alignColons hanging
grammar Scala;
literal
: '-'? IntegerLiteral
| '-'? FloatingPointLiteral
| BooleanLiteral
| CharacterLiteral
| StringLiteral
| SymbolLiteral
| 'null'
;
qualId
: Id ('.' Id)*
;
ids
: Id (',' Id)*
;
stableId
: Id
| stableId '.' Id
| (Id '.')? ('this' | 'super' classQualifier? '.' Id)
;
classQualifier
: '[' Id ']'
;
type_
: functionArgTypes '=>' type_
| infixType existentialClause?
;
functionArgTypes
: infixType
| '(' (paramType (',' paramType)*)? ')'
;
existentialClause
: 'forSome' '{' existentialDcl+ '}'
;
existentialDcl
: 'type' typeDcl
| 'val' valDcl
;
infixType
: compoundType (Id compoundType)*
;
compoundType
: annotType ('with' annotType)* refinement?
| refinement
;
annotType
: simpleType annotation*
;
simpleType
: simpleType typeArgs
| simpleType '#' Id
| stableId ('.' 'type')?
| '(' types ')'
;
typeArgs
: '[' types ']'
;
types
: type_ (',' type_)*
;
refinement
: NL? '{' refineStat+ '}'
;
refineStat
: dcl
| 'type' typeDef
;
typePat
: type_
;
ascription
: ':' infixType
| ':' annotation+
| ':' '_' '*'
;
expr
: (bindings | 'implicit'? Id | '_') '=>' expr
| expr1
;
expr1
: 'if' '(' expr ')' NL* expr ('else' expr)?
| 'while' '(' expr ')' NL* expr
| 'try' expr ('catch' expr)? ('finally' expr)?
| 'do' expr 'while' '(' expr ')'
| 'for' ('(' enumerators ')' | '{' enumerators '}') 'yield'? expr
| 'throw' expr
| 'return' expr?
| ((simpleExpr | simpleExpr1 '_'?) '.')? Id '=' expr
| simpleExpr1 argumentExprs '=' expr
| postfixExpr ascription?
| postfixExpr 'match' '{' caseClauses '}'
;
prefixDef
: '-'
| '+'
| '~'
| '!'
;
postfixExpr
: infixExpr Id? (prefixDef simpleExpr1)* NL?
;
infixExpr
: prefixExpr
| infixExpr Id NL? infixExpr
;
prefixExpr
: prefixDef? (simpleExpr | simpleExpr1 '_'?)
;
simpleExpr
: 'new' (classTemplate | templateBody)
| blockExpr
;
// Dublicate lines to prevent left-recursive code.
// can't use (simpleExpr|simpleExpr1) '.' Id
simpleExpr1
: literal
| stableId
| '_'
| '(' exprs? ')'
| simpleExpr '.' Id
| simpleExpr1 '_'? '.' Id
| simpleExpr typeArgs
| simpleExpr1 '_'? typeArgs
| simpleExpr1 argumentExprs
;
exprs
: expr (',' expr)*
;
argumentExprs
: '(' args ')'
| '{' args '}'
| NL? blockExpr
;
args
: exprs?
| (exprs ',')? postfixExpr (':' | '_' | '*')?
;
blockExpr
: '{' caseClauses '}'
| '{' block '}'
;
block
: blockStat+ resultExpr?
;
blockStat
: import_
| annotation* ('implicit' | 'lazy')? def_
| annotation* localModifier* tmplDef
| expr1
;
resultExpr
: expr1
| (bindings | ('implicit'? Id | '_') ':' compoundType) '=>' block
;
enumerators
: generator+
;
generator
: pattern1 '<-' expr (guard_ | pattern1 '=' expr)*
;
caseClauses
: caseClause+
;
caseClause
: 'case' pattern guard_? '=>' block
;
guard_
: 'if' postfixExpr
;
pattern
: pattern1 ('|' pattern1)*
;
pattern1
: (BoundVarid | '_' | Id) ':' typePat
| pattern2
;
pattern2
: Id ('@' pattern3)?
| pattern3
;
pattern3
: simplePattern
| simplePattern (Id NL? simplePattern)*
;
simplePattern
: '_'
| Varid
| literal
| stableId ('(' patterns? ')')?
| stableId '(' (patterns ',')? (Id '@')? '_' '*' ')'
| '(' patterns? ')'
;
patterns
: pattern (',' patterns)?
| '_' '*'
;
typeParamClause
: '[' variantTypeParam (',' variantTypeParam)* ']'
;
funTypeParamClause
: '[' typeParam (',' typeParam)* ']'
;
variantTypeParam
: annotation* ('+' | '-')? typeParam
;
typeParam
: (Id | '_') typeParamClause? ('>:' type_)? ('<:' type_)? ('<%' type_)* (':' type_)*
;
paramClauses
: paramClause* (NL? '(' 'implicit' params ')')?
;
paramClause
: NL? '(' params? ')'
;
params
: param (',' param)*
;
param
: annotation* Id (':' paramType)? ('=' expr)?
;
paramType
: type_
| '=>' type_
| type_ '*'
;
classParamClauses
: classParamClause* (NL? '(' 'implicit' classParams ')')?
;
classParamClause
: NL? '(' classParams? ')'
;
classParams
: classParam (',' classParam)*
;
classParam
: annotation* modifier* ('val' | 'var')? Id ':' paramType ('=' expr)?
;
bindings
: '(' binding (',' binding)* ')'
;
binding
: (Id | '_') (':' type_)?
;
modifier
: localModifier
| accessModifier
| 'override'
;
localModifier
: 'abstract'
| 'final'
| 'sealed'
| 'implicit'
| 'lazy'
;
accessModifier
: ('private' | 'protected') accessQualifier?
;
accessQualifier
: '[' (Id | 'this') ']'
;
annotation
: '@' simpleType argumentExprs*
;
constrAnnotation
: '@' simpleType argumentExprs
;
templateBody
: NL? '{' selfType? templateStat+ '}'
;
templateStat
: import_
| (annotation NL?)* modifier* def_
| (annotation NL?)* modifier* dcl
| expr
;
selfType
: Id (':' type_)? '=>'
| 'this' ':' type_ '=>'
;
import_
: 'import' importExpr (',' importExpr)*
;
importExpr
: stableId ('.' (Id | '_' | importSelectors))?
;
importSelectors
: '{' (importSelector ',')* (importSelector | '_') '}'
;
importSelector
: Id ('=>' (Id | '_'))?
;
dcl
: 'val' valDcl
| 'var' varDcl
| 'def' funDcl
| 'type' NL* typeDcl
;
valDcl
: ids ':' type_
;
varDcl
: ids ':' type_
;
funDcl
: funSig (':' type_)?
;
funSig
: Id funTypeParamClause? paramClauses
;
typeDcl
: Id typeParamClause? ('>:' type_)? ('<:' type_)?
;
patVarDef
: 'val' patDef
| 'var' varDef
;
def_
: patVarDef
| 'def' funDef
| 'type' NL* typeDef
| tmplDef
;
patDef
: pattern2 (',' pattern2)* (':' type_)? '=' expr
;
varDef
: patDef
| ids ':' type_ '=' '_'
;
funDef
: funSig (':' type_)? '=' expr
| funSig NL? '{' block '}'
| 'this' paramClause paramClauses ('=' constrExpr | NL? constrBlock)
;
typeDef
: Id typeParamClause? '=' type_
;
tmplDef
: 'case'? 'class' classDef
| 'case'? 'object' objectDef
| 'trait' traitDef
;
classDef
: Id typeParamClause? constrAnnotation* accessModifier? classParamClauses classTemplateOpt
;
traitDef
: Id typeParamClause? traitTemplateOpt
;
objectDef
: Id classTemplateOpt
;
classTemplateOpt
: 'extends' classTemplate
| ('extends'? templateBody)?
;
traitTemplateOpt
: 'extends' traitTemplate
| ('extends'? templateBody)?
;
classTemplate
: earlyDefs? classParents templateBody?
;
traitTemplate
: earlyDefs? traitParents templateBody?
;
classParents
: constr ('with' annotType)*
;
traitParents
: annotType ('with' annotType)*
;
constr
: annotType argumentExprs*
;
earlyDefs
: '{' earlyDef+ '}' 'with'
;
earlyDef
: (annotation NL?)* modifier* patVarDef
;
constrExpr
: selfInvocation
| constrBlock
;
constrBlock
: '{' selfInvocation (blockStat)* '}'
;
selfInvocation
: 'this' argumentExprs+
;
topStatSeq
: topStat+
;
topStat
: (annotation NL?)* modifier* tmplDef
| import_
| packaging
| packageObject
;
packaging
: 'package' qualId NL? '{' topStatSeq '}'
;
packageObject
: 'package' 'object' objectDef
;
compilationUnit
: ('package' qualId)* topStatSeq
;
// Lexer
Id
: Plainid
| '`' (CharNoBackQuoteOrNewline | UnicodeEscape | CharEscapeSeq)+ '`'
;
BooleanLiteral
: 'true'
| 'false'
;
CharacterLiteral
: '\'' (PrintableChar | CharEscapeSeq) '\''
;
SymbolLiteral
: '\'' Plainid
;
IntegerLiteral
: (DecimalNumeral | HexNumeral) ('L' | 'l')?
;
StringLiteral
: '"' StringElement* '"'
| '"""' MultiLineChars '"""'
;
FloatingPointLiteral
: Digit+ '.' Digit+ ExponentPart? FloatType?
| '.' Digit+ ExponentPart? FloatType?
| Digit ExponentPart FloatType?
| Digit+ ExponentPart? FloatType
;
Varid
: Lower Idrest
;
BoundVarid
: Varid
| '`' Varid '`'
;
Paren
: '('
| ')'
| '['
| ']'
| '{'
| '}'
;
Delim
: '`'
| '\''
| '"'
| '.'
| ';'
| ','
;
Semi
: (';' | (NL)+) -> skip
;
NL
: '\n'
| '\r' '\n'?
;
// \u0020-\u0026 """ !"#$%"""
// \u0028-\u007E """()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~"""
fragment CharNoBackQuoteOrNewline
: [\u0020-\u0026\u0028-\u007E]
;
// fragments
fragment UnicodeEscape
: '\\' 'u' 'u'? HexDigit HexDigit HexDigit HexDigit
;
fragment WhiteSpace
: '\u0020'
| '\u0009'
| '\u000D'
| '\u000A'
;
fragment Opchar
: '!'
| '#'
| '%'
| '&'
| '*'
| '+'
| '-'
| ':'
| '<'
| '='
| '>'
| '?'
| '@'
| '\\'
| '^'
| '|'
| '~'
;
fragment Op
: '/'? Opchar+
;
fragment Idrest
: (Letter | Digit)* ('_' Op)?
;
fragment StringElement
: '\u0020'
| '\u0021'
| '\u0023' .. '\u007F'
| CharEscapeSeq
;
fragment MultiLineChars
: (StringElement | NL)*
;
fragment HexDigit
: '0' .. '9'
| 'A' .. 'F'
| 'a' .. 'f'
;
fragment FloatType
: 'F'
| 'f'
| 'D'
| 'd'
;
fragment Upper
: 'A' .. 'Z'
| '$'
| '_'
| UnicodeClass_LU
;
fragment Lower
: 'a' .. 'z'
| UnicodeClass_LL
;
fragment Letter
: Upper
| Lower
| UnicodeClass_LO
| UnicodeClass_LT // TODO Add category Nl
;
// and Unicode categories Lo, Lt, Nl
fragment ExponentPart
: ('E' | 'e') ('+' | '-')? Digit+
;
fragment PrintableChar
: '\u0020' .. '\u007F'
;
fragment PrintableCharExceptWhitespace
: '\u0021' .. '\u007F'
;
fragment CharEscapeSeq
: '\\' ('b' | 't' | 'n' | 'f' | 'r' | '"' | '\'' | '\\')
;
fragment DecimalNumeral
: '0'
| NonZeroDigit Digit*
;
fragment HexNumeral
: '0' 'x' HexDigit HexDigit+
;
fragment Digit
: '0'
| NonZeroDigit
;
fragment NonZeroDigit
: '1' .. '9'
;
fragment VaridFragment
: Varid
;
fragment Plainid
: Upper Idrest
| Lower Idrest
| Op
;
//
// Unicode categories
// https://github.com/antlr/grammars-v4/blob/master/stringtemplate/LexUnicode.g4
//
fragment UnicodeLetter
: UnicodeClass_LU
| UnicodeClass_LL
| UnicodeClass_LT
| UnicodeClass_LM
| UnicodeClass_LO
;
fragment UnicodeClass_LU
: '\u0041' ..'\u005a'
| '\u00c0' ..'\u00d6'
| '\u00d8' ..'\u00de'
| '\u0100' ..'\u0136'
| '\u0139' ..'\u0147'
| '\u014a' ..'\u0178'
| '\u0179' ..'\u017d'
| '\u0181' ..'\u0182'
| '\u0184' ..'\u0186'
| '\u0187' ..'\u0189'
| '\u018a' ..'\u018b'
| '\u018e' ..'\u0191'
| '\u0193' ..'\u0194'
| '\u0196' ..'\u0198'
| '\u019c' ..'\u019d'
| '\u019f' ..'\u01a0'
| '\u01a2' ..'\u01a6'
| '\u01a7' ..'\u01a9'
| '\u01ac' ..'\u01ae'
| '\u01af' ..'\u01b1'
| '\u01b2' ..'\u01b3'
| '\u01b5' ..'\u01b7'
| '\u01b8' ..'\u01bc'
| '\u01c4' ..'\u01cd'
| '\u01cf' ..'\u01db'
| '\u01de' ..'\u01ee'
| '\u01f1' ..'\u01f4'
| '\u01f6' ..'\u01f8'
| '\u01fa' ..'\u0232'
| '\u023a' ..'\u023b'
| '\u023d' ..'\u023e'
| '\u0241' ..'\u0243'
| '\u0244' ..'\u0246'
| '\u0248' ..'\u024e'
| '\u0370' ..'\u0372'
| '\u0376' ..'\u037f'
| '\u0386' ..'\u0388'
| '\u0389' ..'\u038a'
| '\u038c' ..'\u038e'
| '\u038f' ..'\u0391'
| '\u0392' ..'\u03a1'
| '\u03a3' ..'\u03ab'
| '\u03cf' ..'\u03d2'
| '\u03d3' ..'\u03d4'
| '\u03d8' ..'\u03ee'
| '\u03f4' ..'\u03f7'
| '\u03f9' ..'\u03fa'
| '\u03fd' ..'\u042f'
| '\u0460' ..'\u0480'
| '\u048a' ..'\u04c0'
| '\u04c1' ..'\u04cd'
| '\u04d0' ..'\u052e'
| '\u0531' ..'\u0556'
| '\u10a0' ..'\u10c5'
| '\u10c7' ..'\u10cd'
| '\u1e00' ..'\u1e94'
| '\u1e9e' ..'\u1efe'
| '\u1f08' ..'\u1f0f'
| '\u1f18' ..'\u1f1d'
| '\u1f28' ..'\u1f2f'
| '\u1f38' ..'\u1f3f'
| '\u1f48' ..'\u1f4d'
| '\u1f59' ..'\u1f5f'
| '\u1f68' ..'\u1f6f'
| '\u1fb8' ..'\u1fbb'
| '\u1fc8' ..'\u1fcb'
| '\u1fd8' ..'\u1fdb'
| '\u1fe8' ..'\u1fec'
| '\u1ff8' ..'\u1ffb'
| '\u2102' ..'\u2107'
| '\u210b' ..'\u210d'
| '\u2110' ..'\u2112'
| '\u2115' ..'\u2119'
| '\u211a' ..'\u211d'
| '\u2124' ..'\u212a'
| '\u212b' ..'\u212d'
| '\u2130' ..'\u2133'
| '\u213e' ..'\u213f'
| '\u2145' ..'\u2183'
| '\u2c00' ..'\u2c2e'
| '\u2c60' ..'\u2c62'
| '\u2c63' ..'\u2c64'
| '\u2c67' ..'\u2c6d'
| '\u2c6e' ..'\u2c70'
| '\u2c72' ..'\u2c75'
| '\u2c7e' ..'\u2c80'
| '\u2c82' ..'\u2ce2'
| '\u2ceb' ..'\u2ced'
| '\u2cf2' ..'\ua640'
| '\ua642' ..'\ua66c'
| '\ua680' ..'\ua69a'
| '\ua722' ..'\ua72e'
| '\ua732' ..'\ua76e'
| '\ua779' ..'\ua77d'
| '\ua77e' ..'\ua786'
| '\ua78b' ..'\ua78d'
| '\ua790' ..'\ua792'
| '\ua796' ..'\ua7aa'
| '\ua7ab' ..'\ua7ad'
| '\ua7b0' ..'\ua7b1'
| '\uff21' ..'\uff3a'
;
fragment UnicodeClass_LL
: '\u0061' ..'\u007A'
| '\u00b5' ..'\u00df'
| '\u00e0' ..'\u00f6'
| '\u00f8' ..'\u00ff'
| '\u0101' ..'\u0137'
| '\u0138' ..'\u0148'
| '\u0149' ..'\u0177'
| '\u017a' ..'\u017e'
| '\u017f' ..'\u0180'
| '\u0183' ..'\u0185'
| '\u0188' ..'\u018c'
| '\u018d' ..'\u0192'
| '\u0195' ..'\u0199'
| '\u019a' ..'\u019b'
| '\u019e' ..'\u01a1'
| '\u01a3' ..'\u01a5'
| '\u01a8' ..'\u01aa'
| '\u01ab' ..'\u01ad'
| '\u01b0' ..'\u01b4'
| '\u01b6' ..'\u01b9'
| '\u01ba' ..'\u01bd'
| '\u01be' ..'\u01bf'
| '\u01c6' ..'\u01cc'
| '\u01ce' ..'\u01dc'
| '\u01dd' ..'\u01ef'
| '\u01f0' ..'\u01f3'
| '\u01f5' ..'\u01f9'
| '\u01fb' ..'\u0233'
| '\u0234' ..'\u0239'
| '\u023c' ..'\u023f'
| '\u0240' ..'\u0242'
| '\u0247' ..'\u024f'
| '\u0250' ..'\u0293'
| '\u0295' ..'\u02af'
| '\u0371' ..'\u0373'
| '\u0377' ..'\u037b'
| '\u037c' ..'\u037d'
| '\u0390' ..'\u03ac'
| '\u03ad' ..'\u03ce'
| '\u03d0' ..'\u03d1'
| '\u03d5' ..'\u03d7'
| '\u03d9' ..'\u03ef'
| '\u03f0' ..'\u03f3'
| '\u03f5' ..'\u03fb'
| '\u03fc' ..'\u0430'
| '\u0431' ..'\u045f'
| '\u0461' ..'\u0481'
| '\u048b' ..'\u04bf'
| '\u04c2' ..'\u04ce'
| '\u04cf' ..'\u052f'
| '\u0561' ..'\u0587'
| '\u1d00' ..'\u1d2b'
| '\u1d6b' ..'\u1d77'
| '\u1d79' ..'\u1d9a'
| '\u1e01' ..'\u1e95'
| '\u1e96' ..'\u1e9d'
| '\u1e9f' ..'\u1eff'
| '\u1f00' ..'\u1f07'
| '\u1f10' ..'\u1f15'
| '\u1f20' ..'\u1f27'
| '\u1f30' ..'\u1f37'
| '\u1f40' ..'\u1f45'
| '\u1f50' ..'\u1f57'
| '\u1f60' ..'\u1f67'
| '\u1f70' ..'\u1f7d'
| '\u1f80' ..'\u1f87'
| '\u1f90' ..'\u1f97'
| '\u1fa0' ..'\u1fa7'
| '\u1fb0' ..'\u1fb4'
| '\u1fb6' ..'\u1fb7'
| '\u1fbe' ..'\u1fc2'
| '\u1fc3' ..'\u1fc4'
| '\u1fc6' ..'\u1fc7'
| '\u1fd0' ..'\u1fd3'
| '\u1fd6' ..'\u1fd7'
| '\u1fe0' ..'\u1fe7'
| '\u1ff2' ..'\u1ff4'
| '\u1ff6' ..'\u1ff7'
| '\u210a' ..'\u210e'
| '\u210f' ..'\u2113'
| '\u212f' ..'\u2139'
| '\u213c' ..'\u213d'
| '\u2146' ..'\u2149'
| '\u214e' ..'\u2184'
| '\u2c30' ..'\u2c5e'
| '\u2c61' ..'\u2c65'
| '\u2c66' ..'\u2c6c'
| '\u2c71' ..'\u2c73'
| '\u2c74' ..'\u2c76'
| '\u2c77' ..'\u2c7b'
| '\u2c81' ..'\u2ce3'
| '\u2ce4' ..'\u2cec'
| '\u2cee' ..'\u2cf3'
| '\u2d00' ..'\u2d25'
| '\u2d27' ..'\u2d2d'
| '\ua641' ..'\ua66d'
| '\ua681' ..'\ua69b'
| '\ua723' ..'\ua72f'
| '\ua730' ..'\ua731'
| '\ua733' ..'\ua771'
| '\ua772' ..'\ua778'
| '\ua77a' ..'\ua77c'
| '\ua77f' ..'\ua787'
| '\ua78c' ..'\ua78e'
| '\ua791' ..'\ua793'
| '\ua794' ..'\ua795'
| '\ua797' ..'\ua7a9'
| '\ua7fa' ..'\uab30'
| '\uab31' ..'\uab5a'
| '\uab64' ..'\uab65'
| '\ufb00' ..'\ufb06'
| '\ufb13' ..'\ufb17'
| '\uff41' ..'\uff5a'
;
fragment UnicodeClass_LT
: '\u01c5' ..'\u01cb'
| '\u01f2' ..'\u1f88'
| '\u1f89' ..'\u1f8f'
| '\u1f98' ..'\u1f9f'
| '\u1fa8' ..'\u1faf'
| '\u1fbc' ..'\u1fcc'