Root <- skip ContainerMembers eof
# *** Top level ***
ContainerMembers <- container_doc_comment? ContainerDeclaration* (ContainerField COMMA)* (ContainerField / ContainerDeclaration*)
ContainerDeclaration <- TestDecl / ComptimeDecl / doc_comment? KEYWORD_pub? Decl
TestDecl <- KEYWORD_test (STRINGLITERALSINGLE / IDENTIFIER)? Block
ComptimeDecl <- KEYWORD_comptime Block
Decl
<- (KEYWORD_export / KEYWORD_extern STRINGLITERALSINGLE? / KEYWORD_inline / KEYWORD_noinline)? FnProto (SEMICOLON / Block)
/ (KEYWORD_export / KEYWORD_extern STRINGLITERALSINGLE?)? KEYWORD_threadlocal? GlobalVarDecl
FnProto <- KEYWORD_fn IDENTIFIER? LPAREN ParamDeclList RPAREN ByteAlign? AddrSpace? LinkSection? CallConv? EXCLAMATIONMARK? TypeExpr
VarDeclProto <- (KEYWORD_const / KEYWORD_var) IDENTIFIER (COLON TypeExpr)? ByteAlign? AddrSpace? LinkSection?
GlobalVarDecl <- VarDeclProto (EQUAL Expr)? SEMICOLON
ContainerField <- doc_comment? KEYWORD_comptime? !KEYWORD_fn (IDENTIFIER COLON)? TypeExpr ByteAlign? (EQUAL Expr)?
# *** Block Level ***
Statement
<- KEYWORD_comptime ComptimeStatement
/ KEYWORD_nosuspend BlockExprStatement
/ KEYWORD_suspend BlockExprStatement
/ KEYWORD_defer BlockExprStatement
/ KEYWORD_errdefer Payload? BlockExprStatement
/ IfStatement
/ LabeledStatement
/ VarDeclExprStatement
ComptimeStatement
<- BlockExpr
/ VarDeclExprStatement
IfStatement
<- IfPrefix BlockExpr ( KEYWORD_else Payload? Statement )?
/ IfPrefix AssignExpr ( SEMICOLON / KEYWORD_else Payload? Statement )
LabeledStatement <- BlockLabel? (Block / LoopStatement / SwitchExpr)
LoopStatement <- KEYWORD_inline? (ForStatement / WhileStatement)
ForStatement
<- ForPrefix BlockExpr ( KEYWORD_else Statement )?
/ ForPrefix AssignExpr ( SEMICOLON / KEYWORD_else Statement )
WhileStatement
<- WhilePrefix BlockExpr ( KEYWORD_else Payload? Statement )?
/ WhilePrefix AssignExpr ( SEMICOLON / KEYWORD_else Payload? Statement )
BlockExprStatement
<- BlockExpr
/ AssignExpr SEMICOLON
BlockExpr <- BlockLabel? Block
# An expression, assignment, or any destructure, as a statement.
VarDeclExprStatement
<- VarDeclProto (COMMA (VarDeclProto / Expr))* EQUAL Expr SEMICOLON
/ Expr (AssignOp Expr / (COMMA (VarDeclProto / Expr))+ EQUAL Expr)? SEMICOLON
# *** Expression Level ***
# An assignment or a destructure whose LHS are all lvalue expressions.
AssignExpr <- Expr (AssignOp Expr / (COMMA Expr)+ EQUAL Expr)?
SingleAssignExpr <- Expr (AssignOp Expr)?
Expr <- BoolOrExpr
BoolOrExpr <- BoolAndExpr (KEYWORD_or BoolAndExpr)*
BoolAndExpr <- CompareExpr (KEYWORD_and CompareExpr)*
CompareExpr <- BitwiseExpr (CompareOp BitwiseExpr)?
BitwiseExpr <- BitShiftExpr (BitwiseOp BitShiftExpr)*
BitShiftExpr <- AdditionExpr (BitShiftOp AdditionExpr)*
AdditionExpr <- MultiplyExpr (AdditionOp MultiplyExpr)*
MultiplyExpr <- PrefixExpr (MultiplyOp PrefixExpr)*
PrefixExpr <- PrefixOp* PrimaryExpr
PrimaryExpr
<- AsmExpr
/ IfExpr
/ KEYWORD_break BreakLabel? Expr?
/ KEYWORD_comptime Expr
/ KEYWORD_nosuspend Expr
/ KEYWORD_continue BreakLabel? Expr?
/ KEYWORD_resume Expr
/ KEYWORD_return Expr?
/ BlockLabel? LoopExpr
/ Block
/ CurlySuffixExpr
IfExpr <- IfPrefix Expr (KEYWORD_else Payload? Expr)?
Block <- LBRACE Statement* RBRACE
LoopExpr <- KEYWORD_inline? (ForExpr / WhileExpr)
ForExpr <- ForPrefix Expr (KEYWORD_else Expr)?
WhileExpr <- WhilePrefix Expr (KEYWORD_else Payload? Expr)?
CurlySuffixExpr <- TypeExpr InitList?
InitList
<- LBRACE FieldInit (COMMA FieldInit)* COMMA? RBRACE
/ LBRACE Expr (COMMA Expr)* COMMA? RBRACE
/ LBRACE RBRACE
TypeExpr <- PrefixTypeOp* ErrorUnionExpr
ErrorUnionExpr <- SuffixExpr (EXCLAMATIONMARK TypeExpr)?
SuffixExpr
<- PrimaryTypeExpr (SuffixOp / FnCallArguments)*
PrimaryTypeExpr
<- BUILTINIDENTIFIER FnCallArguments
/ CHAR_LITERAL
/ ContainerDecl
/ DOT IDENTIFIER
/ DOT InitList
/ ErrorSetDecl
/ FLOAT
/ FnProto
/ GroupedExpr
/ LabeledTypeExpr
/ IDENTIFIER
/ IfTypeExpr
/ INTEGER
/ KEYWORD_comptime TypeExpr
/ KEYWORD_error DOT IDENTIFIER
/ KEYWORD_anyframe
/ KEYWORD_unreachable
/ STRINGLITERAL
ContainerDecl <- (KEYWORD_extern / KEYWORD_packed)? ContainerDeclAuto
ErrorSetDecl <- KEYWORD_error LBRACE IdentifierList RBRACE
GroupedExpr <- LPAREN Expr RPAREN
IfTypeExpr <- IfPrefix TypeExpr (KEYWORD_else Payload? TypeExpr)?
LabeledTypeExpr
<- BlockLabel Block
/ BlockLabel? LoopTypeExpr
/ BlockLabel? SwitchExpr
LoopTypeExpr <- KEYWORD_inline? (ForTypeExpr / WhileTypeExpr)
ForTypeExpr <- ForPrefix TypeExpr (KEYWORD_else TypeExpr)?
WhileTypeExpr <- WhilePrefix TypeExpr (KEYWORD_else Payload? TypeExpr)?
SwitchExpr <- KEYWORD_switch LPAREN Expr RPAREN LBRACE SwitchProngList RBRACE
# *** Assembly ***
AsmExpr <- KEYWORD_asm KEYWORD_volatile? LPAREN Expr AsmOutput? RPAREN
AsmOutput <- COLON AsmOutputList AsmInput?
AsmOutputItem <- LBRACKET IDENTIFIER RBRACKET STRINGLITERAL LPAREN (MINUSRARROW TypeExpr / IDENTIFIER) RPAREN
AsmInput <- COLON AsmInputList AsmClobbers?
AsmInputItem <- LBRACKET IDENTIFIER RBRACKET STRINGLITERAL LPAREN Expr RPAREN
AsmClobbers <- COLON Expr
# *** Helper grammar ***
BreakLabel <- COLON IDENTIFIER
BlockLabel <- IDENTIFIER COLON
FieldInit <- DOT IDENTIFIER EQUAL Expr
WhileContinueExpr <- COLON LPAREN AssignExpr RPAREN
LinkSection <- KEYWORD_linksection LPAREN Expr RPAREN
AddrSpace <- KEYWORD_addrspace LPAREN Expr RPAREN
# Fn specific
CallConv <- KEYWORD_callconv LPAREN Expr RPAREN
ParamDecl
<- doc_comment? (KEYWORD_noalias / KEYWORD_comptime)? (IDENTIFIER COLON)? ParamType
/ DOT3
ParamType
<- KEYWORD_anytype
/ TypeExpr
# Control flow prefixes
IfPrefix <- KEYWORD_if LPAREN Expr RPAREN PtrPayload?
WhilePrefix <- KEYWORD_while LPAREN Expr RPAREN PtrPayload? WhileContinueExpr?
ForPrefix <- KEYWORD_for LPAREN ForArgumentsList RPAREN PtrListPayload
# Payloads
Payload <- PIPE IDENTIFIER PIPE
PtrPayload <- PIPE ASTERISK? IDENTIFIER PIPE
PtrIndexPayload <- PIPE ASTERISK? IDENTIFIER (COMMA IDENTIFIER)? PIPE
PtrListPayload <- PIPE ASTERISK? IDENTIFIER (COMMA ASTERISK? IDENTIFIER)* COMMA? PIPE
# Switch specific
SwitchProng <- KEYWORD_inline? SwitchCase EQUALRARROW PtrIndexPayload? SingleAssignExpr
SwitchCase
<- SwitchItem (COMMA SwitchItem)* COMMA?
/ KEYWORD_else
SwitchItem <- Expr (DOT3 Expr)?
# For specific
ForArgumentsList <- ForItem (COMMA ForItem)* COMMA?
ForItem <- Expr (DOT2 Expr?)?
# Operators
AssignOp
<- ASTERISKEQUAL
/ ASTERISKPIPEEQUAL
/ SLASHEQUAL
/ PERCENTEQUAL
/ PLUSEQUAL
/ PLUSPIPEEQUAL
/ MINUSEQUAL
/ MINUSPIPEEQUAL
/ LARROW2EQUAL
/ LARROW2PIPEEQUAL
/ RARROW2EQUAL
/ AMPERSANDEQUAL
/ CARETEQUAL
/ PIPEEQUAL
/ ASTERISKPERCENTEQUAL
/ PLUSPERCENTEQUAL
/ MINUSPERCENTEQUAL
/ EQUAL
CompareOp
<- EQUALEQUAL
/ EXCLAMATIONMARKEQUAL
/ LARROW
/ RARROW
/ LARROWEQUAL
/ RARROWEQUAL
BitwiseOp
<- AMPERSAND
/ CARET
/ PIPE
/ KEYWORD_orelse
/ KEYWORD_catch Payload?
BitShiftOp
<- LARROW2
/ RARROW2
/ LARROW2PIPE
AdditionOp
<- PLUS
/ MINUS
/ PLUS2
/ PLUSPERCENT
/ MINUSPERCENT
/ PLUSPIPE
/ MINUSPIPE
MultiplyOp
<- PIPE2
/ ASTERISK
/ SLASH
/ PERCENT
/ ASTERISK2
/ ASTERISKPERCENT
/ ASTERISKPIPE
PrefixOp
<- EXCLAMATIONMARK
/ MINUS
/ TILDE
/ MINUSPERCENT
/ AMPERSAND
/ KEYWORD_try
PrefixTypeOp
<- QUESTIONMARK
/ KEYWORD_anyframe MINUSRARROW
/ SliceTypeStart (ByteAlign / AddrSpace / KEYWORD_const / KEYWORD_volatile / KEYWORD_allowzero)*
/ PtrTypeStart (AddrSpace / KEYWORD_align LPAREN Expr (COLON Expr COLON Expr)? RPAREN / KEYWORD_const / KEYWORD_volatile / KEYWORD_allowzero)*
/ ArrayTypeStart
SuffixOp
<- LBRACKET Expr (DOT2 (Expr? (COLON Expr)?)?)? RBRACKET
/ DOT IDENTIFIER
/ DOTASTERISK
/ DOTQUESTIONMARK
FnCallArguments <- LPAREN ExprList RPAREN
# Ptr specific
SliceTypeStart <- LBRACKET (COLON Expr)? RBRACKET
PtrTypeStart
<- ASTERISK
/ ASTERISK2
/ LBRACKET ASTERISK (LETTERC / COLON Expr)? RBRACKET
ArrayTypeStart <- LBRACKET Expr (COLON Expr)? RBRACKET
# ContainerDecl specific
ContainerDeclAuto <- ContainerDeclType LBRACE ContainerMembers RBRACE
ContainerDeclType
<- KEYWORD_struct (LPAREN Expr RPAREN)?
/ KEYWORD_opaque
/ KEYWORD_enum (LPAREN Expr RPAREN)?
/ KEYWORD_union (LPAREN (KEYWORD_enum (LPAREN Expr RPAREN)? / Expr) RPAREN)?
# Alignment
ByteAlign <- KEYWORD_align LPAREN Expr RPAREN
# Lists
IdentifierList <- (doc_comment? IDENTIFIER COMMA)* (doc_comment? IDENTIFIER)?
SwitchProngList <- (SwitchProng COMMA)* SwitchProng?
AsmOutputList <- (AsmOutputItem COMMA)* AsmOutputItem?
AsmInputList <- (AsmInputItem COMMA)* AsmInputItem?
ParamDeclList <- (ParamDecl COMMA)* ParamDecl?
ExprList <- (Expr COMMA)* Expr?
# *** Tokens ***
eof <- !.
bin <- [01]
bin_ <- '_'? bin
oct <- [0-7]
oct_ <- '_'? oct
hex <- [0-9a-fA-F]
hex_ <- '_'? hex
dec <- [0-9]
dec_ <- '_'? dec
bin_int <- bin bin_*
oct_int <- oct oct_*
dec_int <- dec dec_*
hex_int <- hex hex_*
ox80_oxBF <- [\200-\277]
oxF4 <- '\364'
ox80_ox8F <- [\200-\217]
oxF1_oxF3 <- [\361-\363]
oxF0 <- '\360'
ox90_0xBF <- [\220-\277]
oxEE_oxEF <- [\356-\357]
oxED <- '\355'
ox80_ox9F <- [\200-\237]
oxE1_oxEC <- [\341-\354]
oxE0 <- '\340'
oxA0_oxBF <- [\240-\277]
oxC2_oxDF <- [\302-\337]
# From https://lemire.me/blog/2018/05/09/how-quickly-can-you-check-that-a-string-is-valid-unicode-utf-8/
# First Byte Second Byte Third Byte Fourth Byte
# [0x00,0x7F]
# [0xC2,0xDF] [0x80,0xBF]
# 0xE0 [0xA0,0xBF] [0x80,0xBF]
# [0xE1,0xEC] [0x80,0xBF] [0x80,0xBF]
# 0xED [0x80,0x9F] [0x80,0xBF]
# [0xEE,0xEF] [0x80,0xBF] [0x80,0xBF]
# 0xF0 [0x90,0xBF] [0x80,0xBF] [0x80,0xBF]
# [0xF1,0xF3] [0x80,0xBF] [0x80,0xBF] [0x80,0xBF]
# 0xF4 [0x80,0x8F] [0x80,0xBF] [0x80,0xBF]
multibyte_utf8 <-
oxF4 ox80_ox8F ox80_oxBF ox80_oxBF
/ oxF1_oxF3 ox80_oxBF ox80_oxBF ox80_oxBF
/ oxF0 ox90_0xBF ox80_oxBF ox80_oxBF
/ oxEE_oxEF ox80_oxBF ox80_oxBF
/ oxED ox80_ox9F ox80_oxBF
/ oxE1_oxEC ox80_oxBF ox80_oxBF
/ oxE0 oxA0_oxBF ox80_oxBF
/ oxC2_oxDF ox80_oxBF
non_control_ascii <- [\040-\176]
char_escape
<- "\\x" hex hex
/ "\\u{" hex+ "}"
/ "\\" [nr\\t'"]
char_char
<- multibyte_utf8
/ char_escape
/ ![\\'\n] non_control_ascii
string_char
<- multibyte_utf8
/ char_escape
/ ![\\"\n] non_control_ascii
container_doc_comment <- ('//!' [^\n]* [ \n]* skip)+
doc_comment <- ('///' [^\n]* [ \n]* skip)+
line_comment <- '//' ![!/][^\n]* / '////' [^\n]*
line_string <- ('\\\\' [^\n]* [ \n]*)+
skip <- ([ \n] / line_comment)*
CHAR_LITERAL <- ['] char_char ['] skip
FLOAT
<- '0x' hex_int '.' hex_int ([pP] [-+]? dec_int)? skip
/ dec_int '.' dec_int ([eE] [-+]? dec_int)? skip
/ '0x' hex_int [pP] [-+]? dec_int skip
/ dec_int [eE] [-+]? dec_int skip
INTEGER
<- '0b' bin_int skip
/ '0o' oct_int skip
/ '0x' hex_int skip
/ dec_int skip
STRINGLITERALSINGLE <- ["] string_char* ["] skip
STRINGLITERAL
<- STRINGLITERALSINGLE
/ (line_string skip)+
IDENTIFIER
<- !keyword [A-Za-z_] [A-Za-z0-9_]* skip
/ '@' STRINGLITERALSINGLE
BUILTINIDENTIFIER <- '@'[A-Za-z_][A-Za-z0-9_]* skip
AMPERSAND <- '&' ![=] skip
AMPERSANDEQUAL <- '&=' skip
ASTERISK <- '*' ![*%=|] skip
ASTERISK2 <- '**' skip
ASTERISKEQUAL <- '*=' skip
ASTERISKPERCENT <- '*%' ![=] skip
ASTERISKPERCENTEQUAL <- '*%=' skip
ASTERISKPIPE <- '*|' ![=] skip
ASTERISKPIPEEQUAL <- '*|=' skip
CARET <- '^' ![=] skip
CARETEQUAL <- '^=' skip
COLON <- ':' skip
COMMA <- ',' skip
DOT <- '.' ![*.?] skip
DOT2 <- '..' ![.] skip
DOT3 <- '...' skip
DOTASTERISK <- '.*' skip
DOTQUESTIONMARK <- '.?' skip
EQUAL <- '=' ![>=] skip
EQUALEQUAL <- '==' skip
EQUALRARROW <- '=>' skip
EXCLAMATIONMARK <- '!' ![=] skip
EXCLAMATIONMARKEQUAL <- '!=' skip
LARROW <- '<' ![<=] skip
LARROW2 <- '<<' ![=|] skip
LARROW2EQUAL <- '<<=' skip
LARROW2PIPE <- '<<|' ![=] skip
LARROW2PIPEEQUAL <- '<<|=' skip
LARROWEQUAL <- '<=' skip
LBRACE <- '{' skip
LBRACKET <- '[' skip
LPAREN <- '(' skip
MINUS <- '-' ![%=>|] skip
MINUSEQUAL <- '-=' skip
MINUSPERCENT <- '-%' ![=] skip
MINUSPERCENTEQUAL <- '-%=' skip
MINUSPIPE <- '-|' ![=] skip
MINUSPIPEEQUAL <- '-|=' skip
MINUSRARROW <- '->' skip
PERCENT <- '%' ![=] skip
PERCENTEQUAL <- '%=' skip
PIPE <- '|' ![|=] skip
PIPE2 <- '||' skip
PIPEEQUAL <- '|=' skip
PLUS <- '+' ![%+=|] skip
PLUS2 <- '++' skip
PLUSEQUAL <- '+=' skip
PLUSPERCENT <- '+%' ![=] skip
PLUSPERCENTEQUAL <- '+%=' skip
PLUSPIPE <- '+|' ![=] skip
PLUSPIPEEQUAL <- '+|=' skip
LETTERC <- 'c' skip
QUESTIONMARK <- '?' skip
RARROW <- '>' ![>=] skip
RARROW2 <- '>>' ![=] skip
RARROW2EQUAL <- '>>=' skip
RARROWEQUAL <- '>=' skip
RBRACE <- '}' skip
RBRACKET <- ']' skip
RPAREN <- ')' skip
SEMICOLON <- ';' skip
SLASH <- '/' ![=] skip
SLASHEQUAL <- '/=' skip
TILDE <- '~' skip
end_of_word <- ![a-zA-Z0-9_] skip
KEYWORD_addrspace <- 'addrspace' end_of_word
KEYWORD_align <- 'align' end_of_word
KEYWORD_allowzero <- 'allowzero' end_of_word
KEYWORD_and <- 'and' end_of_word
KEYWORD_anyframe <- 'anyframe' end_of_word
KEYWORD_anytype <- 'anytype' end_of_word
KEYWORD_asm <- 'asm' end_of_word
KEYWORD_break <- 'break' end_of_word
KEYWORD_callconv <- 'callconv' end_of_word
KEYWORD_catch <- 'catch' end_of_word
KEYWORD_comptime <- 'comptime' end_of_word
KEYWORD_const <- 'const' end_of_word
KEYWORD_continue <- 'continue' end_of_word
KEYWORD_defer <- 'defer' end_of_word
KEYWORD_else <- 'else' end_of_word
KEYWORD_enum <- 'enum' end_of_word
KEYWORD_errdefer <- 'errdefer' end_of_word
KEYWORD_error <- 'error' end_of_word
KEYWORD_export <- 'export' end_of_word
KEYWORD_extern <- 'extern' end_of_word
KEYWORD_fn <- 'fn' end_of_word
KEYWORD_for <- 'for' end_of_word
KEYWORD_if <- 'if' end_of_word
KEYWORD_inline <- 'inline' end_of_word
KEYWORD_noalias <- 'noalias' end_of_word
KEYWORD_nosuspend <- 'nosuspend' end_of_word
KEYWORD_noinline <- 'noinline' end_of_word
KEYWORD_opaque <- 'opaque' end_of_word
KEYWORD_or <- 'or' end_of_word
KEYWORD_orelse <- 'orelse' end_of_word
KEYWORD_packed <- 'packed' end_of_word
KEYWORD_pub <- 'pub' end_of_word
KEYWORD_resume <- 'resume' end_of_word
KEYWORD_return <- 'return' end_of_word
KEYWORD_linksection <- 'linksection' end_of_word
KEYWORD_struct <- 'struct' end_of_word
KEYWORD_suspend <- 'suspend' end_of_word
KEYWORD_switch <- 'switch' end_of_word
KEYWORD_test <- 'test' end_of_word
KEYWORD_threadlocal <- 'threadlocal' end_of_word
KEYWORD_try <- 'try' end_of_word
KEYWORD_union <- 'union' end_of_word
KEYWORD_unreachable <- 'unreachable' end_of_word
KEYWORD_var <- 'var' end_of_word
KEYWORD_volatile <- 'volatile' end_of_word
KEYWORD_while <- 'while' end_of_word
keyword <- KEYWORD_addrspace / KEYWORD_align / KEYWORD_allowzero / KEYWORD_and
/ KEYWORD_anyframe / KEYWORD_anytype / KEYWORD_asm
/ KEYWORD_break / KEYWORD_callconv / KEYWORD_catch
/ KEYWORD_comptime / KEYWORD_const / KEYWORD_continue / KEYWORD_defer
/ KEYWORD_else / KEYWORD_enum / KEYWORD_errdefer / KEYWORD_error / KEYWORD_export
/ KEYWORD_extern / KEYWORD_fn / KEYWORD_for / KEYWORD_if
/ KEYWORD_inline / KEYWORD_noalias / KEYWORD_nosuspend / KEYWORD_noinline
/ KEYWORD_opaque / KEYWORD_or / KEYWORD_orelse / KEYWORD_packed
/ KEYWORD_pub / KEYWORD_resume / KEYWORD_return / KEYWORD_linksection
/ KEYWORD_struct / KEYWORD_suspend / KEYWORD_switch / KEYWORD_test
/ KEYWORD_threadlocal / KEYWORD_try / KEYWORD_union / KEYWORD_unreachable
/ KEYWORD_var / KEYWORD_volatile / KEYWORD_while