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bash.nez
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// Bash 2.x
//
File = Block
Chunk = Block
S = [ \t]
/ COMMENT
_ = S*
COMMENT = '#' ( !BREAK . )*
BREAK = '\n'
/ '\r\n'
/ '\r'
NL = ';'
/ BREAK
/ !.
W = [a-zA-Z0-9_]
FILENAME = ( ESCAPED_CHAR / !FORBIDDEN_CHAR ![\x00] . )+
Statement = IfStatement
/ WhileStatement
/ UntilStatement
/ ForStatement
/ CaseStatement
/ DeclareStatement
/ LetStatement
/ !KEYWORD FunctionStatement
/ !KEYWORD Command
/ Expression
Block = { ( _ $(Statement) _ )* #Block }
conditionalExpression = _ $(Expression) _ NL _
IfStatement = { 'if' conditionalExpression 'then' _ NL $(Block) ( elseClause / elifClause )? _ 'fi' _ NL #IfStatement }
elifClause = $(ElifBlock)
ElifBlock = { $(ElifBody) #Block }
ElifBody = { 'elif' conditionalExpression 'then' _ NL $(Block) ( elseClause / elifClause )? #IfStatement }
elseClause = _ 'else' _ NL $(Block)
doDoneBlock = 'do' _ NL $(Block) 'done' _
WhileStatement = { 'while' conditionalExpression doDoneBlock NL _ #WhileStatement }
UntilStatement = { 'until' conditionalExpression doDoneBlock NL _ #UntilStatement }
ForStatement = { 'for' _ ($(Literal) _ 'in' _ $(Expression) / '((' _ $(Expression) _ NL _ $(Expression) _ NL _ $(Expression) _ '))') _ NL _ doDoneBlock NL _ #ForStatement }
CaseStatement = { 'case' _ addCase #CaseStatement }
addCase = $(PrimaryExpression) _ 'in' _ $(CaseMember) _ ( $(CaseMember) _ )* ($(LastCaseMember) / 'esac') _
CaseMember = { $(Expression) ')' _ $(Statement) _ ( $(Statement) _ )* ';;' #CaseMember }
LastCaseMember = { $(Defualt) _ $(Statement) _ ( ('esac' / $(Statement)) _ )* #LastCaseMember }
Defualt = { '*' #DefualtExpression } ')'
DeclareStatement = { 'declare' _ ('-i' #Num / '-a' #Array) _ $(Name) _ NL }
/ { 'declare' _ $(Name) _ NL #String }
postfixExpression = '++' #PrefixInc
/ '--' #PrefixDec
LetStatement = { 'let' _ postfixExpression _ $(Name) _ NL }
FunctionStatement = { ($(FunctionDecl) / $(FunctionCall)) #functionStatement }
FunctionDecl = { 'function'? S* $(FunctionName) '()' S* '{' S* $(Block) S* '}' #functionDecl }
FunctionCall = { $(FunctionName) S* $(ArgList) S* #functionCall }
FunctionName = { Name #functionName }
ArgList = { ( $(Arg) S+ )+ #Args }
Arg = { W+ #arg }
Command = CommandExpr _ NL
// <new line>, ';', '&'
CommandExpr = { $(CommandList) _ $(Background?) #command }
Background = { '&' #background } _
CommandList = OrList
OrList = AndList {$ _ '||' _ $(AndList) #or }*
AndList = PipedCommand {$ _ '&&' _ $(PipedCommand) #and }*
PipedCommand = SingleCommand {$ _ '|' _ $(SingleCommand) #pipe }*
SingleCommand = { $(CmdSymbolSeq) ( S* $(Redirect) / S* $(HereDoc) / S+ $(CommandArg) )* #singleCommand }
Redirect = { $(RedirectOpArgLess) / $(RedirectOp) _ $(CommandArg) #redirect }
RedirectOp = { NUMBER? '>>' / NUMBER? '>' / '&>>' / '&>' / '<<<' / '<' #redirectOp }
RedirectOpArgLess = { NUMBER '>&' NUMBER #redirectOp }
NUMBER = '0'
/ [1-9] [0-9]*
CmdSymbolSeq = { $(CmdSymbol)+ #commandName }
CommandArg = { $(CmdSymbolEQ)+ #commandArg }
CmdSymbol = CString
/ SubCmd
/ SubExpr
/ PathExpression
/ Identifier
CmdSymbolEQ = CString
/ SubCmd
/ SubExpr
/ IdentifierEQ
/ Identifier
SubCmd = '`' S? { $(CommandExpr) S? NL? #backquoteSubstitution } S? '`'
/ '$(' S? { $(CommandExpr) S? NL? #substitution } S? ')'
SubExpr = '$' { $(SubExprSuffix) #subExpr }
/ '${' { $(VarName) '[' addINDEX ']' #arraySubExpr } '}'
/ '${' { $(SubExprSuffix) #subExpr } '}'
addINDEX = NUMBER
/ '@'
/ '*'
SubExprSuffix = VarName
/ { '?' / '*' / '@' / '#' / NUMBER #specialChar }
VarName = { '_' ( '_' / LETTER / NUMBER )+ / LETTER ( '_' / LETTER / NUMBER )* #varName }
LETTER = [a-zA-Z]+
Identifier = { '$' / ( ESCAPED_CHAR / !FORBIDDEN_CHAR . )+ #identifier }
IdentifierEQ = { '$' / ( ESCAPED_CHAR / !FORBIDDEN_CHAR_WITHOUT_EQUAL . )+ #identifier }
FORBIDDEN_CHAR = '\t'
/ ' '
/ '\n'
/ '\r'
/ '{'
/ '}'
/ '('
/ ')'
/ ';'
/ '!'
/ '`'
/ '\''
/ '"'
/ '&'
/ '|'
/ '#'
/ '$'
/ '<'
/ '>'
/ '='
FORBIDDEN_CHAR_WITHOUT_EQUAL = '\t'
/ ' '
/ '\n'
/ '\r'
/ '{'
/ '}'
/ '('
/ ')'
/ ';'
/ '!'
/ '`'
/ '\''
/ '"'
/ '&'
/ '|'
/ '#'
/ '$'
/ '<'
/ '>'
ESCAPED_CHAR = '\\' (FORBIDDEN_CHAR / .)
Expression = { ( $(AssignmentExpression) _ )+ $(Command)? #CommandWithAssign }
/ !KEYWORD (TestCommand / ExprCommand / EqualityExpression)
TestCommand = { 'test' S+ $(EqualityExpression) #Test }
ExprCommand = { 'expr' S+ $(EqualityExpression) #Test }
AssignmentExpression = { $(LeftValueExpression) '=' ($(CommandArg) / $(Literal)) #Assign }
LeftValueExpression = { $(Name) '[' addINDEX ']' #Variable }
/ Name
/ CInteger
EqualityExpression = RelationalExpression {$ _ ("-eq" #Equals / "-ne" #NotEquals) _ $(RelationalExpression) }*
RelationalExpression = AdditiveExpression {$ _ ("-le" #LessThanEquals / "-ge" #GreaterThanEquals / "-lt" #LessThan / "-gt" #GreaterThan) _ $(AdditiveExpression) }*
AdditiveExpression = MultiplicativeExpression {$ _ ("+" #Add / "-" !( "le" / "ge" / "lt" / "gt" / "eq" / "ne" ) #Sub) _ $(MultiplicativeExpression) }*
MultiplicativeExpression = PrimaryExpression {$ _ ("*" #Mul / "/" #Div / "%" #Mod) _ $(PrimaryExpression) }*
PrimaryExpression = { '$(' _ ($(Expression) / $(Command)) _ ')' #SubCommand }
/ { '${' $(Name) '}' #Variable }
/ { '$' $(Name) #Variable }
/ { '((' $(Expression) '))' #Variable }
/ { '[' S+ $(Expression) S+ ']' #Variable }
/ { '#' $(Name) '[' addINDEX ']' #Variable }
/ Literal
/ PathExpression
Literal = CFloat
/ CInteger
/ Name
/ CString
/ ArrayLiteral
ArrayLiteral = { '(' _ ( $(Param) ( S+ $(Param) )* )? _ ')' #Array }
Param = Literal
CString = '"' { STRING_CONTENT* #String } '"'
/ "'" { STRING_CONTENT* #String } "'"
STRING_CONTENT = ESCAPE
/ ![\"\n\\] .
ESCAPE = SIMPLE_ESCAPE
/ OCTAL_ESCAPE
/ HEX_ESCAPE
/ UCHAR
UCHAR = '\\u' HEX4
/ '\\U' HEX4 HEX4
HEX4 = HEX HEX HEX HEX
SIMPLE_ESCAPE = '\\' ['\"?\\abfnrtv]
OCTAL_ESCAPE = '\\' [0-7] [0-7]? [0-7]?
HEX_ESCAPE = '\\x' HEX+
KEYWORD = 'for'
/ 'while'
/ 'do'
/ 'done'
/ 'if'
/ 'elif'
/ 'else'
/ 'fi'
/ 'case'
DIGIT = [0-9]
CInteger = { (DECIMAL / HEXICAL / OCTAL) #Integer } INT_SUFFIX?
CFloat = { (DECIMAL_FLOAT / HEX_FLOAT) #Float } FLOAT_SUFFIX?
DECIMAL = [1-9] DIGIT*
HEXICAL = HEX_PREFIX HEX+
OCTAL = '0' [0-7]*
INT_SUFFIX = [uU] LONG_SUFFIX?
/ LONG_SUFFIX [uU]?
LONG_SUFFIX = 'll'
/ 'LL'
/ [lL]
DECIMAL_FLOAT = FRACTION EXPONENT?
/ DIGIT+ EXPONENT
HEX_FRACTION = HEX* '.' HEX+
/ HEX+ '.'
FRACTION = DIGIT* '.' DIGIT+
/ DIGIT+ '.'
BINARY_EXPONENT = [pP] [+\-]? DIGIT+
FLOAT_SUFFIX = [flFL]
EXPONENT = [eE] [+\-]? DIGIT+
HEX_FLOAT = HEX_PREFIX HEX_FRACTION BINARY_EXPONENT?
/ HEX_PREFIX HEX+ BINARY_EXPONENT
HEX_PREFIX = '0' [xX]
HereDoc = { #HereDoc $(HereDocStart) _ $(HereDocDelim) _ $(Redirect?) BREAK $(HereDocBody) _ }
HereDocStart = { #IgnoreTab ("<<-" `true` / "<<" `false`) }
HereDocBody = { #Body ( !( BREAK DELIM_KEYWORD ) . )+ } BREAK DELIM_KEYWORD
HereDocDelim = { ("\"" DELIM_KEYWORD "\"" / "\'" DELIM_KEYWORD "\'") #IgnoreArgs `true` }
/ { DELIM_KEYWORD #IgnoreArgs `false` }
DELIM_KEYWORD = "EOF"
FilePath = { ( FILENAME / '/' )+ #FilePath }
PathExpression = { ( $(SubExpr) / $(FilePath) / $(Literal) )+ #PathExpression }
// formatted by $ nez format