shell.pegjs

Line
  = _* cmd:Command pipes:(_* "|" _* Command)* redirect:(_* ">" _* Command)? _*
  { return { cmd, pipes: pipes? pipes.map(pipe => pipe[3]): null, redirect: redirect? redirect[3]: null } }
  
Command
  = exe:Executable args:Arguments
  { return { exe, args } }
  
Executable
  = ExecutableName ("/" ExecutableName)*
  { return text() }
  
ExecutableName
  = [^/ \t]+

Arguments
  = args:(_+ Argument)*
  { return args.map(arg => arg[1]) }
  
Argument
  = LiteralArgument
  / CommandArgument
  / SingleQuoteArgument
  / DoubleQuoteArgument
  
LiteralArgument
  = LiteralArgumentChar+
  { return { type: "literal", content: text() } }
  
LiteralArgumentChar "literal argument char"
  = "\\" .
  / [^\\\n\r'"|> ]
  
CommandArgument
  = "$(" line:Line ")"
  { return { type: "parse", content: [ { type: "cmd", cmd } ] } }

SingleQuoteArgument
  = "'" SingleQuoteArgumentChar+ "'"
  { return { type: "literal", content: text().substr(1, text().length - 2) } }
  
SingleQuoteArgumentChar "single quote char"
  = "\\" .
  / [^\\\n\r'|>]

DoubleQuoteArgument
  = '"' part:DoubleQuoteArgumentPart* '"'
  { return { type: "parse", content: part } }
  
DoubleQuoteArgumentPart
  = DoubleQuoteArgumentChar+ { return { type: "literal", content: text() } }
  / cmd:DoubleQuoteCommand { return { type: "cmd", cmd } }
  
DoubleQuoteCommand
  = "$(" line:Line ")"
  { return line }
  
DoubleQuoteArgumentChar "double quote char"
  = "\\" .
  / [^\\\n\r"|>$]

_ "whitespace"
  = [ \t]+