BNF for VaporParser.jj

// -------------------------------------------------------------
// Tokens

// Whitespace and Comments

<DEFAULT> SKIP : {
" "
| "\t"
| <LineComment: "//" (~["\n","\r"])*>
| <BlockComment: "/*" (~["*"])* "*" ("*" | ~["*","/"] (~["*"])* "*")* "/">
}

   

<DEFAULT> TOKEN : {
<#Digit: ["0"-"9"]>
| <Digits: (<Digit>)+>
| <NegDigits: "-" <Digits>> : {
| <#IdentHead: ["a"-"z","A"-"Z","_"]>
| <#IdentRest: <IdentHead> | <Digit> | ".">
| <Eol: (("\r")* "\n" ([" ","\t"])*)+>
}

   

<DEFAULT> MORE : {
<LitStrStart: "\""> : WITHIN_STRING
}

   

<WITHIN_STRING> TOKEN : {
<LitStr: "\""> : DEFAULT
}

   

<WITHIN_STRING> MORE : {
<EscapeQuote: "\\\""> : {
| <EscapeBackslash: "\\\\"> : {
| <NormalStringContent: [" "-"~"]>
}

   

// -------------------------------------------------------------

<DEFAULT> TOKEN : {
<#Ident: <IdentHead> (<IdentRest>)*>
| <RegIdent: "$" <Ident>> : {
| <CodeLabelIdent: <Ident> ":"> : {
| <LabelRefIdent: ":" <Ident>> : {
| <PlainIdent: <Ident>>
}

   

// Catch-all token.

<*> TOKEN : {
<Anything: ~[]>
}

   

// (The rest of the tokens are defined as we use them in the grammar.)

// -------------------------------------------------------------
// Parser
// -------------------------------------------------------------