parser

Type Members

1. trait Grammar extends Logger

   

   A trait for defining expression grammars.

   A trait for defining expression grammars.

   Example:

   trait MyGrammar extends Grammar {
   
   // Define expression patterns using expr blocks
   // '~' denotes a sequence of matches
   def comment = expr { "#" ~ untilEOF }
   def expr  = expr { value | string | "(" ~ expr ~ ")" }
   def value = expr { "0" - "9" | "A" - "Z" | "a" - "z" } // Range of characters
   
   // repetition of patterns and syntactic predicate (!->).
   def string     = expr { "\"" ~ repeat("\\" !->  not("\"") | escapeSequence) ~ "\"" }
   def escapeSequence = expr { "\\" ~ ("\"" | "\\" | "/" | "b" | "f" | "n" | "r" | "t" | "u" ~ hexDigit ~ hexDigit ~ hexDigit ~ hexDigit) }
   def digit      = expr { "0" - "9" }
   def hexDigit   = expr { digit | "A" - "F" | "a" - "f" }
   
   // Define tokens to ignore
   def whiteSpace = expr { " " | "\t" | "\n" | "\r" }
   ignore(whiteSpace)
   }
   

2. sealed abstract class ParseError extends Exception

   

3. class Parser extends Logger

   

4. case class SyntaxError(message: String) extends ParseError with Product with Serializable