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package scalaParser
package syntax
import acyclic.file
import org.parboiled2._
trait Literals { self: Parser with Basic with Identifiers =>
object Literals{
import Basic._
def FloatingPointLiteral = rule {
"." ~ oneOrMore(Digit) ~ optional(ExponentPart) ~ optional(FloatType) |
oneOrMore(Digit) ~ (
"." ~ oneOrMore(Digit) ~ optional(ExponentPart) ~ optional(FloatType) |
ExponentPart ~ optional(FloatType) |
optional(ExponentPart) ~ FloatType
)
}
def IntegerLiteral = rule { (DecimalNumeral | HexNumeral) ~ optional(anyOf("Ll")) }
def BooleanLiteral = rule { Key.W("true") | Key.W("false") }
def MultilineComment: Rule0 = rule { "/*" ~ zeroOrMore(MultilineComment | !"*/" ~ ANY) ~ "*/" }
def Comment: Rule0 = rule {
MultilineComment |
"//" ~ zeroOrMore(!Basic.Newline ~ ANY) ~ &(Basic.Newline | EOI)
}
def Literal = rule {
(optional("-") ~ (FloatingPointLiteral | IntegerLiteral)) |
BooleanLiteral |
CharacterLiteral |
StringLiteral |
SymbolLiteral |
(Key.W("null") ~ !(Basic.Letter | Basic.Digit))
}
def EscapedChars = rule { '\\' ~ anyOf("rnt\\\"") }
// Note that symbols can take on the same values as keywords!
def SymbolLiteral = rule { ''' ~ (Identifiers.PlainId | Identifiers.Keywords) }
def CharacterLiteral = rule { ''' ~ (UnicodeExcape | EscapedChars | !'\\' ~ CharPredicate.from(isPrintableChar)) ~ ''' }
def MultiLineChars = rule { zeroOrMore(optional('"') ~ optional('"') ~ noneOf("\"")) }
def StringLiteral = rule {
(optional(Identifiers.Id) ~ "\"\"\"" ~ MultiLineChars ~ ("\"\"\"" ~ zeroOrMore('"'))) |
(optional(Identifiers.Id) ~ '"' ~ zeroOrMore("\\\"" | noneOf("\n\"")) ~ '"')
}
def isPrintableChar(c: Char): Boolean = {
val block = Character.UnicodeBlock.of(c)
!Character.isISOControl(c) && !Character.isSurrogate(c) && block != null && block != Character.UnicodeBlock.SPECIALS
}
}
}
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