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/* Title: Pure/ML/ml_lex.scala
Author: Makarius
Lexical syntax for Isabelle/ML and Standard ML.
*/
package isabelle
import scala.collection.mutable
import scala.util.parsing.input.Reader
object ML_Lex
{
/** keywords **/
val keywords: Set[String] =
Set("#", "(", ")", ",", "->", "...", ":", ":>", ";", "=", "=>",
"[", "]", "_", "{", "|", "}", "abstype", "and", "andalso", "as",
"case", "datatype", "do", "else", "end", "eqtype", "exception",
"fn", "fun", "functor", "handle", "if", "in", "include",
"infix", "infixr", "let", "local", "nonfix", "of", "op", "open",
"orelse", "raise", "rec", "sharing", "sig", "signature",
"struct", "structure", "then", "type", "val", "where", "while",
"with", "withtype")
val keywords2: Set[String] =
Set("and", "case", "do", "else", "end", "if", "in", "let", "local",
"of", "sig", "struct", "then", "while", "with")
val keywords3: Set[String] =
Set("handle", "open", "raise")
private val lexicon: Scan.Lexicon = Scan.Lexicon(keywords.toList: _*)
/** tokens **/
object Kind extends Enumeration
{
val KEYWORD = Value("keyword")
val IDENT = Value("identifier")
val LONG_IDENT = Value("long identifier")
val TYPE_VAR = Value("type variable")
val WORD = Value("word")
val INT = Value("integer")
val REAL = Value("real")
val CHAR = Value("character")
val STRING = Value("quoted string")
val SPACE = Value("white space")
val INFORMAL_COMMENT = Value("informal comment")
val FORMAL_COMMENT = Value("formal comment")
val CONTROL = Value("control symbol antiquotation")
val ANTIQ = Value("antiquotation")
val ANTIQ_START = Value("antiquotation: start")
val ANTIQ_STOP = Value("antiquotation: stop")
val ANTIQ_OTHER = Value("antiquotation: other")
val ANTIQ_STRING = Value("antiquotation: quoted string")
val ANTIQ_ALT_STRING = Value("antiquotation: back-quoted string")
val ANTIQ_CARTOUCHE = Value("antiquotation: text cartouche")
val ERROR = Value("bad input")
}
sealed case class Token(kind: Kind.Value, source: String)
{
def is_keyword: Boolean = kind == Kind.KEYWORD
def is_delimiter: Boolean = is_keyword && !Symbol.is_ascii_identifier(source)
def is_space: Boolean = kind == Kind.SPACE
def is_comment: Boolean = kind == Kind.INFORMAL_COMMENT || kind == Kind.FORMAL_COMMENT
}
/** parsers **/
case object ML_String extends Scan.Line_Context
case class Antiq(ctxt: Scan.Line_Context) extends Scan.Line_Context
private object Parsers extends Scan.Parsers with Antiquote.Parsers with Comment.Parsers
{
/* string material */
private val blanks = many(character(Symbol.is_ascii_blank))
private val blanks1 = many1(character(Symbol.is_ascii_blank))
private val gap = "\\" ~ blanks1 ~ "\\" ^^ { case x ~ y ~ z => x + y + z }
private val gap_start = "\\" ~ blanks ~ """\z""".r ^^ { case x ~ y ~ _ => x + y }
private val escape =
one(character("\"\\abtnvfr".contains(_))) |
"^" ~ one(character(c => '@' <= c && c <= '_')) ^^ { case x ~ y => x + y } |
repeated(character(Symbol.is_ascii_digit), 3, 3)
private val str =
one(character(c => c != '"' && c != '\\' && ' ' <= c && c <= '~')) |
one(s =>
Symbol.is_open(s) || Symbol.is_close(s) || Symbol.is_symbolic(s) || Symbol.is_control(s)) |
"\\" ~ escape ^^ { case x ~ y => x + y }
/* ML char -- without gaps */
private val ml_char: Parser[Token] =
"#\"" ~ str ~ "\"" ^^ { case x ~ y ~ z => Token(Kind.CHAR, x + y + z) }
private val recover_ml_char: Parser[String] =
"#\"" ~ opt(str) ^^ { case x ~ Some(y) => x + y case x ~ None => x }
/* ML string */
private val ml_string_body: Parser[String] =
rep(gap | str) ^^ (_.mkString)
private val recover_ml_string: Parser[String] =
"\"" ~ ml_string_body ^^ { case x ~ y => x + y }
private val ml_string: Parser[Token] =
"\"" ~ ml_string_body ~ "\"" ^^ { case x ~ y ~ z => Token(Kind.STRING, x + y + z) }
private def ml_string_line(ctxt: Scan.Line_Context): Parser[(Token, Scan.Line_Context)] =
{
def result(x: String, c: Scan.Line_Context) = (Token(Kind.STRING, x), c)
ctxt match {
case Scan.Finished =>
"\"" ~ ml_string_body ~ ("\"" | gap_start) ^^
{ case x ~ y ~ z => result(x + y + z, if (z == "\"") Scan.Finished else ML_String) }
case ML_String =>
blanks ~ opt_term("\\" ~ ml_string_body ~ ("\"" | gap_start)) ^^
{ case x ~ Some(y ~ z ~ w) =>
result(x + y + z + w, if (w == "\"") Scan.Finished else ML_String)
case x ~ None => result(x, ML_String) }
case _ => failure("")
}
}
/* ML comment */
private val ml_comment: Parser[Token] =
comment ^^ (x => Token(Kind.INFORMAL_COMMENT, x))
private def ml_comment_line(ctxt: Scan.Line_Context): Parser[(Token, Scan.Line_Context)] =
comment_line(ctxt) ^^ { case (x, c) => (Token(Kind.INFORMAL_COMMENT, x), c) }
private val ml_formal_comment: Parser[Token] =
comment_cartouche ^^ (x => Token(Kind.FORMAL_COMMENT, x))
private def ml_formal_comment_line(ctxt: Scan.Line_Context)
: Parser[(Token, Scan.Line_Context)] =
comment_cartouche_line(ctxt) ^^ { case (x, c) => (Token(Kind.FORMAL_COMMENT, x), c) }
/* antiquotations (line-oriented) */
def ml_cartouche_line(ctxt: Scan.Line_Context): Parser[(Token, Scan.Line_Context)] =
cartouche_line(ctxt) ^^ { case (x, c) => (Token(Kind.ANTIQ_CARTOUCHE, x), c) }
def ml_antiq_start(ctxt: Scan.Line_Context): Parser[(Token, Scan.Line_Context)] =
ctxt match {
case Scan.Finished => "@{" ^^ (x => (Token(Kind.ANTIQ_START, x), Antiq(Scan.Finished)))
case _ => failure("")
}
def ml_antiq_stop(ctxt: Scan.Line_Context): Parser[(Token, Scan.Line_Context)] =
ctxt match {
case Antiq(Scan.Finished) => "}" ^^ (x => (Token(Kind.ANTIQ_STOP, x), Scan.Finished))
case _ => failure("")
}
def ml_antiq_body(context: Scan.Line_Context): Parser[(Token, Scan.Line_Context)] =
context match {
case Antiq(ctxt) =>
(if (ctxt == Scan.Finished) antiq_other ^^ (x => (Token(Kind.ANTIQ_OTHER, x), context))
else failure("")) |
quoted_line("\"", ctxt) ^^ { case (x, c) => (Token(Kind.ANTIQ_STRING, x), Antiq(c)) } |
quoted_line("`", ctxt) ^^ { case (x, c) => (Token(Kind.ANTIQ_ALT_STRING, x), Antiq(c)) } |
cartouche_line(ctxt) ^^ { case (x, c) => (Token(Kind.ANTIQ_CARTOUCHE, x), Antiq(c)) }
case _ => failure("")
}
/* token */
private def other_token: Parser[Token] =
{
/* identifiers */
val letdigs = many(character(Symbol.is_ascii_letdig))
val alphanumeric =
one(character(Symbol.is_ascii_letter)) ~ letdigs ^^ { case x ~ y => x + y }
val symbolic = many1(character("!#$%&*+-/:<=>?@\\^`|~".contains(_)))
val ident = (alphanumeric | symbolic) ^^ (x => Token(Kind.IDENT, x))
val long_ident =
rep1(alphanumeric ~ "." ^^ { case x ~ y => x + y }) ~
(alphanumeric | (symbolic | "=")) ^^
{ case x ~ y => Token(Kind.LONG_IDENT, x.mkString + y) }
val type_var = "'" ~ letdigs ^^ { case x ~ y => Token(Kind.TYPE_VAR, x + y) }
/* numerals */
val dec = many1(character(Symbol.is_ascii_digit))
val hex = many1(character(Symbol.is_ascii_hex))
val sign = opt("~") ^^ { case Some(x) => x case None => "" }
val decint = sign ~ dec ^^ { case x ~ y => x + y }
val exp = ("E" | "e") ~ decint ^^ { case x ~ y => x + y }
val word =
("0wx" ~ hex ^^ { case x ~ y => x + y } | "0w" ~ dec ^^ { case x ~ y => x + y }) ^^
(x => Token(Kind.WORD, x))
val int =
sign ~ ("0x" ~ hex ^^ { case x ~ y => x + y } | dec) ^^
{ case x ~ y => Token(Kind.INT, x + y) }
val rat =
decint ~ opt("/" ~ dec) ^^ { case x ~ None => x case x ~ Some(y ~ z) => x + y + z }
val real =
(decint ~ "." ~ dec ~ (opt(exp) ^^ { case Some(x) => x case None => "" }) ^^
{ case x ~ y ~ z ~ w => x + y + z + w } |
decint ~ exp ^^ { case x ~ y => x + y }) ^^ (x => Token(Kind.REAL, x))
/* main */
val space = blanks1 ^^ (x => Token(Kind.SPACE, x))
val keyword = literal(lexicon) ^^ (x => Token(Kind.KEYWORD, x))
val ml_control = control ^^ (x => Token(Kind.CONTROL, x))
val ml_antiq =
"@" ~ rat ^^ { case x ~ y => Token(Kind.ANTIQ, x + y) } |
antiq ^^ (x => Token(Kind.ANTIQ, x))
val bad = one(_ => true) ^^ (x => Token(Kind.ERROR, x))
val recover =
(recover_ml_char | (recover_ml_string | (recover_cartouche | recover_comment))) ^^
(x => Token(Kind.ERROR, x))
space | (ml_control | (recover | (ml_antiq |
(((word | (real | (int | (long_ident | (ident | type_var))))) ||| keyword) | bad))))
}
def token: Parser[Token] =
ml_char | (ml_string | (ml_comment | (ml_formal_comment | other_token)))
def token_line(SML: Boolean, ctxt: Scan.Line_Context): Parser[(Token, Scan.Line_Context)] =
{
val other = (ml_char | other_token) ^^ (x => (x, Scan.Finished))
if (SML) ml_string_line(ctxt) | (ml_comment_line(ctxt) | other)
else {
ml_string_line(ctxt) |
(ml_comment_line(ctxt) |
(ml_formal_comment_line(ctxt) |
(ml_cartouche_line(ctxt) |
(ml_antiq_start(ctxt) | (ml_antiq_stop(ctxt) | (ml_antiq_body(ctxt) | other))))))
}
}
}
/* tokenize */
def tokenize(input: CharSequence): List[Token] =
Parsers.parseAll(Parsers.rep(Parsers.token), Scan.char_reader(input)) match {
case Parsers.Success(tokens, _) => tokens
case _ => error("Unexpected failure of tokenizing input:\n" + input.toString)
}
def tokenize_line(SML: Boolean, input: CharSequence, context: Scan.Line_Context)
: (List[Token], Scan.Line_Context) =
{
var in: Reader[Char] = Scan.char_reader(input)
val toks = new mutable.ListBuffer[Token]
var ctxt = context
while (!in.atEnd) {
Parsers.parse(Parsers.token_line(SML, ctxt), in) match {
case Parsers.Success((x, c), rest) => toks += x; ctxt = c; in = rest
case Parsers.NoSuccess(_, rest) =>
error("Unexpected failure of tokenizing input:\n" + rest.source.toString)
}
}
(toks.toList, ctxt)
}
}
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