author | wenzelm |
Sat, 15 Feb 2014 14:52:51 +0100 | |
changeset 55499 | 2581fbee5b95 |
parent 55497 | c0f8aebfb43d |
child 55510 | 1585a65aad64 |
permissions | -rw-r--r-- |
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/* Title: Pure/General/scan.scala |
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Author: Makarius |
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Efficient scanning of keywords and tokens. |
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*/ |
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package isabelle |
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import scala.collection.{IndexedSeq, TraversableOnce} |
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import scala.collection.immutable.PagedSeq |
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import scala.util.parsing.input.{OffsetPosition, Position => InputPosition, Reader} |
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import scala.util.parsing.combinator.RegexParsers |
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import java.io.{File => JFile, BufferedInputStream, FileInputStream} |
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object Scan |
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{ |
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/** context of partial scans (line boundary) **/ |
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abstract class Context |
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case object Finished extends Context |
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case class Quoted(quote: String) extends Context |
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case object Verbatim extends Context |
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case class Cartouche(depth: Int) extends Context |
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case class Comment(depth: Int) extends Context |
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/** parser combinators **/ |
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object Parsers extends Parsers |
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trait Parsers extends RegexParsers |
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{ |
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override val whiteSpace = "".r |
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/* optional termination */ |
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def opt_term[T](p: => Parser[T]): Parser[Option[T]] = |
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p ^^ (x => Some(x)) | """\z""".r ^^ (_ => None) |
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/* repeated symbols */ |
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def repeated(pred: Symbol.Symbol => Boolean, min_count: Int, max_count: Int): Parser[String] = |
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new Parser[String] |
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{ |
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def apply(in: Input) = |
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{ |
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val start = in.offset |
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val end = in.source.length |
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val matcher = new Symbol.Matcher(in.source) |
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var i = start |
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var count = 0 |
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var finished = false |
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while (!finished && i < end && count < max_count) { |
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val n = matcher(i, end) |
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val sym = in.source.subSequence(i, i + n).toString |
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if (pred(sym)) { i += n; count += 1 } |
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else finished = true |
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} |
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if (count < min_count) Failure("bad input", in) |
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else Success(in.source.subSequence(start, i).toString, in.drop(i - start)) |
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} |
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}.named("repeated") |
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def one(pred: Symbol.Symbol => Boolean): Parser[String] = |
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repeated(pred, 1, 1) |
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def many(pred: Symbol.Symbol => Boolean): Parser[String] = |
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repeated(pred, 0, Integer.MAX_VALUE) |
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def many1(pred: Symbol.Symbol => Boolean): Parser[String] = |
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repeated(pred, 1, Integer.MAX_VALUE) |
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/* character */ |
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def character(pred: Char => Boolean): Symbol.Symbol => Boolean = |
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(s: Symbol. Symbol) => s.length == 1 && pred(s.charAt(0)) |
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/* quoted strings */ |
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private def quoted_body(quote: Symbol.Symbol): Parser[String] = |
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{ |
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rep(many1(sym => sym != quote && sym != "\\") | "\\" + quote | "\\\\" | |
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(("""\\\d\d\d""".r) ^? { case x if x.substring(1, 4).toInt <= 255 => x })) ^^ (_.mkString) |
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} |
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def quoted(quote: Symbol.Symbol): Parser[String] = |
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{ |
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quote ~ quoted_body(quote) ~ quote ^^ { case x ~ y ~ z => x + y + z } |
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}.named("quoted") |
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def quoted_content(quote: Symbol.Symbol, source: String): String = |
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require(parseAll(quoted(quote), source).successful) |
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val body = source.substring(1, source.length - 1) |
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if (body.exists(_ == '\\')) { |
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val content = |
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rep(many1(sym => sym != quote && sym != "\\") | |
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"\\" ~> (quote | "\\" | """\d\d\d""".r ^^ { case x => x.toInt.toChar.toString })) |
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parseAll(content ^^ (_.mkString), body).get |
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} |
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else body |
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} |
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def quoted_context(quote: Symbol.Symbol, ctxt: Context): Parser[(String, Context)] = |
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{ |
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ctxt match { |
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case Finished => |
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quote ~ quoted_body(quote) ~ opt_term(quote) ^^ |
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{ case x ~ y ~ Some(z) => (x + y + z, Finished) |
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case x ~ y ~ None => (x + y, Quoted(quote)) } |
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case Quoted(q) if q == quote => |
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quoted_body(quote) ~ opt_term(quote) ^^ |
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{ case x ~ Some(y) => (x + y, Finished) |
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case x ~ None => (x, ctxt) } |
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case _ => failure("") |
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} |
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}.named("quoted_context") |
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def recover_quoted(quote: Symbol.Symbol): Parser[String] = |
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quote ~ quoted_body(quote) ^^ { case x ~ y => x + y } |
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/* verbatim text */ |
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private def verbatim_body: Parser[String] = |
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rep(many1(sym => sym != "*") | """\*(?!\})""".r) ^^ (_.mkString) |
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def verbatim: Parser[String] = |
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{ |
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"{*" ~ verbatim_body ~ "*}" ^^ { case x ~ y ~ z => x + y + z } |
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}.named("verbatim") |
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def verbatim_content(source: String): String = |
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{ |
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require(parseAll(verbatim, source).successful) |
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source.substring(2, source.length - 2) |
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} |
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def verbatim_context(ctxt: Context): Parser[(String, Context)] = |
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{ |
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ctxt match { |
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case Finished => |
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"{*" ~ verbatim_body ~ opt_term("*}") ^^ |
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{ case x ~ y ~ Some(z) => (x + y + z, Finished) |
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case x ~ y ~ None => (x + y, Verbatim) } |
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case Verbatim => |
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verbatim_body ~ opt_term("*}") ^^ |
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{ case x ~ Some(y) => (x + y, Finished) |
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case x ~ None => (x, Verbatim) } |
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case _ => failure("") |
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} |
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}.named("verbatim_context") |
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val recover_verbatim: Parser[String] = |
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"{*" ~ verbatim_body ^^ { case x ~ y => x + y } |
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/* nested text cartouches */ |
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private def cartouche_depth(depth: Int): Parser[(String, Int)] = new Parser[(String, Int)] |
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{ |
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require(depth >= 0) |
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def apply(in: Input) = |
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{ |
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val start = in.offset |
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val end = in.source.length |
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val matcher = new Symbol.Matcher(in.source) |
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var i = start |
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var d = depth |
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var finished = false |
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while (!finished && i < end) { |
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val n = matcher(i, end) |
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val sym = in.source.subSequence(i, i + n).toString |
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if (Symbol.is_open(sym)) { i += n; d += 1 } |
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else if (d > 0) { i += n; if (Symbol.is_close(sym)) d -= 1 } |
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else finished = true |
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} |
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if (i == start) Failure("bad input", in) |
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else Success((in.source.subSequence(start, i).toString, d), in.drop(i - start)) |
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} |
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}.named("cartouche_depth") |
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def cartouche: Parser[String] = |
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cartouche_depth(0) ^? { case (x, d) if d == 0 => x } |
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def cartouche_context(ctxt: Context): Parser[(String, Context)] = |
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{ |
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val depth = |
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ctxt match { |
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case Finished => 0 |
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case Cartouche(d) => d |
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case _ => -1 |
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} |
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if (depth >= 0) |
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cartouche_depth(depth) ^^ |
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{ case (x, 0) => (x, Finished) |
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case (x, d) => (x, Cartouche(d)) } |
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else failure("") |
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} |
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val recover_cartouche: Parser[String] = |
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cartouche_depth(0) ^^ (_._1) |
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def cartouche_content(source: String): String = |
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{ |
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def err(): Nothing = error("Malformed text cartouche: " + quote(source)) |
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val source1 = |
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Library.try_unprefix(Symbol.open_decoded, source) orElse |
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Library.try_unprefix(Symbol.open, source) getOrElse err() |
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Library.try_unsuffix(Symbol.close_decoded, source1) orElse |
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Library.try_unsuffix(Symbol.close, source1) getOrElse err() |
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} |
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/* nested comments */ |
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private def comment_depth(depth: Int): Parser[(String, Int)] = new Parser[(String, Int)] |
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{ |
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require(depth >= 0) |
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val comment_text = |
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rep1(many1(sym => sym != "*" && sym != "(") | """\*(?!\))|\((?!\*)""".r) |
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def apply(in: Input) = |
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{ |
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var rest = in |
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def try_parse[A](p: Parser[A]): Boolean = |
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{ |
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parse(p ^^^ (), rest) match { |
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case Success(_, next) => { rest = next; true } |
242 |
case _ => false |
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} |
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} |
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var d = depth |
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var finished = false |
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while (!finished) { |
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if (try_parse("(*")) d += 1 |
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else if (d > 0 && try_parse("*)")) d -= 1 |
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else if (d == 0 || !try_parse(comment_text)) finished = true |
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} |
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if (in.offset < rest.offset) |
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Success((in.source.subSequence(in.offset, rest.offset).toString, d), rest) |
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else Failure("comment expected", in) |
255 |
} |
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}.named("comment_depth") |
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def comment: Parser[String] = |
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comment_depth(0) ^? { case (x, d) if d == 0 => x } |
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def comment_context(ctxt: Context): Parser[(String, Context)] = |
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{ |
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val depth = |
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ctxt match { |
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case Finished => 0 |
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case Comment(d) => d |
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case _ => -1 |
|
268 |
} |
|
269 |
if (depth >= 0) |
|
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comment_depth(depth) ^^ |
|
271 |
{ case (x, 0) => (x, Finished) |
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272 |
case (x, d) => (x, Comment(d)) } |
|
273 |
else failure("") |
|
274 |
} |
|
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|
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val recover_comment: Parser[String] = |
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comment_depth(0) ^^ (_._1) |
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def comment_content(source: String): String = |
280 |
{ |
|
281 |
require(parseAll(comment, source).successful) |
|
282 |
source.substring(2, source.length - 2) |
|
283 |
} |
|
284 |
||
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/* keyword */ |
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def literal(lexicon: Lexicon): Parser[String] = new Parser[String] |
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{ |
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def apply(in: Input) = |
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{ |
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val result = lexicon.scan(in) |
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if (result.isEmpty) Failure("keyword expected", in) |
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else Success(result, in.drop(result.length)) |
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} |
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}.named("keyword") |
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} |
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298 |
|
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299 |
|
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300 |
|
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301 |
/** Lexicon -- position tree **/ |
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302 |
|
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303 |
object Lexicon |
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304 |
{ |
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305 |
/* representation */ |
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306 |
|
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307 |
private sealed case class Tree(val branches: Map[Char, (String, Tree)]) |
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private val empty_tree = Tree(Map()) |
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309 |
|
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val empty: Lexicon = new Lexicon(empty_tree) |
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def apply(elems: String*): Lexicon = empty ++ elems |
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} |
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313 |
|
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final class Lexicon private(rep: Lexicon.Tree) |
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{ |
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316 |
/* auxiliary operations */ |
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317 |
|
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private def content(tree: Lexicon.Tree, result: List[String]): List[String] = |
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319 |
(result /: tree.branches.toList) ((res, entry) => |
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320 |
entry match { case (_, (s, tr)) => |
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321 |
if (s.isEmpty) content(tr, res) else content(tr, s :: res) }) |
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322 |
|
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323 |
private def lookup(str: CharSequence): Option[(Boolean, Lexicon.Tree)] = |
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324 |
{ |
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325 |
val len = str.length |
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326 |
def look(tree: Lexicon.Tree, tip: Boolean, i: Int): Option[(Boolean, Lexicon.Tree)] = |
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327 |
{ |
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328 |
if (i < len) { |
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329 |
tree.branches.get(str.charAt(i)) match { |
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330 |
case Some((s, tr)) => look(tr, !s.isEmpty, i + 1) |
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331 |
case None => None |
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332 |
} |
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333 |
} else Some(tip, tree) |
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334 |
} |
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335 |
look(rep, false, 0) |
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336 |
} |
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|
337 |
|
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338 |
def completions(str: CharSequence): List[String] = |
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339 |
lookup(str) match { |
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340 |
case Some((true, tree)) => content(tree, List(str.toString)) |
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341 |
case Some((false, tree)) => content(tree, Nil) |
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342 |
case None => Nil |
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343 |
} |
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|
344 |
|
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|
345 |
|
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346 |
/* pseudo Set methods */ |
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347 |
|
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348 |
def iterator: Iterator[String] = content(rep, Nil).sorted.iterator |
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349 |
|
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350 |
override def toString: String = iterator.mkString("Lexicon(", ", ", ")") |
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351 |
|
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352 |
def empty: Lexicon = Lexicon.empty |
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353 |
def isEmpty: Boolean = rep.branches.isEmpty |
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|
354 |
|
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355 |
def contains(elem: String): Boolean = |
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356 |
lookup(elem) match { |
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357 |
case Some((tip, _)) => tip |
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358 |
case _ => false |
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|
359 |
} |
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|
360 |
|
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|
361 |
|
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|
362 |
/* add elements */ |
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|
363 |
|
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364 |
def + (elem: String): Lexicon = |
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365 |
if (contains(elem)) this |
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366 |
else { |
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367 |
val len = elem.length |
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368 |
def extend(tree: Lexicon.Tree, i: Int): Lexicon.Tree = |
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369 |
if (i < len) { |
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370 |
val c = elem.charAt(i) |
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371 |
val end = (i + 1 == len) |
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372 |
tree.branches.get(c) match { |
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373 |
case Some((s, tr)) => |
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374 |
Lexicon.Tree(tree.branches + |
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375 |
(c -> (if (end) elem else s, extend(tr, i + 1)))) |
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376 |
case None => |
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377 |
Lexicon.Tree(tree.branches + |
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378 |
(c -> (if (end) elem else "", extend(Lexicon.empty_tree, i + 1)))) |
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379 |
} |
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|
380 |
} |
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381 |
else tree |
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382 |
new Lexicon(extend(rep, 0)) |
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383 |
} |
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384 |
|
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385 |
def ++ (elems: TraversableOnce[String]): Lexicon = (this /: elems)(_ + _) |
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386 |
|
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|
387 |
|
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|
388 |
/* scan */ |
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|
389 |
|
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390 |
def scan(in: Reader[Char]): String = |
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391 |
{ |
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392 |
val source = in.source |
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393 |
val offset = in.offset |
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394 |
val len = source.length - offset |
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395 |
|
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396 |
def scan_tree(tree: Lexicon.Tree, result: String, i: Int): String = |
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397 |
{ |
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398 |
if (i < len) { |
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399 |
tree.branches.get(source.charAt(offset + i)) match { |
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400 |
case Some((s, tr)) => scan_tree(tr, if (s.isEmpty) result else s, i + 1) |
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|
401 |
case None => result |
28d4db6c6e79
tuned signature -- separate Lexicon from Parsers (in accordance to ML version);
wenzelm
parents:
55034
diff
changeset
|
402 |
} |
28d4db6c6e79
tuned signature -- separate Lexicon from Parsers (in accordance to ML version);
wenzelm
parents:
55034
diff
changeset
|
403 |
} |
28d4db6c6e79
tuned signature -- separate Lexicon from Parsers (in accordance to ML version);
wenzelm
parents:
55034
diff
changeset
|
404 |
else result |
28d4db6c6e79
tuned signature -- separate Lexicon from Parsers (in accordance to ML version);
wenzelm
parents:
55034
diff
changeset
|
405 |
} |
28d4db6c6e79
tuned signature -- separate Lexicon from Parsers (in accordance to ML version);
wenzelm
parents:
55034
diff
changeset
|
406 |
scan_tree(rep, "", 0) |
28d4db6c6e79
tuned signature -- separate Lexicon from Parsers (in accordance to ML version);
wenzelm
parents:
55034
diff
changeset
|
407 |
} |
28d4db6c6e79
tuned signature -- separate Lexicon from Parsers (in accordance to ML version);
wenzelm
parents:
55034
diff
changeset
|
408 |
} |
31648 | 409 |
} |