src/Pure/General/symbol.scala
author wenzelm
Tue, 05 Jul 2011 23:18:14 +0200
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parent 43511 d138e7482a1b
child 43695 5130dfe1b7be
permissions -rw-r--r--
simplified Symbol.iterator: produce strings, which are mostly preallocated; eliminated Symbol.CharSequence complications;
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/*  Title:      Pure/General/symbol.scala
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    Author:     Makarius
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Detecting and recoding Isabelle symbols.
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*/
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package isabelle
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import scala.io.Source
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import scala.collection.mutable
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import scala.util.matching.Regex
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object Symbol
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{
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  /* spaces */
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  val spc = ' '
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  val space = " "
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  private val static_spaces = space * 4000
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  def spaces(k: Int): String =
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  {
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    require(k >= 0)
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    if (k < static_spaces.length) static_spaces.substring(0, k)
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    else space * k
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  }
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  /* ASCII characters */
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  def is_ascii_letter(c: Char): Boolean = 'A' <= c && c <= 'Z' || 'a' <= c && c <= 'z'
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  def is_ascii_digit(c: Char): Boolean = '0' <= c && c <= '9'
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  def is_ascii_quasi(c: Char): Boolean = c == '_' || c == '\''
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  def is_ascii_letdig(c: Char): Boolean =
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    is_ascii_letter(c) || is_ascii_digit(c) || is_ascii_quasi(c)
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  def is_ascii_identifier(s: String): Boolean =
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    s.length > 0 && is_ascii_letter(s(0)) && s.substring(1).forall(is_ascii_letdig)
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  /* Symbol regexps */
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  private val plain = new Regex("""(?xs)
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      [^\r\\\ud800-\udfff\ufffd] | [\ud800-\udbff][\udc00-\udfff] """)
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  private val physical_newline = new Regex("""(?xs) \n | \r\n | \r """)
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  private val symbol = new Regex("""(?xs)
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      \\ < (?:
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      \^? [A-Za-z][A-Za-z0-9_']* |
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      \^raw: [\x20-\x7e\u0100-\uffff && [^.>]]* ) >""")
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  private val malformed_symbol = new Regex("(?xs) (?!" + symbol + ")" +
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    """ [\ud800-\udbff\ufffd] | \\<\^? """)
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  val regex_total =
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    new Regex(plain + "|" + physical_newline + "|" + symbol + "|" + malformed_symbol + "| .")
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  /* basic matching */
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  def is_plain(c: Char): Boolean = !(c == '\r' || c == '\\' || '\ud800' <= c && c <= '\udfff')
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  def is_physical_newline(s: String): Boolean =
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    s == "\n" || s == "\r" || s == "\r\n"
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  def is_malformed(s: String): Boolean =
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    !(s.length == 1 && is_plain(s(0))) && malformed_symbol.pattern.matcher(s).matches
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  class Matcher(text: CharSequence)
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  {
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    private val matcher = regex_total.pattern.matcher(text)
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    def apply(start: Int, end: Int): Int =
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    {
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      require(0 <= start && start < end && end <= text.length)
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      if (is_plain(text.charAt(start))) 1
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      else {
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        matcher.region(start, end).lookingAt
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        matcher.group.length
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      }
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    }
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  }
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  /* efficient iterators */
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  private val char_symbols: Array[String] =
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    (0 until 256).iterator.map(i => new String(Array(i.toChar))).toArray
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  def iterator(text: CharSequence): Iterator[String] =
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    new Iterator[String]
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    {
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      private val matcher = new Matcher(text)
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      private var i = 0
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      def hasNext = i < text.length
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      def next =
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      {
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        val n = matcher(i, text.length)
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        val s =
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          if (n == 0) ""
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          else if (n == 1) {
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            val c = text.charAt(i)
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            if (c < char_symbols.length) char_symbols(c)
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            else text.subSequence(i, i + n).toString
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          }
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          else text.subSequence(i, i + n).toString
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        i += n
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        s
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      }
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    }
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  /* decoding offsets */
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  class Index(text: CharSequence)
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  {
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    case class Entry(chr: Int, sym: Int)
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    val index: Array[Entry] =
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    {
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      val matcher = new Matcher(text)
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      val buf = new mutable.ArrayBuffer[Entry]
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      var chr = 0
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      var sym = 0
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      while (chr < text.length) {
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        val n = matcher(chr, text.length)
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        chr += n
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        sym += 1
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        if (n > 1) buf += Entry(chr, sym)
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      }
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      buf.toArray
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    }
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    def decode(sym1: Int): Int =
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    {
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      val sym = sym1 - 1
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      val end = index.length
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      def bisect(a: Int, b: Int): Int =
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      {
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        if (a < b) {
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          val c = (a + b) / 2
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          if (sym < index(c).sym) bisect(a, c)
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          else if (c + 1 == end || sym < index(c + 1).sym) c
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          else bisect(c + 1, b)
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        }
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        else -1
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      }
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      val i = bisect(0, end)
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      if (i < 0) sym
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      else index(i).chr + sym - index(i).sym
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    }
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    def decode(range: Text.Range): Text.Range = range.map(decode(_))
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  }
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  /* recoding text */
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  private class Recoder(list: List[(String, String)])
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  {
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    private val (min, max) =
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    {
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      var min = '\uffff'
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      var max = '\u0000'
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      for ((x, _) <- list) {
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        val c = x(0)
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        if (c < min) min = c
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        if (c > max) max = c
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      }
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      (min, max)
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    }
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    private val table =
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    {
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      var tab = Map[String, String]()
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      for ((x, y) <- list) {
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        tab.get(x) match {
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          case None => tab += (x -> y)
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          case Some(z) =>
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            error("Duplicate mapping of \"" + x + "\" to \"" + y + "\" vs. \"" + z + "\"")
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        }
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      }
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      tab
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    }
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    def recode(text: String): String =
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    {
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      val len = text.length
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      val matcher = regex_total.pattern.matcher(text)
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      val result = new StringBuilder(len)
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      var i = 0
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      while (i < len) {
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        val c = text(i)
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        if (min <= c && c <= max) {
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          matcher.region(i, len).lookingAt
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          val x = matcher.group
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          result.append(table.get(x) getOrElse x)
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          i = matcher.end
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        }
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        else { result.append(c); i += 1 }
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      }
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      result.toString
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    }
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  }
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  /** Symbol interpretation **/
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  class Interpretation(symbol_decls: List[String])
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  {
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    /* read symbols */
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    private val empty = new Regex("""(?xs) ^\s* (?: \#.* )? $ """)
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    private val key = new Regex("""(?xs) (.+): """)
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    private def read_decl(decl: String): (String, Map[String, String]) =
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    {
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      def err() = error("Bad symbol declaration: " + decl)
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      def read_props(props: List[String]): Map[String, String] =
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      {
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        props match {
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          case Nil => Map()
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          case _ :: Nil => err()
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          case key(x) :: y :: rest => read_props(rest) + (x -> y)
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          case _ => err()
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        }
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      }
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      decl.split("\\s+").toList match {
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        case sym :: props if sym.length > 1 && !is_malformed(sym) => (sym, read_props(props))
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        case _ => err()
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      }
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    }
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    private val symbols: List[(String, Map[String, String])] =
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      Map((
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        for (decl <- symbol_decls if !empty.pattern.matcher(decl).matches)
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          yield read_decl(decl)): _*) toList
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    /* misc properties */
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    val names: Map[String, String] =
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    {
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      val name = new Regex("""\\<\^?([A-Za-z][A-Za-z0-9_']*)>""")
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      Map((for ((sym @ name(a), _) <- symbols) yield (sym -> a)): _*)
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    }
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    val abbrevs: Map[String, String] =
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      Map((
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        for ((sym, props) <- symbols if props.isDefinedAt("abbrev"))
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          yield (sym -> props("abbrev"))): _*)
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    /* recoding */
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    private val (decoder, encoder) =
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    {
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      val mapping =
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        for {
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          (sym, props) <- symbols
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          val code =
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            try { Integer.decode(props("code")).intValue }
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            catch {
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              case _: NoSuchElementException => error("Missing code for symbol " + sym)
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              case _: NumberFormatException => error("Bad code for symbol " + sym)
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            }
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          val ch = new String(Character.toChars(code))
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        } yield {
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          if (code < 128) error("Illegal ASCII code for symbol " + sym)
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          else (sym, ch)
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        }
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      (new Recoder(mapping),
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       new Recoder(mapping map { case (x, y) => (y, x) }))
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    }
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    def decode(text: String): String = decoder.recode(text)
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    def encode(text: String): String = encoder.recode(text)
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    private def recode_set(elems: String*): Set[String] =
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    {
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      val content = elems.toList
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      Set((content ::: content.map(decode)): _*)
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    }
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    private def recode_map[A](elems: (String, A)*): Map[String, A] =
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    {
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      val content = elems.toList
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      Map((content ::: content.map({ case (sym, a) => (decode(sym), a) })): _*)
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    }
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    /* user fonts */
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    val fonts: Map[String, String] =
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      recode_map((
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        for ((sym, props) <- symbols if props.isDefinedAt("font"))
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          yield (sym -> props("font"))): _*)
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    val font_names: List[String] = Set(fonts.toList.map(_._2): _*).toList
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    val font_index: Map[String, Int] = Map((font_names zip (0 until font_names.length).toList): _*)
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    def lookup_font(sym: String): Option[Int] = fonts.get(sym).map(font_index(_))
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    /* classification */
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    private val letters = recode_set(
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      "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M",
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      "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z",
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      "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m",
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      "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z",
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      "\\<A>", "\\<B>", "\\<C>", "\\<D>", "\\<E>", "\\<F>", "\\<G>",
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      "\\<H>", "\\<I>", "\\<J>", "\\<K>", "\\<L>", "\\<M>", "\\<N>",
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      "\\<O>", "\\<P>", "\\<Q>", "\\<R>", "\\<S>", "\\<T>", "\\<U>",
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      "\\<V>", "\\<W>", "\\<X>", "\\<Y>", "\\<Z>", "\\<a>", "\\<b>",
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      "\\<c>", "\\<d>", "\\<e>", "\\<f>", "\\<g>", "\\<h>", "\\<i>",
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      "\\<j>", "\\<k>", "\\<l>", "\\<m>", "\\<n>", "\\<o>", "\\<p>",
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      "\\<q>", "\\<r>", "\\<s>", "\\<t>", "\\<u>", "\\<v>", "\\<w>",
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   320
      "\\<x>", "\\<y>", "\\<z>",
d8d9df8407f6 added symbol classification;
wenzelm
parents: 34098
diff changeset
   321
d8d9df8407f6 added symbol classification;
wenzelm
parents: 34098
diff changeset
   322
      "\\<AA>", "\\<BB>", "\\<CC>", "\\<DD>", "\\<EE>", "\\<FF>",
d8d9df8407f6 added symbol classification;
wenzelm
parents: 34098
diff changeset
   323
      "\\<GG>", "\\<HH>", "\\<II>", "\\<JJ>", "\\<KK>", "\\<LL>",
d8d9df8407f6 added symbol classification;
wenzelm
parents: 34098
diff changeset
   324
      "\\<MM>", "\\<NN>", "\\<OO>", "\\<PP>", "\\<QQ>", "\\<RR>",
d8d9df8407f6 added symbol classification;
wenzelm
parents: 34098
diff changeset
   325
      "\\<SS>", "\\<TT>", "\\<UU>", "\\<VV>", "\\<WW>", "\\<XX>",
d8d9df8407f6 added symbol classification;
wenzelm
parents: 34098
diff changeset
   326
      "\\<YY>", "\\<ZZ>", "\\<aa>", "\\<bb>", "\\<cc>", "\\<dd>",
d8d9df8407f6 added symbol classification;
wenzelm
parents: 34098
diff changeset
   327
      "\\<ee>", "\\<ff>", "\\<gg>", "\\<hh>", "\\<ii>", "\\<jj>",
d8d9df8407f6 added symbol classification;
wenzelm
parents: 34098
diff changeset
   328
      "\\<kk>", "\\<ll>", "\\<mm>", "\\<nn>", "\\<oo>", "\\<pp>",
d8d9df8407f6 added symbol classification;
wenzelm
parents: 34098
diff changeset
   329
      "\\<qq>", "\\<rr>", "\\<ss>", "\\<tt>", "\\<uu>", "\\<vv>",
d8d9df8407f6 added symbol classification;
wenzelm
parents: 34098
diff changeset
   330
      "\\<ww>", "\\<xx>", "\\<yy>", "\\<zz>",
d8d9df8407f6 added symbol classification;
wenzelm
parents: 34098
diff changeset
   331
d8d9df8407f6 added symbol classification;
wenzelm
parents: 34098
diff changeset
   332
      "\\<alpha>", "\\<beta>", "\\<gamma>", "\\<delta>", "\\<epsilon>",
d8d9df8407f6 added symbol classification;
wenzelm
parents: 34098
diff changeset
   333
      "\\<zeta>", "\\<eta>", "\\<theta>", "\\<iota>", "\\<kappa>",
d8d9df8407f6 added symbol classification;
wenzelm
parents: 34098
diff changeset
   334
      "\\<mu>", "\\<nu>", "\\<xi>", "\\<pi>", "\\<rho>", "\\<sigma>",
d8d9df8407f6 added symbol classification;
wenzelm
parents: 34098
diff changeset
   335
      "\\<tau>", "\\<upsilon>", "\\<phi>", "\\<chi>", "\\<psi>",
d8d9df8407f6 added symbol classification;
wenzelm
parents: 34098
diff changeset
   336
      "\\<omega>", "\\<Gamma>", "\\<Delta>", "\\<Theta>", "\\<Lambda>",
d8d9df8407f6 added symbol classification;
wenzelm
parents: 34098
diff changeset
   337
      "\\<Xi>", "\\<Pi>", "\\<Sigma>", "\\<Upsilon>", "\\<Phi>",
d8d9df8407f6 added symbol classification;
wenzelm
parents: 34098
diff changeset
   338
      "\\<Psi>", "\\<Omega>",
d8d9df8407f6 added symbol classification;
wenzelm
parents: 34098
diff changeset
   339
d8d9df8407f6 added symbol classification;
wenzelm
parents: 34098
diff changeset
   340
      "\\<^isub>", "\\<^isup>")
d8d9df8407f6 added symbol classification;
wenzelm
parents: 34098
diff changeset
   341
34138
4008c2f5a46e refined some Symbol operations/signatures;
wenzelm
parents: 34137
diff changeset
   342
    private val blanks =
43490
5e6f76cacb93 more uniform treatment of recode_set/recode_map;
wenzelm
parents: 43489
diff changeset
   343
      recode_set(space, "\t", "\n", "\u000B", "\f", "\r", "\\<spacespace>", "\\<^newline>")
34138
4008c2f5a46e refined some Symbol operations/signatures;
wenzelm
parents: 34137
diff changeset
   344
4008c2f5a46e refined some Symbol operations/signatures;
wenzelm
parents: 34137
diff changeset
   345
    private val sym_chars =
4008c2f5a46e refined some Symbol operations/signatures;
wenzelm
parents: 34137
diff changeset
   346
      Set("!", "#", "$", "%", "&", "*", "+", "-", "/", "<", "=", ">", "?", "@", "^", "_", "|", "~")
34134
d8d9df8407f6 added symbol classification;
wenzelm
parents: 34098
diff changeset
   347
d8d9df8407f6 added symbol classification;
wenzelm
parents: 34098
diff changeset
   348
    def is_letter(sym: String): Boolean = letters.contains(sym)
34138
4008c2f5a46e refined some Symbol operations/signatures;
wenzelm
parents: 34137
diff changeset
   349
    def is_digit(sym: String): Boolean = sym.length == 1 && '0' <= sym(0) && sym(0) <= '9'
34134
d8d9df8407f6 added symbol classification;
wenzelm
parents: 34098
diff changeset
   350
    def is_quasi(sym: String): Boolean = sym == "_" || sym == "'"
34138
4008c2f5a46e refined some Symbol operations/signatures;
wenzelm
parents: 34137
diff changeset
   351
    def is_letdig(sym: String): Boolean = is_letter(sym) || is_digit(sym) || is_quasi(sym)
34134
d8d9df8407f6 added symbol classification;
wenzelm
parents: 34098
diff changeset
   352
    def is_blank(sym: String): Boolean = blanks.contains(sym)
34138
4008c2f5a46e refined some Symbol operations/signatures;
wenzelm
parents: 34137
diff changeset
   353
    def is_symbolic_char(sym: String): Boolean = sym_chars.contains(sym)
40523
1050315f6ee2 simplified/robustified treatment of malformed symbols, which are now fully internalized (total Symbol.explode etc.);
wenzelm
parents: 40522
diff changeset
   354
    def is_symbolic(sym: String): Boolean =
1050315f6ee2 simplified/robustified treatment of malformed symbols, which are now fully internalized (total Symbol.explode etc.);
wenzelm
parents: 40522
diff changeset
   355
      sym.startsWith("\\<") && sym.endsWith(">") && !sym.startsWith("\\<^")
43455
4b4b93672f15 some unicode chars for special control symbols;
wenzelm
parents: 43447
diff changeset
   356
4b4b93672f15 some unicode chars for special control symbols;
wenzelm
parents: 43447
diff changeset
   357
43488
39035276927c Symbol.is_ctrl: handle decoded version as well;
wenzelm
parents: 43487
diff changeset
   358
    /* control symbols */
39035276927c Symbol.is_ctrl: handle decoded version as well;
wenzelm
parents: 43487
diff changeset
   359
39035276927c Symbol.is_ctrl: handle decoded version as well;
wenzelm
parents: 43487
diff changeset
   360
    private val ctrl_decoded: Set[String] =
39035276927c Symbol.is_ctrl: handle decoded version as well;
wenzelm
parents: 43487
diff changeset
   361
      Set((for ((sym, _) <- symbols if sym.startsWith("\\<^")) yield decode(sym)): _*)
39035276927c Symbol.is_ctrl: handle decoded version as well;
wenzelm
parents: 43487
diff changeset
   362
39035276927c Symbol.is_ctrl: handle decoded version as well;
wenzelm
parents: 43487
diff changeset
   363
    def is_ctrl(sym: String): Boolean =
39035276927c Symbol.is_ctrl: handle decoded version as well;
wenzelm
parents: 43487
diff changeset
   364
      sym.startsWith("\\<^") || ctrl_decoded.contains(sym)
43455
4b4b93672f15 some unicode chars for special control symbols;
wenzelm
parents: 43447
diff changeset
   365
43443
5d9693c2337e basic support for extended syntax styles: sub/superscript;
wenzelm
parents: 43418
diff changeset
   366
    def is_controllable(sym: String): Boolean =
43488
39035276927c Symbol.is_ctrl: handle decoded version as well;
wenzelm
parents: 43487
diff changeset
   367
      !is_blank(sym) && !is_ctrl(sym) && !is_malformed(sym)
43455
4b4b93672f15 some unicode chars for special control symbols;
wenzelm
parents: 43447
diff changeset
   368
4b4b93672f15 some unicode chars for special control symbols;
wenzelm
parents: 43447
diff changeset
   369
    private val subscript_decoded = Set(decode("\\<^sub>"), decode("\\<^isub>"))
4b4b93672f15 some unicode chars for special control symbols;
wenzelm
parents: 43447
diff changeset
   370
    private val superscript_decoded = Set(decode("\\<^sup>"), decode("\\<^isup>"))
4b4b93672f15 some unicode chars for special control symbols;
wenzelm
parents: 43447
diff changeset
   371
    def is_subscript_decoded(sym: String): Boolean = subscript_decoded.contains(sym)
4b4b93672f15 some unicode chars for special control symbols;
wenzelm
parents: 43447
diff changeset
   372
    def is_superscript_decoded(sym: String): Boolean = superscript_decoded.contains(sym)
43511
d138e7482a1b clarified decoded control symbols;
wenzelm
parents: 43490
diff changeset
   373
d138e7482a1b clarified decoded control symbols;
wenzelm
parents: 43490
diff changeset
   374
    val bold_decoded = decode("\\<^bold>")
d138e7482a1b clarified decoded control symbols;
wenzelm
parents: 43490
diff changeset
   375
    val bsub_decoded = decode("\\<^bsub>")
d138e7482a1b clarified decoded control symbols;
wenzelm
parents: 43490
diff changeset
   376
    val esub_decoded = decode("\\<^esub>")
d138e7482a1b clarified decoded control symbols;
wenzelm
parents: 43490
diff changeset
   377
    val bsup_decoded = decode("\\<^bsup>")
d138e7482a1b clarified decoded control symbols;
wenzelm
parents: 43490
diff changeset
   378
    val esup_decoded = decode("\\<^esup>")
27918
85942d2036a0 reading symbol interpretation tables;
wenzelm
parents: 27905
diff changeset
   379
  }
27901
28083e9f8d1d Basic support for Isabelle symbols.
wenzelm
parents:
diff changeset
   380
}