src/Pure/General/symbol.scala
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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 java.util.regex.Pattern
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import java.io.File
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import scala.io.Source
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import scala.collection.jcl.HashMap
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object Symbol {
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  /** Symbol regexps **/
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  private def compile(s: String) =
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    Pattern.compile(s, Pattern.COMMENTS | Pattern.DOTALL)
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  private val plain_pattern = compile(""" [^\\ \ud800-\udfff] | [\ud800-\udbff][\udc00-\udfff] """)
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  private val symbol_pattern = compile(""" \\ \\? < (?:
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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 bad_symbol_pattern = compile("(?!" + symbol_pattern + ")" +
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    """ \\ \\? < (?: (?! \s | [\"`\\] | \(\* | \*\) | \{\* | \*\} ) . )*""")
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  // total pattern
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  val pattern = compile(plain_pattern + "|" + symbol_pattern + "|" + bad_symbol_pattern + "| .")
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  /** Recoding **/
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  private class Recoder(list: List[(String, String)]) {
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    private val (min, max) = {
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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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      val table = new HashMap[String, String]
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      for ((x, y) <- list) table + (x -> y)
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      table
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    }
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    def recode(text: String) = {
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      val len = text.length
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      val matcher = 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)
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          matcher.lookingAt
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          val x = matcher.group
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          table.get(x) match {
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            case Some(y) => result.append(y)
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            case None => result.append(x)
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          }
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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 {
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    private var symbols = new HashMap[String, HashMap[String, String]]
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    private var decoder: Recoder = null
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    private var encoder: Recoder = null
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    def decode(text: String) = decoder.recode(text)
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    def encode(text: String) = encoder.recode(text)
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    /* read symbols */
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    private val empty_pattern = compile(""" ^\s* (?: \#.* )? $ """)
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    private val blank_pattern = compile(""" \s+ """)
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    private val key_pattern = compile(""" (.+): """)
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    private def read_line(line: String) = {
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      def err() = error("Bad symbol specification (line " + line + ")")
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      def read_props(props: List[String], tab: HashMap[String, String]): Unit = {
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        props match {
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          case Nil => ()
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          case _ :: Nil => err()
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          case key :: value :: rest => {
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            val key_matcher = key_pattern.matcher(key)
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            if (key_matcher.matches) {
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              tab + (key_matcher.group(1) -> value)
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              read_props(rest, tab)
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            }
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            else err ()
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          }
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        }
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      }
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      if (!empty_pattern.matcher(line).matches) {
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        blank_pattern.split(line).toList match {
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          case Nil => err()
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          case symbol :: props => {
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            val tab = new HashMap[String, String]
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            read_props(props, tab)
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            symbols + (symbol -> tab)
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          }
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        }
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      }
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    }
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    private def read_symbols(path: String) = {
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      val file = new File(IsabelleSystem.platform_path(path))
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      if (file.canRead) {
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        for (line <- Source.fromFile(file).getLines) read_line(line)
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      }
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    }
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    /* init tables */
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    private def get_code(entry: (String, HashMap[String, String])) = {
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      val (symbol, props) = entry
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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 " + symbol)
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          case _: NumberFormatException => error("Bad code for symbol " + symbol)
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        }
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      (symbol, new String(Character.toChars(code)))
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    }
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    private def init_recoders() = {
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      val list = symbols.elements.toList.map(get_code)
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      decoder = new Recoder(list ++ (for ((x, y) <- list) yield ("\\" + x, y)))
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      encoder = new Recoder(for ((x, y) <- list) yield (y, x))
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    }
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    /* constructor */
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68d40072e9e7 read_symbols: proper IsabelleSystem.platform_path;
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    read_symbols("$ISABELLE_HOME/etc/symbols")
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    read_symbols("$ISABELLE_HOME_USER/etc/symbols")
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    init_recoders()
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85942d2036a0 reading symbol interpretation tables;
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  }
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}