author | wenzelm |
Tue, 06 May 2014 23:35:24 +0200 | |
changeset 56888 | 3e8cbb624cc5 |
parent 56843 | b2bfcd8cda80 |
child 57831 | 885888a880fb |
permissions | -rw-r--r-- |
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/* Title: Pure/library.scala |
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Module: PIDE |
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Author: Makarius |
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Basic library. |
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*/ |
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package isabelle |
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import scala.collection.mutable |
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object Library |
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{ |
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/* user errors */ |
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object ERROR |
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{ |
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def apply(message: String): Throwable = new RuntimeException(message) |
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def unapply(exn: Throwable): Option[String] = Exn.user_message(exn) |
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} |
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def error(message: String): Nothing = throw ERROR(message) |
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def cat_message(msg1: String, msg2: String): String = |
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if (msg1 == "") msg2 |
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else msg1 + "\n" + msg2 |
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def cat_error(msg1: String, msg2: String): Nothing = |
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error(cat_message(msg1, msg2)) |
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/* separated chunks */ |
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def separate[A](s: A, list: List[A]): List[A] = |
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{ |
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val result = new mutable.ListBuffer[A] |
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var first = true |
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for (x <- list) { |
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if (first) { |
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first = false |
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result += x |
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} |
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else { |
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result += s |
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result += x |
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} |
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} |
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result.toList |
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} |
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def separated_chunks(sep: Char => Boolean, source: CharSequence): Iterator[CharSequence] = |
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new Iterator[CharSequence] { |
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private val end = source.length |
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private def next_chunk(i: Int): Option[(CharSequence, Int)] = |
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{ |
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if (i < end) { |
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var j = i; do j += 1 while (j < end && !sep(source.charAt(j))) |
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Some((source.subSequence(i + 1, j), j)) |
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} |
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else None |
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} |
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private var state: Option[(CharSequence, Int)] = if (end == 0) None else next_chunk(-1) |
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def hasNext(): Boolean = state.isDefined |
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def next(): CharSequence = |
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state match { |
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case Some((s, i)) => { state = next_chunk(i); s } |
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case None => Iterator.empty.next() |
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} |
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} |
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def space_explode(sep: Char, str: String): List[String] = |
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separated_chunks(_ == sep, str).map(_.toString).toList |
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/* lines */ |
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def terminate_lines(lines: Iterable[CharSequence]): Iterable[CharSequence] = |
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new Iterable[CharSequence] { |
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def iterator: Iterator[CharSequence] = |
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lines.iterator.map(line => new Line_Termination(line)) |
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} |
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def cat_lines(lines: TraversableOnce[String]): String = lines.mkString("\n") |
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def split_lines(str: String): List[String] = space_explode('\n', str) |
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def first_line(source: CharSequence): String = |
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{ |
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val lines = separated_chunks(_ == '\n', source) |
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if (lines.hasNext) lines.next.toString |
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else "" |
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} |
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/* strings */ |
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def try_unprefix(prfx: String, s: String): Option[String] = |
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if (s.startsWith(prfx)) Some(s.substring(prfx.length)) else None |
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def try_unsuffix(sffx: String, s: String): Option[String] = |
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if (s.endsWith(sffx)) Some(s.substring(0, s.length - sffx.length)) else None |
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def trim_line(s: String): String = |
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if (s.endsWith("\r\n")) s.substring(0, s.length - 2) |
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else if (s.endsWith("\r") || s.endsWith("\n")) s.substring(0, s.length - 1) |
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else s |
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/* quote */ |
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def quote(s: String): String = "\"" + s + "\"" |
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def try_unquote(s: String): Option[String] = |
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if (s.startsWith("\"") && s.endsWith("\"")) Some(s.substring(1, s.length - 1)) |
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else None |
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def commas(ss: Iterable[String]): String = ss.iterator.mkString(", ") |
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def commas_quote(ss: Iterable[String]): String = ss.iterator.map(quote).mkString(", ") |
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/* CharSequence */ |
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class Reverse(text: CharSequence, start: Int, end: Int) extends CharSequence |
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{ |
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require(0 <= start && start <= end && end <= text.length) |
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def this(text: CharSequence) = this(text, 0, text.length) |
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def length: Int = end - start |
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def charAt(i: Int): Char = text.charAt(end - i - 1) |
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def subSequence(i: Int, j: Int): CharSequence = |
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if (0 <= i && i <= j && j <= length) new Reverse(text, end - j, end - i) |
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else throw new IndexOutOfBoundsException |
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override def toString: String = |
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{ |
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val buf = new StringBuilder(length) |
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for (i <- 0 until length) |
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buf.append(charAt(i)) |
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buf.toString |
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} |
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} |
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class Line_Termination(text: CharSequence) extends CharSequence |
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{ |
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def length: Int = text.length + 1 |
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def charAt(i: Int): Char = if (i == text.length) '\n' else text.charAt(i) |
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def subSequence(i: Int, j: Int): CharSequence = |
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if (j == text.length + 1) new Line_Termination(text.subSequence(i, j - 1)) |
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else text.subSequence(i, j) |
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override def toString: String = text.toString + "\n" |
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} |
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/* canonical list operations */ |
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def member[A, B](xs: List[A])(x: B): Boolean = xs.exists(_ == x) |
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def insert[A](x: A)(xs: List[A]): List[A] = if (xs.contains(x)) xs else x :: xs |
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def remove[A, B](x: B)(xs: List[A]): List[A] = if (member(xs)(x)) xs.filterNot(_ == x) else xs |
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def update[A](x: A)(xs: List[A]): List[A] = x :: remove(x)(xs) |
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} |
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class Basic_Library |
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{ |
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val ERROR = Library.ERROR |
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val error = Library.error _ |
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val cat_error = Library.cat_error _ |
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val space_explode = Library.space_explode _ |
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val split_lines = Library.split_lines _ |
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val cat_lines = Library.cat_lines _ |
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val quote = Library.quote _ |
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val commas = Library.commas _ |
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val commas_quote = Library.commas_quote _ |
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} |