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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2003-2006, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
// $Id$
package scala
import java.io.{InputStream, Reader, InputStreamReader, BufferedReader}
import java.io.{OutputStream, PrintStream}
import java.text.MessageFormat
import scala.util.Fluid
/** The <code>Console</code> object implements functionality for
* printing Scala values on the terminal. There are also functions
* for reading specific values. <code>Console</code> also defines
* constants for marking up text on ANSI terminals.
*
* @author Matthias Zenger
* @version 1.0, 03/09/2003
*/
object Console {
// ANSI colors foreground
final val BLACK = "\033[30m"
final val RED = "\033[31m"
final val GREEN = "\033[32m"
final val YELLOW = "\033[33m"
final val BLUE = "\033[34m"
final val MAGENTA = "\033[35m"
final val CYAN = "\033[36m"
final val WHITE = "\033[37m"
// ANSI colors background
final val BLACK_B = "\033[40m"
final val RED_B = "\033[41m"
final val GREEN_B = "\033[42m"
final val YELLOW_B = "\033[43m"
final val BLUE_B = "\033[44m"
final val MAGENTA_B = "\033[45m"
final val CYAN_B = "\033[46m"
final val WHITE_B = "\033[47m"
// ANSI styles
final val RESET = "\033[0m"
final val BOLD = "\033[1m"
final val UNDERLINED = "\033[4m"
final val BLINK = "\033[5m"
final val REVERSED = "\033[7m"
final val INVISIBLE = "\033[8m"
private val outFluid = new Fluid[PrintStream](java.lang.System.out)
private val inFluid = new Fluid[BufferedReader](
new BufferedReader(new InputStreamReader(java.lang.System.in)))
def out = outFluid.value
def in = inFluid.value
val err = java.lang.System.err
/** Set the default output stream.
*
* @param out the new output stream.
*/
def setOut(out: PrintStream): Unit = outFluid.value = out
/** Set the default output stream for the duration
* of execution of one thunk.
*
* @param out the new output stream.
* @param thunk the code to execute with
* the new output stream active
* @return ...
*/
def withOut[T](out: PrintStream)(thunk: =>T): T =
outFluid.withValue(out)(thunk)
/** Set the default output stream.
*
* @param@ out the new output stream.
*/
def setOut(out: OutputStream): Unit =
setOut(new PrintStream(out))
/** Set the default output stream for the duration
* of execution of one thunk.
*
* @param out the new output stream.
* @param thunk the code to execute with
* the new output stream active
* @return ...
*/
def withOut[T](out: OutputStream)(thunk: =>T): T =
withOut(new PrintStream(out))(thunk)
/** Set the default input stream.
*
* @param reader specifies the new input stream.
*/
def setIn(reader: Reader): Unit = {
inFluid.value = new BufferedReader(reader)
}
/** Set the default input stream for the duration
* of execution of one thunk.
*
* @param in the new input stream.
* @param thunk the code to execute with
* the new input stream active
*/
def withIn[T](reader: Reader)(thunk: =>T): T =
inFluid.withValue(new BufferedReader(reader))(thunk)
/** Set the default input stream.
*
* @param in the new input stream.
*/
def setIn(in: InputStream): Unit =
setIn(new InputStreamReader(in))
/** Set the default input stream for the duration
* of execution of one thunk.
*
* @param in the new input stream.
* @param thunk the code to execute with
* the new input stream active
*/
def withIn[T](in: InputStream)(thunk: =>T): T =
withIn(new InputStreamReader(in))(thunk)
/** Print an object on the terminal.
*
* @param obj the object to print.
*/
def print(obj: Any): Unit =
out.print(if (null == obj) "null" else obj.toString())
/** Flush the output stream. This function is required when partial
* output (i.e. output not terminated by a new line character) has
* to be made visible on the terminal.
*/
def flush: Unit = out.flush()
/** Print a new line character on the terminal.
*/
def println: Unit = out.println()
/** Print out an object followed by a new line character.
*
* @param x the object to print.
*/
def println(x: Any): Unit = out.println(x)
/** Format and print out some text (in a fashion similar to printf in C).
* The format of the text to print is specified by the parameter
* <code>text</code>. The arguments that are inserted into specific
* locations in <code>text</code> are provided with parameter
* <code>args</code>. See class <code>java.text.MessageFormat</code>
* for a full specification of the format syntax.
*
* @param text the format of the text to print out.
* @param args the parameters used to instantiate the format.
*/
// todo: Uncurry
def printf(text: String)(args: Any*): Unit =
out.print(
if (text eq null) "null"
else MessageFormat.format(text, textParams(args))
)
/** Read a full line from the terminal.
*
* @return the string read from the terminal.
*/
def readLine: String = in.readLine()
/** Read a boolean value from the terminal.
*
* @return the boolean value read from the terminal.
*/
def readBoolean: Boolean = in.readLine().toLowerCase() match {
case "true" => true
case "t" => true
case "yes" => true
case "y" => true
case _ => false
}
/** Read a byte value from the terminal.
*/
def readByte: Byte = readLine.toByte
/** Read a short value from the terminal.
*/
def readShort: Short = readLine.toByte
/** Read a char value from the terminal.
*/
def readChar: Char = readLine charAt 0
/** Read an int value from the terminal.
*/
def readInt: Int = readLine.toInt
/** Read a float value from the terminal.
*/
def readFloat: Float = readLine.toFloat
/** Read a double value from the terminal.
*/
def readDouble: Double = readLine.toDouble
/** Read in some structured input, specified by a format specifier.
* See class <code>java.text.MessageFormat</code> for details of
* the format specification.
*
* @param format the format of the input.
* @return a list of all extracted values.
*/
def readf(format: String): List[Any] =
textComponents(new MessageFormat(format).parse(in.readLine()))
/** Read in some structured input, specified by a format specifier.
* Opposed to <code>readf</code>, this function only returns the
* first value extracted from the input according to the format
* specification.
*
* @param format ...
* @return ...
*/
def readf1(format: String): Any = readf(format).head
/** Read in some structured input, specified by a format specifier.
* Opposed to <code>readf</code>, this function only returns the
* first two values extracted from the input according to the format
* specification.
*
* @param format ...
* @return ...
*/
def readf2(format: String): Pair[Any, Any] = {
val res = readf(format)
Pair(res.head, res.tail.head)
}
/** Read in some structured input, specified by a format specifier.
* Opposed to <code>readf</code>, this function only returns the
* first three values extracted from the input according to the format
* specification.
*
* @param format ...
* @return ...
*/
def readf3(format: String): Triple[Any, Any, Any] = {
val res = readf(format)
Triple(res.head, res.tail.head, res.tail.tail.head)
}
private def textComponents(a: Array[AnyRef]): List[Any] = {
var i: Int = a.length - 1
var res: List[Any] = Nil
while (i >= 0) {
res = (a(i) match {
case x: java.lang.Boolean => x.booleanValue()
case x: java.lang.Byte => x.byteValue()
case x: java.lang.Short => x.shortValue()
case x: java.lang.Character => x.charValue()
case x: java.lang.Integer => x.intValue()
case x: java.lang.Long => x.longValue()
case x: java.lang.Float => x.floatValue()
case x: java.lang.Double => x.doubleValue()
case x => x
}) :: res;
i = i - 1
}
res
}
private def textParams(s: Seq[Any]): Array[AnyRef] = {
val res = new Array[AnyRef](s.length);
var i: Int = 0;
val iter = s.elements;
while (iter.hasNext) {
res(i) = iter.next match {
case x: Boolean => new java.lang.Boolean(x)
case x: Byte => new java.lang.Byte(x)
case x: Short => new java.lang.Short(x)
case x: Char => new java.lang.Character(x)
case x: Int => new java.lang.Integer(x)
case x: Long => new java.lang.Long(x)
case x: Float => new java.lang.Float(x)
case x: Double => new java.lang.Double(x)
case x: Unit => "()"
case x: AnyRef => x
}
i = i + 1
}
res
}
}
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