// author: buraq
// This program generates the Product$i classes, where 0 <= i <+ MAXWIDTH
// usage: scala -classpath ... genprod PATH
// where PATH is the desired output directory
// $Id$
object genprod {
/** The biggest ?? has Sup?? - 1 components/arguments */
val SUP_PRODUCT_ARITY = 23
val SUP_TUPLE_ARITY = 9
val SUP_FUNCTION_ARITY = 9
def productClassname(i:Int) = "Product"+i
def productFilename(i:Int) = productClassname(i)+".scala"
def tupleClassname(i:Int) = "Tuple"+i
def tupleFilename(i:Int) = tupleClassname(i)+".scala"
def functionClassname(i:Int) = "Function"+i
def functionFilename(i:Int) = functionClassname(i)+".scala"
def targs(i:Int) =
for (val j <- List.range(1,i+1)) yield "T" + j
def covariantArgs(i:Int) =
for (val t <- targs(i)) yield "+" + t
def contraCoArgs(i:Int) =
(for (val t <- targs(i)) yield "-" + t):::List("+R")
def vdefs(i: Int) =
for (val j <- List.range(1,i+1)) yield "v" + j
def mdefs(i: Int) =
for (val j <- List.range(1,i+1)) yield "_" + j
def zippedAndCommaSeparated (left: List[String], right: List[String]): String = {
val sb = new StringBuffer()
val it = (left zip right).elements
def append1 = {
val p = it.next
sb.append(p._1).append(':').append(p._2)
}
if(it.hasNext) {
append1
while(it.hasNext) { sb.append(", "); append1 }
}
sb.toString
}
def fields (i:Int) = zippedAndCommaSeparated( mdefs(i), targs(i) )
def funArgs(i:Int) = zippedAndCommaSeparated( vdefs(i), targs(i) )
def productFiles =
for(val i <- List.range(0, SUP_PRODUCT_ARITY)) yield ProductFile.make(i) ;
def tupleFiles =
for(val i <- List.range(1, SUP_TUPLE_ARITY)) yield TupleFile.make(i);
def functionFiles =
for(val i <- List.range(0, SUP_FUNCTION_ARITY)) yield FunctionFile.make(i)
def allfiles =
productFiles ::: tupleFiles ::: functionFiles
def main(args:Array[String]) = {
if(args.length != 1) {
Console.println("please give path of output directory")
System.exit(-1)
}
import java.io.{ File, FileOutputStream }
import java.nio.channels.Channels
val out = args(0)
for(val node <- allfiles) {
val f = new File(out + File.separator + node.attributes("name"))
f.createNewFile
val fos = new FileOutputStream(f)
val c = fos.getChannel
val w = Channels.newWriter(c, "utf-8")
w.write(node.text)
w.close
}
}
}
/* zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
F U N C T I O N
zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz */
object FunctionFile {
import genprod._
def make(i: Int) = {
val __typeArgs__ = contraCoArgs(i).mkString("[",", ","]")
val __funArgs__ = funArgs(i)
<file name={functionFilename(i)}>
/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2002-2006, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
// generated on {new java.util.Date().toString()} {if(descriptiveComment(i).length > 0) "(with fancy comment)" else ""} {if(moreMethods(i).length > 0) "(with extra methods)" else ""}
// $Id$
package scala
/**
* Function with {i} parameters. {DescriptiveComment.forFunction(i)}
*/
trait {functionClassname(i)} {__typeArgs__} extends AnyRef {{
def apply({__funArgs__}): R
override def toString() = "<function>"
{moreMethods(i)}
}}
</file>
}
def moreMethods(i:Int) = i match {
case 1 => """
def compose[A](g: A => T1): A => R = { x => apply(g(x)) }
def andThen[A](g: R => A): T1 => A = g compose this
"""
case _ => ""
}
def descriptiveComment(i:Int) = i match {
case 0 => """In the following example the definition of
* <code>currentSeconds</code> is a shorthand for the anonymous class
* definition <code>anonfun0</code>:
* <pre>
* <b>object</b> Main <b>extends</b> Application {
*
* <b>val</b> currentSeconds = () => System.currentTimeMillis() / 1000L
*
* <b>val</b> anonfun0 = <b>new</b> Function0[Long] {
* <b>def</b> apply(): Long = System.currentTimeMillis() / 1000L
* }
*
* Console.println(currentSeconds())
* Console.println(anonfun0())
* }</pre>"""
case 1 => """In the following example the definition of
* <code>succ</code> is a shorthand for the anonymous class definition
* <code>anonfun1</code>:
* <pre>
* <b>object</b> Main <b>extends</b> Application {
*
* <b>val</b> succ = (x: Int) => x + 1
*
* <b>val</b> anonfun1 = <b>new</b> Function1[Int, Int] {
* <b>def</b> apply(x: Int): Int = x + 1
* }
*
* Console.println(succ(0))
* Console.println(anonfun1(0))
* }</pre>"""
case 2 => """In the following example the definition of
* <code>max</code> is a shorthand for the anonymous class definition
* <code>anonfun2</code>:
* <pre>
* <b>object</b> Main <b>extends</b> Application {
*
* <b>val</b> max = (x: Int, y: Int) => <b>if</b> (x < y) y <b>else</b> x
*
* <b>val</b> anonfun2 = <b>new</b> Function2[Int, Int, Int] {
* <b>def</b> apply(x: Int, y: Int): Int = <b>if</b> (x < y) y <b>else</b> x
* }
*
* Console.println(max(0, 1))
* Console.println(anonfun2(0, 1))
* }</pre>"""
case _ => ""
}
} // object FunctionFile
/* zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
T U P L E
zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz */
object TupleFile {
import genprod._
def make(i: Int) = {
val __typeArgs__ = covariantArgs(i).mkString("[",", ","]")
val __fields__ = fields(i)
<file name={tupleFilename(i)}>
/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2002-2006, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
// $Id$
// generated on {new java.util.Date().toString()}
package scala;
/** {tupleClassname(i)} is the canonical representation of a @see {productClassname(i)} */
case class {tupleClassname(i)} {__typeArgs__} ({ __fields__ }) {{
override def productPrefix = ""
}}
</file>
}
} // object TupleFile
/* zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
P R O D U C T
zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz */
object ProductFile {
import genprod._
def make(i:Int) = {
val __typeArgs__ = if(i==0) Nil else covariantArgs(i).mkString("[",", ","]")
<file name={productFilename(i)}>
/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2002-2006, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
// generated on {new java.util.Date().toString()}
package scala
import Predef._
/** {productClassname(i)} is a cartesian product of {i} components
*/
trait {productClassname(i)} {__typeArgs__} extends Product {{
/**
* The arity of this product.
* @return {i}
*/
override def arity = {i}
/**
* Returns the n-th projection of this product if 0<n<=arity, otherwise null
* @param n number of the projection to be returned
* @throws IndexOutOfBoundsException
*/
override def element(n: Int) = n match {{
{for(val Tuple2(m,j) <- mdefs(i).zip(List.range(1,i+1)))
yield "case "+j+" => "+m+"\n "}case _ => throw new IndexOutOfBoundsException(n.toString())
}}
{for(val Tuple2(m,t) <- mdefs(i) zip targs(i)) yield
"/** projection of this product */\n def "+m+":"+t+"\n\n " }
}}
</file>
}
}
