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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2003-2004, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
** $Id$
\* */
package scala.tools.nsc.util;
/** This position uses offset in character buffer rather than line column relationship.
* @author Sean McDirmid
*/
object Position {
val NOPOS = -1;
val FIRSTPOS = 0;
val NOLINE = 0;
val FIRSTLINE = 1;
def line(source : SourceFile, offset : Int) = (new Position(source, offset)).line;
def lineToOffset(line : Int) = {
assert(line >= 1);
NOPOS - line;
}
def offsetToLine(pos : Int) = {
assert(pos < NOPOS);
NOPOS - pos;
}
}
class Position( val source : SourceFile, val offset: Int) {
import Position._;
private val tabInc = 8;
def this(sourceName : String) = this(new SourceFile(sourceName, new Array[Char](0)), Position.NOPOS);
def this(sourceName : String, _offset : Int) = this(new SourceFile(sourceName, new Array[Char](0)), _offset);
private def hasOffset = offset > NOPOS;
private def isLine = offset < NOPOS;
def line: Int =
if (hasOffset) source.offsetToLine(offset) + FIRSTLINE
else if (isLine) Position.offsetToLine(offset) else NOLINE;
// for display purposes only.
def column: Int = if (hasOffset) {
var column = 1;
// find beginning offset for line
val line = source.offsetToLine (offset);
var coffset = source. lineToOffset(line);
var continue = true;
while (continue) {
if (coffset == offset) continue = false;
else if (source.content(coffset) == '\t') column = ((column - 1) / tabInc * tabInc) + tabInc + 1;
else column = column + 1;
coffset = coffset + 1;
}
column;
} else 0;
def dbgString = {
"source: " + (if (source == null) source else source . path) + " " +
(if (isLine) "line-" + line;
else if (!hasOffset) "NOP";
else if (offset >= source.content.length) "out-of-bounds-" + offset else {
val ret = "offset=" + offset + " line=" + line;
var add = "";
while (offset + add.length() < source.content.length &&
add.length() < 10) add = add + source.content(offset + add.length());
ret + " c[0..9]=\"" + add + "\"";
})
}
def lineContent: String = if (hasOffset) source.lineToString(line - FIRSTLINE) else "NO_LINE";
/** Returns a string representation of the encoded position. */
override def toString(): String = {
val sb = new StringBuffer();
if (source != null) {
sb.append(source.file.getPath());
if (hasOffset) {
sb.append(line);
sb.append(':');
sb.append(column);
}
} else sb.append("::" + offset);
sb.toString();
}
}
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