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UTILITY.JS
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1997-10-22
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/* ==================================================================
FILE: Utility.js
DESCR: Misc. global APIs.
NOTES:
================================================================== */
/*
DESCR: Does non-case-sensitive comparison for equality of two URLS,
using only the portion beginning with the filename.
PARAMS: URL1_, URL2_ The URLs.
RETURNS: True if equal, false otherwise.
NOTES: Not applicable to nethelp: URLs. Also requires that any fragment
specifier attached to the URLs does not contain "/".
*/
function URLsSansPathsAreSame( URL1_, URL2_ )
{
// Standardize case.
var URL1 = URL1_.toUpperCase()
var URL2 = URL2_.toUpperCase()
// Remove any path.
URL1 = URL1.substring( URL1.lastIndexOf( "/" ) + 1 )
URL2 = URL2.substring( URL2.lastIndexOf( "/" ) + 1 )
// Compare.
return ( URL1 == URL2 )
}
/*
DESCR: Converts a URL to a simple filename (no path, no trailing
specifiers).
PARAMS: URL The URL.
RETURNS: The converted URL.
NOTES: Not applicable to nethelp: URLs. Also requires that any fragment
specifier attached to the URLs does not contain "/".
*/
function makeSimpleFilename( URL )
{
var filename
// Standardize case.
filename = URL.toLowerCase()
// Remove any path.
filename = filename.substring( filename.lastIndexOf( "/" ) + 1 )
// Remove any specifiers.
if ( filename.indexOf( "#" ) > 0 ) {
filename = filename.substring( 0, filename.indexOf( "#" ) )
}
if ( filename.indexOf( "?" ) > 0 ) {
filename = filename.substring( 0, filename.indexOf( "?" ) )
}
return filename
}
/*
DESCR: Runtime error handler.
PARAMS: Standard JS event params.
RETURNS: Boolean to optionally supress runtime error dialogs.
NOTES: If ERRS_TO_CONSOLE is ture, sends JS runtime errors to console for
any window that binds this handler. If ERR_DLGS is true, error
dialogs will not be supressed.
*/
function errHandler( msg, URL, lineNum )
{
if ( ERRS_TO_CONSOLE ) {
// Report error to console.
java.lang.System.out.println( "" )
java.lang.System.out.println( "Error:" )
java.lang.System.out.println( msg )
java.lang.System.out.println( URL )
java.lang.System.out.println( lineNum )
java.lang.System.out.println( "" )
}
// Allow or supress runtime error dialogs.
return ( ERR_DLGS ? false : true )
}
/*
DESCR: Assertion routine.
PARAMS: bAssertion Boolean expression.
msg Fail message.
RETURNS:
NOTES: Must define ASSERT = true in any module using this routine.
*/
function assert( bAssertion, msg )
{
if ( ASSERT && !bAssertion ) alert( "ASSERTION FAILED: " + msg )
}
/*
DESCR: Determines if a variable has been defined.
PARAMS: identifier The identifier to test.
RETURNS: true if the identifier is defined; false otherwise.
NOTES:
*/
function defined( identifier )
{
return ( typeof identifier == "undefined" ? false : true )
}