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Freelog 112
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FreelogNo112-NovembreDecembre2012.iso
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Songbird
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Songbird_2.0.0-2311_windows-i686-msvc8.exe
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components
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sbColumnSpecParser.jsm
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2012-06-08
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341 lines
/*
*=BEGIN SONGBIRD GPL
*
* This file is part of the Songbird web player.
*
* Copyright(c) 2005-2010 POTI, Inc.
* http://www.songbirdnest.com
*
* This file may be licensed under the terms of of the
* GNU General Public License Version 2 (the ``GPL'').
*
* Software distributed under the License is distributed
* on an ``AS IS'' basis, WITHOUT WARRANTY OF ANY KIND, either
* express or implied. See the GPL for the specific language
* governing rights and limitations.
*
* You should have received a copy of the GPL along with this
* program. If not, go to http://www.gnu.org/licenses/gpl.html
* or write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*=END SONGBIRD GPL
*/
Components.utils.import("resource://app/jsmodules/sbProperties.jsm");
EXPORTED_SYMBOLS = ["ColumnSpecParser"];
const Cc = Components.classes;
const Ci = Components.interfaces;
// FUEL is not built-in in JSMs
__defineGetter__("Application", function() {
delete Application;
Application = Cc["@mozilla.org/fuel/application;1"]
.getService(Ci.fuelIApplication);
return Application;
})
/**
* Construct a column spec parser and read the column specification immediately
*
* @param aMediaList The media list to find columns to display for
* @param aPlaylist the playlist binding
* @param aMask a bitfield containing the source to look for; see the
* ColumnSpecParser.ORIGIN_* constants
* @param [optional] aConstraint the media type constraint to use, if any
*/
function ColumnSpecParser(aMediaList, aPlaylist, aMask, aConstraint) {
if (!aMask) {
aMask = ~0 >>> 0;
}
// Our new "column spec" is a whitespace separated string that looks like
// this:
//
// "propertyID [20] [a] propertyID [40] [d]"
//
// The width and sort direction are optional.
// Try to get this info from the following places:
// 1: "columnSpec+(constraint)" property on the media list
// 2: if a constraint is given, preference indicated by
// XUL "useColumnSpecPreference" attribute
// 3: "defaultColumnSpec+(constraint)" property on the medialist
// 4: "columnSpec+(constraint)" property on the medialist library
// 5: "defaultColumnSpec+(constraint)" property on the medialist library
// 6: "columnSpec" property on the medialist
// 7: Preference indicated by XUL "useColumnSpecPreference" attribute
// 8: "defaultColumnSpec" property on the medialist
// 9: "columnSpec" property on the medialist library
// 10: "defaultColumnSpec" property on the medialist library
// 11: XUL "columnSpec" attribute
// 12: Our last-ditch hardcoded list
// use a function so we can do early returns from it
var self = this;
function getColumns() {
var cols = null;
/**
* check for a column spec, with a given constraint
* @param aPossibleConstraint the constraint to use; may be empty string
* to look for a column spec with no constraints
* @param aFlag the flag to be added to the column spec origin
* @return the parsed column spec, or null if not found
*/
function checkWithConstraint(aPossibleConstraint, aFlag) {
if (aMask & self.ORIGIN_PROPERTY) {
let prop = aMediaList.getProperty(SBProperties.columnSpec +
aPossibleConstraint);
cols = self._getColumnMap(prop, self.ORIGIN_PROPERTY | aFlag);
if (cols && cols.columnMap.length) {
return cols;
}
}
// we explicitly do not want to support using constraints with attributes
// hence we also don't add the flag, since no constraint would be used
if (aMask & self.ORIGIN_PREFERENCES) {
if (aPlaylist && aPlaylist.hasAttribute("useColumnSpecPreference")) {
let pref = aPlaylist.getAttribute("useColumnSpecPreference");
cols = self._getColumnMap(Application.prefs.getValue(pref, null),
self.ORIGIN_PREFERENCES);
if (cols && cols.columnMap.length) {
return cols;
}
}
}
if (aMask & self.ORIGIN_MEDIALISTDEFAULT) {
let prop = aMediaList.getProperty(SBProperties.defaultColumnSpec +
aPossibleConstraint);
cols = self._getColumnMap(prop, self.ORIGIN_MEDIALISTDEFAULT | aFlag);
if (cols && cols.columnMap.length) {
return cols;
}
}
if (aMask & self.ORIGIN_LIBRARY) {
let prop = aMediaList.library
.getProperty(SBProperties.columnSpec +
aPossibleConstraint)
cols = self._getColumnMap(prop, self.ORIGIN_LIBRARY | aFlag);
if (cols && cols.columnMap.length) {
return cols;
}
}
if (aMask & self.ORIGIN_LIBRARYDEFAULT) {
let prop = aMediaList.library
.getProperty(SBProperties.defaultColumnSpec +
aPossibleConstraint);
cols = self._getColumnMap(prop, self.ORIGIN_LIBRARYDEFAULT | aFlag);
if (cols && cols.columnMap.length) {
return cols;
}
}
return null;
}
if (aConstraint) {
cols = checkWithConstraint("+(" + aConstraint + ")",
self.ORIGIN_ONLY_CONSTRAINT);
if (cols && cols.columnMap.length) {
return cols;
}
}
cols = checkWithConstraint("", 0);
if (cols && cols.columnMap.length) {
return cols;
}
if (aMask & self.ORIGIN_ATTRIBUTE) {
if (aPlaylist) {
cols = self._getColumnMap(aPlaylist.getAttribute("columnSpec"),
self.ORIGIN_ATTRIBUTE);
}
if (cols && cols.columnMap.length) {
return cols;
}
}
// nope, can't find anything at all; use hard coded fallback
switch (aConstraint) {
case "video":
return self._getColumnMap([SBProperties.trackName, 229, "a",
SBProperties.duration, 45,
SBProperties.genre, 101,
SBProperties.year, 45,
SBProperties.rating, 90,
SBProperties.comment, 291,
].join(" "),
self.ORIGIN_DEFAULT);
// Show the source column by default except for video
default:
return self._getColumnMap([SBProperties.trackName, 229,
SBProperties.duration, 45,
SBProperties.artistName, 137, "a",
SBProperties.albumName, 210,
SBProperties.genre, 90,
SBProperties.rating, 90,
SBProperties.trackType, 78,
].join(" "),
self.ORIGIN_DEFAULT);
}
}
var columns = getColumns();
if (!columns || !columns.columnMap.length) {
throw new Error("Couldn't get columnMap!");
}
this._columns = columns;
}
ColumnSpecParser.prototype = {
_columns: null,
_columnSpecOrigin: null,
ORIGIN_PROPERTY: 1 << 0,
ORIGIN_PREFERENCES: 1 << 1,
ORIGIN_MEDIALISTDEFAULT: 1 << 2,
ORIGIN_LIBRARYDEFAULT: 1 << 3,
ORIGIN_LIBRARY: 1 << 4,
ORIGIN_ATTRIBUTE: 1 << 5,
ORIGIN_DEFAULT: 1 << 6,
// add this bit mask to enable only column spec sources that depend on the
// constraint given
ORIGIN_ONLY_CONSTRAINT: 1 << 31,
get columnMap() {
return this._columns.columnMap;
},
get origin() {
return this._columnSpecOrigin;
},
get sortID() {
return this._columns.sortID;
},
get sortIsAscending() {
return this._columns.sortIsAscending;
},
_getColumnMap: function(columnSpec, columnSpecOrigin) {
var columns = {
columnMap: [],
sortID: null,
sortIsAscending: null
}
if (columnSpec) {
try {
columns = ColumnSpecParser.parseColumnSpec(columnSpec);
this._columnSpecOrigin = columnSpecOrigin;
}
catch (e) {
Components.utils.reportError(e);
}
}
return columns;
}
}
ColumnSpecParser.parseColumnSpec = function(spec) {
var sortID;
var sortIsAscending;
// strip leading and trailing whitespace.
var strippedSpec = spec.match(/^\s*(.*?)\s*$/);
if (!strippedSpec.length > 0)
throw new Error("RegEx failed to match string");
// split based on whitespace.
var tokens = strippedSpec[1].split(/\s+/);
var columns = [];
var columnIndex = -1;
var seenSort = false;
for (var index = 0; index < tokens.length; index++) {
var token = tokens[index];
if (!token)
throw new Error("Zero-length token");
if (isNaN(parseInt(token))) {
if (token.length == 1 && (token == "a" || token == "d")) {
// This is a sort specifier
if (columnIndex < 0) {
throw new Error("You passed in a bunk string!");
}
// Multiple sorts will be ignored!
if (!seenSort) {
var column = columns[columnIndex];
column.sort = token == "a" ? "ascending" : "descending";
seenSort = true;
sortID = column.property;
sortIsAscending = token == "a";
}
}
else {
// This is a property name.
columns[++columnIndex] = { property: token, sort: null };
}
}
else {
// This is a width specifier
if (columnIndex < 0) {
throw new Error("You passed in a bunk string!");
}
var column = columns[columnIndex];
column.width = token;
}
}
var result = {
columnMap: columns,
sortID: sortID,
sortIsAscending: sortIsAscending
}
return result;
}
/**
* The playlist columns are no longer locked to 100% of the screen width,
* so we often need to resize all columns when appending new ones.
*
* \param aColumnsArray Array of column objects produced by parseColumnSpec
* \param aNeededWidth Amount of room to free up in the column array
*/
ColumnSpecParser.reduceWidthsProportionally = function(aColumnsArray,
aNeededWidth)
{
var fullWidth = 0;
for each (var col in aColumnsArray) {
if (!col.width || col.width < 80) continue;
fullWidth += parseInt(col.width);
}
for each (var col in aColumnsArray) {
if (!col.width || col.width < 80) continue;
var fraction = parseInt(col.width)/fullWidth;
var subtract = fraction * aNeededWidth;
// Round down, since it is better to be too small than to overflow
// and require a scroll bar
col.width = Math.floor(parseInt(col.width) - subtract);
}
}