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var Changeset = require('./Changeset');
var ChangesetUtils = require('./ChangesetUtils');
var _ = require('./underscore');
var lineMarkerAttribute = 'lmkr';
// If one of these attributes are set to the first character of a
// line it is considered as a line attribute marker i.e. attributes
// set on this marker are applied to the whole line.
// The list attribute is only maintained for compatibility reasons
var lineAttributes = [lineMarkerAttribute,'list'];
/*
The Attribute manager builds changesets based on a SkipList
for setting and removing range or line-based Attributes.
@param rep the SkipList to be used
@param applyChangesetCallback this callback will be called
once a changeset has been built.
*/
var AttributeManager = function(rep, applyChangesetCallback)
{
this.rep = rep;
this.applyChangesetCallback = applyChangesetCallback;
this.author = '';
// If the first char in a line has one of the following attributes
// it will be considered as a line marker
};
AttributeManager.prototype = _(AttributeManager.prototype).extend({
applyChangeset: function(changeset){
if(!this.applyChangesetCallback) return changeset;
var cs = changeset.toString();
if (!Changeset.isIdentity(cs))
{
this.applyChangesetCallback(cs);
}
return changeset;
},
/*
Returns if the line already has a line marker
@param lineNum: the number of the line
*/
lineHasMarker: function(lineNum){
var that = this;
return _.find(lineAttributes, function(attribute){
return that.getAttributeOnLine(lineNum, attribute) != '';
}) !== undefined;
},
/*
Gets a specified attribute on a line
@param lineNum: the number of the line to set the attribute for
@param attributeKey: the name of the attribute to get, e.g. list
*/
getAttributeOnLine: function(lineNum, attributeName){
// get `attributeName` attribute of first char of line
var aline = this.rep.alines[lineNum];
if (aline)
{
var opIter = Changeset.opIterator(aline);
if (opIter.hasNext())
{
return Changeset.opAttributeValue(opIter.next(), attributeName, this.rep.apool) || '';
}
}
return '';
},
/*
Sets a specified attribute on a line
@param lineNum: the number of the line to set the attribute for
@param attributeKey: the name of the attribute to set, e.g. list
@param attributeValue: an optional parameter to pass to the attribute (e.g. indention level)
*/
setAttributeOnLine: function(lineNum, attributeName, attributeValue){
var loc = [0,0];
var builder = Changeset.builder(this.rep.lines.totalWidth());
var hasMarker = this.lineHasMarker(lineNum);
ChangesetUtils.buildKeepRange(this.rep, builder, loc, (loc = [lineNum, 0]));
if(hasMarker){
ChangesetUtils.buildKeepRange(this.rep, builder, loc, (loc = [lineNum, 1]), [
[attributeName, attributeValue]
], this.rep.apool);
}else{
// add a line marker
builder.insert('*', [
['author', this.author],
['insertorder', 'first'],
[lineMarkerAttribute, '1'],
[attributeName, attributeValue]
], this.rep.apool);
}
return this.applyChangeset(builder);
},
/*
Removes a specified attribute on a line
@param lineNum: the number of the affected line
@param attributeKey: the name of the attribute to remove, e.g. list
*/
removeAttributeOnLine: function(lineNum, attributeName, attributeValue){
var loc = [0,0];
var builder = Changeset.builder(this.rep.lines.totalWidth());
var hasMarker = this.lineHasMarker(lineNum);
if(hasMarker){
ChangesetUtils.buildKeepRange(this.rep, builder, loc, (loc = [lineNum, 0]), [
[attributeName, attributeValue]
], this.rep.apool);
ChangesetUtils.buildRemoveRange(this.rep, builder, loc, (loc = [lineNum, 1]));
}
return this.applyChangeset(builder);
},
/*
Sets a specified attribute on a line
@param lineNum: the number of the line to set the attribute for
@param attributeKey: the name of the attribute to set, e.g. list
@param attributeValue: an optional parameter to pass to the attribute (e.g. indention level)
*/
toggleAttributeOnLine: function(lineNum, attributeName, attributeValue) {
return this.getAttributeOnLine(attributeName) ?
this.removeAttributeOnLine(lineNum, attributeName) :
this.setAttributeOnLine(lineNum, attributeName, attributeValue);
}
});
module.exports = AttributeManager;
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