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