1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
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 document
representation for setting and removing range or line-based attributes.
@param rep the document representation to be used
@param applyChangesetCallback this callback will be called
once a changeset has been built.
A document representation contains
- an array `alines` containing 1 attributes string for each line
- an Attribute pool `apool`
- a SkipList `lines` containing the text lines of the document.
*/
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.lineAttributes = lineAttributes;
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;
},
/*
Sets attributes on a range
@param start [row, col] tuple pointing to the start of the range
@param end [row, col] tuple pointing to the end of the range
@param attribute: an array of attributes
*/
setAttributesOnRange: function(start, end, attribs)
{
var builder = Changeset.builder(this.rep.lines.totalWidth());
ChangesetUtils.buildKeepToStartOfRange(this.rep, builder, start);
ChangesetUtils.buildKeepRange(this.rep, builder, start, end, attribs, this.rep.apool);
return this.applyChangeset(builder);
},
/*
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 '';
},
/*
Gets all attributes on a line
@param lineNum: the number of the line to set the attribute for
*/
getAttributesOnLine: function(lineNum){
// get attributes of first char of line
var aline = this.rep.alines[lineNum];
var attributes = []
if (aline)
{
var opIter = Changeset.opIterator(aline)
, op
if (opIter.hasNext())
{
op = opIter.next()
if(!op.attribs) return []
Changeset.eachAttribNumber(op.attribs, function(n) {
attributes.push([this.rep.apool.getAttribKey(n), this.rep.apool.getAttribValue(n)])
}.bind(this))
return attributes;
}
}
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);
var attribs
var foundAttrib = false
attribs = this.getAttributesOnLine(lineNum).map(function(attrib) {
if(attrib[0] === attributeName) {
foundAttrib = true
return [attributeName, null] // remove this attrib from the linemarker
}
return attrib
})
if(!foundAttrib) {
return
}
if(hasMarker){
ChangesetUtils.buildKeepRange(this.rep, builder, loc, (loc = [lineNum, 0]));
// If length == 4, there's [author, lmkr, insertorder, + the attrib being removed] thus we can remove the marker entirely
if(attribs.length <= 4) ChangesetUtils.buildRemoveRange(this.rep, builder, loc, (loc = [lineNum, 1]))
else ChangesetUtils.buildKeepRange(this.rep, builder, loc, (loc = [lineNum, 1]), attribs, this.rep.apool);
}
return this.applyChangeset(builder);
},
/*
Toggles a line attribute for the specified line number
If a line attribute with the specified name exists with any value it will be removed
Otherwise it will be set to the given value
@param lineNum: the number of the line to toggle the attribute for
@param attributeKey: the name of the attribute to toggle, e.g. list
@param attributeValue: the value to pass to the attribute (e.g. indention level)
*/
toggleAttributeOnLine: function(lineNum, attributeName, attributeValue) {
return this.getAttributeOnLine(lineNum, attributeName) ?
this.removeAttributeOnLine(lineNum, attributeName) :
this.setAttributeOnLine(lineNum, attributeName, attributeValue);
}
});
module.exports = AttributeManager;
|
