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implement cursor transformation in a common library

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This commit is contained in:
ansuz 2016-04-17 14:02:45 +02:00
parent 92d89f6cac
commit d3c2c901b6
1 changed files with 15 additions and 0 deletions
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15
www/common/TextPatcher.js
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@ -85,6 +85,20 @@ var applyChange = function(ctx, oldval, newval, logging) {
patch(ctx, op);
};
var transformCursor = function (cursor, op) {
var pos = op.offset;
var remove = op.toRemove;
var insert = op.toInsert.length;
if (typeof cursor === 'undefined') { return; }
if (typeof remove === 'number' && pos < cursor) {
cursor -= Math.min(remove, cursor - pos);
}
if (typeof insert === 'number' && pos < cursor) {
cursor += insert;
}
return cursor;
};
var create = function(config) {
var ctx = config.realtime;
var logging = config.logging;
@ -116,6 +130,7 @@ return {
diff: diff, // diff two strings
patch: patch, // apply an operation to a chainpad's realtime facade
log: log, // print the components of an operation
transformCursor: transformCursor, // transform the position of a cursor
applyChange: applyChange // a convenient wrapper around diff/log/patch
};
});