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semantic/prototype/UI/diff.js

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2015-10-27 18:11:45 +03:00
function diffFromJSON(json) {
if (json.pure != null) {
return new Diff({
pure: new Patch(json.pure)
});
}
if (json.roll != null) {
return new Diff({
roll: {
extract: json.roll.extract,
unwrap: new Syntax(json.roll.unwrap, function(x) {
return diffFromJSON(x);
})
}
});
}
}
function Diff(object) {
if (object.pure != null) {
this.pure = object.pure;
}
if (object.roll != null) {
this.roll = object.roll;
}
return this;
}
// forall a b. Diff a -> (a -> b) -> Diff b
Diff.prototype.map = function(transform) {
if (this.pure != null) {
return new Diff({
pure: transform(this.pure)
});
}
if (this.roll != null) {
return new Diff({
roll: {
extract: this.roll.extract,
unwrap: this.roll.unwrap.map(function(x) {
return x.map(transform);
})
}
});
}
}
// forall a. Diff a -> (Syntax a -> a) -> a
Diff.prototype.cata = function(transform) {
if (this.pure != null) {
return this.pure;
}
if (this.roll != null) {
return transform(this.roll.unwrap.map(function(diff) {
return diff.cata(transform);
}))
}
}
/// Diff -> String -> String -> DOM
function diffToDOM(diff, which, source) {
if (diff.pure != null) {
return diff.pure;
}
function getRange(diff) {
if (diff.pure != null) {
return diff.pure["data-range"];
}
if (diff.roll != null) {
return diff.roll.extract[which];
}
}
return rangeAndSyntaxToDOM(getRange(diff), diff.roll.unwrap, source, getRange, function(diff) {
return diffToDOM(diff, which, source);
})
}