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index.js
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index.js
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'use strict';
var t = require('tcomb');
var fcomb = require('fcomb');
var util = require('./util');
var Str = t.Str;
var Num = t.Num;
var Bool = t.Bool;
var Obj = t.Obj;
var Arr = t.Arr;
var subtype = t.subtype;
var enums = t.enums;
var SchemaType = enums.of('null string number integer boolean object array', 'SchemaType');
function and(f, g) {
return f ? fcomb.and(f, g) : g;
}
var types = {
string: function (s) {
if (s.hasOwnProperty('enum')) {
return enums.of(s['enum']);
}
var predicate;
if (s.hasOwnProperty('minLength')) {
predicate = and(predicate, fcomb.minLength(s.minLength));
}
if (s.hasOwnProperty('maxLength')) {
predicate = and(predicate, fcomb.maxLength(s.maxLength));
}
if (s.hasOwnProperty('pattern')) {
predicate = and(predicate, fcomb.regexp(new RegExp(s.pattern)));
}
if (s.hasOwnProperty('format')) {
t.assert(formats.hasOwnProperty(s.format), 'missing format %s, use the `registerFormat` API', s.format);
predicate = and(predicate, formats[s.format]);
}
return predicate ? subtype(Str, predicate) : Str;
},
number: function (s) {
var predicate;
if (s.hasOwnProperty('minimum')) {
predicate = s.exclusiveMinimum ?
and(predicate, fcomb.gt(s.minimum)) :
and(predicate, fcomb.gte(s.minimum));
}
if (s.hasOwnProperty('maximum')) {
predicate = s.exclusiveMaximum ?
and(predicate, fcomb.lt(s.maximum)) :
and(predicate, fcomb.lte(s.maximum));
}
if (s.hasOwnProperty('integer') && s.integer) {
predicate = and(predicate, util.isInteger);
}
return predicate ? subtype(Num, predicate) : Num;
},
integer: function (s) {
var predicate;
if (s.hasOwnProperty('minimum')) {
predicate = s.exclusiveMinimum ?
and(predicate, fcomb.gt(s.minimum)) :
and(predicate, fcomb.gte(s.minimum));
}
if (s.hasOwnProperty('maximum')) {
predicate = s.exclusiveMaximum ?
and(predicate, fcomb.lt(s.maximum)) :
and(predicate, fcomb.lte(s.maximum));
}
return predicate ? subtype(util.Int, predicate) : util.Int;
},
boolean: function (s) {
return Bool;
},
object: function (s) {
var props = {};
var hasProperties = false;
var required = {};
if (s.required) {
s.required.forEach(function (k) {
required[k] = true;
});
}
for (var k in s.properties) {
if (s.properties.hasOwnProperty(k)) {
hasProperties = true;
var type = transform(s.properties[k]);
props[k] = required[k] || type === Bool ? type : t.maybe(type);
}
}
return hasProperties ? t.struct(props, s.description) : Obj;
},
array: function (s) {
if (s.hasOwnProperty('items')) {
var items = s.items;
if (Obj.is(items)) {
return t.list(transform(s.items));
}
return t.tuple(items.map(transform));
}
var predicate;
if (s.hasOwnProperty('minItems')) {
predicate = and(predicate, fcomb.minLength(s.minItems));
}
if (s.hasOwnProperty('maxItems')) {
predicate = and(predicate, fcomb.maxLength(s.maxItems));
}
return predicate ? subtype(Arr, predicate) : Arr;
},
null: function () {
return util.Null;
}
};
function transform(s) {
t.assert(Obj.is(s));
if (!s.hasOwnProperty('type')) {
return t.Any;
}
var type = s.type;
if (SchemaType.is(type)) {
return types[type](s);
}
if (Arr.is(type)) {
return t.union(type.map(function (type) {
return types[type](s);
}));
}
t.fail(t.format('unsupported json schema %j', s));
}
var formats = {};
transform.registerFormat = function registerFormat(format, predicate) {
t.assert(!formats.hasOwnProperty(format), '[tcomb-json-schema] duplicated format %s', format);
formats[format] = predicate;
};
transform.resetFormats = function resetFormats() {
formats = {};
};
module.exports = transform;