Additional properties support

README.md

@@ -17,6 +17,20 @@ JSON.stringify obj x 1,763,980 ops/sec ±1.30% (88 runs sampled)
 fast-json-stringify obj x 5,085,148 ops/sec ±1.56% (89 runs sampled)
 ```
 
+#### Table of contents:
+- <a href="#example">`Example`</a>
+- <a href="#api">`API`</a>
+ - <a href="#fastJsonStringify">`fastJsonStringify`</a>
+ - <a href="#specific">`Specific use cases`</a>
+ - <a href="#required">`Required`</a>
+ - <a href="#missingFields">`Missing fields`</a>
+ - <a href="#patternProperties">`Pattern Properties`</a>
+ - <a href="#additionalProperties">`Additional Properties`</a>
+- <a href="#acknowledgements">`Acknowledgements`</a>
+- <a href="#license">`License`</a>
+
+
+<a name="example"></a>
 ## Example
 
 ```js
@@ -48,9 +62,9 @@ console.log(stringify({
   reg: /"([^"]|\\")*"/
 }))
 ```
-
+<a name="api"></a>
 ## API
-
+<a name="fastJsonStringify"></a>
 ### fastJsonStringify(schema)
 
 Build a `stringify()` function based on
@@ -68,13 +82,15 @@ Supported types:
 
 And nested ones, too.  
 
+<a name="specific"></a>
 #### Specific use cases
 
 | Instance   | Serialized as                |
 | -----------|------------------------------|
 | `Date`     | `string` via `toISOString()` |
 | `RegExp`   | `string`                     |
 
+<a name="required"></a>
 #### Required
 You can set specific fields of an object as required in your schema, by adding the field name inside the `required` array in your schema.  
 Example:
@@ -95,6 +111,7 @@ const schema = {
 ```
 If the object to stringify has not the required field(s), `fast-json-stringify` will throw an error.
 
+<a name="missingFields"></a>
 #### Missing fields
 If a field *is present* in the schema (and is not required) but it *is not present* in the object to stringify, `fast-json-stringify` will not write it in the final string.  
 Example:
@@ -109,8 +126,7 @@ const stringify = fastJson({
     mail: {
       type: 'string'
     }
-  },
-  required: ['mail']
+  }
 })
 
 const obj = {
@@ -120,6 +136,7 @@ const obj = {
 console.log(stringify(obj)) // '{"mail":"[email protected]"}'
 ```
 
+<a name="patternProperties"></a>
 #### Pattern properties
 `fast-json-stringify` supports pattern properties as defined inside JSON schema.  
 *patternProperties* must be an object, where the key is a valid regex and the value is an object, declared in this way: `{ type: 'type' }`.  
@@ -151,13 +168,58 @@ const obj = {
   matchnum: 3
 }
 
-console.log(stringify(obj)) // '{"nickname":"nick","matchfoo":"42","otherfoo":"str","matchnum":3}'
+console.log(stringify(obj)) // '{"matchfoo":"42","otherfoo":"str","matchnum":3,"nickname":"nick"}'
+```
+
+<a name="additionalProperties"></a>
+#### Additional properties
+`fast-json-stringify` supports additional properties as defined inside JSON schema.  
+*additionalProperties* must be an object or a boolean, declared in this way: `{ type: 'type' }`.  
+*additionalProperties* will work only for the properties that are not explicitly listed in the *properties* and *patternProperties* objects.
+
+If *additionalProperties* is not present or is setted to false, every property that is not explicitly listed in the *properties* and *patternProperties* objects, will be ignored, as said in <a href="#missingFields">Missing fields</a>.  
+If *additionalProperties* is setted to *true*, it will be used `fast-safe-stringify` to stringify the additional properties. If you want to achieve maximum performances we strongly encourage you to use a fixed schema where possible.  
+Example:
+```javascript
+const stringify = fastJson({
+  title: 'Example Schema',
+  type: 'object',
+  properties: {
+    nickname: {
+      type: 'string'
+    }
+  },
+  patternProperties: {
+    'num': {
+      type: 'number'
+    },
+    '.*foo$': {
+      type: 'string'
+    }
+  },
+  additionalProperties: {
+    type: 'string'
+  }
+})
+
+const obj = {
+  nickname: 'nick',
+  matchfoo: 42,
+  otherfoo: 'str'
+  matchnum: 3,
+  nomatchstr: 'valar morghulis',
+  nomatchint: 313
+}
+
+console.log(stringify(obj)) // '{"matchfoo":"42","otherfoo":"str","matchnum":3,"nomatchstr":"valar morghulis",nomatchint:"313","nickname":"nick"}'
 ```
 
+<a name="acknowledgements"></a>
 ## Acknowledgements
 
 This project was kindly sponsored by [nearForm](http://nearform.com).
 
+<a name="license"></a>
 ## License
 
 MIT

example.js

@@ -49,6 +49,9 @@ const stringify = fastJson({
     'test': {
       type: 'number'
     }
+  },
+  additionalProperties: {
+    type: 'string'
   }
 })
 
@@ -63,5 +66,8 @@ console.log(stringify({
   test: 42,
   strtest: '23',
   arr: [{ str: 'stark' }, { str: 'lannister' }],
-  obj: { bool: true }
+  obj: { bool: true },
+  notmatch: 'valar morghulis',
+  notmatchobj: { a: true },
+  notmatchnum: 42
 }))

index.js

@@ -1,5 +1,7 @@
 'use strict'
 
+const fastSafeStringify = require('fast-safe-stringify')
+
 function build (schema) {
   /* eslint no-new-func: "off" */
   var code = `
@@ -51,7 +53,9 @@ function build (schema) {
     ;
     return ${main}
   `
-
+  if (schema.additionalProperties === true) {
+    return (new Function('fastSafeStringify', code))(fastSafeStringify)
+  }
   return (new Function(code))()
 }
 
@@ -137,7 +141,7 @@ function $asRegExp (reg) {
   return '"' + reg + '"'
 }
 
-function addPatternProperties (pp) {
+function addPatternProperties (pp, ap) {
   let code = `
       var keys = Object.keys(obj)
       for (var i = 0; i < keys.length; i++) {
@@ -176,27 +180,87 @@ function addPatternProperties (pp) {
       `
     } else {
       code += `
-          throw new Error('Cannot coerce ' + obj[keys[i]] + ' to ${type}')
+        throw new Error('Cannot coerce ' + obj[keys[i]] + ' to ${type}')
       `
     }
+
     code += `
+          continue
         }
     `
   })
+  if (ap) {
+    code += additionalProperty(ap)
+  }
+
   code += `
       }
-      if (Object.keys(properties).length === 0) json = json.substring(0, json.length - 1)
   `
   return code
 }
 
+function additionalProperty (ap) {
+  let code = ''
+  if (ap === true) {
+    return `
+        json += $asString(keys[i]) + ':' + fastSafeStringify(obj[keys[i]]) + ','
+    `
+  }
+  let type = ap.type
+  if (type === 'object') {
+    code += buildObject(ap, '', 'buildObjectAP')
+    code += `
+        json += $asString(keys[i]) + ':' + buildObjectAP(obj[keys[i]]) + ','
+    `
+  } else if (type === 'array') {
+    code += buildArray(ap, '', 'buildArrayAP')
+    code += `
+        json += $asString(keys[i]) + ':' + buildArrayAP(obj[keys[i]]) + ','
+    `
+  } else if (type === 'null') {
+    code += `
+        json += $asString(keys[i]) +':null,'
+    `
+  } else if (type === 'string') {
+    code += `
+        json += $asString(keys[i]) + ':' + $asString(obj[keys[i]]) + ','
+    `
+  } else if (type === 'number' || type === 'integer') {
+    code += `
+        json += $asString(keys[i]) + ':' + $asNumber(obj[keys[i]]) + ','
+    `
+  } else if (type === 'boolean') {
+    code += `
+        json += $asString(keys[i]) + ':' + $asBoolean(obj[keys[i]]) + ','
+    `
+  } else {
+    code += `
+        throw new Error('Cannot coerce ' + obj[keys[i]] + ' to ${type}')
+    `
+  }
+  return code
+}
+
+function addAdditionalProperties (ap) {
+  return `
+      var keys = Object.keys(obj)
+      for (var i = 0; i < keys.length; i++) {
+        if (properties[keys[i]]) continue
+        ${additionalProperty(ap)}
+      }
+  `
+}
+
 function buildObject (schema, code, name) {
   code += `
     function ${name} (obj) {
       var json = '{'
   `
+
   if (schema.patternProperties) {
-    code += addPatternProperties(schema.patternProperties)
+    code += addPatternProperties(schema.patternProperties, schema.additionalProperties)
+  } else if (schema.additionalProperties && !schema.patternProperties) {
+    code += addAdditionalProperties(schema.additionalProperties)
   }
 
   var laterCode = ''
@@ -232,7 +296,9 @@ function buildObject (schema, code, name) {
     `
   })
 
+  // Removes the comma if is the last element of the string (in case there are not properties)
   code += `
+      if (json[json.length - 1] === ',') json = json.substring(0, json.length - 1)
       json += '}'
       return json
     }

package.json

@@ -29,5 +29,8 @@
     "pre-commit": "^1.1.3",
     "standard": "^8.2.0",
     "tap": "^7.1.2"
+  },
+  "dependencies": {
+    "fast-safe-stringify": "^1.1.0"
   }
 }