refactor: convert custom.def partial into custom.jst function (for better encapsulation)

lib/dot/custom.jst

@@ -1,10 +1,11 @@
+{{# def.definitions }}
+{{# def.errors }}
+{{# def.setupKeyword }}
+
 {{
-  var $schema = it.schema[$rule.keyword]
+  var $rule = this
     , $ruleValidate = it.useCustomRule($rule, $schema, it.schema, it)
     , $ruleErrs = $ruleValidate.code + '.errors'
-    , $schemaPath = it.schemaPath + '.' + $rule.keyword
-    , $errSchemaPath = it.errSchemaPath + '/' + $rule.keyword
-    , $errs = 'errs' + $lvl
     , $i = 'i' + $lvl
     , $ruleErr = 'ruleErr' + $lvl
     , $rDef = $rule.definition
@@ -16,6 +17,7 @@
     throw new Error('async keyword in sync schema');
 }}
 
+
 {{? !($inline || $macro) }}{{=$ruleErrs}} = null;{{?}}
 var {{=$errs}} = errors;
 var valid{{=$lvl}};
@@ -146,6 +148,5 @@ if (!{{# def.ruleValidationResult }}) {
       }
     {{?}}
   {{?}}
-  {{ $errorKeyword = undefined; }}
 
  } {{? $breakOnError }} else { {{?}}

lib/dot/validate.jst

@@ -106,11 +106,7 @@
       {{?}}
       {{~ $rulesGroup.rules:$rule }}
         {{? $shouldUseRule($rule) }}
-          {{? $rule.custom }}
-            {{# def.custom }}
-          {{??}}
-            {{= $rule.code(it, $rule.keyword) }}
-          {{?}}
+          {{= $rule.code(it, $rule.keyword) }}
           {{? $breakOnError }}
             {{ $closingBraces1 += '}'; }}
           {{?}}

lib/keyword.js

@@ -1,6 +1,7 @@
 'use strict';
 
 var IDENTIFIER = /^[a-z_$][a-z0-9_$]*$/i;
+var customRuleCode = require('./dotjs/custom');
 
 /**
  * Define custom keyword
@@ -51,7 +52,12 @@ module.exports = function addKeyword(keyword, definition) {
       self.RULES.push(ruleGroup);
     }
 
-    var rule = { keyword: keyword, definition: definition, custom: true };
+    var rule = {
+      keyword: keyword,
+      definition: definition,
+      custom: true,
+      code: customRuleCode
+    };
     ruleGroup.rules.push(rule);
   }