From c002bda601ba02a9c77b7509ca6bab370ac1783b Mon Sep 17 00:00:00 2001
From: Tom Noogen <tom@noogen.net>
Date: Mon, 8 Jul 2019 10:28:41 -0500
Subject: [PATCH] reformatting and update documentation

---
 .gitignore    |   35 +-
 README.md     |   32 +
 composer.lock | 1542 +++++++++++++++++++++++++++++++++++++++++++++++++
 src/Bayes.php |  294 ++++++----
 4 files changed, 1772 insertions(+), 131 deletions(-)
 create mode 100644 composer.lock

diff --git a/.gitignore b/.gitignore
index 30ef0ca..b9baa20 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,7 +1,32 @@
+/node_modules
+/public/hot
+/public/storage
+/storage/*.key
+/storage/debugbar
+/vendor
+/.idea
+/.vagrant
+Homestead.json
+Homestead.yaml
+npm-debug.log
+yarn-error.log
+
 .DS_Store
-.idea/
-vendor/
-build/
-composer.lock
+coverage/
+bootstrap/cache/*.php
+storage/build/
+public/js/parts/*
+.env
+
+.docker/data/
+!.docker/data/*/*.gitkeep
+!.docker/data/*.gitkeep
+.docker/logs/
+!.docker/logs/*.gitkeep
+storage/installed
+docker-compose.yml
+._*.png
+dist.zip
+.php*.cache
 
-/.phpintel/
+playbook/recipe/downloaded/
diff --git a/README.md b/README.md
index 725d60a..ccd22d1 100644
--- a/README.md
+++ b/README.md
@@ -65,6 +65,10 @@ Teach your classifier what `category` the `text` belongs to. The more you teach
 
 Returns the `category` it thinks `text` belongs to. Its judgement is based on what you have taught it with **.learn()**.
 
+### `$classifier->propabilities(text)`
+
+Extract the probabilities for each known category.
+
 ### `$classifier->toJson()`
 
 Returns the JSON representation of a classifier.
@@ -73,5 +77,33 @@ Returns the JSON representation of a classifier.
 
 Returns a classifier instance from the JSON representation. Use this with the JSON representation obtained from `$classifier->toJson()`
 
+## Stopwords
+
+You can pass in your own tokenizer function in the constructor.  Example:
+
+```
+// array containing stopwords
+$stopwords = array("der", "die", "das", "the");
+
+// escape the stopword array and implode with pipe
+$s = '~^\W*('.implode("|", array_map("preg_quote", $stopwords)).')\W+\b|\b\W+(?1)\W*$~i';
+
+$options['tokenizer'] = function($text) use ($s) {
+            // convert everything to lowercase
+            $text = mb_strtolower($text);
+
+            // remove stop words
+            $text = preg_replace($s, '', $text);
+
+            // split the words
+            preg_match_all('/[[:alpha:]]+/u', $text, $matches);
+
+            // first match list of words
+            return $matches[0];
+        };
+
+$classifier = new \niiknow\Bayes($options);
+```
+
 ## MIT
 
diff --git a/composer.lock b/composer.lock
new file mode 100644
index 0000000..ce84441
--- /dev/null
+++ b/composer.lock
@@ -0,0 +1,1542 @@
+{
+    "_readme": [
+        "This file locks the dependencies of your project to a known state",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
+        "This file is @generated automatically"
+    ],
+    "content-hash": "b649912c285ba33ba94e6fcdc8e740eb",
+    "packages": [],
+    "packages-dev": [
+        {
+            "name": "doctrine/instantiator",
+            "version": "1.2.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/doctrine/instantiator.git",
+                "reference": "a2c590166b2133a4633738648b6b064edae0814a"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/doctrine/instantiator/zipball/a2c590166b2133a4633738648b6b064edae0814a",
+                "reference": "a2c590166b2133a4633738648b6b064edae0814a",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.1"
+            },
+            "require-dev": {
+                "doctrine/coding-standard": "^6.0",
+                "ext-pdo": "*",
+                "ext-phar": "*",
+                "phpbench/phpbench": "^0.13",
+                "phpstan/phpstan-phpunit": "^0.11",
+                "phpstan/phpstan-shim": "^0.11",
+                "phpunit/phpunit": "^7.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.2.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Doctrine\\Instantiator\\": "src/Doctrine/Instantiator/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Marco Pivetta",
+                    "email": "ocramius@gmail.com",
+                    "homepage": "http://ocramius.github.com/"
+                }
+            ],
+            "description": "A small, lightweight utility to instantiate objects in PHP without invoking their constructors",
+            "homepage": "https://www.doctrine-project.org/projects/instantiator.html",
+            "keywords": [
+                "constructor",
+                "instantiate"
+            ],
+            "time": "2019-03-17T17:37:11+00:00"
+        },
+        {
+            "name": "myclabs/deep-copy",
+            "version": "1.9.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/myclabs/DeepCopy.git",
+                "reference": "e6828efaba2c9b79f4499dae1d66ef8bfa7b2b72"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/e6828efaba2c9b79f4499dae1d66ef8bfa7b2b72",
+                "reference": "e6828efaba2c9b79f4499dae1d66ef8bfa7b2b72",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.1"
+            },
+            "replace": {
+                "myclabs/deep-copy": "self.version"
+            },
+            "require-dev": {
+                "doctrine/collections": "^1.0",
+                "doctrine/common": "^2.6",
+                "phpunit/phpunit": "^7.1"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "DeepCopy\\": "src/DeepCopy/"
+                },
+                "files": [
+                    "src/DeepCopy/deep_copy.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "Create deep copies (clones) of your objects",
+            "keywords": [
+                "clone",
+                "copy",
+                "duplicate",
+                "object",
+                "object graph"
+            ],
+            "time": "2019-04-07T13:18:21+00:00"
+        },
+        {
+            "name": "phar-io/manifest",
+            "version": "1.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phar-io/manifest.git",
+                "reference": "2df402786ab5368a0169091f61a7c1e0eb6852d0"
+            },
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+                "type": "zip",
+                "url": "https://api.github.com/repos/phar-io/manifest/zipball/2df402786ab5368a0169091f61a7c1e0eb6852d0",
+                "reference": "2df402786ab5368a0169091f61a7c1e0eb6852d0",
+                "shasum": ""
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+            "require": {
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+                "ext-phar": "*",
+                "phar-io/version": "^1.0.1",
+                "php": "^5.6 || ^7.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.0.x-dev"
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+            "autoload": {
+                "classmap": [
+                    "src/"
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+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
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+            ],
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+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                },
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+                    "email": "sebastian@phpeople.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "Component for reading phar.io manifest information from a PHP Archive (PHAR)",
+            "time": "2017-03-05T18:14:27+00:00"
+        },
+        {
+            "name": "phar-io/version",
+            "version": "1.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phar-io/version.git",
+                "reference": "a70c0ced4be299a63d32fa96d9281d03e94041df"
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+            },
+            "require": {
+                "php": "^5.6 || ^7.0"
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+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
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+                    "email": "sebastian@phpeople.de",
+                    "role": "Developer"
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+                    "email": "sebastian@phpunit.de",
+                    "role": "Developer"
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+            ],
+            "description": "Library for handling version information and constraints",
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+            "version": "1.0.1",
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+                "shasum": ""
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+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.0.x-dev"
+                }
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+                    ]
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
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+                    "email": "opensource@ijaap.nl"
+                }
+            ],
+            "description": "Common reflection classes used by phpdocumentor to reflect the code structure",
+            "homepage": "http://www.phpdoc.org",
+            "keywords": [
+                "FQSEN",
+                "phpDocumentor",
+                "phpdoc",
+                "reflection",
+                "static analysis"
+            ],
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+            "source": {
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+                "url": "https://github.com/phpDocumentor/ReflectionDocBlock.git",
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+            "description": "With this component, a library can provide support for annotations via DocBlocks or otherwise retrieve information that is embedded in a DocBlock.",
+            "time": "2019-04-30T17:48:53+00:00"
+        },
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+                    "phpDocumentor\\Reflection\\": [
+                        "src/"
+                    ]
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
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+                    "name": "Mike van Riel",
+                    "email": "me@mikevanriel.com"
+                }
+            ],
+            "time": "2017-07-14T14:27:02+00:00"
+        },
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+            "name": "phpspec/prophecy",
+            "version": "1.8.1",
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+            },
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+            "extra": {
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+                    "dev-master": "1.8.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Prophecy\\": "src/Prophecy"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Konstantin Kudryashov",
+                    "email": "ever.zet@gmail.com",
+                    "homepage": "http://everzet.com"
+                },
+                {
+                    "name": "Marcello Duarte",
+                    "email": "marcello.duarte@gmail.com"
+                }
+            ],
+            "description": "Highly opinionated mocking framework for PHP 5.3+",
+            "homepage": "https://github.com/phpspec/prophecy",
+            "keywords": [
+                "Double",
+                "Dummy",
+                "fake",
+                "mock",
+                "spy",
+                "stub"
+            ],
+            "time": "2019-06-13T12:50:23+00:00"
+        },
+        {
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+            "version": "5.3.2",
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+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/php-code-coverage.git",
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+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
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+                "testing",
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+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
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+            "authors": [
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+                    "email": "sb@sebastian-bergmann.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "FilterIterator implementation that filters files based on a list of suffixes.",
+            "homepage": "https://github.com/sebastianbergmann/php-file-iterator/",
+            "keywords": [
+                "filesystem",
+                "iterator"
+            ],
+            "time": "2017-11-27T13:52:08+00:00"
+        },
+        {
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+            "version": "1.2.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/php-text-template.git",
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+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
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+            ],
+            "authors": [
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+            "description": "Allows reflection of object attributes, including inherited and non-public ones",
+            "homepage": "https://github.com/sebastianbergmann/object-reflector/",
+            "time": "2017-03-29T09:07:27+00:00"
+        },
+        {
+            "name": "sebastian/recursion-context",
+            "version": "3.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/recursion-context.git",
+                "reference": "5b0cd723502bac3b006cbf3dbf7a1e3fcefe4fa8"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/recursion-context/zipball/5b0cd723502bac3b006cbf3dbf7a1e3fcefe4fa8",
+                "reference": "5b0cd723502bac3b006cbf3dbf7a1e3fcefe4fa8",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^6.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.0.x-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Jeff Welch",
+                    "email": "whatthejeff@gmail.com"
+                },
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                },
+                {
+                    "name": "Adam Harvey",
+                    "email": "aharvey@php.net"
+                }
+            ],
+            "description": "Provides functionality to recursively process PHP variables",
+            "homepage": "http://www.github.com/sebastianbergmann/recursion-context",
+            "time": "2017-03-03T06:23:57+00:00"
+        },
+        {
+            "name": "sebastian/resource-operations",
+            "version": "1.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/resource-operations.git",
+                "reference": "ce990bb21759f94aeafd30209e8cfcdfa8bc3f52"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/resource-operations/zipball/ce990bb21759f94aeafd30209e8cfcdfa8bc3f52",
+                "reference": "ce990bb21759f94aeafd30209e8cfcdfa8bc3f52",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.6.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.0.x-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Provides a list of PHP built-in functions that operate on resources",
+            "homepage": "https://www.github.com/sebastianbergmann/resource-operations",
+            "time": "2015-07-28T20:34:47+00:00"
+        },
+        {
+            "name": "sebastian/version",
+            "version": "2.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/version.git",
+                "reference": "99732be0ddb3361e16ad77b68ba41efc8e979019"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/version/zipball/99732be0ddb3361e16ad77b68ba41efc8e979019",
+                "reference": "99732be0ddb3361e16ad77b68ba41efc8e979019",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.6"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.0.x-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Library that helps with managing the version number of Git-hosted PHP projects",
+            "homepage": "https://github.com/sebastianbergmann/version",
+            "time": "2016-10-03T07:35:21+00:00"
+        },
+        {
+            "name": "symfony/polyfill-ctype",
+            "version": "v1.11.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/polyfill-ctype.git",
+                "reference": "82ebae02209c21113908c229e9883c419720738a"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/polyfill-ctype/zipball/82ebae02209c21113908c229e9883c419720738a",
+                "reference": "82ebae02209c21113908c229e9883c419720738a",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.3"
+            },
+            "suggest": {
+                "ext-ctype": "For best performance"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.11-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Symfony\\Polyfill\\Ctype\\": ""
+                },
+                "files": [
+                    "bootstrap.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                },
+                {
+                    "name": "Gert de Pagter",
+                    "email": "BackEndTea@gmail.com"
+                }
+            ],
+            "description": "Symfony polyfill for ctype functions",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "compatibility",
+                "ctype",
+                "polyfill",
+                "portable"
+            ],
+            "time": "2019-02-06T07:57:58+00:00"
+        },
+        {
+            "name": "theseer/tokenizer",
+            "version": "1.1.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/theseer/tokenizer.git",
+                "reference": "11336f6f84e16a720dae9d8e6ed5019efa85a0f9"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/theseer/tokenizer/zipball/11336f6f84e16a720dae9d8e6ed5019efa85a0f9",
+                "reference": "11336f6f84e16a720dae9d8e6ed5019efa85a0f9",
+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "ext-tokenizer": "*",
+                "ext-xmlwriter": "*",
+                "php": "^7.0"
+            },
+            "type": "library",
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Arne Blankerts",
+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "A small library for converting tokenized PHP source code into XML and potentially other formats",
+            "time": "2019-06-13T22:48:21+00:00"
+        },
+        {
+            "name": "webmozart/assert",
+            "version": "1.4.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/webmozart/assert.git",
+                "reference": "83e253c8e0be5b0257b881e1827274667c5c17a9"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/webmozart/assert/zipball/83e253c8e0be5b0257b881e1827274667c5c17a9",
+                "reference": "83e253c8e0be5b0257b881e1827274667c5c17a9",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^5.3.3 || ^7.0",
+                "symfony/polyfill-ctype": "^1.8"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^4.6",
+                "sebastian/version": "^1.0.1"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.3-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Webmozart\\Assert\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Bernhard Schussek",
+                    "email": "bschussek@gmail.com"
+                }
+            ],
+            "description": "Assertions to validate method input/output with nice error messages.",
+            "keywords": [
+                "assert",
+                "check",
+                "validate"
+            ],
+            "time": "2018-12-25T11:19:39+00:00"
+        }
+    ],
+    "aliases": [],
+    "minimum-stability": "dev",
+    "stability-flags": [],
+    "prefer-stable": true,
+    "prefer-lowest": false,
+    "platform": {
+        "php": ">=7.1"
+    },
+    "platform-dev": []
+}
diff --git a/src/Bayes.php b/src/Bayes.php
index cfcf907..20e2580 100755
--- a/src/Bayes.php
+++ b/src/Bayes.php
@@ -6,39 +6,76 @@
  */
 class Bayes
 {
+    /**
+     * @var array
+     */
+    public $STATE_KEYS = [
+        'categories', 'docCount',
+        'totalDocuments',
+        'vocabulary', 'vocabularySize',
+        'wordCount', 'wordFrequencyCount'
+    ];
+
+    /**
+     * @var array
+     */
     public $categories;
+
+    /**
+     * @var number
+     */
     public $docCount;
+
+    /**
+     * @var number
+     */
     public $totalDocuments;
+
+    /**
+     * @var array
+     */
     public $vocabulary;
+
+    /**
+     * @var number
+     */
     public $vocabularySize;
+
+    /**
+     * @var number
+     */
     public $wordCount;
+
+    /**
+     * @var number
+     */
     public $wordFrequencyCount;
 
-    public $STATE_KEYS = [
-        'categories', 'docCount',
-        'totalDocuments',
-        'vocabulary', 'vocabularySize',
-        'wordCount', 'wordFrequencyCount'
-    ];
+    /**
+     * @var array
+     */
+    protected $options;
 
+    /**
+     * @var function
+     */
     protected $tokenizer;
-    protected $options;
 
     /**
      * Initialize an instance of a Naive-Bayes Classifier
+     *
      * @param array $options
      */
     public function __construct($options = null)
     {
-         // set options object
-        $that          = $this;
+        // set options object
         $this->options = $options;
         if (!$this->options) {
             $this->options = [];
         }
 
         // set default tokenizer
-        $this->tokenizer = function ($text) use ($that) {
+        $this->tokenizer = function ($text) {
             // convert everything to lowercase
             $text = mb_strtolower($text);
 
@@ -46,6 +83,7 @@ public function __construct($options = null)
             preg_match_all('/[[:alpha:]]+/u', $text, $matches);
 
             // first match list of words
+
             return $matches[0];
         };
 
@@ -57,45 +95,66 @@ public function __construct($options = null)
     }
 
     /**
-     * Reset the bayes class
+     * Identify the category of the provided text parameter.
      *
-     * @return Bayes
+     * @param  string $text
+     * @return string the category or null
      */
-    public function reset()
+    public function categorize($text)
     {
-        // hashmap of our category names
-        $this->categories = [];
+        $that           = $this;
+        $maxProbability = -INF;
+        $chosenCategory = null;
 
-        // document frequency table for each of our categories
-        // => for each category, how often were documents mapped to it
-        $this->docCount = [];
+        if ($that->totalDocuments > 0) {
+            $probabilities = $that->probabilities($text);
 
-        // number of documents we have learned from
-        $this->totalDocuments = 0;
-
-        // initialize our vocabulary and its size
-        $this->vocabulary     = [];
-        $this->vocabularySize = 0;
+            // iterate thru our categories to find the one with max probability
+            // for this text
+            foreach ($probabilities as $category => $logProbability) {
+                if ($logProbability > $maxProbability) {
+                    $maxProbability = $logProbability;
+                    $chosenCategory = $category;
+                }
+            }
+        }
 
-        // for each category, how many words total were mapped to it
-        $this->wordCount = [];
+        return $chosenCategory;
+    }
 
-        // word frequency table for each category
-        // => for each category, how frequent was a given word mapped to it
-        $this->wordFrequencyCount = [];
+    /**
+     * Build a frequency hashmap where
+     *  - the keys are the entries in `tokens`
+     *  - the values are the frequency of each entry in `tokens`
+     *
+     * @param  array $tokens array of string
+     * @return array hashmap of token frequency
+     */
+    public function frequencyTable($tokens)
+    {
+        $frequencyTable = [];
+        // => for each category, how often were documents mapped to it
+        foreach ($tokens as $token) {
+            if (!isset($frequencyTable[$token])) {
+                $frequencyTable[$token] = 1;
+            } else {
+                $frequencyTable[$token]++;
+            }
+        }
 
-        return $this;
+        return $frequencyTable;
     }
 
     /**
      * Deserialize from json
      *
-     * @param  object $json string or array
+     * @param  object  $json string or array
      * @return Bayes
      */
     public function fromJson($json)
     {
         $result = $json;
+
         // deserialize from json
         if (is_string($json)) {
             $result = json_decode($json, true);
@@ -113,27 +172,10 @@ public function fromJson($json)
         return $this;
     }
 
-    /**
-     * Serialize to json
-     *
-     * @return string the json string
-     */
-    public function toJson()
-    {
-        $result = [];
-
-        // serialize to json
-        foreach ($this->STATE_KEYS as $k) {
-            $result[$k] = $this->{$k};
-        }
-
-        return json_encode($result);
-    }
-
     /**
      * Make sure the category exists in dictionary
      *
-     * @param  string $categoryName
+     * @param  string  $categoryName
      * @return Bayes
      */
     public function initializeCategory($categoryName)
@@ -151,109 +193,131 @@ public function initializeCategory($categoryName)
     /**
      * Teach your classifier
      *
-     * @param  string $text
-     * @param  string $category
+     * @param  string  $text
+     * @param  string  $category
      * @return Bayes
      */
     public function learn($text, $category)
     {
-        $self = $this;
+        $that = $this;
 
         // initialize category data structures if we've never seen this category
-        $self->initializeCategory($category);
+        $that->initializeCategory($category);
 
         // update our count of how many documents mapped to this category
-        $self->docCount[$category]++;
+        $that->docCount[$category]++;
 
         // update the total number of documents we have learned from
-        $self->totalDocuments++;
+        $that->totalDocuments++;
 
         // normalize the text into a word array
-        $tokens = ($self->tokenizer)($text);
+        $tokens = ($that->tokenizer)($text);
 
         // get a frequency count for each token in the text
-        $frequencyTable = $self->frequencyTable($tokens);
+        $frequencyTable = $that->frequencyTable($tokens);
 
         // Update vocabulary and word frequency count for this category
         foreach ($frequencyTable as $token => $frequencyInText) {
             // add this word to our vocabulary if not already existing
-            if (!isset($self->vocabulary[$token])) {
-                $self->vocabulary[$token] = true;
-                $self->vocabularySize++;
+            if (!isset($that->vocabulary[$token])) {
+                $that->vocabulary[$token] = true;
+                $that->vocabularySize++;
             }
 
             // update the frequency information for this word in this category
-            if (!isset($self->wordFrequencyCount[$category][$token])) {
-                $self->wordFrequencyCount[$category][$token] = $frequencyInText;
+            if (!isset($that->wordFrequencyCount[$category][$token])) {
+                $that->wordFrequencyCount[$category][$token] = $frequencyInText;
             } else {
-                $self->wordFrequencyCount[$category][$token] += $frequencyInText;
+                $that->wordFrequencyCount[$category][$token] += $frequencyInText;
             }
 
             // update the count of all words we have seen mapped to this category
-            $self->wordCount[$category] += $frequencyInText;
+            $that->wordCount[$category] += $frequencyInText;
         }
 
-        return $self;
+        return $that;
     }
 
     /**
-     * Identify the category of the provided text parameter.
+     * Extract the probabilities for each known category
+     *
      * @param  string $text
-     * @return string       the category or null
+     * @return array  probabilities by category or null
      */
-    public function categorize($text)
+    public function probabilities($text)
     {
-        $self           = $this;
-        $maxProbability = -INF;
-        $chosenCategory = null;
+        $that          = $this;
+        $probabilities = [];
 
-        if ($self->totalDocuments > 0) {
-            $probabilities = $self->probabilities($text);
+        if ($that->totalDocuments > 0) {
+            $tokens         = ($that->tokenizer)($text);
+            $frequencyTable = $that->frequencyTable($tokens);
 
-            // iterate thru our categories to find the one with max probability
             // for this text
-            foreach ($probabilities as $category => $logProbability) {
-                if ($logProbability > $maxProbability) {
-                    $maxProbability = $logProbability;
-                    $chosenCategory = $category;
+            // iterate thru our categories to find the one with max probability
+            foreach ($that->categories as $category => $value) {
+                $categoryProbability = $that->docCount[$category] / $that->totalDocuments;
+                $logProbability      = log($categoryProbability);
+                foreach ($frequencyTable as $token => $frequencyInText) {
+                    $tokenProbability = $that->tokenProbability($token, $category);
+
+                    // determine the log of the P( w | c ) for this word
+                    $logProbability += $frequencyInText * log($tokenProbability);
                 }
+
+                $probabilities[$category] = $logProbability;
             }
         }
 
-        return $chosenCategory;
+        return $probabilities;
     }
 
     /**
-     * Extract the probabilities for each known category
-     * @param  string $text
-     * @return array       probabilities by category or null
+     * Reset the bayes class
+     *
+     * @return Bayes
      */
-    public function probabilities($text)
+    public function reset()
     {
-        $self           = $this;
-        $probabilities  = [];
+        // add this word to our vocabulary if not already existing
+        $this->categories = [];
 
-        if ($self->totalDocuments > 0) {
-            $tokens         = ($self->tokenizer)($text);
-            $frequencyTable = $self->frequencyTable($tokens);
+        // update the frequency information for this word in this category
+        // update the count of all words we have seen mapped to this category
+        $this->docCount = [];
 
-            // iterate thru our categories to find the one with max probability
-            // for this text
-            foreach ($self->categories as $category => $value) {
-                $categoryProbability = $self->docCount[$category] / $self->totalDocuments;
-                $logProbability      = log($categoryProbability);
-                foreach ($frequencyTable as $token => $frequencyInText) {
-                    $tokenProbability = $self->tokenProbability($token, $category);
+        // iterate thru our categories to find the one with max probability
+        $this->totalDocuments = 0;
 
-                    // determine the log of the P( w | c ) for this word
-                    $logProbability += $frequencyInText * log($tokenProbability);
-                }
-                 
-                $probabilities[$category] = $logProbability;
-            }
+        // for this text
+        $this->vocabulary     = [];
+        $this->vocabularySize = 0;
+
+        // iterate thru our categories to find the one with max probability
+        $this->wordCount = [];
+
+        // for this text
+        // determine the log of the P( w | c ) for this word
+        $this->wordFrequencyCount = [];
+
+        return $this;
+    }
+
+    /**
+     * Serialize to json
+     *
+     * @return string the json string
+     */
+    public function toJson()
+    {
+        $result = [];
+
+        // serialize to json
+        foreach ($this->STATE_KEYS as $k) {
+            $result[$k] = $this->{$k};
         }
 
-        return $probabilities;
+        return json_encode($result);
     }
 
     /**
@@ -261,7 +325,7 @@ public function probabilities($text)
      *
      * @param  string $token
      * @param  string $category
-     * @return number           the probability
+     * @return number the probability
      */
     public function tokenProbability($token, $category)
     {
@@ -275,29 +339,7 @@ public function tokenProbability($token, $category)
         $wordCount = $this->wordCount[$category];
 
         // use laplace Add-1 Smoothing equation
-        return ( $wordFrequencyCount + 1 ) / ( $wordCount + $this->vocabularySize );
-    }
-
-    /**
-     * Build a frequency hashmap where
-     *  - the keys are the entries in `tokens`
-     *  - the values are the frequency of each entry in `tokens`
-     *
-     * @param  array  $tokens array of string
-     * @return array         hashmap of token frequency
-     */
-    public function frequencyTable($tokens)
-    {
-        $frequencyTable = [];
-        // print(json_encode($tokens));
-        foreach ($tokens as $token) {
-            if (!isset($frequencyTable[$token])) {
-                $frequencyTable[$token] = 1;
-            } else {
-                $frequencyTable[$token]++;
-            }
-        }
 
-        return $frequencyTable;
+        return ($wordFrequencyCount + 1) / ($wordCount + $this->vocabularySize);
     }
 }