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+            },
+            "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": "2016-11-23T20:04:58+00:00"
+        }
+    ],
+    "aliases": [],
+    "minimum-stability": "stable",
+    "stability-flags": [],
+    "prefer-stable": false,
+    "prefer-lowest": false,
+    "platform": [],
+    "platform-dev": []
+}
diff --git a/readme.md b/readme.md
new file mode 100644
index 0000000..03416c7
--- /dev/null
+++ b/readme.md
@@ -0,0 +1,41 @@
+# Basic Query Filter
+
+This started out as a weekend-project. A DSL Parser for a filter query langague that
+primarily can be used in an API or similar setting where filtering is based on predicate logic.
+
+## Install
+
+```
+composer require "ralphschindler/basic-query-filter"
+```
+
+## Usage
+
+Basic usage is to take a string and parse it, using the ParseTree to be able to convert the
+expressions to whatever is required by the library you are adjoining.
+
+```php
+$parseTree = (new QueryFilter\Parser)->parse($filter);
+foreach ($parseTree->getPredicates() as $predicateInfo) {
+    list($combinedBy, $predicate) = $predicateInfo;
+    // ...    
+}
+```
+
+### Laravel
+
+Expand usage as necessary to accommodate more filtering features.
+
+```php
+// $modelQuery is a Model::newQuery() instance (Illuminate\Database\Eloquent\Builder)
+
+foreach ($parseTree->getPredicates() as $predicateInfo) {
+    list($combinedBy, $predicate) = $predicateInfo;
+    $op = ($predicate->op == '=~') ? 'like' : $predicate->op;
+    if ($combinedBy === 'OR') {
+        $modelQuery->orWhere((string)$predicate->left, $op, $predicate->right);
+    } else {
+        $modelQuery->where((string)$predicate->left, $op, $predicate->right);
+    }
+}
+```
\ No newline at end of file
diff --git a/src/Comparison.php b/src/Comparison.php
new file mode 100644
index 0000000..5c75af2
--- /dev/null
+++ b/src/Comparison.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace BasicQueryFilter;
+
+class Comparison implements PredicateInterface
+{
+    public $left, $op, $right;
+    public $leftType = self::TYPE_IDENTIFIER, $rightType = self::TYPE_VALUE;
+}
+
diff --git a/src/Identifier.php b/src/Identifier.php
new file mode 100644
index 0000000..1f68973
--- /dev/null
+++ b/src/Identifier.php
@@ -0,0 +1,18 @@
+<?php
+
+namespace BasicQueryFilter;
+
+class Identifier
+{
+    public $name = null, $field;
+
+    public function toString()
+    {
+        return $this->__toString();
+    }
+
+    public function __toString()
+    {
+        return ($this->name) ? "{$this->name}.{$this->field}" : $this->field;
+    }
+}
diff --git a/src/ParseTree.php b/src/ParseTree.php
new file mode 100644
index 0000000..413dd3a
--- /dev/null
+++ b/src/ParseTree.php
@@ -0,0 +1,40 @@
+<?php
+
+namespace BasicQueryFilter;
+
+class ParseTree
+{
+    const COMBINED_BY_AND = 'AND';
+    const COMBINED_BY_OR = 'OR';
+    /** @var PredicateInterface[] */
+    public $predicates = [];
+    protected $nestParent = null;
+
+    public function getPredicates()
+    {
+        return $this->predicates;
+    }
+
+    public function addPredicate(PredicateInterface $predicate, $combinedBy = self::COMBINED_BY_AND)
+    {
+        if (!in_array($combinedBy, [self::COMBINED_BY_AND, self::COMBINED_BY_OR])) {
+            throw new \InvalidArgumentException('Must be combined by AND or OR');
+        }
+        $this->predicates[] = [$combinedBy, $predicate];
+    }
+
+    public function nest()
+    {
+        $parseTree = new static;
+        $parseTree->nestParent = $this;
+        return $parseTree;
+    }
+
+    public function unnest()
+    {
+        $parent = $this->nestParent;
+        $this->nestParent = null;
+        return $parent;
+    }
+}
+
diff --git a/src/Parser.php b/src/Parser.php
new file mode 100644
index 0000000..b9d1844
--- /dev/null
+++ b/src/Parser.php
@@ -0,0 +1,202 @@
+<?php
+
+namespace BasicQueryFilter;
+
+class Parser
+{
+    const T_WHITESPACE = 0;
+    const T_GENERIC_SYMBOL = 1;
+    const T_IDENTIFIER = 2;
+    const T_IDENTIFIER_SEPARATOR = 3;
+    const T_VALUE = 4;
+    const T_COMPARISON_OPERATOR = 5;
+    const T_PRECEDENCE_OPERATOR = 6;
+    const T_LOGIC_OPERATOR = 7;
+
+    protected $tokens = [];
+    protected $tokenIndex = 0;
+
+    /**
+     * @param $input
+     * @return ParseTree
+     */
+    public function parse($input)
+    {
+        $segments = preg_split(
+            '#([a-z-_\\\][a-z0-9-_\\\:]*[a-z0-9_]{1})|((?:[0-9]+(?:[\.][0-9]+)*)(?:e[+-]?[0-9]+)?)|(\'(?:[^\']|\'\')*\')|("(?:[^"]|"")*")|([!><=~]{1,2})|(\s+)|(.)#i',
+            $input,
+            -1,
+            PREG_SPLIT_NO_EMPTY | PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_OFFSET_CAPTURE
+        );
+        $this->tokens = [];
+        foreach ($segments as $segment) {
+            $type = $this->getTokenType($segment[0]);
+            $this->tokens[] = [
+                'value' => $segment[0],
+                'type'  => $type,
+                'position' => $segment[1],
+            ];
+        }
+
+        $parseTree = new ParseTree;
+        $token = $this->currentToken();
+        $logic = ParseTree::COMBINED_BY_AND;
+        while ($token) {
+            switch (true) {
+                case ($token['type'] == self::T_LOGIC_OPERATOR):
+                    $logic = (in_array(strtolower($token['value']), ['or', '||'])) ? ParseTree::COMBINED_BY_OR : ParseTree::COMBINED_BY_AND;
+                    break;
+                case ($token['type'] == self::T_PRECEDENCE_OPERATOR && $token['value'] == '('):
+                    $parseTree = $parseTree->nest();
+                    break;
+                case ($token['type'] == self::T_PRECEDENCE_OPERATOR && $token['value'] == ')'):
+                    $parseTree = $parseTree->unnest();
+                    break;
+                case ($token['type'] == self::T_IDENTIFIER):
+                    $parseTree->addPredicate($this->parsePredicate(), $logic);
+                    break;
+                default:
+                    throw new ParserException("Was expecting a Logic Operator (and, or, &&, ||), Precendence Operator ) or (, or an Identifier (' after {$token['value']}");
+            }
+            $token = $this->nextToken();
+        }
+
+        return $parseTree;
+    }
+
+    protected function getTokenType(&$value)
+    {
+        $type = self::T_GENERIC_SYMBOL;
+
+        switch (true) {
+            case (trim($value) === ''):
+                return self::T_WHITESPACE;
+
+            case ($value == '.'):
+                return self::T_IDENTIFIER_SEPARATOR;
+
+            case (is_numeric($value) || is_numeric($value[0])):
+                return self::T_VALUE;
+
+            case ($value[0] === "'"):
+                $value = str_replace("''", "'", substr($value, 1, strlen($value) - 2));
+                return self::T_VALUE;
+
+            case ($value[0] === '"'):
+                $value = str_replace('""', '"', substr($value, 1, strlen($value) - 2));
+                return self::T_VALUE;
+
+            case ($value == '(' || $value == ')'):
+                return self::T_PRECEDENCE_OPERATOR;
+
+            case (in_array($value{0}, ['=', '>', '<', '!'])):
+                return self::T_COMPARISON_OPERATOR;
+
+            case (in_array(strtolower($value), ['and', 'or', '&&', '||'])):
+                return self::T_LOGIC_OPERATOR;
+
+            case (ctype_alpha($value[0])):
+                return self::T_IDENTIFIER;
+
+        }
+        return $type;
+    }
+
+    protected function currentToken()
+    {
+        if (!isset($this->tokens[$this->tokenIndex])) {
+            return false;
+        }
+        return $this->tokens[$this->tokenIndex];
+    }
+
+    protected function nextToken()
+    {
+        INCREMENT_TOKEN:
+        ++$this->tokenIndex;
+
+        if (!isset($this->tokens[$this->tokenIndex])) {
+            return false;
+        }
+
+        if ($this->tokens[$this->tokenIndex]['type'] === self::T_WHITESPACE) {
+            goto INCREMENT_TOKEN;
+        }
+
+        return $this->tokens[$this->tokenIndex];
+    }
+
+    protected function peekToken($increment = 1)
+    {
+        if (!isset($this->tokens[$this->tokenIndex + $increment])) {
+            return false;
+        }
+        return $this->tokens[($this->tokenIndex + $increment)];
+    }
+
+    protected function parsePredicate()
+    {
+        $identifier = new Identifier;
+        $identifier->field = $this->currentToken()['value'];
+        $token = $this->nextToken();
+        if ($token['type'] == self::T_IDENTIFIER_SEPARATOR) {
+            $identifier->name = $identifier->field;
+            $token = $this->nextToken();
+            if ($token['type'] !== self::T_IDENTIFIER) {
+                throw new ParserException('Parser error: predicate expects an identifier (unquoted string) after an identifier separator (dot)');
+            }
+            $identifier->field = $token['value'];
+            $token = $this->nextToken();
+        }
+
+        if ($token['type'] !== self::T_COMPARISON_OPERATOR && $token['type'] !== self::T_COMPARISON_OPERATOR) {
+            throw new ParserException('A function name or comparison operator must follow an identifer');
+        }
+
+        if ($token['type'] == self::T_COMPARISON_OPERATOR) {
+            $operator = $token['value'];
+            $token = $this->nextToken();
+            $peekToken = $this->peekToken();
+
+            if ($token['type'] !== self::T_IDENTIFIER && $token['type'] !== self::T_VALUE) {
+                throw new ParserException('Comparisons must have an identifier or value on the right side');
+            }
+
+            $predicate = new Comparison();
+            $predicate->leftType = Comparison::TYPE_IDENTIFIER;
+            $predicate->left = $identifier;
+            $predicate->op = $operator;
+
+            if ($token['type'] == self::T_IDENTIFIER) {
+                $predicate->rightType = Comparison::TYPE_IDENTIFIER;
+                $predicate->right = new Identifier();
+
+                if ($peekToken && $peekToken['type'] === self::T_IDENTIFIER_SEPARATOR) {
+                    $predicate->right->name = $token['value'];
+
+                    $this->nextToken(); // separator token
+                    $token = $this->nextToken();
+                    $peekToken = $this->peekToken();
+
+                    $predicate->right->field = $token['value'];
+                } else {
+                    $predicate->right->field = $token['value'];
+                }
+            } else {
+                $predicate->rightType = Comparison::TYPE_VALUE;
+                $predicate->right = $token['value'];
+            }
+
+            if ($peekToken && !in_array($peekToken['type'], [self::T_WHITESPACE, self::T_PRECEDENCE_OPERATOR])) {
+                $type = ($token['type'] === self::T_IDENTIFIER) ? 'identifier' : 'value';
+                throw new ParserException("Expected the *$type* {$token['value']} to be followed by whitespace or a ), was followed by {$peekToken['value']}");
+            }
+        } else {
+            throw new ParserException('Non-comparison not supported');
+        }
+
+
+
+        return $predicate;
+    }
+}
diff --git a/src/ParserException.php b/src/ParserException.php
new file mode 100644
index 0000000..a1bb5de
--- /dev/null
+++ b/src/ParserException.php
@@ -0,0 +1,7 @@
+<?php
+
+namespace BasicQueryFilter;
+
+class ParserException extends \RuntimeException
+{
+}
diff --git a/src/PredicateInterface.php b/src/PredicateInterface.php
new file mode 100644
index 0000000..be59075
--- /dev/null
+++ b/src/PredicateInterface.php
@@ -0,0 +1,9 @@
+<?php
+
+namespace BasicQueryFilter;
+
+interface PredicateInterface
+{
+    const TYPE_IDENTIFIER = 'identifier';
+    const TYPE_VALUE = 'value';
+}
diff --git a/tests/QueryFilterTest.php b/tests/QueryFilterTest.php
new file mode 100644
index 0000000..be28808
--- /dev/null
+++ b/tests/QueryFilterTest.php
@@ -0,0 +1,117 @@
+<?php
+
+namespace Test;
+
+use PHPUnit\Framework\TestCase;
+use BasicQueryFilter\Identifier;
+use BasicQueryFilter\Parser;
+use BasicQueryFilter\ParserException;
+use BasicQueryFilter\PredicateInterface;
+
+class QueryFilterTest extends TestCase
+{
+    /**
+     * @dataProvider parserSuccessData
+     */
+    public function testParserSuccess($filter, $predicateSpecs)
+    {
+        $parser = new Parser();
+        $tree = $parser->parse($filter);
+        $predicates = $tree->getPredicates();
+
+        $this->assertCount(count($predicateSpecs), $predicates);
+
+        foreach ($predicateSpecs as $i => $predicateSpec) {
+            $predicateInfo = $predicates[$i];
+            $this->assertEquals($predicateSpec[0], $predicateInfo[0]);
+
+            $predicate = $predicateInfo[1];
+
+            // left
+            if ($predicateSpec[1][0] === PredicateInterface::TYPE_IDENTIFIER) {
+                $this->assertInstanceOf(Identifier::class, $predicate->left);
+                $this->assertEquals(PredicateInterface::TYPE_IDENTIFIER, $predicate->leftType);
+                $this->assertEquals($predicateSpec[1][1], $predicate->left->toString());
+            } else {
+                $this->assertEquals(PredicateInterface::TYPE_VALUE, $predicate->leftType);
+                $this->assertEquals($predicateSpec[1][1], $predicate->left);
+            }
+
+            $this->assertEquals($predicateSpec[2], $predicate->op);
+
+            // right
+            if ($predicateSpec[3][0] === PredicateInterface::TYPE_IDENTIFIER) {
+                $this->assertInstanceOf(Identifier::class, $predicate->right);
+                $this->assertEquals(PredicateInterface::TYPE_IDENTIFIER, $predicate->rightType);
+                $this->assertEquals($predicateSpec[3][1], $predicate->right->toString());
+            } else {
+                $this->assertEquals(PredicateInterface::TYPE_VALUE, $predicate->rightType);
+                $this->assertEquals($predicateSpec[3][1], $predicate->right);
+            }
+        }
+    }
+
+    public function parserSuccessData()
+    {
+        return [
+            [
+                'foo = "Bar"',
+                [
+                    ['AND', [PredicateInterface::TYPE_IDENTIFIER, 'foo'], '=', [PredicateInterface::TYPE_VALUE, 'Bar']]
+                ]
+            ],
+            [
+                'foo = bar',
+                [
+                    ['AND', [PredicateInterface::TYPE_IDENTIFIER, 'foo'], '=', [PredicateInterface::TYPE_IDENTIFIER, 'bar']]
+                ]
+            ],
+            [
+                'foo > 5',
+                [
+                    ['AND', [PredicateInterface::TYPE_IDENTIFIER, 'foo'], '>', [PredicateInterface::TYPE_VALUE, '5']]
+                ]
+            ],
+            [
+                'foo != "200" AND created_at > "2015-01-01"',
+                [
+                    ['AND', [PredicateInterface::TYPE_IDENTIFIER, 'foo'], '!=', [PredicateInterface::TYPE_VALUE, '200']],
+                    ['AND', [PredicateInterface::TYPE_IDENTIFIER, 'created_at'], '>', [PredicateInterface::TYPE_VALUE, '2015-01-01']]
+                ]
+            ],
+            [
+                'foo.bar = boom.baz',
+                [
+                    ['AND', [PredicateInterface::TYPE_IDENTIFIER, 'foo.bar'], '=', [PredicateInterface::TYPE_IDENTIFIER, 'boom.baz']]
+                ]
+            ]
+        ];
+    }
+
+    /**
+     * @dataProvider parserExceptionData
+     */
+    public function testParserException($filter, $message)
+    {
+        $parser = new Parser();
+        $this->expectExceptionMessage($message);
+        $this->expectException(ParserException::class);
+        $parser->parse($filter);
+    }
+
+    public function parserExceptionData()
+    {
+        $expectingMessage = function ($type, $current, $next) {
+            return "Expected the *$type* $current to be followed by whitespace or a ), was followed by $next";
+        };
+
+
+        return [
+            ['foo = 2005-01', $expectingMessage('value', '2005', '-01')],
+            ['foo=2005-01', $expectingMessage('value', '2005', '-01')],
+            ['foo = "2005-01"x', $expectingMessage('value', '2005-01', 'x')],
+            ['foo = boo/x', $expectingMessage('identifier', 'boo', '/')],
+        ];
+    }
+
+}
\ No newline at end of file
diff --git a/unlicense.txt b/unlicense.txt
new file mode 100644
index 0000000..00d2e13
--- /dev/null
+++ b/unlicense.txt
@@ -0,0 +1,24 @@
+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <http://unlicense.org/>
\ No newline at end of file