better-testing

Field.php
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			<?php

			namespace RESTful;

			class Field
			{
			public $name;

			public function __construct($name)
			{
			$this->name = $name;
			}

			public function __get($name)
			{
			return new Field($this->name . '.' . $name);
			}

			public function in($vals)
			{
			return new FilterExpression($this->name, 'in', $vals, '!in');
			}

			public function startswith($prefix)
			{
			if (!is_string($prefix)) {
			throw new \InvalidArgumentException('"startswith" prefix must be a string');
			}

			return new FilterExpression($this->name, 'contains', $prefix);
			}

			public function endswith($suffix)
			{
			if (!is_string($suffix)) {
			throw new \InvalidArgumentException('"endswith" suffix must be a string');
			}

			return new FilterExpression($this->name, 'contains', $suffix);
			}

			public function contains($fragment)
			{
			if (!is_string($fragment)) {
			throw new \InvalidArgumentException('"contains" fragment must be a string');
			}

			return new FilterExpression($this->name, 'contains', $fragment, '!contains');
			}

			public function eq($val)
			{
			return new FilterExpression($this->name, '=', $val, '!eq');
			}

			public function lt($val)
			{
			return new FilterExpression($this->name, '<', $val, '>=');
			}

			public function lte($val)
			{
			return new FilterExpression($this->name, '<=', $val, '>');
			}

			public function gt($val)
			{
			return new FilterExpression($this->name, '>', $val, '<=');
			}

			public function gte($val)
			{
			return new FilterExpression($this->name, '>=', $val, '<');
			}

			public function asc()
			{
			return new SortExpression($this->name, true);
			}

			public function desc()
			{
			return new SortExpression($this->name, false);
			}
			}