initial commit of laravel!

system/lang.php

@@ -0,0 +1,178 @@
+<?php namespace System;
+
+class Lang {
+
+	/**
+	 * All of the loaded language files.
+	 *
+	 * @var array
+	 */
+	private static $loaded = array();
+
+	/**
+	 * All of the loaded language lines.
+	 *
+	 * @var array
+	 */
+	private static $lines = array();
+
+	/**
+	 * The key of the line that is being requested.
+	 *
+	 * @var string
+	 */
+	private $key;
+
+	/**
+	 * The place-holder replacements.
+	 *
+	 * @var array
+	 */
+	private $replacements = array();
+
+	/**
+	 * Create a new Lang instance.
+	 *
+	 * @param  string  $line
+	 * @return void
+	 */
+	public function __construct($key)
+	{
+		$this->key = $key;
+	}
+
+	/**
+	 * Create a Lang instance for a language line.
+	 *
+	 * @param  string  $key
+	 * @return Lang
+	 */
+	public static function line($key)
+	{
+		return new static($key);
+	}
+
+	/**
+	 * Get the language line for a given language.
+	 *
+	 * @param  string  $language
+	 * @return string
+	 */
+	public function get($language = null)
+	{
+		// --------------------------------------------------------------
+		// If no language was specified, use the default language.
+		// --------------------------------------------------------------
+		if (is_null($language))
+		{
+			$language = Config::get('application.language');
+		}
+
+		// --------------------------------------------------------------
+		// Extract the file and item from the key.
+		// --------------------------------------------------------------
+		list($file, $line) = $this->parse($this->key);
+
+		// --------------------------------------------------------------
+		// Load the language file.
+		// --------------------------------------------------------------
+		$this->load($file, $language);
+
+		// --------------------------------------------------------------
+		// Get the language line.
+		// --------------------------------------------------------------
+		if (array_key_exists($line, static::$lines[$language.$file]))
+		{
+			$line = static::$lines[$language.$file][$line];
+		}
+		else
+		{
+			throw new \Exception("Language line [$line] does not exist for language [$language]");
+		}
+
+		// --------------------------------------------------------------
+		// Make all place-holder replacements.
+		// --------------------------------------------------------------
+		foreach ($this->replacements as $key => $value)
+		{
+			$line = str_replace(':'.$key, $value, $line);
+		}
+
+		return $line;
+	}
+
+	/**
+	 * Parse a language key.
+	 *
+	 * @param  string  $key
+	 * @return array
+	 */
+	private function parse($key)
+	{
+		// ---------------------------------------------
+		// Get the key segments.
+		// ---------------------------------------------
+		$segments = explode('.', $key);
+
+		// ---------------------------------------------
+		// Validate the key format.
+		// ---------------------------------------------
+		if (count($segments) < 2)
+		{
+			throw new \Exception("Invalid language key [$key].");
+		}
+
+		// ---------------------------------------------
+		// Return the file and item name.
+		// ---------------------------------------------
+		return array($segments[0], implode('.', array_slice($segments, 1)));
+	}
+
+	/**
+	 * Load a language file.
+	 *
+	 * @param  string  $file
+	 * @param  string  $language
+	 * @return void
+	 */
+	private function load($file, $language)
+	{
+		// --------------------------------------------------------------
+		// Do not load the file if it has already been loaded.
+		// --------------------------------------------------------------
+		if (in_array($language.$file, static::$loaded))
+		{
+			return;
+		}
+
+		// --------------------------------------------------------------
+		// Does the language file exist?
+		// --------------------------------------------------------------
+		if (file_exists($path = APP_PATH.'lang/'.$language.'/'.$file.EXT))
+		{
+			static::$lines[$language.$file] = require $path;
+		}
+		else
+		{
+			throw new \Exception("Language file [$file] does not exist for language [$language].");
+		}
+
+		// --------------------------------------------------------------
+		// Add the file to the array of loaded files.
+		// --------------------------------------------------------------
+		static::$loaded[] = $language.$file;		
+	}
+
+	/**
+	 * Set the place-holder replacements.
+	 *
+	 * @param  array  $replacements
+	 * @return Lang 
+	 */
+	public function replace($replacements)
+	{
+		$this->replacements = $replacements;
+		return $this;
+	}
+
+}