Create DynamicString.php

lastguest · lastguest · commit 9e55e01d6257 · 2015-01-13T23:47:18.000+01:00
diff --git a/src/DynamicString.php b/src/DynamicString.php
@@ -0,0 +1,63 @@
+<?php
+
+/**
+ * DynamicString template render
+ *
+ * @author Stefano Azzolini <lastguest@gmail.com>
+ */
+
+class  DynamicString {
+
+    protected $group_left,
+              $group_right,
+              $group_rx,
+              $replacer;
+
+    /**
+     * Create a DynamicString instance for a specified group/separator
+     * @param string $group     A String containing an empty group envelope
+     * @param string $separator The choice separator
+     */
+    
+    public function  __construct($group='()', $separator='|'){
+
+        // Check if group delimiters are balanced.
+        $l = strlen($group);
+        if ($l%2) throw new Exception("Group delimiter must be balanced.");
+
+        // Get left-right group delimiter
+        list($this->group_left, $this->group_right) = str_split($group, $l>>1);
+
+        // Build group regular expression
+        $this->group_rx =
+            "(\\".$this->group_left
+             ."([^"
+               .$this->group_left.$this->group_right
+             ."]+)\\".$this->group_right
+           .")x";
+
+        $this->replacer = function($m) use ($separator){
+            // Get one random choice
+            $choice = array_rand($options = explode($separator, $m[1]),1);
+            return $options[$choice];
+        };
+    }
+
+    /**
+     * Render a new randomized instance of passed template.
+     * @param  string $template The generator template
+     * @return string           The random rendered version
+     */
+    
+    public function render($template){
+
+        // While there are groups, resolve them
+        while (false !== strpos($template, $this->group_left)) {
+            $template = preg_replace_callback($this->group_rx, $this->replacer, $template);
+        }
+
+        // Return rendered template
+        return $template;
+    }
+
+}
