Extract expression parser

Author: ockham

src/directives/utils.php

@@ -0,0 +1,13 @@
+<?php
+
+function get_from_context( $expr, $context ) {
+	$path = explode( '.', $expr );
+	if ( count( $path ) > 0 && 'context' === $path[0] ) {
+		array_shift( $path );
+		$result = $context;
+		foreach( $path as $key ) {
+			$result = $result[$key];
+		}
+	}
+    return $result;
+}

src/directives/wp-show.php

@@ -1,26 +1,23 @@
 <?php
 
+require_once __DIR__ . '/utils.php';
+
 function process_wp_show( &$tags, &$context ) {
 	if ( 'WP-SHOW' === $tags->get_tag() ) {
 		$value = $tags->get_attribute( 'when' );
 	} else {
 		$value = $tags->get_attribute( 'wp-data' );
 	}
 
-	if ( null !== $value ) {
-		// TODO: Properly parse $value.
-		$path = explode( '.', $value );
-		if ( count( $path ) > 0 && 'context' === $path[0] ) {
-			array_shift( $path );
-			$show = $context;
-			foreach( $path as $key ) {
-				$show = $show[$key];
-			}
-		}
+	if ( null === $value ) {
+		return;
+	}
+
+	// TODO: Properly parse $value.
+	$show = get_from_context( $value, $context );
 
-		if( ! $show ) {
-			// $content = $tags->get_content_inside_balanced_tags()
-			// $tags->set_content_inside_balanced_tags( '<template>' . $content . '</template>' );
-		}
+	if( ! $show ) {
+		// $content = $tags->get_content_inside_balanced_tags()
+		// $tags->set_content_inside_balanced_tags( '<template>' . $content . '</template>' );
 	}
 }