Add `resolveValue` method to base Template.

DRYs up compiled class output a bit and makes things FASTER!

Speeds up value resolution by 33% for primitives, 25% for methods and properties, and 10% for lambdas.

src/Mustache/Compiler.php

@@ -275,12 +275,7 @@ class Mustache_Compiler
     }
 
     const VARIABLE = '
-        $value = $context->%s(%s);
-        if (!is_string($value) && is_callable($value)) {
-            $value = $this->mustache
-                ->loadLambda((string) call_user_func($value))
-                ->renderInternal($context, $indent);
-        }%s
+        $value = $this->resolveValue($context->%s(%s), $context, $indent);%s
         $buffer .= %s%s;
     ';
 

src/Mustache/Template.php

@@ -147,4 +147,26 @@ abstract class Mustache_Template
 
         return $stack;
     }
+
+    /**
+     * Resolve a context value.
+     *
+     * Invoke the value if it is callable, otherwise return the value.
+     *
+     * @param  mixed            $value
+     * @param  Mustache_Context $context
+     * @param  string           $indent
+     *
+     * @return string
+     */
+    protected function resolveValue($value, Mustache_Context $context, $indent = '')
+    {
+        if (!is_string($value) && is_callable($value)) {
+            return $this->mustache
+                ->loadLambda((string) call_user_func($value))
+                ->renderInternal($context, $indent);
+        }
+
+        return $value;
+    }
 }

test/Mustache/Test/CompilerTest.php

@@ -70,9 +70,9 @@ class Mustache_Test_CompilerTest extends PHPUnit_Framework_TestCase
                     "\nclass Monkey extends Mustache_Template",
                     '$buffer .= $indent . \'foo\'',
                     '$buffer .= "\n"',
-                    '$value = $context->find(\'name\');',
+                    '$value = $this->resolveValue($context->find(\'name\'), $context, $indent);',
                     '$buffer .= htmlspecialchars($value, ENT_COMPAT, \'UTF-8\');',
-                    '$value = $context->last();',
+                    '$value = $this->resolveValue($context->last(), $context, $indent);',
                     '$buffer .= \'\\\'bar\\\'\';',
                     'return $buffer;',
                 )