Allow to get a char in a string with hooks

Author: kylekatarnls

examples/string-char-at.js

@@ -0,0 +1,3 @@
+var str = 'abc';
+
+return str[1];

examples/string-char-at.return

@@ -0,0 +1 @@
+b

src/JsPhpize/Compiler/Compiler.php

@@ -250,9 +250,9 @@ protected function visitFunctionCall(FunctionCall $functionCall, $indent)
                 return $staticCall;
             }
 
-            return 'function_exists(' . var_export($name, true) . ') ? ' .
+            return '(function_exists(' . var_export($name, true) . ') ? ' .
                 $staticCall . ' : ' .
-                $dynamicCall;
+                $dynamicCall . ')';
         }
 
         if (count($functionCall->children)) {

src/JsPhpize/Compiler/Helpers/Dot.h

@@ -17,6 +17,9 @@ function ($base) {
     };
     $fallbackDot = function ($base, $key) use ($getCallable, $getRegExp) {
         if (is_string($base)) {
+            if (preg_match('/^[-+]?\d+$/', strval($key))) {
+                return substr($base, intval($key), 1);
+            }
             if ($key === 'substr' || $key === 'slice') {
                 return function ($start, $length = null) use ($base) {
                     return func_num_args() === 1 ? substr($base, $start) : substr($base, $start, $length);

src/JsPhpize/Compiler/Helpers/DotObject.h

@@ -17,6 +17,9 @@ function ($base) {
     };
     $fallbackDot = function ($base, $key) use ($getCallable, $getRegExp) {
         if (is_string($base)) {
+            if (preg_match('/^[-+]?\d+$/', strval($key))) {
+                return substr($base, intval($key), 1);
+            }
             if ($key === 'substr' || $key === 'slice') {
                 return function ($start, $length = null) use ($base) {
                     return func_num_args() === 1 ? substr($base, $start) : substr($base, $start, $length);

src/JsPhpize/Compiler/Helpers/DotWithArrayPrototype.h

@@ -93,6 +93,9 @@ function ($base) {
     };
     $fallbackDot = function ($base, $key) use ($getCallable, $getRegExp) {
         if (is_string($base)) {
+            if (preg_match('/^[-+]?\d+$/', strval($key))) {
+                return substr($base, intval($key), 1);
+            }
             if ($key === 'substr' || $key === 'slice') {
                 return function ($start, $length = null) use ($base) {
                     return func_num_args() === 1 ? substr($base, $start) : substr($base, $start, $length);