From 6203cadcae3a251ad8b8ed13b4a75b0a31ef6e56 Mon Sep 17 00:00:00 2001
From: Neil Fraser <fraser@google.com>
Date: Fri, 9 Mar 2018 16:16:23 -0800
Subject: [PATCH] Move away from math.log10 and math.pow in Lua generators.

Fixes #1695
---
 generators/lua/math.js | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/generators/lua/math.js b/generators/lua/math.js
index c104bfc16..b60d023da 100644
--- a/generators/lua/math.js
+++ b/generators/lua/math.js
@@ -66,9 +66,14 @@ Blockly.Lua['math_single'] = function(block) {
         Blockly.Lua.ORDER_UNARY) || '0';
     return ['-' + arg, Blockly.Lua.ORDER_UNARY];
   }
-  if (operator == 'SIN' || operator == 'COS' || operator == 'TAN') {
+  if (operator == 'POW10') {
     arg = Blockly.Lua.valueToCode(block, 'NUM',
-        Blockly.Lua.ORDER_MULTIPLICATIVE) || '0';
+        Blockly.Lua.ORDER_EXPONENTIATION) || '0';
+    return ['10 ^ ' + arg, Blockly.Lua.ORDER_EXPONENTIATION];
+  }
+  if (operator == 'ROUND') {
+    arg = Blockly.Lua.valueToCode(block, 'NUM',
+        Blockly.Lua.ORDER_ADDITIVE) || '0';
   } else {
     arg = Blockly.Lua.valueToCode(block, 'NUM',
         Blockly.Lua.ORDER_NONE) || '0';
@@ -84,14 +89,11 @@ Blockly.Lua['math_single'] = function(block) {
       code = 'math.log(' + arg + ')';
       break;
     case 'LOG10':
-      code = 'math.log10(' + arg + ')';
+      code = 'math.log(' + arg + ', 10)';
       break;
     case 'EXP':
       code = 'math.exp(' + arg + ')';
       break;
-    case 'POW10':
-      code = 'math.pow(10,' + arg + ')';
-      break;
     case 'ROUND':
       // This rounds up.  Blockly does not specify rounding direction.
       code = 'math.floor(' + arg + ' + .5)';