diff --git a/core.cpp b/core.cpp
index c08b51b..0f931ca 100644
--- a/core.cpp
+++ b/core.cpp
@@ -274,7 +274,7 @@ list<string> strSplit(Arena *arena, string splitStr, string inputStr) {
     return result;
 }
 
-int8 parsePositiveInt(string str, size_t *lengthPointer) {
+ParsePositiveIntResult parsePositiveInt(string str, size_t *lengthPointer) {
     size_t numEnd = 0;
     char currChar = str.str[numEnd];
     while (numEnd < str.length && isNumeric(currChar)) {
@@ -288,14 +288,14 @@ int8 parsePositiveInt(string str, size_t *lengthPointer) {
             result *= 10;
             result += str.str[i] - '0';
         }
-        return result;
+        return {result, true};
     } else {
-        return -1;
+        return {0, false};
     }
 }
 
-real32 parsePositiveReal32(string str, size_t *lengthPointer) {
-    real32 result = NAN;
+ParsePositiveReal32Result parsePositiveReal32(string str, size_t *lengthPointer) {
+    ParsePositiveReal32Result result = {NAN, false};
 
     string wholePartStr = string{0};
     string fractionalPartStr = string{0};
@@ -314,16 +314,21 @@ real32 parsePositiveReal32(string str, size_t *lengthPointer) {
         c++;
     }
     if (split) {
-        int wholePart = parsePositiveInt(wholePartStr, lengthPointer);
+        ParsePositiveIntResult wholePartParsed = parsePositiveInt(wholePartStr, lengthPointer);
         *lengthPointer += 1;
-        int fractionalPart = parsePositiveInt(fractionalPartStr, lengthPointer);
-        if (wholePart >= 0 && fractionalPart >= 0) {
+        ParsePositiveIntResult fractionalPartParsed = parsePositiveInt(fractionalPartStr, lengthPointer);
+        if (wholePartParsed.valid && fractionalPartParsed.valid) {
             // TODO(dledda): implement powf with intrinsics? or just custom
             real32 fractionalPartMultiplier = 1.0f / powf(10.0f, (real32)fractionalPartStr.length);
-            result = (real32)wholePart + (real32)fractionalPart * (real32)fractionalPartMultiplier;
+            result.result = (real32)wholePartParsed.result + (real32)fractionalPartParsed.result * (real32)fractionalPartMultiplier;
+            result.valid = true;
         }
     } else if (c > 0) {
-        result = (real32)parsePositiveInt(str, lengthPointer);
+        ParsePositiveIntResult intPartParsed = parsePositiveInt(str, lengthPointer);
+        if (intPartParsed.valid) {
+            result.result = (real32)intPartParsed.result;
+            result.valid = true;
+        }
     }
     return result;
 }
diff --git a/core.h b/core.h
index 2889d13..257cb65 100644
--- a/core.h
+++ b/core.h
@@ -176,8 +176,10 @@ list<string> strSplit(Arena *arena, string splitStr, string inputStr);
 string strPrintfv(Arena *arena, const char *fmt, va_list args);
 string strPrintf(Arena *arena, const char *fmt, ...);
 
-int8 parsePositiveInt(string str, size_t *lengthPointer); 
-real32 parsePositiveReal32(Arena *arena, string str, size_t *lengthPointer); 
+struct ParsePositiveIntResult { uint8 result; bool valid; };
+ParsePositiveIntResult parsePositiveInt(string str, size_t *lengthPointer); 
+struct ParsePositiveReal32Result { real32 result; bool valid; };
+ParsePositiveReal32Result parsePositiveReal32(Arena *arena, string str, size_t *lengthPointer); 
 
 inline function bool isNumeric(char c); 
 
@@ -206,6 +208,52 @@ enum LogTarget {
     LogTarget_count,
 };
 
+#define ANSI_INSTRUCTION_FROM_ENUM(ansiCodeEnum) ANSI_INSTRUCTION(ansiCodeEnum)
+#define ANSI_INSTRUCTION(ansiCode) "\u001b[" #ansiCode "m"
+#define ANSI_INSTRUCTION_STR(ansiCodeStr) "\u001b[" ansiCodeStr "m"
+#define ANSI_RESET ANSI_INSTRUCTION(0)
+
+#define ANSI_fg_black 30
+#define ANSI_fg_red 31
+#define ANSI_fg_green 32
+#define ANSI_fg_yellow 33
+#define ANSI_fg_blue 34
+#define ANSI_fg_magenta 35
+#define ANSI_fg_cyan 36
+#define ANSI_fg_white 37
+
+#define ANSI_fg_bblack 90
+#define ANSI_fg_bred 91
+#define ANSI_fg_bgreen 92
+#define ANSI_fg_byellow 93
+#define ANSI_fg_bblue 94
+#define ANSI_fg_bmagenta 95
+#define ANSI_fg_bcyan 96
+#define ANSI_fg_bwhite 97
+
+#define ANSI_bg_black 40
+#define ANSI_bg_red 41
+#define ANSI_bg_green 42
+#define ANSI_bg_yellow 43
+#define ANSI_bg_blue 44
+#define ANSI_bg_magenta 45
+#define ANSI_bg_cyan 46
+#define ANSI_bg_white 47
+
+#define ANSI_bg_bblack 100
+#define ANSI_bg_bred 101
+#define ANSI_bg_bgreen 102
+#define ANSI_bg_byellow 103
+#define ANSI_bg_bblue 104
+#define ANSI_bg_bmagenta 105
+#define ANSI_bg_bcyan 106
+#define ANSI_bg_bwhite 107
+
+#define COLOR_TEXT(text, foregroundcolor) ANSI_INSTRUCTION_FROM_ENUM(foregroundcolor) text ANSI_RESET
+#define COLOR_TEXT_BG(text, backgroundcolor) ANSI_INSTRUCTION_FROM_ENUM(backgroundcolor) text ANSI_RESET
+#define COLOR_TEXT_FG_BG(text, foregroundcolor, backgroundcolor) ANSI_INSTRUCTION_FROM_ENUM(foregroundcolor) ANSI_INSTRUCTION_FROM_ENUM(backgroundcolor) text  ANSI_RESET
+#define COLOR_TEXT_RGB(text, red, green, blue) ANSI_INSTRUCTION_STR("38;2;" #red ";" #green ";" #blue) text ANSI_RESET
+
 void log(list<int> l, LogTarget target = LogTarget_stdout);
 void log(list<string> l, LogTarget target = LogTarget_stdout);
 void log(const char *fmt, ...);