#!/bin/bash

COMMENT_STYLE="\x1b[37;2m"
KEYWORD_STYLE="\x1b[33;1m"
TYPES_STYLE="\x1b[36;6m"
STRING_STYLE="\x1b[32;6m"
NUMBER_STYLE="\x1b[32;6m"
RST="\x1b[0m"

COMMENT_REGEX="/\\*(.|[\\n\\r])*?\\*/|//.*|^\\#include\\s+[\\<\"].*?[\\>\"]$|^\\#define .*$"
KEYWORD_REGEX="\\b(attribute|const|goto|case|break|continue|do|for|while|if|else|bool|true|false|struct|reinterpret_cast|static_cast|NULL)\\b"
TYPES_REGEX="\\b(int|float|double|bool|u?int[0-9]{2}_t|char|void|byte)\\b"
STRING_REGEX="\".+?\""
NUMBER_REGEX="\\b(0x[A-Za-z0-9]+?|[0-9]+)\\b"

sed -E "s#$NUMBER_REGEX#$NUMBER_STYLE\0$RST#g"   | \
sed -E "s#$KEYWORD_REGEX#$KEYWORD_STYLE\0$RST#g" | \
sed -E "s#$TYPES_REGEX#$TYPES_STYLE\0$RST#g"     | \
sed -E "s#$COMMENT_REGEX#$COMMENT_STYLE\0$RST#g" | \
sed -E "s#$STRING_REGEX#$STRING_STYLE\0$RST#g"