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/usr/share/highlight/langDefs/euphoria.lang is in highlight-common 3.18-3.

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The actual contents of the file can be viewed below.

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Description="Euphoria"

Keywords={
  { Id=1,
    List={"and", "by", "constant", "do", "else", "elsif", "end", "exit", "for", 
"function", "global", "if", "include", "not", "or", "procedure", "return", 
"then", "to", "type", "while", "with", "without", "xor", "append", "arcsin", 
"arccos", "arctan", "and_bits", "allow_break", "abort", "all_palette", 
"allocate", "allocate_low", "allocate_string", "atom_to_float64", 
"atom_to_float32", "bk_color", "bytes_to_int", "bits_to_int", "compare", 
"custom_sort", "cos", "close", "current_dir", "chdir", "check_break", 
"command_line", "clear_screen", "cursor", "call", "crash_file", "crash_message", 
"call_proc", "call_func", "c_proc", "c_func", "call_back", "dir", "date", 
"display_text_image", "draw_line", "display_image", "dos_interrupt", 
"define_c_proc", "define_c_func", "define_c_var", "equal", "ellipse", "find", 
"floor", "flush", "free", "free_low", "float64_to_atom", "float32_to_atom", 
"free_console", "get", "getc", "gets", "get_bytes", "get_key", "get_mouse", 
"getenv", "get_position", "graphics_mode", 
    "get_all_palette", "get_active_page", "get_display_page", "get_screen_char", 
"get_pixel", "get_vector", "int_to_bytes", "int_to_bits", "instance", "length", 
"lower", "log", "lock_file", "lock_memory", "match", "mouse_events", 
"mouse_pointer", "machine_func", "machine_proc", "mem_copy", "mem_set", 
"message_box", "not_bits", "or_bits", "open", "open_dll", "pi", "prepend", 
"power", "print", "printf", "puts", "prompt_string", "prompt_number", 
"platform", "profile", "position", "palette", "put_screen_char", "pixel", 
"polygon", "peek", "peek4s", "peek4u", "poke", "poke4", "rand", "repeat", 
"reverse", "remainder", "read_bitmap", "register_block", "routine_id", "sin", 
"sort", "sqrt", "sprintf", "seek", "system", "system_exec", "sleep", "scroll", 
"save_bitmap", "set_active_page", "set_display_page", "sound", 
"save_text_image", "save_screen", "save_image", "set_vector", "set_rand", "tan", 
"time", "tick_rate", "trace", "text_color", "text_rows", "upper", "unlock_file", 
"unregister_block", "use_vesa", "value", "video_config", 
    "wildcard_match", "wildcard_file", "wait_key", "where", "walk_dir", "wrap", "xor_bits"},
  },
  { Id=2,
    List={"atom", "integer", "object", "sequence"},
  },
  { Id=3,
    Regex=[=[\#[[:xdigit:]]+]=],
  },
  { Id=4,
    Regex=[[(\w+)\s*\(]],
  },
}

Strings={
  Delimiter=[["|']],
  Interpolation=[[ %\w ]],
}

IgnoreCase=true

Comments={
  { Block=false,
    Delimiter= { [[--]] },
  },
}

Operators=[[\(|\)|\[|\]|\{|\}|\,|\;|\:|\&|<|>|\!|\?|\=|\/|\*|\%|\+|\-|\.]]