WHITESPACE  = _{ " " | "\t" }                // Allow tabs and multiple spaces
instruction = { ASCII_ALPHA+ }               // Instruction, e.g., "CLS" or "LDX"
parameter   = { ("0x" | "0X") ~ ASCII_HEX_DIGIT+ }    // Parameter format, e.g., "0X250"
comment     = { ";" ~ (!"\n" ~ ANY)* }       // Capture everything after ";", up to end of line
parameters  = { (parameter ~ (WHITESPACE* ~ ","* ~ WHITESPACE* ~ parameter)*)?}  // Zero or more parameters
record      = { instruction ~ WHITESPACE* ~ parameters ~ WHITESPACE* ~ comment? }  // Record structure
file        = { SOI ~ (record ~ (("\r\n" | "\n") | WHITESPACE*))* ~ EOI }  // Allow for trailing newlines and empty lines