Ah. Thanks to both for your answers. I'll pre-process the input then - it's just a matter of removing all occurrences of the regex \\\n\s*. Usually when I get the urge to do something outside lex/yacc I assume it's just me not knowing how to use them properly, so that's why I asked. David: strings aren't a problem because there aren't any :) It's all arithmetic expressions and simple control flow statements.
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