1. A method comprising: receiving at an input compiler scanning and parsing module of a computing device a unified input description containing syntax rules for both regular and context-free expressions and interspersed code; generating with the computing device a common internal representation from the unified input description, wherein the common internal representation stores information on every attribute used in a grammar rule; checking regular expressions in the common internal representation with a regular expression checker of the computing device; checking context-free expressions in the common representation with context-free expression checker of the computing device; checking the interspersed code, checking including checking the interspersed code and usage of the attributes for correctness or violations and violations are reported as error messages; and outputting from a code generator of the computing device an executable, formed from the unified input description, the executable operating as a compiler.