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TREE-META
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<p>The TREE-META (or Tree Meta, TREEMETA) Translator Writing System is a <a href="/facts/Compiler-compiler/Ud51JPrv">compiler-compiler</a> system for <a href="/facts/Context-free_language/sHDxB5So">context-free languages</a> originally developed in the 1960s. Parsing statements of the <a href="/facts/Metalanguage/peNXFNUV">metalanguage</a> resemble <a href="/facts/Augmented_Backus%25E2%2580%2593Naur_form/coNbJGD2">augmented Backus–Naur form</a> with embedded tree-building directives. Unparsing rules include extensive tree-scanning and code-generation constructs. </p>