By Jeroen Arnoldus, Mark van den Brand, A. Serebrenik, J.J. Brunekreef

ISBN-10: 9491216554

ISBN-13: 9789491216558

Templates are used to generate all types of textual content, together with computing device code. the decade, using templates received loads of recognition as a result elevate of dynamic net purposes. Templates are a device for programmers, and implementations of template engines are so much occasions in line with useful event instead of in response to a theoretical background.


This booklet unearths the mathematical historical past of templates and exhibits attention-grabbing findings for bettering the sensible use of templates.

First, a framework to figure out the mandatory computational energy for the template metalanguage is gifted. The template metalanguage doesn't must be Turing-complete to be worthwhile. A non-Turing-complete metalanguage enforces separation of issues among the view and version.

Second, syntactical correctness of all languages of the templates and generated code is ensured. This contains the syntactical correctness of the template metalanguage and the output language. 3rd, case experiences express that the completed targets are appropriate in perform. it really is even proven that syntactical correctness is helping to avoid cross-site scripting assaults in internet applications.


The target market of this e-book is twofold. the 1st staff exists of researcher attracted to the mathematical history of templates. the second one workforce exists of clients of templates. This contains designers of template engines on one aspect and programmers and internet designers utilizing templates at the different side

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Xr ← h(tr )} to the term t f . hΣ is called a linear tree homomorphism when no t f contains two occurrences of the same xr . Thus a linear tree homomorphism cannot copy trees. 4 (Tree homomorphism). Let Σ = {g( , , ), a, b} and Σ = { f ( , ), a, b}. Consider the tree homomorphism h determined by hΣ defined by: hΣ (g) = f (x1 , f (x2 , x3 )), hΣ (a) = a, hΣ (b) = b. For instance: If t = g(a, g(b, b, b), a), then h(t) = f (a, f ( f (b, f (b, b)), a)). 2 Context-free Grammars This book will focus on the generation of sentences of languages aimed to express programs executed or interpreted by a computer.

This metaprogram transforms an input tree with the Or signature to a concrete syntax representation without altering its meaning. 1 (Code generator). A code generator CG, instantiating sentences of a given L (Gcfg ) modulo layout, is a function producing at least two sentences of L (Gcfg ) and at most the set of sentences defined by L (Gcfg ). This definition excludes metaprograms producing exactly one sentence of L (Gcfg ): CG(x) = s, where s ∈ L (Gcfg ) and x matches every tree. The Metalanguage 53 No external information is necessary to complete the sentence; it is already complete.

Sr qr (xr )sr+1 , where q, q1 , . . , qr are transducer states. Application of the transducer to the abstract syntax tree consists in matching the tree against the pattern c(x1 , . . , xr ) and replacing it with a string originating from s1 q1 (x1 )s2 . . sr qr (xr )sr+1 , where q1 (x1 ), . . , qr (xr ) have been recursively applied to t1 , . . , q(c(t1 , . . ,tr )) = s1 · s1 · s2 · . . · sr · sr · sr+1 , where s1 = q1 (t1 ) . . sr = qr (tr ). In Chapter 4 this match-replace intuition will be used to define an eponymous construct in the unparser-complete metalanguage.

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Code Generation with Templates by Jeroen Arnoldus, Mark van den Brand, A. Serebrenik, J.J. Brunekreef

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