By Atze Dijkstra, S. Doaitse Swierstra (auth.), Varmo Vene, Tarmo Uustalu (eds.)
This instructional publication offers 9 conscientiously revised lectures given on the fifth foreign college on practical Programming, AFP 2004, in Tartu, Estonia in August 2004.
The ebook offers the next 9, rigorously cross-reviewed chapters, written via top gurus within the box: Typing Haskell with an characteristic Grammar, Programming with Arrows, Epigram: functional Programming with established kinds, Combining Datatypes and results, GEC: a toolkit for general speedy Prototyping, A sensible Shell that Operates on Typed and Compiled purposes, Declarative Debugging with Buddha, Server-Side net Programming in WASH, and Refactoring practical Programs.
Read Online or Download Advanced Functional Programming: 5th International School, AFP 2004, Tartu, Estonia, August 14 – 21, 2004, Revised Lectures PDF
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Extra info for Advanced Functional Programming: 5th International School, AFP 2004, Tartu, Estonia, August 14 – 21, 2004, Revised Lectures
In this context ‘local’ means that the scope is limited to the variant of a node. Attribute fTy deﬁned for variant IConst is available only for other attribute rules for variant IConst of Expr. Note that no explicit rule for synthesized attribute ty is required; a copy rule is inserted to use the value of the locally declared attribute ty. This is a common AG idiom when a value is required for later use as well or needs to be redeﬁned in later versions of EH. Some additional constants representing built-in types are also required: tyInt = Ty Con hsnInt tyChar = Ty Con hsnChar The local attribute fTy (by convention) holds the type as computed on the basis of the abstract syntax tree.
The constraints from the ﬁrst ﬁt ﬀo are applied immediately to the following component before ﬁtting that one. This is to prevent a → a Int → Char from ﬁnding two conﬂicting constraints [a → Int, a → Char ] instead of properly reporting an error. 3 Reconstructing Types for Expr Constraints are used to make knowledge found about previously unknown types explicit. The typing rules in Fig. 6 (and Fig. 7, Fig. 9) in principle do not need to be changed. The only reason to adapt some of the rules to the variant in Fig.
The ﬂow of values, that is, the copying between memory locations, through the execution of a program may only be such that a copy is allowed only if the corresponding types relate to each other in some proper fashion. A compiler uses a type system to analyse this ﬂow and to make sure that built-in functions are only applied to patterns that they are intended to work on. The idea is that if a compiler cannot ﬁnd an erroneous ﬂow of values, with the notion of erroneous deﬁned by the type system, the program is guaranteed not to crash because of unintended use of bitpatterns.