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Language Implementation Patterns: Create Your Own by Terence Parr

By Terence Parr

Knowing how you can create domain-specific languages (DSLs) may give you a major productiveness develop. rather than writing code in a general-purpose programming language, you could first construct a customized language adapted to make you effective in a selected domain.

the secret is knowing the typical styles came upon throughout language implementations. Language layout Patterns identifies and condenses the most typical layout styles, offering pattern implementations of each.

The trend implementations use Java, however the styles themselves are thoroughly common. a number of the implementations use the well known ANTLR parser generator, so readers will locate this e-book a good resource of ANTLR examples to boot. yet this booklet will profit someone attracted to enforcing languages, despite their device of selection. different language implementation books specialise in compilers, that you infrequently desire on your everyday life. in its place, Language layout styles indicates you styles you should use for all types of language applications.

You'll discover ways to create configuration dossier readers, information readers, model-driven code turbines, source-to-source translators, resource analyzers, and interpreters. each one bankruptcy teams similar layout styles and, in every one development, you'll get hands-on event by means of construction an entire pattern implementation. by the point you end the publication, you'll know the way to unravel commonest language implementation problems.

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Additional info for Language Implementation Patterns: Create Your Own Domain-Specific and General Programming Languages (Pragmatic Programmers)

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Having an AST lets us sniff the input multiple times without having to reparse it, which would be pretty inefficient. For example, Pattern 25, Tree-Based Interpreter, on page 243 revisits AST nodes all the time as it executes while loops, and so on. 35 C HOOSING P ATTERNS AND A SSEMBLING A PPLICATIONS The AST also gives us a convenient place to store information that we compute in the various stages of the application pipeline. For example, it’s a good idea to annotate the AST with pointers into the symbol table.

A backtracking parser attempts alternatives in order until one of them matches the current input. In effect, this supports arbitrarily deep lookahead as opposed to the fixed lookahead of Pattern 4, LL(k) Recursive-Descent Parser, on page 59. This pattern is extremely powerful but can be very expensive at run-time. • Pattern 6, Memoizing Parser, on page 78. This pattern dramatically increases speculative parsing performance at the cost of a small amount of memory. • Pattern 7, Predicated Parser, on page 84.

This pattern adds a speculative parsing facility to recursive-descent parsers. It’s useful to have because sometimes it’s hard to distinguish between alternatives without simply trying them. A backtracking parser attempts alternatives in order until one of them matches the current input. In effect, this supports arbitrarily deep lookahead as opposed to the fixed lookahead of Pattern 4, LL(k) Recursive-Descent Parser, on page 59. This pattern is extremely powerful but can be very expensive at run-time.

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