By Terence Parr
Knowing the way to create domain-specific languages (DSLs) may give you an important productiveness enhance. rather than writing code in a general-purpose programming language, you could first construct a customized language adapted to make you effective in a specific domain.
the secret is realizing the typical styles chanced on throughout language implementations. Language layout Patterns identifies and condenses the commonest layout styles, supplying pattern implementations of each.
The trend implementations use Java, however the styles themselves are thoroughly normal. a few of the implementations use the well known ANTLR parser generator, so readers will locate this booklet a good resource of ANTLR examples to boot. yet this publication will profit someone attracted to enforcing languages, despite their software of selection. different language implementation books specialize in compilers, that you not often want on your way of life. as a substitute, Language layout styles indicates you styles you should use for every kind of language applications.
You'll learn how to create configuration dossier readers, information readers, model-driven code turbines, source-to-source translators, resource analyzers, and interpreters. every one bankruptcy teams comparable layout styles and, in each one development, you'll get hands-on event by way of construction an entire pattern implementation. by the point you end the e-book, you'll understand how to unravel most typical language implementation problems.
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Additional info for Language Implementation Patterns: Create Your Own Domain-Specific and General Programming Languages (Pragmatic Programmers)
Java:6) $ Related Patterns This pattern builds on Pattern 3, LL(1) Recursive-Descent Parser, on page 54 and uses Pattern 2, LL(1) Recursive-Descent Lexer, on page 49 to feed it tokens. Pattern 5, Backtracking Parser, on page 71 extends this pattern with arbitrary lookahead. Up Next At this point, we’ve got the most important parsing patterns down. To handle really tough language problems, we’ll need to dress up the recursive-descent parser even further. The next chapter defines patterns for arbitrary lookahead and using semantic information to guide the parse.
The only problem is describing the structure of our language to the computer. Since most languages have an infinite number of sentences, we can’t just delineate them. For the same reason, we can’t 41 P ARSER C ONSTRUCTION U SING A G RAMMAR DSL delineate all possible parse trees. What we need is a DSL for specifying languages. 3 Parser Construction Using a Grammar DSL Building recursive-descent parsers in a general-purpose programming language is tedious and error-prone. We have to type the same code templates over and over again.
Pattern 4, LL(k) Recursive-Descent Parser, on page 59 uses multisymbol lookahead, which is more powerful but has more complicated infrastructure. To implement an LL(1) recursive-descent parser, we can start by filling in the lookahead expressions from the parsing decisions shown in Pattern 1, Mapping Grammars to Recursive-Descent Recognizers, on page 45. To make parsing decisions, the parser tests the current lookahead token against the alternatives’ lookahead sets. A lookahead set is the set of tokens that can begin a particular alternative.