By Steven John Metsker
This booklet is for Java builders who are looking to examine an easy set of recommendations for growing and parsing little languages.The publication covers the fundamentals of parsing, together with tokenization, tips to recogize mathematics, and the way to create your personal typical expression languages. Later chapters convey find out how to create a SQL-like question language, a Prolog-like common sense language, and a curve plotting language known as Sling.
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Additional info for Building Parsers with Java
This class shows, in a minimal example, where assemblers * plug in to a parser composite. pop()); } } The main() method creates a composite parser e for Minimath and plugs in assemblers to assemble a result for an arithmetic string. The code discards the minus signs because they serve their purpose in guiding the parser and need not appear on the stack. The method asks the parser for a complete match against a tokenized string and prints the top of the stack of the resulting assembly.
For example, the adjective rule declares that both "steaming" and "hot" are suitable adjectives. 8. Indicate precedence by using parentheses. For example, if you wanted to show the good grammar on one line, you could write good = ("hot" | "steaming")* "coffee"; 9. tokens. Chapter 11, "Extending the Parser Toolkit," describes how to add new types of terminals. 10. Parameterize subparsers if it makes your grammar a better design. (This is an optional element of grammar design. It works only if you will code your subparsers as methods of a class.
Chapter 10, "Matching Mechanics," describes in detail how matching works. To show the results of a Repetition object, the example prints the results of the underlying match() method. When the code constructs a new Repetition object, it passes in the parser to 35 36 repeat. Because a Repetition always repeats a single parser, the only constructor for this class requires its caller to supply the parser to repeat. The parser p creates a set (or Vector) of possible matches against the input. The output shows the outermost pair of brackets that the Vector object prints.