By Ronald Mak
Long-awaited revision to a special advisor that covers either compilers and interpreters Revised, up to date, and now targeting Java rather than C++, this long-awaited, most modern variation of this renowned ebook teaches programmers and software program engineering scholars how one can write compilers and interpreters utilizing Java. You?ll write compilers and interpreters as case stories, producing common meeting code for a Java digital desktop that takes benefit of the Java Collections Framework to shorten and simplify the code. moreover, insurance contains Java Collections Framework, UML modeling, object-oriented programming with layout styles, operating with XML intermediate code, and extra.
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Extra resources for Writing Compilers and Interpreters: A Software Engineering Approach
Public abstract int getErrorCount(); 53 /** * Call the scanner's currentToken() method. * @return the current token. currentToken(); } /** * Call the scanner's nextToken() method. * @return the next token. * @throws Exception if an error occurred. nextToken(); } } Because there will be only one symbol table in the front end, class Parser implements symTab as a class field. The 54 static block will initialize it once before any Parser objects are created. Source Listing 2-2 shows the key methods of the Source framework class.
A solid arrow with a hollow diamond at the owner’s end (such as from Parser to Scanner) indicates that one class “owns” or “aggregates” another using a reference that lasts the lifetime of an object. The name of the field that holds the reference labels the arrow (for example, the parser uses its scanner field to maintain a reference to its scanner). A solid arrow with a closed hollow arrowhead (such as from EofToken to Token) points from a subclass to its superclass. Below the class name, a class diagram can optionally include sections for the fields and for the methods.
The parser and the scanner are closely related. The parser “owns” a scanner by using its protected scanner field to keep a reference to the scanner. The parser requests tokens from its scanner, and so it has a dependency on tokens. The scanner owns the current token using its private currentToken field. It owns the source via the protected source field; it passes the source reference to each token it constructs. Each token then also owns that source via its protected source field. During its construction, a token reads characters from the source.