DOCUMENTATION. CONTACT. The Java Parser Generator. Java Compiler Compiler™ (JavaCC™) is the most popular parser generator for use with Java™ . By following the links from this page you should be able to obtain all necessary documentation on JavaCC. In addition to these links there is also some useful. This web page is a comprehensive list of all classes, methods, and variables available for use by a JavaCC [tm] user. These classes, methods, and variables are.

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Parsing functions can take in parameters, return results, and invoke blocks of arbitrary Java code.

See the description of the lookahead algorithm for complete details on how lookahead works. A regular expression production is used to define lexical entities that get processed by the generated token manager. When it docmuentation a parent for them, it pops the children from the stack and adds them to the parent, and finally pushes the new parent node itself.

A conditional node is constructed with all of the children that were pushed on the stack within its node scope if and only if its condition evaluates to true. White space in the grammar files also follows the same conventions as for the Java programming language.

JavaCC Documentation

This page was last edited on 23 Decemberat When the parser recognizes a P1 nonterminal it begins an indefinite node. Grammar files are preprocessed for Unicode escapes just as Java files are i. Doucmentation this is a list of grammar productions.


They have not yet been added to the node, so they aren’t available via the node’s methods. This option is used to obtain debugging information from the generated parser. Otherwise, it applies to all the lexical states in the identifier list within the angular brackets. All AST nodes must implement this interface. As will be seen later, non-terminals on the right hand sides of productions are written as method calls, so the passing of values up and down the tree are done using exactly the same paradigm as method call and return.

You can further customize the documentatlon tree: At least one lookahead constraint must be present. For example, public static Node MyNode. A concatenation of legal parses of the expansion units is a legal parse of the expansion.

There are four kinds of productions in JavaCC. Unlike yacc, however, JavaCC generates top-down parsers. If set the option names a Token factory class containing a public static Token newToken int ofKind, String image method.

JavaCC – Wikipedia

This option may be set to the name of a class that will be used as the base class for the generated Token class. If this option is set to true, then the token manager is generated to read characters from any character stream reader of type “CharStream. JJTree doesn’t specify how many times the expression will documentatoin evaluated.

See the minitutorial on the token manager for more details of special token handling. This is documentatikn expansion or expansion choices that is used for the purpose of determining whether or not the particular choice that this local lookahead specification applies to is to be taken.


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You can further customize the generated tree:. This controls where output files are generated.

In this example, an indefinite node P3 is begun, marking the stack, and then a P4 node, one or more P5 nodes and a P6 node are parsed. Node Scopes and User Actions Each node is associated with a node scope. When set to false, the parser file is not generated. A complex regular expression unit can be a parenthesized set of complex regular expression choices.

For the above example, the generated parser will look like:. A definite node descriptor expression can be any integer expression, although literal integer constants are by far the most common expressions.

The class SimpleNode implements the Node interface, and is automatically generated by JJTree if it doesn’t already exist. Then the exception is rethrown. Hence, documentaation Java compiler can detect errors in this code that has been processed by JavaCC. This option is used to obtain debugging information from the generated token manager. The name of the non-terminal is the name of the method, and the parameters and return value declared are the means to pass values up and down the parse tree.