Tokens: either or actual string allowed.

(Later you may want to change that to a mutable map from strings to some additional information. The following JavaCC options may be useful for debugging your work. Suppose a symbol table is a stack of things called frames. I haven't bothered about adding the function name to the symbol table. Token examples include keywords, punctuation, literals such as numbers, and strings. I'll assume a simple scenario, which is that you only need to record information about variables, that there is no type information, and that things must be declared before use. (Indeed in Java you need to wait until all files are parsed, as identifiers might be declared in another file.) Java) allow identifiers to be declared after they are used and in that case it is best not to try to detect errors such as use of an undeclared variable until after the program is parsed. C and Pascal are languages where identifiers must be declared before they are used (with a few exceptions). Using a symbol table you can detect the use of variables that are not in scope during parsing for many languages but not all. variable or function name) and what their types are. Generally the symbol table also contains other information about the identifiers, such as what they represent (e.g. JavaCC - a parser generator for building parsers from grammars. Compile the code with the following command: Copy code snippet. This should mean you have many Java source files in the hello directory. java -jar javacc-full.jar HelloWorld.javacc. The job of a symbol table is to keep track of which identifiers can be used at each point in the program. You can generate the parser source for the Hello, World language with the following shell command: Copy code snippet. If (Options.getTokenManagerUsesParser() & !Options.Yes there is a better way to do this. PrintTokenSetup((Token) token_mgr_decls.get(0)) įor (j = 0 j < token_mgr_decls.size() j++) ')

Token t = (Token) token_mgr_decls.get(0) įinal boolean commonTokenActionNeeded = Options.getCommonTokenAction() are not proper JavaCC syntax, but your example is not either so I can only guess.

GenCodeLine('/* ' + getIdString(tn, tokMgrClassName + getFileExtension(Options.getOutputLanguage())) + ' */') I need to make JavaCC aware of a context (current parent token), and depending on that context, expect different token(s).

TODO :: CBA - Require Unification of output language specific processing Final List tn = new ArrayList(toolNames) maintains a stack of of input tokens and grammar symbols uses a finite-state automaton to determine.

Javacc token examples