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To see how this works, let’s look at an ambiguity that’s common to most programming languages: the ambiguity between keywords and identifier rules. Keyword begin (followed by a nonletter) is also an identifier, at least lexically, so the lexer can match b-e-g-i-n to either rule. BEGIN : 'begin' ; ID : [a-z]+ ; // match b-e-g-i-n sequence; ambiguity resolves to BEGIN // match one or more of any lowercase letter For more on this lexical ambiguity, see Matching Identifiers, on page 74. Note that lexers try to match the longest string possible for each token, meaning that input beginner would match only to rule ID.

It’s needed when we split a large grammar into multiple smaller grammars so that ANTLR can synchronize all the token type numbers. See Importing Grammars, on page 36. java By default, ANTLR parsers build a tree from the input. By walking that tree, a tree walker can fire “events” (callbacks) to a listener object that we provide. ArrayInitListener is the interface that describes the callbacks we can implement. ArrayInitBaseListener is a set of empty default implementations. This class makes it easy for us to override just the callbacks we’re interested in.

After the walker visits all children of the assign node, it triggers exitAssign(). The tree diagram shown below shows ParseTreeWalker performing a depth-first walk, represented by the thick dashed line. StatContext enterAssign() sp TerminalNode AssignContext exitAssign() ExprContext = ; TerminalNode TerminalNode 100 TerminalNode It also identifies where in the walk ParseTreeWalker calls the enter and exit methods for rule assign. ) And the diagram in Figure 1, ParseTreeWalker call sequence, on page 19 shows the complete sequence of calls made to the listener by ParseTreeWalker for our statement tree.

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