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tweak doc

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parrt 2016-03-30 16:06:11 -07:00
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doc/options.md
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@ -58,7 +58,8 @@ $ antlr4 T2.g4
$ grep MyToken T2Parser.java $ grep MyToken T2Parser.java
public MyToken x; public MyToken x;
``` ```
* `contextSuperClass`. Specify the super class of parse tree internal nodes. Default is `ParserRuleContext`. Should derived from ultimately `RuleContext` at minimum. * `contextSuperClass`. Specify the super class of parse tree internal nodes. Default is `ParserRuleContext`. Should derive from ultimately `RuleContext` at minimum.
Java target can use `contextSuperClass=org.antlr.v4.runtime.RuleContextWithAltNum` for convenience. It adds a backing field for `altNumber`, the alt matched for the associated rule node.
## Rule Options ## Rule Options