2015-10-26 06:09:29 +08:00
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# Frequently-Asked Questions (FAQ)
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2015-10-26 05:04:14 +08:00
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## Getting Started
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2015-10-26 06:09:29 +08:00
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* [How to I install and run a simple grammar?](getting-started.md)
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* [Why does my parser test program hang?](getting-started.md)
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2015-10-26 05:04:14 +08:00
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## Installation
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* Why can't ANTLR (grun) find my lexer or parser?
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* Why can't I run the ANTLR tool?
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* Why doesn't my parser compile?
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## General
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* Why do we need ANTLR v4?
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* What is the difference between ANTLR 3 and 4?
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* Why is my expression parser slow?
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## Grammar syntax
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## Lexical analysis
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* How can I parse non-ASCII text and use characters in token rules?
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* How do I replace escape characters in string tokens?
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* Why are my keywords treated as identifiers?
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* Why are there no whitespace tokens in the token stream?
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## Parse Trees
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* How do I get the input text for a parse-tree subtree?
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* What if I need ASTs not parse trees for a compiler, for example?
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* When do I use listener/visitor vs XPath vs Tree pattern matching?
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## Translation
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* ASTs vs parse trees
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* Decoupling input walking from output generation
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## Actions and semantic predicates
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* How do I test if an optional rule was matched?
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## Error handling
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* How do I perform semantic checking with ANTLR?
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