Should you use a parser generator?

Should you use a parser generator?

A parser generator is a good tool that you should make part of your toolbox. A parser generator takes a grammar as input and automatically generates source code that can parse streams of characters using the grammar. Each node of the parse tree expands into one production of the grammar. …

What grammar is used for parsing generators?

To do so technically would require a more sophisticated grammar, like a Chomsky Type 1 grammar, also termed a context-sensitive grammar. However, parser generators for context-free grammars often support the ability for user-written code to introduce limited amounts of context-sensitivity.

Which is parser generator?

A parser generator is an application which generates a parser. Sometimes also called a ‘compiler compiler’. The usual input is a formal specification of the grammar the parser has to recognize, plus code implementing the actions the parser has to take when recognizing the various parts of its input.

What kind of parser is YACC?

grammar parser
Yacc (yet another compiler compiler) is a grammar parser and parser generator. That is, it is a program that reads a grammar specification and generates code that is able to organize input tokens in a syntactic tree in accordance with the grammar.

How do you write a good parser?

Writing a parser

1. Write many functions and keep them small. In every function, do one thing and do it well.
2. Do not try to use regexps for parsing. They don’t work.
3. Don’t attempt to guess. When unsure how to parse something, throw an error and make sure the message contains the error location (line/column).

Is Antlr slow?

ANTLR can use two different prediction modes: SLL and LL*. They are also known as parsing strategies. This is very slow and it is only used to debug your parser.

Can a parser generator be used for context free grammar?

However, parser generators for context-free grammars often support the ability for user-written code to introduce limited amounts of context-sensitivity.

Is it better to use a parser generator or hand written code?

Hand-written code can be faster, but only if you know your stuff – this is why most widely used compilers use a hand-written recursive-descent parser. There’s one thing you have to be careful of with parser-generators: the can sometimes reject your grammars.

Which is faster a Lexer or a parser generator?

For lexers the opposite is true though: generally generated lexers use table lookups, making them faster than (most) hand-written ones. Education-wise, writing your own parser will teach you more than using a generator. You have to write more and more complicated code after all, plus you have to understand exactly how you parse a language.

Which is parser generator targets visibly pushdown languages?

Owl is a parser generator which targets the class of visibly pushdown languages. It is: Efficient — Owl can parse any syntactically valid grammar in linear time.