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Text.ParserCombinators.Poly.StateLazy |
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Synopsis |
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The Parser datatype.
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Parsers do not return explicit failure. An exception is raised
instead. This allows partial results to be returned before a
full parse is complete.
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The Parser datatype is a fairly generic parsing monad with error
reporting and a running state. It can be used for arbitrary token
types, not just String input.
| Constructors | P (s -> [t] -> (Either String a, s, [t])) | |
| Instances | |
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Apply a parser to an initial state and input token sequence.
The parser cannot return an error value explicitly, so errors
raise an exception. Thus, results can be partial (lazily constructed,
but containing undefined).
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Combinators:
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Primitives
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Yield one token.
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Yield one token if it satisfies a predicate.
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State-handling
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Update the internal state.
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Query the internal state.
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Deliver the entire internal state.
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Re-parsing
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Push some tokens back onto the front of the input stream and reparse.
This is useful e.g. for recursively expanding macros. When the
user-parser recognises a macro use, it can lookup the macro
expansion from the parse state, lex it, and then stuff the
lexed expansion back down into the parser.
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Re-export all more general combinators
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module Text.ParserCombinators.Poly.Base |
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Produced by Haddock version 0.8 |