Agda-2.2.10: A dependently typed functional programming language and proof assistantSource codeContentsIndex
Agda.Syntax.Parser.Comments
Description

This module defines the lex action to lex nested comments. As is well-known this cannot be done by regular expressions (which, incidently, is probably the reason why C-comments don't nest).

When scanning nested comments we simply keep track of the nesting level, counting up for open comments and down for close comments.

Synopsis
keepComments :: LexPredicate
keepCommentsM :: Parser Bool
nestedComment :: LexAction Token
hole :: LexAction Token
skipBlock :: String -> String -> LookAhead ()
Documentation
keepComments :: LexPredicateSource
Should comment tokens be output?
keepCommentsM :: Parser BoolSource
Should comment tokens be output?
nestedComment :: LexAction TokenSource
Manually lexing a block comment. Assumes an open comment has been lexed. In the end the comment is discarded and lexToken is called to lex a real token.
hole :: LexAction TokenSource
Lex a hole ({! ... !}). Holes can be nested. Returns TokSymbol SymQuestionMark.
skipBlock :: String -> String -> LookAhead ()Source
Skip a block of text enclosed by the given open and close strings. Assumes the first open string has been consumed. Open-close pairs may be nested.
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