Re: Incorporating comments in syntax tree?

solution@gate.net (Ken Walter)
1 Feb 1996 21:43:47 -0500

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From: solution@gate.net (Ken Walter)
Newsgroups: comp.compilers,comp.compilers.tools.pccts
Date: 1 Feb 1996 21:43:47 -0500
Organization: Solution Technology
References: 96-01-121
Keywords: parse, analysis

ag129@ucs.cam.ac.uk (A. Grant) writes:
> Does anyone know of any techniques for reading comments in compiler
> input and associating them with the syntax tree [...] .


I use all sorts of special code in the lex scanner. If a comment
starts a line then it and all other whole line comments following it
are attached to the next token. Otherwise it is attached to the
previous token.


This way comments become attributes and are not part of the syntax.


The semantic processing then moves the information around the parse
tree as needed and does what it needs to the comment.


Ken Walter
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