Regular expressions are treated with their ordinary Java/Clojure, greedy
semantics.
Your regular expression for ITEM doesn't exclude whitespace or }
characters, so ITEM is matching "Harden }" which leaves no characters left
to match your grammar's right curly brace requirement.
=> (re-seq #"[^\"]+" "Harden }")
("Harden }")
A solution would be to make the regex for ITEM more restrictive.
On Sun, Jun 12, 2016 at 12:52 PM, Hussein B. <hubaghd...@gmail.com> wrote:
> Hello,
>
> I'm playing around Instaparse library, starting very simple.
>
> For input like :
>
> { player }
>
> I created the following parser:
>
> (def ast
> (ist/parser
> "TEST = OBJECT
> <WHITESPACE> = <#'\\s+'>
> <CURLY_OPEN> = <'{'>
> <CURLY_CLOSE> = <'}'>
> ITEM = #'[^\"]+'
> OBJECT = CURLY_OPEN WHITESPACE* ITEM WHITESPACE* CURLY_CLOSE"))
>
>
> In the REPL:
>
> user=> (ast "{ Harden } ")
>
> Parse error at line 1, column 12:
>
> { Harden }
>
> ^
>
> Expected one of:
>
> "}" (followed by end-of-string)
>
> #"\s+"
>
>
> Any ideas what I'm doing wrong?
>
> Thanks for help.
>
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