On Mon, Aug 25, 2014 at 12:50 PM, Thierry Goubier <thierry.goubier@gmail.com> wrote:

2014-08-25 11:12 GMT+02:00 Usman Bhatti <usman.bhatti@gmail.com>:

I understand that context is important when parsing a program for certain parsing related information.

In my case, I am using PetitParser more as a syntax highlighter on the lines of PPTextHighlighter and in that case you dont need much of contextual information. All you need is token positions. Can we envisage, for such usage, a simplistic but more robust parser?

If you're more into that, then a lexer may be enough and a very efficient one can be built with SmaCC.

What you're doing doesn't seems to require a parser: it is just matching

It was just a illustrative example to show the slowness of PParser due to the recent modifications. What I want to achieve is to be able to express keyword or lines matching (may be some day complete code blocks as well). We found that doing it with the parser is quite easy.

It would be worth trying SmaCC to compare its performance with PP-based solution but I am not knowledgable about SmaCC. Any pointers to where should I start from?

regards,

Usman

Keyword [^\n] *

isn't it?

Thierry

[|string allStyles text|
string := (PharoFilesOpener default changesFileOrNil contents copyFrom: 1 to: 60000).
text := string asText.
allStyles := {
'Announcement' -> TextColor green.

'Collections' -> TextColor blue.
'File' -> TextColor blue.
'Metacello' -> TextColor red.
'Monticello' -> TextColor magenta.
'Morphic' -> TextColor orange.

'Mooose' -> TextColor green.
'FAMIX' -> TextColor green.
'Roassal' -> TextColor green.
}.
allStyles do: [ :assoc | ((assoc key asParser, #newline asParser negate star) matchingRangesIn: string) do: [:aRange | text addAttribute: (assoc value) from: aRange first to: aRange last] ].

text] timeToRun ==> 15 sec

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