Le 2008-03-04 à 0:49, Allan Odgaard a écrit :
On 3 Mar 2008, at 13:30, Michel Fortin wrote:
[...]
1. A regexp that makes the parser enter the context the rule
represents (e.g. block quote, list, raw, etc.).
2. A list of which rules are allowed in the context of this rule.
3. A regexp for leaving the context of this rule.
4. A regexp which is pushed onto a stack when entering the context
of
this rule, and popped again when leaving this rule.
The fourth item here is really the interesting part, because it is
what made Markdown nesting work (99% of the time) despite this being
100% rule-driven.
I'm not sure that the regular expression in 4 does, beside being
pushed and popped from the stack
Yeah, I accidentally sent the letter w/o noticing I forgot to
explain the fourth rule.
[big explanation]
So you're basically using a line by line approach. I was thinking
about that as a possibility for parsing blocks, but I don't think I'll
do that because I need backtracking to be able to rewind beyond the
current line. Or can you do it?
I'm particularly curious about how you can handle headers of this form:
Header
======
Now take the rule for block quote:
BQ[1] = /\g {,3}> {,3}/ # We start it for lines with > allowing
# up to 3 spaces before/after.
BQ[2] = [ BQ, RAW, PAR, … ] # Basically all block elements
# can go inside block quote.
BQ[3] = /\g( *$|«hr»)/ # We leave block quote at empty lines or
# horizontal rulers¹. The actual
pattern for
# «hr» is something like:
# [ ]{,3}(?<M>[-*_])([ ]{,2}\k<M>)
{2,}[ \t]*+$
BQ[4] = /\g( {,3}> ?)?/ # While in BQ eat leading quote
characters.
¹ I am actually not sure if this is “the spec” or just a bug. But
placing a horizontal ruler just below a block quoted paragraph does
not give the expected “lazy mode” and places the <hr> inside the
block quote, instead it leaves the block quote.
I'm not sure what's the problem with horizontal rules in blockquotes.
I've tried many variations of:
> test
>
> ***
>
> test
and couldn't make it end the blockquote prematurely. If it did, I'd
say it'd be a bug because I see no way the user would expect the
horizontal rule to break the blockquote and no reason for the parser
to do so either.
[...]
Okay, enough writing — I hope the above gives a better understanding
of how the rules are used.
Indeed, it was quite insightful. Thank you.
Michel Fortin
[EMAIL PROTECTED]
http://michelf.com/
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