On 16 Oct 2008, at 08:36, David Trasbo wrote:
>
> Okay, I think I should describe my tricky problem a little further.
> This
> is it: The method does a scan_until(/\{/) which means it stops when
> meeting a curly brace and starts looking for something matching \w+
> immediately after the curly brace. That is the partial to render.
>
> The string looks like this: {test_partial foo:"bar foo" bar:"foo bar"}
>
> Fine. Then it starts looking for arguments immediately after the
> partial
> and a space. My problem is that the method only supports values that
> matches \w+. I would like values to be able to match .* or .+.
>
Greedy things like .* are almost always dangerous as they make you
consume the entire string. typically you'd want to scan or scan_until
the first occurence of something
the following modification to the previous solution does that:
def dropify(content)
s = StringScanner.new(content)
output = ""
previous_end = 0
while s.scan_until(/\{/)
output << content[previous_end, s.pointer - previous_end - 1]
partial = s.scan(/\w+/)
s.skip /\s+/
arguments = {}
while label= s.scan(/(\w+):"/)
name=s[1]
value = s.scan /[^"]+/
arguments[name.to_sym] = value
s.skip /"\s+/
end
s.skip_until /\}/
previous_end = s.pointer
puts arguments.inspect
end
end
Having scanned \w+:" (ie a label and the opening quote mark) we
consume all non " characters and says those are the arguments. then we
skip over the closing " and any whitespace
dropify('{test_partial foo:"bar foo" bar:"foo bar"}')
outputs
{:foo=>"bar foo", :bar=>"foo bar"}
Fred
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