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Streamlined URI parsing [dm1]

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This commit is contained in:
Alexey Verkhovsky 2005-01-18 20:31:42 +00:00
parent 60c16e0be7
commit 07e43d2dae
1 changed files with 29 additions and 33 deletions
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62
app/models/chunks/uri.rb
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@ -26,53 +26,49 @@ class URIChunk < Chunk::Abstract
COUNTRY = '(?:au|at|be|ca|ch|de|dk|fr|hk|in|ir|it|jp|nl|no|pt|ru|se|sw|tv|tw|uk|us)'
# These are needed otherwise HOST will match almost anything
TLDS = "\\.(?:#{GENERIC}|#{COUNTRY})"
TLDS = "(?:#{GENERIC}|#{COUNTRY})"
# Redefine USERINFO so that it must have non-zero length
USERINFO = "(?:[#{UNRESERVED};:&=+$,]|#{ESCAPED})+"
# Pattern of legal URI endings to stop interference with some Textile
# markup. (Images: !URI!) and other punctuation eg, (http://wiki.com/)
URI_ENDING = '[)!]'
# unreserved_no_ending = alphanum | mark, but URI_ENDING [)!] excluded
UNRESERVED_NO_ENDING = "-_.~*'(#{ALNUM}"
# this ensures that query or fragment do not end with URI_ENDING
# and enable us to use a much simpler self.pattern Regexp
# uric_no_ending = reserved | unreserved_no_ending | escaped
URIC_NO_ENDING = "(?:[#{UNRESERVED_NO_ENDING}#{RESERVED}]|#{ESCAPED})"
# query = *uric
QUERY = "#{URIC_NO_ENDING}*"
# fragment = *uric
FRAGMENT = "#{URIC_NO_ENDING}*"
# DOMLABEL is defined in the ruby uri library, TLDS is defined above
FULL_HOSTNAME = "(?:#{DOMLABEL}\\.)+#{TLDS}"
# Correct a typo bug in ruby 1.8.x lib/uri/common.rb
PORT = '\\d*'
# The basic URI expression as a string
URI_PATTERN =
"(?:(#{SCHEME})://)?" + # Optional scheme:// (\1|\8)
"(?:(#{USERINFO})@)?" + # Optional userinfo@ (\2|\9)
"(#{HOSTNAME}#{TLDS})" + # Mandatory host eg, HOST.com.au (\3|\10)
"(?::(#{PORT}))?" + # Optional :port (\4|\11)
"(#{ABS_PATH})?" + # Optional absolute path (\5|\12)
"(?:\\?(#{QUERY}))?" + # Optional ?query (\6|\13)
"(?:\\#(#{FRAGMENT}))?" # Optional #fragment (\7|\14)
URI_PATTERN =
"(?:(#{SCHEME}):/{0,2})?" + # Optional scheme: (\1)
"(?:(#{USERINFO})@)?" + # Optional userinfo@ (\2)
"(#{FULL_HOSTNAME})" + # Mandatory hostname (\3)
"(?::(#{PORT}))?" + # Optional :port (\4)
"(#{ABS_PATH})?" + # Optional absolute path (\5)
"(?:\\?(#{QUERY}))?" + # Optional ?query (\6)
"(?:\\#(#{FRAGMENT}))?" # Optional #fragment (\7)
end
def self.pattern()
# This pattern first tries to match the URI_PATTERN that ends with
# punctuation that is a valid URI character (eg, ')', '!'). If
# such a match occurs, there should be no backtracking (hence the ?> ).
# If the string cannot match a URI ending with URI_ENDING, then a second
# attempt is tried.
Regexp.new("(?>#{URI_PATTERN}(?=#{URI_ENDING}))|#{URI_PATTERN}", Regexp::EXTENDED, 'N')
Regexp.new(URI_PATTERN, Regexp::EXTENDED, 'N')
end
attr_reader :uri, :scheme, :user, :host, :port, :path, :query, :fragment, :link_text
def initialize(match_data)
super(match_data)
# Since the URI_PATTERN is tried twice, there are two sets of
# groups, one from \1 to \7 and the second from \8 to \14.
# The fields are set by which ever group matches.
@scheme = match_data[1] || match_data[8]
@user = match_data[2] || match_data[9]
@host = match_data[3] || match_data[10]
@port = match_data[4] || match_data[11]
@path = match_data[5] || match_data[12]
@query = match_data[6] || match_data[13]
@fragment = match_data[7] || match_data[14]
@scheme, @user, @host, @port, @path, @query, @fragment = match_data[1..-1]
# If there is no scheme, add an appropriate one, otherwise
# set the URI to the matched text.
@ -95,7 +91,7 @@ class URIChunk < Chunk::Abstract
# If the text should be escaped then don't keep this chunk.
# Otherwise only keep this chunk if it was substituted back into the
# content.
def unmask(content)
def unmask(content)
return nil if escaped_text
return self if content.sub!( Regexp.new(mask(content)), "<a href=\"#{uri}\">#{link_text}</a>" )
end