Class: ApacheCrunch::FormatTokenFactory

Inherits:
Object
  • Object
show all
Defined in:
lib/format_token.rb

Overview

Generates FormatToken instances.

This class does the work of figuring out which FormatToken subclass to make.

Class Method Summary collapse

Class Method Details

.from_abbrev(abbrev) ⇒ Object

Takes an Apache log format abbreviation and returns a corresponding FormatToken



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# File 'lib/format_token.rb', line 87

def self.from_abbrev(abbrev)
    token_def = TokenDictionary.fetch(abbrev)
    if token_def
        # We found it in the dictionary, so just return a Token based on it
        tok = PredefinedToken.new
        tok.populate!(token_def)
    elsif abbrev !~ /^%/
        tok = StringToken.new
        tok.populate!(abbrev)
    elsif abbrev == "%%"
        tok = StringToken.new
        tok.populate!("%")
    elsif abbrev =~ /^%\{([A-Za-z0-9-]+)\}i/
        # HTTP request header
        tok = ReqheaderToken.new
        tok.populate!($1)
    elsif abbrev =~ /^%\{(.*?):([^}]+)\}r/
        # Arbitrary regex
        tok = RegexToken.new
        tok.populate!($1, $2)
    else
        raise "Unable to parse format definition starting at '#{abbrev}'"
    end

    tok
end