Class: ApacheCrunch::FormatParser

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

Overview

Parses a log format definition

Instance Method Summary collapse

Constructor Details

#initialize ⇒ FormatParser

Initializes the FormatParser

Takes a FormatElementFactory instance.



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# File 'lib/format.rb', line 24

def initialize
    @_FormatTokenFactory = FormatTokenFactory
end

Instance Method Details

#_shift_token(format_def) ⇒ Object

Finds the first token in a format definition

Returns a list containing the token and the new format definition (with the characters that correspond to the token removed)



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# File 'lib/format.rb', line 52

def _shift_token(format_def)
    if format_def =~ /^%%(.*)/
        # Literal "%"
        return [@_FormatTokenFactory.from_abbrev("%%"), $1]
    elsif format_def =~ /^(%[A-Za-z])(.*)/
        # Simple element (e.g. "%h", "%u")
        return [@_FormatTokenFactory.from_abbrev($1), $2]
    elsif format_def =~ /^%[<>]([A-Za-z])(.*)/
        # No idea how to handle mod_log_config's "which request" system yet, so we
        # ignore it.
        return [@_FormatTokenFactory.from_abbrev("%" + $1), $2]
    elsif format_def =~ /^(%\{.+?\}[Ceinor])(.*)/
        # "Contents of" element (e.g. "%{Accept}i")
        return [@_FormatTokenFactory.from_abbrev($1), $2]
    elsif format_def =~ /^(.+?)(%.*|$)/
        # Bare string up until the next %, or up until the end of the format definition
        return [@_FormatTokenFactory.from_abbrev($1), $2]
    end
end

#dep_inject!(format_token_factory_cls) ⇒ Object

Handles dependency injection



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# File 'lib/format.rb', line 29

def dep_inject!(format_token_factory_cls)
    @_FormatTokenFactory = format_token_factory_cls
end

#parse_def(format_def) ⇒ Object

Parses the given format_def (e.g. “%h %u %s #Refereri”) and returns a list of tokens.

These tokens are all instances of a LogFormatElement subclass.



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# File 'lib/format.rb', line 36

def parse_def(format_def)
    s = format_def
    tokens = []
    
    until s.empty?
        token, s = _shift_token(s)
        tokens << token
    end

    tokens
end