Method: RSQL::EvalContext#grep

Defined in:
lib/rsql/eval_context.rb

#grep(pattern, *gopts) ⇒ Object (private)

Remove all rows that do NOT match the expression. Returns true if any matches were found.

Options:

:fixed   => indicates that the string should be escaped of any
            special characters
:nocolor => will not add color escape codes to indicate the
            match
:inverse => reverses the regular expression match



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# File 'lib/rsql/eval_context.rb', line 526

def grep(pattern, *gopts) # :doc:
    nocolor = gopts.include?(:nocolor)

    if inverted = gopts.include?(:inverse)
        # there's no point in coloring matches we are removing
        nocolor = true
    end

    if gopts.include?(:fixed)
        regexp = Regexp.new(/#{Regexp.escape(pattern.to_str)}/)
    elsif Regexp === pattern
        regexp = pattern
    else
        regexp = Regexp.new(/#{pattern.to_str}/)
    end

    rval = inverted

    @results.delete_if do |row|
        matched = false
        row.each do |val|
            val = val.to_s unless String === val
            if nocolor
                if matched = !val.match(regexp).nil?
                    rval = inverted ? false : true
                    break
                end
            else
                # in the color case, we want to colorize all hits in
                # all columns, so we can't early terminate our
                # search
                if val.gsub!(regexp){|m| "\e[31;1m#{m}\e[0m"}
                    matched = true
                    rval = inverted ? false : true
                end
            end
        end
        inverted ? matched : !matched
    end

    return rval
end