Filtri

Filtri is a tiny DSL for text substitution.

$ gem install filtri

Define a set of substitution rules using rule and apply to an input string:

f = filtri do
  rule /fo+/ => "bar"
  rule "baz" => "bug"
end

f.apply("foobazbarfoo")
=> "barbugbarbar"

Rules can also be read from a file:

File foo.rules:

 # this is a comment
 rule /fo+bar/ => "bazbag"
 rule /(a)+/ => '!!\1!!'
 rule /(b)+/ => '**\1**'

Load with Filtri::load:

Filtri.load("foo.rules").apply("foobarfoobar")
=> "**b**!!a!!z**b**!!a!!g**b**!!a!!z**b**!!a!!g"

A command line tool is included in this gem, filtri

Usage: filtri [options] [input]

Options:
    -r, --rule STRING                Single rule
    -f, --file RULE_FILE             File containing rules
    -v, --version                    Version information
    -h, --help                       Help

An example applying rules from the files f1.rule and f2.rule to the input files input1 and input2

File f1.rules:

rule /(foo+)/ => 'THIS WAS \1'
rule /(ba+r)/ => 'THIS WAS \1'

File f1.rules:

rule /(ba+z)/ => 'THIS WAS \1'
rule /bag/ => 'THIS WAS BAG'

File input1:

foooo
baaaaaaaaaaaaaaaaz
bag

File input2:

and baaaaaaaaaaar

Running filtri as

$ filtri -f f1.rules -f f2.rules input1 input2 > result.txt

..gives result.txt:

THIS WAS foooo
THIS WAS baaaaaaaaaaaaaaaaz
THIS WAS BAG
and THIS WAS baaaaaaaaaaar

Single rules can be provided using the option -r:

$ echo "foo" | filtri -r '"foo" => "bar"'
bar

Definitions for syntax highlighting of .rule files in Sublime Text 2 and TextMate is available (resource/filtri_rules.tmLanguage)

• 0.1.2 - Bugfixes
• 0.1.0 - Added filtri tool and syntax highlighting
• 0.0.1 - Initial version

Copyright (c) 2013 Karl L karl@ninjacontrol.com

MIT License

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Karl L, karl@ninjacontrol.com