A Regular expression(Joni) parser plugin for Embulk

This is a regular expression parser plugin for Embulk. It use Joni regular expression library. The Joni is Java port of Oniguruma regexp library.

The Fluentd also use Joni/Oniguruma. This plugin aim compatibility with fluentd regexp parser plugin format.

• Plugin type: parser
• Guess supported: yes (trivial)

• type: Specify this parser as joni_regexp
• columns: Specify column name and type. See below (array, required)
• stop_on_invalid_record: Stop bulk load transaction if a file includes invalid record (such as invalid timestamp) (boolean, default: false)
• default_timezone: Default timezone of the timestamp (string, default: UTC)
• default_timestamp_format: Default timestamp format of the timestamp (string, default: %Y-%m-%d %H:%M:%S.%N %z)
• newline: Newline character (CRLF, LF or CR) (string, default: CRLF)
• charset: Character encoding (eg. ISO-8859-1, UTF-8) (string, default: UTF-8)
• format: Regular expression string Supported expression (string, required)

• name: Name of the column (string, required)
• type: Type of the column (string, required)
• timezone: Timezone of the timestamp if type is timestamp (string, default: default_timestamp)
• format: Format of the timestamp if type is timestamp (string, default: default_format)

in:
  type: any file input plugin type
  parser:
    type: joni_regexp
    columns:
      - { name: host, type: string }
      - { name: user, type: string }
      - { name: time, type: timestamp, format: "%d/%b/%Y:%H:%M:%S %z" }
      - { name: method, type: string }
      - { name: path, type: string }
      - { name: code, type: string }
      - { name: size, type: string }
      - { name: referer, type: string }
      - { name: agent, type: string }
    format: '^(?<host>[^ ]*) [^ ]* (?<user>[^ ]*) \[(?<time>[^\]]*)\] "(?<method>\S+)(?: +(?<path>[^ ]*) +\S*)?" (?<code>[^ ]*) (?<size>[^ ]*)(?: "(?<referer>[^\"]*)" "(?<agent>[^\"]*)")?$'

This plugin also support minimul guess command. The guess command require type and fomat parameters.

seed.yml example.

in:
  type: file
  path_prefix: example/test2.txt
  parser:
    type: joni_regexp
    format: "(?<name>[^,]+),(?<birth>\\d{4}-\\d{2}-\\d{2}),(?<age>\\d+)"
out:
  type: stdout

execute guess command.

$ embulk guess -g joni_regexp config.yml -o guessed.yml

The guess command read format parameter and generate columns.

in:
  type: file
  path_prefix: example/test2.txt
  parser:
    type: joni_regexp
    format: (?<name>[^,]+),(?<birth>\d{4}-\d{2}-\d{2}),(?<age>\d+)
    charset: UTF-8
    newline: LF
    columns:
    - {name: name, type: string}
    - {name: birth, type: string}
    - {name: age, type: string}
out: {type: stdout}

$ embulk gem install embulk-parser-joni

$ ./gradlew gem  # -t to watch change of files and rebuild continuously