Parse yer YAMLs



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YAML is a flexible data serialization format that is designed to be easily read and written by human beings.

This library parses YAML documents into native Julia types. (Dumping Julia objects to YAML has not yet been implemented.)


For most purposes there is one important function: YAML.load, which takes a string and parses it the first YAML document it finds.

To parse a file use YAML.load_file, and to parse every document in a file use YAML.load_all or YAML.load_all_file.

Given a YAML document like the following

receipt:     Oz-Ware Purchase Invoice
date:        2012-08-06
    given:   Dorothy
    family:  Gale

    - part_no:   A4786
      descrip:   Water Bucket (Filled)
      price:     1.47
      quantity:  4

    - part_no:   E1628
      descrip:   High Heeled "Ruby" Slippers
      size:      8
      price:     100.27
      quantity:  1

bill-to:  &id001
    street: |
            123 Tornado Alley
            Suite 16
    city:   East Centerville
    state:  KS

ship-to:  *id001

specialDelivery:  >
    Follow the Yellow Brick
    Road to the Emerald City.
    Pay no attention to the
    man behind the curtain.

It can be loaded with

import YAML

data = YAML.load(open("test.yml"))


Which will show you something like this.

{"date"=>Aug 6, 2012 12:00:00 AM PDT,"ship-to"=>{"street"=>"123 Tornado Alley\nSuite 16\n","state"=>"KS","city"=>"East Centerville"},"customer"=>{"given"=>"Dorothy","family"=>"Gale"},"specialDelivery"=>"Follow the Yellow Brick\nRoad to the Emerald City.\nPay no attention to the\nman behind the curtain.\n","items"=>{{"price"=>1.47,"descrip"=>"Water Bucket (Filled)","part_no"=>"A4786","quantity"=>4}  …  {"price"=>100.27,"size"=>8,"descrip"=>"High Heeled julia-observer-html-cut-paste-0__workquot;Rubyjulia-observer-html-cut-paste-0__workquot; Slippers","part_no"=>"E1628","quantity"=>1}},"bill-to"=>{"street"=>"123 Tornado Alley\nSuite 16\n","state"=>"KS","city"=>"East Centerville"},"receipt"=>"Oz-Ware Purchase Invoice"}

Note that ints and floats are recognized, as well as timestamps which are parsed into CalendarTime objects. Also, anchors and references work as expected, without making a copy.

Not yet implemented

  • Emitting julia objects to YAML.
  • Parsing sexigesimal numbers.
  • Fractions of seconds in timestamps.
  • Specific time-zone offsets in timestamps.
  • Application specific tags.

First Commit


Last Touched

about 1 month ago


100 commits