Comments (5)
I don't think there's a good way to do that without parsing the entire document. The problem is that documents can be implicitly started. That means the string foo
is a valid yaml document:
irb(main):001:0> require 'psych'
=> true
irb(main):002:0> Psych.load 'foo'
=> "foo"
irb(main):003:0>
You would essentially have to parse the entire string to make sure it was YAML. Say the document?
method returned true. Would people using Psych parse the document a second time? If so, why not just parse the document once and rescue from an exception?
We wouldn't want to test IO objects because it may not be possible to rewind the IO (possibly a socket or something).
from psych.
Good points.
Technically I believe the YAML spec requires a document start with ---
. I was simply thinking of a method that checks the first non-comment/non-blank line for this marker. The method's documentation could explain it's limitations with implicit documents. In fact, the method could be called something like YAML.explicit_document?(string)
to help clarify that.
Anyhow, obviously not the most pressing feature. Just a convenience that I could have made use of a few times, so I thought I'd suggest it.
from psych.
Gotcha! :-)
Unfortunately, the 1.1 spec says that YAML documents are not required to start with ---
. Look at the second production here. The l-implicit-document
production does not require a ---
, where an explicit document does require it.
from psych.
You're using 1.1, not 1.2?
from psych.
libyaml only supports 1.1 at this point, so ya, psych is only working with the 1.1 spec. Once libyaml gets an upgrade, we will too.
from psych.
Related Issues (20)
- YAML string in exponential format cannot be loaded by YAML 1.2 parser
- Psych::BadAlias error with simple alias HOT 1
- Version 4.0.5 breaks Date deserialization HOT 1
- JSON is invalid
- Dates with five digit years throw exception HOT 1
- Prevent snakeYAML add backslash when dump multiple line string HOT 1
- YAML.dump(date) generates warnings with Rails 7.0.7+ HOT 1
- [DOC] Link fragment does not work
- YAML 1.2 compliance possibly breaking VCR HOT 3
- Add settings for alias limits, recursion, and duplicate keys HOT 8
- TypeError: allocator undefined for Nokogiri::HTML5::Document on YAML.unsafe_load_file HOT 3
- Psych 5.1.1 fails to load on JRuby 9.x HOT 10
- Singleton Classes Aren't round-trippable
- Issue between psych and mini_racer on platform x86_64-linux HOT 1
- Psych::DisallowedClass when loading fixtures HOT 3
- Strange `FrozenError` on `Psych.load` HOT 1
- Kernel.y interferes with code relying on method_missing HOT 3
- SSL issues preventing installation HOT 1
- yaml parsing is wrong when key's value has leading colon HOT 1
- Preserve quote style while changing a YAML file
Recommend Projects
-
React
A declarative, efficient, and flexible JavaScript library for building user interfaces.
-
Vue.js
🖖 Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.
-
Typescript
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
-
TensorFlow
An Open Source Machine Learning Framework for Everyone
-
Django
The Web framework for perfectionists with deadlines.
-
Laravel
A PHP framework for web artisans
-
D3
Bring data to life with SVG, Canvas and HTML. 📊📈🎉
-
Recommend Topics
-
javascript
JavaScript (JS) is a lightweight interpreted programming language with first-class functions.
-
web
Some thing interesting about web. New door for the world.
-
server
A server is a program made to process requests and deliver data to clients.
-
Machine learning
Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.
-
Visualization
Some thing interesting about visualization, use data art
-
Game
Some thing interesting about game, make everyone happy.
Recommend Org
-
Facebook
We are working to build community through open source technology. NB: members must have two-factor auth.
-
Microsoft
Open source projects and samples from Microsoft.
-
Google
Google ❤️ Open Source for everyone.
-
Alibaba
Alibaba Open Source for everyone
-
D3
Data-Driven Documents codes.
-
Tencent
China tencent open source team.
from psych.