An SDL (Simple Declarative Language) library for D.
SDL is a data language like JSON, XML or YAML, except it's:
- Less verbose than JSON and XML.
- Type-aware.
- Easier to learn and read than YAML.
This is what SDL looks like (some of these examples, and more, are from the SDL site):
first "Joe"
last "Coder"
numbers 12 53 2 635
names "Sally" "Frank N. Stein"
pets chihuahua="small" dalmation="hyper" mastiff="big"
mixed 34.7f "Tim" somedate=2010/08/14
folder "myFiles" color="yellow" protection=on {
folder "my images" {
file "myHouse.jpg" color=true date=2005/11/05
file "myCar.jpg" color=false date=2002/01/05
}
folder "my documents" {
document "resume.pdf"
}
}
Tags are of this form:
[tag name] [values] [attributes] [children]
Tag and attribute names can optionally include a namespace prefix (ie, namespace:name). All parts are optional, the only exception being that an anonymous (ie, no name) tag must have at least one value.
Also:
- Tags are separated by either newline or semicolon.
- Whitespace and indentation is not significant (other than newlines).
- The line-continuation operator is
\(backslash). This can be used to split a tag across multiple lines. - Line comments start with either
#,//or--. - Block comments start with
/*and end with*/. - All the data types and syntax details are described here.
- API is completely redesigned for D.
- License is zlib/libpng, not LGPL. (No source from the Java or Ruby implementations was used or looked at.)
- Anonymous tags are named
""(empty string) not"content". - Dates with unknown or invalid time zones use a special type indicating "unknown time zone" (
DateTimeFracUnknownZone) instead of assuming GMT.