ucg 0.8.0

A configuration generation grammar.
Documentation 
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let xml = import "std/xml.ucg";
let list = import "std/lists.ucg";

let t = import "std/testing.ucg";

let simple_name = "simple";
let simple_tag = xml.tag{name=simple_name};

assert t.equal{
    left = simple_tag.name,
    right = simple_name,
};

assert t.equal{
    left = simple_tag.attrs,
    right = {},
};

assert t.equal{
    left = simple_tag.children,
    right = [],
};

assert t.ok{
    test = not ("ns" in simple_tag),
    desc = "@ has no ns field" % (simple_tag),
};

let myns = xml.ns("myns", NULL);
let simple_tag_ns = xml.tag{name=simple_name, ns=myns};

assert t.ok{
    test = xml.validate_ns(myns),
    desc = "@ is a valid namespace" % (myns),
};

assert t.equal{
    left = simple_tag_ns.ns,
    right = myns,
};

let cplxns = xml.ns(myns, "http://example.com/");
let cplx_tag_ns = xml.tag{name=simple_name, ns=cplxns};

assert t.ok{
    test = xml.validate_ns(cplxns),
    desc = "@ is a valid namespace" % (cplxns),
};

assert t.equal{
    left = cplx_tag_ns.ns,
    right = cplxns,
};

let invalidns = {prefix="foons", url=""};

assert t.not_ok{
    test = xml.validate_ns(invalidns),
    desc = "@ is not a valid namespace" % (invalidns),
};

assert t.ok{
    test = xml.validate_node("simple text"),
    desc = "@ is a valid node" % ("simple text"),
};

assert t.ok{
    test = xml.is_tag({name="simple"}),
    desc = "@ is a valid tag" % ({name="simple"}),
};

assert t.ok{
    test = xml.validate_node({name="simple"}),
    desc = "@ is a valid node" % ({name="simple"}),
};

assert t.ok{
    test = xml.validate_node(simple_tag),
    desc = "@ is a valid tag" % (simple_tag),
};

assert t.ok{
    test = xml.validate_node(cplx_tag_ns),
    desc = "@ is a valid tag" % (cplx_tag_ns),
};

let doc = xml.doc(cplx_tag_ns);

assert t.equal{
    left = doc.root,
    right = cplx_tag_ns,
};

let cplx_tag_children = xml.tag{name=simple_name, children=[simple_tag]};

assert t.equal{
    left = cplx_tag_children.children.0,
    right = simple_tag,
};

assert t.equal{
    left = list.ops{list=cplx_tag_children.children}.len,
    right = 1,
};

let cplx_tag_attrs = xml.tag{name=simple_name, attrs={id="myid"}};

assert t.equal{
    left = cplx_tag_attrs.attrs.id,
    right = "myid",
};