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Add README.E4X, a quick intro to E4X syntax, to the src directory.

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Kris Maglione
2008-10-04 07:33:53 +00:00
parent 27328ca295
commit ea1db5762f
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A terse introduction to E4X
Public Domain
The inline XML literals in this code are part of E4X, a standard
XML processing interface for ECMAScript. In addition to syntax
for XML literals, E4X provides a new kind of native object,
"xml", and a syntax, similar to XPath, for accessing and
modifying the tree. Here is a brief synopsis of the kind of
usage you'll see herein:
> let xml =
<foo bar="baz" baz="qux">
<bar>
<baz id="1"/>
</bar>
<baz id="2"/>
</foo>;
// Select all bar elements of the root foo element
> xml.bar
<bar><baz id="1"/></bar>
// Select all baz elements anywhere beneath the root
> xml..baz
<baz id="1"/>
<baz id="2"/>
// Select all of the immediate children of the root
> xml.*
<bar><baz id="1"/></bar>
<baz id="2"/>
// Select the bar attribute of the root node
> xml.@bar
baz
// Select all id attributes in the tree
> xml..@id
1
2
// Select all attributes of the root node
> xml.@*
baz
quz
// Add a quux elemend beneath the first baz
> xml..baz[0] += <quux/>
<baz id="1"/>
<quux/>
> xml
<foo bar="baz" baz="qux">
<bar>
<baz id="1"/>
<quux/>
</bar>
<baz id="2"/>
</foo>
// and beneath the second
> xml.baz[1] = <quux id="1"/>
> xml
<foo bar="baz" baz="qux">
<bar>
<baz id="1"/>
<quux/>
</bar>
<baz id="2"/>
<quux id="1"/>
</foo>
// Replace bar's subtree with a foo element
> xml.bar.* = <foo id="1"/>
> xml
<foo bar="baz" baz="qux">
<bar>
<foo id="1"/>
</bar>
<baz id="2"/>
<quux id="1"/>
</foo>
// Add a bar below bar
> xml.bar.* += <bar id="1"/>
<foo id="1"/>
<bar id="1"/>
> xml
<foo bar="baz" baz="qux">
<bar>
<foo id="1"/>
<bar id="1"/>
</bar>
<baz id="2"/>
<quux id="1"/>
</foo>
// Adding a quux attribute to the root
> xml.@quux = "foo"
foo
> xml
<foo bar="baz" baz="qux" quux="foo">
<bar>
<foo id="1"/>
<bar id="1"/>
</bar>
<baz id="2"/>
<quux id="1"/>
</foo>
> xml.bar.@id = "0"
> xml..foo[0] = "Foo"
Foo
> xml..bar[1] = "Bar"
Bar
> xml
js> xml
<foo bar="baz" baz="qux" quux="foo" id="0">
<bar id="0">
<foo id="1">Foo</foo>
<bar id="1">Bar</bar>
</bar>
<baz id="2"/>
<quux id="1"/>
</foo>
// Selecting all bar elements where id="1"
> xml..bar.(@id == 1)
Bar
// Literals:
// XMLList literal. No root node.
> <>Foo<br/>Baz</>
Foo
<br/>
Baz
// Interpolation.
> let x = "<foo/>"
> <foo bar={x}>{x + "<?>"}</foo>
<foo/><?>
> <foo bar={x}>{x + "<?>"}</foo>.toXMLString()
<foo bar="&lt;foo/>">&lt;foo/&gt;&lt;?&gt;</foo>
> let x = <foo/>
> <foo bar={x}>{x}</foo>.toXMLString()
<foo bar="">
<foo/>
</foo>