Import r6923 from upstream hg supporting Firefox up to 22.0a1

[dactyl.git] / README.E4X

diff --git a/README.E4X b/README.E4X
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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>
-