Implement innerHTML getter for HTML documents

XML case is not yet implemented.

src/components/script/dom/htmlserializer.rs

@@ -0,0 +1,135 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+use dom::namespace;
+use dom::attr::Attr;
+use dom::node::NodeIterator;
+use dom::node::{DoctypeNodeTypeId, DocumentFragmentNodeTypeId, CommentNodeTypeId, DocumentNodeTypeId, ElementNodeTypeId, TextNodeTypeId, AbstractNode};
+
+pub fn serialize(iterator: &mut NodeIterator) -> ~str {
+    let mut html = ~"";
+    let mut open_elements: ~[~str] = ~[];
+
+    for node in *iterator {
+        while open_elements.len() > iterator.depth {
+            html.push_str(~"</" + open_elements.pop() + ">");
+        }
+        html.push_str(
+            match node.type_id() {
+                ElementNodeTypeId(..) => {
+                    serialize_elem(node, &mut open_elements)
+                }
+                CommentNodeTypeId => {
+                    serialize_comment(node)
+                }
+                TextNodeTypeId => {
+                    serialize_text(node)
+                }
+                DoctypeNodeTypeId => {
+                    serialize_doctype(node)
+                }
+                DocumentFragmentNodeTypeId => {
+                    ~""
+                }
+                DocumentNodeTypeId(_) => {
+                    fail!("It shouldn't be possible to serialize a document node")
+                }
+            }
+            );
+    }
+    while open_elements.len() > 0 {
+        html.push_str(~"</" + open_elements.pop() + ">");
+    }
+    html
+}
+
+fn serialize_comment(node: AbstractNode) -> ~str {
+    node.with_imm_characterdata(|comment| {
+        ~"<!--" + comment.data + "-->"
+    })
+}
+
+fn serialize_text(node: AbstractNode) -> ~str {
+    node.with_imm_characterdata(|text| {
+        match node.parent_node() {
+            Some(parent) if parent.is_element() => {
+                parent.with_imm_element(|elem| {
+                    match elem.tag_name.as_slice() {
+                        "style" | "script" | "xmp" | "iframe" |
+                        "noembed" | "noframes" | "plaintext" |
+                        "noscript" if elem.namespace == namespace::HTML => {
+                            text.data.clone()
+                        },
+                        _ => escape(text.data, false)
+                    }
+               })
+            },
+            _ => escape(text.data, false)
+        }
+    })
+}
+
+fn serialize_doctype(node: AbstractNode) -> ~str {
+    node.with_imm_doctype(|doctype| {
+        ~"<!DOCTYPE" + doctype.name + ">"
+    })
+}
+
+fn serialize_elem(node: AbstractNode, open_elements: &mut ~[~str]) -> ~str {
+    node.with_imm_element(|elem| {
+        let mut rv = ~"<" + elem.tag_name;
+        for attr in elem.attrs.iter() {
+            rv.push_str(serialize_attr(attr));
+        };
+        rv.push_str(">");
+        match elem.tag_name.as_slice() {
+            "pre" | "listing" | "textarea" if
+                elem.namespace == namespace::HTML => {
+                    match node.first_child() {
+                        Some(child) if child.is_text() => {
+                            child.with_imm_characterdata(|text| {
+                                if text.data[0] == 0x0A as u8 {
+                                    rv.push_str("\x0A");
+                                }
+                            })
+                        },
+                        _ => {}
+                    }
+            },
+            _ => {}
+        }
+        if !elem.is_void() {
+            open_elements.push(elem.tag_name.clone());
+        }
+        rv
+    })
+}
+
+fn serialize_attr(attr: &@mut Attr) -> ~str {
+    let attr_name = if attr.namespace == namespace::XML {
+        ~"xml:" + attr.local_name.clone()
+    } else if attr.namespace == namespace::XMLNS &&
+        attr.local_name.as_slice() == "xmlns" {
+        ~"xmlns"
+    } else if attr.namespace == namespace::XMLNS {
+        ~"xmlns:" + attr.local_name.clone()
+    } else if attr.namespace == namespace::XLink {
+        ~"xlink:" + attr.local_name.clone()
+    } else {
+        attr.name.clone()
+    };
+    ~" " + attr_name + "=\"" + escape(attr.value, true) + "\""
+}
+
+fn escape(string: &str, attr_mode: bool) -> ~str {
+    let replaced = string.replace("&", "&amp;").replace("\xA0", "&nbsp;");
+    match attr_mode {
+        true => {
+            replaced.replace("\"", "&quot;")
+        },
+        false => {
+            replaced.replace("<", "&lt;").replace(">", "&gt;")
+        }
+    }
+}