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netsurf: create alias NodeExternal

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This commit is contained in:
Pierre Tachoire
2023-12-05 14:49:12 +01:00
parent f53e7bb601
commit 512641aa35
1 changed files with 23 additions and 26 deletions
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49
src/netsurf.zig
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@@ -39,9 +39,9 @@ const c = @cImport({
// - node: the node interface instance
inline fn getVtable(comptime VtableT: type, comptime NodeT: type, node: anytype) VtableT {
// first align correctly the node interface
const node_aligned: *align(@alignOf([*c]c.dom_node)) NodeT = @alignCast(node);
const node_aligned: *align(@alignOf(NodeExternal)) NodeT = @alignCast(node);
// then convert the node interface to a base node
const node_base = @as([*c]c.dom_node, @ptrCast(node_aligned));
const node_base = @as(NodeExternal, @ptrCast(node_aligned));
// retrieve the vtable on the base node
const vtable = node_base.*.vtable.?;
@@ -347,24 +347,22 @@ pub fn namedNodeMapGetLength(nnm: *NamedNodeMap) !u32 {
}
pub fn namedNodeMapItem(nnm: *NamedNodeMap, index: u32) !?*Attribute {
var n: [*c]c.dom_node = undefined;
var n: NodeExternal = undefined;
const err = c._dom_namednodemap_item(nnm, index, &n);
try DOMErr(err);
if (n == null) return null;
// cast [*c]c.dom_node into *Attribute
return @as(*Attribute, @ptrCast(n));
}
pub fn namedNodeMapGetNamedItem(nnm: *NamedNodeMap, qname: []const u8) !?*Attribute {
var n: [*c]c.dom_node = undefined;
var n: NodeExternal = undefined;
const err = c._dom_namednodemap_get_named_item(nnm, try strFromData(qname), &n);
try DOMErr(err);
if (n == null) return null;
// cast [*c]c.dom_node into *Attribute
return @as(*Attribute, @ptrCast(n));
}
@@ -373,7 +371,7 @@ pub fn namedNodeMapGetNamedItemNS(
namespace: []const u8,
localname: []const u8,
) !?*Attribute {
var n: [*c]c.dom_node = undefined;
var n: NodeExternal = undefined;
const err = c._dom_namednodemap_get_named_item_ns(
nnm,
try strFromData(namespace),
@@ -384,52 +382,42 @@ pub fn namedNodeMapGetNamedItemNS(
if (n == null) return null;
// cast [*c]c.dom_node into *Attribute
return @as(*Attribute, @ptrCast(n));
}
// Convert a parser pointer to a public dom_node pointer.
fn toDOMNode(comptime T: type, v: *T) [*c]c.dom_node {
const v_aligned: *align(@alignOf([*c]c.dom_node)) T = @alignCast(v);
return @ptrCast(v_aligned);
}
pub fn namedNodeMapSetNamedItem(nnm: *NamedNodeMap, attr: *Attribute) !?*Attribute {
var n: [*c]c.dom_node = undefined;
var n: NodeExternal = undefined;
const err = c._dom_namednodemap_set_named_item(
nnm,
toDOMNode(Attribute, attr),
toNodeExternal(Attribute, attr),
&n,
);
try DOMErr(err);
if (n == null) return null;
// cast [*c]c.dom_node into *Attribute
return @as(*Attribute, @ptrCast(n));
}
pub fn namedNodeMapSetNamedItemNS(nnm: *NamedNodeMap, attr: *Attribute) !?*Attribute {
var n: [*c]c.dom_node = undefined;
var n: NodeExternal = undefined;
const err = c._dom_namednodemap_set_named_item_ns(
nnm,
toDOMNode(Attribute, attr),
toNodeExternal(Attribute, attr),
&n,
);
try DOMErr(err);
if (n == null) return null;
// cast [*c]c.dom_node into *Attribute
return @as(*Attribute, @ptrCast(n));
}
pub fn namedNodeMapRemoveNamedItem(nnm: *NamedNodeMap, qname: []const u8) !*Attribute {
var n: [*c]c.dom_node = undefined;
var n: NodeExternal = undefined;
const err = c._dom_namednodemap_remove_named_item(nnm, try strFromData(qname), &n);
try DOMErr(err);
// cast [*c]c.dom_node into *Attribute
return @as(*Attribute, @ptrCast(n));
}
@@ -438,7 +426,7 @@ pub fn namedNodeMapRemoveNamedItemNS(
namespace: []const u8,
localname: []const u8,
) !*Attribute {
var n: [*c]c.dom_node = undefined;
var n: NodeExternal = undefined;
const err = c._dom_namednodemap_remove_named_item_ns(
nnm,
try strFromData(namespace),
@@ -447,7 +435,6 @@ pub fn namedNodeMapRemoveNamedItemNS(
);
try DOMErr(err);
// cast [*c]c.dom_node into *Attribute
return @as(*Attribute, @ptrCast(n));
}
@@ -479,16 +466,26 @@ pub fn nodeListLength(nodeList: *NodeList) !u32 {
}
pub fn nodeListItem(nodeList: *NodeList, index: u32) !?*Node {
var n: [*c]c.dom_node = undefined;
var n: NodeExternal = undefined;
const err = c._dom_nodelist_item(nodeList, index, &n);
try DOMErr(err);
if (n == null) return null;
// cast [*c]c.dom_node into *Node
return @as(*Node, @ptrCast(n));
}
// NodeExternal is the libdom public representation of a Node.
// Since we use the internal representation (dom_node_internal), we declare
// here a private version useful for some netsurf function call.
const NodeExternal = [*c]c.dom_node;
// Convert a parser pointer to a NodeExternal pointer.
fn toNodeExternal(comptime T: type, v: *T) NodeExternal {
const v_aligned: *align(@alignOf(NodeExternal)) T = @alignCast(v);
return @ptrCast(v_aligned);
}
// Node
pub const Node = c.dom_node_internal;