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const std = @import("std");
const Allocator = std.mem.Allocator;
pub const HTML = @import("html/Element.zig");
pub const paragraph = @import("paragraph.zig");
pub const Title = @import("Title.zig");
pub const list = @import("list.zig");
pub const Image = @import("Image.zig");
pub const Root = @import("Root.zig");
const blocks = @import("blocks.zig");
pub const Code = blocks.Code;
pub const Figure = blocks.Figure;
pub const Callout = blocks.Callout;
pub const Quote = blocks.Quote;
pub const Math = @import("math.zig");
pub fn Wrapper(comptime V: type, comptime h: *const fn (*V, Allocator) HTML.Error!HTML) type {
comptime {
if (!@hasField(V, "node")) @compileError("missing field 'node' for " ++ @typeName(V));
const nd = @FieldType(V, "node");
if (nd != Node) @compileError("invalid node's type: " ++ @typeName(nd) ++ ", want " ++ @typeName(Node));
if (!std.meta.hasMethod(V, "element")) @compileError("missing declaration 'element' for " ++ @typeName(V));
}
return struct {
ptr: *V,
const Self = @This();
fn node(context: *anyopaque) *Node {
const self: *V = @ptrCast(@alignCast(context));
return &self.node;
}
fn html(context: *anyopaque, alloc: Allocator) HTML.Error!HTML {
const self: *V = @ptrCast(@alignCast(context));
return try h(self, alloc);
}
pub fn init(ptr: *V) Element {
return (Self{ .ptr = ptr }).element();
}
pub fn element(self: Self) Element {
return .{ .ptr = self.ptr, .vtable = .{ .node = Self.node, .html = Self.html } };
}
};
}
pub const Node = struct {
ptr: *anyopaque,
vtable: struct { element: *const fn (*anyopaque) Element },
node: std.DoublyLinkedList.Node = .{},
pub fn from(n: *std.DoublyLinkedList.Node) *Node {
const v: *Node = @fieldParentPtr("node", n);
return v;
}
pub fn element(self: Node) Element {
return self.vtable.element(self.ptr);
}
};
const Element = @This();
vtable: struct {
html: *const fn (*anyopaque, Allocator) HTML.Error!HTML,
node: *const fn (*anyopaque) *Node,
},
ptr: *anyopaque,
pub fn renderHTML(self: Element, alloc: Allocator) HTML.Error![]const u8 {
const root = try HTML.Root.init(alloc);
defer root.deinit();
var el = try self.vtable.html(self.ptr, root.allocator());
return el.render(alloc);
}
pub fn html(self: Element, alloc: Allocator) HTML.Error!HTML {
return self.vtable.html(self.ptr, alloc);
}
pub fn node(self: Element) *Node {
return self.vtable.node(self.ptr);
}
pub const Literal = struct {
content: []const u8,
node: Node = .{
.ptr = undefined,
.vtable = .{ .element = fromNode },
},
const Self = @This();
pub fn init(alloc: Allocator, content: []const u8) !*Self {
const v = try alloc.create(Self);
v.* = .{ .content = content };
v.node.ptr = v;
return v;
}
pub fn element(self: *Self) Element {
return Wrapper(Self, Self.html).init(self);
}
fn fromNode(context: *anyopaque) Element {
const self: *Self = @ptrCast(@alignCast(context));
return self.element();
}
fn html(self: *Self, alloc: Allocator) HTML.Error!HTML {
return (try HTML.Literal.init(alloc, self.content)).element();
}
};
pub fn Simple(comptime tag: []const u8) type {
return struct {
content: ?Element = null,
node: Node,
const Self = @This();
pub fn init(alloc: Allocator) !*Self {
const v = try alloc.create(Self);
v.node = .{ .ptr = v, .vtable = .{ .element = fromNode } };
return v;
}
pub fn element(self: *Self) Element {
return Wrapper(Self, Self.html).init(self);
}
pub fn toTag(self: *Self, alloc: Allocator, comptime target: []const u8) !*Simple(target) {
defer alloc.destroy(self);
const el = try Simple(target).init(alloc);
el.content = self.content;
return el;
}
pub fn toRoot(self: *Self, alloc: Allocator) !*Root {
defer alloc.destroy(self);
const el = try Root.init(alloc);
if (self.content) |it| el.append(it);
return el;
}
fn fromNode(context: *anyopaque) Element {
const self: *Self = @ptrCast(@alignCast(context));
return self.element();
}
fn html(self: *Self, alloc: Allocator) HTML.Error!HTML {
var el = try HTML.Content.init(alloc, tag);
if (self.content) |it| el.content = try it.html(alloc);
return el.element();
}
};
}
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