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const std = @import("std");
const Allocator = std.mem.Allocator;
const DOMElement = @import("dom/Element.zig");
const Parent = @This();
vtable: struct {
deinit: *const fn (*anyopaque, Allocator) void,
dom: *const fn (*anyopaque, Allocator) DOMElement.Error!DOMElement,
},
ptr: *anyopaque,
pub fn renderHTML(self: Parent, alloc: Allocator) DOMElement.Error![]const u8 {
var el = try self.vtable.dom(self.ptr, alloc);
defer el.deinit();
return el.render(alloc);
}
pub fn deinit(self: Parent, alloc: Allocator) void {
self.vtable.deinit(self.ptr, alloc);
}
fn dom(self: Parent, alloc: Allocator) DOMElement.Error!DOMElement {
return self.vtable.dom(self.ptr, alloc);
}
pub const Paragraph = Modifier("p");
pub const Bold = Modifier("b");
pub const Italic = Modifier("em");
pub const Code = Modifier("code");
pub const Empty = struct {
content: std.ArrayList(Parent),
const Self = @This();
pub fn init(alloc: Allocator) !*Self {
const v = try alloc.create(Self);
v.* = .{ .content = try .initCapacity(alloc, 2) };
return v;
}
pub fn element(self: *Self) Parent {
return .{ .ptr = self, .vtable = .{ .deinit = destroy, .dom = Self.dom } };
}
pub fn deinit(self: *Self, alloc: Allocator) void {
destroy(self, alloc);
}
fn destroy(context: *anyopaque, alloc: Allocator) void {
const self: *Self = @ptrCast(@alignCast(context));
for (self.content.items) |it| it.deinit(alloc);
self.content.deinit(alloc);
alloc.destroy(self);
}
fn dom(context: *anyopaque, alloc: Allocator) DOMElement.Error!DOMElement {
const self: *Self = @ptrCast(@alignCast(context));
var el = DOMElement.initEmpty(alloc);
errdefer el.deinit();
for (self.content.items) |it| try el.appendContent(try it.dom(alloc));
return el;
}
};
pub const Literal = struct {
content: []const u8,
const Self = @This();
pub fn init(alloc: Allocator, content: []const u8) !*Self {
const v = try alloc.create(Self);
v.* = .{ .content = content };
return v;
}
pub fn element(self: *Self) Parent {
return .{ .ptr = self, .vtable = .{ .deinit = destroy, .dom = Self.dom } };
}
pub fn deinit(self: *Self, alloc: Allocator) void {
destroy(self, alloc);
}
fn destroy(context: *anyopaque, alloc: Allocator) void {
const self: *Self = @ptrCast(@alignCast(context));
alloc.destroy(self);
}
fn dom(context: *anyopaque, alloc: Allocator) DOMElement.Error!DOMElement {
const self: *Self = @ptrCast(@alignCast(context));
return DOMElement.initLitEscaped(alloc, self.content);
}
};
pub fn Modifier(comptime tag: []const u8) type {
return struct {
content: std.ArrayList(Parent),
const Self = @This();
pub fn init(alloc: Allocator) !*Self {
const v = try alloc.create(Self);
v.* = .{ .content = try .initCapacity(alloc, 2) };
return v;
}
pub fn element(self: *Self) Parent {
return .{ .ptr = self, .vtable = .{ .deinit = destroy, .dom = Self.dom } };
}
pub fn deinit(self: *Self, alloc: Allocator) void {
destroy(self, alloc);
}
fn destroy(context: *anyopaque, alloc: Allocator) void {
var self: *Self = @ptrCast(@alignCast(context));
for (self.content.items) |it| it.deinit(alloc);
self.content.deinit(alloc);
alloc.destroy(self);
}
fn dom(context: *anyopaque, alloc: Allocator) DOMElement.Error!DOMElement {
const self: *Self = @ptrCast(@alignCast(context));
var el = try DOMElement.init(alloc, .content, tag);
errdefer el.deinit();
for (self.content.items) |it| try el.appendContent(try it.dom(alloc));
return el;
}
};
}
pub const Link = struct {
link: []const u8,
content: Parent,
target: ?[]const u8 = null,
const Self = @This();
pub fn init(alloc: Allocator, content: Parent, link: []const u8) !*Self {
const v = try alloc.create(Self);
v.* = .{
.content = content,
.link = link,
};
return v;
}
pub fn element(self: *Self) Parent {
return .{ .ptr = self, .vtable = .{ .deinit = destroy, .dom = Self.dom } };
}
pub fn deinit(self: *Self, alloc: Allocator) void {
destroy(self, alloc);
}
fn destroy(context: *anyopaque, alloc: Allocator) void {
var self: *Self = @ptrCast(@alignCast(context));
self.content.deinit(alloc);
alloc.destroy(self);
}
fn dom(context: *anyopaque, alloc: Allocator) DOMElement.Error!DOMElement {
const self: *Self = @ptrCast(@alignCast(context));
var el = try DOMElement.init(alloc, .content, "a");
errdefer el.deinit();
try el.appendContent(try self.content.dom(alloc));
try el.setAttribute("href", self.link);
if (self.target) |target| try el.setAttribute("target", target);
return el;
}
};
pub const Title = struct {
level: u3,
content: Parent,
const Self = @This();
pub fn init(alloc: Allocator, level: u3, content: Parent) !*Self {
const v = try alloc.create(Self);
v.* = .{ .level = level, .content = content };
return v;
}
pub fn element(self: *Self) Parent {
return .{ .ptr = self, .vtable = .{ .deinit = destroy, .dom = Self.dom } };
}
pub fn deinit(self: *Self, alloc: Allocator) void {
self.element().deinit(alloc);
}
fn destroy(context: *anyopaque, alloc: Allocator) void {
var self: *Self = @ptrCast(@alignCast(context));
self.content.deinit(alloc);
alloc.destroy(self);
}
fn dom(context: *anyopaque, alloc: Allocator) DOMElement.Error!DOMElement {
const self: *Self = @ptrCast(@alignCast(context));
var el = try DOMElement.init(alloc, .content, switch (self.level) {
1 => "h1",
2 => "h2",
3 => "h3",
4 => "h4",
5 => "h5",
6 => "h6",
else => unreachable,
});
errdefer el.deinit();
try el.appendContent(try self.content.dom(alloc));
return el;
}
};
fn doTest(alloc: Allocator, el: Parent, exp: []const u8) !void {
const got = try el.renderHTML(alloc);
defer alloc.free(got);
std.testing.expect(std.mem.eql(u8, got, exp)) catch |err| {
std.debug.print("{s}\n", .{got});
return err;
};
}
test "paragraph" {
const alloc = std.testing.allocator;
const lit = (try Literal.init(alloc, "hello world")).element();
try doTest(alloc, lit, "hello world");
var p = try Paragraph.init(alloc);
try p.content.append(alloc, lit);
defer p.deinit(alloc);
try doTest(alloc, p.element(), "<p>hello world</p>");
const link = (try Link.init(alloc, (try Literal.init(alloc, "foo")).element(), "example.org")).element();
try doTest(alloc, link, "<a href=\"example.org\">foo</a>");
try p.content.append(alloc, link);
try doTest(alloc, p.element(), "<p>hello world<a href=\"example.org\">foo</a></p>");
}
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