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const std = @import("std");
const Allocator = std.mem.Allocator;
const eql = std.mem.eql;
pub const Kind = enum {
void,
content,
literal,
};
const Self = @This();
kind: Kind,
alloc: Allocator,
tag: ?[]const u8 = null,
attributes: std.StringArrayHashMap([]const u8),
class_list: std.BufSet,
content: std.ArrayList(Self) = .empty,
literal: ?[]const u8 = null,
pub fn init(alloc: Allocator, knd: Kind, tag: []const u8) Self {
return .{
.kind = knd,
.alloc = alloc,
.tag = tag,
.attributes = .init(alloc),
.class_list = .init(alloc),
};
}
pub fn initLit(alloc: Allocator, literal: []const u8) Self {
return .{
.kind = .literal,
.alloc = alloc,
.literal = literal,
.attributes = .init(alloc),
.class_list = .init(alloc),
};
}
pub fn deinit(self: *Self) void {
self.attributes.deinit();
self.class_list.deinit();
for (self.content.items) |it| {
var v = it;
v.deinit();
}
self.content.deinit(self.alloc);
}
pub fn render(self: *const Self, alloc: Allocator) !std.ArrayList(u8) {
var attr = try self.renderAttribute(alloc);
defer attr.deinit(alloc);
var acc = try std.ArrayList(u8).initCapacity(alloc, 2);
errdefer acc.deinit(alloc);
if (self.tag) |tag| {
try acc.append(alloc, '<');
try acc.appendSlice(alloc, tag);
try acc.appendSlice(alloc, attr.items);
try acc.append(alloc, '>');
}
switch (self.kind) {
.void => return acc,
.content => {
for (self.content.items) |it| {
var sub = try it.render(alloc);
defer sub.deinit(alloc);
try acc.appendSlice(alloc, sub.items);
}
},
.literal => try acc.appendSlice(alloc, self.literal.?),
}
if (self.tag) |tag| {
try acc.appendSlice(alloc, "</");
try acc.appendSlice(alloc, tag);
try acc.append(alloc, '>');
}
return acc;
}
fn renderAttribute(self: *const Self, alloc: Allocator) !std.ArrayList(u8) {
var iter = self.attributes.iterator();
if (iter.len == 0) return .empty;
var acc = try std.ArrayList(u8).initCapacity(alloc, 2);
errdefer acc.deinit(alloc);
try acc.append(alloc, ' ');
var i: usize = 0;
while (iter.next()) |it| : (i += 1) {
try acc.appendSlice(alloc, it.key_ptr.*);
try acc.appendSlice(alloc, "=\"");
// MISSING ESCAPING!!!
try acc.appendSlice(alloc, it.value_ptr.*);
try acc.append(alloc, '"');
if (i < iter.len - 1) try acc.append(alloc, ' ');
}
return acc;
}
pub fn setAttribute(self: *Self, k: []const u8, v: []const u8) !void {
try self.attributes.put(k, v);
}
pub fn removeAttribute(self: *Self, k: []const u8) void {
_ = self.attributes.orderedRemove(k);
}
pub fn hasAttribute(self: *Self, k: []const u8) bool {
return self.attributes.contains(k);
}
pub fn appendContent(self: *Self, content: Self) !void {
return self.content.append(self.alloc, content);
}
pub fn initImg(alloc: Allocator, src: []const u8, alt: []const u8) !Self {
var el = init(alloc, .void, "img");
try el.setAttribute("src", src);
try el.setAttribute("alt", alt);
return el;
}
pub fn initContent(alloc: Allocator, tag: []const u8, content: []Self) !Self {
var el = init(alloc, .content, tag);
for (content) |it| try el.appendContent(it);
return el;
}
pub fn initParagraph(alloc: Allocator, content: []const u8) !Self {
var el = init(alloc, .content, "p");
try el.appendContent(initLit(alloc, content));
return el;
}
fn doTest(alloc: Allocator, el: *Self, exp: []const u8) !void {
var rendered = try el.render(alloc);
defer rendered.deinit(alloc);
std.testing.expect(eql(u8, rendered.items, exp)) catch |err| {
std.debug.print("{s}\n", .{rendered.items});
return err;
};
}
test "void element" {
var arena = std.heap.DebugAllocator(.{}).init;
defer _ = arena.deinit();
const alloc = arena.allocator();
var br = init(alloc, .void, "br");
defer br.deinit();
try doTest(alloc, &br, "<br>");
var img = init(alloc, .void, "img");
defer img.deinit();
try img.setAttribute("src", "foo");
try img.setAttribute("alt", "bar");
try doTest(alloc, &img, "<img src=\"foo\" alt=\"bar\">");
var img2 = try initImg(alloc, "foo", "bar");
defer img2.deinit();
try doTest(alloc, &img2, "<img src=\"foo\" alt=\"bar\">");
}
test "content element" {
var arena = std.heap.DebugAllocator(.{}).init;
defer _ = arena.deinit();
const alloc = arena.allocator();
var p = init(alloc, .content, "p");
defer p.deinit();
var content = initLit(alloc, "hello world");
try p.appendContent(content);
try doTest(alloc, &content, "hello world");
try doTest(alloc, &p, "<p>hello world</p>");
var p_managed = try initParagraph(alloc, "hello world");
defer p_managed.deinit();
try doTest(alloc, &p_managed, "<p>hello world</p>");
var div = init(alloc, .content, "div");
defer div.deinit();
try div.setAttribute("class", "foo-bar");
try div.appendContent(try initParagraph(alloc, "hello world"));
try div.appendContent(try initImg(alloc, "example.org", "example"));
try doTest(alloc, &div, "<div class=\"foo-bar\"><p>hello world</p><img src=\"example.org\" alt=\"example\"></div>");
}
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