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const std = @import("std");
const typst = @cImport(@cInclude("typdown_typst.h"));
const Allocator = std.mem.Allocator;
const HTML = Element.HTML;
const Element = @import("Element.zig");
const Node = Element.Node;
const common_template = @embedFile("template.typ");
const content_template = @embedFile("template_content.typ");
const block_template = @embedFile("template_block.typ");
const apply_template = "#show: display.with(param)\n\n";
pub const Error = error{InvalidTypstTemplate} || Allocator.Error;
fn typstInterop(alloc: Allocator, comptime f: fn ([*c]const u8) callconv(.c) [*c]const u8, content: []const u8) ![]const u8 {
const source = try alloc.dupeZ(u8, content);
defer alloc.free(source);
const raw_res = f(source);
const res = try alloc.dupe(u8, std.mem.span(raw_res));
defer typst.typst_freeString(raw_res);
return res;
}
fn generateSVG(alloc: Allocator, content: []const u8) ![]const u8 {
return try typstInterop(alloc, typst.typst_generateSVG, content);
}
fn escape(alloc: Allocator, content: []const u8) ![]const u8 {
return try typstInterop(alloc, typst.typst_escapeMath, content);
}
fn generateFile(alloc: Allocator, template: []const u8, content: []const u8) Error![]const u8 {
var acc = try std.ArrayList(u8).initCapacity(
alloc,
common_template.len + template.len + apply_template.len + content.len,
);
try acc.appendSlice(alloc, common_template);
try acc.appendSlice(alloc, template);
try acc.appendSlice(alloc, apply_template);
try acc.appendSlice(alloc, content);
return try acc.toOwnedSlice(alloc);
}
fn Math(comptime template: []const u8, comptime modFn: *const fn (Allocator, []const u8) Allocator.Error![]const u8) type {
return struct {
content: ?[]const u8 = 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 Element.Wrapper(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 {
const content = self.content orelse return (try HTML.Literal.init(alloc, "")).element();
var arena = std.heap.ArenaAllocator.init(alloc);
defer arena.deinit();
const escaped = try escape(arena.allocator(), content);
const file = generateFile(arena.allocator(), template, try modFn(arena.allocator(), escaped)) catch |err| switch (err) {
Error.InvalidTypstTemplate => @panic("invalid template"),
Error.OutOfMemory => return Error.OutOfMemory,
};
const svg = try generateSVG(arena.allocator(), file);
return (try HTML.Literal.initNoEscape(alloc, svg)).element();
}
};
}
pub const Content = Math(content_template, mathContent);
pub const Block = Math(block_template, mathBlock);
fn mathContent(alloc: Allocator, content: []const u8) Allocator.Error![]const u8 {
const escaped = try escape(alloc, content);
var acc = try std.ArrayList(u8).initCapacity(alloc, escaped.len + 2);
try acc.append(alloc, '$');
try acc.appendSlice(alloc, escaped);
try acc.append(alloc, '$');
return try acc.toOwnedSlice(alloc);
}
fn mathBlock(alloc: Allocator, content: []const u8) Allocator.Error![]const u8 {
const escaped = try escape(alloc, content);
var acc = try std.ArrayList(u8).initCapacity(alloc, escaped.len + 4);
try acc.appendSlice(alloc, "$ ");
try acc.appendSlice(alloc, escaped);
try acc.appendSlice(alloc, " $");
return try acc.toOwnedSlice(alloc);
}
fn doTest(alloc: Allocator, v: []const u8, r: []const u8) !void {
const escaped = try escape(alloc, v);
defer alloc.free(escaped);
std.testing.expect(std.mem.eql(u8, escaped, r)) catch |err| {
std.debug.print("{s}\n", .{escaped});
return err;
};
}
test "escape math" {
const alloc = std.testing.allocator;
try doTest(alloc, "hello", "hello");
try doTest(alloc, "hello $ world", "hello \\$ world");
try doTest(alloc,
\\hello
\\world
, "hello\\ world");
}
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