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const std = @import("std");
const Document = @import("Document.zig");
const Node = Document.Node;
const assert = std.debug.assert;
const Writer = std.Io.Writer;
/// A Markdown document renderer.
///
/// Each concrete `Renderer` type has a `renderDefault` function, with the
/// intention that custom `renderFn` implementations can call `renderDefault`
/// for node types for which they require no special rendering.
pub fn Renderer(comptime Context: type) type {
return struct {
renderFn: *const fn (
r: Self,
doc: Document,
node: Node.Index,
writer: *Writer,
) Writer.Error!void = renderDefault,
context: Context,
const Self = @This();
pub fn render(r: Self, doc: Document, writer: *Writer) Writer.Error!void {
try r.renderFn(r, doc, .root, writer);
}
pub fn renderDefault(
r: Self,
doc: Document,
node: Node.Index,
writer: *Writer,
) Writer.Error!void {
const data = doc.nodes.items(.data)[@intFromEnum(node)];
switch (doc.nodes.items(.tag)[@intFromEnum(node)]) {
.root => {
for (doc.extraChildren(data.container.children)) |child| {
try r.renderFn(r, doc, child, writer);
}
},
.list => {
if (data.list.start.asNumber()) |start| {
if (start == 1) {
try writer.writeAll("<ol>\n");
} else {
try writer.print("<ol start=\"{d}\">\n", .{start});
}
} else {
try writer.writeAll("<ul>\n");
}
for (doc.extraChildren(data.list.children)) |child| {
try r.renderFn(r, doc, child, writer);
}
if (data.list.start.asNumber() != null) {
try writer.writeAll("</ol>\n");
} else {
try writer.writeAll("</ul>\n");
}
},
.list_item => {
try writer.writeAll("<li>");
for (doc.extraChildren(data.list_item.children)) |child| {
if (data.list_item.tight and doc.nodes.items(.tag)[@intFromEnum(child)] == .paragraph) {
const para_data = doc.nodes.items(.data)[@intFromEnum(child)];
for (doc.extraChildren(para_data.container.children)) |para_child| {
try r.renderFn(r, doc, para_child, writer);
}
} else {
try r.renderFn(r, doc, child, writer);
}
}
try writer.writeAll("</li>\n");
},
.table => {
try writer.writeAll("<table>\n");
for (doc.extraChildren(data.container.children)) |child| {
try r.renderFn(r, doc, child, writer);
}
try writer.writeAll("</table>\n");
},
.table_row => {
try writer.writeAll("<tr>\n");
for (doc.extraChildren(data.container.children)) |child| {
try r.renderFn(r, doc, child, writer);
}
try writer.writeAll("</tr>\n");
},
.table_cell => {
if (data.table_cell.info.header) {
try writer.writeAll("<th");
} else {
try writer.writeAll("<td");
}
switch (data.table_cell.info.alignment) {
.unset => try writer.writeAll(">"),
else => |a| try writer.print(" style=\"text-align: {s}\">", .{@tagName(a)}),
}
for (doc.extraChildren(data.table_cell.children)) |child| {
try r.renderFn(r, doc, child, writer);
}
if (data.table_cell.info.header) {
try writer.writeAll("</th>\n");
} else {
try writer.writeAll("</td>\n");
}
},
.heading => {
try writer.print("<h{d}>", .{data.heading.level});
for (doc.extraChildren(data.heading.children)) |child| {
try r.renderFn(r, doc, child, writer);
}
try writer.print("</h{d}>\n", .{data.heading.level});
},
.code_block => {
const content = doc.string(data.code_block.content);
try writer.print("<pre><code>{f}</code></pre>\n", .{fmtHtml(content)});
},
.blockquote => {
try writer.writeAll("<blockquote>\n");
for (doc.extraChildren(data.container.children)) |child| {
try r.renderFn(r, doc, child, writer);
}
try writer.writeAll("</blockquote>\n");
},
.paragraph => {
try writer.writeAll("<p>");
for (doc.extraChildren(data.container.children)) |child| {
try r.renderFn(r, doc, child, writer);
}
try writer.writeAll("</p>\n");
},
.thematic_break => {
try writer.writeAll("<hr />\n");
},
.link => {
const target = doc.string(data.link.target);
try writer.print("<a href=\"{f}\">", .{fmtHtml(target)});
for (doc.extraChildren(data.link.children)) |child| {
try r.renderFn(r, doc, child, writer);
}
try writer.writeAll("</a>");
},
.autolink => {
const target = doc.string(data.text.content);
try writer.print("<a href=\"{0f}\">{0f}</a>", .{fmtHtml(target)});
},
.image => {
const target = doc.string(data.link.target);
try writer.print("<img src=\"{f}\" alt=\"", .{fmtHtml(target)});
for (doc.extraChildren(data.link.children)) |child| {
try renderInlineNodeText(doc, child, writer);
}
try writer.writeAll("\" />");
},
.strong => {
try writer.writeAll("<strong>");
for (doc.extraChildren(data.container.children)) |child| {
try r.renderFn(r, doc, child, writer);
}
try writer.writeAll("</strong>");
},
.emphasis => {
try writer.writeAll("<em>");
for (doc.extraChildren(data.container.children)) |child| {
try r.renderFn(r, doc, child, writer);
}
try writer.writeAll("</em>");
},
.code_span => {
const content = doc.string(data.text.content);
try writer.print("<code>{f}</code>", .{fmtHtml(content)});
},
.text => {
const content = doc.string(data.text.content);
try writer.print("{f}", .{fmtHtml(content)});
},
.line_break => {
try writer.writeAll("<br />\n");
},
}
}
};
}
/// Renders an inline node as plain text. Asserts that the node is an inline and
/// has no non-inline children.
pub fn renderInlineNodeText(
doc: Document,
node: Node.Index,
writer: *Writer,
) Writer.Error!void {
const data = doc.nodes.items(.data)[@intFromEnum(node)];
switch (doc.nodes.items(.tag)[@intFromEnum(node)]) {
.root,
.list,
.list_item,
.table,
.table_row,
.table_cell,
.heading,
.code_block,
.blockquote,
.paragraph,
.thematic_break,
=> unreachable, // Blocks
.link, .image => {
for (doc.extraChildren(data.link.children)) |child| {
try renderInlineNodeText(doc, child, writer);
}
},
.strong => {
for (doc.extraChildren(data.container.children)) |child| {
try renderInlineNodeText(doc, child, writer);
}
},
.emphasis => {
for (doc.extraChildren(data.container.children)) |child| {
try renderInlineNodeText(doc, child, writer);
}
},
.autolink, .code_span, .text => {
const content = doc.string(data.text.content);
try writer.print("{f}", .{fmtHtml(content)});
},
.line_break => {
try writer.writeAll("\n");
},
}
}
pub fn fmtHtml(bytes: []const u8) std.fmt.Alt([]const u8, formatHtml) {
return .{ .data = bytes };
}
fn formatHtml(bytes: []const u8, w: *Writer) Writer.Error!void {
for (bytes) |b| switch (b) {
'<' => try w.writeAll("<"),
'>' => try w.writeAll(">"),
'&' => try w.writeAll("&"),
'"' => try w.writeAll("""),
else => try w.writeByte(b),
};
}
|
