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Escape special characters and handle whitespace in Markdown

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Adrià Arrufat
2026-02-16 00:10:00 +09:00
parent 1b5efea6eb
commit be4e6e5ba5
1 changed files with 106 additions and 2 deletions
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108
src/browser/markdown.zig
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@@ -154,7 +154,7 @@ fn renderElement(el: *Element, state: *State, writer: *std.Io.Writer, page: *Pag
.img => {
try writer.writeAll("![");
if (el.getAttributeSafe(comptime .wrap("alt"))) |alt| {
try writer.writeAll(alt);
try escapeMarkdown(writer, alt);
}
try writer.writeAll("](");
if (el.getAttributeSafe(comptime .wrap("src"))) |src| {
@@ -243,6 +243,18 @@ fn renderText(text: []const u8, state: *State, writer: *std.Io.Writer) anyerror!
return;
}
// Check for pure whitespace
const is_all_whitespace = for (text) |c| {
if (!std.ascii.isWhitespace(c)) break false;
} else true;
if (is_all_whitespace) {
if (!state.last_char_was_newline) {
try writer.writeByte(' ');
}
return;
}
// Collapse whitespace
var it = std.mem.tokenizeAny(u8, text, " \t\n\r");
var first = true;
@@ -261,7 +273,7 @@ fn renderText(text: []const u8, state: *State, writer: *std.Io.Writer) anyerror!
try writer.writeByte(' ');
}
try writer.writeAll(word);
try escapeMarkdown(writer, word);
state.last_char_was_newline = false;
first = false;
}
@@ -274,9 +286,101 @@ fn renderText(text: []const u8, state: *State, writer: *std.Io.Writer) anyerror!
}
}
fn escapeMarkdown(writer: *std.Io.Writer, text: []const u8) !void {
// Escaping: \ ` * _ { } [ ] ( ) # + - . ! | < >
for (text) |c| {
switch (c) {
'\\',
'`',
'*',
'_',
'{',
'}',
'[',
']',
'(',
')',
'#',
'+',
'-',
'.',
'!',
'|',
'<',
'>',
=> {
try writer.writeByte('\\');
try writer.writeByte(c);
},
else => try writer.writeByte(c),
}
}
}
fn writeIndentation(level: usize, writer: *std.Io.Writer) anyerror!void {
var i: usize = 0;
while (i < level) : (i += 1) {
try writer.writeAll(" ");
}
}
test "markdown: basic" {
const testing = @import("../testing.zig");
const page = try testing.test_session.createPage();
defer testing.test_session.removePage();
const doc = page.window._document;
const div = try doc.createElement("div", null, page);
try div.asNode().setTextContent("Hello world", page);
var aw: std.Io.Writer.Allocating = .init(testing.allocator);
defer aw.deinit();
try dump(div.asNode(), .{}, &aw.writer, page);
try testing.expectString("Hello world\n", aw.written());
}
test "markdown: whitespace" {
const testing = @import("../testing.zig");
const page = try testing.test_session.createPage();
defer testing.test_session.removePage();
const doc = page.window._document;
const div = try doc.createElement("div", null, page);
const s1 = try doc.createElement("span", null, page);
try s1.asNode().setTextContent("A", page);
const s2 = try doc.createElement("span", null, page);
try s2.asNode().setTextContent("B", page);
_ = try div.asNode().appendChild(s1.asNode(), page);
// Add text node with space
const txt = try page.createTextNode(" ");
_ = try div.asNode().appendChild(txt, page);
_ = try div.asNode().appendChild(s2.asNode(), page);
var aw = std.Io.Writer.Allocating.init(testing.allocator);
defer aw.deinit();
try dump(div.asNode(), .{}, &aw.writer, page);
try testing.expectString("A B\n", aw.written());
}
test "markdown: escaping" {
const testing = @import("../testing.zig");
const page = try testing.test_session.createPage();
defer testing.test_session.removePage();
const doc = page.window._document;
const div = try doc.createElement("div", null, page);
const p = try doc.createElement("p", null, page);
try p.asNode().setTextContent("# Not a header", page);
_ = try div.asNode().appendChild(p.asNode(), page);
var aw: std.Io.Writer.Allocating = .init(testing.allocator);
defer aw.deinit();
try dump(div.asNode(), .{}, &aw.writer, page);
try testing.expectString("\n\\# Not a header\n", aw.written());
}