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LibMarkdown: Implement link support

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We can now parse links that like this:

   visit the [SerenityOS home page](http://www.serenityos.org/)

producing proper <a> HTML elements ^)
This commit is contained in:
Sergey Bugaev 2019-10-02 22:35:43 +03:00 • committed by Andreas Kling
parent 3c90aab7dd
commit 30437b0936
2 changed files with 64 additions and 17 deletions
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80
Libraries/LibMarkdown/MDText.cpp
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@ -33,6 +33,8 @@ String MDText::render_to_html() const
{ "code", &Style::code }
};
auto it = open_tags.find([&](const String& open_tag) {
if (open_tag == "a" && current_style.href != span.style.href)
return true;
for (auto& tag_and_flag : tags_and_flags) {
if (open_tag == tag_and_flag.tag && !(span.style.*tag_and_flag.flag))
return true;
@ -48,12 +50,20 @@ String MDText::render_to_html() const
for (auto it2 = --open_tags.end(); it2 >= it; --it2) {
const String& tag = *it2;
builder.appendf("</%s>", tag.characters());
if (tag == "a") {
current_style.href = {};
continue;
}
for (auto& tag_and_flag : tags_and_flags)
if (tag == tag_and_flag.tag)
current_style.*tag_and_flag.flag = false;
}
open_tags.shrink(it.index());
}
if (current_style.href.is_null() && !span.style.href.is_null()) {
open_tags.append("a");
builder.appendf("<a href=\"%s\">", span.style.href.characters());
}
for (auto& tag_and_flag : tags_and_flags) {
if (current_style.*tag_and_flag.flag != span.style.*tag_and_flag.flag) {
open_tags.append(tag_and_flag.tag);
@ -98,6 +108,15 @@ String MDText::render_for_terminal() const
if (needs_styling)
builder.append("\033[0m");
if (!span.style.href.is_null()) {
// When rendering for the terminal, ignore any
// non-absolute links, because the user has no
// chance to follow them anyway.
if (strstr(span.style.href.characters(), "://") != nullptr) {
builder.appendf(" <%s>", span.style.href.characters());
}
}
}
return builder.build();
@ -107,6 +126,17 @@ bool MDText::parse(const StringView& str)
{
Style current_style;
int current_span_start = 0;
int first_span_in_the_current_link = -1;
auto append_span_if_needed = [&](int offset) {
if (current_span_start != offset) {
Span span {
unescape(str.substring_view(current_span_start, offset - current_span_start)),
current_style
};
m_spans.append(move(span));
}
};
for (int offset = 0; offset < str.length(); offset++) {
char ch = str[offset];
@ -120,39 +150,55 @@ bool MDText::parse(const StringView& str)
bool is_special_character = false;
is_special_character |= ch == '`';
if (!current_style.code)
is_special_character |= ch == '*' || ch == '_';
is_special_character |= ch == '*' || ch == '_' || ch == '[' || ch == ']';
if (!is_special_character)
continue;
if (current_span_start != offset) {
Span span {
str.substring_view(current_span_start, offset - current_span_start),
current_style
};
m_spans.append(move(span));
}
append_span_if_needed(offset);
if (ch == '`') {
switch (ch) {
case '`':
current_style.code = !current_style.code;
} else {
break;
case '*':
case '_':
if (offset + 1 < str.length() && str[offset + 1] == ch) {
offset++;
current_style.strong = !current_style.strong;
} else {
current_style.emph = !current_style.emph;
}
break;
case '[':
ASSERT(first_span_in_the_current_link == -1);
first_span_in_the_current_link = m_spans.size();
break;
case ']': {
ASSERT(first_span_in_the_current_link != -1);
ASSERT(offset + 2 < str.length());
offset++;
ASSERT(str[offset] == '(');
offset++;
int start_of_href = offset;
do
offset++;
while (offset < str.length() && str[offset] != ')');
const StringView href = str.substring_view(start_of_href, offset - start_of_href);
for (int i = first_span_in_the_current_link; i < m_spans.size(); i++)
m_spans[i].style.href = href;
first_span_in_the_current_link = -1;
break;
}
default:
ASSERT_NOT_REACHED();
}
current_span_start = offset + 1;
}
if (current_span_start < str.length()) {
Span span {
unescape(str.substring_view(current_span_start, str.length() - current_span_start)),
current_style
};
m_spans.append(move(span));
}
append_span_if_needed(str.length());
return true;
}