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LibMarkdown: Implement hard and soft line breaks

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Hard line breaks insert a <br /> when two spaces are at the end of a
line. soft line breaks are just regular newlines, but whitespace is now
stripped before and after them
This commit is contained in:
Peter Elliott 2021-09-10 00:45:45 -06:00 • committed by Andreas Kling
parent af5a07399e
commit 9c0563cc10
3 changed files with 75 additions and 3 deletions
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61
Userland/Libraries/LibMarkdown/Text.cpp
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@ -58,6 +58,20 @@ size_t Text::CodeNode::terminal_length() const
return code->terminal_length();
}
void Text::BreakNode::render_to_html(StringBuilder& builder) const
{
builder.append("<br />");
}
void Text::BreakNode::render_for_terminal(StringBuilder&) const
{
}
size_t Text::BreakNode::terminal_length() const
{
return 0;
}
void Text::TextNode::render_to_html(StringBuilder& builder) const
{
builder.append(escape_html_entities(text));
@ -212,6 +226,8 @@ Vector<Text::Token> Text::tokenize(StringView const& str)
flush_run(false, false, false, false, false);
};
bool in_space = false;
for (size_t offset = 0; offset < str.length(); ++offset) {
auto has = [&](StringView const& seq) {
if (offset + seq.length() > str.length())
@ -229,6 +245,10 @@ Vector<Text::Token> Text::tokenize(StringView const& str)
};
char ch = str[offset];
if (ch != ' ' && in_space) {
flush_token();
in_space = false;
}
if (ch == '\\' && offset + 1 < str.length()) {
current_token.append(str[offset + 1]);
@ -249,6 +269,12 @@ Vector<Text::Token> Text::tokenize(StringView const& str)
true);
offset = run_offset - 1;
} else if (ch == ' ') {
if (!in_space) {
flush_token();
in_space = true;
}
current_token.append(ch);
} else if (has("\n")) {
expect("\n");
} else if (has("[")) {
@ -272,7 +298,11 @@ NonnullOwnPtr<Text::MultiNode> Text::parse_sequence(Vector<Token>::ConstIterator
auto node = make<MultiNode>();
for (; !tokens.is_end(); ++tokens) {
if (tokens->is_run) {
if (tokens->is_space()) {
node->children.append(parse_break(tokens));
} else if (*tokens == "\n") {
node->children.append(parse_newline(tokens));
} else if (tokens->is_run) {
switch (tokens->run_char()) {
case '*':
case '_':
@ -299,6 +329,29 @@ NonnullOwnPtr<Text::MultiNode> Text::parse_sequence(Vector<Token>::ConstIterator
return node;
}
NonnullOwnPtr<Text::Node> Text::parse_break(Vector<Token>::ConstIterator& tokens)
{
auto next_tok = tokens + 1;
if (next_tok.is_end() || *next_tok != "\n")
return make<TextNode>(tokens->data);
if (tokens->data.length() >= 2)
return make<BreakNode>();
return make<MultiNode>();
}
NonnullOwnPtr<Text::Node> Text::parse_newline(Vector<Token>::ConstIterator& tokens)
{
auto node = make<TextNode>(tokens->data);
auto next_tok = tokens + 1;
if (!next_tok.is_end() && next_tok->is_space())
// Skip whitespace after newline.
++tokens;
return node;
}
bool Text::can_open(Token const& opening)
{
return (opening.run_char() == '*' && opening.left_flanking) || (opening.run_char() == '_' && opening.left_flanking && (!opening.right_flanking || opening.punct_before));
@ -325,7 +378,11 @@ NonnullOwnPtr<Text::Node> Text::parse_emph(Vector<Token>::ConstIterator& tokens,
auto child = make<MultiNode>();
for (++tokens; !tokens.is_end(); ++tokens) {
if (tokens->is_run) {
if (tokens->is_space()) {
child->children.append(parse_break(tokens));
} else if (*tokens == "\n") {
child->children.append(parse_newline(tokens));
} else if (tokens->is_run) {
if (can_close_for(opening, *tokens)) {
return make<EmphasisNode>(opening.run_length() >= 2, move(child));
}