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pub fn parse(source: &str) -> String {
let lines = source.split("\n");
let mut is_preformatted = false;
let mut block_label: Option<String> = None;
let mut html: String = "".to_owned();
let mut current_line_type: Option<LineType> = None;
let mut heading_stack: Vec<u8> = Vec::new();
for line in lines {
let mut line_type = LineType::Blank;
if line.char_indices().count() > 2 {
let mut end = line.len();
if line.char_indices().count() > 3 {
end = line.char_indices().map(|(i, _)| i).nth(3).unwrap();
}
line_type = identify_line(&line[..end], is_preformatted);
}
match line_type {
LineType::PreformattedToggle => {
is_preformatted = !is_preformatted;
if is_preformatted && line.char_indices().count() > 3 {
block_label = Some(get_partial_line_content(&line_type, line));
} else {
block_label = None;
}
},
_ => {
// Close previous block if needed
if let Some(line) = ¤t_line_type {
if line != &line_type && is_block(line) {
html.push_str(get_line_closer(line));
}
}
// Blocks
if is_block(&line_type) {
if let Some(line) = ¤t_line_type {
if line != &line_type {
html.push_str(&get_line_opener(&line_type, block_label.as_ref()));
}
} else {
html.push_str(&get_line_opener(&line_type, None));
}
let line_content = get_partial_line_content(&line_type, line);
html.push_str(&line_content);
} else {
html.push_str(&get_heading_wrapper(&mut heading_stack, &line_type));
html.push_str(&get_full_line_content(&line_type, line));
}
current_line_type = Some(line_type);
},
}
}
if let Some(line) = ¤t_line_type {
if is_block(line) {
html.push_str(get_line_closer(line));
}
}
html.push_str(&close_heading_wrapper(&mut heading_stack));
html
}
fn is_block(line_type: &LineType) -> bool {
return match line_type {
LineType::PreformattedText | LineType::ListItem | LineType::Quote => true,
_ => false,
}
}
fn get_partial_line_content(line_type: &LineType, line: &str) -> String {
let encoded_line = line.replace("<", "<").replace(">", ">");
return match line_type {
LineType::ListItem => format!("<li>{}</li>", encoded_line[2..].trim()),
LineType::Quote => encoded_line[1..].trim().to_string(),
LineType::PreformattedText => format!("{}\n", encoded_line),
LineType::PreformattedToggle => encoded_line[3..].trim().to_string(),
_ => "".to_string(),
}
}
fn get_full_line_content(line_type: &LineType, line: &str) -> String {
let encoded_line = line.replace("<", "<").replace(">", ">");
match line_type {
LineType::Text => format!("<p>{}</p>\n", encoded_line.trim()),
LineType::Blank => "<br/>\n".to_string(),
LineType::Link => {
let url = get_link_address(line);
if url.starts_with("gemini:") {
format!("<div><a href=\"{}\">{}</a></div>\n", url, get_link_content(line))
} else {
format!("<div><a href=\"{}\">{}</a></div>\n", url.replace(".gmi", ".html"), get_link_content(line))
}
},
LineType::Heading1 => format!("<h1>{}</h1>\n", encoded_line[1..].trim()),
LineType::Heading2 => format!("<h2>{}</h2>\n", encoded_line[2..].trim()),
LineType::Heading3 => format!("<h3>{}</h3>\n", encoded_line[3..].trim()),
_ => "".to_string(),
}
}
fn get_heading_wrapper(heading_stack: &mut Vec<u8>, line_type: &LineType) -> String {
let mut string = String::new();
let current_heading: u8 = match line_type {
LineType::Heading1 => 1,
LineType::Heading2 => 2,
LineType::Heading3 => 3,
_ => 255
};
if current_heading < 255 {
while let Some(open_heading) = heading_stack.pop() {
// You just encountered a more important heading.
// Put it back. Desist.
if open_heading < current_heading {
heading_stack.push(open_heading);
break;
}
string.push_str("</div>");
if open_heading == current_heading {
break;
}
}
heading_stack.push(current_heading);
string.push_str(&format!("<div class=\"h{}\">", current_heading));
}
return string;
}
fn close_heading_wrapper(heading_stack: &mut Vec<u8>) -> String {
let mut string = String::new();
while let Some(_open_heading) = heading_stack.pop() {
string.push_str("</div>");
}
return string;
}
fn get_line_opener(line_type: &LineType, block_label: Option<&String>) -> String {
match line_type {
LineType::ListItem => "<ul>".to_string(),
LineType::Quote => "<blockquote>".to_string(),
LineType::PreformattedText => {
if let Some(label) = &block_label {
return format!("<pre role=\"img\" aria-label=\"h{}\">", label);
} else {
return "<pre>".to_string();
}
},
_ => "".to_string(),
}
}
fn get_line_closer(line_type: &LineType) -> &'static str {
match line_type {
LineType::ListItem => "</ul>\n",
LineType::Quote => "</blockquote>\n",
LineType::PreformattedText => "</pre>\n",
_ => "",
}
}
fn get_link_content(line: &str) -> &str {
let components: Vec<&str> = line[2..].trim().splitn(2, " ").collect();
if components.len() > 1 {
return components[1].trim()
}
components[0].trim()
}
fn get_link_address(line: &str) -> &str {
let components: Vec<&str> = line[2..].trim().splitn(2, " ").collect();
components[0].trim()
}
fn identify_line(line: &str, is_preformatted: bool) -> LineType {
if line.starts_with("```") {
return LineType::PreformattedToggle;
}
if is_preformatted {
return LineType::PreformattedText;
}
if line.is_empty() {
return LineType::Blank;
}
if line.starts_with("=>") {
return LineType::Link;
}
if line.starts_with("* ") {
return LineType::ListItem;
}
if line.starts_with(">") {
return LineType::Quote;
}
if line.starts_with("###") {
return LineType::Heading3;
}
if line.starts_with("##") {
return LineType::Heading2;
}
if line.starts_with("#") {
return LineType::Heading1;
}
LineType::Text
}
#[derive(PartialEq, Eq)]
enum LineType {
Text,
Blank,
Link,
PreformattedToggle,
PreformattedText,
Heading1,
Heading2,
Heading3,
ListItem,
Quote
}
|
