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use super::util;
use ansi_term::Color;
use anyhow::Result;
use lazy_static::lazy_static;
use serde::ser::SerializeMap;
use serde::{Deserialize, Deserializer, Serialize, Serializer};
use serde_json::{json, Value};
use std::collections::HashMap;
use std::fmt::Write;
use std::sync::atomic::AtomicUsize;
use std::time::Instant;
use std::{fs, io, path, str, usize};
use tree_sitter_highlight::{HighlightConfiguration, HighlightEvent, Highlighter, HtmlRenderer};
use tree_sitter_loader::Loader;
pub const HTML_HEADER: &'static str = "
<!doctype HTML>
<head>
<title>Tree-sitter Highlighting</title>
<style>
body {
font-family: monospace
}
.line-number {
user-select: none;
text-align: right;
color: rgba(27,31,35,.3);
padding: 0 10px;
}
.line {
white-space: pre;
}
</style>
</head>
<body>
";
pub const HTML_FOOTER: &'static str = "
</body>
";
lazy_static! {
static ref CSS_STYLES_BY_COLOR_ID: Vec<String> =
serde_json::from_str(include_str!("../vendor/xterm-colors.json")).unwrap();
}
#[derive(Debug, Default)]
pub struct Style {
pub ansi: ansi_term::Style,
pub css: Option<String>,
}
#[derive(Debug)]
pub struct Theme {
pub styles: Vec<Style>,
pub highlight_names: Vec<String>,
}
#[derive(Default, Deserialize, Serialize)]
pub struct ThemeConfig {
#[serde(default)]
pub theme: Theme,
}
impl Theme {
pub fn load(path: &path::Path) -> io::Result<Self> {
let json = fs::read_to_string(path)?;
Ok(serde_json::from_str(&json).unwrap_or_default())
}
pub fn default_style(&self) -> Style {
Style::default()
}
}
impl<'de> Deserialize<'de> for Theme {
fn deserialize<D>(deserializer: D) -> std::result::Result<Theme, D::Error>
where
D: Deserializer<'de>,
{
let mut styles = Vec::new();
let mut highlight_names = Vec::new();
if let Ok(colors) = HashMap::<String, Value>::deserialize(deserializer) {
highlight_names.reserve(colors.len());
styles.reserve(colors.len());
for (name, style_value) in colors {
let mut style = Style::default();
parse_style(&mut style, style_value);
highlight_names.push(name);
styles.push(style);
}
}
Ok(Self {
styles,
highlight_names,
})
}
}
impl Serialize for Theme {
fn serialize<S>(&self, serializer: S) -> std::result::Result<S::Ok, S::Error>
where
S: Serializer,
{
let mut map = serializer.serialize_map(Some(self.styles.len()))?;
for (name, style) in self.highlight_names.iter().zip(&self.styles) {
let style = &style.ansi;
let color = style.foreground.map(|color| match color {
Color::Black => json!("black"),
Color::Blue => json!("blue"),
Color::Cyan => json!("cyan"),
Color::Green => json!("green"),
Color::Purple => json!("purple"),
Color::Red => json!("red"),
Color::White => json!("white"),
Color::Yellow => json!("yellow"),
Color::RGB(r, g, b) => json!(format!("#{:x?}{:x?}{:x?}", r, g, b)),
Color::Fixed(n) => json!(n),
});
if style.is_bold || style.is_italic || style.is_underline {
let mut style_json = HashMap::new();
if let Some(color) = color {
style_json.insert("color", color);
}
if style.is_bold {
style_json.insert("bold", Value::Bool(true));
}
if style.is_italic {
style_json.insert("italic", Value::Bool(true));
}
if style.is_underline {
style_json.insert("underline", Value::Bool(true));
}
map.serialize_entry(&name, &style_json)?;
} else if let Some(color) = color {
map.serialize_entry(&name, &color)?;
} else {
map.serialize_entry(&name, &Value::Null)?;
}
}
map.end()
}
}
impl Default for Theme {
fn default() -> Self {
serde_json::from_str(
r#"
{
"attribute": {"color": 124, "italic": true},
"comment": {"color": 245, "italic": true},
"constant.builtin": {"color": 94, "bold": true},
"constant": 94,
"constructor": 136,
"embedded": null,
"function.builtin": {"color": 26, "bold": true},
"function": 26,
"keyword": 56,
"number": {"color": 94, "bold": true},
"module": 136,
"property": 124,
"operator": {"color": 239, "bold": true},
"punctuation.bracket": 239,
"punctuation.delimiter": 239,
"string.special": 30,
"string": 28,
"tag": 18,
"type": 23,
"type.builtin": {"color": 23, "bold": true},
"variable.builtin": {"bold": true},
"variable.parameter": {"underline": true}
}
"#,
)
.unwrap()
}
}
fn parse_style(style: &mut Style, json: Value) {
if let Value::Object(entries) = json {
for (property_name, value) in entries {
match property_name.as_str() {
"bold" => {
if value == Value::Bool(true) {
style.ansi = style.ansi.bold()
}
}
"italic" => {
if value == Value::Bool(true) {
style.ansi = style.ansi.italic()
}
}
"underline" => {
if value == Value::Bool(true) {
style.ansi = style.ansi.underline()
}
}
"color" => {
if let Some(color) = parse_color(value) {
style.ansi = style.ansi.fg(color);
}
}
_ => {}
}
}
style.css = Some(style_to_css(style.ansi));
} else if let Some(color) = parse_color(json) {
style.ansi = style.ansi.fg(color);
style.css = Some(style_to_css(style.ansi));
} else {
style.css = None;
}
if let Some(Color::RGB(red, green, blue)) = style.ansi.foreground {
if !terminal_supports_truecolor() {
style.ansi = style.ansi.fg(closest_xterm_color(red, green, blue));
}
}
}
fn parse_color(json: Value) -> Option<Color> {
match json {
Value::Number(n) => match n.as_u64() {
Some(n) => Some(Color::Fixed(n as u8)),
_ => None,
},
Value::String(s) => match s.to_lowercase().as_str() {
"black" => Some(Color::Black),
"blue" => Some(Color::Blue),
"cyan" => Some(Color::Cyan),
"green" => Some(Color::Green),
"purple" => Some(Color::Purple),
"red" => Some(Color::Red),
"white" => Some(Color::White),
"yellow" => Some(Color::Yellow),
s => {
if let Some((red, green, blue)) = hex_string_to_rgb(&s) {
Some(Color::RGB(red, green, blue))
} else {
None
}
}
},
_ => None,
}
}
fn hex_string_to_rgb(s: &str) -> Option<(u8, u8, u8)> {
if s.starts_with("#") && s.len() >= 7 {
if let (Ok(red), Ok(green), Ok(blue)) = (
u8::from_str_radix(&s[1..3], 16),
u8::from_str_radix(&s[3..5], 16),
u8::from_str_radix(&s[5..7], 16),
) {
Some((red, green, blue))
} else {
None
}
} else {
None
}
}
fn style_to_css(style: ansi_term::Style) -> String {
let mut result = "style='".to_string();
if style.is_underline {
write!(&mut result, "text-decoration: underline;").unwrap();
}
if style.is_bold {
write!(&mut result, "font-weight: bold;").unwrap();
}
if style.is_italic {
write!(&mut result, "font-style: italic;").unwrap();
}
if let Some(color) = style.foreground {
write_color(&mut result, color);
}
result.push('\'');
result
}
fn write_color(buffer: &mut String, color: Color) {
if let Color::RGB(r, g, b) = &color {
write!(buffer, "color: #{:x?}{:x?}{:x?}", r, g, b).unwrap()
} else {
write!(
buffer,
"color: {}",
match color {
Color::Black => "black",
Color::Blue => "blue",
Color::Red => "red",
Color::Green => "green",
Color::Yellow => "yellow",
Color::Cyan => "cyan",
Color::Purple => "purple",
Color::White => "white",
Color::Fixed(n) => CSS_STYLES_BY_COLOR_ID[n as usize].as_str(),
Color::RGB(_, _, _) => unreachable!(),
}
)
.unwrap()
}
}
fn terminal_supports_truecolor() -> bool {
use std::env;
if let Ok(truecolor) = env::var("COLORTERM") {
truecolor == "truecolor" || truecolor == "24bit"
} else {
false
}
}
fn closest_xterm_color(red: u8, green: u8, blue: u8) -> Color {
use std::cmp::{max, min};
let colors = CSS_STYLES_BY_COLOR_ID
.iter()
.enumerate()
.map(|(color_id, hex)| (color_id as u8, hex_string_to_rgb(hex).unwrap()));
let distances = colors.map(|(color_id, (r, g, b))| {
let r_delta: u32 = (max(r, red) - min(r, red)).into();
let g_delta: u32 = (max(g, green) - min(g, green)).into();
let b_delta: u32 = (max(b, blue) - min(b, blue)).into();
let distance = r_delta.pow(2) + g_delta.pow(2) + b_delta.pow(2);
(color_id, distance)
});
Color::Fixed(distances.min_by(|(_, d1), (_, d2)| d1.cmp(d2)).unwrap().0)
}
pub fn ansi(
loader: &Loader,
theme: &Theme,
source: &[u8],
config: &HighlightConfiguration,
print_time: bool,
cancellation_flag: Option<&AtomicUsize>,
) -> Result<()> {
let stdout = io::stdout();
let mut stdout = stdout.lock();
let time = Instant::now();
let mut highlighter = Highlighter::new();
let events = highlighter.highlight(config, source, cancellation_flag, |string| {
loader.highlight_config_for_injection_string(string)
})?;
let mut style_stack = vec![theme.default_style().ansi];
for event in events {
match event? {
HighlightEvent::HighlightStart(highlight) => {
style_stack.push(theme.styles[highlight.0].ansi);
}
HighlightEvent::HighlightEnd => {
style_stack.pop();
}
HighlightEvent::Source { start, end } => {
style_stack
.last()
.unwrap()
.paint(&source[start..end])
.write_to(&mut stdout)?;
}
}
}
if print_time {
eprintln!("Time: {}ms", time.elapsed().as_millis());
}
Ok(())
}
pub fn html(
loader: &Loader,
theme: &Theme,
source: &[u8],
config: &HighlightConfiguration,
quiet: bool,
print_time: bool,
) -> Result<()> {
use std::io::Write;
let stdout = io::stdout();
let mut stdout = stdout.lock();
let time = Instant::now();
let cancellation_flag = util::cancel_on_stdin();
let mut highlighter = Highlighter::new();
let events = highlighter.highlight(config, source, Some(&cancellation_flag), |string| {
loader.highlight_config_for_injection_string(string)
})?;
let mut renderer = HtmlRenderer::new();
renderer.render(events, source, &move |highlight| {
if let Some(css_style) = &theme.styles[highlight.0].css {
css_style.as_bytes()
} else {
"".as_bytes()
}
})?;
if !quiet {
write!(&mut stdout, "<table>\n")?;
for (i, line) in renderer.lines().enumerate() {
write!(
&mut stdout,
"<tr><td class=line-number>{}</td><td class=line>{}</td></tr>\n",
i + 1,
line
)?;
}
write!(&mut stdout, "</table>\n")?;
}
if print_time {
eprintln!("Time: {}ms", time.elapsed().as_millis());
}
Ok(())
}
#[cfg(test)]
mod tests {
use super::*;
use std::env;
const JUNGLE_GREEN: &'static str = "#26A69A";
const DARK_CYAN: &'static str = "#00AF87";
#[test]
fn test_parse_style() {
let original_environment_variable = env::var("COLORTERM");
let mut style = Style::default();
assert_eq!(style.ansi.foreground, None);
assert_eq!(style.css, None);
env::set_var("COLORTERM", "");
parse_style(&mut style, Value::String(DARK_CYAN.to_string()));
assert_eq!(style.ansi.foreground, Some(Color::Fixed(36)));
assert_eq!(style.css, Some("style=\'color: #0af87\'".to_string()));
env::set_var("COLORTERM", "truecolor");
parse_style(&mut style, Value::String(JUNGLE_GREEN.to_string()));
assert_eq!(style.ansi.foreground, Some(Color::RGB(38, 166, 154)));
assert_eq!(style.css, Some("style=\'color: #26a69a\'".to_string()));
env::set_var("COLORTERM", "");
parse_style(&mut style, Value::String(JUNGLE_GREEN.to_string()));
assert_eq!(style.ansi.foreground, Some(Color::Fixed(36)));
assert_eq!(style.css, Some("style=\'color: #26a69a\'".to_string()));
if let Ok(environment_variable) = original_environment_variable {
env::set_var("COLORTERM", environment_variable);
} else {
env::remove_var("COLORTERM");
}
}
}
