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use super::{Error, Highlight, HighlightConfiguration, Highlighter, HtmlRenderer}; use regex::Regex; use std::collections::HashMap; use std::ffi::CStr; use std::os::raw::c_char; use std::process::abort; use std::sync::atomic::AtomicUsize; use std::{fmt, slice, str}; use tree_sitter::Language; pub struct TSHighlighter { languages: HashMap<String, (Option<Regex>, HighlightConfiguration)>, attribute_strings: Vec<&'static [u8]>, highlight_names: Vec<String>, carriage_return_index: Option<usize>, } pub struct TSHighlightBuffer { highlighter: Highlighter, renderer: HtmlRenderer, } #[repr(C)] pub enum ErrorCode { Ok, UnknownScope, Timeout, InvalidLanguage, InvalidUtf8, InvalidRegex, InvalidQuery, } #[no_mangle] pub extern "C" fn ts_highlighter_new( highlight_names: *const *const c_char, attribute_strings: *const *const c_char, highlight_count: u32, ) -> *mut TSHighlighter { let highlight_names = unsafe { slice::from_raw_parts(highlight_names, highlight_count as usize) }; let attribute_strings = unsafe { slice::from_raw_parts(attribute_strings, highlight_count as usize) }; let highlight_names = highlight_names .into_iter() .map(|s| unsafe { CStr::from_ptr(*s).to_string_lossy().to_string() }) .collect::<Vec<_>>(); let attribute_strings = attribute_strings .into_iter() .map(|s| unsafe { CStr::from_ptr(*s).to_bytes() }) .collect(); let carriage_return_index = highlight_names.iter().position(|s| s == "carriage-return"); Box::into_raw(Box::new(TSHighlighter { languages: HashMap::new(), attribute_strings, highlight_names, carriage_return_index, })) } #[no_mangle] pub extern "C" fn ts_highlighter_add_language( this: *mut TSHighlighter, scope_name: *const c_char, injection_regex: *const c_char, language: Language, highlight_query: *const c_char, injection_query: *const c_char, locals_query: *const c_char, highlight_query_len: u32, injection_query_len: u32, locals_query_len: u32, ) -> ErrorCode { let f = move || { let this = unwrap_mut_ptr(this); let scope_name = unsafe { CStr::from_ptr(scope_name) }; let scope_name = scope_name .to_str() .or(Err(ErrorCode::InvalidUtf8))? .to_string(); let injection_regex = if injection_regex.is_null() { None } else { let pattern = unsafe { CStr::from_ptr(injection_regex) }; let pattern = pattern.to_str().or(Err(ErrorCode::InvalidUtf8))?; Some(Regex::new(pattern).or(Err(ErrorCode::InvalidRegex))?) }; let highlight_query = unsafe { slice::from_raw_parts(highlight_query as *const u8, highlight_query_len as usize) }; let highlight_query = str::from_utf8(highlight_query).or(Err(ErrorCode::InvalidUtf8))?; let injection_query = if injection_query_len > 0 { let query = unsafe { slice::from_raw_parts(injection_query as *const u8, injection_query_len as usize) }; str::from_utf8(query).or(Err(ErrorCode::InvalidUtf8))? } else { "" }; let locals_query = if locals_query_len > 0 { let query = unsafe { slice::from_raw_parts(locals_query as *const u8, locals_query_len as usize) }; str::from_utf8(query).or(Err(ErrorCode::InvalidUtf8))? } else { "" }; let mut config = HighlightConfiguration::new(language, highlight_query, injection_query, locals_query) .or(Err(ErrorCode::InvalidQuery))?; config.configure(&this.highlight_names); this.languages.insert(scope_name, (injection_regex, config)); Ok(()) }; match f() { Ok(()) => ErrorCode::Ok, Err(e) => e, } } #[no_mangle] pub extern "C" fn ts_highlight_buffer_new() -> *mut TSHighlightBuffer { Box::into_raw(Box::new(TSHighlightBuffer { highlighter: Highlighter::new(), renderer: HtmlRenderer::new(), })) } #[no_mangle] pub extern "C" fn ts_highlighter_delete(this: *mut TSHighlighter) { drop(unsafe { Box::from_raw(this) }) } #[no_mangle] pub extern "C" fn ts_highlight_buffer_delete(this: *mut TSHighlightBuffer) { drop(unsafe { Box::from_raw(this) }) } #[no_mangle] pub extern "C" fn ts_highlight_buffer_content(this: *const TSHighlightBuffer) -> *const u8 { let this = unwrap_ptr(this); this.renderer.html.as_slice().as_ptr() } #[no_mangle] pub extern "C" fn ts_highlight_buffer_line_offsets(this: *const TSHighlightBuffer) -> *const u32 { let this = unwrap_ptr(this); this.renderer.line_offsets.as_slice().as_ptr() } #[no_mangle] pub extern "C" fn ts_highlight_buffer_len(this: *const TSHighlightBuffer) -> u32 { let this = unwrap_ptr(this); this.renderer.html.len() as u32 } #[no_mangle] pub extern "C" fn ts_highlight_buffer_line_count(this: *const TSHighlightBuffer) -> u32 { let this = unwrap_ptr(this); this.renderer.line_offsets.len() as u32 } #[no_mangle] pub extern "C" fn ts_highlighter_highlight( this: *const TSHighlighter, scope_name: *const c_char, source_code: *const c_char, source_code_len: u32, output: *mut TSHighlightBuffer, cancellation_flag: *const AtomicUsize, ) -> ErrorCode { let this = unwrap_ptr(this); let output = unwrap_mut_ptr(output); let scope_name = unwrap(unsafe { CStr::from_ptr(scope_name).to_str() }); let source_code = unsafe { slice::from_raw_parts(source_code as *const u8, source_code_len as usize) }; let cancellation_flag = unsafe { cancellation_flag.as_ref() }; this.highlight(source_code, scope_name, output, cancellation_flag) } impl TSHighlighter { fn highlight( &self, source_code: &[u8], scope_name: &str, output: &mut TSHighlightBuffer, cancellation_flag: Option<&AtomicUsize>, ) -> ErrorCode { let entry = self.languages.get(scope_name); if entry.is_none() { return ErrorCode::UnknownScope; } let (_, configuration) = entry.unwrap(); let languages = &self.languages; let highlights = output.highlighter.highlight( configuration, source_code, cancellation_flag, move |injection_string| { languages.values().find_map(|(injection_regex, config)| { injection_regex.as_ref().and_then(|regex| { if regex.is_match(injection_string) { Some(config) } else { None } }) }) }, ); if let Ok(highlights) = highlights { output.renderer.reset(); output .renderer .set_carriage_return_highlight(self.carriage_return_index.map(Highlight)); let result = output .renderer .render(highlights, source_code, &|s| self.attribute_strings[s.0]); match result { Err(Error::Cancelled) => { return ErrorCode::Timeout; } Err(Error::InvalidLanguage) => { return ErrorCode::InvalidLanguage; } Err(Error::Unknown) => { return ErrorCode::Timeout; } Ok(()) => ErrorCode::Ok, } } else { ErrorCode::Timeout } } } fn unwrap_ptr<'a, T>(result: *const T) -> &'a T { unsafe { result.as_ref() }.unwrap_or_else(|| { eprintln!("{}:{} - pointer must not be null", file!(), line!()); abort(); }) } fn unwrap_mut_ptr<'a, T>(result: *mut T) -> &'a mut T { unsafe { result.as_mut() }.unwrap_or_else(|| { eprintln!("{}:{} - pointer must not be null", file!(), line!()); abort(); }) } fn unwrap<T, E: fmt::Display>(result: Result<T, E>) -> T { result.unwrap_or_else(|error| { eprintln!("tree-sitter highlight error: {}", error); abort(); }) }