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#![doc = include_str!("readme.md")]
/// Token type definitions for LLVM IR.
pub mod token_type;
use crate::{language::LLvmLanguage, lexer::token_type::LLvmTokenType};
use oak_core::{Lexer, LexerCache, LexerState, TextEdit, lexer::LexOutput, source::Source};
pub(crate) type State<'a, S> = LexerState<'a, S, LLvmLanguage>;
/// A lexer for LLVM IR.
///
/// Converts LLVM IR source text into a stream of tokens such as keywords,
/// identifiers, variables (local/global), and symbols.
#[derive(Clone, Debug)]
pub struct LLvmLexer<'config> {
/// Language configuration.
pub config: &'config LLvmLanguage,
}
impl<'config> Lexer<LLvmLanguage> for LLvmLexer<'config> {
fn lex<'a, S: Source + ?Sized>(&self, text: &'a S, _edits: &[TextEdit], cache: &'a mut impl LexerCache<LLvmLanguage>) -> LexOutput<LLvmLanguage> {
let mut state = State::new(text);
let result = self.run(&mut state);
if result.is_ok() {
state.add_eof();
}
state.finish_with_cache(result, cache)
}
}
impl<'config> LLvmLexer<'config> {
/// Creates a new `LLvmLexer` with the given configuration.
pub fn new(config: &'config LLvmLanguage) -> Self {
Self { config }
}
fn run<'a, S: Source + ?Sized>(&self, state: &mut State<'a, S>) -> Result<(), oak_core::OakError> {
while state.not_at_end() {
let start = state.get_position();
let safe_point = start;
if let Some(ch) = state.current() {
match ch {
' ' | '\t' => {
state.advance(1);
state.add_token(LLvmTokenType::Whitespace, start, state.get_position());
}
'\n' | '\r' => {
state.advance(1);
state.add_token(LLvmTokenType::Newline, start, state.get_position());
}
';' => {
state.advance(1);
while let Some(ch) = state.current() {
if ch == '\n' || ch == '\r' {
break;
}
state.advance(ch.len_utf8());
}
state.add_token(LLvmTokenType::Comment, start, state.get_position());
}
'%' => {
state.advance(1);
while let Some(ch) = state.current() {
if !ch.is_alphanumeric() && ch != '.' && ch != '_' && ch != '-' {
break;
}
state.advance(ch.len_utf8());
}
state.add_token(LLvmTokenType::LocalVar, start, state.get_position());
}
'@' => {
state.advance(1);
while let Some(ch) = state.current() {
if !ch.is_alphanumeric() && ch != '.' && ch != '_' && ch != '-' {
break;
}
state.advance(ch.len_utf8());
}
state.add_token(LLvmTokenType::GlobalVar, start, state.get_position());
}
'!' => {
state.advance(1);
while let Some(ch) = state.current() {
if !ch.is_alphanumeric() && ch != '.' && ch != '_' && ch != '-' {
break;
}
state.advance(ch.len_utf8());
}
state.add_token(LLvmTokenType::Metadata, start, state.get_position());
}
'=' => {
state.advance(1);
state.add_token(LLvmTokenType::Equal, start, state.get_position());
}
',' => {
state.advance(1);
state.add_token(LLvmTokenType::Comma, start, state.get_position());
}
'(' => {
state.advance(1);
state.add_token(LLvmTokenType::LParen, start, state.get_position());
}
')' => {
state.advance(1);
state.add_token(LLvmTokenType::RParen, start, state.get_position());
}
'[' => {
state.advance(1);
state.add_token(LLvmTokenType::LBracket, start, state.get_position());
}
']' => {
state.advance(1);
state.add_token(LLvmTokenType::RBracket, start, state.get_position());
}
'{' => {
state.advance(1);
state.add_token(LLvmTokenType::LBrace, start, state.get_position());
}
'}' => {
state.advance(1);
state.add_token(LLvmTokenType::RBrace, start, state.get_position());
}
'*' => {
state.advance(1);
state.add_token(LLvmTokenType::Star, start, state.get_position());
}
':' => {
state.advance(1);
state.add_token(LLvmTokenType::Colon, start, state.get_position());
}
'0'..='9' | '-' => {
state.advance(1);
while let Some(ch) = state.current() {
if !ch.is_ascii_digit() && ch != '.' {
break;
}
state.advance(ch.len_utf8());
}
state.add_token(LLvmTokenType::Number, start, state.get_position());
}
'"' => {
state.advance(1);
while let Some(ch) = state.current() {
if ch == '"' {
state.advance(1);
break;
}
if ch == '\\' {
state.advance(1);
}
let len = state.current().map(|c| c.len_utf8()).unwrap_or(0);
state.advance(len);
}
state.add_token(LLvmTokenType::String, start, state.get_position());
}
_ if ch.is_alphabetic() || ch == '_' || ch == '.' => {
state.advance(1);
while let Some(ch) = state.current() {
if !ch.is_alphanumeric() && ch != '_' && ch != '.' && ch != '-' {
break;
}
state.advance(ch.len_utf8());
}
state.add_token(LLvmTokenType::Keyword, start, state.get_position());
}
_ => {
state.advance(ch.len_utf8());
state.add_token(LLvmTokenType::Error, start, state.get_position());
}
}
}
else {
break;
}
state.advance_if_dead_lock(safe_point)
}
Ok(())
}
}