lots of work, not in working state
This commit is contained in:
Scott Richmond
parent
b49e4b28fe
commit
4f119ec4f4
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@ -7,5 +7,5 @@ edition = "2021"
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[dependencies]
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ariadne = { git = "https://github.com/zesterer/ariadne" }
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chumsky = { git = "https://github.com/zesterer/chumsky" }
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chumsky = { git = "https://github.com/zesterer/chumsky", features = ["label"] }
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imbl = "3.0.0"
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192
src/lib.rs
192
src/lib.rs
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@ -1,192 +0,0 @@
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use chumsky::prelude::*;
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use std::fmt;
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pub type Span = SimpleSpan<usize>;
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#[derive(Clone, Debug, PartialEq)]
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pub enum Token<'src> {
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Number(f64),
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Word(&'src str),
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Boolean(bool),
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Keyword(&'src str),
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String(&'src str),
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Reserved(&'src str),
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Nil,
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Punctuation(&'src str),
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}
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impl<'src> fmt::Display for Token<'src> {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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match self {
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Token::Number(n) => write!(f, "{}", n),
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Token::Word(w) => write!(f, "{}", w),
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Token::Boolean(b) => write!(f, "{}", b),
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Token::Keyword(k) => write!(f, ":{}", k),
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Token::String(s) => write!(f, "{}", s),
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Token::Reserved(r) => write!(f, "{}", r),
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Token::Nil => write!(f, "nil"),
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Token::Punctuation(p) => write!(f, "{}", p),
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}
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}
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}
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pub fn lexer<'src>(
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) -> impl Parser<'src, &'src str, Vec<(Token<'src>, Span)>, extra::Err<Rich<'src, char, Span>>> {
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let number = just('-')
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.or_not()
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.then(text::int(10).then(just('.').then(text::digits(10)).or_not()))
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.to_slice()
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.from_str()
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.unwrapped()
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.map(Token::Number);
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let word = any()
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.filter(char::is_ascii_lowercase)
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.then(
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any()
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.filter(char::is_ascii_alphanumeric)
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.or(one_of("*/?!_"))
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.repeated(),
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)
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.to_slice();
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let reserved_or_word = word.map(|word: &str| match word {
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"true" => Token::Boolean(true),
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"false" => Token::Boolean(false),
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"nil" => Token::Nil,
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"as" | "box" | "do" | "else" | "fn" | "if" | "import" | "let" | "loop" | "match" | "ns"
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| "panic!" | "pkg" | "recur" | "repeat" | "test" | "then" | "use" | "when" | "with" => {
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Token::Reserved(word)
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}
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_ => Token::Word(word),
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});
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let keyword = just(':').ignore_then(word.clone()).map(Token::Keyword);
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let string = just('"')
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.ignore_then(none_of("\"").repeated().to_slice())
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.then_ignore(just('"'))
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.map(Token::String);
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let punctuation = one_of(",=[]{}()>;\n")
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.to_slice()
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.or(just("->"))
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.or(just("..."))
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.or(just("#{"))
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.or(just("${"))
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.map(Token::Punctuation);
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let token = number
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.or(reserved_or_word)
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.or(keyword)
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.or(string)
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.or(punctuation);
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let comment = just('&')
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.ignore_then(any().and_is(just('\n').not()).repeated())
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.repeated();
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let ludus_ws = just(' ').or(just('\t')).repeated();
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token
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.map_with(|tok, e| (tok, e.span()))
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.padded_by(ludus_ws)
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.padded_by(comment)
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.recover_with(skip_then_retry_until(any().ignored(), end()))
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.repeated()
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.collect()
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}
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#[cfg(test)]
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mod tests {
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use crate::lexer;
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use crate::Token;
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use chumsky::prelude::*;
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#[test]
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fn it_lexes_positive_ints() {
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let (mytoken, _) = lexer().parse("42").unwrap()[0].clone();
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assert_eq!(mytoken, Token::Number(42.0))
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}
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#[test]
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fn it_lexes_negative_ints() {
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let (mytoken, _) = lexer().parse("-42").unwrap()[0].clone();
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assert_eq!(mytoken, Token::Number(-42.0))
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}
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#[test]
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fn it_lexes_positive_floats() {
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let (mytoken, _) = lexer().parse("42.032").unwrap()[0].clone();
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assert_eq!(mytoken, Token::Number(42.032))
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}
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#[test]
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fn it_lexes_positive_decimals() {
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let (mytoken, _) = lexer().parse("0.123").unwrap()[0].clone();
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assert_eq!(mytoken, Token::Number(0.123))
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}
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#[test]
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fn it_lexes_negative_floats() {
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let mytoken = lexer().parse("-42.123").unwrap()[0].clone().0;
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assert_eq!(mytoken, Token::Number(-42.123))
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}
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#[test]
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fn it_lexes_negative_decimals() {
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let mytoken = lexer().parse("-0.123").unwrap()[0].clone().0;
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assert_eq!(mytoken, Token::Number(-0.123))
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}
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#[test]
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fn it_lexes_bools() {
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let tt = lexer().parse("true").unwrap()[0].clone().0;
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assert_eq!(tt, Token::Boolean(true));
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let ff = lexer().parse("false").unwrap()[0].clone().0;
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assert_eq!(ff, Token::Boolean(false))
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}
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#[test]
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fn it_lexes_words() {
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let mytoken = lexer().parse("foo").unwrap()[0].clone().0;
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assert_eq!(mytoken, Token::Word("foo"))
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}
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#[test]
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fn it_lexes_keywords() {
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let kw = lexer().parse(":foo").unwrap()[0].clone().0;
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assert_eq!(kw, Token::Keyword("foo"))
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}
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#[test]
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fn it_lexes_strings() {
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let s = lexer().parse("\"foo bar baz\"").unwrap()[0].clone().0;
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assert_eq!(s, Token::String("foo bar baz"))
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}
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#[test]
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fn it_ignores_comments() {
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let e = lexer().parse("foo &bar\nbaz").unwrap();
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assert_eq!(e[0].0, Token::Word("foo"));
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assert_eq!(e[2].0, Token::Word("baz"))
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}
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#[test]
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fn it_lexes_multiple_tokens() {
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let toks = lexer().parse("foo;bar\nbaz").unwrap();
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assert_eq!(toks[0].0, Token::Word("foo"));
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assert_eq!(toks[2].0, Token::Word("bar"));
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assert_eq!(toks[4].0, Token::Word("baz"))
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}
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#[test]
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fn it_lexes_collections() {
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let toks = lexer().parse("(1, 2)").unwrap();
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assert_eq!(toks[0].0, Token::Punctuation("("));
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assert_eq!(toks[1].0, Token::Number(1.0));
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assert_eq!(toks[2].0, Token::Punctuation(","));
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assert_eq!(toks[3].0, Token::Number(2.0));
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assert_eq!(toks[4].0, Token::Punctuation(")"))
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}
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}
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865
src/main.rs
Normal file
865
src/main.rs
Normal file
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@ -0,0 +1,865 @@
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// an implementation of Ludus
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// curently left undone (and not adding for a while yet):
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// * sets
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// * interpolated strings & string patterns
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// * pkgs, namespaces, imports, `use` forms
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// * with forms
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// * test forms
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// * ignored words
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// todo:
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// * [ ] rewrite fn parser to use chumsky::Recursive::declare/define
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// - [ ] do this to extract/simplify/DRY things like tuple patterns, fn clauses, etc.
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// * [ ] Work around chumsky::Stream::from_iter().spanned disappearing in most recent version
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// * [x] investigate using labels (which is behind a compiler flag, somehow)
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// * [ ] wire up Ariadne parsing errors
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// * [ ] validation
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// * [ ] break this out into multiple files
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// * [ ] write a tree-walk VM
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// - [ ] learn how to deal with lifetimes
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// - [ ] with stack mechanics and refcounting
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// - [ ] with tail-call optimization
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// * [ ] write `base` in Rust
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// * [ ] turn this into a library function
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// * [ ] compile this into WASM
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// * [ ] perf testing
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use chumsky::{
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input::{Stream, ValueInput},
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prelude::*,
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};
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use imbl::{HashMap, Vector};
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use std::fmt;
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pub type Span = SimpleSpan<usize>;
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pub type Spanned<T> = (T, Span);
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#[derive(Clone, Debug, PartialEq)]
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pub enum Token<'src> {
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Nil,
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Number(f64),
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Word(&'src str),
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Boolean(bool),
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Keyword(&'src str),
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String(&'src str),
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// todo: hard code these types
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Reserved(&'src str),
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Punctuation(&'src str),
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}
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impl<'src> fmt::Display for Token<'src> {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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match self {
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Token::Number(n) => write!(f, "[Number {}]", n),
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Token::Word(w) => write!(f, "[Word {}]", w),
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Token::Boolean(b) => write!(f, "[Boolean {}]", b),
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Token::Keyword(k) => write!(f, "[Keyword :{}]", k),
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Token::String(s) => write!(f, "[String {}]", s),
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Token::Reserved(r) => write!(f, "[Reserved {}]", r),
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Token::Nil => write!(f, "[nil]"),
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Token::Punctuation(p) => write!(f, "[Punctuation {}]", p),
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}
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}
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}
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pub fn lexer<'src>(
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) -> impl Parser<'src, &'src str, Vec<(Token<'src>, Span)>, extra::Err<Rich<'src, char, Span>>> {
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let number = just('-')
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.or_not()
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.then(text::int(10).then(just('.').then(text::digits(10)).or_not()))
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.to_slice()
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.from_str()
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.unwrapped()
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.map(Token::Number);
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let word = any()
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.filter(char::is_ascii_lowercase)
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.then(
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any()
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.filter(char::is_ascii_alphanumeric)
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.or(one_of("*/?!_"))
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.repeated(),
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)
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.to_slice();
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let reserved_or_word = word.map(|word: &str| match word {
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"true" => Token::Boolean(true),
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"false" => Token::Boolean(false),
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"nil" => Token::Nil,
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// todo: hard code these as type constructors
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"as" | "box" | "do" | "else" | "fn" | "if" | "let" | "loop" | "match" | "panic!"
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| "recur" | "repeat" | "then" | "when" | "with" => Token::Reserved(word),
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_ => Token::Word(word),
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});
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let keyword = just(':').ignore_then(word.clone()).map(Token::Keyword);
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let string = just('"')
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.ignore_then(none_of("\"").repeated().to_slice())
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.then_ignore(just('"'))
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.map(Token::String);
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// todo: hard code these as type constructors
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let punctuation = one_of(",=[]{}()>;\n_")
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.to_slice()
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.or(just("->"))
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.or(just("..."))
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.or(just("#{"))
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.or(just("${"))
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.map(Token::Punctuation);
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let token = number
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.or(reserved_or_word)
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.or(keyword)
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.or(string)
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.or(punctuation);
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let comment = just('&')
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.ignore_then(any().and_is(just('\n').not()).repeated())
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.repeated();
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let ludus_ws = just(' ').or(just('\t')).repeated();
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token
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.map_with(|tok, e| (tok, e.span()))
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.padded_by(ludus_ws)
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.padded_by(comment)
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.recover_with(skip_then_retry_until(any().ignored(), end()))
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.repeated()
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.collect()
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}
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#[derive(Clone, Debug, PartialEq)]
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struct Clause<'src> {
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patt: Pattern<'src>,
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span: Span,
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body: Ast<'src>,
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}
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#[derive(Clone, Debug, PartialEq)]
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struct Fn<'src> {
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name: &'src str,
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span: Span,
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body: Vec<Clause<'src>>,
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}
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#[derive(Clone, Debug, PartialEq)]
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enum Value<'src> {
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Nil,
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Boolean(bool),
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Number(f64),
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Keyword(&'src str),
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String(&'src str),
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Tuple(Vec<Self>), // on the heap for now
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List(Vector<Self>), // ref-counted, immutable, persistent
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Dict(HashMap<&'src str, Self>), // ref-counted, immutable, persistent
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Fn(&'src Fn<'src>),
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// Set(HashSet<Self>),
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// Sets are hard
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// Sets require Eq
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// Eq is not implemented on f64, because NaNs
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// We could use ordered_float::NotNan
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// Let's defer that
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// We're not really using sets in Ludus
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// Other things we're not implementing yet:
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// pkgs, nses, tests
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}
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impl<'src> fmt::Display for Value<'src> {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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match self {
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Value::Nil => write!(f, "nil"),
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Value::Boolean(b) => write!(f, "{}", b),
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Value::Number(n) => write!(f, "{}", n),
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Value::Keyword(k) => write!(f, ":{}", k),
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Value::String(s) => write!(f, "\"{}\"", s),
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Value::Fn(fun) => write!(f, "fn {}", fun.name),
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Value::Tuple(t) => write!(
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f,
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"({})",
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t.iter()
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.map(|x| x.to_string())
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.collect::<Vec<_>>()
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.join(", ")
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),
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Value::List(l) => write!(
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f,
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"[{}]",
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l.iter()
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.map(|x| x.to_string())
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.collect::<Vec<_>>()
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.join(", ")
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),
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Value::Dict(d) => write!(f, "#{{{:?}}}", d),
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}
|
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}
|
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}
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|
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#[derive(Clone, Debug, PartialEq)]
|
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enum Ast<'src> {
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Error,
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Placeholder,
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Value(Value<'src>),
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Word(&'src str),
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||||
Block(Vec<Spanned<Self>>),
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If(Box<Spanned<Self>>, Box<Spanned<Self>>, Box<Spanned<Self>>),
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||||
Tuple(Vec<Spanned<Self>>),
|
||||
Arguments(Vec<Spanned<Self>>),
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List(Vec<Spanned<Self>>),
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Pair(Value<'src>, Box<Spanned<Self>>),
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Dict(Vec<Spanned<Self>>),
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Let(Box<Spanned<Pattern<'src>>>, Box<Spanned<Self>>),
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Box(&'src str, Box<Spanned<Self>>),
|
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Synthetic(Box<Spanned<Self>>, Box<Spanned<Self>>, Vec<Spanned<Self>>),
|
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WhenClause(Box<Spanned<Self>>, Box<Spanned<Self>>),
|
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When(Vec<Spanned<Self>>),
|
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MatchClause(Box<Spanned<Pattern<'src>>>, Box<Spanned<Self>>),
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Match(Box<Spanned<Self>>, Vec<Spanned<Self>>),
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FnClause(Box<Spanned<Pattern<'src>>>, Box<Spanned<Self>>),
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Fn(&'src str, Vec<Spanned<Self>>),
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FnDeclaration(&'src str),
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||||
Panic(Box<Spanned<Self>>),
|
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Do(Vec<Spanned<Self>>),
|
||||
Repeat(Box<Spanned<Self>>, Box<Spanned<Self>>),
|
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Loop(Box<Spanned<Self>>, Vec<Spanned<Self>>),
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Recur(Vec<Spanned<Self>>),
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||||
}
|
||||
|
||||
impl<'src> fmt::Display for Ast<'src> {
|
||||
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
|
||||
match self {
|
||||
Ast::Error => write!(f, "Error"),
|
||||
Ast::Value(v) => write!(f, "Value: {}", v),
|
||||
Ast::Word(w) => write!(f, "Word: {}", w),
|
||||
Ast::Block(b) => write!(
|
||||
f,
|
||||
"Block: <{}>",
|
||||
b.iter()
|
||||
.map(|(line, _)| line.to_string())
|
||||
.collect::<Vec<_>>()
|
||||
.join("\n")
|
||||
),
|
||||
Ast::If(cond, then_branch, else_branch) => write!(
|
||||
f,
|
||||
"If: {} Then: {} Else: {}",
|
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cond.0, then_branch.0, else_branch.0
|
||||
),
|
||||
Ast::Let(pattern, expression) => {
|
||||
write!(f, "Let: {} = {}", pattern.0, expression.0)
|
||||
}
|
||||
Ast::Pair(kw, expr) => write!(f, "{} {}", kw, expr.0),
|
||||
Ast::Dict(entries) => write!(
|
||||
f,
|
||||
"#{{{}}}",
|
||||
entries
|
||||
.iter()
|
||||
.map(|(pair, _)| pair.to_string())
|
||||
.collect::<Vec<_>>()
|
||||
.join(", ")
|
||||
),
|
||||
Ast::List(l) => write!(
|
||||
f,
|
||||
"List: [{}]",
|
||||
l.iter()
|
||||
.map(|(line, _)| line.to_string())
|
||||
.collect::<Vec<_>>()
|
||||
.join("\n")
|
||||
),
|
||||
Ast::Tuple(t) | Ast::Arguments(t) => write!(
|
||||
f,
|
||||
"Tuple: ({})",
|
||||
t.iter()
|
||||
.map(|(line, _)| line.to_string())
|
||||
.collect::<Vec<_>>()
|
||||
.join("\n")
|
||||
),
|
||||
Ast::Synthetic(root, first, rest) => write!(
|
||||
f,
|
||||
"Synth: [{}, {}, {}]",
|
||||
root.0,
|
||||
first.0,
|
||||
rest.iter()
|
||||
.map(|(term, _)| term.to_string())
|
||||
.collect::<Vec<_>>()
|
||||
.join("\n")
|
||||
),
|
||||
_ => unimplemented!(),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(Clone, Debug, PartialEq)]
|
||||
enum Pattern<'src> {
|
||||
Atom(Value<'src>),
|
||||
Word(&'src str),
|
||||
Placeholder,
|
||||
Tuple(Vec<Spanned<Self>>),
|
||||
List(Vec<Spanned<Self>>),
|
||||
// is this the right representation for Dicts?
|
||||
// Could/should this also be a Vec?
|
||||
Pair(Value<'src>, Box<Spanned<Self>>),
|
||||
Dict(Vec<Spanned<Self>>),
|
||||
}
|
||||
|
||||
impl<'src> fmt::Display for Pattern<'src> {
|
||||
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
|
||||
match self {
|
||||
Pattern::Atom(a) => write!(f, "{}", a),
|
||||
Pattern::Word(w) => write!(f, "{}", w),
|
||||
Pattern::Placeholder => write!(f, "_"),
|
||||
Pattern::Tuple(t) => write!(
|
||||
f,
|
||||
"({})",
|
||||
t.iter()
|
||||
.map(|x| x.0.to_string())
|
||||
.collect::<Vec<_>>()
|
||||
.join(", ")
|
||||
),
|
||||
Pattern::List(l) => write!(
|
||||
f,
|
||||
"({})",
|
||||
l.iter()
|
||||
.map(|x| x.0.to_string())
|
||||
.collect::<Vec<_>>()
|
||||
.join(", ")
|
||||
),
|
||||
Pattern::Pair(kw, expr) => write!(f, "{} {}", kw, expr.0),
|
||||
Pattern::Dict(entries) => write!(
|
||||
f,
|
||||
"#{{{}}}",
|
||||
entries
|
||||
.iter()
|
||||
.map(|(pair, _)| pair.to_string())
|
||||
.collect::<Vec<_>>()
|
||||
.join(", ")
|
||||
),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
fn parser<'src, I>(
|
||||
) -> impl Parser<'src, I, Spanned<Ast<'src>>, extra::Err<Rich<'src, Token<'src>, Span>>> + Clone
|
||||
where
|
||||
I: ValueInput<'src, Token = Token<'src>, Span = Span>,
|
||||
{
|
||||
recursive(|expr| {
|
||||
let separators = recursive(|separators| {
|
||||
just(Token::Punctuation(","))
|
||||
.or(just(Token::Punctuation("\n")))
|
||||
.then(separators.clone().repeated())
|
||||
});
|
||||
|
||||
let pattern = recursive(|pattern| {
|
||||
let placeholder = select! {Token::Punctuation("_") => Pattern::Placeholder}
|
||||
.map_with(|p, e| (p, e.span()));
|
||||
|
||||
let word =
|
||||
select! { Token::Word(w) => Pattern::Word(w) }.map_with(|w, e| (w, e.span()));
|
||||
|
||||
let atom = select! {
|
||||
Token::Nil => Pattern::Atom(Value::Nil),
|
||||
Token::Boolean(b) => Pattern::Atom(Value::Boolean(b)),
|
||||
Token::Number(n) => Pattern::Atom(Value::Number(n)),
|
||||
Token::Keyword(k) => Pattern::Atom(Value::Keyword(k)),
|
||||
}
|
||||
.map_with(|a, e| (a, e.span()));
|
||||
|
||||
let tuple = pattern
|
||||
.clone()
|
||||
.separated_by(separators.clone())
|
||||
.allow_leading()
|
||||
.allow_trailing()
|
||||
.collect()
|
||||
.delimited_by(just(Token::Punctuation("(")), just(Token::Punctuation(")")))
|
||||
.map_with(|tuple, e| (Pattern::Tuple(tuple), e.span()));
|
||||
|
||||
let list = pattern
|
||||
.clone()
|
||||
.separated_by(separators.clone())
|
||||
.allow_leading()
|
||||
.allow_trailing()
|
||||
.collect()
|
||||
.delimited_by(just(Token::Punctuation("[")), just(Token::Punctuation("]")))
|
||||
.map_with(|list, e| (Pattern::List(list), e.span()));
|
||||
|
||||
let pair = select! {Token::Keyword(k) => Value::Keyword(k)}
|
||||
.then(pattern.clone())
|
||||
.map_with(|(kw, patt), e| (Pattern::Pair(kw, Box::new(patt)), e.span()));
|
||||
|
||||
let shorthand = select! {Token::Word(w) => w}.map_with(|w, e| {
|
||||
(
|
||||
Pattern::Pair(Value::Keyword(w), Box::new((Pattern::Word(w), e.span()))),
|
||||
e.span(),
|
||||
)
|
||||
});
|
||||
|
||||
let dict = pair
|
||||
.or(shorthand)
|
||||
.separated_by(separators.clone())
|
||||
.allow_leading()
|
||||
.allow_trailing()
|
||||
.collect()
|
||||
.delimited_by(
|
||||
just(Token::Punctuation("#{")),
|
||||
just(Token::Punctuation("}")),
|
||||
)
|
||||
.map_with(|dict, e| (Pattern::Dict(dict), e.span()));
|
||||
|
||||
atom.or(word)
|
||||
.or(placeholder)
|
||||
.or(tuple)
|
||||
.or(list)
|
||||
.or(dict)
|
||||
.labelled("pattern")
|
||||
});
|
||||
|
||||
let placeholder =
|
||||
select! {Token::Punctuation("_") => Ast::Placeholder}.map_with(|p, e| (p, e.span()));
|
||||
|
||||
let word = select! { Token::Word(w) => Ast::Word(w) }
|
||||
.map_with(|w, e| (w, e.span()))
|
||||
.labelled("word");
|
||||
|
||||
let simple = recursive(|simple| {
|
||||
let value = select! {
|
||||
Token::Nil => Ast::Value(Value::Nil),
|
||||
Token::Boolean(b) => Ast::Value(Value::Boolean(b)),
|
||||
Token::Number(n) => Ast::Value(Value::Number(n)),
|
||||
Token::String(s) => Ast::Value(Value::String(s)),
|
||||
}
|
||||
.map_with(|v, e| (v, e.span()));
|
||||
|
||||
let keyword = select! {Token::Keyword(k) => Ast::Value(Value::Keyword(k)),}
|
||||
.map_with(|k, e| (k, e.span()));
|
||||
|
||||
// let word = select! {Token::Word(w) => Ast::Word(w)}.map_with(|w, e| (w, e.span()));
|
||||
|
||||
let tuple = simple
|
||||
.clone()
|
||||
.separated_by(separators.clone())
|
||||
.allow_leading()
|
||||
.allow_trailing()
|
||||
.collect()
|
||||
.delimited_by(just(Token::Punctuation("(")), just(Token::Punctuation(")")))
|
||||
.map_with(|tuple, e| (Ast::Tuple(tuple), e.span()));
|
||||
|
||||
// let placeholder = select! {Token::Punctuation("_") => Ast::Placeholder}
|
||||
// .map_with(|p, e| (p, e.span()));
|
||||
|
||||
let args = simple
|
||||
.clone()
|
||||
.or(placeholder)
|
||||
.separated_by(separators.clone())
|
||||
.allow_leading()
|
||||
.allow_trailing()
|
||||
.collect()
|
||||
.delimited_by(just(Token::Punctuation("(")), just(Token::Punctuation(")")))
|
||||
.map_with(|args, e| (Ast::Arguments(args), e.span()));
|
||||
|
||||
let synth_root = word.clone().or(keyword.clone());
|
||||
|
||||
let synth_term = keyword.clone().or(args);
|
||||
|
||||
let synthetic = synth_root
|
||||
.then(synth_term.clone())
|
||||
.then(synth_term.clone().repeated().collect())
|
||||
.map_with(|((root, first), rest), e| {
|
||||
(
|
||||
Ast::Synthetic(Box::new(root), Box::new(first), rest),
|
||||
e.span(),
|
||||
)
|
||||
});
|
||||
|
||||
let list = simple
|
||||
.clone()
|
||||
.separated_by(separators.clone())
|
||||
.allow_leading()
|
||||
.allow_trailing()
|
||||
.collect()
|
||||
.delimited_by(just(Token::Punctuation("[")), just(Token::Punctuation("]")))
|
||||
.map_with(|list, e| (Ast::List(list), e.span()));
|
||||
|
||||
let pair = select! {Token::Keyword(k) => Value::Keyword(k)}
|
||||
.then(simple.clone())
|
||||
.map_with(|(kw, expr), e| (Ast::Pair(kw, Box::new(expr)), e.span()));
|
||||
|
||||
let shorthand = select! {Token::Word(w) => w}.map_with(|w, e| {
|
||||
(
|
||||
Ast::Pair(Value::Keyword(w), Box::new((Ast::Word(w), e.span()))),
|
||||
e.span(),
|
||||
)
|
||||
});
|
||||
|
||||
let dict = pair
|
||||
.or(shorthand)
|
||||
.separated_by(separators.clone())
|
||||
.allow_leading()
|
||||
.allow_trailing()
|
||||
.collect()
|
||||
.delimited_by(
|
||||
just(Token::Punctuation("#{")),
|
||||
just(Token::Punctuation("}")),
|
||||
)
|
||||
.map_with(|dict, e| (Ast::Dict(dict), e.span()));
|
||||
|
||||
synthetic
|
||||
.or(word)
|
||||
.or(keyword)
|
||||
.or(value)
|
||||
.or(tuple)
|
||||
.or(list)
|
||||
.or(dict)
|
||||
.labelled("simple expression")
|
||||
});
|
||||
|
||||
let terminators = recursive(|terminators| {
|
||||
just(Token::Punctuation("\n"))
|
||||
.or(just(Token::Punctuation(";")))
|
||||
.then(terminators.clone().repeated())
|
||||
.labelled("terminator")
|
||||
});
|
||||
|
||||
let nonbinding = recursive(|nonbinding| {
|
||||
let block = expr
|
||||
.clone()
|
||||
.separated_by(terminators.clone())
|
||||
.allow_leading()
|
||||
.allow_trailing()
|
||||
.collect()
|
||||
.delimited_by(just(Token::Punctuation("{")), just(Token::Punctuation("}")))
|
||||
.map_with(|block, e| (Ast::Block(block), e.span()))
|
||||
.recover_with(via_parser(nested_delimiters(
|
||||
Token::Punctuation("{"),
|
||||
Token::Punctuation("}"),
|
||||
[
|
||||
(Token::Punctuation("("), Token::Punctuation(")")),
|
||||
(Token::Punctuation("["), Token::Punctuation("]")),
|
||||
],
|
||||
|span| (Ast::Error, span),
|
||||
)));
|
||||
|
||||
let if_ = just(Token::Reserved("if"))
|
||||
.ignore_then(simple.clone())
|
||||
.then_ignore(just(Token::Reserved("then")))
|
||||
.then(expr.clone())
|
||||
.then_ignore(just(Token::Reserved("else")))
|
||||
.then(expr.clone())
|
||||
.map_with(|((condition, then_branch), else_branch), e| {
|
||||
(
|
||||
Ast::If(
|
||||
Box::new(condition),
|
||||
Box::new(then_branch),
|
||||
Box::new(else_branch),
|
||||
),
|
||||
e.span(),
|
||||
)
|
||||
});
|
||||
|
||||
let when_clause = simple
|
||||
.clone()
|
||||
.then_ignore(just(Token::Punctuation("->")))
|
||||
.then(expr.clone())
|
||||
.map_with(|(cond, body), e| {
|
||||
(Ast::WhenClause(Box::new(cond), Box::new(body)), e.span())
|
||||
});
|
||||
|
||||
let when = just(Token::Reserved("when"))
|
||||
.ignore_then(
|
||||
when_clause
|
||||
.separated_by(terminators.clone())
|
||||
.allow_trailing()
|
||||
.allow_leading()
|
||||
.collect()
|
||||
.delimited_by(just(Token::Punctuation("{")), just(Token::Punctuation("}"))),
|
||||
)
|
||||
.map_with(|clauses, e| (Ast::When(clauses), e.span()));
|
||||
|
||||
let match_clause = pattern
|
||||
.clone()
|
||||
.then_ignore(just(Token::Punctuation("->")))
|
||||
.then(expr.clone())
|
||||
.map_with(|(patt, body), e| {
|
||||
(Ast::MatchClause(Box::new(patt), Box::new(body)), e.span())
|
||||
});
|
||||
|
||||
let match_ = just(Token::Reserved("match"))
|
||||
.ignore_then(simple.clone())
|
||||
.then_ignore(just(Token::Reserved("with")))
|
||||
.then(
|
||||
match_clause
|
||||
.clone()
|
||||
.separated_by(terminators.clone())
|
||||
.allow_leading()
|
||||
.allow_trailing()
|
||||
.collect()
|
||||
.delimited_by(just(Token::Punctuation("{")), just(Token::Punctuation("}"))),
|
||||
)
|
||||
.map_with(|(expr, clauses), e| (Ast::Match(Box::new(expr), clauses), e.span()));
|
||||
|
||||
let conditional = when.or(if_).or(match_);
|
||||
|
||||
//todo:
|
||||
// * [x] do
|
||||
// * [ ] loop
|
||||
// * [ ] repeat
|
||||
// * [x] panic!
|
||||
|
||||
let panic = just(Token::Reserved("panic!"))
|
||||
.ignore_then(nonbinding.clone())
|
||||
.map_with(|expr, e| (Ast::Panic(Box::new(expr)), e.span()));
|
||||
|
||||
let do_ = just(Token::Reserved("do"))
|
||||
.ignore_then(
|
||||
nonbinding
|
||||
.clone()
|
||||
.separated_by(
|
||||
just(Token::Punctuation(">"))
|
||||
.then(just(Token::Punctuation("\n")).repeated()),
|
||||
)
|
||||
.collect(),
|
||||
)
|
||||
.map_with(|exprs, e| (Ast::Do(exprs), e.span()));
|
||||
|
||||
let repeat = just(Token::Reserved("repeat"))
|
||||
.ignore_then(simple.clone())
|
||||
.then(block.clone())
|
||||
.map_with(|(count, body), e| {
|
||||
(Ast::Repeat(Box::new(count), Box::new(body)), e.span())
|
||||
});
|
||||
|
||||
let tuple_pattern = pattern
|
||||
.clone()
|
||||
.separated_by(separators.clone())
|
||||
.allow_leading()
|
||||
.allow_trailing()
|
||||
.collect()
|
||||
.delimited_by(just(Token::Punctuation("(")), just(Token::Punctuation(")")))
|
||||
.map_with(|tuple, e| (Pattern::Tuple(tuple), e.span()))
|
||||
.labelled("tuple pattern");
|
||||
|
||||
let fn_clause = tuple_pattern
|
||||
.then_ignore(just(Token::Punctuation("->")))
|
||||
.then(nonbinding.clone())
|
||||
.map_with(|(pattern, body), e| {
|
||||
(Ast::FnClause(Box::new(pattern), Box::new(body)), e.span())
|
||||
})
|
||||
.labelled("function clause");
|
||||
|
||||
let lambda = just(Token::Reserved("fn"))
|
||||
.ignore_then(fn_clause)
|
||||
.map_with(|clause, e| (Ast::Fn("anonymous", vec![clause]), e.span()));
|
||||
|
||||
let loop_ = just(Token::Reserved("loop"));
|
||||
|
||||
simple
|
||||
.clone()
|
||||
.or(conditional)
|
||||
.or(block)
|
||||
.or(lambda)
|
||||
.or(panic)
|
||||
.or(do_)
|
||||
.labelled("nonbinding expression")
|
||||
});
|
||||
|
||||
let let_ = just(Token::Reserved("let"))
|
||||
.ignore_then(pattern.clone())
|
||||
.then_ignore(just(Token::Punctuation("=")))
|
||||
.then(nonbinding.clone())
|
||||
.map_with(|(pattern, expression), e| {
|
||||
(Ast::Let(Box::new(pattern), Box::new(expression)), e.span())
|
||||
});
|
||||
|
||||
let box_ = just(Token::Reserved("box"))
|
||||
.ignore_then(word.clone())
|
||||
.then_ignore(just(Token::Punctuation("=")))
|
||||
.then(nonbinding.clone())
|
||||
.map_with(|(word, expr), e| {
|
||||
let name = if let Ast::Word(w) = word.0 {
|
||||
w
|
||||
} else {
|
||||
unreachable!()
|
||||
};
|
||||
(Ast::Box(name, Box::new(expr)), e.span())
|
||||
});
|
||||
|
||||
let fn_decl = just(Token::Reserved("fn"))
|
||||
.ignore_then(word.clone())
|
||||
.map_with(|(word, _), e| {
|
||||
let name = if let Ast::Word(w) = word {
|
||||
w
|
||||
} else {
|
||||
unreachable!()
|
||||
};
|
||||
(Ast::FnDeclaration(name), e.span())
|
||||
});
|
||||
|
||||
let tuple_pattern = pattern
|
||||
.clone()
|
||||
.separated_by(separators.clone())
|
||||
.allow_leading()
|
||||
.allow_trailing()
|
||||
.collect()
|
||||
.delimited_by(just(Token::Punctuation("(")), just(Token::Punctuation(")")))
|
||||
.map_with(|tuple, e| (Pattern::Tuple(tuple), e.span()));
|
||||
|
||||
let fn_clause = tuple_pattern
|
||||
.then_ignore(just(Token::Punctuation("->")))
|
||||
.then(nonbinding.clone())
|
||||
.map_with(|(pattern, body), e| {
|
||||
(Ast::FnClause(Box::new(pattern), Box::new(body)), e.span())
|
||||
});
|
||||
|
||||
let fn_named = just(Token::Reserved("fn"))
|
||||
.ignore_then(word.clone())
|
||||
.then(fn_clause.clone())
|
||||
.map_with(|(word, clause), e| {
|
||||
let name = if let Ast::Word(word) = word.0 {
|
||||
word
|
||||
} else {
|
||||
unreachable!()
|
||||
};
|
||||
(Ast::Fn(name, vec![clause]), e.span())
|
||||
});
|
||||
|
||||
let fn_compound = just(Token::Reserved("fn"))
|
||||
.ignore_then(word.clone())
|
||||
.then(
|
||||
fn_clause
|
||||
.clone()
|
||||
.separated_by(terminators)
|
||||
.allow_leading()
|
||||
.allow_trailing()
|
||||
.collect()
|
||||
.delimited_by(just(Token::Punctuation("{")), just(Token::Punctuation("}"))),
|
||||
)
|
||||
.map_with(|(word, clauses), e| {
|
||||
let name = if let Ast::Word(word) = word.0 {
|
||||
word
|
||||
} else {
|
||||
unreachable!()
|
||||
};
|
||||
(Ast::Fn(name, clauses), e.span())
|
||||
});
|
||||
|
||||
let fn_ = fn_named.or(fn_compound).or(fn_decl);
|
||||
|
||||
let binding = let_.or(box_).or(fn_);
|
||||
|
||||
nonbinding.or(binding)
|
||||
})
|
||||
}
|
||||
|
||||
pub fn main() {
|
||||
let src = "let #{a, :b b} = foo";
|
||||
let (tokens, lex_errs) = lexer().parse(src).into_output_errors();
|
||||
if lex_errs.len() > 0 {
|
||||
println!("{:?}", lex_errs);
|
||||
return ();
|
||||
}
|
||||
let tokens = tokens.unwrap();
|
||||
let to_parse = tokens.clone();
|
||||
for (token, _) in tokens {
|
||||
println!("{}", token)
|
||||
}
|
||||
let (ast, _) = parser()
|
||||
.parse(Stream::from_iter(to_parse).spanned(SimpleSpan::new(0, src.len())))
|
||||
.unwrap();
|
||||
println!("{}", ast);
|
||||
}
|
||||
|
||||
// #[cfg(test)]
|
||||
// mod tests {
|
||||
// use crate::lexer;
|
||||
// use crate::Token;
|
||||
// use chumsky::prelude::*;
|
||||
|
||||
// #[test]
|
||||
// fn it_lexes_positive_ints() {
|
||||
// let (mytoken, _) = lexer().parse("42").unwrap()[0].clone();
|
||||
// assert_eq!(mytoken, Token::Number(42.0))
|
||||
// }
|
||||
|
||||
// #[test]
|
||||
// fn it_lexes_negative_ints() {
|
||||
// let (mytoken, _) = lexer().parse("-42").unwrap()[0].clone();
|
||||
// assert_eq!(mytoken, Token::Number(-42.0))
|
||||
// }
|
||||
|
||||
// #[test]
|
||||
// fn it_lexes_positive_floats() {
|
||||
// let (mytoken, _) = lexer().parse("42.032").unwrap()[0].clone();
|
||||
// assert_eq!(mytoken, Token::Number(42.032))
|
||||
// }
|
||||
|
||||
// #[test]
|
||||
// fn it_lexes_positive_decimals() {
|
||||
// let (mytoken, _) = lexer().parse("0.123").unwrap()[0].clone();
|
||||
// assert_eq!(mytoken, Token::Number(0.123))
|
||||
// }
|
||||
|
||||
// #[test]
|
||||
// fn it_lexes_negative_floats() {
|
||||
// let mytoken = lexer().parse("-42.123").unwrap()[0].clone().0;
|
||||
// assert_eq!(mytoken, Token::Number(-42.123))
|
||||
// }
|
||||
|
||||
// #[test]
|
||||
// fn it_lexes_negative_decimals() {
|
||||
// let mytoken = lexer().parse("-0.123").unwrap()[0].clone().0;
|
||||
// assert_eq!(mytoken, Token::Number(-0.123))
|
||||
// }
|
||||
|
||||
// #[test]
|
||||
// fn it_lexes_bools() {
|
||||
// let tt = lexer().parse("true").unwrap()[0].clone().0;
|
||||
// assert_eq!(tt, Token::Boolean(true));
|
||||
// let ff = lexer().parse("false").unwrap()[0].clone().0;
|
||||
// assert_eq!(ff, Token::Boolean(false))
|
||||
// }
|
||||
|
||||
// #[test]
|
||||
// fn it_lexes_words() {
|
||||
// let mytoken = lexer().parse("foo").unwrap()[0].clone().0;
|
||||
// assert_eq!(mytoken, Token::Word("foo"))
|
||||
// }
|
||||
|
||||
// #[test]
|
||||
// fn it_lexes_keywords() {
|
||||
// let kw = lexer().parse(":foo").unwrap()[0].clone().0;
|
||||
// assert_eq!(kw, Token::Keyword("foo"))
|
||||
// }
|
||||
|
||||
// #[test]
|
||||
// fn it_lexes_strings() {
|
||||
// let s = lexer().parse("\"foo bar baz\"").unwrap()[0].clone().0;
|
||||
// assert_eq!(s, Token::String("foo bar baz"))
|
||||
// }
|
||||
|
||||
// #[test]
|
||||
// fn it_ignores_comments() {
|
||||
// let e = lexer().parse("foo &bar\nbaz").unwrap();
|
||||
// assert_eq!(e[0].0, Token::Word("foo"));
|
||||
// assert_eq!(e[1].0, Token::Punctuation("\n"));
|
||||
// assert_eq!(e[2].0, Token::Word("baz"))
|
||||
// }
|
||||
|
||||
// #[test]
|
||||
// fn it_lexes_multiple_tokens() {
|
||||
// let toks = lexer().parse("foo;bar\nbaz").unwrap();
|
||||
// assert_eq!(toks[0].0, Token::Word("foo"));
|
||||
// assert_eq!(toks[2].0, Token::Word("bar"));
|
||||
// assert_eq!(toks[4].0, Token::Word("baz"))
|
||||
// }
|
||||
|
||||
// #[test]
|
||||
// fn it_lexes_collections() {
|
||||
// let toks = lexer().parse("(1, 2)").unwrap();
|
||||
// assert_eq!(toks[0].0, Token::Punctuation("("));
|
||||
// assert_eq!(toks[1].0, Token::Number(1.0));
|
||||
// assert_eq!(toks[2].0, Token::Punctuation(","));
|
||||
// assert_eq!(toks[3].0, Token::Number(2.0));
|
||||
// assert_eq!(toks[4].0, Token::Punctuation(")"))
|
||||
// }
|
||||
// }
|
||||
Loading…
Reference in New Issue
Block a user