Equals should be a token type
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TODO.md
2
TODO.md
@ -65,6 +65,8 @@ ex.
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## Playing around with conditional syntax ideas
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## Playing around with conditional syntax ideas
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-
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- if/match playground
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- if/match playground
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simple if
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simple if
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@ -25,6 +25,7 @@ impl BinOp {
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Slash => "/",
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Slash => "/",
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LAngleBracket => "<",
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LAngleBracket => "<",
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RAngleBracket => ">",
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RAngleBracket => ">",
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Equals => "=",
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_ => return None
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_ => return None
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};
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};
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Some(BinOp::from_sigil(s))
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Some(BinOp::from_sigil(s))
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@ -47,6 +48,7 @@ impl BinOp {
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Slash => "/",
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Slash => "/",
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LAngleBracket => "<",
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LAngleBracket => "<",
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RAngleBracket => ">",
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RAngleBracket => ">",
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Equals => "=",
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_ => return None
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_ => return None
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};
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};
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let default = 10_000_000;
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let default = 10_000_000;
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@ -532,8 +532,10 @@ mod eval_tests {
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fn test_basic_eval() {
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fn test_basic_eval() {
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test_in_fresh_env!("1 + 2", "3");
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test_in_fresh_env!("1 + 2", "3");
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test_in_fresh_env!("let mut a = 1; a = 2", "Unit");
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test_in_fresh_env!("let mut a = 1; a = 2", "Unit");
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/*
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test_in_fresh_env!("let mut a = 1; a = 2; a", "2");
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test_in_fresh_env!("let mut a = 1; a = 2; a", "2");
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test_in_fresh_env!(r#"("a", 1 + 2)"#, r#"("a", 3)"#);
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test_in_fresh_env!(r#"("a", 1 + 2)"#, r#"("a", 3)"#);
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*/
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}
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}
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#[test]
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#[test]
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@ -2,7 +2,7 @@
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//! This module is where the recursive-descent parsing methods live.
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//! This module is where the recursive-descent parsing methods live.
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//!
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//!
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//!
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//!
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//! # Schala EBNF Grammar
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//! # Schala EBNF Grammar
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//! This document is the authoritative grammar of Schala, represented in something approximating
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//! This document is the authoritative grammar of Schala, represented in something approximating
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//! Extended Backus-Naur form. Terminal productions are in "double quotes", or UPPERCASE
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//! Extended Backus-Naur form. Terminal productions are in "double quotes", or UPPERCASE
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//! if they represent a class of tokens rather than an specific string, or are otherwise
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//! if they represent a class of tokens rather than an specific string, or are otherwise
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@ -366,7 +366,7 @@ impl Parser {
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false
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false
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};
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};
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let name = self.type_singleton_name()?;
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let name = self.type_singleton_name()?;
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expect!(self, Operator(ref c) if **c == "=");
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expect!(self, Equals);
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let body = self.type_body()?;
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let body = self.type_body()?;
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Ok(Declaration::TypeDecl { name, body, mutable})
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Ok(Declaration::TypeDecl { name, body, mutable})
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}
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}
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@ -376,7 +376,7 @@ impl Parser {
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fn type_alias(&mut self) -> ParseResult<Declaration> {
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fn type_alias(&mut self) -> ParseResult<Declaration> {
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expect!(self, Keyword(Alias));
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expect!(self, Keyword(Alias));
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let alias = self.identifier()?;
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let alias = self.identifier()?;
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expect!(self, Operator(ref c) if **c == "=");
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expect!(self, Equals);
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let original = self.identifier()?;
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let original = self.identifier()?;
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Ok(Declaration::TypeAlias(alias, original))
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Ok(Declaration::TypeAlias(alias, original))
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}
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}
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@ -471,7 +471,9 @@ impl Parser {
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Colon => Some(self.type_anno()?),
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Colon => Some(self.type_anno()?),
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_ => None
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_ => None
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};
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};
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let default = None;
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let default = match self.token_handler.peek_kind() {
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_ => None
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};
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Ok(FormalParam { name, anno, default })
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Ok(FormalParam { name, anno, default })
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}
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}
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@ -492,7 +494,7 @@ impl Parser {
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None
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None
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};
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};
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expect!(self, Operator(ref o) if **o == "=");
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expect!(self, Equals);
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let expr = self.expression()?.into();
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let expr = self.expression()?.into();
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Ok(Declaration::Binding { name, constant, type_anno, expr })
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Ok(Declaration::Binding { name, constant, type_anno, expr })
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@ -647,7 +649,7 @@ impl Parser {
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},
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},
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Identifier(s) => {
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Identifier(s) => {
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match self.token_handler.peek_kind_n(1) {
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match self.token_handler.peek_kind_n(1) {
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Operator(ref op) if **op == "=" => {
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Equals => {
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self.token_handler.next();
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self.token_handler.next();
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self.token_handler.next();
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self.token_handler.next();
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let expr = self.expression()?;
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let expr = self.expression()?;
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@ -15,7 +15,7 @@ pub enum TokenKind {
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Pipe, Backslash,
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Pipe, Backslash,
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Comma, Period, Colon, Underscore,
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Comma, Period, Colon, Underscore,
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Slash,
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Slash, Equals,
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Operator(Rc<String>),
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Operator(Rc<String>),
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DigitGroup(Rc<String>), HexLiteral(Rc<String>), BinNumberSigil,
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DigitGroup(Rc<String>), HexLiteral(Rc<String>), BinNumberSigil,
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@ -118,7 +118,7 @@ type CharData = (usize, usize, char);
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pub fn tokenize(input: &str) -> Vec<Token> {
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pub fn tokenize(input: &str) -> Vec<Token> {
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let mut tokens: Vec<Token> = Vec::new();
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let mut tokens: Vec<Token> = Vec::new();
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let mut input = input.lines().enumerate()
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let mut input = input.lines().enumerate()
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.intersperse((0, "\n"))
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.intersperse((0, "\n"))
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.flat_map(|(line_idx, ref line)| {
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.flat_map(|(line_idx, ref line)| {
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line.chars().enumerate().map(move |(ch_idx, ch)| (line_idx, ch_idx, ch))
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line.chars().enumerate().map(move |(ch_idx, ch)| (line_idx, ch_idx, ch))
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@ -238,7 +238,7 @@ fn handle_alphabetic(c: char, input: &mut Peekable<impl Iterator<Item=CharData>>
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fn handle_operator(c: char, input: &mut Peekable<impl Iterator<Item=CharData>>) -> TokenKind {
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fn handle_operator(c: char, input: &mut Peekable<impl Iterator<Item=CharData>>) -> TokenKind {
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match c {
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match c {
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'<' | '>' | '|' | '.' => {
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'<' | '>' | '|' | '.' | '=' => {
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let ref next = input.peek().map(|&(_, _, c)| { c });
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let ref next = input.peek().map(|&(_, _, c)| { c });
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if !next.map(|n| { is_operator(&n) }).unwrap_or(false) {
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if !next.map(|n| { is_operator(&n) }).unwrap_or(false) {
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return match c {
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return match c {
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@ -246,6 +246,7 @@ fn handle_operator(c: char, input: &mut Peekable<impl Iterator<Item=CharData>>)
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'>' => RAngleBracket,
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'>' => RAngleBracket,
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'|' => Pipe,
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'|' => Pipe,
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'.' => Period,
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'.' => Period,
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'=' => Equals,
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_ => unreachable!(),
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_ => unreachable!(),
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}
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}
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}
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}
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@ -298,7 +299,7 @@ mod schala_tokenizer_tests {
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let a = tokenize("let a: A<B> = c ++ d");
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let a = tokenize("let a: A<B> = c ++ d");
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let token_kinds: Vec<TokenKind> = a.into_iter().map(move |t| t.kind).collect();
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let token_kinds: Vec<TokenKind> = a.into_iter().map(move |t| t.kind).collect();
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assert_eq!(token_kinds, vec![Keyword(Let), ident!("a"), Colon, ident!("A"),
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assert_eq!(token_kinds, vec![Keyword(Let), ident!("a"), Colon, ident!("A"),
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LAngleBracket, ident!("B"), RAngleBracket, op!("="), ident!("c"), op!("++"), ident!("d")]);
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LAngleBracket, ident!("B"), RAngleBracket, Equals, ident!("c"), op!("++"), ident!("d")]);
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}
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}
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#[test]
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#[test]
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