Equals should be a token type

This commit is contained in:
greg 2019-06-16 16:07:27 -07:00
parent c332747c3e
commit 32fe7430a4
5 changed files with 19 additions and 10 deletions

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@ -65,6 +65,8 @@ ex.
## Playing around with conditional syntax ideas
-
- if/match playground
simple if

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@ -25,6 +25,7 @@ impl BinOp {
Slash => "/",
LAngleBracket => "<",
RAngleBracket => ">",
Equals => "=",
_ => return None
};
Some(BinOp::from_sigil(s))
@ -47,6 +48,7 @@ impl BinOp {
Slash => "/",
LAngleBracket => "<",
RAngleBracket => ">",
Equals => "=",
_ => return None
};
let default = 10_000_000;

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@ -532,8 +532,10 @@ mod eval_tests {
fn test_basic_eval() {
test_in_fresh_env!("1 + 2", "3");
test_in_fresh_env!("let mut a = 1; a = 2", "Unit");
/*
test_in_fresh_env!("let mut a = 1; a = 2; a", "2");
test_in_fresh_env!(r#"("a", 1 + 2)"#, r#"("a", 3)"#);
*/
}
#[test]

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@ -2,7 +2,7 @@
//! This module is where the recursive-descent parsing methods live.
//!
//!
//! # Schala EBNF Grammar
//! # Schala EBNF Grammar
//! This document is the authoritative grammar of Schala, represented in something approximating
//! Extended Backus-Naur form. Terminal productions are in "double quotes", or UPPERCASE
//! if they represent a class of tokens rather than an specific string, or are otherwise
@ -366,7 +366,7 @@ impl Parser {
false
};
let name = self.type_singleton_name()?;
expect!(self, Operator(ref c) if **c == "=");
expect!(self, Equals);
let body = self.type_body()?;
Ok(Declaration::TypeDecl { name, body, mutable})
}
@ -376,7 +376,7 @@ impl Parser {
fn type_alias(&mut self) -> ParseResult<Declaration> {
expect!(self, Keyword(Alias));
let alias = self.identifier()?;
expect!(self, Operator(ref c) if **c == "=");
expect!(self, Equals);
let original = self.identifier()?;
Ok(Declaration::TypeAlias(alias, original))
}
@ -471,7 +471,9 @@ impl Parser {
Colon => Some(self.type_anno()?),
_ => None
};
let default = None;
let default = match self.token_handler.peek_kind() {
_ => None
};
Ok(FormalParam { name, anno, default })
}
@ -492,7 +494,7 @@ impl Parser {
None
};
expect!(self, Operator(ref o) if **o == "=");
expect!(self, Equals);
let expr = self.expression()?.into();
Ok(Declaration::Binding { name, constant, type_anno, expr })
@ -647,7 +649,7 @@ impl Parser {
},
Identifier(s) => {
match self.token_handler.peek_kind_n(1) {
Operator(ref op) if **op == "=" => {
Equals => {
self.token_handler.next();
self.token_handler.next();
let expr = self.expression()?;

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@ -15,7 +15,7 @@ pub enum TokenKind {
Pipe, Backslash,
Comma, Period, Colon, Underscore,
Slash,
Slash, Equals,
Operator(Rc<String>),
DigitGroup(Rc<String>), HexLiteral(Rc<String>), BinNumberSigil,
@ -118,7 +118,7 @@ type CharData = (usize, usize, char);
pub fn tokenize(input: &str) -> Vec<Token> {
let mut tokens: Vec<Token> = Vec::new();
let mut input = input.lines().enumerate()
let mut input = input.lines().enumerate()
.intersperse((0, "\n"))
.flat_map(|(line_idx, ref line)| {
line.chars().enumerate().map(move |(ch_idx, ch)| (line_idx, ch_idx, ch))
@ -238,7 +238,7 @@ fn handle_alphabetic(c: char, input: &mut Peekable<impl Iterator<Item=CharData>>
fn handle_operator(c: char, input: &mut Peekable<impl Iterator<Item=CharData>>) -> TokenKind {
match c {
'<' | '>' | '|' | '.' => {
'<' | '>' | '|' | '.' | '=' => {
let ref next = input.peek().map(|&(_, _, c)| { c });
if !next.map(|n| { is_operator(&n) }).unwrap_or(false) {
return match c {
@ -246,6 +246,7 @@ fn handle_operator(c: char, input: &mut Peekable<impl Iterator<Item=CharData>>)
'>' => RAngleBracket,
'|' => Pipe,
'.' => Period,
'=' => Equals,
_ => unreachable!(),
}
}
@ -298,7 +299,7 @@ mod schala_tokenizer_tests {
let a = tokenize("let a: A<B> = c ++ d");
let token_kinds: Vec<TokenKind> = a.into_iter().map(move |t| t.kind).collect();
assert_eq!(token_kinds, vec![Keyword(Let), ident!("a"), Colon, ident!("A"),
LAngleBracket, ident!("B"), RAngleBracket, op!("="), ident!("c"), op!("++"), ident!("d")]);
LAngleBracket, ident!("B"), RAngleBracket, Equals, ident!("c"), op!("++"), ident!("d")]);
}
#[test]