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Add another token type; Add ranges

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This commit is contained in:
Jeff 2024-08-12 10:08:34 -04:00
parent 755fe5d899
commit 0ba54e9717
4 changed files with 223 additions and 17 deletions
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21
dust-lang/src/lexer.rs
View File

@ -174,10 +174,16 @@ impl Lexer {
(Token::Comma, (self.position - 1, self.position))
}
'.' => {
if let Some('.') = self.peek_second_char(source) {
self.position += 2;
(Token::DoubleDot, (self.position - 2, self.position))
} else {
self.position += 1;
(Token::Dot, (self.position - 1, self.position))
}
}
'>' => {
if let Some('=') = self.peek_second_char(source) {
self.position += 2;
@ -484,6 +490,21 @@ impl Display for LexError {
mod tests {
use super::*;
#[test]
fn range() {
let input = "0..42";
assert_eq!(
lex(input),
Ok(vec![
(Token::Integer("0"), (0, 1)),
(Token::DoubleDot, (1, 3)),
(Token::Integer("42"), (3, 5)),
(Token::Eof, (5, 5))
])
);
}
#[test]
fn negate_expression() {
let input = "x = -42; -x";

2
dust-lang/src/lib.rs
View File

@ -23,7 +23,7 @@ pub use identifier::Identifier;
pub use lexer::{lex, LexError, Lexer};
pub use parser::{parse, ParseError, Parser};
pub use r#type::Type;
pub use token::{Token, TokenOwned};
pub use token::{Token, TokenKind, TokenOwned};
pub use value::{Value, ValueError};
pub use vm::{run, Vm, VmError};

53
dust-lang/src/parser.rs
View File

@ -13,7 +13,7 @@ use std::{
use crate::{
AbstractSyntaxTree, BinaryOperator, BuiltInFunction, DustError, Identifier, LexError, Lexer,
Node, Span, Statement, Token, TokenOwned, UnaryOperator, Value,
Node, Span, Statement, Token, TokenKind, TokenOwned, UnaryOperator, Value,
};
/// Parses the input into an abstract syntax tree.
@ -225,14 +225,37 @@ impl<'src> Parser<'src> {
self.next_token()?;
let integer = text
.parse()
.parse::<i64>()
.map_err(|error| ParseError::IntegerError { error, position })?;
if let Token::DoubleDot = self.current.0 {
self.next_token()?;
if let Token::Integer(range_end) = self.current.0 {
self.next_token()?;
let range_end = range_end
.parse::<i64>()
.map_err(|error| ParseError::IntegerError { error, position })?;
Ok(Node::new(
Statement::Constant(Value::range(integer..range_end)),
(position.0, self.current.1 .1),
))
} else {
Err(ParseError::ExpectedToken {
expected: TokenKind::Integer,
actual: self.current.0.to_owned(),
position: (position.0, self.current.1 .1),
})
}
} else {
Ok(Node::new(
Statement::Constant(Value::integer(integer)),
position,
))
}
}
(Token::Identifier(text), position) => {
self.next_token()?;
@ -433,7 +456,7 @@ impl<'src> Parser<'src> {
Ok(Node::new(node.inner, (left_position.0, right_position.1)))
} else {
Err(ParseError::ExpectedToken {
expected: TokenOwned::RightParenthesis,
expected: TokenKind::RightParenthesis,
actual: self.current.0.to_owned(),
position: self.current.1,
})
@ -464,7 +487,7 @@ impl<'src> Parser<'src> {
nodes.push(instruction);
} else {
return Err(ParseError::ExpectedToken {
expected: TokenOwned::RightSquareBrace,
expected: TokenKind::RightSquareBrace,
actual: self.current.0.to_owned(),
position: self.current.1,
});
@ -496,7 +519,7 @@ impl<'src> Parser<'src> {
self.next_token()?;
} else {
return Err(ParseError::ExpectedToken {
expected: TokenOwned::LeftParenthesis,
expected: TokenKind::LeftParenthesis,
actual: self.current.0.to_owned(),
position: self.current.1,
});
@ -523,7 +546,7 @@ impl<'src> Parser<'src> {
}
} else {
return Err(ParseError::ExpectedToken {
expected: TokenOwned::RightParenthesis,
expected: TokenKind::RightParenthesis,
actual: self.current.0.to_owned(),
position: self.current.1,
});
@ -547,7 +570,7 @@ impl<'src> Parser<'src> {
if let Token::LeftCurlyBrace = self.current.0 {
} else {
return Err(ParseError::ExpectedToken {
expected: TokenOwned::LeftCurlyBrace,
expected: TokenKind::LeftCurlyBrace,
actual: self.current.0.to_owned(),
position: self.current.1,
});
@ -707,7 +730,7 @@ impl<'src> Parser<'src> {
self.next_token()?;
} else {
return Err(ParseError::ExpectedToken {
expected: TokenOwned::LeftCurlyBrace,
expected: TokenKind::LeftCurlyBrace,
actual: self.current.0.to_owned(),
position: self.current.1,
});
@ -749,7 +772,7 @@ pub enum ParseError {
position: Span,
},
ExpectedToken {
expected: TokenOwned,
expected: TokenKind,
actual: TokenOwned,
position: Span,
},
@ -822,6 +845,18 @@ mod tests {
use super::*;
#[test]
fn range() {
let input = "0..42";
assert_eq!(
parse(input),
Ok(AbstractSyntaxTree {
nodes: [Node::new(Statement::Constant(Value::range(0..42)), (0, 5))].into()
})
);
}
#[test]
fn negate_variable() {
let input = "a = 1; -a";

152
dust-lang/src/token.rs
View File

@ -32,6 +32,7 @@ pub enum Token<'src> {
Comma,
Dot,
DoubleAmpersand,
DoubleDot,
DoubleEqual,
DoublePipe,
Equal,
@ -62,6 +63,7 @@ impl<'src> Token<'src> {
Token::Comma => TokenOwned::Comma,
Token::Dot => TokenOwned::Dot,
Token::DoubleAmpersand => TokenOwned::DoubleAmpersand,
Token::DoubleDot => TokenOwned::DoubleDot,
Token::DoubleEqual => TokenOwned::DoubleEqual,
Token::DoublePipe => TokenOwned::DoublePipe,
Token::Else => TokenOwned::Else,
@ -110,6 +112,7 @@ impl<'src> Token<'src> {
Token::Comma => ",",
Token::Dot => ".",
Token::DoubleAmpersand => "&&",
Token::DoubleDot => "..",
Token::DoubleEqual => "==",
Token::DoublePipe => "||",
Token::Else => "else",
@ -144,6 +147,51 @@ impl<'src> Token<'src> {
}
}
pub fn kind(&self) -> TokenKind {
match self {
Token::Bang => TokenKind::Bang,
Token::Boolean(_) => TokenKind::Boolean,
Token::Comma => TokenKind::Comma,
Token::Dot => TokenKind::Dot,
Token::DoubleAmpersand => TokenKind::DoubleAmpersand,
Token::DoubleDot => TokenKind::DoubleDot,
Token::DoubleEqual => TokenKind::DoubleEqual,
Token::DoublePipe => TokenKind::DoublePipe,
Token::Else => TokenKind::Else,
Token::Eof => TokenKind::Eof,
Token::Equal => TokenKind::Equal,
Token::Float(_) => TokenKind::Float,
Token::Greater => TokenKind::Greater,
Token::GreaterEqual => TokenKind::GreaterOrEqual,
Token::Identifier(_) => TokenKind::Identifier,
Token::If => TokenKind::If,
Token::Integer(_) => TokenKind::Integer,
Token::IsEven => TokenKind::IsEven,
Token::IsOdd => TokenKind::IsOdd,
Token::LeftCurlyBrace => TokenKind::LeftCurlyBrace,
Token::LeftParenthesis => TokenKind::LeftParenthesis,
Token::LeftSquareBrace => TokenKind::LeftSquareBrace,
Token::Length => TokenKind::Length,
Token::Less => TokenKind::Less,
Token::LessEqual => TokenKind::LessOrEqual,
Token::Minus => TokenKind::Minus,
Token::Percent => TokenKind::Percent,
Token::Plus => TokenKind::Plus,
Token::PlusEqual => TokenKind::PlusEqual,
Token::ReadLine => TokenKind::ReadLine,
Token::RightCurlyBrace => TokenKind::RightCurlyBrace,
Token::RightParenthesis => TokenKind::RightParenthesis,
Token::RightSquareBrace => TokenKind::RightSquareBrace,
Token::Semicolon => TokenKind::Semicolon,
Token::Star => TokenKind::Star,
Token::Slash => TokenKind::Slash,
Token::String(_) => TokenKind::String,
Token::ToString => TokenKind::ToString,
Token::While => TokenKind::While,
Token::WriteLine => TokenKind::WriteLine,
}
}
pub fn is_eof(&self) -> bool {
matches!(self, Token::Eof)
}
@ -162,7 +210,7 @@ impl<'src> Token<'src> {
Token::DoubleAmpersand => 4,
Token::DoublePipe => 3,
Token::Equal | Token::PlusEqual => 2,
Token::Semicolon => 1,
Token::DoubleDot | Token::Semicolon => 1,
_ => 0,
}
}
@ -198,6 +246,7 @@ impl<'src> PartialEq for Token<'src> {
(Token::Comma, Token::Comma) => true,
(Token::Dot, Token::Dot) => true,
(Token::DoubleAmpersand, Token::DoubleAmpersand) => true,
(Token::DoubleDot, Token::DoubleDot) => true,
(Token::DoubleEqual, Token::DoubleEqual) => true,
(Token::DoublePipe, Token::DoublePipe) => true,
(Token::Else, Token::Else) => true,
@ -267,6 +316,7 @@ pub enum TokenOwned {
Comma,
Dot,
DoubleAmpersand,
DoubleDot,
DoubleEqual,
DoublePipe,
Equal,
@ -297,6 +347,7 @@ impl Display for TokenOwned {
TokenOwned::Comma => Token::Comma.fmt(f),
TokenOwned::Dot => Token::Dot.fmt(f),
TokenOwned::DoubleAmpersand => Token::DoubleAmpersand.fmt(f),
TokenOwned::DoubleDot => Token::DoubleDot.fmt(f),
TokenOwned::DoubleEqual => Token::DoubleEqual.fmt(f),
TokenOwned::DoublePipe => Token::DoublePipe.fmt(f),
TokenOwned::Else => Token::Else.fmt(f),
@ -334,3 +385,102 @@ impl Display for TokenOwned {
}
}
}
/// Token representation that holds no data.
#[derive(Debug, PartialEq, Clone, Serialize, Deserialize)]
pub enum TokenKind {
Eof,
Identifier,
// Hard-coded values
Boolean,
Float,
Integer,
String,
// Keywords
Else,
If,
IsEven,
IsOdd,
Length,
ReadLine,
ToString,
While,
WriteLine,
// Symbols
Bang,
Comma,
Dot,
DoubleAmpersand,
DoubleDot,
DoubleEqual,
DoublePipe,
Equal,
Greater,
GreaterOrEqual,
LeftCurlyBrace,
LeftParenthesis,
LeftSquareBrace,
Less,
LessOrEqual,
Minus,
Percent,
Plus,
PlusEqual,
RightCurlyBrace,
RightParenthesis,
RightSquareBrace,
Semicolon,
Star,
Slash,
}
impl Display for TokenKind {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
match self {
TokenKind::Bang => Token::Bang.fmt(f),
TokenKind::Boolean => write!(f, "boolean"),
TokenKind::Comma => Token::Comma.fmt(f),
TokenKind::Dot => Token::Dot.fmt(f),
TokenKind::DoubleAmpersand => Token::DoubleAmpersand.fmt(f),
TokenKind::DoubleDot => Token::DoubleDot.fmt(f),
TokenKind::DoubleEqual => Token::DoubleEqual.fmt(f),
TokenKind::DoublePipe => Token::DoublePipe.fmt(f),
TokenKind::Else => Token::Else.fmt(f),
TokenKind::Eof => Token::Eof.fmt(f),
TokenKind::Equal => Token::Equal.fmt(f),
TokenKind::Float => write!(f, "float"),
TokenKind::Greater => Token::Greater.fmt(f),
TokenKind::GreaterOrEqual => Token::GreaterEqual.fmt(f),
TokenKind::Identifier => write!(f, "identifier"),
TokenKind::If => Token::If.fmt(f),
TokenKind::Integer => write!(f, "integer"),
TokenKind::IsEven => Token::IsEven.fmt(f),
TokenKind::IsOdd => Token::IsOdd.fmt(f),
TokenKind::LeftCurlyBrace => Token::LeftCurlyBrace.fmt(f),
TokenKind::LeftParenthesis => Token::LeftParenthesis.fmt(f),
TokenKind::LeftSquareBrace => Token::LeftSquareBrace.fmt(f),
TokenKind::Length => Token::Length.fmt(f),
TokenKind::Less => Token::Less.fmt(f),
TokenKind::LessOrEqual => Token::LessEqual.fmt(f),
TokenKind::Minus => Token::Minus.fmt(f),
TokenKind::Percent => Token::Percent.fmt(f),
TokenKind::Plus => Token::Plus.fmt(f),
TokenKind::PlusEqual => Token::PlusEqual.fmt(f),
TokenKind::ReadLine => Token::ReadLine.fmt(f),
TokenKind::RightCurlyBrace => Token::RightCurlyBrace.fmt(f),
TokenKind::RightParenthesis => Token::RightParenthesis.fmt(f),
TokenKind::RightSquareBrace => Token::RightSquareBrace.fmt(f),
TokenKind::Semicolon => Token::Semicolon.fmt(f),
TokenKind::Star => Token::Star.fmt(f),
TokenKind::Slash => Token::Slash.fmt(f),
TokenKind::String => write!(f, "string"),
TokenKind::ToString => Token::ToString.fmt(f),
TokenKind::While => Token::While.fmt(f),
TokenKind::WriteLine => Token::WriteLine.fmt(f),
}
}
}