jeff/dust
1
0
Fork 0
Code

Parse expressions

Browse Source
This commit is contained in:
Jeff 2024-02-24 19:37:04 -05:00
parent bec6eb5aeb
commit 0eb3df9108
2 changed files with 104 additions and 129 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Cargo.toml
View File

@ -14,4 +14,4 @@ opt-level = 3
[dependencies]
ariadne = "0.4.0"
chumsky = "1.0.0-alpha.6"
chumsky = { version = "1.0.0-alpha.6", features = ["pratt"] }

231
src/lib.rs
View File

@ -4,7 +4,7 @@ use std::{
ops::Range,
};
use chumsky::{prelude::*, Parser};
use chumsky::{pratt::*, prelude::*, Parser};
#[derive(Clone, Debug, PartialEq)]
pub enum Statement {
@ -32,22 +32,15 @@ pub enum Expression {
}
#[derive(Clone, Debug, PartialEq)]
pub struct Logic {
left: Expression,
operator: LogicOperator,
right: Expression,
}
#[derive(Clone, Debug, PartialEq)]
pub enum LogicOperator {
Equal,
NotEqual,
Greater,
Less,
GreaterOrEqual,
LessOrEqual,
And,
Or,
pub enum Logic {
Equal(Expression, Expression),
NotEqual(Expression, Expression),
Greater(Expression, Expression),
Less(Expression, Expression),
GreaterOrEqual(Expression, Expression),
LessOrEqual(Expression, Expression),
And(Expression, Expression),
Or(Expression, Expression),
}
#[derive(Clone, Debug, PartialEq)]
@ -84,7 +77,9 @@ impl Display for Value {
}
}
pub fn parser<'src>() -> impl Parser<'src, &'src str, Statement> {
pub fn parser<'src>() -> impl Parser<'src, &'src str, Expression> {
let operator = |text| just(text).padded();
let value = recursive(|value| {
let boolean = just("true")
.or(just("false"))
@ -102,24 +97,22 @@ pub fn parser<'src>() -> impl Parser<'src, &'src str, Statement> {
let float = choice((float_numeric, float_other));
let integer = just('-').or_not().then(text::int(10).padded()).map(
|(negative, integer_text): (Option<char>, &str)| {
let integer = integer_text.parse::<i64>().unwrap();
let integer = just('-')
.or_not()
.then(text::int(10).padded())
.to_slice()
.map(|text: &str| {
let integer = text.parse::<i64>().unwrap();
if negative.is_some() {
Value::Integer(-integer)
} else {
Value::Integer(integer)
}
},
);
Value::Integer(integer)
});
let delimited_string = |delimiter| {
just(delimiter)
.ignore_then(none_of(delimiter).repeated())
.then_ignore(just(delimiter))
.to_slice()
.map(|text: &str| Value::String(text.to_string()))
.map(|text: &str| Value::String(text[1..text.len() - 1].to_string()))
};
let string = choice((
@ -140,52 +133,36 @@ pub fn parser<'src>() -> impl Parser<'src, &'src str, Statement> {
choice((boolean, float, integer, string, list))
});
let expression = recursive(|expression| {
let logic = expression
.clone()
.then(choice((
just("==").to(LogicOperator::Equal),
just("!=").to(LogicOperator::NotEqual),
just(">").to(LogicOperator::Greater),
just("<").to(LogicOperator::Less),
just(">=").to(LogicOperator::GreaterOrEqual),
just("<=").to(LogicOperator::LessOrEqual),
just("&&").to(LogicOperator::And),
just("||").to(LogicOperator::Or),
)))
.padded()
.then(expression)
.map(|((left, operator), right)| {
Expression::Logic(Box::new(Logic {
left,
operator,
right,
}))
});
let value_expression = value.map(|value| Expression::Value(value));
let value = value.map(|value| Expression::Value(value));
let logic_expression = value_expression.pratt((
infix(left(1), operator("=="), |left, right| {
Expression::Logic(Box::new(Logic::Equal(left, right)))
}),
infix(left(1), operator("!="), |left, right| {
Expression::Logic(Box::new(Logic::NotEqual(left, right)))
}),
infix(left(1), operator(">"), |left, right| {
Expression::Logic(Box::new(Logic::Greater(left, right)))
}),
infix(left(1), operator("<"), |left, right| {
Expression::Logic(Box::new(Logic::Less(left, right)))
}),
infix(left(1), operator(">="), |left, right| {
Expression::Logic(Box::new(Logic::GreaterOrEqual(left, right)))
}),
infix(left(1), operator("<="), |left, right| {
Expression::Logic(Box::new(Logic::LessOrEqual(left, right)))
}),
infix(left(1), operator("&&"), |left, right| {
Expression::Logic(Box::new(Logic::And(left, right)))
}),
infix(left(1), operator("||"), |left, right| {
Expression::Logic(Box::new(Logic::Or(left, right)))
}),
));
choice((logic, value))
});
let statement = recursive(|statement| {
let assignment = text::ident()
.map(|text| Identifier::new(text))
.then(just("=").padded())
.then(statement)
.map(|((identifier, _), statement)| {
Statement::Assignment(Box::new(Assignment {
identifier,
statement,
}))
});
let expression = expression.map(|expression| Statement::Expression(expression));
choice((assignment, expression))
});
statement.then_ignore(end())
logic_expression.then_ignore(end())
}
#[cfg(test)]
@ -196,15 +173,15 @@ mod tests {
fn parse_list() {
assert_eq!(
parser().parse("[]").unwrap(),
Statement::value(Value::List(vec![]))
Expression::Value(Value::List(vec![]))
);
assert_eq!(
parser().parse("[42]").unwrap(),
Statement::value(Value::List(vec![Value::Integer(42)]))
Expression::Value(Value::List(vec![Value::Integer(42)]))
);
assert_eq!(
parser().parse("[42, 'foo', \"bar\", [1, 2, 3,]]").unwrap(),
Statement::value(Value::List(vec![
Expression::Value(Value::List(vec![
Value::Integer(42),
Value::String("foo".to_string()),
Value::String("bar".to_string()),
@ -221,7 +198,7 @@ mod tests {
fn parse_true() {
assert_eq!(
parser().parse("true").unwrap(),
Statement::value(Value::Boolean(true))
Expression::Value(Value::Boolean(true))
);
}
@ -229,7 +206,7 @@ mod tests {
fn parse_false() {
assert_eq!(
parser().parse("false").unwrap(),
Statement::value(Value::Boolean(false))
Expression::Value(Value::Boolean(false))
);
}
@ -237,25 +214,25 @@ mod tests {
fn parse_positive_float() {
assert_eq!(
parser().parse("0.0").unwrap(),
Statement::value(Value::Float(0.0))
Expression::Value(Value::Float(0.0))
);
assert_eq!(
parser().parse("42.0").unwrap(),
Statement::value(Value::Float(42.0))
Expression::Value(Value::Float(42.0))
);
let max_float = f64::MAX.to_string() + ".0";
assert_eq!(
parser().parse(&max_float).unwrap(),
Statement::value(Value::Float(f64::MAX))
Expression::Value(Value::Float(f64::MAX))
);
let min_positive_float = f64::MIN_POSITIVE.to_string();
assert_eq!(
parser().parse(&min_positive_float).unwrap(),
Statement::value(Value::Float(f64::MIN_POSITIVE))
Expression::Value(Value::Float(f64::MIN_POSITIVE))
);
}
@ -263,25 +240,25 @@ mod tests {
fn parse_negative_float() {
assert_eq!(
parser().parse("-0.0").unwrap(),
Statement::value(Value::Float(-0.0))
Expression::Value(Value::Float(-0.0))
);
assert_eq!(
parser().parse("-42.0").unwrap(),
Statement::value(Value::Float(-42.0))
Expression::Value(Value::Float(-42.0))
);
let min_float = f64::MIN.to_string() + ".0";
assert_eq!(
parser().parse(&min_float).unwrap(),
Statement::value(Value::Float(f64::MIN))
Expression::Value(Value::Float(f64::MIN))
);
let max_negative_float = f64::MIN_POSITIVE.to_string();
let max_negative_float = format!("-{}", f64::MIN_POSITIVE);
assert_eq!(
parser().parse(&max_negative_float).unwrap(),
Statement::value(Value::Float(-f64::MIN_POSITIVE))
Expression::Value(Value::Float(-f64::MIN_POSITIVE))
);
}
@ -289,16 +266,14 @@ mod tests {
fn parse_other_float() {
assert_eq!(
parser().parse("Infinity").unwrap(),
Statement::value(Value::Float(f64::INFINITY))
Expression::Value(Value::Float(f64::INFINITY))
);
assert_eq!(
parser().parse("-Infinity").unwrap(),
Statement::value(Value::Float(f64::NEG_INFINITY))
Expression::Value(Value::Float(f64::NEG_INFINITY))
);
if let Statement::Expression(Expression::Value(Value::Float(float))) =
parser().parse("NaN").unwrap()
{
if let Expression::Value(Value::Float(float)) = parser().parse("NaN").unwrap() {
assert!(float.is_nan())
} else {
panic!("Expected a float.")
@ -309,54 +284,54 @@ mod tests {
fn parse_positive_integer() {
assert_eq!(
parser().parse("0").unwrap(),
Statement::value(Value::Integer(0))
Expression::Value(Value::Integer(0))
);
assert_eq!(
parser().parse("1").unwrap(),
Statement::value(Value::Integer(1))
Expression::Value(Value::Integer(1))
);
assert_eq!(
parser().parse("2").unwrap(),
Statement::value(Value::Integer(2))
Expression::Value(Value::Integer(2))
);
assert_eq!(
parser().parse("3").unwrap(),
Statement::value(Value::Integer(3))
Expression::Value(Value::Integer(3))
);
assert_eq!(
parser().parse("4").unwrap(),
Statement::value(Value::Integer(4))
Expression::Value(Value::Integer(4))
);
assert_eq!(
parser().parse("5").unwrap(),
Statement::value(Value::Integer(5))
Expression::Value(Value::Integer(5))
);
assert_eq!(
parser().parse("6").unwrap(),
Statement::value(Value::Integer(6))
Expression::Value(Value::Integer(6))
);
assert_eq!(
parser().parse("7").unwrap(),
Statement::value(Value::Integer(7))
Expression::Value(Value::Integer(7))
);
assert_eq!(
parser().parse("8").unwrap(),
Statement::value(Value::Integer(8))
Expression::Value(Value::Integer(8))
);
assert_eq!(
parser().parse("9").unwrap(),
Statement::value(Value::Integer(9))
Expression::Value(Value::Integer(9))
);
assert_eq!(
parser().parse("42").unwrap(),
Statement::value(Value::Integer(42))
Expression::Value(Value::Integer(42))
);
let maximum_integer = i64::MAX.to_string();
assert_eq!(
parser().parse(&maximum_integer).unwrap(),
Statement::value(Value::Integer(i64::MAX))
Expression::Value(Value::Integer(i64::MAX))
);
}
@ -364,54 +339,54 @@ mod tests {
fn parse_negative_integer() {
assert_eq!(
parser().parse("-0").unwrap(),
Statement::value(Value::Integer(-0))
Expression::Value(Value::Integer(-0))
);
assert_eq!(
parser().parse("-1").unwrap(),
Statement::value(Value::Integer(-1))
Expression::Value(Value::Integer(-1))
);
assert_eq!(
parser().parse("-2").unwrap(),
Statement::value(Value::Integer(-2))
Expression::Value(Value::Integer(-2))
);
assert_eq!(
parser().parse("-3").unwrap(),
Statement::value(Value::Integer(-3))
Expression::Value(Value::Integer(-3))
);
assert_eq!(
parser().parse("-4").unwrap(),
Statement::value(Value::Integer(-4))
Expression::Value(Value::Integer(-4))
);
assert_eq!(
parser().parse("-5").unwrap(),
Statement::value(Value::Integer(-5))
Expression::Value(Value::Integer(-5))
);
assert_eq!(
parser().parse("-6").unwrap(),
Statement::value(Value::Integer(-6))
Expression::Value(Value::Integer(-6))
);
assert_eq!(
parser().parse("-7").unwrap(),
Statement::value(Value::Integer(-7))
Expression::Value(Value::Integer(-7))
);
assert_eq!(
parser().parse("-8").unwrap(),
Statement::value(Value::Integer(-8))
Expression::Value(Value::Integer(-8))
);
assert_eq!(
parser().parse("-9").unwrap(),
Statement::value(Value::Integer(-9))
Expression::Value(Value::Integer(-9))
);
assert_eq!(
parser().parse("-42").unwrap(),
Statement::value(Value::Integer(-42))
Expression::Value(Value::Integer(-42))
);
let minimum_integer = i64::MIN.to_string();
assert_eq!(
parser().parse(&minimum_integer).unwrap(),
Statement::value(Value::Integer(i64::MIN))
Expression::Value(Value::Integer(i64::MIN))
);
}
@ -419,19 +394,19 @@ mod tests {
fn double_quoted_string() {
assert_eq!(
parser().parse("\"\"").unwrap(),
Statement::value(Value::String("".to_string()))
Expression::Value(Value::String("".to_string()))
);
assert_eq!(
parser().parse("\"1\"").unwrap(),
Statement::value(Value::String("1".to_string()))
Expression::Value(Value::String("1".to_string()))
);
assert_eq!(
parser().parse("\"42\"").unwrap(),
Statement::value(Value::String("42".to_string()))
Expression::Value(Value::String("42".to_string()))
);
assert_eq!(
parser().parse("\"foobar\"").unwrap(),
Statement::value(Value::String("foobar".to_string()))
Expression::Value(Value::String("foobar".to_string()))
);
}
@ -439,19 +414,19 @@ mod tests {
fn single_quoted_string() {
assert_eq!(
parser().parse("''").unwrap(),
Statement::value(Value::String("".to_string()))
Expression::Value(Value::String("".to_string()))
);
assert_eq!(
parser().parse("'1'").unwrap(),
Statement::value(Value::String("1".to_string()))
Expression::Value(Value::String("1".to_string()))
);
assert_eq!(
parser().parse("'42'").unwrap(),
Statement::value(Value::String("42".to_string()))
Expression::Value(Value::String("42".to_string()))
);
assert_eq!(
parser().parse("'foobar'").unwrap(),
Statement::value(Value::String("foobar".to_string()))
Expression::Value(Value::String("foobar".to_string()))
);
}
@ -459,19 +434,19 @@ mod tests {
fn grave_quoted_string() {
assert_eq!(
parser().parse("``").unwrap(),
Statement::value(Value::String("".to_string()))
Expression::Value(Value::String("".to_string()))
);
assert_eq!(
parser().parse("`1`").unwrap(),
Statement::value(Value::String("1".to_string()))
Expression::Value(Value::String("1".to_string()))
);
assert_eq!(
parser().parse("`42`").unwrap(),
Statement::value(Value::String("42".to_string()))
Expression::Value(Value::String("42".to_string()))
);
assert_eq!(
parser().parse("`foobar`").unwrap(),
Statement::value(Value::String("foobar".to_string()))
Expression::Value(Value::String("foobar".to_string()))
);
}
}