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implement binop-assignment (+= etc.)

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This commit is contained in:
Dennis Ranke
2022-05-07 20:30:16 +02:00
parent a52fe53a01
commit 01d64baaab
2 changed files with 90 additions and 42 deletions
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125
src/parser.rs
View File

@@ -318,13 +318,27 @@ fn lexer() -> impl Parser<char, Vec<(Token, Span)>, Error = LexerError> {
Token::Int(value as i32)
});
let op = one_of("+-*/%&^|<=>#")
.repeated()
.at_least(1)
.or(just(':').chain(just('=')))
.or(just('!').chain(just('=')))
.collect::<String>()
.map(Token::Op);
let op = choice((
just("#/"),
just("#%"),
just("<<"),
just(">>"),
just("#>>"),
just("#<"),
just("#>"),
just(">="),
just("<="),
just("=="),
just("!="),
just("#>="),
just("#<="),
just("->"),
just(":="),
))
.map(|s| s.to_string())
.or(one_of("+-*/%&^|<=>").map(|s: char| s.to_string()))
.map(Token::Op)
.boxed();
let ctrl = one_of("(){};,:?!$").map(Token::Ctrl);
@@ -408,11 +422,11 @@ fn parse_string_escapes(s: String) -> String {
match c {
'0'..='9' | 'a'..='f' | 'A'..='F' => {
let mut number = c.to_string();
if let Some('0'..='9' | 'a' ..= 'f' | 'A'..='F') = chars.peek() {
if let Some('0'..='9' | 'a'..='f' | 'A'..='F') = chars.peek() {
number.push(chars.next().unwrap());
}
result.push(u8::from_str_radix(&number, 16).unwrap() as char);
},
}
'n' => result.push('\n'),
'r' => result.push('\r'),
't' => result.push('\t'),
@@ -447,6 +461,28 @@ fn script_parser() -> impl Parser<Token, ast::Script, Error = ScriptError> + Clo
_ => None,
});
let product_op = just(Token::Op("*".to_string()))
.to(ast::BinOp::Mul)
.or(just(Token::Op("/".to_string())).to(ast::BinOp::Div))
.or(just(Token::Op("#/".to_string())).to(ast::BinOp::DivU))
.or(just(Token::Op("%".to_string())).to(ast::BinOp::Rem))
.or(just(Token::Op("#%".to_string())).to(ast::BinOp::RemU))
.boxed();
let sum_op = just(Token::Op("+".to_string()))
.to(ast::BinOp::Add)
.or(just(Token::Op("-".to_string())).to(ast::BinOp::Sub))
.boxed();
let shift_op = just(Token::Op("<<".to_string()))
.to(ast::BinOp::Shl)
.or(just(Token::Op("#>>".to_string())).to(ast::BinOp::ShrU))
.or(just(Token::Op(">>".to_string())).to(ast::BinOp::ShrS))
.boxed();
let bit_op = just(Token::Op("&".to_string()))
.to(ast::BinOp::And)
.or(just(Token::Op("|".to_string())).to(ast::BinOp::Or))
.or(just(Token::Op("^".to_string())).to(ast::BinOp::Xor))
.boxed();
let mut expression_out = None;
let block = recursive(|block| {
let mut block_expression = None;
@@ -723,16 +759,7 @@ fn script_parser() -> impl Parser<Token, ast::Script, Error = ScriptError> + Clo
let op_product = memory_op
.clone()
.then(
just(Token::Op("*".to_string()))
.to(ast::BinOp::Mul)
.or(just(Token::Op("/".to_string())).to(ast::BinOp::Div))
.or(just(Token::Op("#/".to_string())).to(ast::BinOp::DivU))
.or(just(Token::Op("%".to_string())).to(ast::BinOp::Rem))
.or(just(Token::Op("#%".to_string())).to(ast::BinOp::RemU))
.then(memory_op.clone())
.repeated(),
)
.then(product_op.clone().then(memory_op.clone()).repeated())
.foldl(|left, (op, right)| {
let span = (left.span.0, left.span.1.start..right.span.1.end);
ast::Expr::BinOp {
@@ -746,13 +773,7 @@ fn script_parser() -> impl Parser<Token, ast::Script, Error = ScriptError> + Clo
let op_sum = op_product
.clone()
.then(
just(Token::Op("+".to_string()))
.to(ast::BinOp::Add)
.or(just(Token::Op("-".to_string())).to(ast::BinOp::Sub))
.then(op_product.clone())
.repeated(),
)
.then(sum_op.clone().then(op_product.clone()).repeated())
.foldl(|left, (op, right)| {
let span = (left.span.0, left.span.1.start..right.span.1.end);
ast::Expr::BinOp {
@@ -766,14 +787,7 @@ fn script_parser() -> impl Parser<Token, ast::Script, Error = ScriptError> + Clo
let op_shift = op_sum
.clone()
.then(
just(Token::Op("<<".to_string()))
.to(ast::BinOp::Shl)
.or(just(Token::Op("#>>".to_string())).to(ast::BinOp::ShrU))
.or(just(Token::Op(">>".to_string())).to(ast::BinOp::ShrS))
.then(op_sum.clone())
.repeated(),
)
.then(shift_op.clone().then(op_sum.clone()).repeated())
.foldl(|left, (op, right)| {
let span = (left.span.0, left.span.1.start..right.span.1.end);
ast::Expr::BinOp {
@@ -815,14 +829,7 @@ fn script_parser() -> impl Parser<Token, ast::Script, Error = ScriptError> + Clo
let op_bit = op_cmp
.clone()
.then(
just(Token::Op("&".to_string()))
.to(ast::BinOp::And)
.or(just(Token::Op("|".to_string())).to(ast::BinOp::Or))
.or(just(Token::Op("^".to_string())).to(ast::BinOp::Xor))
.then(op_cmp.clone())
.repeated(),
)
.then(bit_op.clone().then(op_cmp.clone()).repeated())
.foldl(|left, (op, right)| {
let span = (left.span.0, left.span.1.start..right.span.1.end);
ast::Expr::BinOp {
@@ -867,11 +874,45 @@ fn script_parser() -> impl Parser<Token, ast::Script, Error = ScriptError> + Clo
.map_with_span(|expr, span| expr.with_span(span))
.boxed();
let assign_op = identifier
.then(
product_op
.clone()
.or(sum_op.clone())
.or(shift_op.clone())
.or(bit_op.clone()),
)
.then_ignore(just(Token::Op("=".to_string())))
.then(expression.clone())
.map_with_span(|((name, op), value), span| {
ast::Expr::Assign {
name: name.clone(),
value: Box::new(
ast::Expr::BinOp {
left: Box::new(
ast::Expr::Variable {
name,
local_id: None,
}
.with_span(span.clone()),
),
right: Box::new(value),
op,
}
.with_span(span.clone()),
),
local_id: None,
}
.with_span(span)
})
.boxed();
block_expression
.clone()
.then(just(Token::Ctrl(';')).or_not())
.map_with_span(|(expr, semi), span| (expr.with_span(span), semi.is_none()))
.or(assign
.or(assign_op)
.or(expression.clone())
.then(just(Token::Ctrl(';')).to(false)))
.repeated()

7
test/xorshift.cwa
View File

@@ -5,4 +5,11 @@ fn xorshift(x: i32) -> i32 {
let lazy x = x ^ (x #>> 17);
let inline x = x ^ (x << 5);
x
}
fn xorshift2(x: i32) -> i32 {
x ^= x << 13;
x ^= x #>> 17;
x ^= x << 5;
x
}