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Encode string prefixes in AST

This commit is contained in:
Greg Shuflin 2021-11-21 01:02:59 -08:00
parent 2ba0fb4869
commit d2b5deb802
7 changed files with 34 additions and 27 deletions
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3
schala-lang/src/ast/mod.rs
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@ -202,8 +202,7 @@ pub struct TypeSingletonName {
pub enum ExpressionKind {
NatLiteral(u64),
FloatLiteral(f64),
//TODO StringLiteral variant needs to support prefixes
StringLiteral(Rc<String>),
StringLiteral { prefix: Option<Rc<String>>, s: Rc<String> },
BoolLiteral(bool),
BinExp(BinOp, Box<Expression>, Box<Expression>),
PrefixExp(PrefixOp, Box<Expression>),

2
schala-lang/src/ast/visitor.rs
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@ -71,7 +71,7 @@ pub fn walk_expression<V: ASTVisitor>(v: &mut V, expr: &Expression) {
if let Recursion::Continue = v.expression(expr) {
match &expr.kind {
NatLiteral(_) | FloatLiteral(_) | StringLiteral(_) | BoolLiteral(_) | Value(_) => (),
NatLiteral(_) | FloatLiteral(_) | StringLiteral { .. } | BoolLiteral(_) | Value(_) => (),
BinExp(_, lhs, rhs) => {
walk_expression(v, lhs);
walk_expression(v, rhs);

2
schala-lang/src/ast/visualize.rs
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@ -47,7 +47,7 @@ fn render_expression(expr: &Expression, indent: usize, buf: &mut String) {
match &expr.kind {
NatLiteral(n) => buf.push_str(&format!("(NatLiteral {})", n)),
FloatLiteral(f) => buf.push_str(&format!("(FloatLiteral {})", f)),
StringLiteral(s) => buf.push_str(&format!("(StringLiteral {})", s)),
StringLiteral { s, prefix } => buf.push_str(&format!("(StringLiteral prefix: {:?} {})", prefix, s)),
BoolLiteral(b) => buf.push_str(&format!("(BoolLiteral {})", b)),
BinExp(binop, lhs, rhs) => {
let new_indent = indent + LEVEL;

11
schala-lang/src/parsing/combinator.rs
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@ -830,11 +830,14 @@ fn list_expr(input: Span) -> ParseResult<ExpressionKind> {
})(input)
}
//TODO need to do something with prefix in the AST
fn string_literal(input: Span) -> ParseResult<ExpressionKind> {
tok(map(pair(opt(identifier), bare_string_literal), |(_maybe_prefix, s)| {
ExpressionKind::StringLiteral(Rc::new(s))
}))(input)
context(
"string-literal",
tok(map(pair(opt(identifier), bare_string_literal), |(prefix, s)| ExpressionKind::StringLiteral {
s: Rc::new(s),
prefix: prefix.map(|s| rc_string(s.fragment())),
})),
)(input)
}
fn bare_string_literal(input: Span) -> ParseResult<String> {

5
schala-lang/src/parsing/peg_parser.rs
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@ -446,9 +446,10 @@ peg::parser! {
}
}
//TODO need to do something with prefix in the AST
rule string_literal() -> ExpressionKind =
prefix:identifier()? s:bare_string_literal(){ ExpressionKind::StringLiteral(Rc::new(s.to_string())) }
prefix:identifier()? s:bare_string_literal(){ ExpressionKind::StringLiteral{ s: Rc::new(s.to_string()),
prefix: prefix.map(rc_string)
} }
rule bare_string_literal() -> &'input str =
"\"" s:$(string_component()*) "\"" { s }

35
schala-lang/src/parsing/test.rs
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@ -17,6 +17,10 @@ fn bx<T>(item: T) -> Box<T> {
Box::new(item)
}
fn strlit(s: &str) -> ExpressionKind {
ExpressionKind::StringLiteral { s: Rc::new(s.to_string()), prefix: None }
}
fn stmt(kind: StatementKind) -> Statement {
Statement { location: Location::default(), id: ItemId::default(), kind }
}
@ -179,9 +183,12 @@ fn basic_literals() {
fn string_literals() {
use ExpressionKind::*;
assert_expr!(r#""""#, expr(StringLiteral(rc(""))));
assert_expr!(r#""hello""#, expr(StringLiteral(rc("hello"))));
assert_expr!(r#"b"some bytestring""#, expr(StringLiteral(rc("some bytestring"))));
assert_expr!(r#""""#, expr(strlit("")));
assert_expr!(r#""hello""#, expr(strlit("hello")));
assert_expr!(
r#"b"some bytestring""#,
expr(StringLiteral { s: rc("some bytestring"), prefix: Some(rc("b")) })
);
//NOTE I'm not 100% sure this case is correct, but I'll deal with it later
//assert_expr!(r#""Do \n \" escapes work\t""#, expr(StringLiteral(rc("Do \n \" escapes work\t"))));
}
@ -296,15 +303,12 @@ fn tuples() {
use ExpressionKind::*;
assert_expr!("()", expr(TupleLiteral(vec![])));
assert_expr!(
r#"("hella", 34)"#,
expr(TupleLiteral(vec![expr(StringLiteral(rc("hella"))), expr(NatLiteral(34))]))
);
assert_expr!(r#"("hella", 34)"#, expr(TupleLiteral(vec![expr(strlit("hella")), expr(NatLiteral(34))])));
assert_expr!(
r#"(1+2, "slough")"#,
expr(TupleLiteral(vec![
binop("+", expr(NatLiteral(1)), expr(NatLiteral(2))),
expr(StringLiteral(rc("slough"))),
expr(strlit("slough")),
]))
);
}
@ -473,7 +477,7 @@ fn lambda_expressions() {
name: rc("String"),
params: vec![]
})),
body: vec![stmt(StatementKind::Expression(expr(StringLiteral(rc("q"))))),].into()
body: vec![stmt(StatementKind::Expression(expr(strlit("q")))),].into()
})
);
}
@ -552,9 +556,8 @@ fn complex_lambdas() {
#[test]
fn reserved_words() {
let err = "0: at line 1, in Verify:\nmodule::item::call()\n^\n\n1: at line 1, in token:\nmodule::item::call()\n^\n\n2: at line 1, in identifier:\nmodule::item::call()\n^\n\n3: at line 1, in token:\nmodule::item::call()\n^\n\n4: at line 1, in primary-expr-no-struct:\nmodule::item::call()\n^\n\n5: at line 1, in primary-expr:\nmodule::item::call()\n^\n\n6: at line 1, in extended-expr:\nmodule::item::call()\n^\n\n7: at line 1, in prefix-expr:\nmodule::item::call()\n^\n\n8: at line 1, in expression-kind:\nmodule::item::call()\n^\n\n9: at line 1, in Parsing-statement:\nmodule::item::call()\n^\n\n10: at line 1, in AST:\nmodule::item::call()\n^\n\n";
assert_fail!("module::item::call()", err);
//TODO assert a good error message for this
assert_fail!("module::item::call()");
assert_expr!("modulek::item", expr(ExpressionKind::Value(qn!(modulek, item))));
}
@ -1278,7 +1281,7 @@ if (45, "panda", false, 2.2) {
expr(
IfExpression {
discriminator: Some(bx(expr(TupleLiteral(vec![
expr(NatLiteral(45)), expr(StringLiteral(rc("panda"))), expr(BoolLiteral(false)), expr(FloatLiteral(2.2))
expr(NatLiteral(45)), expr(strlit("panda")), expr(BoolLiteral(false)), expr(FloatLiteral(2.2))
])))),
body: bx(IfExpressionBody::CondList(vec![
ConditionArm {
@ -1291,7 +1294,7 @@ if (45, "panda", false, 2.2) {
]
)),
guard: None,
body: vec![stmt(StatementKind::Expression(expr(StringLiteral(rc("no")))))].into(),
body: vec![stmt(StatementKind::Expression(expr(strlit("no"))))].into(),
},
ConditionArm {
condition: Condition::Pattern(Pattern::TuplePattern(
@ -1303,12 +1306,12 @@ if (45, "panda", false, 2.2) {
]
)),
guard: None,
body: vec![stmt(StatementKind::Expression(expr(StringLiteral(rc("yes")))))].into(),
body: vec![stmt(StatementKind::Expression(expr(strlit("yes"))))].into(),
},
ConditionArm {
condition: Condition::Pattern(Pattern::Ignored),
guard: None,
body: vec![exst(StringLiteral(rc("maybe")))].into(),
body: vec![exst(strlit("maybe"))].into(),
},
]))
}

3
schala-lang/src/reduced_ir/mod.rs
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@ -126,7 +126,8 @@ impl<'a, 'b> Reducer<'a, 'b> {
match &expr.kind {
NatLiteral(n) => Expression::Literal(Literal::Nat(*n)),
FloatLiteral(f) => Expression::Literal(Literal::Float(*f)),
StringLiteral(s) => Expression::Literal(Literal::StringLit(s.clone())),
//TODO implement handling string literal prefixes
StringLiteral { s, prefix: _ } => Expression::Literal(Literal::StringLit(s.clone())),
BoolLiteral(b) => Expression::Literal(Literal::Bool(*b)),
BinExp(binop, lhs, rhs) => self.binop(binop, lhs, rhs),
PrefixExp(op, arg) => self.prefix(op, arg),