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roc-grammar.rs
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roc-grammar.rs
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/*
To debug grammar, add `dbg!(&tokens);`, execute with:
```
cargo test --features peg/trace test_fibo -- --nocapture
```
With visualization, see necessary format for temp_trace.txt [here](https://github.com/fasterthanlime/pegviz):
```
cat highlight/temp_trace.txt | pegviz --output ./pegviz.html
```
*/
#[cfg(test)]
mod test_peg_grammar {
use roc_highlight::tokenizer::{tokenize, Token};
type T = Token;
// Inspired by https://ziglang.org/documentation/0.7.1/#Grammar
// license information can be found in the LEGAL_DETAILS file in
// the root directory of this distribution.
// Thank you zig contributors!
peg::parser! {
grammar tokenparser() for [T] {
pub rule module() =
header() module_defs()? indented_end()
pub rule full_expr() =
op_expr()
/ [T::OpenIndent] op_expr() close_or_end()
pub rule op_expr() = pizza_expr()
rule common_expr() =
closure()
/ expect()
/ if_expr()
/ when()
/ backpass()
/ list()
/ record()
/ record_update()
/ parens_around()
/ [T::Number]
/ [T::NumberBase]
/ [T::String]
/ module_var()
/ tag()
/ accessor_function()
/ defs()
/ annotation()
/ [T::LowercaseIdent]
pub rule expr() =
access()
/ apply()
/ common_expr()
pub rule closure() =
[T::LambdaStart] args() [T::Arrow] closure_body()
rule closure_body() =
[T::OpenIndent] full_expr() ([T::CloseIndent] / end_of_file() / &[T::CloseParen])
/ [T::SameIndent]? full_expr()
rule args() =
(arg() [T::Comma])* arg()
rule arg() =
[T::Underscore]
/ ident()
/ record_destructure()
rule tag() =
[T::UppercaseIdent]
rule list() = empty_list()
/ [T::OpenSquare] (expr() [T::Comma])* expr()? [T::Comma]? [T::CloseSquare] { }
rule empty_list() = [T::OpenSquare] [T::CloseSquare]
rule record() =
empty_record()
/ [T::OpenCurly] assigned_fields_i() [T::CloseCurly]
rule assigned_fields() =
(assigned_field() [T::SameIndent]? [T::Comma] [T::SameIndent]?)* [T::SameIndent]? assigned_field()? [T::Comma]?
rule assigned_fields_i() =
[T::OpenIndent] assigned_fields() [T::CloseIndent]
/ [T::SameIndent]? assigned_fields() [T::SameIndent]?
rule assigned_field() =
required_value()
/ [T::LowercaseIdent]
rule required_value() =
[T::LowercaseIdent] [T::Colon] fz()
rule empty_record() = [T::OpenCurly] [T::CloseCurly]
rule record_update() = [T::OpenCurly] expr() [T::Ampersand] assigned_fields_i() [T::CloseCurly]
rule record_type() =
empty_record()
/ [T::OpenCurly] record_field_types_i() [T::CloseCurly]
rule record_type_i() =
[T::OpenIndent] record_type() [T::CloseIndent]?
/ record_type()
rule record_field_types_i() =
[T::OpenIndent] record_field_types() [T::CloseIndent]
/ record_field_types()
rule record_field_types() =
([T::SameIndent]? record_field_type() [T::SameIndent]? [T::Comma])* ([T::SameIndent]? record_field_type() [T::Comma]?)?
rule record_field_type() =
ident() [T::Colon] type_annotation()
pub rule parens_around() = [T::OpenParen] full_expr() [T::CloseParen]
rule if_expr() = [T::KeywordIf] full_expr() [T::KeywordThen] full_expr()
[T::KeywordElse] full_expr()
rule expect() = [T::KeywordExpect] expr()
pub rule backpass() =
single_backpass() ([T::SameIndent] single_backpass())* [T::SameIndent] full_expr()
pub rule single_backpass() =
backpass_pattern() [T::OpBackpassing] full_expr()
rule common_pattern() =
[T::LowercaseIdent]
/ [T::Underscore]
/ module_var()
/ concrete_type()
/ parens_around()
/ tag()
rule backpass_pattern() =
common_pattern()
/ record_destructure()
/ [T::Number]
/ [T::NumberBase]
/ [T::String]
/ list()
// for applies without line breaks between args: Node color rK rV
rule apply_arg_pattern() =
accessor_function()
/ access()
/ record()
/ record_update()
/ closure()
/ common_pattern()
/ [T::Number]
/ [T::NumberBase]
/ [T::String]
/ list()
/ parens_around()
pub rule when_match_pattern() =
record()
/ [T::Number]
/ [T::NumberBase]
/ [T::String]
/ list()
/ parens_around()
/ apply()
/ common_pattern()
// for applies where the arg is on its own line, for example:
// Effect.after
// transform a
rule apply_arg_line_pattern() =
record()
/ closure()
/ apply()
/ common_pattern()
rule apply_start_pattern() =
access()
/ common_pattern()
rule record_destructure() =
empty_record()
/ [T::OpenCurly] (ident() [T::Comma])* ident() [T::Comma]? [T::CloseCurly]
rule access() =
access_start() [T::Dot] ident()
rule access_start() =
[T::LowercaseIdent]
/ record()
/ parens_around()
rule accessor_function() =
[T::SpaceDot] ident()
/ [T::Dot] ident()
pub rule header() =
__ almost_header() header_end()
pub rule almost_header() =
app_header()
/ interface_header()
/ platform_header()
rule app_header() =
[T::KeywordApp] [T::String] [T::OpenIndent]? packages() imports() provides()// check String to be non-empty?
rule interface_header() =
[T::KeywordInterface] module_name() [T::OpenIndent]? exposes() imports()
rule platform_header() =
[T::KeywordPlatform] [T::String] [T::OpenIndent]? requires() exposes() packages() imports() provides() effects()// check String to be nonempty?
rule header_end() =
([T::CloseIndent]
/ &[T::SameIndent])? // & to not consume the SameIndent
rule packages() =
__ [T::KeywordPackages] record()
rule imports() =
__ [T::KeywordImports] imports_list()
rule imports_list() =
empty_list()
/ [T::OpenSquare] (imports_entry() [T::Comma])* imports_entry()? [T::Comma]? [T::CloseSquare]
rule imports_entry() =
([T::LowercaseIdent] [T::Dot])?
module_name()
([T::Dot] exposes_list() )?
rule exposes_list() =
[T::OpenCurly] (exposes_entry() [T::Comma])* exposes_entry()? [T::Comma]? [T::CloseCurly]
rule exposes_entry() =
ident()
rule provides() =
__ [T::KeywordProvides] provides_list() ([T::KeywordTo] provides_to())?
rule provides_to() =
[T::String]
/ ident()
rule provides_list() =
empty_list()
/ [T::OpenSquare] exposed_names() [T::CloseSquare]
rule exposes() =
__ [T::KeywordExposes] [T::OpenSquare] exposed_names() [T::CloseSquare]
rule exposed_names() =
(ident() [T::Comma])* ident()? [T::Comma]?
rule requires() =
[T::KeywordRequires] requires_rigids() [T::OpenCurly] typed_ident() [T::CloseCurly]
rule requires_rigids() =
empty_record()
/ [T::OpenCurly] (requires_rigid() [T::Comma])* requires_rigid() [T::Comma]? [T::CloseCurly]
rule requires_rigid() =
[T::LowercaseIdent] ([T::FatArrow] [T::UppercaseIdent])?
pub rule typed_ident() =
[T::LowercaseIdent] [T::Colon] type_annotation()
pub rule effects() =
__ [T::KeywordEffects] effect_name() record_type_i()
rule effect_name() =
[T::LowercaseIdent] [T::Dot] [T::UppercaseIdent]
rule module_name() =
[T::UppercaseIdent] ([T::Dot] [T::UppercaseIdent])*
rule ident() =
[T::UppercaseIdent]
/ [T::LowercaseIdent]
// content of type_annotation without Colon(:)
pub rule type_annotation() =
function_type()
/ type_annotation_no_fun()
rule type_annotation_no_fun() =
[T::OpenParen] type_annotation_no_fun() [T::CloseParen]
/ [T::OpenIndent] type_annotation_no_fun() close_or_end()
/ tag_union()
/ apply_type()
/ bound_variable()
/ record_type()
/ inferred()
/ wildcard()
// TODO inline type alias
rule type_annotation_paren_fun() =
type_annotation_no_fun()
/ [T::OpenParen] function_type() [T::CloseParen]
rule tag_union() =
empty_list()
/ [T::OpenSquare] tags() [T::CloseSquare] type_variable()?
rule tags() =
[T::OpenIndent] tags_only() [T::CloseIndent]
/ tags_only()
rule tags_only() =
([T::SameIndent]? apply_type() [T::SameIndent]? [T::Comma] [T::SameIndent]? )* ([T::SameIndent]? apply_type() [T::Comma]?)?
rule type_variable() =
[T::Underscore]
/ bound_variable()
rule bound_variable() =
[T::LowercaseIdent]
// The `*` type variable, e.g. in (List *)
rule wildcard() =
[T::Asterisk]
// '_', indicating the compiler should infer the type
rule inferred() =
[T::Underscore]
rule function_type() =
( type_annotation_paren_fun() ([T::Comma] type_annotation_paren_fun())* [T::Arrow])? type_annotation_paren_fun()
pub rule apply_type() =
concrete_type() apply_type_args()?
rule concrete_type() =
[T::UppercaseIdent] ([T::Dot] [T::UppercaseIdent])*
rule apply_type_args() =
apply_type_arg() apply_type_arg()*
rule apply_type_arg() =
type_annotation_no_fun()
/ record_destructure()
rule _() =
([T::SameIndent])?
// the rules below allow us to set assoicativity and precedence
rule unary_op() =
[T::OpMinus]
/ [T::Bang]
rule unary_expr() =
unary_op()* expr()
rule mul_level_op() =
[T::Asterisk]
/ [T::OpSlash]
/ [T::OpDoubleSlash]
/ [T::OpPercent]
rule mul_level_expr() =
unary_expr() (mul_level_op() unary_expr())*
rule add_level_op() =
[T::OpPlus]
/ [T::OpMinus]
rule add_level_expr() =
mul_level_expr() (add_level_op() mul_level_expr())*
rule compare_op() =
[T::OpEquals] // ==
/ [T::OpNotEquals]
/ [T::OpLessThan]
/ [T::OpGreaterThan]
/ [T::OpLessThanOrEq]
/ [T::OpGreaterThanOrEq]
rule compare_expr() =
add_level_expr() (compare_op() add_level_expr())?
rule bool_and_expr() =
compare_expr() ([T::OpAnd] compare_expr())*
rule bool_or_expr() =
bool_and_expr() ([T::OpOr] bool_and_expr())*
rule pizza_expr() =
bool_or_expr() pizza_end()?
rule pizza_end() =
[T::SameIndent]? [T::OpPizza] [T::SameIndent]? bool_or_expr() pizza_end()*
/ [T::SameIndent]? [T::OpPizza] [T::OpenIndent] bool_or_expr() pizza_end()* close_or_end()
/ [T::OpenIndent] [T::OpPizza] [T::SameIndent]? bool_or_expr() pizza_end()* close_or_end()
/ [T::OpenIndent] [T::OpPizza] [T::OpenIndent] bool_or_expr() pizza_end()* close_double_or_end()
rule close_or_end() =
[T::CloseIndent]
/ end_of_file()
rule close_double_or_end() =
[T::CloseIndent] [T::CloseIndent]
/ [T::CloseIndent] end_of_file()
/ end_of_file()
//TODO support right assoicative caret(^), for example: 2^2
pub rule defs() =
def() ([T::SameIndent]? def())* [T::SameIndent]? full_expr()
pub rule def() =
annotated_body()
/ annotation()
/ body()
/ alias()
/ expect()
pub rule module_defs() =
([T::SameIndent]? def())+
rule annotation() =
annotation_pre_colon() [T::Colon] type_annotation()
rule annotation_pre_colon() =
apply()
/ tag()
/ ident()
rule body() =
ident() [T::OpAssignment] [T::OpenIndent] full_expr() ([T::SameIndent]? full_expr())* ([T::CloseIndent] / end_of_file())
/ ident() [T::OpAssignment] full_expr() end_of_file()?
rule annotated_body() =
annotation() [T::SameIndent] body()
rule alias() =
apply_type() [T::Colon] type_annotation()
pub rule when() =
[T::KeywordWhen] expr() [T::KeywordIs] when_branches()
rule when_branches() =
[T::OpenIndent] when_branch() ([T::SameIndent]? when_branch())* close_or_end()
/ when_branch()+
pub rule when_branch() =
when_match_pattern() ([T::Pipe] full_expr())* ([T::KeywordIf] full_expr())? [T::Arrow] when_branch_body()
rule when_branch_body() =
[T::OpenIndent] full_expr() close_or_end()
/ full_expr()
rule var() =
[T::LowercaseIdent]
/ module_var()
rule module_var() =
module_name() [T::Dot] [T::LowercaseIdent]
pub rule apply() =
apply_start_pattern() apply_args()
pub rule apply_args() =
[T::OpenIndent] apply_arg_line_pattern() single_line_apply_args()? ([T::CloseIndent]/indented_end())
/ apply_arg_pattern()+
rule single_line_apply_args() =
[T::SameIndent] apply_arg_line_pattern() ( (single_line_apply_args()*) / indented_end() )
/ ([T::OpenIndent] apply_arg_line_pattern() single_line_apply_args()* ([T::CloseIndent] / indented_end()))
rule apply_expr() =
var()
/ tag()
rule end() =
[T::CloseIndent]
/ &[T::SameIndent] // & to not consume the SameIndent
/ end_of_file()
rule indented_end() =
([T::OpenIndent] / [T::CloseIndent] / [T::SameIndent])* end_of_file()
// for optionalindents
// underscore rules do not require parentheses
rule __() =
(
[T::OpenIndent]
/ [T::CloseIndent]
/ [T::SameIndent]
)?
rule end_of_file() =
![_]
}
}
#[test]
fn test_basic_expr() {
assert_eq!(tokenparser::expr(&[T::OpenSquare, T::CloseSquare]), Ok(()));
assert_eq!(tokenparser::expr(&[T::OpenCurly, T::CloseCurly]), Ok(()));
assert_eq!(
tokenparser::expr(&[T::OpenParen, T::OpenSquare, T::CloseSquare, T::CloseParen]),
Ok(())
);
assert_eq!(tokenparser::expr(&[T::Number]), Ok(()));
assert_eq!(tokenparser::expr(&[T::String]), Ok(()));
assert_eq!(
tokenparser::expr(&[
T::KeywordIf,
T::Number,
T::KeywordThen,
T::Number,
T::KeywordElse,
T::Number
]),
Ok(())
);
assert_eq!(tokenparser::expr(&[T::KeywordExpect, T::Number]), Ok(()));
}
#[test]
fn test_app_header_1() {
let tokens = tokenize(r#"app "test-app" packages {} imports [] provides [] to blah"#);
assert_eq!(tokenparser::header(&tokens), Ok(()));
}
#[test]
fn test_app_header_2() {
let tokens = tokenize(
r#"
app "test-app"
packages { pf: "platform/main.roc" }
imports []
provides [ main ] to pf
"#,
);
assert_eq!(tokenparser::header(&tokens), Ok(()));
}
#[test]
fn test_interface_header() {
let tokens = tokenize(
r#"
interface Foo.Bar.Baz exposes [] imports []"#,
);
assert_eq!(tokenparser::header(&tokens), Ok(()));
}
#[test]
fn test_interface_header_2() {
let tokens = tokenize(
r#"
interface Base64.Encode
exposes [ toBytes ]
imports [ Bytes.Encode.{ Encoder } ]"#,
);
assert_eq!(tokenparser::header(&tokens), Ok(()));
}
#[test]
fn test_platform_header_1() {
let tokens = tokenize(
r#"platform "rtfeldman/blah" requires {} { main : {} } exposes [] packages {} imports [] provides [] effects fx.Blah {}"#,
);
assert_eq!(tokenparser::header(&tokens), Ok(()));
}
#[test]
fn test_platform_header_2() {
let tokens = tokenize(
r#"platform "examples/cli"
requires {}{ main : Task {} [] } # TODO FIXME
exposes []
packages {}
imports [ Task.{ Task } ]
provides [ mainForHost ]
effects fx.Effect
{
getLine : Effect Str,
putLine : Str -> Effect {},
twoArguments : Int, Int -> Effect {}
}"#,
);
assert_eq!(tokenparser::header(&tokens), Ok(()));
}
#[test]
fn test_annotated_def() {
let tokens = tokenize(
r#"test1 : Bool
test1 =
example1 == [ 2, 4 ]"#,
);
assert_eq!(tokenparser::def(&tokens), Ok(()));
}
#[test]
fn test_record_def_1() {
let tokens = tokenize(r#"x = { content: 4 }"#);
assert_eq!(tokenparser::def(&tokens), Ok(()));
}
#[test]
fn test_record_def_2() {
let tokens = tokenize(
r#"x =
{ content: 4 }"#,
);
assert_eq!(tokenparser::def(&tokens), Ok(()));
}
#[test]
fn test_record_def_3() {
let tokens = tokenize(
r#"x =
{
a: 4,
b: 5
}"#,
);
assert_eq!(tokenparser::def(&tokens), Ok(()));
}
#[test]
fn test_record_def_4() {
let tokens = tokenize(
r#"x =
{
a: 4,
b: 5,
c: 6,
}"#,
);
assert_eq!(tokenparser::def(&tokens), Ok(()));
}
#[test]
fn test_record_def_5() {
let tokens = tokenize(
r#"x =
{
a: 4,
}"#,
);
assert_eq!(tokenparser::def(&tokens), Ok(()));
}
#[test]
fn test_record_def_6() {
let tokens = tokenize(
r#"a = {
b: c,
d: {
e: f,
},
}"#,
);
assert_eq!(tokenparser::def(&tokens), Ok(()));
}
#[test]
fn test_typed_ident() {
// main : Task {} []
assert_eq!(
tokenparser::typed_ident(&[
T::LowercaseIdent,
T::Colon,
T::UppercaseIdent,
T::OpenCurly,
T::CloseCurly,
T::OpenSquare,
T::CloseSquare
]),
Ok(())
);
}
#[test]
fn test_order_of_ops() {
// True || False && True || False
assert_eq!(
tokenparser::full_expr(&[
T::UppercaseIdent,
T::OpOr,
T::UppercaseIdent,
T::OpAnd,
T::UppercaseIdent,
T::OpOr,
T::UppercaseIdent
]),
Ok(())
);
}
fn file_to_string(file_path: &str) -> String {
// it's ok to panic in a test
std::fs::read_to_string(file_path).unwrap()
}
fn example_path(sub_path: &str) -> String {
let examples_dir = "../../examples/".to_string();
let file_path = examples_dir + sub_path;
file_to_string(&file_path)
}
fn cli_testing_path(sub_path: &str) -> String {
let examples_dir = "../cli_testing_examples/".to_string();
let file_path = examples_dir + sub_path;
file_to_string(&file_path)
}
#[test]
fn test_hello() {
let tokens = tokenize(&example_path("helloWorld.roc"));
assert_eq!(tokenparser::module(&tokens), Ok(()));
}
#[test]
fn test_fibo() {
let tokens = tokenize(&cli_testing_path("algorithms/fibonacci.roc"));
assert_eq!(tokenparser::module(&tokens), Ok(()));
}
#[test]
fn test_annotation() {
let tokens = tokenize(r#"ConsList a : [ Cons a (ConsList a), Nil ]"#);
assert_eq!(tokenparser::def(&tokens), Ok(()));
}
#[test]
fn test_apply_type() {
let tokens = tokenize(r#"Cons a (ConsList a)"#);
assert_eq!(tokenparser::apply_type(&tokens), Ok(()));
}
#[test]
fn test_apply_expect_fail_1() {
assert!(tokenparser::apply(&[
T::LowercaseIdent,
T::LowercaseIdent,
T::CloseIndent,
T::UppercaseIdent
])
.is_err());
}
#[test]
fn test_apply_expect_fail_2() {
let tokens = tokenize(
r#"eval a
b"#,
);
assert!(tokenparser::apply(&tokens).is_err());
}
#[test]
fn test_when_1() {
let tokens = tokenize(
r#"when list is
Cons _ rest ->
1 + len rest
Nil ->
0"#,
);
assert_eq!(tokenparser::when(&tokens), Ok(()));
}
#[test]
fn test_when_2() {
let tokens = tokenize(
r#"when list is
Nil ->
Cons a
Nil ->
Nil"#,
);
assert_eq!(tokenparser::when(&tokens), Ok(()));
}
#[test]
fn test_when_3() {
let tokens = tokenize(
r#"when list is
Nil -> Cons a
Nil -> Nil"#,
);
assert_eq!(tokenparser::when(&tokens), Ok(()));
}
#[test]
fn test_when_in_defs() {
let tokens = tokenize(
r#"fromBytes = \bytes ->
when bytes is
Ok v -> v
"#,
);
dbg!(&tokens);
assert_eq!(tokenparser::module_defs(&tokens), Ok(()));
}
#[test]
fn test_base64() {
let tokens = tokenize(&cli_testing_path("benchmarks/Base64.roc"));
assert_eq!(tokenparser::module(&tokens), Ok(()));
}
#[test]
fn test_base64_test() {
let tokens = tokenize(&cli_testing_path("benchmarks/TestBase64.roc"));
assert_eq!(tokenparser::module(&tokens), Ok(()));
}
#[test]
fn test_when_branch() {
let tokens = tokenize(r#"Ok path -> path"#);
assert_eq!(tokenparser::when_branch(&tokens), Ok(()));
}
#[test]
fn test_def_in_def() {
let tokens = tokenize(
r#"example =
cost = 1
cost"#,
);
assert_eq!(tokenparser::def(&tokens), Ok(()));
}
#[test]
fn test_backpass_in_def() {
let tokens = tokenize(
r#"main =
lastName <- 4
Stdout.line "Hi!""#,
);
assert_eq!(tokenparser::def(&tokens), Ok(()));
}
#[test]
fn test_astar_test() {
let tokens = tokenize(&cli_testing_path("benchmarks/TestAStar.roc"));
assert_eq!(tokenparser::module(&tokens), Ok(()));
}
#[test]
fn test_cli_echo() {
let tokens = tokenize(&example_path("cli/echo.roc"));
assert_eq!(tokenparser::module(&tokens), Ok(()));
}
#[test]
fn test_pizza_1() {
let tokens = tokenize(
r#"closure = \_ ->
Task.succeed {}
|> Task.map (\_ -> x)"#,
);
assert_eq!(tokenparser::def(&tokens), Ok(()));
}
#[test]
fn test_pizza_one_line() {
let tokens = tokenize(r#"5 |> fun"#);
assert_eq!(tokenparser::op_expr(&tokens), Ok(()));
}
#[test]
fn test_pizza_same_indent_1() {
let tokens = tokenize(
r#"5
|> fun"#,
);
assert_eq!(tokenparser::op_expr(&tokens), Ok(()));
}
#[test]
fn test_pizza_same_indent_2() {
let tokens = tokenize(
r#"5
|>
fun"#,
);
assert_eq!(tokenparser::op_expr(&tokens), Ok(()));
}
#[test]
fn test_pizza_indented_1_a() {
let tokens = tokenize(
r#"5
|> fun"#,
);
assert_eq!(tokenparser::op_expr(&tokens), Ok(()));
}
#[test]
fn test_pizza_indented_1_b() {
let tokens = tokenize(
r#"5
|> fun
"#,
);
assert_eq!(tokenparser::op_expr(&tokens), Ok(()));
}
#[test]
fn test_pizza_indented_2_a() {
let tokens = tokenize(
r#"5
|>
fun"#,
);
assert_eq!(tokenparser::op_expr(&tokens), Ok(()));
}
#[test]
fn test_pizza_indented_2_b() {
let tokens = tokenize(
r#"5
|>
fun
"#,
);
assert_eq!(tokenparser::op_expr(&tokens), Ok(()));
}
#[test]
fn test_pizza_indented_2_c() {
let tokens = tokenize(
r#"5
|>
fun
"#,
);
assert_eq!(tokenparser::op_expr(&tokens), Ok(()));
}
#[test]
fn test_pizza_mixed_indent_1_a() {
let tokens = tokenize(
r#"5
|>
fun"#,
);