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grammar.js
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const PREC = {
comment: 1,
using_directive: 2,
control: 1,
stable_type_id: 2,
while: 2,
assign: 3,
case: 3,
stable_id: 4,
unit: 4,
ascription: 4,
postfix: 5,
colon_call: 5,
infix: 6,
constructor_app: 7,
prefix: 7,
compound: 7,
call: 8,
field: 8,
macro: 10,
binding: 10,
};
module.exports = grammar({
name: "scala",
extras: $ => [/\s/, $.comment, $.block_comment],
supertypes: $ => [$.expression, $._definition, $._pattern],
externals: $ => [
$._automatic_semicolon,
$._indent,
$._interpolated_string_middle,
$._interpolated_string_end,
$._interpolated_multiline_string_middle,
$._interpolated_multiline_string_end,
$._outdent,
$._simple_multiline_string,
$._simple_string,
"else",
"catch",
"finally",
"extends",
"derives",
"with",
],
inline: $ => [
$._pattern,
$._semicolon,
$._definition,
$._param_type,
$._identifier,
$.literal,
],
// Doc: https://tree-sitter.github.io/tree-sitter/creating-parsers, search "precedences"
// These names can be used in the prec functions to define precedence relative only to other names in the array, rather than globally.
precedences: $ => [
["mod", "soft_id"],
["end", "soft_id"],
["new", "structural_type"],
],
conflicts: $ => [
[$.tuple_type, $.parameter_types],
[$.binding, $._simple_expression],
[$.binding, $._type_identifier],
[$.while_expression, $._simple_expression],
[$.if_expression],
[$.match_expression],
[$._function_constructor, $._type_identifier],
[$._given_constructor, $._type_identifier],
[$.instance_expression],
// In case of: 'extension' _indent '{' 'case' operator_identifier 'if' operator_identifier • '=>' …
// we treat `operator_identifier` as `simple_expression`
[$._simple_expression, $.lambda_expression],
// 'package' package_identifier '{' operator_identifier • ':' …
[$.self_type, $._simple_expression],
// 'package' package_identifier '{' operator_identifier '=>' • 'enum' …
[$.self_type, $.lambda_expression],
// 'class' _class_constructor • _automatic_semicolon …
[$._class_definition],
// 'class' operator_identifier • _automatic_semicolon …
[$._class_constructor],
// 'enum' _class_constructor '{' 'case' operator_identifier _full_enum_def_repeat1 • _automatic_semicolon …
[$._full_enum_def],
// _start_val identifier ',' identifier • ':' …
[$.identifiers, $.val_declaration],
// 'enum' operator_identifier _automatic_semicolon '(' ')' • ':' …
[$.class_parameters],
// 'for' operator_identifier ':' _annotated_type • ':' …
[$._type, $.compound_type],
[$.lambda_expression, $.modifiers],
// 'if' parenthesized_expression • '{' …
[$._if_condition, $._simple_expression],
// _postfix_expression_choice ':' '(' wildcard • ':' …
[$.binding, $._simple_type],
],
word: $ => $._alpha_identifier,
rules: {
// TopStats ::= TopStat {semi TopStat}
compilation_unit: $ =>
seq(
optional($._shebang),
optional(trailingSep1($._semicolon, $._top_level_definition)),
),
_top_level_definition: $ =>
choice(
$.package_clause,
$.package_object,
$._definition,
$._end_marker,
$.expression,
),
_definition: $ =>
choice(
$.given_definition,
$.extension_definition,
$.class_definition,
$.import_declaration,
$.export_declaration,
$.object_definition,
$.enum_definition,
$.trait_definition,
$.val_definition,
$.val_declaration,
$.var_definition,
$.var_declaration,
$.type_definition,
$.function_definition,
$.function_declaration,
),
enum_definition: $ =>
seq(
repeat($.annotation),
"enum",
$._class_constructor,
field("extend", optional($.extends_clause)),
field("derive", optional($.derives_clause)),
field("body", $.enum_body),
),
_enum_block: $ =>
prec.left(
seq(
sep1(
$._semicolon,
choice($.enum_case_definitions, $.expression, $._definition),
),
optional($._semicolon),
),
),
enum_body: $ =>
choice(
prec.left(PREC.control, seq(":", $._indent, $._enum_block, $._outdent)),
seq(
"{",
// TODO: self type
optional($._enum_block),
"}",
),
),
enum_case_definitions: $ =>
seq(
repeat($.annotation),
"case",
choice(commaSep1($.simple_enum_case), $.full_enum_case),
),
simple_enum_case: $ =>
prec.left(
seq(
field("name", $._identifier),
field("extend", optional($.extends_clause)),
),
),
full_enum_case: $ => seq(field("name", $._identifier), $._full_enum_def),
_full_enum_def: $ =>
seq(
field("type_parameters", optional($.type_parameters)),
field("class_parameters", repeat1($.class_parameters)),
field("extend", optional($.extends_clause)),
),
package_clause: $ =>
prec.right(
seq(
"package",
field("name", $.package_identifier),
// This is slightly more permissive than the EBNF in that it allows any
// kind of delcaration inside of the package blocks. As we're more
// concerned with the structure rather than the validity of the program
// we'll allow it.
field("body", optional($.template_body)),
),
),
package_identifier: $ => prec.right(sep1(".", $._identifier)),
package_object: $ => seq("package", "object", $._object_definition),
import_declaration: $ =>
prec.left(seq("import", sep1(",", $._namespace_expression))),
export_declaration: $ =>
prec.left(seq("export", sep1(",", $._namespace_expression))),
_namespace_expression: $ =>
prec.left(
seq(
field("path", sep1(".", $._identifier)),
optional(
seq(
".",
choice(
$.namespace_wildcard,
$.namespace_selectors,
// Only allowed in Scala 3
// ImportExpr ::=
// SimpleRef {‘.’ id} ‘.’ ImportSpec | SimpleRef ‘as’ id
$.as_renamed_identifier,
),
),
),
),
),
namespace_wildcard: $ => prec.left(1, choice("*", "_", "given")),
_namespace_given_by_type: $ => seq("given", $._type),
namespace_selectors: $ =>
seq(
"{",
trailingCommaSep1(
choice(
$._namespace_given_by_type,
$.namespace_wildcard,
$._identifier,
$.arrow_renamed_identifier,
$.as_renamed_identifier,
),
),
"}",
),
// deprecated: Remove when highlight query is updated for Neovim
_import_selectors: $ => alias($.namespace_selectors, $.import_selectors),
arrow_renamed_identifier: $ =>
seq(
field("name", $._identifier),
"=>",
field("alias", choice($._identifier, $.wildcard)),
),
as_renamed_identifier: $ =>
seq(
field("name", $._identifier),
"as",
field("alias", choice($._identifier, $.wildcard)),
),
object_definition: $ =>
seq(
repeat($.annotation),
optional($.modifiers),
optional("case"),
"object",
$._object_definition,
),
_object_definition: $ =>
prec.left(
seq(
field("name", $._identifier),
field("extend", optional($.extends_clause)),
field("derive", optional($.derives_clause)),
field("body", optional($._definition_body)),
),
),
class_definition: $ =>
seq(
repeat($.annotation),
optional($.modifiers),
optional("case"),
"class",
$._class_definition,
),
_class_definition: $ =>
seq(
$._class_constructor,
field("extend", optional($.extends_clause)),
field("derive", optional($.derives_clause)),
field("body", optional($._definition_body)),
),
_definition_body: $ =>
seq(optional($._automatic_semicolon), field("body", $.template_body)),
/**
* ClassConstr ::= [ClsTypeParamClause] [ConstrMods] ClsParamClauses
* ConstrMods ::= {Annotation} [AccessModifier]
*/
_class_constructor: $ =>
seq(
field("name", $._identifier),
field("type_parameters", optional($.type_parameters)),
optional($.annotation),
optional($.access_modifier),
field(
"class_parameters",
repeat(seq(optional($._automatic_semicolon), $.class_parameters)),
),
),
trait_definition: $ =>
prec.left(
seq(
repeat($.annotation),
optional($.modifiers),
"trait",
$._class_definition,
),
),
// The EBNF makes a distinction between function type parameters and other
// type parameters as you can't specify variance on function type
// parameters. This isn't important to the structure of the AST so we don't
// make that distinction.
type_parameters: $ =>
seq("[", trailingCommaSep1($._variant_type_parameter), "]"),
_variant_type_parameter: $ =>
seq(
repeat($.annotation),
choice(
$.covariant_type_parameter,
$.contravariant_type_parameter,
$._type_parameter, // invariant type parameter
$.type_lambda,
),
),
covariant_type_parameter: $ => seq("+", $._type_parameter),
contravariant_type_parameter: $ => seq("-", $._type_parameter),
_type_parameter: $ =>
seq(
field("name", choice($.wildcard, $._identifier)),
field("type_parameters", optional($.type_parameters)),
field("bound", optional($.lower_bound)),
field("bound", optional($.upper_bound)),
field("bound", optional(repeat($.view_bound))),
field("bound", optional(repeat($.context_bound))),
),
upper_bound: $ => seq("<:", field("type", $._type)),
lower_bound: $ => seq(">:", field("type", $._type)),
view_bound: $ => seq("<%", field("type", $._type)),
context_bound: $ => seq(":", field("type", $._type)),
/*
* TemplateBody ::= :<<< [SelfType] TemplateStat {semi TemplateStat} >>>
*/
template_body: $ =>
choice($._indented_template_body, $._braced_template_body),
_indented_template_body: $ =>
prec.left(
PREC.control,
seq(":", $._indent, optional($.self_type), $._block, $._outdent),
),
_braced_template_body: $ =>
prec.left(
PREC.control,
seq(
"{",
optional(choice($._braced_template_body1, $._braced_template_body2)),
"}",
),
),
_braced_template_body1: $ => seq(optional($.self_type), $._block),
_braced_template_body2: $ =>
seq(
choice(
seq($._indent, optional($.self_type)),
seq(optional($.self_type), $._indent),
),
optional($._block),
$._outdent,
),
/*
* WithTemplateBody ::= <<< [SelfType] TemplateStat {semi TemplateStat} >>>
*/
with_template_body: $ =>
prec.left(
PREC.control,
choice(
seq($._indent, optional($.self_type), $._block, $._outdent),
seq("{", optional($._block), "}")),
),
_extension_template_body: $ =>
choice(
prec.left(PREC.control, seq($._indent, $._block, $._outdent)),
seq("{", optional($._block), "}"),
),
_end_marker: $ =>
prec.left(
"end",
seq(
"end",
choice(
"if",
"while",
"for",
"match",
"try",
"new",
"this",
"given",
"extension",
"val",
alias($._identifier, "_end_ident"),
),
),
),
// Dynamic precedences added here to win over $.call_expression
self_type: $ =>
prec.dynamic(
1,
seq($._identifier, optional($._self_type_ascription), "=>"),
),
_self_type_ascription: $ => seq(":", $._type),
annotation: $ =>
prec.right(
seq(
"@",
field("name", $._simple_type),
field("arguments", repeat($.arguments)),
),
),
val_definition: $ =>
seq(
$._start_val,
field("pattern", choice($._pattern, $.identifiers)),
optional(seq(":", field("type", $._type))),
"=",
field("value", $._indentable_expression),
),
val_declaration: $ =>
seq(
$._start_val,
commaSep1(field("name", $._identifier)),
":",
field("type", $._type),
),
_start_val: $ => seq(repeat($.annotation), optional($.modifiers), "val"),
var_declaration: $ =>
seq(
$._start_var,
commaSep1(field("name", $._identifier)),
":",
field("type", $._type),
),
var_definition: $ =>
seq(
$._start_var,
field("pattern", choice($._pattern, $.identifiers)),
optional(seq(":", field("type", $._type))),
"=",
field("value", $._indentable_expression),
),
_start_var: $ => seq(repeat($.annotation), optional($.modifiers), "var"),
type_definition: $ =>
prec.left(
seq(
repeat($.annotation),
optional($.modifiers),
optional($.opaque_modifier),
"type",
$._type_constructor,
optional(seq("=", field("type", $._type))),
),
),
// Created for memory-usage optimization during codegen.
_type_constructor: $ =>
prec.left(
seq(
field("name", $._type_identifier),
field("type_parameters", optional($.type_parameters)),
field("bound", optional($.lower_bound)),
field("bound", optional($.upper_bound)),
),
),
function_definition: $ =>
seq(
$._function_declaration,
choice(
seq("=", field("body", $._indentable_expression)),
field("body", $.block),
),
),
function_declaration: $ => $._function_declaration,
_function_declaration: $ =>
prec.left(
seq(
repeat($.annotation),
optional($.modifiers),
"def",
$._function_constructor,
optional(seq(":", field("return_type", $._type))),
),
),
// Created for memory-usage optimization during codegen.
_function_constructor: $ =>
prec.right(
seq(
field("name", $._identifier),
field("type_parameters", optional($.type_parameters)),
field(
"parameters",
repeat(seq(optional($._automatic_semicolon), $.parameters)),
),
optional($._automatic_semicolon),
),
),
opaque_modifier: $ => prec("mod", "opaque"),
/**
* Extension ::= 'extension' [DefTypeParamClause] {UsingParamClause}
* '(' DefParam ')' {UsingParamClause} ExtMethods
*/
extension_definition: $ =>
prec.left(
seq(
"extension",
field("type_parameters", optional($.type_parameters)),
field("parameters", repeat($.parameters)),
field(
"body",
choice(
$._extension_template_body,
$.function_definition,
$.function_declaration,
),
),
),
),
/**
* GivenDef ::= [GivenSig] (AnnotType ['=' Expr] | StructuralInstance)
* GivenSig ::= [id] [DefTypeParamClause] {UsingParamClause} ':'
*/
given_definition: $ =>
prec.left(
seq(
repeat($.annotation),
optional($.modifiers),
"given",
optional($._given_constructor),
choice(
field("return_type", $._structural_instance),
seq(
field("return_type", $._annotated_type),
optional(seq("=", field("body", $._indentable_expression))),
),
),
),
),
_given_constructor: $ =>
prec.right(
seq(
field("name", optional($._identifier)),
field("type_parameters", optional($.type_parameters)),
field(
"parameters",
repeat(seq(optional($._automatic_semicolon), $.parameters)),
),
optional($._automatic_semicolon),
":",
),
),
/**
* StructuralInstance ::= ConstrApp {'with' ConstrApp} ['with' WithTemplateBody]
*/
_structural_instance: $ =>
prec.left(
PREC.compound,
seq(
$._constructor_application,
"with",
field("body", $.with_template_body),
),
),
/**
* ConstrApp ::= SimpleType1 {Annotation} {ParArgumentExprs}
*
* Note: It would look more elegant if we could make seq(choice(), optional(arguments)),
* but that doesn't seem to work.
*/
_constructor_application: $ =>
prec.left(
PREC.constructor_app,
choice(
$._annotated_type,
$.compound_type,
// In theory structural_type should just be added to simple_type,
// but doing so increases the state of template_body to 4000
$._structural_type,
// This adds _simple_type, but not the above intentionall/y.
seq($._simple_type, field("arguments", $.arguments)),
seq($._annotated_type, field("arguments", $.arguments)),
seq($.compound_type, field("arguments", $.arguments)),
),
),
_constructor_applications: $ =>
prec.left(
choice(
commaSep1($._constructor_application),
sep1("with", $._constructor_application),
),
),
modifiers: $ =>
prec.left(
repeat1(
prec.left(
choice(
"abstract",
"final",
"sealed",
"implicit",
"lazy",
"override",
$.access_modifier,
$.inline_modifier,
$.infix_modifier,
$.open_modifier,
$.transparent_modifier,
),
),
),
),
access_modifier: $ =>
prec.left(
seq(choice("private", "protected"), optional($.access_qualifier)),
),
access_qualifier: $ => seq("[", $._identifier, "]"),
inline_modifier: $ => prec("mod", "inline"),
infix_modifier: $ => prec("mod", "infix"),
open_modifier: $ => prec("mod", "open"),
transparent_modifier: $ => prec("mod", "transparent"),
/**
* InheritClauses ::= ['extends' ConstrApps] ['derives' QualId {',' QualId}]
*/
extends_clause: $ =>
prec.left(
seq(
"extends",
field("type", $._constructor_applications),
optional($.arguments),
),
),
derives_clause: $ =>
prec.left(
seq(
"derives",
commaSep1(
field("type", choice($._type_identifier, $.stable_type_identifier)),
),
),
),
class_parameters: $ =>
prec(
1,
seq(
optional($._automatic_semicolon),
"(",
optional(choice("implicit", "using")),
trailingCommaSep($.class_parameter),
")",
),
),
/*
* DefParamClauses ::= {DefParamClause} [[nl] ‘(’ [‘implicit’] DefParams ‘)’]
* DefParamClause ::= [nl] ‘(’ DefParams ‘)’ | UsingParamClause
* DefParams ::= DefParam {‘,’ DefParam}
*/
parameters: $ =>
choice(
seq("(", optional("implicit"), trailingCommaSep($.parameter), ")"),
$._using_parameters_clause,
),
/*
* UsingParamClause ::= [nl] ‘(’ ‘using’ (DefParams | FunArgTypes) ‘)’
* DefParams ::= DefParam {‘,’ DefParam}
* FunArgTypes ::= FunArgType { ‘,’ FunArgType }
*/
_using_parameters_clause: $ =>
seq(
"(",
"using",
choice(
trailingCommaSep1($.parameter),
trailingCommaSep1($._param_type),
),
")",
),
class_parameter: $ =>
seq(
repeat($.annotation),
optional($.modifiers),
optional(choice("val", "var")),
field("name", $._identifier),
optional(seq(":", field("type", $._param_type))),
optional(seq("=", field("default_value", $.expression))),
),
/*
* DefParam ::= {Annotation} [‘inline’] Param
* Param ::= id ‘:’ ParamType [‘=’ Expr]
*/
parameter: $ =>
prec.left(
PREC.control,
seq(
repeat($.annotation),
optional($.inline_modifier),
field("name", $._identifier),
":",
field("type", $._param_type),
optional(seq("=", field("default_value", $.expression))),
),
),
_block: $ =>
prec.left(
seq(
sep1(
$._semicolon,
choice($.expression, $._definition, $._end_marker, ";"),
),
optional($._semicolon),
),
),
_indentable_expression: $ =>
prec.right(choice($.indented_block, $.indented_cases, $.expression)),
block: $ => seq("{", optional($._block), "}"),
indented_block: $ =>
prec.left(
PREC.control,
seq($._indent, $._block, $._outdent, optional($._end_marker)),
),
indented_cases: $ =>
prec.left(seq($._indent, repeat1($.case_clause), $._outdent)),
_indented_type_cases: $ =>
prec.left(seq($._indent, repeat1($.type_case_clause), $._outdent)),
// ---------------------------------------------------------------
// Types
_type: $ =>
choice(
$.function_type,
$.compound_type,
$.infix_type,
$.match_type,
$._annotated_type,
$.literal_type,
$._structural_type,
$.type_lambda,
),
_annotated_type: $ => prec.right(choice($.annotated_type, $._simple_type)),
annotated_type: $ => prec.right(seq($._simple_type, repeat1($.annotation))),
_simple_type: $ =>
choice(
$.generic_type,
$.projected_type,
$.tuple_type,
$.singleton_type,
$.stable_type_identifier,
$._type_identifier,
$.wildcard,
),
compound_type: $ =>
choice(
prec.left(
PREC.compound,
seq(
field("base", $._annotated_type),
repeat1(seq("with", field("extra", $._annotated_type))),
),
),
prec.left(seq(field("base", $._annotated_type), $._refinement)),
prec.left(
-1,
seq(
prec.left(
PREC.compound,
seq(
field("base", $._annotated_type),
repeat1(seq("with", field("extra", $._annotated_type))),
),
),
$._refinement,
),
),
),
_structural_type: $ =>
prec("structural_type", alias($.template_body, $.structural_type)),
_refinement: $ => alias($.template_body, $.refinement),
// This does not include _simple_type since _annotated_type covers it.
_infix_type_choice: $ =>
prec.left(
PREC.infix,
choice(
$.compound_type,
$.infix_type,
$._annotated_type,
$.literal_type,
),
),
infix_type: $ =>
prec.left(
PREC.infix,
seq(
field("left", $._infix_type_choice),
field("operator", $._identifier),
field("right", $._infix_type_choice),
),
),
tuple_type: $ => seq("(", trailingCommaSep1($._type), ")"),
singleton_type: $ =>
prec.left(
PREC.stable_type_id,
seq(choice($._identifier, $.stable_identifier), ".", "type"),
),
stable_type_identifier: $ =>
prec.left(
PREC.stable_type_id,
seq(
choice($._identifier, $.stable_identifier),
".",
$._type_identifier,
),
),
stable_identifier: $ =>
prec.left(
PREC.stable_id,
seq(choice($._identifier, $.stable_identifier), ".", $._identifier),
),
generic_type: $ =>
seq(
field("type", $._simple_type),
field("type_arguments", $.type_arguments),
),
projected_type: $ =>
seq(
field("type", $._simple_type),
"#",
field("selector", $._type_identifier),
),
match_type: $ =>
prec.left(seq($._infix_type_choice, "match", $._indented_type_cases)),
type_case_clause: $ =>
prec.left(
PREC.control,
seq("case", $._infix_type_choice, field("body", $._arrow_then_type)),
),
function_type: $ =>
prec.left(
seq(field("parameter_types", $.parameter_types), $._arrow_then_type),
),
_arrow_then_type: $ =>
prec.right(seq(choice("=>", "?=>"), field("return_type", $._type))),
// Deprioritize against typed_pattern._type.
parameter_types: $ =>
prec(
-1,
choice(
$._annotated_type,
// Prioritize a parenthesized param list over a single tuple_type.
prec.dynamic(1, seq("(", trailingCommaSep($._param_type), ")")),
$.compound_type,
$.infix_type,
),
),
_param_type: $ =>
choice($._type, $.lazy_parameter_type, $.repeated_parameter_type),
lazy_parameter_type: $ => seq("=>", field("type", $._type)),
repeated_parameter_type: $ =>
prec.left(PREC.postfix, seq(field("type", $._type), "*")),
_type_identifier: $ => alias($._identifier, $.type_identifier),
type_lambda: $ =>
seq(
"[",
trailingCommaSep1($._type_parameter),
"]",
"=>>",
field("return_type", $._type),
),
// ---------------------------------------------------------------
// Patterns
_pattern: $ =>
choice(
$._identifier,
$.stable_identifier,
$.interpolated_string_expression,
$.capture_pattern,
$.tuple_pattern,
$.case_class_pattern,
$.infix_pattern,
$.alternative_pattern,
$.typed_pattern,
$.given_pattern,
$.quote_expression,
$.literal,