/// <reference types="tree-sitter-cli/dsl" />
// @ts-check

module.exports = grammar({
  name: "elm",

  conflicts: ($) => [
    [$._case_of_tail2],
    [$.upper_case_qid, $.value_qid],
    [$._more_case_of_branches],
    [$.function_call_expr],
    [$.field_access_expr],
  ],

  externals: ($) => [
    $._virtual_end_decl,
    $._virtual_open_section,
    $._virtual_end_section,
    $.minus_without_trailing_whitespace,
    $.block_comment,
    $.line_comment,
    $.open_quote,
    $.close_quote,
    $.open_quote_multiline,
    $.close_quote_multiline,
    $.glsl_content,
  ],

  extras: ($) => [
    $.block_comment,
    $.line_comment,
    /[\s\uFEFF\u2060\u200B]|\\\r?\n/,
  ],

  word: ($) => $.lower_case_identifier,

  rules: {
    file: ($) =>
      seq(
        optional(
          seq(
            field("moduleDeclaration", $.module_declaration),
            $._virtual_end_decl
          )
        ),
        optional($._import_list),
        optional($._top_decl_list)
      ),

    module_declaration: ($) =>
      prec.left(
        choice(
          seq(
            optional($.port),
            $.module,
            field("name", $.upper_case_qid),
            field("exposing", $.exposing_list)
          ),
          seq(
            $.effect,
            $.module,
            field("name", $.upper_case_qid),
            $.where,
            $.record_expr,
            field("exposing", $.exposing_list)
          )
        )
      ),

    _import_list: ($) => repeat1(seq($.import_clause, $._virtual_end_decl)),
    _top_decl_list: ($) => repeat1(seq($._declaration, $._virtual_end_decl)),

    // MODULE DECLARATION

    exposing_list: ($) =>
      seq(
        $.exposing,
        $.left_parenthesis,
        choice(
          field("doubleDot", $.double_dot),
          commaSep1($._exposed_item, $.comma)
        ),
        $.right_parenthesis
      ),

    _exposed_item: ($) =>
      choice($.exposed_value, $.exposed_type, $.exposed_operator),

    exposed_value: ($) => $.lower_case_identifier,

    exposed_type: ($) =>
      seq($.upper_case_identifier, optional($.exposed_union_constructors)),

    exposed_union_constructors: ($) =>
      seq($.left_parenthesis, $.double_dot, $.right_parenthesis),

    exposed_union_constructor: ($) => $.upper_case_identifier,

    exposed_operator: ($) => $._operator_as_function_inner,

    // WHITESPACE-SENSITIVE RULES

    _upper_case_identifier_without_leading_whitespace: ($) =>
      token.immediate(/[A-Z][a-zA-Z0-9_]*/),

    _lower_case_identifier_without_leading_whitespace: ($) =>
      token.immediate(/[a-z][a-zA-Z0-9_]*/),

    _dot_without_leading_whitespace: ($) => token.immediate("."),

    upper_case_qid: ($) =>
      prec.right(
        seq(
          $.upper_case_identifier,
          repeat(
            seq(
              alias($._dot_without_leading_whitespace, $.dot),
              alias(
                $._upper_case_identifier_without_leading_whitespace,
                $.upper_case_identifier
              )
            )
          )
        )
      ),

    value_qid: ($) =>
      choice(
        $.lower_case_identifier,
        seq(
          $.upper_case_identifier,
          alias($._dot_without_leading_whitespace, $.dot),
          repeat(
            seq(
              alias(
                $._upper_case_identifier_without_leading_whitespace,
                $.upper_case_identifier
              ),
              alias($._dot_without_leading_whitespace, $.dot)
            )
          ),
          alias(
            $._lower_case_identifier_without_leading_whitespace,
            $.lower_case_identifier
          )
        )
      ),

    field_accessor_function_expr: ($) =>
      seq(
        $.dot,
        alias(
          $._lower_case_identifier_without_leading_whitespace,
          $.lower_case_identifier
        )
      ),

    // IMPORT DECLARATION
    import_clause: ($) =>
      seq(
        $.import,
        field("moduleName", $.upper_case_qid),
        field("asClause", optional($.as_clause)),
        field("exposing", optional($.exposing_list))
      ),

    as_clause: ($) => seq($.as, field("name", $.upper_case_identifier)),

    // TOP-LEVEL DECLARATION

    _declaration: ($) =>
      choice(
        $.value_declaration,
        $.type_alias_declaration,
        $.type_declaration,
        $.type_annotation,
        $.port_annotation,
        $.infix_declaration
      ),

    value_declaration: ($) =>
      seq(
        $._internal_value_declaration_left,
        $.eq,
        field("body", $._expression)
      ),

    _internal_value_declaration_left: ($) =>
      choice(
        field("functionDeclarationLeft", $.function_declaration_left),
        field("pattern", $.pattern)
      ),

    function_declaration_left: ($) =>
      prec(
        3,
        seq(
          $.lower_case_identifier,
          field("pattern", repeat($._function_declaration_pattern))
        )
      ),

    _function_declaration_pattern: ($) =>
      choice(
        $.anything_pattern,
        $.lower_pattern,
        $.tuple_pattern,
        $.unit_expr,
        $.list_pattern,
        $.record_pattern,
        $._literal_expr_group,
        $._parenthesized_pattern
      ),

    // TYPE DECLARATIONS AND REFERENCES

    type_declaration: ($) =>
      prec.left(
        seq(
          $.type,
          field("name", $.upper_case_identifier),
          field("typeName", repeat($.lower_type_name)),
          $.eq,
          field("unionVariant", $.union_variant),
          repeat($._more_union_variants)
        )
      ),

    lower_type_name: ($) => $.lower_case_identifier,

    union_variant: ($) =>
      prec.left(
        seq(
          field("name", $.upper_case_identifier),
          repeat($._single_type_expression)
        )
      ),

    _more_union_variants: ($) =>
      seq($.pipe, field("unionVariant", $.union_variant)),

    type_alias_declaration: ($) =>
      seq(
        $.type,
        $.alias,
        field("name", $.upper_case_identifier),
        field("typeVariable", repeat($.lower_type_name)),
        $.eq,
        field("typeExpression", $.type_expression)
      ),

    type_expression: ($) => arrowSep1($._type_expression_inner, $.arrow),

    _type_expression_inner: ($) =>
      choice($.type_ref, $._single_type_expression),

    type_ref: ($) =>
      prec(2, seq($.upper_case_qid, repeat1($._single_type_expression))),

    _single_type_expression: ($) =>
      choice(
        field("part", alias($.type_ref_without_args, $.type_ref)),
        field("part", $.type_variable),
        field("part", $.record_type),
        field("part", $.tuple_type),
        seq(
          $.left_parenthesis,
          field("part", $.type_expression),
          $.right_parenthesis
        )
      ),

    type_ref_without_args: ($) => $.upper_case_qid,

    type_variable: ($) => $.lower_case_identifier,

    record_type: ($) =>
      seq(
        $.left_brace,
        optional(
          seq(
            optional($._record_base),
            commaSep1(field("fieldType", $.field_type), $.comma)
          )
        ),
        $.right_brace
      ),

    field_type: ($) =>
      seq(
        field("name", $.lower_case_identifier),
        $.colon,
        field("typeExpression", $.type_expression)
      ),

    tuple_type: ($) =>
      choice(
        field("unitExpr", $.unit_expr),
        seq(
          $.left_parenthesis,
          field("typeExpression", $.type_expression),
          repeat1(seq($.comma, field("typeExpression", $.type_expression))),
          $.right_parenthesis
        )
      ),

    type_annotation: ($) =>
      seq(
        field("name", $.lower_case_identifier),
        $.colon,
        field("typeExpression", $.type_expression)
      ),

    port_annotation: ($) =>
      seq(
        $.port,
        field("name", $.lower_case_identifier),
        $.colon,
        field("typeExpression", $.type_expression)
      ),

    // EXPRESSIONS

    _expression: ($) => choice($.bin_op_expr, $._call_or_atom),

    bin_op_expr: ($) =>
      field(
        "part",
        prec(
          5,
          seq(
            $._call_or_atom,
            prec.right(repeat1(seq($.operator, $._call_or_atom)))
          )
        )
      ),

    operator: ($) => $.operator_identifier,

    operator_as_function_expr: ($) => $._operator_as_function_inner,

    _operator_as_function_inner: ($) =>
      seq(
        $.left_parenthesis,
        field("operator", $.operator_identifier),
        $.right_parenthesis
      ),

    _call_or_atom: ($) => choice($.function_call_expr, $._atom),

    function_call_expr: ($) =>
      prec.dynamic(
        10,
        seq(
          field("target", $._function_call_target),
          field("arg", repeat1($._atom))
        )
      ),

    _function_call_target: ($) =>
      prec(
        2,
        choice(
          $.field_access_expr,
          $.value_expr,
          $.field_accessor_function_expr,
          $.operator_as_function_expr,
          $.parenthesized_expr
        )
      ),

    _atom: ($) =>
      choice(
        $._literal_expr_group,
        $.negate_expr,
        $.field_access_expr,
        $.value_expr,
        $.field_accessor_function_expr,
        $.operator_as_function_expr,
        $.parenthesized_expr,
        $.unit_expr,
        $.tuple_expr,
        $.list_expr,
        $.record_expr,
        $.if_else_expr,
        $.case_of_expr,
        $.let_in_expr,
        $.anonymous_function_expr,
        $.glsl_code_expr
      ),

    field_access_expr: ($) =>
      prec.left(
        seq(
          field("target", $._field_access_start),
          repeat1($._field_access_segment)
        )
      ),

    _field_access_start: ($) =>
      prec(
        3,
        choice(
          $.field_access_expr,
          choice($.value_expr, $.parenthesized_expr, $.record_expr)
        )
      ),

    _field_access_segment: ($) =>
      prec.left(
        seq(
          alias($._dot_without_leading_whitespace, $.dot),
          alias(
            $._lower_case_identifier_without_leading_whitespace,
            $.lower_case_identifier
          )
        )
      ),

    negate_expr: ($) =>
      seq(
        alias($.minus_without_trailing_whitespace, $.operator_identifier),
        $._atom
      ), // todo disallow whitespace

    parenthesized_expr: ($) =>
      seq(
        $.left_parenthesis,
        field("expression", $._expression),
        $.right_parenthesis
      ),

    _literal_expr_group: ($) =>
      choice(
        $.char_constant_expr,
        $.number_constant_expr,
        $.string_constant_expr
      ),

    char_constant_expr: ($) =>
      seq(
        $.open_char,
        choice(
          alias($.regular_char, $.regular_string_part),
          $.string_escape,
          $.invalid_string_escape
        ),
        $.close_char
      ),

    open_char: ($) => $._char_quote,

    close_char: ($) => $._char_quote,

    number_constant_expr: ($) => $.number_literal,

    string_constant_expr: ($) =>
      choice(
        seq($.open_quote, optional($._string_parts), $.close_quote),
        seq(
          alias($.open_quote_multiline, $.open_quote),
          optional($._string_parts_multiline),
          alias($.close_quote_multiline, $.close_quote)
        )
      ),

    _string_part: ($) =>
      choice($.regular_string_part, $.string_escape, $.invalid_string_escape),

    _string_part_multiline: ($) =>
      choice(
        alias($.regular_string_part_multiline, $.regular_string_part),
        $.string_escape,
        $.invalid_string_escape
      ),

    _string_parts: ($) => repeat1($._string_part),
    _string_parts_multiline: ($) => repeat1($._string_part_multiline),

    anonymous_function_expr: ($) =>
      seq(
        $.backslash,
        field("param", repeat1($.pattern)),
        $.arrow,
        field("expr", $._expression)
      ),

    value_expr: ($) => field("name", choice($.value_qid, $.upper_case_qid)),

    tuple_expr: ($) =>
      seq(
        $.left_parenthesis,
        field("expr", $._expression),
        repeat1(seq($.comma, field("expr", $._expression))),
        $.right_parenthesis
      ),

    unit_expr: ($) => seq($.left_parenthesis, $.right_parenthesis),

    list_expr: ($) =>
      seq(
        $.left_square_bracket,
        optional(commaSep1(field("exprList", $._expression), $.comma)),
        $.right_square_bracket
      ),

    record_expr: ($) =>
      seq($.left_brace, optional($._record_inner), $.right_brace),

    record_base_identifier: ($) => $.lower_case_identifier,

    _record_base: ($) =>
      seq(field("baseRecord", $.record_base_identifier), $.pipe),

    _record_inner: ($) => seq(optional($._record_base), $._record_inner_fields),

    _record_inner_fields: ($) => commaSep1(field("field", $.field), $.comma),

    field: ($) =>
      seq(
        field("name", $.lower_case_identifier),
        $.eq,
        field("expression", $._expression)
      ),

    if_else_expr: ($) =>
      seq(
        $._if,
        $._then,
        repeat(prec.left(seq("else", $._if, $._then))),
        $._else
      ),

    case_of_expr: ($) =>
      seq($.case, field("expr", $._expression), $._case_of_tail),

    _case_of_tail: ($) => seq($.of, $._case_of_tail2),

    _case_of_tail2: ($) =>
      seq(
        $._virtual_open_section,
        field("branch", $.case_of_branch),
        optional($._more_case_of_branches),
        $._virtual_end_section
      ),

    _more_case_of_branches: ($) =>
      prec.dynamic(
        6,
        repeat1(seq($._virtual_end_decl, field("branch", $.case_of_branch)))
      ),

    case_of_branch: ($) =>
      seq(field("pattern", $.pattern), $.arrow, field("expr", $._expression)),

    let_in_expr: ($) => seq($._let, $._in),

    _inner_declaration: ($) =>
      choice(field("valueDeclaration", $.value_declaration), $.type_annotation),

    _more_inner_declarations: ($) =>
      repeat1(seq($._virtual_end_decl, $._inner_declaration)),

    // PATTERNS

    pattern: ($) =>
      seq(
        choice(field("child", $.cons_pattern), $._single_pattern),
        optional($._pattern_as)
      ),

    _pattern_as: ($) => seq($.as, field("patternAs", $.lower_pattern)),

    cons_pattern: ($) =>
      seq(
        field("part", $._single_pattern_cons),
        repeat1(seq("::", field("part", $._single_pattern_cons)))
      ),

    _single_pattern_cons: ($) =>
      choice(
        $._parenthesized_pattern,
        $.anything_pattern,
        $.lower_pattern,
        $.union_pattern,
        $.tuple_pattern,
        $.unit_expr,
        $.list_pattern,
        $.record_pattern,
        $._literal_expr_group
      ),

    _single_pattern: ($) =>
      choice(
        $._parenthesized_single_pattern,
        field("child", $.anything_pattern),
        field("child", $.lower_pattern),
        field("child", $.union_pattern),
        field("child", $.tuple_pattern),
        field("child", $.unit_expr),
        field("child", $.list_pattern),
        field("child", $.record_pattern),
        field("child", $._literal_expr_group)
      ),

    _parenthesized_single_pattern: ($) =>
      seq($.left_parenthesis, field("child", $.pattern), $.right_parenthesis),

    lower_pattern: ($) => $.lower_case_identifier,

    anything_pattern: ($) => $.underscore,

    record_pattern: ($) =>
      seq(
        $.left_brace,
        commaSep1(field("patternList", $.lower_pattern), $.comma),
        $.right_brace
      ),

    list_pattern: ($) =>
      seq(
        $.left_square_bracket,
        optional(commaSep1(field("part", $.pattern), $.comma)),
        $.right_square_bracket
      ),

    union_pattern: ($) =>
      prec.left(
        seq(
          field("constructor", $.upper_case_qid),
          field("argPattern", repeat($._union_argument_pattern))
        )
      ),

    nullary_constructor_argument_pattern: ($) => $.upper_case_qid,

    _union_argument_pattern: ($) =>
      choice(
        $.anything_pattern,
        $.lower_pattern,
        $.tuple_pattern,
        $.nullary_constructor_argument_pattern,
        $.unit_expr,
        $.list_pattern,
        $.record_pattern,
        $._literal_expr_group,
        $._parenthesized_pattern
      ),

    tuple_pattern: ($) =>
      seq(
        $.left_parenthesis,
        field("pattern", $.pattern),
        $.comma,
        commaSep1(field("pattern", $.pattern), $.comma),
        $.right_parenthesis
      ),

    _parenthesized_pattern: ($) =>
      seq($.left_parenthesis, $.pattern, $.right_parenthesis),

    // MISC
    infix_declaration: ($) =>
      seq(
        $.infix,
        field(
          "associativity",
          alias(choice("left", "right", "non"), $.lower_case_identifier)
        ),
        field("precedence", $.number_literal),
        $._operator_as_function_inner,
        $.eq,
        $.value_expr
      ),

    glsl_code_expr: ($) =>
      seq($.glsl_begin, field("content", $.glsl_content), $.glsl_end),

    // Stuff from lexer

    // Should be /\p{Lu}[_\d\p{L}]*/,
    upper_case_identifier: ($) =>
      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    // Should be /\p{Ll}[_\d\p{L}]*/,
    lower_case_identifier: ($) =>
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A7C\U00010A80-\U00010A9C\U00010AC0-\U00010AC7\U00010AC9-\U00010AE4\U00010B00-\U00010B35\U00010B40-\U00010B55\U00010B60-\U00010B72\U00010B80-\U00010B91\U00010C00-\U00010C48\U00010C80-\U00010CB2\U00010CC0-\U00010CF2\U00010D00-\U00010D23\U00010F00-\U00010F1C\U00010F27\U00010F30-\U00010F45\U00010FE0-\U00010FF6\U00011003-\U00011037\U00011083-\U000110AF\U000110D0-\U000110E8\U00011103-\U00011126\U00011144\U00011150-\U00011172\U00011176\U00011183-\U000111B2\U000111C1-\U000111C4\U000111DA\U000111DC\U00011200-\U00011211\U00011213-\U0001122B\U00011280-\U00011286\U00011288\U0001128A-\U0001128D\U0001128F-\U0001129D\U0001129F-\U000112A8\U000112B0-\U000112DE\U00011305-\U0001130C\U0001130F\U00011310\U00011313-\U00011328\U0001132A-\U00011330\U00011332\U00011333\U00011335-\U00011339\U0001133D\U00011350\U0001135D-\U00011361\U00011400-\U00011434\U00011447-\U0001144A\U0001145F\U00011480-\U000114AF\U000114C4\U000114C5\U000114C7\U00011580-\U000115AE\U000115D8-\U000115DB\U00011600-\U0001162F\U00011644\U00011680-\U000116AA\U000116B8\U00011700-\U0001171A\U00011800-\U0001182B\U000118A0-\U000118DF\U000118FF\U000119A0-\U000119A7\U000119AA-\U000119D0\U000119E1\U000119E3\U00011A00\U00011A0B-\U00011A32\U00011A3A\U00011A50\U00011A5C-\U00011A89\U00011A9D\U00011AC0-\U00011AF8\U00011C00-\U00011C08\U00011C0A-\U00011C2E\U00011C40\U00011C72-\U00011C8F\U00011D00-\U00011D06\U00011D08\U00011D09\U00011D0B-\U00011D30\U00011D46\U00011D60-\U00011D65\U00011D67\U00011D68\U00011D6A-\U00011D89\U00011D98\U00011EE0-\U00011EF2\U00012000-\U00012399\U00012480-\U00012543\U00013000-\U0001342E\U00014400-\U00014646\U00016800-\U00016A38\U00016A40-\U00016A5E\U00016AD0-\U00016AED\U00016B00-\U00016B2F\U00016B40-\U00016B43\U00016B63-\U00016B77\U00016B7D-\U00016B8F\U00016E40-\U00016E7F\U00016F00-\U00016F4A\U00016F50\U00016F93-\U00016F9F\U00016FE0\U00016FE1\U00016FE3\U00017000-\U000187F7\U00018800-\U00018AF2\U0001B000-\U0001B11E\U0001B150-\U0001B152\U0001B164-\U0001B167\U0001B170-\U0001B2FB\U0001BC00-\U0001BC6A\U0001BC70-\U0001BC7C\U0001BC80-\U0001BC88\U0001BC90-\U0001BC99\U0001D400-\U0001D454\U0001D456-\U0001D49C\U0001D49E\U0001D49F\U0001D4A2\U0001D4A5\U0001D4A6\U0001D4A9-\U0001D4AC\U0001D4AE-\U0001D4B9\U0001D4BB\U0001D4BD-\U0001D4C3\U0001D4C5-\U0001D505\U0001D507-\U0001D50A\U0001D50D-\U0001D514\U0001D516-\U0001D51C\U0001D51E-\U0001D539\U0001D53B-\U0001D53E\U0001D540-\U0001D544\U0001D546\U0001D54A-\U0001D550\U0001D552-\U0001D6A5\U0001D6A8-\U0001D6C0\U0001D6C2-\U0001D6DA\U0001D6DC-\U0001D6FA\U0001D6FC-\U0001D714\U0001D716-\U0001D734\U0001D736-\U0001D74E\U0001D750-\U0001D76E\U0001D770-\U0001D788\U0001D78A-\U0001D7A8\U0001D7AA-\U0001D7C2\U0001D7C4-\U0001D7CB\U0001E100-\U0001E12C\U0001E137-\U0001E13D\U0001E14E\U0001E2C0-\U0001E2EB\U0001E800-\U0001E8C4\U0001E900-\U0001E943\U0001E94B\U0001EE00-\U0001EE03\U0001EE05-\U0001EE1F\U0001EE21\U0001EE22\U0001EE24\U0001EE27\U0001EE29-\U0001EE32\U0001EE34-\U0001EE37\U0001EE39\U0001EE3B\U0001EE42\U0001EE47\U0001EE49\U0001EE4B\U0001EE4D-\U0001EE4F\U0001EE51\U0001EE52\U0001EE54\U0001EE57\U0001EE59\U0001EE5B\U0001EE5D\U0001EE5F\U0001EE61\U0001EE62\U0001EE64\U0001EE67-\U0001EE6A\U0001EE6C-\U0001EE72\U0001EE74-\U0001EE77\U0001EE79-\U0001EE7C\U0001EE7E\U0001EE80-\U0001EE89\U0001EE8B-\U0001EE9B\U0001EEA1-\U0001EEA3\U0001EEA5-\U0001EEA9\U0001EEAB-\U0001EEBB\U00020000-\U0002A6D6\U0002A700-\U0002B734\U0002B740-\U0002B81D\U0002B820-\U0002CEA1\U0002CEB0-\U0002EBE0\U0002F800-\U0002FA1D]*/,

    number_literal: ($) =>
      choice(/-?[0-9]+(\.[0-9]+)?(e-?[0-9]+)?/, $._hex_literal),

    _hex_literal: ($) => /0x[0-9A-Fa-f]+/,

    regular_char: ($) => /[^\\\n']/,
    regular_string_part: ($) => choice(/[^\\\"\n]+/, /\"/),
    regular_string_part_multiline: ($) => choice(/[^\\\"]+/, /\"\"?/),

    string_escape: ($) => /\\(u\{[0-9A-Fa-f]{4,6}\}|[nrt\"'\\])/,

    invalid_string_escape: ($) => /\\(u\{[^}]*\}|[^nrt\"'\\])/,

    module: ($) => "module",
    effect: ($) => "effect",
    where: ($) => "where",
    import: ($) => "import",
    as: ($) => "as",
    exposing: ($) => "exposing",
    _if: ($) => seq("if", field("exprList", $._expression)),
    _then: ($) => seq("then", field("exprList", $._expression)),
    _else: ($) => seq("else", field("exprList", $._expression)),
    case: ($) => "case",
    of: ($) => "of",
    _let: ($) =>
      seq(
        "let",
        $._virtual_open_section,
        $._inner_declaration,
        optional($._more_inner_declarations),
        $._virtual_end_section
      ),
    _in: ($) => seq("in", field("body", $._expression)),
    type: ($) => "type",
    alias: ($) => "alias",
    port: ($) => "port",
    infix: ($) => "infix",
    left_parenthesis: ($) => "(",
    right_parenthesis: ($) => ")",
    left_square_bracket: ($) => "[",
    right_square_bracket: ($) => "]",
    left_brace: ($) => "{",
    right_brace: ($) => "}",
    double_dot: ($) => "..",
    comma: ($) => ",",
    eq: ($) => "=",
    arrow: ($) => "->",
    colon: ($) => ":",
    pipe: ($) => "|",
    backslash: ($) => "\\",
    underscore: ($) => "_",
    dot: ($) => ".",
    operator_identifier: ($) =>
      choice(
        "+",
        "-",
        "*",
        "/",
        "//",
        "^",
        "==",
        "/=",
        "<",
        ">",
        "<=",
        ">=",
        "&&",
        "||",
        "++",
        "<|",
        "|>",
        "<<",
        ">>",
        "::",
        "</>",
        "<?>",
        "|.",
        "|="
      ),
    glsl_begin: ($) => "[glsl|",
    glsl_end: ($) => "|]",

    _char_quote: ($) => "'",
  },
});

function commaSep1(rule, comma) {
  return sep1(rule, comma);
}

function arrowSep1(rule, arrow) {
  return sep1(rule, arrow);
}

function sep1(rule, separator) {
  return seq(rule, repeat(seq(separator, rule)));
}