experimental mugene2 grammar.js

grammar.js

module.exports = grammar({
    name: 'mugene2',
    rules: {
        source_file: $ => $.expression_or_operation_uses,

        expression_or_operation_uses: $ => choice(
            $.operation_uses,
        ),

        operation_uses: $ => repeat1($.operation_use),

        operation_use: $ => choice(
            seq($.can_be_identifier, optional($.arguments_opt_curly))
        ),

        arguments_opt_curly: $ => choice(
            seq('{', $.arguments, '}'),
            seq('{', '}'),
            $.arguments
        ),

        arguments: $ => choice(
            seq($.arguments, ',', $.argument),
            $.argument
        ),

        argument: $ => $.expression,

        expression: $ => $.conditional_expr,

        conditional_expr: $ => choice(
            $.comparison_expr,
            seq($.comparison_expr, '?', $.conditional_expr, ',', $.conditional_expr)
        ),

        comparison_expr: $ => choice(
            $.add_sub_expr,
            seq($.add_sub_expr, $.comparison_operator, $.comparison_expr)
        ),

        comparison_operator: $ => choice(
            "\\<",
            "\\<=",
            "\\>",
            "\\>="
        ),

        add_sub_expr: $ => choice(
            $.mul_div_mod_expr,
            seq($.add_sub_expr, '+', $.mul_div_mod_expr),
            seq($.add_sub_expr, '^', $.mul_div_mod_expr),
            seq($.add_sub_expr, '-', $.mul_div_mod_expr)
        ),

        mul_div_mod_expr: $ => choice(
            $.primary_expr,
            seq($.mul_div_mod_expr, '*', $.primary_expr),
            seq($.mul_div_mod_expr, '/', $.primary_expr),
            seq($.mul_div_mod_expr, '%', $.primary_expr)
        ),

        primary_expr: $ => choice(
            $.variable_reference,
            $.string_constant,
            //seq('{', $.expression, '}'),
            $.step_constant,
            $.unary_expr
        ),

        unary_expr: $ => choice(
            $.number_or_length_constant,
            seq('-', $.number_or_length_constant),
            seq('^', $.number_or_length_constant)
        ),

        variable_reference: $ => seq('$', $.can_be_identifier),

        string_constant: $ => $.string_literal,

        step_constant: $ => seq('%', $.number_literal),

        number_or_length_constant: $ => choice(
            $.number_literal,
            seq($.number_literal, $.dots),
            $.dots
        ),

        dots: $ => repeat1('.'),

        can_be_identifier: $ => choice(
            $.identifier,
            ':'
        ),

        // terminals
        string_literal: $ => choice(
            seq('\'', /[A-Za-z_]+/, '\''),
            seq('"', /[A-Za-z_]+/, '"')
        ),

        number_literal: $=> /[0-9]+/,

        identifier: $ => /[A-Za-z_!%&\(\)=~|\\\[\]<>@]+/
    }
});