95 lines
1.4 KiB
JavaScript
95 lines
1.4 KiB
JavaScript
module.exports = grammar({
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name: 'dust',
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word: $ => $.identifier,
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rules: {
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root: $ => repeat1($.item),
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item: $ => choice(
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$.comment,
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$.statement,
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),
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comment: $ => prec.left(seq(token('#'), /.*/)),
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statement: $ => choice(
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$.closed_statement,
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$.open_statement,
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),
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closed_statement: $ => seq($.expression, $.close),
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open_statement: $ => prec.left(seq($.expression)),
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expression: $ => choice(
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$.value,
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$.identifier,
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$.operation,
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$.control_flow,
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),
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close: $ => ";",
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identifier: $ => /[a-z|_|.]+/,
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value: $ => choice(
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$.integer,
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$.float,
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$.string,
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$.list,
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$.empty,
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$.boolean,
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$.function,
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),
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float: $ => /\d+\.\d*/,
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integer: $ => /\d+/,
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string: $ => /("|'|`)(.*?)("|'|`)/,
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function: $ => /{(.*?)}/,
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empty: $ => '()',
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boolean: $ => choice(
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'true',
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'false',
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),
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list: $ => seq(
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'(',
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repeat1(seq($.value, optional(','))),
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')'
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),
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operator: $ => choice(
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'+',
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'-',
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'=',
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'==',
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),
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operation: $ => prec.left(seq(
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$.expression,
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$.operator,
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$.expression,
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)),
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control_flow: $ => prec.right(seq(
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'if',
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$.expression,
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'then',
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$.statement,
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optional(seq('else', $.statement))
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)),
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_keywords: $ => choice(
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'if',
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'then',
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'else',
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),
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}
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});
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