200 lines
3.3 KiB
JavaScript
200 lines
3.3 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: $ => seq(token('#'), /.*/),
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statement: $ => prec.right(choice(
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$.expression,
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$.yield,
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)),
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yield: $ => prec.left(
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seq(
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$.expression,
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'->',
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$.expression,
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repeat(prec.left(seq('->', $.expression)))
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)
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),
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expression: $ => choice(
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$._expression_kind,
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seq('(', $._expression_kind, ')')
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),
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_expression_kind: $ => prec.right(choice(
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$.value,
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$.identifier,
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$.control_flow,
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$.select,
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$.insert,
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$.function_call,
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$.assignment,
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$.math,
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$.logic,
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$.loop,
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$.match,
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)),
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identifier: $ => /[a-z|_|.]+[0-9]?/,
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value: $ => prec.left(1, 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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$.boolean,
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$.function,
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$.table,
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$.map,
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)),
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float: $ => /[-]*[0-9]*[.]{1}[0-9]+/,
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integer: $ => /[-]*[0-9]+[.]{0}/,
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string: $ => /(".*?")|('.*?')|(`.*?`)/,
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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(field('item', $.value), optional(','))),
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']'
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),
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function: $ => seq(
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'function',
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optional(seq('<', repeat(seq($.identifier, optional(','))), '>')),
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'{',
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repeat1($.statement),
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'}',
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),
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table: $ => seq(
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'table',
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seq('<', repeat1(seq($.identifier, optional(','))), '>'),
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'{',
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repeat($.list),
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'}',
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),
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map: $ => seq(
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'map',
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'{',
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repeat(seq($.identifier, "=", $.value)),
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'}',
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),
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math: $ => prec.right(seq(
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$.expression,
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$.math_operator,
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$.expression,
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)),
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math_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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),
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logic: $ => prec.right(seq(
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$.expression,
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$.logic_operator,
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$.expression,
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)),
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logic_operator: $ => choice(
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'==',
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'&&',
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'||',
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'and',
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'or',
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),
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assignment: $ => prec.right(seq(
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$.identifier,
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choice("=", "+=", "-="),
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$.statement,
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)),
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select: $ => prec.right(seq(
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'select',
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$.identifier,
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'from',
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$.identifier,
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optional(
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seq('where', $.expression)
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),
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)),
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insert: $ => prec.right(seq(
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'insert',
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repeat1($.list),
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'into',
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$.identifier,
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optional(
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seq('where', $.expression)
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),
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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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function_call: $ => prec.right(seq(
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$.identifier,
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'<',
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repeat(seq($.expression, optional(','))),
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'>',
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)),
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loop: $ => choice(
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$.break_loop,
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$.while_loop,
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),
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while_loop: $ => seq(
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'while',
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$.expression,
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'{',
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$.statement,
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'}',
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),
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break_loop: $ => seq(
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'loop',
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'{',
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$.statement,
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'}',
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),
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match: $ => seq(
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'match',
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$.expression,
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'{',
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repeat1(seq($.expression, '=>', $.statement)),
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'}',
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),
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}
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});
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