453 lines
7.5 KiB
JavaScript
453 lines
7.5 KiB
JavaScript
module.exports = grammar({
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name: 'dust',
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word: $ => $.identifier,
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extras: $ => [/\s/, $._comment],
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rules: {
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root: $ =>
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prec(1, repeat1($.statement)),
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_comment: $ => /[#][^#\n]*[#|\n]/,
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statement: $ =>
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prec.left(
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seq(
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choice(
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$.assignment,
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$.block,
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$.expression,
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$.for,
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$.if_else,
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$.index_assignment,
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$.match,
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$.return,
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$.while,
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),
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optional(';'),
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),
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),
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expression: $ =>
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choice(
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$._expression_kind,
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seq(
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'(',
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$._expression_kind,
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')',
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),
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),
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_expression_kind: $ =>
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prec.right(
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choice(
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$.function_call,
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$.identifier,
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$.index,
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$.logic,
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$.math,
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$.value,
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$.yield,
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),
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),
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_expression_list: $ =>
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repeat1(
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prec.right(
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seq(
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$.expression,
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optional(','),
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),
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),
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),
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block: $ =>
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seq(
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optional('async'),
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'{',
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repeat($.statement),
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'}',
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),
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identifier: $ =>
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/[_a-zA-Z]+[_a-zA-Z0-9]*[_a-zA-Z]?/,
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value: $ =>
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choice(
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$.function,
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$.integer,
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$.float,
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$.string,
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$.boolean,
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$.list,
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$.map,
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$.option,
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$.built_in_value,
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),
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integer: $ =>
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token(
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prec.left(
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seq(
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optional('-'),
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repeat1(
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choice(
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'1',
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'2',
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'3',
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'4',
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'5',
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'6',
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'7',
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'8',
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'9',
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'0',
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),
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),
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),
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),
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),
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float: $ =>
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token(
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prec.left(
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seq(
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optional('-'),
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repeat1(
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choice(
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'1',
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'2',
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'3',
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'4',
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'5',
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'6',
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'7',
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'8',
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'9',
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'0',
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),
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),
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'.',
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repeat1(
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choice(
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'1',
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'2',
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'3',
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'4',
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'5',
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'6',
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'7',
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'8',
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'9',
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'0',
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),
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),
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),
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),
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),
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string: $ =>
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/("[^"]*?")|('[^']*?')|(`[^`]*?`)/,
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boolean: $ =>
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choice('true', 'false'),
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list: $ =>
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seq(
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'[',
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repeat(
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prec.left(
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seq(
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$.expression,
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optional(','),
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),
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),
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),
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']',
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),
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map: $ =>
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seq(
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'{',
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repeat1(
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seq(
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$.identifier,
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optional($.type_definition),
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'=',
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$.statement,
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optional(','),
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),
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),
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'}',
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),
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option: $ =>
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choice(
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'none',
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seq(
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'some',
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'(',
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$.expression,
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')',
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),
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),
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index: $ =>
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prec.left(
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1,
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seq(
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$.index_expression,
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':',
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$.index_expression,
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optional(
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seq('..', $.expression),
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),
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),
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),
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index_expression: $ =>
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prec(
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1,
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choice(
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seq(
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'(',
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$.function_call,
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')',
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),
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$.identifier,
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$.index,
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$.value,
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),
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),
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math: $ =>
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prec.left(
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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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),
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math_operator: $ =>
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choice('+', '-', '*', '/', '%'),
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logic: $ =>
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prec.left(
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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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),
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logic_operator: $ =>
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prec.left(
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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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'>=',
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'<=',
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),
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),
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assignment: $ =>
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seq(
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$.identifier,
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optional($.type_definition),
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$.assignment_operator,
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$.statement,
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),
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index_assignment: $ =>
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seq(
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$.index,
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$.assignment_operator,
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$.statement,
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),
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assignment_operator: $ =>
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prec.right(
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choice('=', '+=', '-='),
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),
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if_else: $ =>
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prec.right(
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seq(
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$.if,
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repeat($.else_if),
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optional($.else),
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),
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),
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if: $ =>
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seq('if', $.expression, $.block),
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else_if: $ =>
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seq(
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'else if',
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$.expression,
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$.block,
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),
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else: $ => seq('else', $.block),
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match: $ =>
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prec.right(
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seq(
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'match',
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$.expression,
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'{',
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repeat1(
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seq(
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choice($.expression, '*'),
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'=>',
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$.statement,
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optional(','),
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),
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),
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'}',
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),
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),
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while: $ =>
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seq(
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'while',
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$.expression,
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$.block,
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),
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for: $ =>
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seq(
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choice('for', 'async for'),
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$.identifier,
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'in',
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$.expression,
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$.block,
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),
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return: $ =>
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prec.right(
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seq('return', $.statement),
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),
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type_definition: $ =>
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seq('<', $.type, '>'),
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type: $ =>
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prec.right(
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choice(
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'any',
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'bool',
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'collection',
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'float',
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'int',
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'map',
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'none',
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'num',
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'str',
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seq('[', $.type, ']'),
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seq(
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'(',
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repeat(
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seq(
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$.type,
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optional(','),
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),
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),
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')',
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optional(seq('->', $.type)),
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),
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seq(
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'option',
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'(',
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$.type,
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')',
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),
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),
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),
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function: $ =>
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seq(
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'(',
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repeat(
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seq(
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$.identifier,
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$.type_definition,
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optional(','),
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),
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),
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')',
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$.type_definition,
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$.block,
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),
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function_expression: $ =>
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choice(
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$._function_expression_kind,
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seq(
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'(',
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$._function_expression_kind,
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')',
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),
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),
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_function_expression_kind: $ =>
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prec(
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2,
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choice(
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$.function_call,
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$.identifier,
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$.index,
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$.value,
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$.yield,
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),
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),
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function_call: $ =>
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prec.right(
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seq(
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$.function_expression,
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'(',
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optional($._expression_list),
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')',
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),
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),
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yield: $ =>
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prec.left(
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1,
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seq(
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$.expression,
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'->',
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$.function_expression,
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optional(
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seq(
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'(',
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$._expression_list,
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')',
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),
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),
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),
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),
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built_in_value: $ =>
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choice(
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'args',
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'assert_equal',
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'env',
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'fs',
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'json',
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'length',
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'output',
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'random',
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'string',
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),
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},
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});
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