364 lines
5.9 KiB
JavaScript
364 lines
5.9 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: $ => prec(1, repeat1($.statement)),
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_comment: $ => /[#][^#\n]*[#|\n]/,
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block: $ => seq(
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optional('async'),
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'{',
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repeat1($.statement),
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'}',
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),
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statement: $ => prec.left(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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$.insert,
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$.match,
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$.return,
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$.select,
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$.use,
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$.while,
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),
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optional(';'),
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)),
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expression: $ => prec.right(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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$.function_call,
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$.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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_expression_list: $ => repeat1(prec.right(seq(
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$.expression,
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optional(','),
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))),
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identifier: $ => /[_a-zA-Z]+[_a-zA-Z0-9]?/,
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value: $ => choice(
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$.integer,
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$.float,
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$.string,
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$.boolean,
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$.list,
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$.function,
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$.table,
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$.map,
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),
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integer: $ => token(prec.left(seq(
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optional('-'),
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repeat1(
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choice('1', '2', '3', '4', '5', '6', '7', '8', '9', '0')
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),
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))),
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float: $ => token(prec.left(seq(
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optional('-'),
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repeat1(choice('1', '2', '3', '4', '5', '6', '7', '8', '9', '0')),
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'.',
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repeat1(choice('1', '2', '3', '4', '5', '6', '7', '8', '9', '0')),
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))),
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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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repeat(prec.left(seq($.expression, optional(',')))),
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']',
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),
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map: $ => seq(
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'{',
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repeat(seq(
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$.identifier,
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"=",
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$.statement,
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optional(',')
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)),
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'}',
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),
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index: $ => prec.left(1, seq(
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$.expression,
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':',
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$.expression,
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optional(seq(
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'..',
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$.expression,
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)),
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)),
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math: $ => prec.left(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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'||',
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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: $ => seq(
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field('identifier', $.identifier),
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optional(field('type', $.type)),
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field('assignment_operator', $.assignment_operator),
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field('statement', $.statement),
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),
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index_assignment: $ => 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: $ => prec.right(choice(
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"=",
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"+=",
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"-=",
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)),
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if_else: $ => prec.right(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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if: $ => seq(
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'if',
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$.expression,
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$.block,
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),
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else_if: $ => 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(
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'else',
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$.block,
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),
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match: $ => prec.right(seq(
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'match',
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$.expression,
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repeat1(seq(
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$.expression,
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'=>',
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$.block,
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)),
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)),
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while: $ => 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: $ => seq(
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choice(
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'for',
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'async for',
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),
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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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select: $ => prec.right(seq(
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'select',
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$.identifier_list,
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'from',
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$.expression,
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optional($.block),
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)),
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insert: $ => prec.right(seq(
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'insert',
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'into',
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$.identifier,
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$.expression,
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)),
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identifier_list: $ => prec.right(choice(
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seq(
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'|',
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repeat(seq($.identifier, optional(','))),
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'|',
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),
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)),
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table: $ => prec.right(seq(
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'table',
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$.identifier_list,
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$.expression,
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)),
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return: $ => seq(
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'return',
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$.expression,
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),
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use: $ => seq(
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'use',
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$.string,
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),
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type: $ => seq(
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'<',
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choice(
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'any',
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'bool',
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'fn',
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'int',
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'list',
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'map',
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'str',
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'table',
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),
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'>',
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),
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function: $ => seq(
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'|',
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repeat($.parameter),
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'|',
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optional($.type),
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$.block,
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),
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parameter: $ => seq(
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$.identifier,
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$.type,
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optional(','),
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),
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function_call: $ => prec.right(1, seq(
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'(',
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choice(
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$.built_in_function,
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$._context_defined_function,
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),
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')',
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)),
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_context_defined_function: $ => prec.right(1, seq(
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$.expression,
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optional($._expression_list),
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)),
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built_in_function: $ => prec.right(seq(
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$._built_in_function_name,
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optional($._expression_list),
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)),
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yield: $ => prec.left(seq(
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$.expression,
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'->',
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'(',
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choice(
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$.built_in_function,
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$._context_defined_function,
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),
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')',
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)),
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_built_in_function_name: $ => choice(
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// General
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'assert',
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'assert_equal',
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'context',
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'download',
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'help',
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'length',
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'output',
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'output_error',
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'type',
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// Filesystem
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'append',
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'metadata',
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'move',
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'read',
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'workdir',
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'write',
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// Format conversion
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'from_json',
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'to_json',
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'to_string',
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'to_float',
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// Command
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'bash',
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'fish',
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'raw',
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'sh',
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'zsh',
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// Random
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'random',
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'random_boolean',
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'random_float',
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'random_integer',
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// Tables
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'columns',
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'rows',
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// Lists
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'reverse',
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),
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}
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}); |