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dust/tree-sitter-dust/grammar.js

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module.exports = grammar({
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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statement: $ =>
prec.left(
seq(
optional(
choice('return', 'break'),
),
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$.statement_kind,
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optional(';'),
),
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),
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statement_kind: $ =>
prec.left(
choice(
$.assignment,
$.block,
$.expression,
$.for,
$.if_else,
$.index_assignment,
$.match,
$.pipe,
$.while,
$.type_definition,
),
),
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expression: $ =>
choice(
$._expression_kind,
seq(
'(',
$._expression_kind,
')',
),
),
_expression_kind: $ =>
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prec.right(
choice(
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$.as,
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$.function_call,
$.identifier,
$.index,
$.logic,
$.math,
$.value,
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$.command,
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),
),
_expression_list: $ =>
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repeat1(
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prec.right(
seq(
$.expression,
optional(','),
),
),
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),
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as: $ =>
seq($.expression, 'as', $.type),
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pipe: $ =>
prec(
1,
seq(
choice(
$.command,
$.function_call,
),
'|',
choice(
$.command,
$.pipe,
$.function_call,
),
),
),
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command: $ =>
prec.right(
seq(
'^',
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$.command_text,
repeat($.command_argument),
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),
),
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command_text: $ => /\S+/,
command_argument: $ =>
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choice(
/[^^|;\s]+/,
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/("[^"]*?")|('[^']*?')|(`[^`]*?`)/,
),
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block: $ =>
seq(
optional('async'),
'{',
repeat($.statement),
'}',
),
identifier: $ =>
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/[_a-zA-Z]+[_a-zA-Z0-9]*[_a-zA-Z]?/,
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value: $ =>
choice(
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$.function,
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$.integer,
$.float,
$.string,
$.boolean,
$.list,
$.map,
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$.range,
$.struct_instance,
$.enum_instance,
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),
range: $ => /\d+[.]{2}\d+/,
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integer: $ => /[-]?\d+/,
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float: $ =>
choice(
/[-|+]?\d*[.][\d|e|-]*/,
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'Infinity',
'infinity',
'NaN',
'nan',
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),
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string: $ =>
/("[^"]*?")|('[^']*?')|(`[^`]*?`)/,
boolean: $ =>
choice('true', 'false'),
list: $ =>
seq(
'[',
repeat(
prec.left(
seq(
$.expression,
optional(','),
),
),
),
']',
),
map: $ =>
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prec(
1,
seq(
'{',
repeat(
seq(
$.identifier,
optional(
$.type_specification,
),
'=',
$.statement,
optional(','),
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),
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),
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'}',
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),
),
index: $ =>
prec.left(
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1,
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seq(
$.index_expression,
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':',
$.index_expression,
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),
),
index_expression: $ =>
prec(
1,
choice(
seq(
'(',
$.function_call,
')',
),
$.identifier,
$.index,
$.value,
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$.range,
),
),
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math: $ =>
prec.left(
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seq(
$.expression,
$.math_operator,
$.expression,
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),
),
math_operator: $ =>
choice('+', '-', '*', '/', '%'),
logic: $ =>
prec.left(
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seq(
$.expression,
$.logic_operator,
$.expression,
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),
),
logic_operator: $ =>
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prec.left(
choice(
'==',
'!=',
'&&',
'||',
'>',
'<',
'>=',
'<=',
),
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),
assignment: $ =>
seq(
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$.identifier,
optional($.type_specification),
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$.assignment_operator,
$.statement,
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),
index_assignment: $ =>
seq(
$.index,
$.assignment_operator,
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$.statement,
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),
assignment_operator: $ =>
prec.right(
choice('=', '+=', '-='),
),
if_else: $ =>
prec.right(
seq(
$.if,
repeat($.else_if),
optional($.else),
),
),
if: $ =>
seq('if', $.expression, $.block),
else_if: $ =>
seq(
'else if',
$.expression,
$.block,
),
else: $ => seq('else', $.block),
match: $ =>
prec.right(
seq(
'match',
$.expression,
'{',
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repeat1(
seq(
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$.match_pattern,
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'->',
$.statement,
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optional(','),
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),
),
'}',
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),
),
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match_pattern: $ =>
choice(
$.enum_pattern,
$.value,
'*',
),
enum_pattern: $ =>
prec(
1,
seq(
$.identifier,
'::',
$.identifier,
optional(
seq('(', $.identifier, ')'),
),
),
),
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while: $ =>
seq(
'while',
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$.expression,
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$.block,
),
for: $ =>
seq(
choice('for', 'async for'),
$.identifier,
'in',
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$.expression,
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$.block,
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),
type_specification: $ =>
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seq('<', $.type, '>'),
type: $ =>
prec.right(
choice(
'any',
'bool',
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'collection',
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'float',
'int',
'map',
seq(
'{',
repeat1(
seq(
$.identifier,
$.type_specification,
),
),
'}',
),
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'none',
'num',
'str',
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$.identifier,
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seq(
$.identifier,
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'<',
repeat1(
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seq(
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$.type,
optional(','),
),
),
'>',
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),
seq('[', $.type, ']'),
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seq(
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'(',
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repeat(
seq(
$.type,
optional(','),
),
),
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')',
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optional(seq('->', $.type)),
),
),
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),
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function: $ =>
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seq(
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'(',
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repeat(
seq(
$.identifier,
$.type_specification,
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optional(','),
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),
),
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')',
$.type_specification,
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$.block,
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),
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function_expression: $ =>
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choice(
$._function_expression_kind,
seq(
'(',
$._function_expression_kind,
')',
),
),
_function_expression_kind: $ =>
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prec(
2,
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choice(
$.function_call,
$.identifier,
$.index,
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$.value,
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),
),
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function_call: $ =>
prec.right(
seq(
$.function_expression,
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'(',
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optional($._expression_list),
')',
),
),
type_definition: $ =>
choice(
$.enum_definition,
$.struct_definition,
),
enum_definition: $ =>
prec.right(
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seq(
'enum',
$.identifier,
repeat(
seq(
'{',
repeat1(
seq(
$.identifier,
optional(
seq(
'(',
choice(
$.type,
$.type_definition,
),
')',
),
),
optional(','),
),
),
'}',
),
),
),
),
enum_instance: $ =>
prec.right(
seq(
$.identifier,
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'::',
$.identifier,
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optional(
seq('(', $.expression, ')'),
),
),
),
struct_definition: $ =>
seq(
'struct',
$.identifier,
'{',
repeat(
choice(
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seq(
$.identifier,
$.type_specification,
),
seq(
$.identifier,
'=',
$.statement,
),
seq(
$.identifier,
$.type_specification,
'=',
$.statement,
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),
),
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),
'}',
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),
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struct_instance: $ =>
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seq($.identifier, '::', $.map),
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},
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});