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dust/tree-sitter-dust/grammar.js

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module.exports = grammar({
name: 'dust',
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(
optional('async'),
'{',
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repeat1($.statement),
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'}',
),
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statement: $ => prec.left(seq(
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choice(
$.assignment,
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$.block,
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$.expression,
$.for,
$.if_else,
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$.index_assignment,
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$.insert,
$.match,
$.return,
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$.select,
$.use,
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$.while,
),
optional(';'),
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)),
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expression: $ => prec.right(choice(
$._expression_kind,
seq('(', $._expression_kind, ')'),
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)),
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_expression_kind: $ => prec.right(choice(
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$.function_call,
$.identifier,
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$.index,
$.logic,
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$.math,
$.value,
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$.yield,
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)),
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_expression_list: $ => repeat1(prec.right(seq(
$.expression,
optional(','),
))),
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identifier: $ => /[_a-zA-Z]+[_a-zA-Z0-9]?/,
value: $ => choice(
$.integer,
$.float,
$.string,
$.boolean,
$.list,
$.function,
$.table,
$.map,
),
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integer: $ => token(prec.left(seq(
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optional('-'),
repeat1(
choice('1', '2', '3', '4', '5', '6', '7', '8', '9', '0')
),
))),
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float: $ => token(prec.left(seq(
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optional('-'),
repeat1(choice('1', '2', '3', '4', '5', '6', '7', '8', '9', '0')),
'.',
repeat1(choice('1', '2', '3', '4', '5', '6', '7', '8', '9', '0')),
))),
string: $ => /("[^"]*?")|('[^']*?')|(`[^`]*?`)/,
boolean: $ => choice(
'true',
'false',
),
list: $ => seq(
'[',
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repeat(prec.left(seq($.expression, optional(',')))),
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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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"=",
$.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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$.expression,
':',
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$.expression,
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optional(seq(
'..',
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$.expression,
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)),
)),
math: $ => prec.left(seq(
$.expression,
$.math_operator,
$.expression,
)),
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math_operator: $ => choice(
'+',
'-',
'*',
'/',
'%',
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),
logic: $ => prec.right(seq(
$.expression,
$.logic_operator,
$.expression,
)),
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logic_operator: $ => choice(
'==',
'!=',
'&&',
'||',
'>',
'<',
">=",
"<=",
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),
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assignment: $ => seq(
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field('identifier', $.identifier),
optional(field('type', $.type)),
field('assignment_operator', $.assignment_operator),
field('statement', $.statement),
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),
index_assignment: $ => seq(
$.index,
$.assignment_operator,
$.statement,
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),
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assignment_operator: $ => prec.right(choice(
"=",
"+=",
"-=",
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)),
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if_else: $ => prec.right(seq(
$.if,
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repeat($.else_if),
optional($.else),
)),
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if: $ => seq(
'if',
$.expression,
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$.block,
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),
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else_if: $ => seq(
'else if',
$.expression,
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$.block,
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),
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else: $ => seq(
'else',
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$.block,
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),
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match: $ => prec.right(seq(
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'match',
$.expression,
repeat1(seq(
$.expression,
'=>',
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$.block,
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)),
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)),
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while: $ => seq(
'while',
$.expression,
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$.block,
),
for: $ => seq(
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choice(
'for',
'async for',
),
$.identifier,
'in',
$.expression,
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$.block,
),
select: $ => prec.right(seq(
'select',
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$.identifier_list,
'from',
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$.expression,
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optional($.block),
)),
insert: $ => prec.right(seq(
'insert',
'into',
$.identifier,
$.expression,
)),
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identifier_list: $ => prec.right(choice(
seq(
'|',
repeat(seq($.identifier, optional(','))),
'|',
),
)),
table: $ => prec.right(seq(
'table',
$.identifier_list,
$.expression,
)),
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return: $ => seq(
'return',
$.expression,
),
use: $ => seq(
'use',
$.string,
),
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type: $ => seq(
'<',
choice(
'any',
'bool',
'fn',
'int',
'list',
'map',
'str',
'table',
),
'>',
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),
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function: $ => seq(
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'|',
repeat($.parameter),
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'|',
optional($.type),
$.block,
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),
parameter: $ => seq(
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$.identifier,
$.type,
optional(','),
),
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function_call: $ => prec.right(1, seq(
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'(',
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choice(
$.built_in_function,
$._context_defined_function,
),
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')',
)),
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_context_defined_function: $ => prec.right(1, seq(
$.expression,
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optional($._expression_list),
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)),
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built_in_function: $ => prec.right(seq(
$._built_in_function_name,
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optional($._expression_list),
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)),
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yield: $ => prec.left(seq(
$.expression,
'->',
'(',
choice(
$.built_in_function,
$._context_defined_function,
),
')',
)),
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_built_in_function_name: $ => choice(
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// General
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'assert',
'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',
'type',
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// Filesystem
'append',
'metadata',
'move',
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'read',
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'workdir',
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'write',
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// Format conversion
'from_json',
'to_json',
'to_string',
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'to_float',
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// Command
'bash',
'fish',
'raw',
'sh',
'zsh',
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// Random
'random',
'random_boolean',
'random_float',
'random_integer',
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// Tables
'columns',
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'rows',
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// Lists
'reverse',
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),
}
});