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grammar.js
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grammar.js
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/**
* @file GN grammar for tree-sitter
* @author Amaan Qureshi <amaanq12@gmail.com>
* @license MIT
*/
/* eslint-disable arrow-parens */
/* eslint-disable camelcase */
/* eslint-disable-next-line spaced-comment */
/// <reference types="tree-sitter-cli/dsl" />
// @ts-check
const PREC = {
LOGICAL_OR: 1,
LOGICAL_AND: 2,
EQUALITY: 3,
COMPARE: 4,
ADD: 4,
CALL: 5,
MEMBER: 6,
UNARY: 7,
};
module.exports = grammar({
name: 'gn',
externals: $ => [
$._string_content,
],
extras: $ => [
/\s/,
$.comment,
],
supertypes: $ => [
$.statement,
$.expression,
],
word: $ => $.identifier,
rules: {
source_file: $ => repeat($.statement),
statement: $ => choice(
$.import_statement,
$.if_statement,
$.foreach_statement,
$.assignment_statement,
$.expression,
),
import_statement: $ => seq(
'import',
'(',
$.expression,
')',
),
if_statement: $ => prec.right(seq(
'if',
'(',
field('condition', $.expression),
')',
field('consequence', $.block),
repeat($.else_statement),
)),
else_statement: $ => seq(
'else',
field('alternative', choice($.if_statement, $.block)),
),
foreach_statement: $ => seq(
'foreach',
'(',
field('item', $.identifier),
',',
field('list', $.expression),
')',
$.block,
),
block: $ => seq(
'{',
repeat($.statement),
'}',
),
assignment_statement: $ => seq(
choice($.identifier, $.array_access, $.scope_access),
choice('=', '+=', '-='),
$.expression,
),
expression: $ => choice(
$.unary_expression,
$.binary_expression,
$.primary_expression,
),
primary_expression: $ => choice(
$.identifier,
$.integer,
$.string,
$.boolean,
$.call_expression,
$.array_access,
$.scope_access,
$.block,
$.parenthesized_expression,
$.list,
),
unary_expression: $ => prec.left(1, seq(
'!',
$.primary_expression,
)),
binary_expression: $ => {
const table = [
[choice('+', '-'), PREC.ADD],
[choice('<', '<=', '>', '>='), PREC.COMPARE],
[choice('==', '!='), PREC.EQUALITY],
['&&', PREC.LOGICAL_AND],
['||', PREC.LOGICAL_OR],
];
// @ts-ignore
return choice(...table.map(([operator, precedence]) => prec.left(precedence, seq(
field('left', $.expression),
// @ts-ignore
field('operator', operator),
field('right', $.expression),
))));
},
call_expression: $ => prec.left(PREC.CALL, seq(
field('function', $.identifier),
'(',
commaSep($.expression),
')',
optional($.block),
)),
array_access: $ => prec.left(PREC.MEMBER, seq(
field('array', $.expression),
'[',
field('index', $.expression),
']',
)),
scope_access: $ => prec.left(PREC.MEMBER, seq(
field('scope', $.expression),
'.',
field('field', $.identifier),
)),
parenthesized_expression: $ => seq(
'(',
$.expression,
')',
),
list: $ => seq(
'[',
commaSep($.expression),
']',
),
string: $ => seq(
'"',
optional($.string_content),
'"',
),
string_content: $ => repeat1(choice(
$.escape_sequence,
$.expansion,
$._string_content,
)),
escape_sequence: _ => /\\["$\\]/,
expansion: $ => choice(
seq('$', choice($.identifier, $.hex)),
seq('${', choice($.identifier, $.array_access, $.scope_access), '}'),
),
integer: _ => /-?\d+/,
hex: _ => /0x[0-9a-fA-F]+/,
boolean: _ => choice('true', 'false'),
identifier: _ => /[a-zA-Z_][a-zA-Z0-9_]*/,
comment: _ => token(seq('#', /.*/)),
},
});
/**
* Creates a rule to optionally match one or more of the rules separated by a comma
*
* @param {Rule} rule
*
* @return {ChoiceRule}
*
*/
function commaSep(rule) {
return optional(commaSep1(rule));
}
/**
* Creates a rule to match one or more of the rules separated by a comma
*
* @param {Rule} rule
*
* @return {SeqRule}
*
*/
function commaSep1(rule) {
return seq(rule, repeat(seq(',', rule)), optional(','));
}