init

grammar.js

@@ -0,0 +1,120 @@
+module.exports = grammar({
+	name: 'lila',
+
+	word: $ => $.identifier,
+
+	rules: {
+		source_file: $ => repeat($._definition),
+
+		_definition: $ => choice(
+			$.function_definition
+		),
+
+		function_definition: $ => seq(
+			'func',
+			field('name', $.identifier),
+			field('parameters', $.parameters),
+			field('return_type', optional($._type)),
+			field('body', $.block),
+		),
+
+		parameters: $ => seq(
+			'(',
+			optional(seq(
+				repeat(seq($.parameter, ',')),
+				seq($.parameter, optional(',')),
+			)),
+			')',
+		),
+
+		parameter: $ => seq(
+			$.identifier,
+			' ',
+			$._type,
+		),
+
+		block: $ => seq(
+			'{',
+			repeat($._statement),
+			optional($._expression),
+			'}',
+		),
+
+		_statement: $ => choice(
+			$.return_statement,
+			$.assign_statement,
+			$.if_statement,
+		),
+
+		if_statement: $ => seq(
+			'if',
+			field('condition', $._expression),
+			field('body', $.block),
+			';'
+		),
+
+		if_expression: $ => seq(
+			'if',
+			field('condition', $._expression),
+			field('body', $.block),
+			field('else',
+				seq('else', choice(
+					$._expression,
+					$.block,
+				))
+			),
+		),
+
+		return_statement: $ => seq(
+			'return',
+			optional($._expression),
+			';',
+		),
+
+		assign_statement: $ => seq(
+			$.identifier,
+			'=',
+			$._expression,
+			';',
+		),
+
+		_expression: $ => choice(
+			$.unary_expression,
+			$.binary_expression,
+			$.if_expression,
+			$.boolean_literal,
+			$.integer_literal,
+			$.identifier,
+		),
+
+		unary_expression: $ => prec(10, choice(
+			seq('-', $._expression),
+			seq('!', $._expression),
+		)),
+
+		binary_expression: $ => choice(
+			prec.left(4, seq($._expression, '*', $._expression)),
+			prec.left(3, seq($._expression, '+', $._expression)),
+			prec.left(2, seq($._expression, '||', $._expression)),
+			prec.left(1, seq($._expression, '&&', $._expression)),
+		),
+
+		identifier: $ => /[a-z_]+[a-zA-Z0-9_]*/,
+
+		integer_literal: $ => /\d+/,
+
+		boolean_literal: $ => choice('true', 'false'),
+
+		//string_literal: $ => /"[]"/,
+
+		_type: $ => choice(
+			$.primitive_type,
+		),
+
+		primitive_type: $ => choice(
+			'bool',
+			'int',
+			'uint',
+		),
+	}
+});