111 lines
2.2 KiB
JavaScript
111 lines
2.2 KiB
JavaScript
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const PREC = {
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range: 15,
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call: 14,
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field: 13,
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unary: 12,
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cast: 11,
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multiplicative: 10,
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additive: 9,
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shift: 8,
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bitand: 7,
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bitxor: 6,
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bitor: 5,
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comparative: 4,
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and: 3,
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or: 2,
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assign: 0,
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closure: -1,
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};
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module.exports = grammar({
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name: "rhai",
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externals: ($) => [
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$._string_content,
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$.raw_string_literal,
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$.float_literal,
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$.block_comment,
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],
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extras: (_) => [/\s/],
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word: ($) => $.identifier,
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inline: ($) => [$._declaration_statement],
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supertypes: ($) => [
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$._expression,
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$._literal,
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$._literal_pattern,
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$._declaration_statement,
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$._pattern,
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],
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rules: {
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source_file: ($) => repeat($._statement),
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// statements
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_statement: ($) => choice($.expression_statement, $._declaration_statement),
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expression_statement: ($) => choice(seq($._expression, ";")),
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_declaration_statement: ($) => choice($.let_declaration),
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let_declaration: ($) =>
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seq(
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"let",
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field("pattern", $._pattern),
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optional(seq("=", field("value", $._expression))),
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";"
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),
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// patterns
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_pattern: ($) => choice($._literal_pattern, $.identifier, "_"),
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// expressions
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_expression: ($) =>
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choice($.assignment_expression, $._literal, prec.left($.identifier)),
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assignment_expression: ($) =>
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prec.left(
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PREC.assign,
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seq(field("left", $._expression), "=", field("right", $._expression))
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),
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// literals
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_literal: ($) =>
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choice($.string_literal, $.raw_string_literal, $.integer_literal),
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_literal_pattern: ($) =>
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choice($.string_literal, $.raw_string_literal, $.integer_literal),
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integer_literal: (_) => token(seq(choice(/[0-9][0-9_]*/))),
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string_literal: ($) => seq(
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alias(/b?"/, '"'),
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repeat(choice($.escape_sequence, $._string_content)),
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token.immediate('"')
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),
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escape_sequence: (_) =>
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token.immediate(
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seq(
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"\\",
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choice(
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/[^xu]/,
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/u[0-9a-fA-F]{4}/,
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/u{[0-9a-fA-F]+}/,
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/x[0-9a-fA-F]{2}/
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)
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)
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),
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// identifiers
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identifier: ($) => /(r#)?[_\p{XID_Start}][_\p{XID_Continue}]*/,
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},
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});
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