112 lines
2.1 KiB
JavaScript
112 lines
2.1 KiB
JavaScript
function commaSeparated(elem) {
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return seq(elem, repeat(seq(",", elem)), optional(","))
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}
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module.exports = grammar({
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name: "blueprint",
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extras: ($) => [
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/\s+/,
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$.comment,
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],
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rules: {
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source_file: ($) => repeat($._definition),
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_definition: ($) => choice(
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$.assignment,
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),
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comment: (_) => seq("#", /.*/),
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// Definitions {{{
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assignment: ($) => seq(
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field("left", $.identifier),
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field("operator", choice("=", "+=")),
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field("right", $._expr),
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),
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// }}}
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// Expressions {{{
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_expr: ($) => choice(
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// Literals
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$.identifier,
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$.boolean_literal,
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$.integer_literal,
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$._string_literal,
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// Composites
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$.list_expression,
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$.map_expression,
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),
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// The Blueprint scanner makes use of Go's lexer, so copy their rule
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identifier: (_) => /[_\p{XID_Start}][_\p{XID_Continue}]*/,
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boolean_literal: (_) => choice("true", "false"),
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integer_literal: (_) => seq(optional("-"), /[0-9]+/),
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// The Blueprint scanner makes use of Go's lexer, so copy their rule
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_string_literal: ($) => choice(
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$.raw_string_literal,
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$.interpreted_string_literal,
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),
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raw_string_literal: (_) => token(seq(
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"`",
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/[^`]+/,
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"`",
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)),
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interpreted_string_literal: $ => seq(
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'"',
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repeat(choice(
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// Allow all characters without special meaning, disallow newlines
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/[^"\n\\]+/,
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$.escape_sequence,
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)),
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token.immediate('"'),
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),
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escape_sequence: (_) => token.immediate(seq(
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'\\',
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choice(
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/[^xuU]/,
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/\d{2,3}/,
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/x[0-9a-fA-F]{2,}/,
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/u[0-9a-fA-F]{4}/,
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/U[0-9a-fA-F]{8}/,
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),
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)),
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list_expression: ($) => seq(
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"[",
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optional(commaSeparated($._expr)),
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"]",
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),
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map_expression: ($) => seq(
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"{",
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optional(commaSeparated($._colon_property)),
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"}",
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),
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// }}}
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// Properties {{{
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_colon_property: ($) => seq(
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field("field", $.identifier),
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":",
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field("value", $._expr),
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),
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// }}}
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}
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});
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// vim: foldmethod=marker sw=2
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