tree-sitter-bp/grammar.js

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function commaSeparated(elem) {
return seq(elem, repeat(seq(",", elem)), optional(","))
}
function trailingCommaSeparated(elem) {
return repeat(seq(elem, ","))
}
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module.exports = grammar({
name: "bp",
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extras: ($) => [
/\s+/,
$.comment,
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],
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rules: {
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source_file: ($) => repeat($._definition),
_definition: ($) => choice(
$.assignment,
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$.module,
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),
comment: (_) => choice(
seq("//", /(\\+(.|\r?\n)|[^\\\n])*/),
seq("/*", /[^*]*\*+([^/*][^*]*\*+)*/, "/"),
),
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// Definitions {{{
assignment: ($) => seq(
field("left", $.identifier),
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field("operator", alias(choice("=", "+="), $.operator)),
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field("right", $._expr),
),
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module: ($) => choice(
$._old_module,
$._new_module,
),
// This syntax is deprecated, but still accepted
_old_module: ($) => seq(
field("type", $.identifier),
"{",
optional(commaSeparated(
alias(field("property", $._colon_property), $.property)
)),
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"}",
),
_new_module: ($) => seq(
field("type", $.identifier),
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"(",
optional(commaSeparated(
alias(field("property", $._equal_property), $.property)
)),
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")",
),
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// }}}
// Expressions {{{
_expr: ($) => choice(
// Literals
$.identifier,
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$.boolean_literal,
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$.integer_literal,
$._string_literal,
// Conditionals
$.select_expression,
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// Composites
$.list_expression,
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$.map_expression,
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// Operators
$.binary_expression,
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),
// The Blueprint scanner makes use of Go's lexer, so copy their rule
identifier: (_) => /[_\p{XID_Start}][_\p{XID_Continue}]*/,
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boolean_literal: (_) => choice("true", "false"),
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integer_literal: (_) => seq(optional("-"), /[0-9]+/),
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// The Blueprint scanner makes use of Go's lexer, so copy their rule
_string_literal: ($) => choice(
$.raw_string_literal,
$.interpreted_string_literal,
),
raw_string_literal: (_) => token(seq(
"`",
/[^`]+/,
"`",
)),
interpreted_string_literal: $ => seq(
'"',
repeat(choice(
// Allow all characters without special meaning, disallow newlines
/[^"\n\\]+/,
$.escape_sequence,
)),
token.immediate('"'),
),
escape_sequence: (_) => token.immediate(seq(
'\\',
choice(
/[^xuU]/,
/\d{2,3}/,
/x[0-9a-fA-F]{2,}/,
/u[0-9a-fA-F]{4}/,
/U[0-9a-fA-F]{8}/,
),
)),
select_expression: ($) => seq(
"select",
"(",
$.select_value,
",",
$.select_cases,
")",
),
select_value: ($) => seq(
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field("name", $.identifier),
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"(",
field("arguments", optional(commaSeparated($._string_literal))),
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")",
),
select_cases: ($) => seq(
"{",
optional(trailingCommaSeparated($.select_case)),
"}",
),
select_case: ($) => seq(
field("pattern", choice(
$._string_literal,
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$.boolean_literal,
alias("default", $.default),
)),
":",
field("value", $._case_value)
),
_case_value: ($) => choice(
alias("unset", $.unset),
$._expr,
),
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list_expression: ($) => seq(
"[",
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optional(commaSeparated(field("element", $._expr))),
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"]",
),
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map_expression: ($) => seq(
"{",
optional(commaSeparated(
alias(field("property", $._colon_property), $.property)
)),
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"}",
),
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binary_expression: ($) => prec.left(seq(
field("left", $._expr),
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field("operator", alias("+", $.operator)),
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field("right", $._expr),
)),
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// }}}
// Properties {{{
_colon_property: ($) => seq(
field("field", $.identifier),
":",
field("value", $._expr),
),
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_equal_property: ($) => seq(
field("field", $.identifier),
"=",
field("value", $._expr),
),
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// }}}
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}
});
// vim: foldmethod=marker sw=2