215 lines
4.3 KiB
JavaScript
215 lines
4.3 KiB
JavaScript
function commaSeparated(elem) {
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return seq(elem, repeat(seq(",", elem)), optional(","))
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}
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function trailingCommaSeparated(elem) {
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return repeat(seq(elem, ","))
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}
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module.exports = grammar({
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name: "bp",
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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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$.module,
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),
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comment: (_) => choice(
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seq("//", /(\\+(.|\r?\n)|[^\\\n])*/),
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seq("/*", /[^*]*\*+([^/*][^*]*\*+)*/, "/"),
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),
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// Definitions {{{
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assignment: ($) => seq(
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field("left", $.identifier),
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field("operator", alias(choice("=", "+="), $.operator)),
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field("right", $._expr),
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),
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module: ($) => choice(
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$._old_module,
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$._new_module,
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),
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// This syntax is deprecated, but still accepted
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_old_module: ($) => seq(
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field("type", $.identifier),
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"{",
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optional(commaSeparated(
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alias(field("property", $._colon_property), $.property)
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)),
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"}",
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),
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_new_module: ($) => seq(
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field("type", $.identifier),
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"(",
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optional(commaSeparated(
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alias(field("property", $._equal_property), $.property)
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)),
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")",
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),
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// }}}
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// Expressions {{{
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_expr: ($) => 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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// Conditionals
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$.select_expression,
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// Composites
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$.list_expression,
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$.map_expression,
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// Operators
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$.binary_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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$.escape_sequence,
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)),
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token.immediate('"'),
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),
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escape_sequence: (_) => token.immediate(seq(
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'\\',
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choice(
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/[^xuU]/,
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/\d{2,3}/,
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/x[0-9a-fA-F]{2,}/,
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/u[0-9a-fA-F]{4}/,
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/U[0-9a-fA-F]{8}/,
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),
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)),
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select_expression: ($) => seq(
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"select",
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"(",
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choice($.select_value, $.soong_config_variable),
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",",
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$.select_cases,
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")",
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),
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select_value: ($) => seq(
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field("type", alias(
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choice("product_variable", "release_variable", "variant"),
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$.selection_type,
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)),
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"(",
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field("condition", $._string_literal),
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")",
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),
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soong_config_variable: ($) => seq(
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field("type", alias("soong_config_variable", $.selection_type)),
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"(",
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field(
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"condition",
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seq(
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field("namespace", $._string_literal),
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",",
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field("variable", $._string_literal),
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),
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),
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")",
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),
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select_cases: ($) => seq(
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"{",
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optional(trailingCommaSeparated($.select_case)),
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"}",
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),
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select_case: ($) => seq(
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field("pattern", choice(
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$._string_literal,
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alias("default", $.default),
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)),
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":",
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field("value", $._case_value)
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),
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_case_value: ($) => choice(
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alias("unset", $.unset),
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$._expr,
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),
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list_expression: ($) => seq(
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"[",
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optional(commaSeparated(field("element", $._expr))),
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"]",
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),
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map_expression: ($) => seq(
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"{",
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optional(commaSeparated(
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alias(field("property", $._colon_property), $.property)
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)),
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"}",
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),
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binary_expression: ($) => prec.left(seq(
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field("left", $._expr),
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field("operator", alias("+", $.operator)),
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field("right", $._expr),
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)),
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// }}}
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// Properties {{{
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_colon_property: ($) => seq(
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field("field", $.identifier),
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":",
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field("value", $._expr),
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),
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_equal_property: ($) => 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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