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32 lines
826 B
JavaScript
32 lines
826 B
JavaScript
module.exports = grammar({
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name: 'context_predicate',
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rules: {
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source: $ => $._expression,
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_expression: $ => choice(
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$.identifier,
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$.not,
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$.and,
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$.or,
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$.equal,
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$.not_equal,
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$.parenthesized,
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),
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identifier: $ => /[A-Za-z0-9_-]+/,
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not: $ => prec(3, seq("!", field("expression", $._expression))),
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and: $ => prec.left(2, seq(field("left", $._expression), "&&", field("right", $._expression))),
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or: $ => prec.left(1, seq(field("left", $._expression), "||", field("right", $._expression))),
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equal: $ => seq(field("left", $.identifier), "==", field("right", $.identifier)),
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not_equal: $ => seq(field("left", $.identifier), "!=", field("right", $.identifier)),
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parenthesized: $ => seq("(", field("expression", $._expression), ")"),
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}
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});
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