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Max Brunsfeld
25b8facc6c
These tests are easier to write and maintain if the grammars are just JS, like grammars normally are. It doesn't slow the tests down significantly to shell out to `node` for each of these grammars.
32 lines
759 B
JavaScript
32 lines
759 B
JavaScript
// This grammar has an external scanner whose `scan` method needs to be able to check for the
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// validity of an *internal* token. This is done by including the names of that internal token
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// (`line_break`) in the grammar's `externals` field.
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module.exports = grammar({
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name: 'external_and_internal_tokens',
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externals: $ => [
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$.string,
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$.line_break,
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],
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extras: $ => [/\s/],
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rules: {
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statement: $ => seq(
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$._expression,
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$._expression,
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$.line_break,
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),
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_expression: $ => choice(
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$.string,
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$.variable,
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$.number,
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),
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variable: $ => /[a-z]+/,
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number: $ => /\d+/,
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line_break: $ => '\n',
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}
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}); |