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require 'spec_helper'
RSpec.describe(Regexp::Expression::Subexpression) do
# check #ts, #te
include_examples 'parse', /abcd|ghij|klmn|pqur/,
[0] => [Alternation, ts: 0, te: 19],
[0, 0] => [Alternative, ts: 0, te: 4],
[0, 1] => [Alternative, ts: 5, te: 9],
[0, 2] => [Alternative, ts: 10, te: 14],
[0, 3] => [Alternative, ts: 15, te: 19]
# check #nesting_level
include_examples 'parse', /a(b(\d|[ef-g[h]]))/,
[0] => [Literal, to_s: 'a', nesting_level: 1],
[1, 0] => [Literal, to_s: 'b', nesting_level: 2],
[1, 1, 0] => [Alternation, to_s: '\d|[ef-g[h]]', nesting_level: 3],
[1, 1, 0, 0] => [Alternative, to_s: '\d', nesting_level: 4],
[1, 1, 0, 0, 0] => [CharacterType::Digit, to_s: '\d', nesting_level: 5],
[1, 1, 0, 1] => [Alternative, to_s: '[ef-g[h]]', nesting_level: 4],
[1, 1, 0, 1, 0] => [CharacterSet, to_s: '[ef-g[h]]', nesting_level: 5],
[1, 1, 0, 1, 0, 0] => [Literal, to_s: 'e', nesting_level: 6],
[1, 1, 0, 1, 0, 1] => [CharacterSet::Range, to_s: 'f-g', nesting_level: 6],
[1, 1, 0, 1, 0, 1, 0] => [Literal, to_s: 'f', nesting_level: 7],
[1, 1, 0, 1, 0, 2, 0] => [Literal, to_s: 'h', nesting_level: 7]
specify('#dig') do
root = RP.parse(/(((a)))/)
expect(root.dig(0).to_s).to eq '(((a)))'
expect(root.dig(0, 0, 0, 0).to_s).to eq 'a'
expect(root.dig(0, 0, 0, 0, 0)).to be_nil
expect(root.dig(3, 7)).to be_nil
end
end
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