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# frozen_string_literal: true
require 'spec_helper'
RSpec.describe('Subexpression#traverse') do
specify('Subexpression#traverse') do
root = RP.parse(/a(b(c(d)))|g[h-i]j|klmn/)
enters = 0
visits = 0
exits = 0
root.traverse do |event, _exp, _index|
enters = (enters + 1) if event == :enter
visits = (visits + 1) if event == :visit
exits = (exits + 1) if event == :exit
end
expect(enters).to eq 9
expect(enters).to eq exits
expect(visits).to eq 9
end
specify('Subexpression#traverse including self') do
root = RP.parse(/a(b(c(d)))|g[h-i]j|klmn/)
enters = 0
visits = 0
exits = 0
root.traverse(true) do |event, _exp, _index|
enters = (enters + 1) if event == :enter
visits = (visits + 1) if event == :visit
exits = (exits + 1) if event == :exit
end
expect(enters).to eq 10
expect(enters).to eq exits
expect(visits).to eq 9
end
specify('Subexpression#traverse without a block') do
root = RP.parse(/abc/)
enum = root.traverse
expect(enum).to be_a(Enumerator)
event, expr, idx = enum.next
expect(event).to eq(:visit)
expect(expr).to be_a(Regexp::Expression::Literal)
expect(idx).to eq(0)
end
specify('Subexpression#walk alias') do
root = RP.parse(/abc/)
expect(root).to respond_to(:walk)
end
specify('Subexpression#each_expression') do
root = RP.parse(/a(?x:b(c))|g[h-k]/)
count = 0
root.each_expression { count += 1 }
expect(count).to eq 13
end
specify('Subexpression#each_expression including self') do
root = RP.parse(/a(?x:b(c))|g[h-k]/)
count = 0
root.each_expression(true) { count += 1 }
expect(count).to eq 14
end
specify('Subexpression#each_expression with block arity 1') do
root = RP.parse(/a(b)c/)
texts = []
root.each_expression { |exp| texts << exp.text }
expect(texts).to eq ['a', '(', 'b', 'c']
end
specify('Subexpression#each_expression indices') do
root = RP.parse(/a(b)c/)
indices = []
root.each_expression { |_exp, index| (indices << index) }
expect(indices).to eq [0, 1, 0, 2]
end
specify('Subexpression#each_expression indices including self') do
root = RP.parse(/a(b)c/)
indices = []
root.each_expression(true) { |_exp, index| (indices << index) }
expect(indices).to eq [0, 0, 1, 0, 2]
end
specify('Subexpression#each_expression without a block') do
root = RP.parse(/abc/)
enum = root.each_expression
expect(enum).to be_a(Enumerator)
expr, idx = enum.next
expect(expr).to be_a(Regexp::Expression::Literal)
expect(idx).to eq(0)
end
specify('Subexpression#flat_map without block') do
root = RP.parse(/a(b([c-e]+))?/)
array = root.flat_map
expect(array).to be_instance_of(Array)
expect(array.length).to eq 8
array.each do |item|
expect(item).to be_instance_of(Array)
expect(item.length).to eq 2
expect(item.first).to be_a(Regexp::Expression::Base)
expect(item.last).to be_a(Integer)
end
end
specify('Subexpression#flat_map without block including self') do
root = RP.parse(/a(b([c-e]+))?/)
array = root.flat_map(true)
expect(array).to be_instance_of(Array)
expect(array.length).to eq 9
end
specify('Subexpression#flat_map expressions for block with arity 1') do
root = RP.parse(/a(b(c(d)))/)
result = root.flat_map { |exp| exp.text if exp.terminal? }.compact
expect(result).to eq ['a', 'b', 'c', 'd']
end
specify('Subexpression#flat_map indices') do
root = RP.parse(/a(b([c-e]+))?f*g/)
indices = root.flat_map { |_exp, index| index }
expect(indices).to eq [0, 1, 0, 1, 0, 0, 0, 1, 2, 3]
end
specify('Subexpression#flat_map indices including self') do
root = RP.parse(/a(b([c-e]+))?f*g/)
indices = root.flat_map(true) { |_exp, index| index }
expect(indices).to eq [0, 0, 1, 0, 1, 0, 0, 0, 1, 2, 3]
end
specify('Subexpression#flat_map expressions') do
root = RP.parse(/a(b(c(d)))/)
levels = root.flat_map { |exp| [exp.level, exp.text] if exp.terminal? }.compact
expect(levels).to eq [[0, 'a'], [1, 'b'], [2, 'c'], [3, 'd']]
end
specify('Subexpression#flat_map expressions including self') do
root = RP.parse(/a(b(c(d)))/)
levels = root.flat_map(true) { |exp| [exp.level, exp.to_s] }.compact
expect(levels).to eq [[0, 'a(b(c(d)))'], [0, 'a'], [0, '(b(c(d)))'], [1, 'b'], [1, '(c(d))'], [2, 'c'], [2, '(d)'], [3, 'd']]
end
end
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