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require 'spec_helper'
RSpec.describe('Conditional parsing') do
include_examples 'parse', /(?<A>a)(?(<A>)T|F)/,
[1] => [:conditional, :open, Conditional::Expression, to_s: '(?(<A>)T|F)', reference: 'A'],
[1, 0] => [:conditional, :condition, Conditional::Condition, to_s: '(<A>)', reference: 'A'],
[1, 1] => [:expression, :sequence, Conditional::Branch, to_s: 'T'],
[1, 1, 0] => [:literal, text: 'T'],
[1, 2] => [:expression, :sequence, Conditional::Branch, to_s: 'F'],
[1, 2, 0] => [:literal, text: 'F']
include_examples 'parse', /(a)(?(1)T|F)/,
[1] => [:conditional, :open, Conditional::Expression, to_s: '(?(1)T|F)', reference: 1],
[1, 0] => [:conditional, :condition, Conditional::Condition, to_s: '(1)', reference: 1],
[1, 1] => [:expression, :sequence, Conditional::Branch, to_s: 'T'],
[1, 1, 0] => [:literal, text: 'T'],
[1, 2] => [:expression, :sequence, Conditional::Branch, to_s: 'F'],
[1, 2, 0] => [:literal, text: 'F']
include_examples 'parse', /(foo)(?(1)\d+|(\w)){42}/,
[1] => [Conditional::Expression, quantified?: true, to_s: '(?(1)\d+|(\w)){42}'],
[1, 0] => [Conditional::Condition, quantified?: false],
[1, 1] => [Conditional::Branch, quantified?: false],
[1, 1, 0] => [:digit, quantified?: true, to_s: '\d+'],
[1, 2] => [Conditional::Branch, quantified?: false]
# test nested and mixed with alternations
include_examples 'parse', <<-EOS.gsub(/\s/, ''),
(
(a)
|
(b)
|
(
(
?(2)
(c(d|e)+)?
|
(
?(3)
f
|
(
?(4)
(g|(h)(i))
)
)
)
)
)
EOS
[0] => [Group::Capture, count: 1],
[0, 0] => [Alternation, count: 3],
[0, 0, 2] => [Alternative, count: 1],
[0, 0, 2, 0] => [Group::Capture, count: 1],
[0, 0, 2, 0, 0] => [Conditional::Expression, count: 3, conditional_level: 0],
[0, 0, 2, 0, 0, 0] => [Conditional::Condition, to_s: '(2)', conditional_level: 1],
[0, 0, 2, 0, 0, 1] => [Conditional::Branch, to_s: '(c(d|e)+)?', conditional_level: 1],
[0, 0, 2, 0, 0, 2] => [Conditional::Branch, to_s: '(?(3)f|(?(4)(g|(h)(i))))', conditional_level: 1],
[0, 0, 2, 0, 0, 2, 0] => [Conditional::Expression, count: 3, conditional_level: 1],
[0, 0, 2, 0, 0, 2, 0, 0] => [Conditional::Condition, to_s: '(3)', conditional_level: 2],
[0, 0, 2, 0, 0, 2, 0, 1] => [Conditional::Branch, count: 1, to_s: 'f', conditional_level: 2],
[0, 0, 2, 0, 0, 2, 0, 1, 0] => [Literal, text: 'f', conditional_level: 2]
# test empty branch
include_examples 'parse', /(?<A>a)(?(<A>)T|)/,
[1] => [Conditional::Expression, count: 3, to_s: '(?(<A>)T|)'],
[1, 2] => [Conditional::Branch, to_s: '']
end
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