325 lines
14 KiB
Ruby
325 lines
14 KiB
Ruby
module Imbecile
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class Regex
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RSpec.describe Parser do
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it "parses an empty expression" do
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parser = Parser.new("")
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expect(parser.unit).to be_a Parser::AlternatesUnit
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expect(parser.unit.alternates.size).to eq 1
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expect(parser.unit.alternates[0].size).to eq 0
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end
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it "parses a single character unit expression" do
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parser = Parser.new("a")
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expect(parser.unit).to be_a Parser::AlternatesUnit
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expect(parser.unit.alternates.size).to eq 1
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expect(parser.unit.alternates[0]).to be_a Parser::SequenceUnit
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seq_unit = parser.unit.alternates[0]
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expect(seq_unit.size).to eq 1
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expect(seq_unit[0]).to be_a Parser::CharacterUnit
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end
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it "parses a group with a single character unit expression" do
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parser = Parser.new("(a)")
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expect(parser.unit).to be_a Parser::AlternatesUnit
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expect(parser.unit.alternates.size).to eq 1
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expect(parser.unit.alternates[0]).to be_a Parser::SequenceUnit
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seq_unit = parser.unit.alternates[0]
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expect(seq_unit.size).to eq 1
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expect(seq_unit[0]).to be_a Parser::AlternatesUnit
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alt_unit = seq_unit[0]
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expect(alt_unit.alternates.size).to eq 1
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expect(alt_unit.alternates[0]).to be_a Parser::SequenceUnit
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expect(alt_unit.alternates[0][0]).to be_a Parser::CharacterUnit
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end
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it "parses a *" do
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parser = Parser.new("a*")
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expect(parser.unit).to be_a Parser::AlternatesUnit
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expect(parser.unit.alternates.size).to eq 1
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expect(parser.unit.alternates[0]).to be_a Parser::SequenceUnit
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seq_unit = parser.unit.alternates[0]
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expect(seq_unit.size).to eq 1
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expect(seq_unit[0]).to be_a Parser::MultiplicityUnit
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m_unit = seq_unit[0]
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expect(m_unit.min_count).to eq 0
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expect(m_unit.max_count).to be_nil
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expect(m_unit.unit).to be_a Parser::CharacterUnit
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end
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it "parses a +" do
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parser = Parser.new("a+")
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expect(parser.unit).to be_a Parser::AlternatesUnit
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expect(parser.unit.alternates.size).to eq 1
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expect(parser.unit.alternates[0]).to be_a Parser::SequenceUnit
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seq_unit = parser.unit.alternates[0]
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expect(seq_unit.size).to eq 1
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expect(seq_unit[0]).to be_a Parser::MultiplicityUnit
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m_unit = seq_unit[0]
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expect(m_unit.min_count).to eq 1
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expect(m_unit.max_count).to be_nil
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expect(m_unit.unit).to be_a Parser::CharacterUnit
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end
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it "parses a ?" do
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parser = Parser.new("a?")
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expect(parser.unit).to be_a Parser::AlternatesUnit
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expect(parser.unit.alternates.size).to eq 1
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expect(parser.unit.alternates[0]).to be_a Parser::SequenceUnit
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seq_unit = parser.unit.alternates[0]
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expect(seq_unit.size).to eq 1
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expect(seq_unit[0]).to be_a Parser::MultiplicityUnit
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m_unit = seq_unit[0]
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expect(m_unit.min_count).to eq 0
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expect(m_unit.max_count).to eq 1
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expect(m_unit.unit).to be_a Parser::CharacterUnit
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end
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it "parses a multiplicity count" do
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parser = Parser.new("a{5}")
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expect(parser.unit).to be_a Parser::AlternatesUnit
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expect(parser.unit.alternates.size).to eq 1
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expect(parser.unit.alternates[0]).to be_a Parser::SequenceUnit
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seq_unit = parser.unit.alternates[0]
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expect(seq_unit.size).to eq 1
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expect(seq_unit[0]).to be_a Parser::MultiplicityUnit
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m_unit = seq_unit[0]
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expect(m_unit.min_count).to eq 5
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expect(m_unit.max_count).to eq 5
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expect(m_unit.unit).to be_a Parser::CharacterUnit
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end
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it "parses a minimum-only multiplicity count" do
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parser = Parser.new("a{5,}")
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expect(parser.unit).to be_a Parser::AlternatesUnit
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expect(parser.unit.alternates.size).to eq 1
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expect(parser.unit.alternates[0]).to be_a Parser::SequenceUnit
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seq_unit = parser.unit.alternates[0]
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expect(seq_unit.size).to eq 1
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expect(seq_unit[0]).to be_a Parser::MultiplicityUnit
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m_unit = seq_unit[0]
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expect(m_unit.min_count).to eq 5
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expect(m_unit.max_count).to be_nil
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expect(m_unit.unit).to be_a Parser::CharacterUnit
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end
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it "parses a minimum and maximum multiplicity count" do
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parser = Parser.new("a{5,8}")
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expect(parser.unit).to be_a Parser::AlternatesUnit
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expect(parser.unit.alternates.size).to eq 1
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expect(parser.unit.alternates[0]).to be_a Parser::SequenceUnit
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seq_unit = parser.unit.alternates[0]
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expect(seq_unit.size).to eq 1
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expect(seq_unit[0]).to be_a Parser::MultiplicityUnit
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m_unit = seq_unit[0]
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expect(m_unit.min_count).to eq 5
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expect(m_unit.max_count).to eq 8
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expect(m_unit.unit).to be_a Parser::CharacterUnit
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expect(m_unit.unit.code_point).to eq "a".ord
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end
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it "parses an escaped *" do
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parser = Parser.new("a\\*")
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expect(parser.unit).to be_a Parser::AlternatesUnit
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expect(parser.unit.alternates.size).to eq 1
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expect(parser.unit.alternates[0]).to be_a Parser::SequenceUnit
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seq_unit = parser.unit.alternates[0]
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expect(seq_unit.size).to eq 2
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expect(seq_unit[0]).to be_a Parser::CharacterUnit
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expect(seq_unit[0].code_point).to eq "a".ord
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expect(seq_unit[1]).to be_a Parser::CharacterUnit
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expect(seq_unit[1].code_point).to eq "*".ord
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end
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it "parses an escaped +" do
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parser = Parser.new("a\\+")
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expect(parser.unit).to be_a Parser::AlternatesUnit
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expect(parser.unit.alternates.size).to eq 1
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expect(parser.unit.alternates[0]).to be_a Parser::SequenceUnit
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seq_unit = parser.unit.alternates[0]
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expect(seq_unit.size).to eq 2
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expect(seq_unit[0]).to be_a Parser::CharacterUnit
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expect(seq_unit[0].code_point).to eq "a".ord
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expect(seq_unit[1]).to be_a Parser::CharacterUnit
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expect(seq_unit[1].code_point).to eq "+".ord
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end
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it "parses an escaped \\" do
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parser = Parser.new("\\\\d")
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expect(parser.unit).to be_a Parser::AlternatesUnit
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expect(parser.unit.alternates.size).to eq 1
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expect(parser.unit.alternates[0]).to be_a Parser::SequenceUnit
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seq_unit = parser.unit.alternates[0]
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expect(seq_unit.size).to eq 2
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expect(seq_unit[0]).to be_a Parser::CharacterUnit
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expect(seq_unit[0].code_point).to eq "\\".ord
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expect(seq_unit[1]).to be_a Parser::CharacterUnit
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expect(seq_unit[1].code_point).to eq "d".ord
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end
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it "parses a character class" do
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parser = Parser.new("[a-z_]")
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expect(parser.unit).to be_a Parser::AlternatesUnit
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expect(parser.unit.alternates.size).to eq 1
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expect(parser.unit.alternates[0]).to be_a Parser::SequenceUnit
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seq_unit = parser.unit.alternates[0]
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expect(seq_unit.size).to eq 1
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expect(seq_unit[0]).to be_a Parser::CharacterClassUnit
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ccu = seq_unit[0]
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expect(ccu.negate).to be_falsey
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expect(ccu.size).to eq 2
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expect(ccu[0]).to be_a Parser::CharacterRangeUnit
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expect(ccu[0].min_code_point).to eq "a".ord
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expect(ccu[0].max_code_point).to eq "z".ord
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expect(ccu[1]).to be_a Parser::CharacterUnit
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expect(ccu[1].code_point).to eq "_".ord
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end
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it "parses a negated character class" do
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parser = Parser.new("[^xyz]")
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expect(parser.unit).to be_a Parser::AlternatesUnit
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expect(parser.unit.alternates.size).to eq 1
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expect(parser.unit.alternates[0]).to be_a Parser::SequenceUnit
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seq_unit = parser.unit.alternates[0]
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expect(seq_unit.size).to eq 1
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expect(seq_unit[0]).to be_a Parser::CharacterClassUnit
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ccu = seq_unit[0]
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expect(ccu.negate).to be_truthy
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expect(ccu.size).to eq 3
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expect(ccu[0]).to be_a Parser::CharacterUnit
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expect(ccu[0].code_point).to eq "x".ord
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end
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it "parses - as a plain character at beginning of a character class" do
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parser = Parser.new("[-9]")
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expect(parser.unit).to be_a Parser::AlternatesUnit
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expect(parser.unit.alternates.size).to eq 1
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expect(parser.unit.alternates[0]).to be_a Parser::SequenceUnit
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seq_unit = parser.unit.alternates[0]
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expect(seq_unit.size).to eq 1
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expect(seq_unit[0]).to be_a Parser::CharacterClassUnit
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ccu = seq_unit[0]
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expect(ccu.size).to eq 2
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expect(ccu[0]).to be_a Parser::CharacterUnit
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expect(ccu[0].code_point).to eq "-".ord
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end
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it "parses - as a plain character at end of a character class" do
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parser = Parser.new("[0-]")
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expect(parser.unit).to be_a Parser::AlternatesUnit
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expect(parser.unit.alternates.size).to eq 1
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expect(parser.unit.alternates[0]).to be_a Parser::SequenceUnit
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seq_unit = parser.unit.alternates[0]
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expect(seq_unit.size).to eq 1
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expect(seq_unit[0]).to be_a Parser::CharacterClassUnit
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ccu = seq_unit[0]
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expect(ccu.size).to eq 2
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expect(ccu[0]).to be_a Parser::CharacterUnit
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expect(ccu[0].code_point).to eq "0".ord
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expect(ccu[1]).to be_a Parser::CharacterUnit
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expect(ccu[1].code_point).to eq "-".ord
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end
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it "parses - as a plain character at beginning of a negated character class" do
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parser = Parser.new("[^-9]")
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expect(parser.unit).to be_a Parser::AlternatesUnit
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expect(parser.unit.alternates.size).to eq 1
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expect(parser.unit.alternates[0]).to be_a Parser::SequenceUnit
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seq_unit = parser.unit.alternates[0]
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expect(seq_unit.size).to eq 1
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expect(seq_unit[0]).to be_a Parser::CharacterClassUnit
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ccu = seq_unit[0]
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expect(ccu.negate).to be_truthy
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expect(ccu.size).to eq 2
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expect(ccu[0]).to be_a Parser::CharacterUnit
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expect(ccu[0].code_point).to eq "-".ord
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end
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it "parses . as a plain character in a negated character class" do
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parser = Parser.new("[.]")
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expect(parser.unit).to be_a Parser::AlternatesUnit
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expect(parser.unit.alternates.size).to eq 1
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expect(parser.unit.alternates[0]).to be_a Parser::SequenceUnit
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seq_unit = parser.unit.alternates[0]
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expect(seq_unit.size).to eq 1
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expect(seq_unit[0]).to be_a Parser::CharacterClassUnit
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ccu = seq_unit[0]
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expect(ccu.negate).to be_falsey
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expect(ccu.size).to eq 1
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expect(ccu[0]).to be_a Parser::CharacterUnit
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expect(ccu[0].code_point).to eq ".".ord
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end
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it "parses - as a plain character when escaped in middle of character class" do
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parser = Parser.new("[0\\-9]")
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expect(parser.unit).to be_a Parser::AlternatesUnit
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expect(parser.unit.alternates.size).to eq 1
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expect(parser.unit.alternates[0]).to be_a Parser::SequenceUnit
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seq_unit = parser.unit.alternates[0]
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expect(seq_unit.size).to eq 1
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expect(seq_unit[0]).to be_a Parser::CharacterClassUnit
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ccu = seq_unit[0]
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expect(ccu.negate).to be_falsey
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expect(ccu.size).to eq 3
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expect(ccu[0]).to be_a Parser::CharacterUnit
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expect(ccu[0].code_point).to eq "0".ord
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expect(ccu[1]).to be_a Parser::CharacterUnit
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expect(ccu[1].code_point).to eq "-".ord
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expect(ccu[2]).to be_a Parser::CharacterUnit
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expect(ccu[2].code_point).to eq "9".ord
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end
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it "parses alternates" do
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parser = Parser.new("ab|c")
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expect(parser.unit).to be_a Parser::AlternatesUnit
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expect(parser.unit.alternates.size).to eq 2
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expect(parser.unit.alternates[0]).to be_a Parser::SequenceUnit
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expect(parser.unit.alternates[1]).to be_a Parser::SequenceUnit
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expect(parser.unit.alternates[0].size).to eq 2
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expect(parser.unit.alternates[1].size).to eq 1
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end
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it "parses something complex" do
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parser = Parser.new("(a|)*|[^^]|\\|v|[x-y]+")
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expect(parser.unit).to be_a Parser::AlternatesUnit
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expect(parser.unit.alternates.size).to eq 4
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expect(parser.unit.alternates[0]).to be_a Parser::SequenceUnit
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expect(parser.unit.alternates[0].size).to eq 1
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expect(parser.unit.alternates[0][0]).to be_a Parser::MultiplicityUnit
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expect(parser.unit.alternates[0][0].min_count).to eq 0
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expect(parser.unit.alternates[0][0].max_count).to be_nil
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expect(parser.unit.alternates[0][0].unit).to be_a Parser::AlternatesUnit
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expect(parser.unit.alternates[0][0].unit.alternates.size).to eq 2
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expect(parser.unit.alternates[0][0].unit.alternates[0]).to be_a Parser::SequenceUnit
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expect(parser.unit.alternates[0][0].unit.alternates[0].size).to eq 1
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expect(parser.unit.alternates[0][0].unit.alternates[0][0]).to be_a Parser::CharacterUnit
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expect(parser.unit.alternates[0][0].unit.alternates[1]).to be_a Parser::SequenceUnit
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expect(parser.unit.alternates[0][0].unit.alternates[1].size).to eq 0
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expect(parser.unit.alternates[1]).to be_a Parser::SequenceUnit
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expect(parser.unit.alternates[1].size).to eq 1
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expect(parser.unit.alternates[1][0]).to be_a Parser::CharacterClassUnit
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expect(parser.unit.alternates[1][0].negate).to be_truthy
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expect(parser.unit.alternates[1][0].size).to eq 1
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expect(parser.unit.alternates[1][0][0]).to be_a Parser::CharacterUnit
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expect(parser.unit.alternates[2]).to be_a Parser::SequenceUnit
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expect(parser.unit.alternates[2].size).to eq 2
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expect(parser.unit.alternates[2][0]).to be_a Parser::CharacterUnit
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expect(parser.unit.alternates[2][0].code_point).to eq "|".ord
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expect(parser.unit.alternates[2][1]).to be_a Parser::CharacterUnit
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expect(parser.unit.alternates[2][1].code_point).to eq "v".ord
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expect(parser.unit.alternates[3]).to be_a Parser::SequenceUnit
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expect(parser.unit.alternates[3].size).to eq 1
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expect(parser.unit.alternates[3][0]).to be_a Parser::MultiplicityUnit
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expect(parser.unit.alternates[3][0].min_count).to eq 1
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expect(parser.unit.alternates[3][0].max_count).to be_nil
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expect(parser.unit.alternates[3][0].unit).to be_a Parser::CharacterClassUnit
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expect(parser.unit.alternates[3][0].unit.size).to eq 1
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expect(parser.unit.alternates[3][0].unit[0]).to be_a Parser::CharacterRangeUnit
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expect(parser.unit.alternates[3][0].unit[0].min_code_point).to eq "x".ord
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expect(parser.unit.alternates[3][0].unit[0].max_code_point).to eq "y".ord
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end
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end
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end
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end
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