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# encoding: utf-8
RSpec.describe RE2::Scanner do
describe "#regexp" do
it "returns the original pattern for the scanner" do
re = RE2::Regexp.new('(\w+)')
scanner = re.scan("It is a truth")
expect(scanner.regexp).to equal(re)
end
end
describe "#string" do
it "returns the original text for the scanner" do
re = RE2::Regexp.new('(\w+)')
text = "It is a truth"
scanner = re.scan(text)
expect(scanner.string).to equal(text)
end
end
describe "#scan" do
it "returns the next array of matches", :aggregate_failures do
r = RE2::Regexp.new('(\w+)')
scanner = r.scan("It is a truth universally acknowledged")
expect(scanner.scan).to eq(["It"])
expect(scanner.scan).to eq(["is"])
expect(scanner.scan).to eq(["a"])
expect(scanner.scan).to eq(["truth"])
expect(scanner.scan).to eq(["universally"])
expect(scanner.scan).to eq(["acknowledged"])
expect(scanner.scan).to be_nil
end
it "supports scanning inputs with null bytes", :aggregate_failures do
r = RE2::Regexp.new("(\\w\0\\w)")
scanner = r.scan("a\0b c\0d e\0f")
expect(scanner.scan).to eq(["a\0b"])
expect(scanner.scan).to eq(["c\0d"])
expect(scanner.scan).to eq(["e\0f"])
expect(scanner.scan).to be_nil
end
it "returns UTF-8 matches if the pattern is UTF-8" do
r = RE2::Regexp.new('(\w+)')
scanner = r.scan("It")
matches = scanner.scan
expect(matches.first.encoding).to eq(Encoding::UTF_8)
end
it "returns ISO-8859-1 matches if the pattern is not UTF-8" do
r = RE2::Regexp.new('(\w+)', utf8: false)
scanner = r.scan("It")
matches = scanner.scan
expect(matches.first.encoding).to eq(Encoding::ISO_8859_1)
end
it "returns multiple capturing groups at a time", :aggregate_failures do
r = RE2::Regexp.new('(\w+) (\w+)')
scanner = r.scan("It is a truth universally acknowledged")
expect(scanner.scan).to eq(["It", "is"])
expect(scanner.scan).to eq(["a", "truth"])
expect(scanner.scan).to eq(["universally", "acknowledged"])
expect(scanner.scan).to be_nil
end
it "returns an empty array if there are no capturing groups" do
r = RE2::Regexp.new('\w+')
scanner = r.scan("Foo bar")
expect(scanner.scan).to eq([])
end
it "returns nil if there is no match" do
r = RE2::Regexp.new('\d+')
scanner = r.scan("Foo bar")
expect(scanner.scan).to be_nil
end
it "returns nil if the regexp is invalid" do
r = RE2::Regexp.new('???', log_errors: false)
scanner = r.scan("Foo bar")
expect(scanner.scan).to be_nil
end
it "returns an empty array if the input is empty", :aggregate_failures do
r = RE2::Regexp.new("")
scanner = r.scan("")
expect(scanner.scan).to eq([])
expect(scanner.scan).to be_nil
end
it "returns an array of nil with an empty input and capture", :aggregate_failures do
r = RE2::Regexp.new("()")
scanner = r.scan("")
expect(scanner.scan).to eq([nil])
expect(scanner.scan).to be_nil
end
it "returns an empty array for every match if the pattern is empty", :aggregate_failures do
r = RE2::Regexp.new("")
scanner = r.scan("Foo")
expect(scanner.scan).to eq([])
expect(scanner.scan).to eq([])
expect(scanner.scan).to eq([])
expect(scanner.scan).to eq([])
expect(scanner.scan).to be_nil
end
it "returns an array of nil if the pattern is an empty capturing group", :aggregate_failures do
r = RE2::Regexp.new("()")
scanner = r.scan("Foo")
expect(scanner.scan).to eq([nil])
expect(scanner.scan).to eq([nil])
expect(scanner.scan).to eq([nil])
expect(scanner.scan).to eq([nil])
expect(scanner.scan).to be_nil
end
it "returns array of nils with multiple empty capturing groups", :aggregate_failures do
r = RE2::Regexp.new("()()()")
scanner = r.scan("Foo")
expect(scanner.scan).to eq([nil, nil, nil])
expect(scanner.scan).to eq([nil, nil, nil])
expect(scanner.scan).to eq([nil, nil, nil])
expect(scanner.scan).to eq([nil, nil, nil])
expect(scanner.scan).to be_nil
end
it "supports empty groups with multibyte characters", :aggregate_failures do
r = RE2::Regexp.new("()€")
scanner = r.scan("€")
expect(scanner.scan).to eq([nil])
expect(scanner.scan).to be_nil
end
it "raises a Type Error if given input that can't be coerced to a String" do
r = RE2::Regexp.new('(\w+)')
expect { r.scan(0) }.to raise_error(TypeError)
end
it "accepts input that can be coerced to a String", :aggregate_failures do
r = RE2::Regexp.new('(\w+)')
scanner = r.scan(StringLike.new("Hello world"))
expect(scanner.scan).to eq(["Hello"])
expect(scanner.scan).to eq(["world"])
expect(scanner.scan).to be_nil
end
end
it "is enumerable" do
r = RE2::Regexp.new('(\d)')
scanner = r.scan("There are 1 some 2 numbers 3")
expect(scanner).to be_a(Enumerable)
end
describe "#each" do
it "yields each match" do
r = RE2::Regexp.new('(\d)')
scanner = r.scan("There are 1 some 2 numbers 3")
expect { |b| scanner.each(&b) }.to yield_successive_args(["1"], ["2"], ["3"])
end
it "returns an enumerator when not given a block" do
r = RE2::Regexp.new('(\d)')
scanner = r.scan("There are 1 some 2 numbers 3")
expect(scanner.each).to be_a(Enumerator)
end
end
describe "#rewind" do
it "resets any consumption", :aggregate_failures do
r = RE2::Regexp.new('(\d)')
scanner = r.scan("There are 1 some 2 numbers 3")
expect(scanner.to_enum.first).to eq(["1"])
expect(scanner.to_enum.first).to eq(["2"])
scanner.rewind
expect(scanner.to_enum.first).to eq(["1"])
end
it "supports inputs with null bytes", :aggregate_failures do
r = RE2::Regexp.new("(\\w\0\\w)")
scanner = r.scan("a\0b c\0d")
expect(scanner.to_enum.first).to eq(["a\0b"])
expect(scanner.to_enum.first).to eq(["c\0d"])
scanner.rewind
expect(scanner.to_enum.first).to eq(["a\0b"])
end
it "resets the eof? check", :aggregate_failures do
r = RE2::Regexp.new('(\d)')
scanner = r.scan("1")
scanner.scan
expect(scanner).to be_eof
scanner.rewind
expect(scanner).not_to be_eof
end
end
describe "#eof?" do
it "returns false if the input has not been consumed" do
r = RE2::Regexp.new('(\d)')
scanner = r.scan("1 2 3")
expect(scanner).not_to be_eof
end
it "returns true if the input has been consumed" do
r = RE2::Regexp.new('(\d)')
scanner = r.scan("1")
scanner.scan
expect(scanner).to be_eof
end
it "returns false if no match is made" do
r = RE2::Regexp.new('(\d)')
scanner = r.scan("a")
scanner.scan
expect(scanner).not_to be_eof
end
it "returns false with an empty input that has not been scanned" do
r = RE2::Regexp.new("")
scanner = r.scan("")
expect(scanner).not_to be_eof
end
it "returns false with an empty input that has not been matched" do
r = RE2::Regexp.new('(\d)')
scanner = r.scan("")
scanner.scan
expect(scanner).not_to be_eof
end
it "returns true with an empty input that has been matched" do
r = RE2::Regexp.new("")
scanner = r.scan("")
scanner.scan
expect(scanner).to be_eof
end
end
end
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