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require_relative '../../spec_helper'
require_relative '../fixtures/classes'
describe "Regexps with grouping" do
it "support ()" do
/(a)/.match("a").to_a.should == ["a", "a"]
end
it "allows groups to be nested" do
md = /(hay(st)a)ck/.match('haystack')
md.to_a.should == ['haystack','haysta', 'st']
end
it "raises a SyntaxError when parentheses aren't balanced" do
-> { eval "/(hay(st)ack/" }.should raise_error(SyntaxError)
end
it "supports (?: ) (non-capturing group)" do
/(?:foo)(bar)/.match("foobar").to_a.should == ["foobar", "bar"]
# Parsing precedence
/(?:xdigit:)/.match("xdigit:").to_a.should == ["xdigit:"]
end
it "group names cannot start with digits or minus" do
-> { Regexp.new("(?<1a>a)") }.should raise_error(RegexpError)
-> { Regexp.new("(?<-a>a)") }.should raise_error(RegexpError)
end
it "ignore capture groups in line comments" do
/^
(a) # there is a capture group on this line
b # there is no capture group on this line (not even here)
$/x.match("ab").to_a.should == [ "ab", "a" ]
end
it "does not consider # inside a character class as a comment" do
# From https://github.com/rubocop/rubocop/blob/39fcf1c568/lib/rubocop/cop/utils/format_string.rb#L18
regexp = /
% (?<type>%) # line comment
| % (?<flags>(?-mix:[ #0+-]|(?-mix:(\d+)\$))*) (?#group comment)
(?:
(?: (?-mix:(?<width>(?-mix:\d+|(?-mix:\*(?-mix:(\d+)\$)?))))? (?-mix:\.(?<precision>(?-mix:\d+|(?-mix:\*(?-mix:(\d+)\$)?))))? (?-mix:<(?<name>\w+)>)?
| (?-mix:(?<width>(?-mix:\d+|(?-mix:\*(?-mix:(\d+)\$)?))))? (?-mix:<(?<name>\w+)>) (?-mix:\.(?<precision>(?-mix:\d+|(?-mix:\*(?-mix:(\d+)\$)?))))?
| (?-mix:<(?<name>\w+)>) (?<more_flags>(?-mix:[ #0+-]|(?-mix:(\d+)\$))*) (?-mix:(?<width>(?-mix:\d+|(?-mix:\*(?-mix:(\d+)\$)?))))? (?-mix:\.(?<precision>(?-mix:\d+|(?-mix:\*(?-mix:(\d+)\$)?))))?
) (?-mix:(?<type>[bBdiouxXeEfgGaAcps]))
| (?-mix:(?<width>(?-mix:\d+|(?-mix:\*(?-mix:(\d+)\$)?))))? (?-mix:\.(?<precision>(?-mix:\d+|(?-mix:\*(?-mix:(\d+)\$)?))))? (?-mix:\{(?<name>\w+)\})
)
/x
regexp.named_captures.should == {
"type" => [1, 13],
"flags" => [2],
"width" => [3, 6, 11, 14],
"precision" => [4, 8, 12, 15],
"name" => [5, 7, 9, 16],
"more_flags" => [10]
}
match = regexp.match("%6.3f")
match[:width].should == '6'
match[:precision].should == '3'
match[:type].should == 'f'
match.to_a.should == [ "%6.3f", nil, "", "6", "3"] + [nil] * 8 + ["f"] + [nil] * 3
end
end
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