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require "spec"
require "char/reader"
private def assert_invalid_byte_sequence(bytes)
reader = Char::Reader.new(String.new bytes)
reader.current_char.should eq(Char::REPLACEMENT)
reader.current_char_width.should eq(1)
reader.error.should eq(bytes[0])
end
describe "Char::Reader" do
it "iterates through empty string" do
reader = Char::Reader.new("")
reader.pos.should eq(0)
reader.current_char.ord.should eq(0)
reader.error.should be_nil
reader.has_next?.should be_false
expect_raises IndexError do
reader.next_char
end
end
it "iterates through string of size one" do
reader = Char::Reader.new("a")
reader.pos.should eq(0)
reader.current_char.should eq('a')
reader.has_next?.should be_true
reader.next_char.ord.should eq(0)
reader.has_next?.should be_false
expect_raises IndexError do
reader.next_char
end
end
it "iterates through chars" do
reader = Char::Reader.new("há日本語")
reader.pos.should eq(0)
reader.current_char.ord.should eq(104)
reader.has_next?.should be_true
reader.next_char.ord.should eq(225)
reader.pos.should eq(1)
reader.current_char.ord.should eq(225)
reader.next_char.ord.should eq(26085)
reader.next_char.ord.should eq(26412)
reader.next_char.ord.should eq(35486)
reader.has_next?.should be_true
reader.next_char.ord.should eq(0)
reader.has_next?.should be_false
expect_raises IndexError do
reader.next_char
end
end
it "peeks next char" do
reader = Char::Reader.new("há日本語")
reader.peek_next_char.ord.should eq(225)
end
it "sets pos" do
reader = Char::Reader.new("há日本語")
reader.pos = 1
reader.pos.should eq(1)
reader.current_char.ord.should eq(225)
end
it "is an Enumerable(Char)" do
reader = Char::Reader.new("abc")
sum = 0
reader.each do |char|
sum += char.ord
end.should be_nil
sum.should eq(294)
end
it "is an Enumerable(Char) but doesn't yield if empty" do
reader = Char::Reader.new("")
reader.each do |char|
fail "reader each shouldn't yield on empty string"
end.should be_nil
end
it "starts at end" do
reader = Char::Reader.new(at_end: "")
reader.pos.should eq(0)
reader.current_char.ord.should eq(0)
reader.has_previous?.should be_false
end
it "gets previous char (ascii)" do
reader = Char::Reader.new(at_end: "hello")
reader.pos.should eq(4)
reader.current_char.should eq('o')
reader.has_previous?.should be_true
reader.previous_char.should eq('l')
reader.previous_char.should eq('l')
reader.previous_char.should eq('e')
reader.previous_char.should eq('h')
reader.has_previous?.should be_false
expect_raises IndexError do
reader.previous_char
end
end
it "gets previous char (unicode)" do
reader = Char::Reader.new(at_end: "há日本語")
reader.pos.should eq(9)
reader.current_char.should eq('語')
reader.has_previous?.should be_true
reader.previous_char.should eq('本')
reader.previous_char.should eq('日')
reader.previous_char.should eq('á')
reader.previous_char.should eq('h')
reader.has_previous?.should be_false
end
it "starts at pos" do
reader = Char::Reader.new("há日本語", pos: 9)
reader.pos.should eq(9)
reader.current_char.should eq('語')
end
it "errors if 0x80 <= first_byte < 0xC2" do
assert_invalid_byte_sequence Bytes[0x80]
assert_invalid_byte_sequence Bytes[0xC1]
end
it "errors if (second_byte & 0xC0) != 0x80" do
assert_invalid_byte_sequence Bytes[0xd0]
end
it "errors if first_byte == 0xE0 && second_byte < 0xA0" do
assert_invalid_byte_sequence Bytes[0xe0, 0x9F, 0xA0]
end
it "errors if first_byte == 0xED && second_byte >= 0xA0" do
assert_invalid_byte_sequence Bytes[0xed, 0xB0, 0xA0]
end
it "errors if first_byte < 0xF0 && (third_byte & 0xC0) != 0x80" do
assert_invalid_byte_sequence Bytes[0xe0, 0xA0, 0]
end
it "errors if first_byte == 0xF0 && second_byte < 0x90" do
assert_invalid_byte_sequence Bytes[0xf0, 0x8F, 0xA0]
end
it "errors if first_byte == 0xF4 && second_byte >= 0x90" do
assert_invalid_byte_sequence Bytes[0xf4, 0x90, 0xA0]
end
it "errors if first_byte < 0xF5 && (fourth_byte & 0xC0) != 0x80" do
assert_invalid_byte_sequence Bytes[0xf4, 0x8F, 0xA0, 0]
end
it "errors if first_byte >= 0xF5" do
assert_invalid_byte_sequence Bytes[0xf5, 0x8F, 0xA0, 0xA0]
end
it "errors if second_byte is out of bounds" do
assert_invalid_byte_sequence Bytes[0xf4]
end
it "errors if third_byte is out of bounds" do
assert_invalid_byte_sequence Bytes[0xf4, 0x8f]
end
it "errors if fourth_byte is out of bounds" do
assert_invalid_byte_sequence Bytes[0xf4, 0x8f, 0xa0]
end
end
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