Block scalar texts are parsed incorrectly: The final line break should be part of the scalar.

[mmueller2012]

The YAML spec states that the final line break is part of a block scalar unless strip - is used as a chomping mode. The parser however treats the final line break as whitespace and assigns it to a different node.

Here is an example to reproduce the issue:

a: |
  hello
  world
b: |
  hello
  world

The parser generates the following output:

[email protected]
  [email protected]
    [email protected]
      [email protected]
        [email protected]
          [email protected]
            [email protected]
              [email protected] "a"
          [email protected] ":"
          [email protected] " "
          [email protected]
            [email protected]
              [email protected]
                [email protected] "|"
                [email protected] "\n  hello\n  world"
        [email protected] "\n" <-----
        [email protected]
          [email protected]
            [email protected]
              [email protected] "b"
          [email protected] ":"
          [email protected] " "
          [email protected]
            [email protected]
              [email protected]
                [email protected] "|"
                [email protected] "\n  hello\n  world"
  [email protected] "\n" <-----

The incorrectly parsed line breaks are marked with <-----. They should be part of the BLOCK_SCALAR_TEXT instead.

I tried to fix it myself, but it turned out to be quite challenging. Parsing the line break as part of BLOCK_SCALAR_TEXT breaks the parent rules which expect the line break as a separator, e.g. the block_map parsing function.