* Added test parse error in parseQuotedScalar
* Expecting to throw tests, previously trimmed string
* More details on issue: https://github.com/symfony/symfony/issues/4021
* Enforces single quote escaping when within string quotes
* Shortens the scope of the validation match
* Stricter matching rules
* Ensures double quoted strings are not parsed incorrectly
* Split quote matching into 2 types of quotes
* Separates single and double quotes
* Fixes intollerence for un escaped double quote
This addresses an obscure case where a hash string (actually a commit-ish, "686e444") was dumped to YAML as an unquoted string value. It was later parsed from YAML as an exponential numeric and changed to ".Inf".
Added support for the full range of escaped values in double quoted
strings in chapter 5 of the YAML 1.1 and 1.2 specs. The escaping
and unescaping strategies were factored out into separate classes to
keep the logic isolated.
Added examples from the spec to the unit tests for all escaped values.