Stage 3 of the faithful libyaml scanner port, continued. Translates fetch_flow_scalar and scan_flow_scalar: single- and double-quoted scalars with line-break folding (a single break folds to a space, blank lines to newlines), the single-quote '' escape, double-quoted backslash escapes (the full \0 \a \b \t \n \v \f \r \e space \" / \ \N \_ \L \P table plus \xXX/\uXXXX/\UXXXXXXXX hex), and the escaped end-of-line continuation that suppresses the break. Escapes are decoded to Unicode scalars directly rather than UTF-8 bytes. Unit-tested for the escaped single quote, the escape table including a hex unicode escape, and multi-line folding. The remaining unported fetchers are block scalars, anchors, tags, and directives. 310 tests, no regression.
Mihaela Mihaljevic
4e7ca8fcb2