What means the following extract on page 46 of TeXbook?
TeX goes into state
Sin case (c), or in case (b) with respect to a character of category 10 (space)
Does it mean that space must be skipped in case (b)? If yes, why the following example shows contrary?
\chardef\x=`\% \% a % case (b) - not skipped \x a % case (c) - skipped \bye
Also, does the "with respect to a character of category 10 (space)" part relate to "case (b)" only, or to both?
This is the full paragraph:
If TeX sees an escape character (category 0) in any state, it scans the entire control sequence name as follows. (a) If there are no more characters in the line, the name is empty (like
\csname\endcsname). Otherwise (b) if the next character is not of category 11 (letter), the name consists of that single symbol. Otherwise (c) the name consists of all letters beginning with the current one and ending just before the first nonletter, or at the end of the line. This name becomes a control sequence token. TeX goes into state
Sin case (c), or in case (b) with respect to a character of category 10 (space); otherwise TeX goes into state