This is to fix the problem where `break` is dynamic, not lexical.
With this it should be possible to do this sort of thing:
label $break | inputs | if ... then $break|error else . end
This is a backwards-incompatible change for master, but the previous
`break` hadn't shipped yet.
Still needed:
- testing
Streaming means that outputs are produced as soon as possible. With the
`foreach` syntax one can write programs which reduce portions of the
streaming parse of a large input (reduce into proper JSON values, for
example), and discard the rest, processing incrementally.
This:
$ jq -c --stream .
should produce the same output as this:
$ jq -c '. as $dot | path(..) as $p | $dot | getpath($p) | [$p,.]'
The output of `jq --stream .` should be a sequence of`[[<path>],<leaf>]`
and `[[<path>]]` values. The latter indicate that the array/object at
that path ended.
Scalars and empty arrays and objects are leaf values for this purpose.
For example, a truncated input produces a path as soon as possible, then
later the error:
$ printf '[0,\n'|./jq -c --stream .
[[0],0]
parse error: Unfinished JSON term at EOF at line 3, column 0
$
Make XPath-like `//a/b` recursive structure traversal easier in jq,
which then becomes:
..|.a?.b?
The `?` operator suppresses errors about . not being an array or object.
The `..` operator is equivalent to calling the new `recurse_down`
built-in, which in turn is equivalent to
recurse(.[]?)
Note that `..a` is not supported; neither is `...a`. That could be add
added, but it doesn't seem worth the trouble of saving the need to type
a '|'.
This prevents the circuluar dependency between parser.gen.h and
lexer.gen.h. Newer versions of bison add a prototype for yyparse() to
parser.gen.h that include the as-yet-undeclared yyscan_t type.
IDENT syntax now includes ASCII letters and underscores, so
'.foo_bar' now works. Non-ASCII letters won't work in IDENT
tokens (it's impossible to tell which non-ascii characters are
"letters" without full unicode tables), so '.données' is still
a syntax error (the workaround is '.["données"]', since you can
put anything you like in a string).
