Nicolas Williams
5bfb9781f7
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
$
37 lines
1.1 KiB
C
37 lines
1.1 KiB
C
#ifndef _JQ_H_
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#define _JQ_H_
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#include <stdio.h>
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#include <jv.h>
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enum {JQ_DEBUG_TRACE = 1};
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typedef struct jq_state jq_state;
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typedef void (*jq_err_cb)(void *, jv);
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jq_state *jq_init(void);
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void jq_set_error_cb(jq_state *, jq_err_cb, void *);
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void jq_get_error_cb(jq_state *, jq_err_cb *, void **);
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void jq_set_nomem_handler(jq_state *, void (*)(void *), void *);
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jv jq_format_error(jv msg);
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void jq_report_error(jq_state *, jv);
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int jq_compile(jq_state *, const char*);
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int jq_compile_args(jq_state *, const char*, jv);
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void jq_dump_disassembly(jq_state *, int);
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void jq_start(jq_state *, jv value, int);
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jv jq_next(jq_state *);
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void jq_teardown(jq_state **);
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typedef jv (*jq_input_cb)(jq_state *, void *);
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void jq_set_input_cb(jq_state *, jq_input_cb, void *);
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void jq_get_input_cb(jq_state *, jq_input_cb *, void **);
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void jq_set_attrs(jq_state *, jv);
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jv jq_get_attrs(jq_state *);
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jv jq_get_jq_origin(jq_state *);
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jv jq_get_prog_origin(jq_state *);
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jv jq_get_lib_dirs(jq_state *);
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void jq_set_attr(jq_state *, jv, jv);
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jv jq_get_attr(jq_state *, jv);
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#endif /* !_JQ_H_ */
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