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This should print out (once) some instructions to interpret the logging traces. (#1637) 

* This should print out (once) some instructions to interpret the logging traces.

* More details.
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Daniel Lemire 2021-06-26 11:38:38 -04:00 committed by GitHub
parent eb849662c0
commit 7e646efd0f
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1 changed files with 28 additions and 0 deletions
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28
include/simdjson/generic/ondemand/logger-inl.h
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@ -72,8 +72,36 @@ inline void log_error(const value_iterator &iter, const char *error, const char
inline void log_headers() noexcept {
if (LOG_ENABLED) {
// Technically a static variable is not thread-safe, but if you are using threads
// and logging... well...
static bool displayed_hint{false};
log_depth = 0;
printf("\n");
if(!displayed_hint) {
// We only print this helpful header once.
printf("# Logging provides the depth and position of the iterator user-visible steps:\n");
printf("# +array says 'this is where we were when we discovered the start array'\n");
printf("# -array says 'this is where we were when we ended the array'\n");
printf("# skip says 'this is a structural or value I am skipping'\n");
printf("# +/-skip says 'this is a start/end array or object I am skipping'\n");
printf("#\n");
printf("# The identation of the terms (array, string,...) indicates the depth,\n");
printf("# in addition to the depth being displayed.\n");
printf("#\n");
printf("# Every token in the document has a single depth determined by the tokens before it,\n");
printf("# and is not affected by what the token actually is.\n");
printf("#\n");
printf("# Not all structural elements are presented as tokens in the logs.\n");
printf("#\n");
printf("# We never give control to the user within an empty array or an empty object.\n");
printf("#\n");
printf("# Inside an array, having a depth greater than the array's depth means that\n");
printf("# we are pointing inside a value.\n");
printf("# Having a depth equal to the array means that we are pointing right before a value.\n");
printf("# Having a depth smaller than the array means that we have moved beyond the array.\n");
displayed_hint = true;
}
printf("\n");
printf("| %-*s ", LOG_EVENT_LEN, "Event");
printf("| %-*s ", LOG_BUFFER_LEN, "Buffer");
printf("| %-*s ", LOG_SMALL_BUFFER_LEN, "Next");