Quoting fribidi.c: /* There are a few little points in pushing into and poping from the status stack: 1. when the embedding level is not valid (more than FRIBIDI_BIDI_MAX_EXPLICIT_LEVEL=61), you must reject it, and not to push into the stack, but when you see a PDF, you must find the matching code, and if it was pushed in the stack, pop it, it means you must pop if and only if you have pushed the matching code, the over_pushed var counts the number of rejected codes so far. 2. there's a more confusing point too, when the embedding level is exactly FRIBIDI_BIDI_MAX_EXPLICIT_LEVEL-1=60, an LRO or LRE is rejected because the new level would be FRIBIDI_BIDI_MAX_EXPLICIT_LEVEL+1=62, that is invalid; but an RLO or RLE is accepted because the new level is FRIBIDI_BIDI_MAX_EXPLICIT_LEVEL=61, that is valid, so the rejected codes may be not continuous in the logical order, in fact there are at most two continuous intervals of codes, with an RLO or RLE between them. To support this case, the first_interval var counts the number of rejected codes in the first interval, when it is 0, means that there is only one interval. */
--behdad http://behdad.org/
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