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//
// GENERATED FILE
//
use super::*;
use crate::SpiceContext;
use f2rust_std::*;
pub const LBCELL: i32 = -5;
/// Extract the endpoints from a DP window
///
/// Extract the left or right endpoints from a double precision
/// window.
///
/// # Required Reading
///
/// * [WINDOWS](crate::required_reading::windows)
///
/// # Brief I/O
///
/// ```text
/// VARIABLE I/O DESCRIPTION
/// -------- --- --------------------------------------------------
/// SIDE I Extract left ('L') or right ('R') endpoints.
/// WINDOW I-O Window to be extracted.
/// ```
///
/// # Detailed Input
///
/// ```text
/// SIDE indicates whether the left or right endpoints of the
/// intervals in the window are to be extracted.
///
/// 'L', 'l' Left endpoints.
/// 'R', 'r' Right endpoints.
///
/// If SIDE is not recognized, the input window is not
/// changed.
///
/// WINDOW on input, is a window containing zero or more intervals.
/// ```
///
/// # Detailed Output
///
/// ```text
/// WINDOW on output, is the collection of singleton intervals
/// containing either the left or the right endpoints of the
/// intervals in the original window.
/// ```
///
/// # Exceptions
///
/// ```text
/// 1) If the endpoint specification, SIDE, is not recognized, the
/// error SPICE(INVALIDENDPNTSPEC) is signaled.
///
/// 2) The cardinality of the input WINDOW must be even. Left
/// endpoints of stored intervals must be strictly greater than
/// preceding right endpoints. Right endpoints must be greater
/// than or equal to corresponding left endpoints. Invalid window
/// data are not diagnosed by this routine and may lead to
/// unpredictable results.
/// ```
///
/// # Particulars
///
/// ```text
/// This routine replaces every interval in the input window with
/// the singleton interval containing one of the endpoints of the
/// interval.
/// ```
///
/// # Examples
///
/// ```text
/// Let WINDOW contain the intervals
///
/// [ 1, 3 ] [ 7, 11 ] [ 23, 27 ] [ 29, 29 ]
///
/// Then the call
///
/// CALL WNEXTD ( 'L', WINDOW )
///
/// produces the window
///
/// [ 1, 1 ] [ 7, 7 ] [ 23, 23 ] [ 29, 29 ]
///
/// And the call
///
/// CALL WNEXTD ( 'R', WINDOW )
///
/// produces the window
///
/// [ 3, 3 ] [ 11, 11 ] [ 27, 27 ] [ 29, 29 ]
/// ```
///
/// # Author and Institution
///
/// ```text
/// N.J. Bachman (JPL)
/// J. Diaz del Rio (ODC Space)
/// H.A. Neilan (JPL)
/// W.L. Taber (JPL)
/// I.M. Underwood (JPL)
/// ```
///
/// # Version
///
/// ```text
/// - SPICELIB Version 1.1.0, 14-MAR-2021 (JDR) (NJB)
///
/// Added IMPLICIT NONE statement.
///
/// Edited the header to comply with NAIF standard. Added entry #2
/// in $Exceptions section.
///
/// - SPICELIB Version 1.0.1, 10-MAR-1992 (WLT)
///
/// Comment section for permuted index source lines was added
/// following the header.
///
/// - SPICELIB Version 1.0.0, 31-JAN-1990 (WLT) (IMU) (HAN)
/// ```
///
/// # Revisions
///
/// ```text
/// - Beta Version 1.2.0, 24-FEB-1989 (HAN)
///
/// Added calls to CHKIN and CHKOUT. Error handling was added to
/// detect invalid endpoint specification. The previous version
/// did not signal an error if SIDE was not 'R', 'r', 'L', or 'l'.
/// ```
pub fn wnextd(ctx: &mut SpiceContext, side: char, window: &mut [f64]) -> crate::Result<()> {
WNEXTD(&[u8::try_from(side).unwrap()], window, ctx.raw_context())?;
ctx.handle_errors()?;
Ok(())
}
//$Procedure WNEXTD ( Extract the endpoints from a DP window )
pub fn WNEXTD(SIDE: &[u8], WINDOW: &mut [f64], ctx: &mut Context) -> f2rust_std::Result<()> {
let SIDE = &SIDE[..1];
let mut WINDOW = DummyArrayMut::new(WINDOW, LBCELL..);
let mut CARD: i32 = 0;
//
// SPICELIB functions
//
//
// Local variables
//
//
// Standard SPICE error handling.
//
if RETURN(ctx) {
return Ok(());
} else {
CHKIN(b"WNEXTD", ctx)?;
}
//
// Get the cardinality of the window. (The size is not important;
// this routine can't create any new intervals.)
//
CARD = CARDD(WINDOW.as_slice(), ctx)?;
//
// Step through the window, keeping one endpoint from each interval.
// For the sake of efficiency, we have separate loops for the two
// possible values of SIDE.
//
if (fstr::eq(SIDE, b"L") || fstr::eq(SIDE, b"l")) {
for I in intrinsics::range(1, CARD, 2) {
WINDOW[(I + 1)] = WINDOW[I];
}
} else if (fstr::eq(SIDE, b"R") || fstr::eq(SIDE, b"r")) {
for I in intrinsics::range(1, CARD, 2) {
WINDOW[I] = WINDOW[(I + 1)];
}
} else {
SETMSG(b"SIDE was *.", ctx);
ERRCH(b"*", SIDE, ctx);
SIGERR(b"SPICE(INVALIDENDPNTSPEC)", ctx)?;
}
CHKOUT(b"WNEXTD", ctx)?;
Ok(())
}