示例#1
0
文件: Preds.java 项目: dirkk/basex
 @Override
 public Expr optimize(final QueryContext qc, final VarScope scp) throws QueryException {
   // number of predicates may change in loop
   for (int p = 0; p < preds.length; p++) {
     final Expr pred = preds[p];
     if (pred instanceof CmpG || pred instanceof CmpV) {
       final Cmp cmp = (Cmp) pred;
       if (cmp.exprs[0].isFunction(Function.POSITION)) {
         final Expr e2 = cmp.exprs[1];
         final SeqType st2 = e2.seqType();
         // position() = last() -> last()
         // position() = $n (numeric) -> $n
         if (e2.isFunction(Function.LAST) || st2.one() && st2.type.isNumber()) {
           if (cmp instanceof CmpG && ((CmpG) cmp).op == OpG.EQ
               || cmp instanceof CmpV && ((CmpV) cmp).op == OpV.EQ) {
             qc.compInfo(OPTWRITE, pred);
             preds[p] = e2;
           }
         }
       }
     } else if (pred instanceof And) {
       if (!pred.has(Flag.FCS)) {
         // replace AND expression with predicates (don't swap position tests)
         qc.compInfo(OPTPRED, pred);
         final Expr[] and = ((Arr) pred).exprs;
         final int m = and.length - 1;
         final ExprList el = new ExprList(preds.length + m);
         for (final Expr e : Arrays.asList(preds).subList(0, p)) el.add(e);
         for (final Expr a : and) {
           // wrap test with boolean() if the result is numeric
           el.add(Function.BOOLEAN.get(null, info, a).optimizeEbv(qc, scp));
         }
         for (final Expr e : Arrays.asList(preds).subList(p + 1, preds.length)) el.add(e);
         preds = el.finish();
       }
     } else if (pred instanceof ANum) {
       final ANum it = (ANum) pred;
       final long i = it.itr();
       if (i == it.dbl()) {
         preds[p] = Pos.get(i, info);
       } else {
         qc.compInfo(OPTREMOVE, this, pred);
         return Empty.SEQ;
       }
     } else if (pred.isValue()) {
       if (pred.ebv(qc, info).bool(info)) {
         qc.compInfo(OPTREMOVE, this, pred);
         preds = Array.delete(preds, p--);
       } else {
         // handle statically known predicates
         qc.compInfo(OPTREMOVE, this, pred);
         return Empty.SEQ;
       }
     }
   }
   return this;
 }
示例#2
0
  /**
   * Formats the specified number and returns a string representation.
   *
   * @param item item
   * @param pics pictures
   * @param ii input info
   * @return picture variables
   * @throws QueryException query exception
   */
  private byte[] format(final ANum item, final Picture[] pics, final InputInfo ii)
      throws QueryException {

    // Rule 1: return results for NaN
    final double d = item.dbl(ii);
    if (Double.isNaN(d)) return nan;

    // Rule 2: check if value if negative (smaller than zero or -0)
    final boolean neg = d < 0 || d == 0 && Double.doubleToLongBits(d) == Long.MIN_VALUE;
    final Picture pic = pics[neg && pics.length == 2 ? 1 : 0];
    final IntList res = new IntList(), intgr = new IntList(), fract = new IntList();
    int exp = 0;

    // Rule 3: percent/permille
    ANum num = item;
    if (pic.pc) num = (ANum) Calc.MULT.ev(num, Int.get(100), ii);
    if (pic.pm) num = (ANum) Calc.MULT.ev(num, Int.get(1000), ii);

    if (Double.isInfinite(num.dbl(ii))) {
      // Rule 4: infinity
      intgr.add(new TokenParser(inf).toArray());
    } else {
      // Rule 5: exponent
      if (pic.minExp != 0 && d != 0) {
        BigDecimal dec = num.dec(ii).abs().stripTrailingZeros();
        int scl = 0;
        if (dec.compareTo(BigDecimal.ONE) >= 0) {
          scl = dec.setScale(0, RoundingMode.HALF_DOWN).precision();
        } else {
          while (dec.compareTo(BigDecimal.ONE) < 0) {
            dec = dec.multiply(BigDecimal.TEN);
            scl--;
          }
          scl++;
        }
        exp = scl - pic.min[0];
        if (exp != 0) {
          final BigDecimal n = BigDecimal.TEN.pow(Math.abs(exp));
          num = (ANum) Calc.MULT.ev(num, Dec.get(exp > 0 ? BigDecimal.ONE.divide(n) : n), ii);
        }
      }
      num = num.round(pic.maxFrac, true).abs();

      // convert positive number to string
      final String s =
          (num instanceof Dbl || num instanceof Flt
                  ? Dec.get(BigDecimal.valueOf(num.dbl(ii)))
                  : num)
              .toString();

      // integer/fractional separator
      final int sep = s.indexOf('.');

      // create integer part
      final int sl = s.length();
      final int il = sep == -1 ? sl : sep;
      for (int i = il; i < pic.min[0]; ++i) intgr.add(zero);
      // fractional number: skip leading 0
      if (!s.startsWith("0.") || pic.min[0] > 0) {
        for (int i = 0; i < il; i++) intgr.add(zero + s.charAt(i) - '0');
      }

      // squeeze in grouping separators
      if (pic.group[0].length == 1 && pic.group[0][0] > 0) {
        // regular pattern with repeating separators
        for (int p = intgr.size() - (neg ? 2 : 1); p > 0; --p) {
          if (p % pic.group[0][0] == 0) intgr.insert(intgr.size() - p, grouping);
        }
      } else {
        // irregular pattern, or no separators at all
        final int gl = pic.group[0].length;
        for (int g = 0; g < gl; ++g) {
          final int pos = intgr.size() - pic.group[0][g];
          if (pos > 0) intgr.insert(pos, grouping);
        }
      }

      // create fractional part
      final int fl = sep == -1 ? 0 : sl - il - 1;
      if (fl != 0) for (int i = sep + 1; i < sl; i++) fract.add(zero + s.charAt(i) - '0');
      for (int i = fl; i < pic.min[1]; ++i) fract.add(zero);

      // squeeze in grouping separators in a reverse manner
      final int ul = fract.size();
      for (int p = pic.group[1].length - 1; p >= 0; p--) {
        final int pos = pic.group[1][p];
        if (pos < ul) fract.insert(pos, grouping);
      }
    }

    // add minus sign
    if (neg && pics.length != 2) res.add(minus);
    // add prefix and integer part
    res.add(pic.prefSuf[0].toArray()).add(intgr.finish());
    // add fractional part
    if (!fract.isEmpty()) res.add(decimal).add(fract.finish());
    // add exponent
    if (pic.minExp != 0) {
      res.add(exponent);
      if (exp < 0) res.add(minus);
      final String s = Integer.toString(Math.abs(exp));
      final int sl = s.length();
      for (int i = sl; i < pic.minExp; i++) res.add(zero);
      for (int i = 0; i < sl; i++) res.add(zero + s.charAt(i) - '0');
    }
    // add suffix
    res.add(pic.prefSuf[1].toArray());
    return new TokenBuilder(res.finish()).finish();
  }