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<b>Warning</b>:  session_start(): open(/var/lib/php/sessions/sess_mejsd8nekf8p4ghmq9re117mo4, O_RDWR) failed: No space left on device (28) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
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<b>Warning</b>:  session_start(): Failed to read session data: files (path: /var/lib/php/sessions) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
static CtxExpr ctxParseExpression(S exp) {
  Explain e = explain(exp, ctxParsingRules(), "exp");
  if (e == null) fail("Couldn't parse expression: " + exp);
  ret ctxParseExpression(e);
}

static CtxExpr ctxParseExpression(Explain exp) {
  try {
    if (exp.is("bracket"))
      ret ctxParseExpression(exp.sub(0));
    if (exp.is("and"))
      ret new CtxAnd(ctxParseExpression(exp.sub(0)),
        ctxParseExpression(exp.sub(1)));
    if (exp.is("or"))
      ret new CtxOr(ctxParseExpression(exp.sub(0)),
        ctxParseExpression(exp.sub(1)));
    if (exp.is("neg"))
      ret new CtxNeg(ctxParseExpression(exp.sub(0));
    if (exp.is("quoted"))
      ret new CtxRegexp(unquoteCtx(exp.tok().get(1)));
    if (exp.is("comp"))
      ret new CtxComp(exp.str(0), exp.str(1));
    if (exp.is("match"))
      ret new CtxMatch(exp.str(0), unquoteCtx(exp.str(1)));
    if (exp.singleEqualChild())
      ret ctxParseExpression(exp.sub(0));
  } catch e {
    printExplainTree(exp);
    throw rethrow(e);
  }
  throw todo(exp.className());
}