1 files changed, 110 insertions, 0 deletions
diff --git a/dom/xslt/xpath/txFunctionCall.cpp b/dom/xslt/xpath/txFunctionCall.cpp
new file mode 100644
index 0000000000..17a325e2ad
--- /dev/null
+++ b/dom/xslt/xpath/txFunctionCall.cpp
@@ -0,0 +1,110 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "txExpr.h"
+#include "nsAtom.h"
+#include "txIXPathContext.h"
+#include "txNodeSet.h"
+
+#ifdef TX_TO_STRING
+#  include "nsReadableUtils.h"
+#endif
+
+/**
+ * This class represents a FunctionCall as defined by the XSL Working Draft
+ **/
+
+//------------------/
+//- Public Methods -/
+//------------------/
+
+/*
+ * Evaluates the given Expression and converts its result to a number.
+ */
+// static
+nsresult FunctionCall::evaluateToNumber(Expr* aExpr, txIEvalContext* aContext,
+                                        double* aResult) {
+  NS_ASSERTION(aExpr, "missing expression");
+  RefPtr<txAExprResult> exprResult;
+  nsresult rv = aExpr->evaluate(aContext, getter_AddRefs(exprResult));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  *aResult = exprResult->numberValue();
+
+  return NS_OK;
+}
+
+/*
+ * Evaluates the given Expression and converts its result to a NodeSet.
+ * If the result is not a NodeSet nullptr is returned.
+ */
+nsresult FunctionCall::evaluateToNodeSet(Expr* aExpr, txIEvalContext* aContext,
+                                         txNodeSet** aResult) {
+  NS_ASSERTION(aExpr, "Missing expression to evaluate");
+  *aResult = nullptr;
+
+  RefPtr<txAExprResult> exprRes;
+  nsresult rv = aExpr->evaluate(aContext, getter_AddRefs(exprRes));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  if (exprRes->getResultType() != txAExprResult::NODESET) {
+    aContext->receiveError(u"NodeSet expected as argument"_ns,
+                           NS_ERROR_XSLT_NODESET_EXPECTED);
+    return NS_ERROR_XSLT_NODESET_EXPECTED;
+  }
+
+  *aResult = static_cast<txNodeSet*>(static_cast<txAExprResult*>(exprRes));
+  NS_ADDREF(*aResult);
+
+  return NS_OK;
+}
+
+bool FunctionCall::requireParams(int32_t aParamCountMin, int32_t aParamCountMax,
+                                 txIEvalContext* aContext) {
+  int32_t argc = mParams.Length();
+  if (argc < aParamCountMin || (aParamCountMax > -1 && argc > aParamCountMax)) {
+    nsAutoString err(u"invalid number of parameters for function"_ns);
+#ifdef TX_TO_STRING
+    err.AppendLiteral(": ");
+    toString(err);
+#endif
+    aContext->receiveError(err, NS_ERROR_XPATH_INVALID_ARG);
+
+    return false;
+  }
+
+  return true;
+}
+
+Expr* FunctionCall::getSubExprAt(uint32_t aPos) {
+  return mParams.SafeElementAt(aPos);
+}
+
+void FunctionCall::setSubExprAt(uint32_t aPos, Expr* aExpr) {
+  NS_ASSERTION(aPos < mParams.Length(), "setting bad subexpression index");
+  mParams[aPos] = aExpr;
+}
+
+bool FunctionCall::argsSensitiveTo(ContextSensitivity aContext) {
+  uint32_t i, len = mParams.Length();
+  for (i = 0; i < len; ++i) {
+    if (mParams[i]->isSensitiveTo(aContext)) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
+#ifdef TX_TO_STRING
+void FunctionCall::toString(nsAString& aDest) {
+  appendName(aDest);
+  aDest.AppendLiteral("(");
+  StringJoinAppend(
+      aDest, u","_ns, mParams,
+      [](nsAString& dest, const auto& param) { param->toString(dest); });
+  aDest.Append(char16_t(')'));
+}
+#endif