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//------------------------------------------------------------------------------
// <copyright file="StringFunctions.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
// <owner current="true" primary="true">Microsoft</owner>
//------------------------------------------------------------------------------
namespace MS.Internal.Xml.XPath {
using System;
using System.Globalization;
using System.Text;
using System.Xml;
using System.Xml.XPath;
using System.Xml.Xsl;
using System.Collections.Generic;
using System.Diagnostics;
internal sealed class StringFunctions : ValueQuery {
Function.FunctionType funcType;
private IList<Query> argList;
public StringFunctions(Function.FunctionType funcType, IList<Query> argList) {
Debug.Assert(argList != null, "Use 'new Query[]{}' instead.");
this.funcType = funcType;
this.argList = argList;
}
private StringFunctions(StringFunctions other) : base(other) {
this.funcType = other.funcType;
Query[] tmp = new Query[other.argList.Count]; {
for (int i = 0; i < tmp.Length; i ++) {
tmp[i] = Clone(other.argList[i]);
}
}
this.argList = tmp;
}
public override void SetXsltContext(XsltContext context){
for (int i = 0; i < argList.Count; i++) {
argList[i].SetXsltContext(context);
}
}
public override object Evaluate(XPathNodeIterator nodeIterator) {
switch (funcType) {
case Function.FunctionType.FuncString : return toString(nodeIterator);
case Function.FunctionType.FuncConcat : return Concat(nodeIterator);
case Function.FunctionType.FuncStartsWith : return StartsWith(nodeIterator);
case Function.FunctionType.FuncContains : return Contains(nodeIterator);
case Function.FunctionType.FuncSubstringBefore : return SubstringBefore(nodeIterator);
case Function.FunctionType.FuncSubstringAfter : return SubstringAfter(nodeIterator);
case Function.FunctionType.FuncSubstring : return Substring(nodeIterator);
case Function.FunctionType.FuncStringLength : return StringLength(nodeIterator);
case Function.FunctionType.FuncNormalize : return Normalize(nodeIterator);
case Function.FunctionType.FuncTranslate : return Translate(nodeIterator);
}
return string.Empty;
}
internal static string toString(double num) {
return num.ToString("R", NumberFormatInfo.InvariantInfo);
}
internal static string toString(bool b) {
return b ? "true" : "false";
}
private string toString(XPathNodeIterator nodeIterator) {
if (argList.Count > 0) {
object argVal = argList[0].Evaluate(nodeIterator);
switch (GetXPathType(argVal)) {
case XPathResultType.NodeSet:
XPathNavigator value = argList[0].Advance();
return value != null ? value.Value : string.Empty;
case XPathResultType.String:
return (string) argVal;
case XPathResultType.Boolean :
return ((bool) argVal) ? "true" : "false";
case XPathResultType_Navigator:
return ((XPathNavigator)argVal).Value;
default:
Debug.Assert(GetXPathType(argVal) == XPathResultType.Number);
return toString((double)argVal);
}
}
return nodeIterator.Current.Value;
}
public override XPathResultType StaticType { get {
if (funcType == Function.FunctionType.FuncStringLength) {
return XPathResultType.Number;
}
if (
funcType == Function.FunctionType.FuncStartsWith ||
funcType == Function.FunctionType.FuncContains
) {
return XPathResultType.Boolean;
}
return XPathResultType.String;
} }
private string Concat(XPathNodeIterator nodeIterator) {
int count = 0;
StringBuilder s = new StringBuilder();
while (count < argList.Count) {
s.Append(argList[count++].Evaluate(nodeIterator).ToString());
}
return s.ToString();
}
private bool StartsWith(XPathNodeIterator nodeIterator) {
string s1 = argList[0].Evaluate(nodeIterator).ToString();
string s2 = argList[1].Evaluate(nodeIterator).ToString();
return s1.Length >= s2.Length && string.CompareOrdinal(s1, 0, s2, 0, s2.Length) == 0;
}
private static readonly CompareInfo compareInfo = CultureInfo.InvariantCulture.CompareInfo;
private bool Contains(XPathNodeIterator nodeIterator) {
string s1 = argList[0].Evaluate(nodeIterator).ToString();
string s2 = argList[1].Evaluate(nodeIterator).ToString();
return compareInfo.IndexOf(s1, s2, CompareOptions.Ordinal) >= 0;
}
private string SubstringBefore(XPathNodeIterator nodeIterator) {
string s1 = argList[0].Evaluate(nodeIterator).ToString();
string s2 = argList[1].Evaluate(nodeIterator).ToString();
if (s2.Length == 0) { return s2; }
int idx = compareInfo.IndexOf(s1, s2, CompareOptions.Ordinal);
return (idx < 1) ? string.Empty : s1.Substring(0, idx);
}
private string SubstringAfter(XPathNodeIterator nodeIterator) {
string s1 = argList[0].Evaluate(nodeIterator).ToString();
string s2 = argList[1].Evaluate(nodeIterator).ToString();
if (s2.Length == 0) { return s1; }
int idx = compareInfo.IndexOf(s1, s2, CompareOptions.Ordinal);
return (idx < 0) ? string.Empty : s1.Substring(idx + s2.Length);
}
private string Substring(XPathNodeIterator nodeIterator) {
string str1 = argList[0].Evaluate(nodeIterator).ToString();
double num = XmlConvert.XPathRound(XmlConvert.ToXPathDouble(argList[1].Evaluate(nodeIterator))) - 1 ;
if (Double.IsNaN(num) || str1.Length <= num) {
return string.Empty;
}
if (argList.Count == 3) {
double num1 = XmlConvert.XPathRound(XmlConvert.ToXPathDouble(argList[2].Evaluate(nodeIterator)));
if (Double.IsNaN(num1)) {
return string.Empty;
}
if (num < 0 || num1 < 0 ) {
num1 = num + num1 ;
// NOTE: condition is true for NaN
if (!(num1 > 0)) {
return string.Empty;
}
num = 0;
}
double maxlength = str1.Length - num;
if (num1 > maxlength) {
num1 = maxlength;
}
return str1.Substring((int)num ,(int)num1);
}
if (num < 0) {
num = 0;
}
return str1.Substring((int)num);
}
private Double StringLength(XPathNodeIterator nodeIterator) {
if (argList.Count > 0) {
return argList[0].Evaluate(nodeIterator).ToString().Length;
}
return nodeIterator.Current.Value.Length;
}
private string Normalize(XPathNodeIterator nodeIterator) {
string str1;
if (argList.Count > 0) {
str1 = argList[0].Evaluate(nodeIterator).ToString();
} else {
str1 = nodeIterator.Current.Value;
}
str1 = XmlConvert.TrimString(str1);
int count = 0;
StringBuilder str2 = new StringBuilder();
bool FirstSpace = true;
XmlCharType xmlCharType = XmlCharType.Instance;
while (count < str1.Length) {
if (!xmlCharType.IsWhiteSpace(str1[count])) {
FirstSpace = true;
str2.Append(str1[count]);
} else if (FirstSpace) {
FirstSpace = false;
str2.Append(' ');
}
count++;
}
return str2.ToString();
}
private string Translate(XPathNodeIterator nodeIterator) {
string str1 = argList[0].Evaluate(nodeIterator).ToString();
string str2 = argList[1].Evaluate(nodeIterator).ToString();
string str3 = argList[2].Evaluate(nodeIterator).ToString();
int count = 0, index;
StringBuilder str = new StringBuilder();
while (count < str1.Length) {
index = str2.IndexOf(str1[count]);
if (index != -1) {
if (index < str3.Length) {
str.Append(str3[index]);
}
} else {
str.Append(str1[count]);
}
count++;
}
return str.ToString();
}
public override XPathNodeIterator Clone() { return new StringFunctions(this); }
public override void PrintQuery(XmlWriter w) {
w.WriteStartElement(this.GetType().Name);
w.WriteAttributeString("name", funcType.ToString());
foreach(Query arg in this.argList) {
arg.PrintQuery(w);
}
w.WriteEndElement();
}
}
}
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