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// ****************************************************************
// Copyright 2007, Charlie Poole
// This is free software licensed under the NUnit license. You may
// obtain a copy of the license at http://nunit.org/?p=license&r=2.4
// ****************************************************************
using System;
using System.Text.RegularExpressions;
namespace NUnit.Framework.Constraints
{
/// <summary>
/// EmptyStringConstraint tests whether a string is empty.
/// </summary>
public class EmptyStringConstraint : EmptyConstraint
{
/// <summary>
/// Test whether the constraint is satisfied by a given value
/// </summary>
/// <param name="actual">The value to be tested</param>
/// <returns>True for success, false for failure</returns>
public override bool Matches(object actual)
{
this.actual = actual;
if ( !(actual is string) )
return false;
return (string)actual == string.Empty;
}
/// <summary>
/// Write the constraint description to a MessageWriter
/// </summary>
/// <param name="writer">The writer on which the description is displayed</param>
public override void WriteDescriptionTo(MessageWriter writer)
{
writer.Write( "<empty>" );
}
}
/// <summary>
/// SubstringConstraint can test whether a string contains
/// the expected substring.
/// </summary>
public class SubstringConstraint : Constraint
{
string expected;
/// <summary>
/// Initializes a new instance of the <see cref="T:SubstringConstraint"/> class.
/// </summary>
/// <param name="expected">The expected.</param>
public SubstringConstraint(string expected)
{
this.expected = expected;
}
/// <summary>
/// Test whether the constraint is satisfied by a given value
/// </summary>
/// <param name="actual">The value to be tested</param>
/// <returns>True for success, false for failure</returns>
public override bool Matches(object actual)
{
this.actual = actual;
if ( !(actual is string) )
return false;
if (this.caseInsensitive)
return ((string)actual).ToLower().IndexOf(expected.ToLower()) >= 0;
else
return ((string)actual).IndexOf(expected) >= 0;
}
/// <summary>
/// Write the constraint description to a MessageWriter
/// </summary>
/// <param name="writer">The writer on which the description is displayed</param>
public override void WriteDescriptionTo(MessageWriter writer)
{
writer.WritePredicate("String containing");
writer.WriteExpectedValue(expected);
if ( this.caseInsensitive )
writer.WriteModifier( "ignoring case" );
}
}
/// <summary>
/// StartsWithConstraint can test whether a string starts
/// with an expected substring.
/// </summary>
public class StartsWithConstraint : Constraint
{
private string expected;
/// <summary>
/// Initializes a new instance of the <see cref="T:StartsWithConstraint"/> class.
/// </summary>
/// <param name="expected">The expected string</param>
public StartsWithConstraint(string expected)
{
this.expected = expected;
}
/// <summary>
/// Test whether the constraint is matched by the actual value.
/// This is a template method, which calls the IsMatch method
/// of the derived class.
/// </summary>
/// <param name="actual"></param>
/// <returns></returns>
public override bool Matches(object actual)
{
this.actual = actual;
if (!(actual is string))
return false;
if ( this.caseInsensitive )
return ((string)actual).ToLower().StartsWith(expected.ToLower());
else
return ((string)actual).StartsWith(expected);
}
/// <summary>
/// Write the constraint description to a MessageWriter
/// </summary>
/// <param name="writer">The writer on which the description is displayed</param>
public override void WriteDescriptionTo(MessageWriter writer)
{
writer.WritePredicate("String starting with");
writer.WriteExpectedValue( MsgUtils.ClipString(expected, writer.MaxLineLength - 40, 0) );
if ( this.caseInsensitive )
writer.WriteModifier( "ignoring case" );
}
}
/// <summary>
/// EndsWithConstraint can test whether a string ends
/// with an expected substring.
/// </summary>
public class EndsWithConstraint : Constraint
{
private string expected;
/// <summary>
/// Initializes a new instance of the <see cref="T:EndsWithConstraint"/> class.
/// </summary>
/// <param name="expected">The expected string</param>
public EndsWithConstraint(string expected)
{
this.expected = expected;
}
/// <summary>
/// Test whether the constraint is matched by the actual value.
/// This is a template method, which calls the IsMatch method
/// of the derived class.
/// </summary>
/// <param name="actual"></param>
/// <returns></returns>
public override bool Matches(object actual)
{
this.actual = actual;
if (!(actual is string))
return false;
if ( this.caseInsensitive )
return ((string)actual).ToLower().EndsWith(expected.ToLower());
else
return ((string)actual).EndsWith(expected);
}
/// <summary>
/// Write the constraint description to a MessageWriter
/// </summary>
/// <param name="writer">The writer on which the description is displayed</param>
public override void WriteDescriptionTo(MessageWriter writer)
{
writer.WritePredicate("String ending with");
writer.WriteExpectedValue(expected);
if ( this.caseInsensitive )
writer.WriteModifier( "ignoring case" );
}
}
/// <summary>
/// RegexConstraint can test whether a string matches
/// the pattern provided.
/// </summary>
public class RegexConstraint : Constraint
{
string pattern;
/// <summary>
/// Initializes a new instance of the <see cref="T:RegexConstraint"/> class.
/// </summary>
/// <param name="pattern">The pattern.</param>
public RegexConstraint(string pattern)
{
this.pattern = pattern;
}
/// <summary>
/// Test whether the constraint is satisfied by a given value
/// </summary>
/// <param name="actual">The value to be tested</param>
/// <returns>True for success, false for failure</returns>
public override bool Matches(object actual)
{
this.actual = actual;
return actual is string &&
Regex.IsMatch(
(string)actual,
this.pattern,
this.caseInsensitive ? RegexOptions.IgnoreCase : RegexOptions.None );
}
/// <summary>
/// Write the constraint description to a MessageWriter
/// </summary>
/// <param name="writer">The writer on which the description is displayed</param>
public override void WriteDescriptionTo(MessageWriter writer)
{
writer.WritePredicate("String matching");
writer.WriteExpectedValue(this.pattern);
if ( this.caseInsensitive )
writer.WriteModifier( "ignoring case" );
}
}
}
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