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phloc CSS parser an other components
/**
* Copyright (C) 2006-2014 phloc systems
* http://www.phloc.com
* office[at]phloc[dot]com
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.phloc.css.decl;
import java.util.ArrayList;
import java.util.List;
import javax.annotation.Nonnegative;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import javax.annotation.concurrent.NotThreadSafe;
import com.phloc.commons.annotations.Nonempty;
import com.phloc.commons.annotations.ReturnsMutableCopy;
import com.phloc.commons.collections.ContainerHelper;
import com.phloc.commons.hash.HashCodeGenerator;
import com.phloc.commons.state.EChange;
import com.phloc.commons.string.StringHelper;
import com.phloc.commons.string.ToStringGenerator;
import com.phloc.css.CSSSourceLocation;
import com.phloc.css.ECSSSpecification;
import com.phloc.css.ECSSVersion;
import com.phloc.css.ICSSSourceLocationAware;
import com.phloc.css.ICSSVersionAware;
import com.phloc.css.ICSSWriterSettings;
/**
* Represents a single @supports/code> rule: a list of style rules only
* valid when a certain declaration is available. See {@link ECSSSpecification#CSS3_CONDITIONAL}
* Example:
* @supports (transition-property: color) {
div { color:red; }
}
*
* @author Philip Helger
*/
@NotThreadSafe
public class CSSSupportsRule implements ICSSTopLevelRule, ICSSSourceLocationAware, ICSSVersionAware
{
private final List m_aConditionMembers = new ArrayList ();
private final List m_aRules = new ArrayList ();
private CSSSourceLocation m_aSourceLocation;
public CSSSupportsRule ()
{}
public boolean hasSupportConditionMembers ()
{
return !m_aConditionMembers.isEmpty ();
}
@Nonnegative
public int getSupportsConditionMemberCount ()
{
return m_aConditionMembers.size ();
}
@Nonnull
public CSSSupportsRule addSupportConditionMember (@Nonnull final ICSSSupportsConditionMember aMember)
{
if (aMember == null)
throw new NullPointerException ("member");
m_aConditionMembers.add (aMember);
return this;
}
@Nonnull
public CSSSupportsRule addSupportConditionMember (@Nonnegative final int nIndex,
@Nonnull final ICSSSupportsConditionMember aMember)
{
if (nIndex < 0)
throw new IllegalArgumentException ("Index too small: " + nIndex);
if (aMember == null)
throw new NullPointerException ("member");
if (nIndex >= getSupportsConditionMemberCount ())
m_aConditionMembers.add (aMember);
else
m_aConditionMembers.add (nIndex, aMember);
return this;
}
@Nonnull
public EChange removeSupportsConditionMember (@Nonnull final ICSSSupportsConditionMember aMember)
{
return EChange.valueOf (m_aConditionMembers.remove (aMember));
}
@Nonnull
public EChange removeSupportsConditionMember (@Nonnegative final int nIndex)
{
if (nIndex < 0 || nIndex >= m_aConditionMembers.size ())
return EChange.UNCHANGED;
m_aConditionMembers.remove (nIndex);
return EChange.CHANGED;
}
/**
* Remove all supports condition members.
*
* @return {@link EChange#CHANGED} if any supports condition was removed,
* {@link EChange#UNCHANGED} otherwise. Never null.
* @since 3.7.3
*/
@Nonnull
public EChange removeAllSupportsConditionMembers ()
{
if (m_aConditionMembers.isEmpty ())
return EChange.UNCHANGED;
m_aConditionMembers.clear ();
return EChange.CHANGED;
}
@Nullable
public ICSSSupportsConditionMember getSupportsConditionMemberAtIndex (@Nonnegative final int nIndex)
{
if (nIndex < 0 || nIndex >= m_aConditionMembers.size ())
return null;
return m_aConditionMembers.get (nIndex);
}
@Nonnull
@ReturnsMutableCopy
public List getAllSupportConditionMembers ()
{
return ContainerHelper.newList (m_aConditionMembers);
}
public boolean hasRules ()
{
return !m_aRules.isEmpty ();
}
@Nonnegative
public int getRuleCount ()
{
return m_aRules.size ();
}
@Nonnull
public CSSSupportsRule addRule (@Nonnull final ICSSTopLevelRule aRule)
{
if (aRule == null)
throw new NullPointerException ("rule");
m_aRules.add (aRule);
return this;
}
@Nonnull
public CSSSupportsRule addRule (@Nonnegative final int nIndex, @Nonnull final ICSSTopLevelRule aRule)
{
if (nIndex < 0)
throw new IllegalArgumentException ("Index too small: " + nIndex);
if (aRule == null)
throw new NullPointerException ("rule");
if (nIndex >= getRuleCount ())
m_aRules.add (aRule);
else
m_aRules.add (nIndex, aRule);
return this;
}
@Nonnull
public EChange removeRule (@Nonnull final ICSSTopLevelRule aRule)
{
return EChange.valueOf (m_aRules.remove (aRule));
}
@Nonnull
public EChange removeRule (@Nonnegative final int nRuleIndex)
{
if (nRuleIndex < 0 || nRuleIndex >= m_aRules.size ())
return EChange.UNCHANGED;
m_aRules.remove (nRuleIndex);
return EChange.CHANGED;
}
@Nullable
public ICSSTopLevelRule getRule (@Nonnegative final int nRuleIndex)
{
if (nRuleIndex < 0 || nRuleIndex >= m_aRules.size ())
return null;
return m_aRules.get (nRuleIndex);
}
/**
* Remove all rules.
*
* @return {@link EChange#CHANGED} if any rule was removed,
* {@link EChange#UNCHANGED} otherwise. Never null.
* @since 3.7.3
*/
@Nonnull
public EChange removeAllDeclarations ()
{
if (m_aRules.isEmpty ())
return EChange.UNCHANGED;
m_aRules.clear ();
return EChange.CHANGED;
}
@Nonnull
@ReturnsMutableCopy
public List getAllRules ()
{
return ContainerHelper.newList (m_aRules);
}
@Nonnull
@Nonempty
public String getAsCSSString (@Nonnull final ICSSWriterSettings aSettings, @Nonnegative final int nIndentLevel)
{
aSettings.checkVersionRequirements (this);
// Always ignore SupportsCondition rules?
if (!aSettings.isWriteSupportsRules ())
return "";
final boolean bOptimizedOutput = aSettings.isOptimizedOutput ();
final int nRuleCount = m_aRules.size ();
if (aSettings.isRemoveUnnecessaryCode () && nRuleCount == 0)
return "";
final StringBuilder aSB = new StringBuilder ("@supports ");
boolean bFirst = true;
for (final ICSSSupportsConditionMember aCondition : m_aConditionMembers)
{
if (bFirst)
bFirst = false;
else
aSB.append (' ');
aSB.append (aCondition.getAsCSSString (aSettings, nIndentLevel));
}
if (nRuleCount == 0)
{
aSB.append (bOptimizedOutput ? "{}" : " {}\n");
}
else
{
// At least one rule present
aSB.append (bOptimizedOutput ? "{" : " {\n");
bFirst = true;
for (final ICSSTopLevelRule aRule : m_aRules)
{
final String sRuleCSS = aRule.getAsCSSString (aSettings, nIndentLevel + 1);
if (StringHelper.hasText (sRuleCSS))
{
if (bFirst)
bFirst = false;
else
if (!bOptimizedOutput)
aSB.append ('\n');
if (!bOptimizedOutput)
aSB.append (aSettings.getIndent (nIndentLevel + 1));
aSB.append (sRuleCSS);
}
}
if (!bOptimizedOutput)
aSB.append (aSettings.getIndent (nIndentLevel));
aSB.append ('}');
if (!bOptimizedOutput)
aSB.append ('\n');
}
return aSB.toString ();
}
@Nonnull
public ECSSVersion getMinimumCSSVersion ()
{
return ECSSVersion.CSS30;
}
/**
* Set the source location of the object, determined while parsing.
*
* @param aSourceLocation
* The source location to use. May be null.
*/
public void setSourceLocation (@Nullable final CSSSourceLocation aSourceLocation)
{
m_aSourceLocation = aSourceLocation;
}
@Nullable
public CSSSourceLocation getSourceLocation ()
{
return m_aSourceLocation;
}
@Override
public boolean equals (final Object o)
{
if (o == this)
return true;
if (o == null || !getClass ().equals (o.getClass ()))
return false;
final CSSSupportsRule rhs = (CSSSupportsRule) o;
return m_aConditionMembers.equals (rhs.m_aConditionMembers) && m_aRules.equals (rhs.m_aRules);
}
@Override
public int hashCode ()
{
return new HashCodeGenerator (this).append (m_aConditionMembers).append (m_aRules).getHashCode ();
}
@Override
public String toString ()
{
return new ToStringGenerator (this).append ("conditionMembers", m_aConditionMembers)
.append ("rules", m_aRules)
.appendIfNotNull ("sourceLocation", m_aSourceLocation)
.toString ();
}
}