Class CssVariableUtil

java.lang.Object

com.itextpdf.styledxmlparser.util.CssVariableUtil

public class CssVariableUtil
extends Object

Utility class for resolving css variables in declarations.

Field Summary

Fields

Modifier and Type	Field	Description
private static final org.slf4j.Logger	LOGGER
private static final int	MAX_CSS_VAR_COUNT	Max count of css var expressions in single declaration.

Constructor Summary

Constructors

Modifier	Constructor	Description
private	CssVariableUtil()

Method Summary

Modifier and Type	Method	Description
static boolean	containsVarExpression(String expression)	Checks for var expression.
private static List<CssDeclaration>	expandShorthand(CssDeclaration declaration)
static boolean	isCssVariable(String property)	Checks property for css variable.
static void	resolveCssVariables(Map<String,String> styles)	Resolve all css variables in style map
private static CssDeclaration	resolveSingleVar(String key, String expression, Map<String,String> styles)	Resolve single css var expression recursively
private static String	resolveVarExpression(String varExpression, Map<String,String> styles)	Resolve css variable expression, if there is a fallback value and primary value is null, default value will be returned.
private static String	resolveVarRecursively(String expression, Map<String,String> styles, int level)	Resolves variables without taking into account default values

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

LOGGER

private static final org.slf4j.Logger LOGGER

MAX_CSS_VAR_COUNT

private static final int MAX_CSS_VAR_COUNT

Max count of css var expressions in single declaration.

See Also:

• Constant Field Values

Constructor Details

CssVariableUtil

private CssVariableUtil()

Method Details

resolveCssVariables

public static void resolveCssVariables(Map<String,String> styles)

Resolve all css variables in style map

Parameters:

styles - css styles map

containsVarExpression

public static boolean containsVarExpression(String expression)

Checks for var expression.

Parameters:

expression - css expression to check

Returns:

true if there is a var expression, false otherwise

isCssVariable

public static boolean isCssVariable(String property)

Checks property for css variable.

Parameters:

property - css property to check

Returns:

true if it is a css variable, false otherwise

expandShorthand

private static List<CssDeclaration> expandShorthand(CssDeclaration declaration)

resolveSingleVar

private static CssDeclaration resolveSingleVar(String key,
 String expression,
 Map<String,String> styles)

Resolve single css var expression recursively

Parameters:

key - css style property

expression - css expression

styles - css styles map

Returns:

resolved var expression if present or null if none found

resolveVarRecursively

private static String resolveVarRecursively(String expression,
 Map<String,String> styles,
 int level)

Resolves variables without taking into account default values

Parameters:

expression - var value

styles - element styles

level - current var expression nesting level

Returns:

resolved var expression

resolveVarExpression

private static String resolveVarExpression(String varExpression,
 Map<String,String> styles)

Resolve css variable expression, if there is a fallback value and primary value is null, default value will be returned.

Parameters:

varExpression - expression as the following: var(.+?(?:,.*?)?)

styles - map of styles containing resolved variables

Returns:

resolved var expression