package com.github.sommeri.less4j.core.compiler.stages;
import java.util.List;
import java.util.Set;
import com.github.sommeri.less4j.core.ast.ASTCssNode;
import com.github.sommeri.less4j.core.ast.ASTCssNodeType;
import com.github.sommeri.less4j.core.ast.Body;
import com.github.sommeri.less4j.core.ast.BodyOwner;
import com.github.sommeri.less4j.core.ast.CssString;
import com.github.sommeri.less4j.core.ast.Expression;
import com.github.sommeri.less4j.core.ast.FunctionExpression;
import com.github.sommeri.less4j.core.ast.ReusableStructure;
import com.github.sommeri.less4j.core.ast.SimpleSelector;
import com.github.sommeri.less4j.core.ast.SelectorCombinator.CombinatorType;
import com.github.sommeri.less4j.core.problems.BugHappened;
import com.github.sommeri.less4j.core.problems.ProblemsHandler;
import com.github.sommeri.less4j.core.validators.SupportedLessBodyMembers;
public class AstLogic {
public static boolean hasOwnScope(ASTCssNode node) {
return isBody(node) || isBodyOwner(node);
}
public static boolean isBodyOwner(ASTCssNode node) {
return node instanceof BodyOwner;
}
protected static boolean isBody(ASTCssNode node) {
return node instanceof Body;
}
public static boolean canHaveArguments(ASTCssNode owner) {
if (owner.getType()!=ASTCssNodeType.REUSABLE_STRUCTURE)
return false;
return ((ReusableStructure)owner).hasParameters();
}
public static void validateLessBodyCompatibility(ASTCssNode reference, List<ASTCssNode> members, ProblemsHandler problemsHandler) {
ASTCssNode parent = reference.getParent();
if (!isBody(parent)) {
throw new BugHappened("Parent is not a body instance. " + parent, parent);
}
SupportedLessBodyMembers allowedBodyMembers = new SupportedLessBodyMembers();
Set<ASTCssNodeType> supportedMembers = allowedBodyMembers.getSupportedMembers((Body) parent);
for (ASTCssNode member : members) {
if (!supportedMembers.contains(member.getType())) {
problemsHandler.wrongMemberBroughtIntoBody(reference, member, parent);
}
}
}
public static boolean hasNonSpaceCombinator(SimpleSelector selector) {
return selector.hasLeadingCombinator() && selector.getLeadingCombinator().getCombinatorType()!=CombinatorType.DESCENDANT;
}
public static boolean isQuotelessUrlFunction(ASTCssNode kid) {
if (kid.getType() != ASTCssNodeType.FUNCTION)
return false;
FunctionExpression function = (FunctionExpression) kid;
String name = function.getName();
if (!"url".equals(name == null ? null : name.toLowerCase()))
return false;
Expression parameter = function.getParameter().splitByComma().get(0);
if (parameter.getType()!=ASTCssNodeType.STRING_EXPRESSION)
return false;
CssString stringParameter = (CssString)parameter;
return "".equals(stringParameter.getQuoteType());
}
public static boolean isExpression(ASTCssNode kid) {
return kid instanceof Expression;
}
public static boolean isDetachedRuleset(Expression value) {
return value!=null && value.getType()==ASTCssNodeType.DETACHED_RULESET;
}
}