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package org.zwobble.mammoth.internal.styles.parsing;
import org.zwobble.mammoth.internal.html.HtmlTag;
import org.zwobble.mammoth.internal.styles.HtmlPath;
import org.zwobble.mammoth.internal.styles.HtmlPathElement;
import org.zwobble.mammoth.internal.styles.HtmlPathElements;
import java.util.*;
import static org.zwobble.mammoth.internal.styles.parsing.TokenParser.parseIdentifier;
import static org.zwobble.mammoth.internal.styles.parsing.TokenParser.parseString;
import static org.zwobble.mammoth.internal.util.Maps.lookup;
public class HtmlPathParser {
public static HtmlPath parse(TokenIterator<TokenType> tokens) {
if (tokens.trySkip(TokenType.SYMBOL, "!")) {
return HtmlPath.IGNORE;
} else {
return parseHtmlPathElements(tokens);
}
}
private static class Attribute {
private final String name;
private final String value;
private final boolean append;
private Attribute(String name, String value, boolean append) {
this.name = name;
this.value = value;
this.append = append;
}
}
private static HtmlPath parseHtmlPathElements(TokenIterator<TokenType> tokens) {
List<HtmlPathElement> elements = new ArrayList<>();
if (tokens.peekTokenType() == TokenType.IDENTIFIER) {
HtmlPathElement element = parseElement(tokens);
elements.add(element);
while (tokens.peekTokenType() == TokenType.WHITESPACE && tokens.isNext(1, TokenType.SYMBOL, ">")) {
tokens.skip(TokenType.WHITESPACE);
tokens.skip(TokenType.SYMBOL, ">");
tokens.skip(TokenType.WHITESPACE);
elements.add(parseElement(tokens));
}
}
return new HtmlPathElements(elements);
}
private static HtmlPathElement parseElement(TokenIterator<TokenType> tokens) {
List<String> tagNames = parseTagNames(tokens);
List<Attribute> attributeList = parseAttributeOrClassNames(tokens);
Map<String, String> attributes = new HashMap<>();
for (Attribute attribute : attributeList) {
if (attribute.append && attributes.containsKey(attribute.name)) {
attributes.put(
attribute.name,
lookup(attributes, attribute.name).get() + " " + attribute.value
);
} else {
attributes.put(attribute.name, attribute.value);
}
}
boolean isFresh = parseIsFresh(tokens);
String separator = parseSeparator(tokens);
return new HtmlPathElement(new HtmlTag(tagNames, attributes, !isFresh, separator));
}
private static List<String> parseTagNames(TokenIterator<TokenType> tokens) {
List<String> tagNames = new ArrayList<>();
tagNames.add(parseIdentifier(tokens));
while (tokens.trySkip(TokenType.SYMBOL, "|")) {
tagNames.add(parseIdentifier(tokens));
}
return tagNames;
}
private static List<Attribute> parseAttributeOrClassNames(TokenIterator<TokenType> tokens) {
List<Attribute> attributes = new ArrayList<>();
while (true) {
Optional<Attribute> attribute = parseAttributeOrClassName(tokens);
if (attribute.isPresent()) {
attributes.add(attribute.get());
} else {
return attributes;
}
}
}
private static Optional<Attribute> parseAttributeOrClassName(TokenIterator<TokenType> tokens) {
if (tokens.isNext(TokenType.SYMBOL, "[")) {
return Optional.of(parseAttribute(tokens));
} else if (tokens.isNext(TokenType.SYMBOL, ".")) {
return Optional.of(parseClassName(tokens));
} else {
return Optional.empty();
}
}
private static Attribute parseAttribute(TokenIterator<TokenType> tokens) {
tokens.skip(TokenType.SYMBOL, "[");
String name = parseIdentifier(tokens);
tokens.skip(TokenType.SYMBOL, "=");
String value = parseString(tokens);
tokens.skip(TokenType.SYMBOL, "]");
return new Attribute(name, value, true);
}
private static Attribute parseClassName(TokenIterator<TokenType> tokens) {
tokens.skip(TokenType.SYMBOL, ".");
String className = parseIdentifier(tokens);
return new Attribute("class", className, true);
}
private static boolean parseIsFresh(TokenIterator<TokenType> tokens) {
return tokens.tryParse(() -> {
tokens.skip(TokenType.SYMBOL, ":");
tokens.skip(TokenType.IDENTIFIER, "fresh");
});
}
private static String parseSeparator(TokenIterator<TokenType> tokens) {
boolean isSeparator = tokens.tryParse(() -> {
tokens.skip(TokenType.SYMBOL, ":");
tokens.skip(TokenType.IDENTIFIER, "separator");
});
if (isSeparator) {
tokens.skip(TokenType.SYMBOL, "(");
String value = TokenParser.parseString(tokens);
tokens.skip(TokenType.SYMBOL, ")");
return value;
} else {
return "";
}
}
}
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