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package com.metaweb.lessen.tokenizers;
import java.util.LinkedList;
import java.util.List;
import com.metaweb.lessen.tokens.Token;
import com.metaweb.lessen.tokens.Token.Type;
public class IndentingTokenizer implements Tokenizer {
final protected BufferedTokenizer _tokenizer;
final protected String _indent;
final protected List<Token> _tokens = new LinkedList<Token>();
final protected List<String> _indents = new LinkedList<String>();
public IndentingTokenizer(Tokenizer tokenizer) {
this(tokenizer, " ");
}
public IndentingTokenizer(Tokenizer tokenizer, String indent) {
_tokenizer = new BufferedTokenizer(tokenizer);
_indent = indent;
_indents.add("");
getMore();
}
@Override
public Token getToken() {
return _tokens.size() == 0 ? null : _tokens.get(0);
}
@Override
public void next() {
if (_tokens.size() > 0) {
_tokens.remove(0);
}
if (_tokens.size() == 0) {
getMore();
}
}
protected void getMore() {
Token t;
while ((t = _tokenizer.getToken()) != null) {
if (t.type == Type.Comment || t.type == Type.CDataOpen || t.type == Type.CDataClose) {
_tokenizer.next();
_tokens.add(t);
} else if (t.type == Type.Whitespace) {
_tokenizer.next();
Token t2;
while ((t2 = _tokenizer.getToken()) != null && t2.type == Type.Whitespace) {
_tokenizer.next();
}
_tokens.add(new Token(Type.Whitespace, t.start, t.end, "\n"));
} else {
processStatement(0);
break;
}
}
}
protected void processStatement(int level) {
boolean wroteNewLine = false;
Token t;
while ((t = _tokenizer.getToken()) != null) {
if (t.type == Type.Delimiter) {
if (t.text.equals(";")) {
_tokenizer.next();
_tokens.add(t);
processTrailingComments();
break;
} else if (t.text.equals("}")) {
// } belongs to the outer block, don't swallow it
break;
} else if (t.text.equals("{")) {
_tokenizer.next();
_tokens.add(t);
processBlock(level + 1);
t = _tokenizer.getToken();
if (t != null && t.type == Type.Delimiter && t.text.equals("}")) {
_tokenizer.next();
breakLine(t);
indent(t, level);
_tokens.add(t);
}
processTrailingComments();
break;
}
}
_tokenizer.next();
if (!wroteNewLine) {
if (t.type == Type.Whitespace) {
continue;
}
breakLine(t);
indent(t, level);
wroteNewLine = true;
}
if (t.type == Type.Whitespace) {
String text = t.text;
if (text.indexOf('\n') >= 0) {
breakLine(t);
indent(t, level);
} else {
_tokens.add(new Token(Type.Whitespace, t.start, t.start, " "));
}
} else {
_tokens.add(t);
}
}
}
protected void processBlock(int level) {
Token t;
while ((t = _tokenizer.getToken()) != null) {
processStatement(level);
t = _tokenizer.getToken();
if (t != null && t.type == Type.Delimiter && t.text.equals("}")) {
break;
}
}
}
protected void processTrailingComments() {
boolean hasSpace = false;
Token t;
while ((t = _tokenizer.getToken()) != null) {
if (t.type == Type.Whitespace) {
if (t.text.indexOf('\n') >= 0) {
return;
} else {
_tokenizer.next();
hasSpace = true;
}
} else if (t.type == Type.Comment) {
if (hasSpace) {
_tokens.add(new Token(Type.Whitespace, t.start, t.start, " "));
hasSpace = false;
}
_tokenizer.next();
_tokens.add(t);
} else {
break;
}
}
}
protected void breakLine(Token t) {
_tokens.add(new Token(Type.Whitespace, t.start, t.start, "\n"));
}
protected void indent(Token t, int level) {
_tokens.add(new Token(Type.Whitespace, t.start, t.start, makeIndent(level)));
}
protected String makeIndent(int level) {
while (level >= _indents.size()) {
_indents.add(_indents.get(_indents.size() - 1) + _indent);
}
return _indents.get(level);
}
}
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