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package com.metaweb.lessen.tokenizers;
import java.util.Map;
import com.metaweb.lessen.tokens.StringValueToken;
import com.metaweb.lessen.tokens.Token;
import com.metaweb.lessen.tokens.UriToken;
import com.metaweb.lessen.tokens.Token.Type;
public class VariableResolvingTokenizer implements Tokenizer {
final protected BufferedTokenizer _tokenizer;
final protected Map<String, String> _variables;
final protected boolean _resolveURIs;
protected Token _token;
public VariableResolvingTokenizer(Tokenizer tokenizer, Map<String, String> variables) {
this(tokenizer, variables, true);
}
public VariableResolvingTokenizer(Tokenizer tokenizer, Map<String, String> variables, boolean resolveURIs) {
_tokenizer = new BufferedTokenizer(tokenizer);
_variables = variables;
_resolveURIs = resolveURIs;
_token = _tokenizer.getToken();
resolve();
}
@Override
public Token getToken() {
return _token;
}
@Override
public void next() {
_tokenizer.next();
_token = _tokenizer.getToken();
resolve();
}
protected void resolve() {
if (_token != null) {
Type type = _token.type;
if (type == Type.Uri) {
UriToken uriToken = (UriToken) _token;
if (uriToken.prefix.equals("url")) {
String url = uriToken.unquotedText;
StringBuffer sb = new StringBuffer();
int start = 0;
while (start < url.length()) {
int dollar = url.indexOf('$', start);
if (dollar < 0 || dollar == url.length() - 1) {
break;
}
sb.append(url.substring(start, dollar));
String name;
if (url.charAt(dollar + 1) == '{') {
int n = dollar + 2;
while (n < url.length()) {
if (url.charAt(n) == '}') {
break;
}
n++;
}
name = url.substring(dollar + 2, n);
start = n + 1;
} else {
int n = dollar + 1;
while (n < url.length()) {
char c = url.charAt(n);
if (Character.isLetter(c) || Character.isDigit(c) || c == '_') {
n++;
} else {
break;
}
}
name = url.substring(dollar + 1, n);
start = n;
}
sb.append(resolveVariable(name));
}
if (start < url.length()) {
sb.append(url.substring(start));
}
String url2 = sb.toString();
if (!url2.equals(url)) {
String text = uriToken.prefix + "(\"" + url2 + "\")";
_token = new UriToken(
uriToken.start,
uriToken.end,
text,
uriToken.prefix,
url2
);
}
}
return;
}
StringBuffer sb = new StringBuffer();
if (type == Type.Operator && _token.text.equals("#")) {
Token nextToken = _tokenizer.getToken(1);
if (nextToken == null || nextToken.type != Type.Variable) {
return;
}
sb.append("#");
type = Type.HashName;
} else if (type == Type.Variable) {
sb.append(resolveVariable(_token));
} else if (
type == Type.HashName ||
type == Type.Identifier ||
type == Type.AtIdentifier
) {
sb.append(_token.text);
} else {
return;
}
int tokenEnd = _token.end;
while (true) {
Token nextToken = _tokenizer.getToken(1);
if (nextToken != null) {
if (nextToken.type == Type.Variable) {
sb.append(resolveVariable(nextToken));
tokenEnd = nextToken.end;
_tokenizer.next();
} else if (nextToken.type == Type.Identifier) {
sb.append(nextToken.text);
tokenEnd = nextToken.end;
_tokenizer.next();
} else {
break;
}
} else {
break;
}
}
Token newToken = new Token(
type,
_token.start,
tokenEnd,
sb.toString()
);
_token = newToken;
}
}
protected String resolveVariable(Token t) {
return resolveVariable(((StringValueToken) t).unquotedText);
}
protected String resolveVariable(String name) {
String resolved = _variables.get(name);
if (resolved == null) {
resolved = "UNDEFINED_VARIABLE";
}
return resolved;
}
}
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