我正在使用RSyntaxTextArea，我找到了语法高亮here的指南。但是，我有一个简单的要求，我只需要从现有的语言语法高亮样式（例如SYNTAX_STYLE_CPLUSPLUS）修改突出显示的关键字（和/或函数）列表。
@Override
public TokenMap getWordsToHighlight() {
TokenMap tokenMap = new TokenMap();
tokenMap.put("case", Token.RESERVED_WORD);
tokenMap.put("for", Token.RESERVED_WORD);
tokenMap.put("if", Token.RESERVED_WORD);
tokenMap.put("foo", Token.RESERVED_WORD); // Added
tokenMap.put("while", Token.RESERVED_WORD);
tokenMap.put("printf", Token.FUNCTION);
tokenMap.put("scanf", Token.FUNCTION);
tokenMap.put("fopen", Token.FUNCTION);
return tokenMap;
}
我不希望通过getTokenList()实现新的语言解析（如指南中所述），只是为了做到这一点。 getWordsToHighlight()的实施也会迫使您实施getTokenList()。有没有更简单的方法？最好不要像反射这样的hacky解决方案。
答案 0 :(得分：0)
没关系，不妨只使用给定的实现并通过预先添加相应的数据类型来修复未定义的变量：
import org.fife.ui.rsyntaxtextarea.AbstractTokenMaker;
import org.fife.ui.rsyntaxtextarea.RSyntaxUtilities;
import org.fife.ui.rsyntaxtextarea.Token;
import org.fife.ui.rsyntaxtextarea.TokenMap;
import javax.swing.text.Segment;
import static org.fife.ui.rsyntaxtextarea.Token.*;
import static org.fife.ui.rsyntaxtextarea.TokenTypes.FUNCTION;
import static org.fife.ui.rsyntaxtextarea.TokenTypes.RESERVED_WORD;
public class KeywordsHighlighting extends AbstractTokenMaker
{
@Override
public TokenMap getWordsToHighlight()
{
TokenMap tokenMap = new TokenMap();
tokenMap.put("case", RESERVED_WORD);
tokenMap.put("for", RESERVED_WORD);
tokenMap.put("if", RESERVED_WORD);
tokenMap.put("foo", RESERVED_WORD); // Added
tokenMap.put("while", RESERVED_WORD);
tokenMap.put("printf", FUNCTION);
tokenMap.put("scanf", FUNCTION);
tokenMap.put("fopen", FUNCTION);
return tokenMap;
}
@Override
public void addToken(Segment segment, int start, int end, int tokenType, int startOffset)
{
if (tokenType == IDENTIFIER)
{
int value = wordsToHighlight.get(segment, start, end);
if (value != -1)
{
tokenType = value;
}
}
super.addToken(segment, start, end, tokenType, startOffset);
}
/**
* Returns a list of tokens representing the given text.
*
* @param text The text to break into tokens.
* @param startTokenType The token with which to start tokenizing.
* @param startOffset The offset at which the line of tokens begins.
* @return A linked list of tokens representing <code>text</code>.
*/
public Token getTokenList(Segment text, int startTokenType, int startOffset)
{
resetTokenList();
char[] array = text.array;
int offset = text.offset;
int count = text.count;
int end = offset + count;
// Token starting offsets are always of the form:
// 'startOffset + (currentTokenStart-offset)', but since startOffset and
// offset are constant, tokens' starting positions become:
// 'newStartOffset+currentTokenStart'.
int newStartOffset = startOffset - offset;
int currentTokenStart = offset;
int currentTokenType = startTokenType;
for (int i = offset; i < end; i++)
{
char c = array[i];
switch (currentTokenType)
{
case Token.NULL:
currentTokenStart = i; // Starting a new token here.
switch (c)
{
case ' ':
case '\t':
currentTokenType = Token.WHITESPACE;
break;
case '"':
currentTokenType = Token.LITERAL_STRING_DOUBLE_QUOTE;
break;
case '#':
currentTokenType = Token.COMMENT_EOL;
break;
default:
if (RSyntaxUtilities.isDigit(c))
{
currentTokenType = Token.LITERAL_NUMBER_DECIMAL_INT;
break;
} else if (RSyntaxUtilities.isLetter(c) || c == '/' || c == '_')
{
currentTokenType = Token.IDENTIFIER;
break;
}
// Anything not currently handled - mark as an identifier
currentTokenType = Token.IDENTIFIER;
break;
} // End of switch (c).
break;
case Token.WHITESPACE:
switch (c)
{
case ' ':
case '\t':
break; // Still whitespace.
case '"':
addToken(text, currentTokenStart, i - 1, Token.WHITESPACE, newStartOffset + currentTokenStart);
currentTokenStart = i;
currentTokenType = Token.LITERAL_STRING_DOUBLE_QUOTE;
break;
case '#':
addToken(text, currentTokenStart, i - 1, Token.WHITESPACE, newStartOffset + currentTokenStart);
currentTokenStart = i;
currentTokenType = Token.COMMENT_EOL;
break;
default: // Add the whitespace token and start anew.
addToken(text, currentTokenStart, i - 1, Token.WHITESPACE, newStartOffset + currentTokenStart);
currentTokenStart = i;
if (RSyntaxUtilities.isDigit(c))
{
currentTokenType = Token.LITERAL_NUMBER_DECIMAL_INT;
break;
} else if (RSyntaxUtilities.isLetter(c) || c == '/' || c == '_')
{
currentTokenType = Token.IDENTIFIER;
break;
}
// Anything not currently handled - mark as identifier
currentTokenType = Token.IDENTIFIER;
} // End of switch (c).
break;
default: // Should never happen
case Token.IDENTIFIER:
switch (c)
{
case ' ':
case '\t':
addToken(text, currentTokenStart, i - 1, Token.IDENTIFIER, newStartOffset + currentTokenStart);
currentTokenStart = i;
currentTokenType = Token.WHITESPACE;
break;
case '"':
addToken(text, currentTokenStart, i - 1, Token.IDENTIFIER, newStartOffset + currentTokenStart);
currentTokenStart = i;
currentTokenType = Token.LITERAL_STRING_DOUBLE_QUOTE;
break;
default:
if (RSyntaxUtilities.isLetterOrDigit(c) || c == '/' || c == '_')
{
break; // Still an identifier of some type.
}
// Otherwise, we're still an identifier (?).
} // End of switch (c).
break;
case Token.LITERAL_NUMBER_DECIMAL_INT:
switch (c)
{
case ' ':
case '\t':
addToken(text, currentTokenStart, i - 1, Token.LITERAL_NUMBER_DECIMAL_INT, newStartOffset + currentTokenStart);
currentTokenStart = i;
currentTokenType = Token.WHITESPACE;
break;
case '"':
addToken(text, currentTokenStart, i - 1, Token.LITERAL_NUMBER_DECIMAL_INT, newStartOffset + currentTokenStart);
currentTokenStart = i;
currentTokenType = Token.LITERAL_STRING_DOUBLE_QUOTE;
break;
default:
if (RSyntaxUtilities.isDigit(c))
{
break; // Still a literal number.
}
// Otherwise, remember this was a number and start over.
addToken(text, currentTokenStart, i - 1, Token.LITERAL_NUMBER_DECIMAL_INT, newStartOffset + currentTokenStart);
i--;
currentTokenType = Token.NULL;
} // End of switch (c).
break;
case Token.COMMENT_EOL:
i = end - 1;
addToken(text, currentTokenStart, i, currentTokenType, newStartOffset + currentTokenStart);
// We need to set token type to null so at the bottom we don't add one more token.
currentTokenType = Token.NULL;
break;
case Token.LITERAL_STRING_DOUBLE_QUOTE:
if (c == '"')
{
addToken(text, currentTokenStart, i, Token.LITERAL_STRING_DOUBLE_QUOTE, newStartOffset + currentTokenStart);
currentTokenType = Token.NULL;
}
break;
} // End of switch (currentTokenType).
} // End of for (int i=offset; i<end; i++).
switch (currentTokenType)
{
// Remember what token type to begin the next line with.
case Token.LITERAL_STRING_DOUBLE_QUOTE:
addToken(text, currentTokenStart, end - 1, currentTokenType, newStartOffset + currentTokenStart);
break;
// Do nothing if everything was okay.
case Token.NULL:
addNullToken();
break;
// All other token types don't continue to the next line...
default:
addToken(text, currentTokenStart, end - 1, currentTokenType, newStartOffset + currentTokenStart);
addNullToken();
}
// Return the first token in our linked list.
return firstToken;
}
}
唯一的问题是现有的语法高亮（如块注释）会丢失。