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| package org.qedeq.kernel.latex; |
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| import org.qedeq.kernel.parser.MementoTextInput; |
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| import org.qedeq.kernel.trace.Trace; |
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| import org.qedeq.kernel.utility.TextInput; |
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| public final class LatexTextParser { |
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| private static final String SPECIALCHARACTERS = "(),{}\\~%$&"; |
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| private MementoTextInput input; |
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| private StringBuffer output; |
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| public static final String transform(final String input) {
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| final LatexTextParser parser = new LatexTextParser(input);
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| return parser.parse();
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| } |
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| private LatexTextParser(final String input) {
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| this.input = new MementoTextInput(new TextInput(input));
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| this.output = new StringBuffer();
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| } |
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| private String parse() {
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| while (!eof()) {
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| final String token = readToken();
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| if ("\\begin".equals(token)) {
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| final String curly = readCurlyBraceContents();
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| if ("eqnarray".equals(curly)) {
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| printMathTillEnd(curly);
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| } else if ("eqnarray*".equals(curly)) {
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| printMathTillEnd(curly);
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| } else if ("equation".equals(curly)) {
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| printMathTillEnd(curly);
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| } else if ("equation*".equals(curly)) {
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| printMathTillEnd(curly);
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| } else { |
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| print(token + "{" + curly + "}");
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| } |
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| } else if ("$$".equals(token)) {
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| println();
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| println("<MATH>");
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| printMathTillToken(token);
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| println("\\,</MATH>");
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| println();
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| } else if ("$".equals(token)) {
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| print("<MATH>");
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| printMathTillToken(token);
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| print("\\,</MATH>");
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| } else { |
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| print(token);
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| } |
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| } |
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| return output.toString();
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| } |
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| private void printMathTillEnd(final String curly) {
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| final StringBuffer buffer = new StringBuffer();
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| do {
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| final String item = readToken();
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| if ("\\end".equals(item)) {
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| final String curly2 = readCurlyBraceContents();
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| if (curly.equals(curly2)) {
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| break;
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| } |
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| buffer.append(item + "{" + curly2 + "}");
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| } else { |
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| buffer.append(item);
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| } |
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| } while (true); |
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| printMath(buffer);
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| } |
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| private void printMathTillToken(final String token) {
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| final StringBuffer buffer = new StringBuffer();
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| do {
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| final String item = readToken();
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| if (token.equals(item)) {
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| break;
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| } else { |
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| buffer.append(item);
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| } |
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| } while (true); |
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| printMath(buffer);
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| } |
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| private void printMath(final StringBuffer buffer) {
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| print(buffer.toString());
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| } |
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| protected final String readToken() {
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| final String method = "readToken()";
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| Trace.begin(this, method);
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| StringBuffer token = new StringBuffer();
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| try {
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| do {
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| if (eof()) {
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| if (token.length() <= 0) {
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| token = null;
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| } |
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| break;
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| } |
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| final int c = getChar();
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| if (Character.isDigit((char) c)) {
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| token.append((char) readChar());
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| if (Character.isDigit((char) getChar())) {
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| continue;
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| } |
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| break;
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| } |
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| if (Character.isLetter((char) c)) {
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| token.append((char) readChar());
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| if (Character.isLetter((char) getChar())) {
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| continue;
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| } |
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| break;
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| } |
183 |
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| if (SPECIALCHARACTERS.indexOf(c) >= 0) {
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| switch (c) {
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| case '&':
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| case '%':
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| case '{':
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| case '}':
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| case '~':
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| token.append((char) readChar());
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| break;
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192 |
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| case '$':
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| token.append((char) readChar());
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| if ('$' == getChar()) {
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| continue;
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| } |
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| break;
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198 |
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| case '\\':
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| final String t = readBackslashToken();
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| token.append(t);
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201 |
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| if ('_' == getChar() || '^' == getChar()) {
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| token.append((char) readChar());
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| continue;
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| } |
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| break;
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| default:
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| readChar();
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| token.append((char) c);
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| } |
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| break;
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| } |
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| token.append((char) readChar());
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| if ('_' == getChar() || '^' == getChar()) {
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| token.append((char) readChar());
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| continue;
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| } |
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| break;
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| } while (!eof());
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| Trace.param(this, method, "Read token", token);
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| return (token != null ? token.toString() : null);
|
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| } finally { |
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| Trace.end(this, method);
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| } |
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| } |
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| private String readBackslashToken() {
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| final String method = "readBackslashToken()";
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| Trace.begin(this, method);
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| if (getChar() != '\\') {
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| throw new IllegalArgumentException("\\ expected");
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| } |
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| readChar();
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238 |
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| if (eof()) {
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| Trace.param(this, method, "return", null);
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240 |
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| Trace.end(this, method);
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241 |
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| return null;
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| } |
243 |
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| if (!Character.isLetter((char) getChar())) {
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244 |
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| Trace.param(this, method, "return", (char) getChar());
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245 |
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| Trace.end(this, method);
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246 |
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| return "\\" + ((char) readChar());
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| } |
248 |
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| final StringBuffer buffer = new StringBuffer("\\");
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249 |
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| do {
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250 |
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| buffer.append((char) readChar());
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251 |
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| } while (!eof() && Character.isLetter((char) getChar()));
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| Trace.param(this, method, "return", buffer.toString());
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253 |
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| Trace.end(this, method);
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254 |
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| return buffer.toString();
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| } |
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| private String readCurlyBraceContents() {
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| final String first = readToken();
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264 |
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| if (!"{".equals(first)) {
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| throw new IllegalArgumentException("\"{\" expected, but was: \"" + first + "\"");
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| } |
267 |
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| final StringBuffer buffer = new StringBuffer();
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268 |
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| String next;
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269 |
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| int level = 1;
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270 |
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| while (level > 0) {
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| next = readToken();
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| if ("{".equals(next)) {
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| level++;
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274 |
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| } else if ("}".equals(next)) {
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| level--;
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| } |
277 |
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| if (level <= 0) {
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| break;
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| } |
280 |
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| buffer.append(next);
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| } |
282 |
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| return buffer.toString();
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| } |
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| private final void print(final String line) {
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| output.append(line);
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| } |
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297 |
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| private final void println() {
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| println("");
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| } |
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| private final void println(final String line) {
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| print(line);
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| print("\n");
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| } |
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0
| public final String getToken() {
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| markPosition();
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318 |
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| final String result = readToken();
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| rewindPosition();
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| return result;
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| } |
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0
| protected final void markPosition() {
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| input.markPosition();
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| } |
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| protected final long rewindPosition() {
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| return input.rewindPosition();
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| } |
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| protected final void clearMark() {
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| input.clearMark();
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| } |
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351 |
0
| protected long getPosition() {
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352 |
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| return input.getPosition();
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| } |
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0
| protected final int getChar() {
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363 |
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| return input.getChar();
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| } |
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| protected final int readChar() {
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| return input.readChar();
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| } |
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0
| public final boolean eof() {
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| return input.eof();
|
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| } |
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0
| public final int getRewindStackSize() {
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392 |
0
| return input.getRewindStackSize();
|
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| } |
394 |
| |
395 |
| } |