TeXUtilities.java :  » Algebra » symja » org » matheclipse » core » eval » Java Open Source

package org.matheclipse.core.eval;

import java.io.Writer;

import org.matheclipse.core.convert.AST2Expr;
import org.matheclipse.core.form.tex.TeXFormFactory;
import org.matheclipse.core.interfaces.IExpr;
import org.matheclipse.parser.client.Parser;
import org.matheclipse.parser.client.ast.ASTNode;

/**
 * Convert an expression into TeX output
 * 
 */
public class TeXUtilities {
  protected EvalEngine fEvalEngine;

//  protected ExprFactory fFactory;

  protected TeXFormFactory fTeXFactory;

  Parser fParser;

  public TeXUtilities(final EvalEngine evalEngine) {
    fEvalEngine = evalEngine;
    // set the thread local instance
    EvalEngine.set(evalEngine);
    fTeXFactory = new TeXFormFactory();
    fParser = new Parser();
  }

  /**
   * Converts the inputExpression string into a TeX expression and writes the
   * result to the given <code>Writer</code>
   * 
   * @param inputExpression
   * @param out
   */
  synchronized public void toTeX(final String inputExpression, final Writer out) {
    IExpr parsedExpression = null;
    ASTNode node;
    if (inputExpression != null) {
      try {
        node = fParser.parse(inputExpression);
        parsedExpression = AST2Expr.CONST.convert(node);
      } catch (final Throwable e) {
        // parsedExpression == null ==> fError occured
      }
    }
    toTeX(parsedExpression, out);
  }

  /**
   * Converts the objectExpression into a MathML expression and writes the
   * result to the given <code>Writer</code>
   * 
   * @param objectExpression
   * @param out
   */
  synchronized public void toTeX(final Object objectExpression, final Writer out) {
    final StringBuffer buf = new StringBuffer();

    if (objectExpression != null) {
      fTeXFactory.convert(buf, objectExpression, 0);
      try {
        out.write(buf.toString());
      } catch (final Throwable e) {
        // parsedExpression == null ==> fError occured
      }
    }
  }

  public void stopRequest() {
    fEvalEngine.stopRequest();
  }
}