com.github.sommeri.less4j.utils.debugonly.DebugAndTestPrint Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of less4j Show documentation

Less language is an extension of css and less4j compiles it into regular css. It adds several dynamic features into css: variables, expressions, nested rules. Less4j is a port. The original compiler was written in JavaScript and is called less.js. The less language is mostly defined in less.js documentation/issues and by what less.js actually do. Links to less.js: * home page: http://lesscss.org/ * source code & issues: https://github.com/cloudhead/less.js

There is a newer version: 1.17.2

Show newest version

package com.github.sommeri.less4j.utils.debugonly;

import java.util.List;

import org.antlr.runtime.ANTLRStringStream;
import org.antlr.runtime.Token;

import com.github.sommeri.less4j.core.parser.LessLexer;
import com.github.sommeri.less4j.core.parser.HiddenTokenAwareTree;
import com.github.sommeri.less4j.platform.Constants;
import com.github.sommeri.less4j.utils.PrintUtils;

public class DebugAndTestPrint {

  public static final String FILE_SEPARATOR = "#FILE_SEPARATOR#";
  private static boolean printIndexes = true;
  private static boolean printComments = true;

  public static void printTokenStream(String expression) {
    LessLexer createLexer = createLexer(expression);
    Token token = createLexer.nextToken();
    int count = 0;
    while (token.getType() != LessLexer.EOF) {
      System.out.println(toString(count++, token));
      token = createLexer.nextToken();
    }
  }

  private static LessLexer createLexer(String expression) {
    ANTLRStringStream input = new ANTLRStringStream(expression);
    LessLexer lexer = new LessLexer(input);
    return lexer;
  }

  public static String toString(int count, Token token) {
    return "(" + count + ") " + PrintUtils.toName(token.getType()) + " " + toOneLine(token.getText());
  }

  private static String toOneLine(String text) {
    return text.replace("\r\n", "").replace("\n", "");
  }

  public static void print(HiddenTokenAwareTree ast) {
    print(ast, 0);
  }

  private static void print(HiddenTokenAwareTree tree, int level) {
    indent(level);
    printSingleNode(tree);

    // print all children
    if (tree.getChildren() != null)
      for (Object ie : tree.getChildren()) {
        print((HiddenTokenAwareTree) ie, level + 1);
      }
  }

  public static void indent(int level) {
    for (int i = 0; i < level; i++)
      System.out.print("--");
  }

  public static void printSingleNode(HiddenTokenAwareTree tree) {
    String invalid = "";
    if (tree.getType()==0)
      invalid = " (" + PrintUtils.toName(tree.getType()) + ")";
    
    String base = " " + " " + toOneLine(tree.getText()) + invalid;
    if (printIndexes) {
      String optionalsuffix = " " + tree.getTokenStartIndex() + "-" + tree.getTokenStopIndex() + " " + (tree.getToken() == null ? "" : tree.getToken().getTokenIndex());
      base = base + optionalsuffix;
    }
    if (printComments) {
      String optionalsuffix = " PC:" + printComments(tree.getPreceding()) + " FC:" + printComments(tree.getFollowing());
      base = base + optionalsuffix;
    }
    System.out.println(base);
  }

  public static String printComments(List list) {
    String result = "" + list.size();
    for (Token token : list) {
      if (token.getType()==LessLexer.COMMENT)
        result+=token.getText();
    }
    return result;
  }

  public static String slashToplatformFileSeparator(String path) {
    if (path==null)
      return path;
    
    return platformFileSeparator(path.replace("/", FILE_SEPARATOR));
  }

  public static String platformFileSeparator(String path) {
    if (path==null)
      return path;
    
    return path.replace(FILE_SEPARATOR, Constants.FILE_SEPARATOR);
  }

  
}