Examples of org.stringtemplate.v4.AutoIndentWriter

org.stringtemplate.v4.AutoIndentWriter
Essentially a char filter that knows how to auto-indent output by maintaining a stack of indent levels. The indent stack is a stack of strings so we can repeat original indent not just the same number of columns (don't have to worry about tabs vs spaces then). Anchors are char positions (tabs won't work) that indicate where all future wraps should justify to. The wrap position is actually the larger of either the last anchor or the indentation level. This is a filter on a Writer. \n is the proper way to say newline for options and templates. Templates can mix \r\n and \n them but use \n for sure in options like wrap="\n". ST will generate the right thing. Override the default (locale) newline by passing in a string to the constructor.

          new DebugInterpreter(outputFileST.groupThatCreatedThisInstance,
              outputFileST.impl.nativeGroup.errMgr,
              debug);
      InstanceScope scope = new InstanceScope(null, outputFileST);
      StringWriter sw = new StringWriter();
      AutoIndentWriter out = new AutoIndentWriter(sw);
      interp.exec(out, scope);


      for (String e : interp.evals) {
        if (e.contains(pattern)) {
          evals.add(e);

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  public void write(ST code, String fileName) {
    try {
//      long start = System.currentTimeMillis();
      Writer w = tool.getOutputFileWriter(g, fileName);
      STWriter wr = new AutoIndentWriter(w);
      wr.setLineWidth(lineWidth);
      code.write(wr);
      w.close();
//      long stop = System.currentTimeMillis();
    }
    catch (IOException ioe) {

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    ST st = new ST(
      "<values:{v|<if(v)>x<endif>}; separator=\" \">"
    );
    st.add("values", new boolean[] {true, false, true});
    StringWriter sw = new StringWriter();
    st.write(new AutoIndentWriter(sw));
    String result = sw.toString();
    String expecting = "x  x";
    assertEquals(expecting, result);
  }

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    writeFile(dir, "group.stg", groupFile);
    STGroupFile group = new STGroupFile(dir+"/group.stg");


    ST st = group.getInstanceOf("t");
    StringWriter sw = new StringWriter();
    st.write(new AutoIndentWriter(sw));
    String result = sw.toString();
    String expecting = "a,,c,";
    assertEquals(expecting, result);
  }

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    ST st = new ST(
      "<values; separator=\" \">"
    );
    st.add("values", new String[]{"x", "", "y"});
    StringWriter sw = new StringWriter();
    st.write(new AutoIndentWriter(sw));
    String result = sw.toString();
    String expecting = "x  y";
    assertEquals(expecting, result);
  }

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    @Test public void testCharLiterals() throws Exception {
        ST st = new ST(
                "Foo <\\n><\\n><\\t> bar\n"
                );
        StringWriter sw = new StringWriter();
        st.write(new AutoIndentWriter(sw,"\n")); // force \n as newline
        String result = sw.toString();
        String expecting ="Foo \n\n\t bar\n";     // expect \n in output
        assertEquals(expecting, result);


        st = new ST(
                "Foo <\\n><\\t> bar" +newline);
        sw = new StringWriter();
        st.write(new AutoIndentWriter(sw,"\n")); // force \n as newline
        expecting ="Foo \n\t bar\n";     // expect \n in output
        result = sw.toString();
        assertEquals(expecting, result);


        st = new ST(
                "Foo<\\ >bar<\\n>");
        sw = new StringWriter();
        st.write(new AutoIndentWriter(sw,"\n")); // force \n as newline
        result = sw.toString();
        expecting ="Foo bar\n"; // forced \n
        assertEquals(expecting, result);
    }

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        ST st = new ST(
                "Foo <\\\\>"+newline+
                "  \t  bar" +newline
                );
        StringWriter sw = new StringWriter();
        st.write(new AutoIndentWriter(sw,"\n")); // force \n as newline
        String result = sw.toString();
        String expecting ="Foo bar\n";     // expect \n in output
        assertEquals(expecting, result);
    }

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        ST st = new ST(
                "Foo <\\\\>       "+newline+
                "  \t  bar" +newline
                );
        StringWriter sw = new StringWriter();
        st.write(new AutoIndentWriter(sw,"\n")); // force \n as newline
        String result = sw.toString();
        String expecting ="Foo bar\n";
        assertEquals(expecting, result);
    }

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        ST st = new ST(
                "Foo <\\\\>"+newline+
                "bar\n"
                );
        StringWriter sw = new StringWriter();
        st.write(new AutoIndentWriter(sw,"\n")); // force \n as newline
        String result = sw.toString();
        String expecting ="Foo bar\n";
        assertEquals(expecting, result);
    }

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        ST st = new ST(
                "Foo\r\n"+
                "Bar\n"
                );
        StringWriter sw = new StringWriter();
        st.write(new AutoIndentWriter(sw,"\n")); // force \n as newline
        String result = sw.toString();
        String expecting ="Foo\nBar\n";     // expect \n in output
        assertEquals(expecting, result);
    }

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