Structural replace for log statements

Answered

Permanently deleted user

Created December 21, 2016 05:12

I am using a logging library which supports logging varargs of key value pairs e.g.

log.info("a_string", "another_string", "key1", value1, "key2", value2, "key3", value3);

I am trying to use SSR to convert these log statements to the log statement supported by slf4j. So I want to convert above statement to,

log.info("a_string another_string key1={} key2={} key3={}", value1, value2, value3);

Since my logging library supports passing varargs of key-value pairs, the only way I found was to have multiple SSR templates to support the slf4j migration i.e. one SSR template each supporting 1 key-value pair, 2 key-value pairs, 3 key-value pair and so on. Is there a way to write more generic SSR template to detect and convert variable number of key-value pairs into the format expected by slf4j?

Thanks,

Amol

1 comment

Permanently deleted user

Created December 28, 2016 02:55

I found the solution to this. Its hacky, but works.

Search template-

`log.info($name$, $txt$, $nameorvalue$)`
where name and txt matches exactly once, nameorvalue matches anywhere between 1 to infinity

Replace template-

`log.info($format$, $variables$)`
- Click edit variables
- Select format and click on script text. Paste following code,

StringBuilder sb = new StringBuilder();
sb.append("\"");
if (name instanceof com.intellij.psi.impl.source.tree.java.PsiMethodCallExpressionImpl) {
 sb.append("{}");
} else {
  sb.append(name.getValue());
}
sb.append(" ");
if (txt instanceof com.intellij.psi.PsiLiteralExpression) {
   sb.append(txt.getValue());
} else {
   sb.append("{}");
}
sb.append(" ");
if (nameorvalue instanceof com.intellij.psi.impl.source.tree.java.PsiReferenceExpressionImpl) {
   sb.append("{} ");
} else if (nameorvalue instanceof com.intellij.psi.PsiLiteralExpression) {
  sb.append(nameorvalue.getValue());
} else if (nameorvalue instanceof com.intellij.psi.impl.source.tree.java.PsiMethodCallExpressionImpl) {
  sb.append("{}");
} else {
for (int i = 0; i < nameorvalue.size(); i++) {
   if (i%2 == 1 && nameorvalue.get(i) instanceof com.intellij.psi.PsiLiteralExpression) {
      sb.append(nameorvalue.get(i).getValue());
   } else {
       if (nameorvalue.get(i) instanceof com.intellij.psi.PsiLiteralExpression) {
          sb.append(nameorvalue.get(i).getValue());
       } else {
          sb.append("{}")
       }
   }
   sb.append(" ");
}
}
sb.append("\"");
sb.toString()

- Click on variables and enter following in the script text

StringBuilder sb = new StringBuilder();
if (name instanceof com.intellij.psi.impl.source.tree.java.PsiMethodCallExpressionImpl) {
 sb.append(name.getText());
 sb.append(", ");
}

   if (!(txt instanceof com.intellij.psi.PsiLiteralExpression)) {
       sb.append(txt.getText());
   }

if (nameorvalue instanceof com.intellij.psi.impl.source.tree.java.PsiReferenceExpressionImpl) {
   sb.append(nameorvalue.getCanonicalText());
} else if (nameorvalue instanceof com.intellij.psi.PsiLiteralExpression) {
  
} else if (nameorvalue instanceof com.intellij.psi.impl.source.tree.java.PsiMethodCallExpressionImpl) {
   sb.append(nameorvalue.getText());
} else {
// sb.append(", ");
for (int i = 0; i < nameorvalue.size(); i++) {
   if (!(nameorvalue.get(i) instanceof com.intellij.psi.PsiLiteralExpression)) {
       sb.append(nameorvalue.get(i).getText());
       if (i != nameorvalue.size() - 1) {
          sb.append(", ");
       }
   }
}
}
sb.toString()

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