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proleap-cobol-parser

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ProLeap ANTLR4-based parser for COBOL

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ProLeap ANTLR4-based parser for COBOL
=====================================

This is a **COBOL parser** based on an [ANTLR4 grammar](src/main/antlr4/io/proleap/cobol/Cobol.g4), 
which generates an **Abstract Syntax Tree** (AST) and **Abstract Semantic Graph** (ASG) for COBOL code.
The AST represents plain COBOL source code in a syntax tree structure.
The ASG is generated from the AST by **semantic analysis** and provides data and control
flow information (e. g. variable access). EXEC SQL, EXEC SQLIMS and EXEC CICS
statements are extracted as texts.

The parser is developed test-driven, passes the **NIST test suite** and has successfully been **applied to numerous COBOL files** from banking and insurance. It is used by the [ProLeap analyzer, interpreter & transformer for COBOL](https://github.com/proleap/proleap-cobol).

💫 **Star** if you like our work.

[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
[![ProLeap on Twitter](https://img.shields.io/twitter/follow/proleap_io.svg?style=social&label=Follow)](https://twitter.com/proleap_io)

Example
-------

### Input: COBOL code

```
 Identification Division.
 Program-ID.
  HELLOWORLD.
 Procedure Division.
  Display "Hello world".
  STOP RUN.
```

### Output: Abstract Syntax Tree (AST)

```
(startRule
  (compilationUnit
    (programUnit
      (identificationDivision Identification Division .
        (programIdParagraph Program-ID .
          (programName
            (cobolWord HELLOWORLD)) .))
      (procedureDivision Procedure Division .
        (procedureDivisionBody
          (paragraphs
            (sentence
              (statement
                (displayStatement Display
                  (displayOperand
                    (literal "Hello world")))) .)
            (sentence
              (statement
                (stopStatement STOP RUN))) .)))))) <EOF>)
```

Getting started
---------------

To include the parser in your Maven project build it and add the dependency:

```
<dependency>
  <groupId>io.github.uwol</groupId>
  <artifactId>proleap-cobol-parser</artifactId>
  <version>4.0.0</version>
</dependency>
```

Use the following code as a starting point for developing own code.

### Simple: Generate an Abstract Semantic Graph (ASG) from COBOL code

```java
// generate ASG from plain COBOL code
java.io.File inputFile = new java.io.File("src/test/resources/io/proleap/cobol/asg/HelloWorld.cbl");
io.proleap.cobol.preprocessor.CobolPreprocessor.CobolSourceFormatEnum format = io.proleap.cobol.preprocessor.CobolPreprocessor.CobolSourceFormatEnum.TANDEM;
io.proleap.cobol.asg.metamodel.Program program = new io.proleap.cobol.asg.runner.impl.CobolParserRunnerImpl().analyzeFile(inputFile, format);

// navigate on ASG
io.proleap.cobol.asg.metamodel.CompilationUnit compilationUnit = program.getCompilationUnit("HelloWorld");
io.proleap.cobol.asg.metamodel.ProgramUnit programUnit = compilationUnit.getProgramUnit();
io.proleap.cobol.asg.metamodel.data.DataDivision dataDivision = programUnit.getDataDivision();
io.proleap.cobol.asg.metamodel.data.datadescription.DataDescriptionEntry dataDescriptionEntry = dataDivision.getWorkingStorageSection().getDataDescriptionEntry("ITEMS");
Integer levelNumber = dataDescriptionEntry.getLevelNumber();
```

### Complex: Generate an Abstract Semantic Graph (ASG) and traverse the Abstract Syntax Tree (AST)

// traverse the AST
io.proleap.cobol.CobolBaseVisitor<Boolean> visitor = new io.proleap.cobol.CobolBaseVisitor<Boolean>() {
  @Override
  public Boolean visitDataDescriptionEntryFormat1(final io.proleap.cobol.CobolParser.DataDescriptionEntryFormat1Context ctx) {
    io.proleap.cobol.asg.metamodel.data.datadescription.DataDescriptionEntry entry = (io.proleap.cobol.asg.metamodel.data.datadescription.DataDescriptionEntry) program.getASGElementRegistry().getASGElement(ctx);
    String name = entry.getName();

return visitChildren(ctx);
  }
};

for (final io.proleap.cobol.asg.metamodel.CompilationUnit compilationUnit : program.getCompilationUnits()) {
  visitor.visit(compilationUnit.getCtx());
}
```

Where to look next
------------------

- [ANTLR4 COBOL grammar](src/main/antlr4/io/proleap/cobol/Cobol.g4)
- [ANTLR4 COBOL preprocessor grammar](src/main/antlr4/io/proleap/cobol/CobolPreprocessor.g4)
- [Unit test code examples](src/test/java/io/proleap/cobol/asg/data/workingstorage)
- [ProLeap analyzer, interpreter & transformer for COBOL](https://github.com/proleap/proleap-cobol)

How to cite
-----------

Please cite ProLeap COBOL parser in your publications, if it helps your research. Here is an example BibTeX entry:

```
@misc{wolffgang2018cobol,
  title={ProLeap COBOL parser},
  author={Wolffgang, Ulrich and others},
  year={2018},
  howpublished={\url{https://github.com/uwol/proleap-cobol-parser}},
}
```

Features
--------

* `EXEC SQL` statements, `EXEC SQLIMS` statements and `EXEC CICS` statements are extracted by the preprocessor and provided as texts in the ASG.
* Passes the [NIST test suite](https://www.itl.nist.gov/div897/ctg/cobol_form.htm).
* Rigorous test-driven development.
* To be used in conjunction with the provided preprocessor, which executes `COPY`, `REPLACE`, `CBL` and `PROCESS` statements.

Build process
-------------

The build process is based on Maven (version 3 or higher). Building requires a JDK 17 and generates a Maven JAR, which can be used in other Maven projects as a dependency.

* Clone or download the repository.
* In [Eclipse](https://eclipse.org) import the directory as a an `existing Maven project`.
* To build, run:

```
$ mvn clean package
```

* The test suite executes AST and ASG tests against COBOL test code and NIST test files. NIST test files come from [Koopa repo](https://github.com/krisds/koopa/tree/master/testsuite/cobol85). Unit tests and parse tree files were generated by class `io.proleap.cobol.TestGenerator` from COBOL test files. The generator derives the COBOL line format from the containing folder name.
* You should see output like this:

```
[INFO] Scanning for projects...
...
-------------------------------------------------------
 T E S T S
-------------------------------------------------------
Running io.proleap.cobol.ast.fixed.FixedTest
Preprocessing file Fixed.cbl.
Parsing file Fixed.cbl.
Comparing parse tree with file Fixed.cbl.tree.
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 6.202 sec
Running io.proleap.cobol.ast.fixed.QuotesInCommentEntryTest
...
Results :

Tests run: 680, Failures: 0, Errors: 0, Skipped: 0

[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
```

* To install the JAR in your local Maven repository:

```
$ mvn clean install
```

* To only run the tests:

```
$ mvn clean test
```

Release process
---------------

* Milestones of the grammar are published in the [ANTLR grammars repo](https://github.com/antlr/grammars-v4).

License
-------

Licensed under the MIT License. See LICENSE for details.

proleap-cobol-parser

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