Headline

Parsing text to trees and walk them with ANTLR4 Visitors

Realtionships

This an ANTLR4 version of Contribution:antlrTrees using the Visitor pattern.

Illustration

Total and Cut are extensions of CompanyBaseVisitor using the visitor pattern (Visitor pattern). The BaseVisitor iterates the whole company, the extensions for Cut and Total overrides only the visit methods of the employees, whereas the PrintVisitor overrides all methods.

Example of TotalVisitor:

@Override public Float visitEmployee(@NotNull CompanyParser.EmployeeContext ctx) { 
   	
    return Float.valueOf(ctx.salary.getText());		
}

To use a visitor invoke the visit method of the wanted visitor and give the company parse tree to the visit as argument.

Example of TotalTestVisitor(some parts are omitted):

	@Test
	public void testTotal() throws RecognitionException, IOException, PrintException {
		CompanyParser parser = Parsing.parse(sampleCompany);
		parser.setBuildParseTree(true);
		ParseTree tree = parser.company(); // top rule
		// Create the visitor, whoch totals
		TotalVisitor t= new TotalVisitor();

		assertEquals(399747, t.visit(tree) , 0); 
		
	}

Usage

This contribution uses Technology:Gradle for building. Technology:Eclipse is supported.

See https://github.com/101companies/101simplejava/blob/master/README.md

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