${fooStr}

`); //sanity check //console.log(fooStr); //// Using Acorn //// //pass string to acorn parser let ast = acorn.parse(fooStr, {ecmaVersion:2020, locations:true}); //sanity check //console.log(ast); //use acorn.walk to traverse ast console.log("Full walk using acorn.walk:\n------------"); acorn.walk.full(ast, node =>{ console.log(`node type: ${node.type} loc: ${node.start}`); }); console.log("=============\n"); console.log("Simple walk, find and identify VariableDeclarators:\n-------------"); acorn.walk.simple(ast, { VariableDeclarator(node){ console.log(`variable declarator ${node.id.name} at: ${node.start}`); } }); console.log("=============\n"); console.log("find and identify Literals:\n-------------"); acorn.walk.simple(ast, { Literal(node){ console.log(`literal: ${node.value} at line: ${node.loc.start.line}`); } }); console.log("=============\n"); //display the code as JSON console.log("AST JSON:\n-------------") let astJson = JSON.stringify(ast,null,1); console.log(astJson); console.log("=============\n") //display all variable names let varnames = []; acorn.walk.simple(ast, { VariableDeclarator(node){ varnames.push(node.id.name); console.log(`variable name: ${node.id.name}`); } }); console.log("\n=============\n") //finally, display the value of the variables acorn.walk.simple(ast, { VariableDeclarator(node){ for(let n of varnames){ if(node.id.name==n){ document.write(`

${n} = ${node.init.value} at line ${node.loc.start.line}

`); //console.log(`${n} = ${node.init.value}`); } } } }); //console.log("\n=============\n") //display astJson in page, different colors col = "white"; bg = "teal"; document.write(`

${astJson}

`); }

acornParserTest