ASTRA

ASTRA is easy to use AST traverse library

Installation

npm install --save astra

Usage

var astra=require('astra');

var newAst=astra(ast)
    .when(pattern,function(chunk){

    })
    .when(anotherPattern,function(chunk){

    })
    .run();

Examples

simple

var newAst = astra(ast)
    .when({
        "type": "Literal",
        "value": "myDirective",
        "raw": "\"myDirective\""
    }, function (chunk) {
        chunk.value = "newMyDirective";
        chunk.raw = "\"newMyDirective\""
    })
    .run();

async handler ```javascript astra(ast, true) .when({ "type": "Literal", "value": "myDirective", "raw": "\"myDirective\"" }, function (chunk, done) { chunk.value = "newMyDirective"; chunk.raw = "\"newMyDirective\"" setTimeout(done, 1000); }) .run(function (err, newAst) { ... }); ```
array pattern (equivalent OR) ```javascript var newAst = astra(ast) .when([ { "type": "Literal", "value": "/app/templates/template.html"

    },
    {
        "type": "Literal",
        "value": "/app/styles/styles.css"
    }
], function (chunk) {
    chunk.value = "";
    chunk.raw = "\"\"";
})
.run();

<br>
complex pattern(** means deep child)
```javascript
var newAst=astra(ast)
    .when({
        "type": "FunctionExpression",
        "params": [
            {
                "type": "Identifier",
                "name": "$routeProvider"
            }
        ],
        "**": {
            "type": "CallExpression",
            "callee": {
                "type": "MemberExpression",
                "property": {
                    "type": "Identifier",
                    "name": "when"
                }
            },
            "**": [
                {
                    "type": "Property",
                    "key": {
                        "type": "Identifier",
                        "name": "template"
                    },
                    "value": {
                        "type": "Literal"
                    }
                },
                {
                    "type": "Property",
                    "key": {
                        "type": "Identifier",
                        "name": "styles"
                    },
                    "value": {
                        "type": "Literal"
                    }
                }
            ]
        }
    }, function (chunk) {
        chunk.value.value='';
    })
    .run();

License

MIT