shift-reducer

Shift Reducer

About

This module provides a reducer for a Shift format AST.

Status

Stable.

Installation

npm install shift-reducer

Usage

ES6

import reduce, {MonoidalReducer} from "shift-reducer"

class IdentifierCounter extends MonoidalReducer {
  static count(program) {
    return reduce(new this, program);
  }

  constructor() {
    super(class Sum {
      static empty() { return 0; }
      concat(a) { return this + a; }
    });
  }

  reduceIdentifierExpression(node, identifier) {
    return 1;
  }
}

IdentifierCounter.count(PROGRAM);

ES5

var reducer = require('shift-reducer');

function IdentifierCounter() {
  reducer.MonoidalReducer.call(this, {
    empty : function () { return 0; },
    concat : function (a) { return this + a; }
  });
}

IdentifierCounter.count = function(program){
  return reducer.default(new this, program);
};

IdentifierCounter.prototype = Object.create(reducer.MonoidalReducer.prototype);

IdentifierCounter.prototype.reduceIdentifierExpression = function (node, identifier) {
  return 1;
};

IdentifierCounter.count(PROGRAM);

Fantasy Land

The MonoidalReducer is compatible with Fantasy Land Monoids.

Contributing

• Open a Github issue with a description of your desired change. If one exists already, leave a message stating that you are working on it with the date you expect it to be complete.
• Fork this repo, and clone the forked repo.
• Install dependencies with npm install.
• Build and test in your environment with npm run build && npm test.
• Create a feature branch. Make your changes. Add tests.
• Build and test in your environment with npm run build && npm test.
• Make a commit that includes the text "fixes #XX" where XX is the Github issue.
• Open a Pull Request on Github.

License

Copyright 2014 Shape Security, Inc.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.