LineChopper

Classes

LineChopper

LineChopper(rootSwitch, initialState = {}, options = defaultOptions)

reset() parse() getState() getCount()

Switch

Switch is an easy way to choose what type of object the line represents.

Switch Usage

new Switch(options)

Switch Options

A number of options are available for each Switch object. These can aid in the processing of more complex line structures

• is: line => bool
• filter: (state, line, i, prevLines) => bool
• pre: (state, line, i, prevLines) => {}
• post: (state, record) => {}
• cases: { id: (state, line, i, prevLines) => {} }
• def: (state, line, i, prevLines) => {}

Switch Example

const SampleSwitch = new Switch({
  is: line => [line.slice(0, 3), line.slice(4, 5)],
  filter: (state, line) => line.slice(1, 4) === "USA",
  cases: {
    HDR: Header,
    A: MORA,
    D: Navaid,
    E: Enroute,
    P: Airport
  }
});

Schema

Schema is the core class used for individual types of objects.

Schema Usage

new Schema(options, elements)

Schema Options

A number of options are available for each Schema object. These can aid in the processing of more complex line structures

• name: {String} Schema name - helps with debugging output
• desc: {String} Schema description - helps with documentation
• allowDuplicateNames: {Boolean: default=false}
• initialState: {Object} Initial state object
• filter: (): Return false to not consider
• pre: (state, line)
• post: (state, line, i, prevLines, obj)
• noGaps: {Boolean: default=true

Schema Example

const MORA = new Schema(
  {
    name: "MORA",
    desc: "4.1.9.1",
    initialState: { vals: [] },
    post: (state, line, i, prevLines, obj) => {
        state.foo = obj;
    }
  },
  [
    [0, 1, String, ["S", "T"], Skip, "recordType"], // 5.2 Record Type
    [4, 1, String, Skip, "section"],  // 5.4 Section Code
    [5, 1, TString, Skip, "subsection"], // 5.5 Subsection Code
    [6, 7], // Blank
    [13, 3, TString, Req, StartLat, "startLat"], // 5.141 Starting Latitude
    [16, 4, TString, Req, StartLon, "startLon"], // 5.142 Starting Longitude
    [20, 3], // Blank
    [23, 5, Number, Req, "recNum"], // 5.31 File Record Number
    [28, 4, Number, Req, "cycle"] // 5.32 Cycle
  ]
);