column.ts

// A Column that is used in a Row

import FlyweightFactory from './flyweight-factory'

export default class Column {
    // The columns are the contexts.
    // They will share the Flyweights via the FlyweightsFactory.
    // `data`, `width` and `justify` are extrinsic values. They are outside
    // of the flyweights.
    data = ''
    width = 10
    justify = 0

    getData(): string {
        // Get the flyweight value from the factory, and apply the extrinsic values
        const codes = []
        for (let i = 0; i < this.data.length; i++) {
            codes.push(this.data.charCodeAt(i))
        }
        let ret = ''
        Array.from(codes).forEach((c) => {
            ret = ret + String.fromCharCode(FlyweightFactory.getFlyweight(c).code)
        })

        switch (this.justify) {
            case 1:
                ret = this.leftAlign(this.width, ret, ' ')
                break
            case 2:
                ret = this.rightAlign(this.width, ret, ' ')
                break
            default:
                ret = this.center(this.width, ret, ' ')
        }

        return ret
    }

    center(width: number, string: string, padding: string): string {
        return width <= string.length
            ? string
            : this.centerAlternate(width, padding + string, padding)
    }
    centerAlternate(width: number, string: string, padding: string): string {
        return width <= string.length
            ? string
            : this.center(width, string + padding, padding)
    }
    leftAlign(width: number, string: string, padding: string): string {
        return width <= string.length
            ? string
            : this.leftAlign(width, string + padding, padding)
    }
    rightAlign(width: number, string: string, padding: string): string {
        return width <= string.length
            ? string
            : this.rightAlign(width, padding + string, padding)
    }
}