story.js

'use strict';

var Path = require('./path');

module.exports = class Story {
    constructor() {
        this.states = {};
        this.errors = [];
        Object.seal(this);
    }

    create(path, type, arg, position) {
        var name = Path.toName(path);
        var Node = this.constructors[type];
        if (!Node) {
            throw new Error('No node constructor for type: ' + type);
        }
        var node = new Node(arg);
        node.position = position;
        this.states[name] = node;
        return node;
    }

    error(error) {
        this.errors.push(error);
    }

    constructors = {

        text: class Text {
            constructor(text) {
                this.type = 'text';
                this.text = text;
                this.lift = ' ';
                this.drop = ' ';
                this.next = 'RET';
                this.position = null;
                Object.seal(this);
            }
        },

        echo: class Echo {
            constructor(expression) {
                this.type = 'echo';
                this.expression = expression;
                this.lift = '';
                this.drop = '';
                this.next = 'RET';
                this.position = null;
                Object.seal(this);
            }
        },

        option: class Option {
            constructor(_label) {
                this.type = 'opt';
                this.question = [];
                this.answer = [];
                this.keywords = null;
                this.next = 'RET';
                this.position = null;
                Object.seal(this);
            }
        },

        goto: class Goto {
            constructor(next) {
                this.type = 'goto';
                this.next = next;
                this.position = null;
                Object.seal(this);
            }
        },

        call: class Call {
            constructor(label) {
                this.type = 'call';
                this.label = label;
                this.args = null;
                this.next = 'RET';
                this.branch = 'RET';
                this.position = null;
                Object.seal(this);
            }
        },

        cue: class Cue {
            constructor(cue) {
                this.type = 'cue';
                this.cue = cue;
                this.next = 'RET';
                this.position = null;
                Object.seal(this);
            }
        },

        def: class Def {
            constructor(locals) {
                this.type = 'def';
                this.locals = locals;
                this.next = 'RET';
                this.position = null;
                Object.seal(this);
            }
        },

        jump: class Jump {
            constructor(condition) {
                this.type = 'jump';
                this.condition = condition;
                this.branch = 'RET';
                this.next = 'RET';
                this.position = null;
                Object.seal(this);
            }
        },

        switch: class Switch {
            constructor(expression) {
                this.type = 'switch';
                this.expression = expression;
                this.variable = null;
                this.value = 0;
                this.mode = null;
                this.branches = [];
                this.weights = [];
                this.next = 'RET';
                this.position = null;
                Object.seal(this);
            }
        },

        move: class Move {
            constructor() {
                this.type = 'move';
                this.source = null;
                this.target = null;
                this.next = 'RET';
                this.position = null;
                Object.seal(this);
            }
        },

        break: class Break {
            constructor() {
                this.type = 'br';
                this.next = 'RET';
                this.position = null;
                Object.seal(this);
            }
        },

        paragraph: class Paragraph {
            constructor() {
                this.type = 'par';
                this.next = 'RET';
                this.position = null;
                Object.seal(this);
            }
        },

        rule: class Rule {
            constructor() {
                this.type = 'rule';
                this.next = 'RET';
                this.position = null;
                Object.seal(this);
            }
        },

        ask: class Ask {
            constructor() {
                this.type = 'ask';
                this.position = null;
                Object.seal(this);
            }
        },

        read: class Read {
            constructor(variable) {
                this.type = 'read';
                this.next = 'RET';
                this.variable = variable;
                this.cue = null;
                this.position = null;
                Object.seal(this);
            }
        },

    }
}