All files / xstate/es graph.js

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var __rest = this && this.__rest || function (s, e) {
    var t = {};
    for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0) t[p] = s[p];
    if (s != null && typeof Object.getOwnPropertySymbols === "function") for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) if (e.indexOf(p[i]) < 0) t[p[i]] = s[p[i]];
    return t;
};
var __read = this && this.__read || function (o, n) {
    var m = typeof Symbol === "function" && o[Symbol.iterator];
    if (!m) return o;
    var i = m.call(o),
        r,
        ar = [],
        e;
    try {
        while ((n === void 0 || n-- > 0) && !(r = i.next()).done) ar.push(r.value);
    } catch (error) {
        e = { error: error };
    } finally {
        try {
            if (r && !r.done && (m = i["return"])) m.call(i);
        } finally {
            if (e) throw e.error;
        }
    }
    return ar;
};
var __spread = this && this.__spread || function () {
    for (var ar = [], i = 0; i < arguments.length; i++) ar = ar.concat(__read(arguments[i]));
    return ar;
};
var __values = this && this.__values || function (o) {
    var m = typeof Symbol === "function" && o[Symbol.iterator],
        i = 0;
    if (m) return m.call(o);
    return {
        next: function () {
            if (o && i >= o.length) o = void 0;
            return { value: o && o[i++], done: !o };
        }
    };
};
import { State } from './index';
import { toStateValue, getActionType, flatten, keys } from './utils';
var EMPTY_MAP = {};
export function getNodes(node) {
    var states = node.states;
    var nodes = keys(states).reduce(function (accNodes, stateKey) {
        var subState = states[stateKey];
        var subNodes = getNodes(states[stateKey]);
        accNodes.push.apply(accNodes, __spread([subState], subNodes));
        return accNodes;
    }, []);
    return nodes;
}
export function getEventEdges(node, event) {
    var transitions = node.definition.on[event];
    return flatten(transitions.map(function (transition) {
        var targets = transition.target ? [].concat(transition.target) : undefined;
        if (!targets) {
            return [{
                source: node,
                target: node,
                event: event,
                actions: transition.actions ? transition.actions.map(getActionType) : [],
                cond: transition.cond,
                transition: transition
            }];
        }
        return targets.map(function (target) {
            try {
                var targetNode = target ? node.getRelativeStateNodes(target, undefined, false)[0] : node;
                return {
                    source: node,
                    target: targetNode,
                    event: event,
                    actions: transition.actions ? transition.actions.map(getActionType) : [],
                    cond: transition.cond,
                    transition: transition
                };
            } catch (e) {
                // tslint:disable-next-line:no-console
                console.warn("Target '" + target + "' not found on '" + node.id + "'");
                return undefined;
            }
        }).filter(function (maybeEdge) {
            return maybeEdge !== undefined;
        });
    }));
}
export function getEdges(node, options) {
    var _a = (options || {}).depth,
        depth = _a === void 0 ? null : _a;
    var edges = [];
    if (node.states && depth === null) {
        keys(node.states).forEach(function (stateKey) {
            edges.push.apply(edges, __spread(getEdges(node.states[stateKey])));
        });
    } else if (depth && depth > 0) {
        keys(node.states).forEach(function (stateKey) {
            edges.push.apply(edges, __spread(getEdges(node.states[stateKey], { depth: depth - 1 })));
        });
    }
    keys(node.on).forEach(function (event) {
        edges.push.apply(edges, __spread(getEventEdges(node, event)));
    });
    return edges;
}
export function getAdjacencyMap(node, context) {
    var adjacency = {};
    var events = node.events;
    function findAdjacencies(stateValue) {
        var e_1, _a;
        var stateKey = JSON.stringify(stateValue);
        if (adjacency[stateKey]) {
            return;
        }
        adjacency[stateKey] = {};
        try {
            for (var events_1 = __values(events), events_1_1 = events_1.next(); !events_1_1.done; events_1_1 = events_1.next()) {
                var event_1 = events_1_1.value;
                var nextState = node.transition(stateValue, event_1, context);
                adjacency[stateKey][event_1] = { state: nextState.value };
                findAdjacencies(nextState.value);
            }
        } catch (e_1_1) {
            e_1 = { error: e_1_1 };
        } finally {
            try {
                if (events_1_1 && !events_1_1.done && (_a = events_1.return)) _a.call(events_1);
            } finally {
                if (e_1) throw e_1.error;
            }
        }
    }
    findAdjacencies(node.initialState.value);
    return adjacency;
}
function eventToString(event) {
    if (typeof event === 'string' || typeof event === 'number') {
        return "" + event;
    }
    // @ts-ignore - TODO: fix?
    var type = event.type,
        rest = __rest(event, ["type"]);
    return type + " | " + JSON.stringify(rest);
}
export function deserializeStateString(valueContextString) {
    var _a = __read(valueContextString.split(' | '), 2),
        valueString = _a[0],
        contextString = _a[1];
    return {
        value: JSON.parse(valueString),
        context: JSON.parse(contextString)
    };
}
export function serializeState(state) {
    var value = state.value,
        context = state.context;
    return JSON.stringify(value) + ' | ' + JSON.stringify(context);
}
export function getValueAdjacencyMap(node, options) {
    var events = options.events,
        filter = options.filter;
    var adjacency = {};
    var potentialEvents = flatten(
    // @ts-ignore
    node.events.map(function (event) {
        return events[event] || [event];
    }));
    function findAdjacencies(state) {
        var e_2, _a;
        var stateKey = serializeState(state);
        if (adjacency[stateKey]) {
            return;
        }
        adjacency[stateKey] = {};
        try {
            for (var potentialEvents_1 = __values(potentialEvents), potentialEvents_1_1 = potentialEvents_1.next(); !potentialEvents_1_1.done; potentialEvents_1_1 = potentialEvents_1.next()) {
                var event_2 = potentialEvents_1_1.value;
                var nextState = node.transition(state, event_2);
                if (!filter || filter(nextState)) {
                    adjacency[stateKey][eventToString(event_2)] = {
                        value: nextState.value,
                        context: nextState.context
                    };
                    findAdjacencies(nextState);
                }
            }
        } catch (e_2_1) {
            e_2 = { error: e_2_1 };
        } finally {
            try {
                if (potentialEvents_1_1 && !potentialEvents_1_1.done && (_a = potentialEvents_1.return)) _a.call(potentialEvents_1);
            } finally {
                if (e_2) throw e_2.error;
            }
        }
    }
    findAdjacencies(node.initialState);
    return adjacency;
}
export function getShortestValuePaths(machine, options) {
    if (!machine.states) {
        return EMPTY_MAP;
    }
    var adjacency = getValueAdjacencyMap(machine, options);
    var pathMap = {};
    var visited = new Set();
    function util(state) {
        var e_3, _a, e_4, _b;
        var stateKey = serializeState(state);
        visited.add(stateKey);
        var eventMap = adjacency[stateKey];
        try {
            for (var _c = __values(keys(eventMap)), _d = _c.next(); !_d.done; _d = _c.next()) {
                var event_3 = _d.value;
                var _e = eventMap[event_3],
                    value = _e.value,
                    context_1 = _e.context;
                if (!value) {
                    continue;
                }
                var nextState = State.from(value, context_1);
                var nextStateId = serializeState(nextState);
                if (!pathMap[nextStateId] || pathMap[nextStateId].length > pathMap[stateKey].length + 1) {
                    pathMap[nextStateId] = __spread(pathMap[stateKey] || [], [{ state: value, event: event_3 }]);
                }
            }
        } catch (e_3_1) {
            e_3 = { error: e_3_1 };
        } finally {
            try {
                if (_d && !_d.done && (_a = _c.return)) _a.call(_c);
            } finally {
                if (e_3) throw e_3.error;
            }
        }
        try {
            for (var _f = __values(keys(eventMap)), _g = _f.next(); !_g.done; _g = _f.next()) {
                var event_4 = _g.value;
                var _h = eventMap[event_4],
                    value = _h.value,
                    context_2 = _h.context;
                if (!value) {
                    continue;
                }
                var nextState = State.from(value, context_2);
                var nextStateId = serializeState(State.from(value, context_2));
                if (visited.has(nextStateId)) {
                    continue;
                }
                util(nextState);
            }
        } catch (e_4_1) {
            e_4 = { error: e_4_1 };
        } finally {
            try {
                if (_g && !_g.done && (_b = _f.return)) _b.call(_f);
            } finally {
                if (e_4) throw e_4.error;
            }
        }
        return pathMap;
    }
    util(machine.initialState);
    return pathMap;
}
export function getShortestPaths(machine, context) {
    var _a;
    if (!machine.states) {
        return EMPTY_MAP;
    }
    var adjacency = getAdjacencyMap(machine, context);
    var initialStateId = JSON.stringify(machine.initialState.value);
    var pathMap = (_a = {}, _a[initialStateId] = [], _a);
    var visited = new Set();
    function util(stateValue) {
        var e_5, _a, e_6, _b;
        var stateId = JSON.stringify(stateValue);
        visited.add(stateId);
        var eventMap = adjacency[stateId];
        try {
            for (var _c = __values(keys(eventMap)), _d = _c.next(); !_d.done; _d = _c.next()) {
                var event_5 = _d.value;
                var nextStateValue = eventMap[event_5].state;
                if (!nextStateValue) {
                    continue;
                }
                var nextStateId = JSON.stringify(toStateValue(nextStateValue, machine.delimiter));
                if (!pathMap[nextStateId] || pathMap[nextStateId].length > pathMap[stateId].length + 1) {
                    pathMap[nextStateId] = __spread(pathMap[stateId] || [], [{ state: stateValue, event: event_5 }]);
                }
            }
        } catch (e_5_1) {
            e_5 = { error: e_5_1 };
        } finally {
            try {
                if (_d && !_d.done && (_a = _c.return)) _a.call(_c);
            } finally {
                if (e_5) throw e_5.error;
            }
        }
        try {
            for (var _e = __values(keys(eventMap)), _f = _e.next(); !_f.done; _f = _e.next()) {
                var event_6 = _f.value;
                var nextStateValue = eventMap[event_6].state;
                if (!nextStateValue) {
                    continue;
                }
                var nextStateId = JSON.stringify(nextStateValue);
                if (visited.has(nextStateId)) {
                    continue;
                }
                util(nextStateValue);
            }
        } catch (e_6_1) {
            e_6 = { error: e_6_1 };
        } finally {
            try {
                if (_f && !_f.done && (_b = _e.return)) _b.call(_e);
            } finally {
                if (e_6) throw e_6.error;
            }
        }
        return pathMap;
    }
    util(machine.initialState.value);
    return pathMap;
}
export function getShortestPathsAsArray(machine, context) {
    var result = getShortestPaths(machine, context);
    return keys(result).map(function (key) {
        return {
            state: JSON.parse(key),
            path: result[key]
        };
    });
}
export function getSimplePaths(machine, context) {
    if (!machine.states) {
        return EMPTY_MAP;
    }
    var adjacency = getAdjacencyMap(machine, context);
    var visited = new Set();
    var path = [];
    var paths = {};
    function util(fromPathId, toPathId) {
        var e_7, _a;
        visited.add(fromPathId);
        if (fromPathId === toPathId) {
            paths[toPathId] = paths[toPathId] || [];
            paths[toPathId].push(__spread(path));
        } else {
            try {
                for (var _b = __values(keys(adjacency[fromPathId])), _c = _b.next(); !_c.done; _c = _b.next()) {
                    var subEvent = _c.value;
                    var nextStateValue = adjacency[fromPathId][subEvent].state;
                    if (!nextStateValue) {
                        continue;
                    }
                    var nextStateId = JSON.stringify(nextStateValue);
                    if (!visited.has(nextStateId)) {
                        path.push({ state: JSON.parse(fromPathId), event: subEvent });
                        util(nextStateId, toPathId);
                    }
                }
            } catch (e_7_1) {
                e_7 = { error: e_7_1 };
            } finally {
                try {
                    if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
                } finally {
                    if (e_7) throw e_7.error;
                }
            }
        }
        path.pop();
        visited.delete(fromPathId);
    }
    var initialStateId = JSON.stringify(machine.initialState.value);
    keys(adjacency).forEach(function (nextStateId) {
        util(initialStateId, nextStateId);
    });
    return paths;
}
export function getSimplePathsAsArray(machine, context) {
    var result = getSimplePaths(machine, context);
    return keys(result).map(function (key) {
        return {
            state: JSON.parse(key),
            paths: result[key]
        };
    });
}