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constructor(pure) {
this.pure = pure;
/**
* global results store
* currently uniqueness is global to entire pure instance
* this means that pure should currently *never* return
* duplicate values across all API methods when using `pure.unique`
* it's possible in the future that some users may want to scope
* found per function call instead of pure instance
*/
this.globalFound = {};
/**
* scoped results store
*/
this.scopedFound = {};
/**
* global exclude list of results
* defaults to nothing excluded
*/
this.exclude = [];
this.startTime = 0;
this.currentIterations = 0;
/**
* uniqueness compare function
* default behavior is to check value as key against object hash
*/
this.defaultCompare = (obj, key) => {
if (typeof obj[key] === 'undefined') {
return -1;
}
return 0;
};
this.errorMessage = (now, code) => {
throw new Error(`
Started time: ${now}
${code} for uniqueness check.
May not be able to generate any more unique values with current settings.
Try adjusting maxTime or maxRetries parameters for pure.unique()`);
};
this.setStartTime = () => {
if (this.startTime === 0) {
this.startTime = new Date().getTime();
}
};
this.setCurrentIterations = () => {
if (!this.currentIterations > 0) {
this.currentIterations = 0;
}
};
}
exec(method, args, opts = {}) {
const options = opts;
const now = new Date().getTime();
this.setStartTime();
this.setCurrentIterations();
if (typeof options.maxTime !== 'number') {
options.maxTime = 50;
}
if (typeof options.maxRetries !== 'number') {
options.maxRetries = 500;
}
if (typeof options.scope !== 'string') {
options.scope = undefined;
}
options.exclude = options.exclude || this.exclude;
options.compare = options.compare || this.defaultCompare;
let found = {};
// scope definition
if (options.scope) {
if (!this.scopedFound[options.scope]) {
this.scopedFound[options.scope] = {};
}
found = this.scopedFound[options.scope];
} else {
found = this.globalFound;
}
// support single exclude argument as string
if (typeof options.exclude === 'string') {
options.exclude = [options.exclude];
}
if (now - this.startTime >= options.maxTime) {
return this.errorMessage(now, `Exceeded maxTime: ${options.maxTime}`);
}
if (this.currentIterations >= options.maxRetries) {
return this.errorMessage(now, `Exceeded maxRetries: ${options.maxRetries}`);
}
// execute the provided method to find a potential satifised value
const result = method.apply({ pure: this.pure }, args);
// if the result has not been previously found, add it to the found array and return the value as it's unique
if (options.compare(found, result) === -1 && options.exclude.indexOf(result) === -1) {
found[result] = result;
this.exclude = [];
this.startTime = 0;
this.currentIterations = 0;
return result;
}
this.currentIterations += 1;
return this.exec(method, args, options);
}
clear(scope) {
if (scope) {
if (this.scopedFound[scope]) {
this.scopedFound[scope] = undefined;
}
} else {
this.globalFound = {};
}
}
}
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