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import {isArray} from 'vega-util';
var CACHE = '_:mod:_';
/**
* Hash that tracks modifications to assigned values.
* Callers *must* use the set method to update values.
*/
export default function Parameters() {
Object.defineProperty(this, CACHE, {writable: true, value: {}});
}
var prototype = Parameters.prototype;
/**
* Set a parameter value. If the parameter value changes, the parameter
* will be recorded as modified.
* @param {string} name - The parameter name.
* @param {number} index - The index into an array-value parameter. Ignored if
* the argument is undefined, null or less than zero.
* @param {*} value - The parameter value to set.
* @param {boolean} [force=false] - If true, records the parameter as modified
* even if the value is unchanged.
* @return {Parameters} - This parameter object.
*/
prototype.set = function(name, index, value, force) {
var o = this,
v = o[name],
mod = o[CACHE];
if (index != null && index >= 0) {
if (v[index] !== value || force) {
v[index] = value;
mod[index + ':' + name] = -1;
mod[name] = -1;
}
} else if (v !== value || force) {
o[name] = value;
mod[name] = isArray(value) ? 1 + value.length : -1;
}
return o;
};
/**
* Tests if one or more parameters has been modified. If invoked with no
* arguments, returns true if any parameter value has changed. If the first
* argument is array, returns trues if any parameter name in the array has
* changed. Otherwise, tests if the given name and optional array index has
* changed.
* @param {string} name - The parameter name to test.
* @param {number} [index=undefined] - The parameter array index to test.
* @return {boolean} - Returns true if a queried parameter was modified.
*/
prototype.modified = function(name, index) {
var mod = this[CACHE], k;
if (!arguments.length) {
for (k in mod) { if (mod[k]) return true; }
return false;
} else if (isArray(name)) {
for (k=0; k<name.length; ++k) {
if (mod[name[k]]) return true;
}
return false;
}
return (index != null && index >= 0)
? (index + 1 < mod[name] || !!mod[index + ':' + name])
: !!mod[name];
};
/**
* Clears the modification records. After calling this method,
* all parameters are considered unmodified.
*/
prototype.clear = function() {
this[CACHE] = {};
return this;
};