MediaWiki:CalculateMass.js

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addOnloadHook(calculateMassInit); 

var EXT_MASS = {
	"C":  12.0,
	"H":   1.007825035,
	"O":  15.99491463,
	"N":  14.003074002,
	"S":  31.97207070,
	"P":  30.9737620,
	"Na": 22.9897677,
	"K":  38.9637074,
	"Ca": 39.9625906
}

var AVE_MASS = {
	"C":  12.0107,
	"H":   1.00794,
	"O":  15.9994,
	"N":  14.00674,
	"S":  32.066,
	"P":  30.973761,
	"Na": 22.98977,
	"K":  39.0983,
	"Ca": 40.078,
}

function calculateMassInit()
{
	document.getElementById("{{{1}}}").onclick = function(){
		var mass = calculateMassFromFormula(document.getElementById("{{{2}}}").value, false);
		document.getElementById("{{{3}}}").value = mass;
	}
}

function calculateMassFromFormula(formula, isAve)
{
	var items = splitFormula(formula);

	var total = 0;
	var masses;
	if(isAve)
		masses = AVE_MASS;
	else
		masses = EXT_MASS;
	for(var i = 0; i < items.length; i += 2){
		if(isFinite(masses[items[i]]))
			total += masses[items[i]] * items[i+1];
			//console.log(masses[items[i]], items[i+1]);
	}
	//console.log(items)
	//console.log(total)
	return total;
}

function splitFormula(formula)
{
	if(formula.length == 0) // 組成式が無い
		return [];

	var items = [];
	formula += "$"; // 番兵
	var ch = formula.substr(0, 1);
	if(ch.match(/^[^A-Z]$/)) // フォーマットがおかしい
		return [];

	var num = 1;
	for(var i = 1; i < formula.length; i ++){
		var next = formula.substr(i, 1);
		if(next.match(/^[0-9]$/)){
			// 数字が終わるまでを検索する
			for(var j = i+1; j < formula.length; j ++){
				if(formula.substr(j,1).match(/^[^0-9]$/)){
					// 終了
					num = parseInt(formula.substr(i,j-i), 10);
					i = j-1;
					break;
				}
			}

		} else if(next.match(/^[a-z]$/)){
			ch += next;

		} else if(next.match(/^[A-Z]$/)){
			items.push(ch);
			items.push(num);
			ch  = next;
			num = 1;

		} else if(next == "$"){
			items.push(ch);
			items.push(num);
			break;

		} else { // unknown
			return [];
		}
	}

	return items;
}