There are 6 previous versions of this script.
// ==UserScript==
// @name US to Metric
// @namespace http://odyniec.net/
// @description Convert US measurement units to their metric counterparts
// @include http://*
// @include https://*
// ==/UserScript==
var _US_to_Metric_regexps = {
miles_per_hour: [
/((?:\.[0-9]|[0-9])[0-9., /]*)(\s|-)*m\.?p\.?h\.?(?=\W|$)/i, /* 12.34 mph */
/* 12.34 miles per hour */
/((?:\.[0-9]|[0-9])[0-9., /]*)(\s|-)*miles?\s+per\s+hour(?=\W|$)/i
],
inches: [
/((?:\.[0-9]|[0-9])[0-9., /x]*)\s*(")/, /* 12.34" */
/((?:\.[0-9]|[0-9])[0-9., /x]*)(\s|-)*in(ch)?(es)?(?=\W|$)/i /* 12.34 inches */
],
feet: [
/((?:\.[0-9]|[0-9])[0-9., /x]*)(\s|-)*f(oo|ee)?t(?=\W|$)/i /* 12.34 ft, 12-feet */
],
yards: [
/((?:\.[0-9]|[0-9])[0-9., /x]*)(\s|-)*y(ar)?ds?(?=\W|$)/i /* 12.34 yds, 12.34 yards */
],
miles: [
/((?:\.[0-9]|[0-9])[0-9., /x]*)(\s|-)*mi(le)?s?(?=\W|$)/i /* 12.34 miles */
],
ounces: [
/((?:\.[0-9]|[0-9])[0-9., /]*)(\s|-)*o(z|unces?)(?=\W|$)/i /* 12 oz, 12 ounces */
],
pounds: [
/((?:\.[0-9]|[0-9])[0-9., /]*)(\s|-)*lbs?(?=\W|$)/i, /* 12.34 lbs */
/((?:\.[0-9]|[0-9])[0-9., /]*)(\s|-)*pounds?(?=\W|$)/i /* 12.34 pounds */
],
fluid_ounces: [
/* 12 fl oz, 12 fluid ounces */
/((?:\.[0-9]|[0-9])[0-9., /]*)(\s|-)*(u\.?s\.?\s)?fl(uid)?(\s|\.\s?)o(z|unces?)(?=\W|$)/i
],
gallons: [
/* 12.34 gal, 12.34 US gallon */
/((?:\.[0-9]|[0-9])[0-9., /x]*)(\s|-)*(u\.?s\.?\s)?gal(lon)?(?=\W|$)/i
],
fahrenheit: [
/([-−]?[ ]*(?:\.[0-9]|[0-9])[0-9., /]*)\s*°\s*F(?=\W|$)/, /* 34 °F */
/* 34 degrees Fahrenheit */
/([-−]?[ ]*(?:\.[0-9]|[0-9])[0-9., /]*)\s*deg(rees)?\s+f(ahrenheit)?(?=\W|$)/i
],
next: [ ]
};
function _US_to_Metric_click(event)
{
if (event.ctrlKey) {
var t, nodes, switched = /_US_to_Metric_switched/.test(this.className);
if (event.shiftKey)
nodes = document.getElementsByClassName('_US_to_Metric_value');
else
nodes = [ this ];
for (var i = 0; i < nodes.length; i++)
if (switched) {
nodes[i].className = nodes[i].className.replace(' _US_to_Metric_switched', '');
nodes[i].childNodes[0].nodeValue = nodes[i].title.split(/ = /)[0];
}
else {
nodes[i].className = nodes[i].className.replace(' _US_to_Metric_switched', '');
nodes[i].childNodes[0].nodeValue = nodes[i].title.split(/ = /)[1];
nodes[i].className += ' _US_to_Metric_switched';
}
event.preventDefault();
return false;
}
}
function _US_to_Metric()
{
var nodes, textNodes = [ ];
var text, mode, r, pre, post, parent, span, t, tt, n, i;
var regexps = _US_to_Metric_regexps;
var excluded = { option: 1, script: 1, textarea: 1 };
nodes = document.evaluate('//body//text()', document, null,
XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE, null);
for (i = 0; i < nodes.snapshotLength; i++)
textNodes.push(nodes.snapshotItem(i));
i = 0;
while (i < textNodes.length) {
if (textNodes[i].parentNode &&
excluded[textNodes[i].parentNode.tagName.toLowerCase()])
{
i++;
continue;
}
text = textNodes[i].nodeValue;
if (!text || !text.match(/[0-9]/)) {
i++;
continue;
}
LOOP:
for (mode in regexps)
for (var j = 0; j < regexps[mode].length; j++)
if (t = regexps[mode][j].exec(text))
break LOOP;
if (mode == 'next') {
i++;
continue;
}
if (tt = t[1].match(/([0-9]+)\s+([0-9]+)\/([0-9]+)/))
t[1] = (parseFloat(tt[1]) + tt[2] / tt[3]).toString();
t[1] = t[1].replace(/\s+/g, '');
t[1] = t[1].replace(',', '');
t[1] = t[1].replace('−', '-');
n = t[1].split(/x/);
for (j = 0; j < n.length; j++)
if (tt = n[j].match(/([0-9]+)\/([0-9]+)/))
n[j] = tt[1] / tt[2];
switch (mode) {
case 'miles_per_hour':
for (j = 0; j < n.length; j++)
n[j] = (parseFloat(n[j]) * 1.609344).toFixed(2);
r = n.join(' x ') + ' km/h';
break;
case 'inches':
for (j = 0; j < n.length; j++)
n[j] = (parseFloat(n[j]) * 2.54).toFixed(2);
r = n.join(' x ') + ' cm';
break;
case 'feet':
for (j = 0; j < n.length; j++)
n[j] = (parseFloat(n[j]) * 0.3048).toFixed(2);
r = n.join(' x ') + ' m';
break;
case 'yards':
for (j = 0; j < n.length; j++)
n[j] = (parseFloat(n[j]) * 0.9144).toFixed(2);
r = n.join(' x ') + ' m';
break;
case 'miles':
for (j = 0; j < n.length; j++)
n[j] = (parseFloat(n[j]) * 1.609344).toFixed(2);
r = n.join(' x ') + ' km';
break;
case 'ounces':
for (j = 0; j < n.length; j++)
n[j] = (parseFloat(n[j]) * 28.349523125).toFixed(2);
r = n.join(' x ') + ' g';
break;
case 'pounds':
for (j = 0; j < n.length; j++)
n[j] = (parseFloat(n[j]) * 0.45359237).toFixed(2);
r = n.join(' x ') + ' kg';
break;
case 'fluid_ounces':
for (j = 0; j < n.length; j++)
n[j] = (parseFloat(n[j]) * 29.57353).toFixed(2);
r = n.join(' x ') + ' mL';
break;
case 'gallons':
for (j = 0; j < n.length; j++)
n[j] = (parseFloat(n[j]) * 3.78541178).toFixed(2);
r = n.join(' x ') + ' L';
break;
case 'fahrenheit':
for (j = 0; j < n.length; j++)
n[j] = ((parseFloat(n[j]) - 32) * 5 / 9).toFixed(2);
r = n.join(' x ') + ' °C';
break;
}
pre = document.createTextNode(text.slice(0, text.indexOf(t[0])));
post = document.createTextNode(text.slice(text.indexOf(t[0]) + t[0].length));
span = document.createElement('span');
span.appendChild(document.createTextNode(t[0]));
t[0] = t[0].replace(/\s+/g, ' ');
span.setAttribute('title', t[0] + ' = ' + r);
span.className = '_US_to_Metric_value';
span.style.cursor = 'pointer';
span.addEventListener('click', _US_to_Metric_click, false);
span.style.color = 'inherit';
span.style.fontSize = 'inherit';
span.style.fontWeight = 'inherit';
parent = textNodes[i].parentNode;
parent.replaceChild(post, textNodes[i]);
parent.insertBefore(span, post);
parent.insertBefore(pre, span);
textNodes[i] = pre;
textNodes.push(post);
}
}
_US_to_Metric();
