| 1 | "use strict";
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| 2 | var minus = "-".charCodeAt(0);
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| 3 | var plus = "+".charCodeAt(0);
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| 4 | var dot = ".".charCodeAt(0);
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| 5 | var exp = "e".charCodeAt(0);
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| 6 | var EXP = "E".charCodeAt(0);
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| 7 | // Check if three code points would start a number
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| 8 | // https://www.w3.org/TR/css-syntax-3/#starts-with-a-number
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| 9 | function likeNumber(value) {
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| 10 | var code = value.charCodeAt(0);
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| 11 | var nextCode;
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| 12 | if (code === plus || code === minus) {
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| 13 | nextCode = value.charCodeAt(1);
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| 14 | if (nextCode >= 48 && nextCode <= 57) {
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| 15 | return true;
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| 16 | }
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| 17 | var nextNextCode = value.charCodeAt(2);
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| 18 | if (nextCode === dot && nextNextCode >= 48 && nextNextCode <= 57) {
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| 19 | return true;
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| 20 | }
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| 21 | return false;
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| 22 | }
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| 23 | if (code === dot) {
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| 24 | nextCode = value.charCodeAt(1);
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| 25 | if (nextCode >= 48 && nextCode <= 57) {
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| 26 | return true;
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| 27 | }
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| 28 | return false;
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| 29 | }
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| 30 | if (code >= 48 && code <= 57) {
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| 31 | return true;
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| 32 | }
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| 33 | return false;
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| 34 | }
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| 35 | // Consume a number
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| 36 | // https://www.w3.org/TR/css-syntax-3/#consume-number
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| 37 | module.exports = function(value) {
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| 38 | var pos = 0;
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| 39 | var length = value.length;
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| 40 | var code;
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| 41 | var nextCode;
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| 42 | var nextNextCode;
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| 43 | if (length === 0 || !likeNumber(value)) {
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| 44 | return false;
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| 45 | }
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| 46 | code = value.charCodeAt(pos);
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| 47 | if (code === plus || code === minus) {
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| 48 | pos++;
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| 49 | }
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| 50 | while(pos < length){
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| 51 | code = value.charCodeAt(pos);
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| 52 | if (code < 48 || code > 57) {
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| 53 | break;
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| 54 | }
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| 55 | pos += 1;
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| 56 | }
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| 57 | code = value.charCodeAt(pos);
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| 58 | nextCode = value.charCodeAt(pos + 1);
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| 59 | if (code === dot && nextCode >= 48 && nextCode <= 57) {
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| 60 | pos += 2;
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| 61 | while(pos < length){
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| 62 | code = value.charCodeAt(pos);
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| 63 | if (code < 48 || code > 57) {
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| 64 | break;
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| 65 | }
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| 66 | pos += 1;
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| 67 | }
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| 68 | }
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| 69 | code = value.charCodeAt(pos);
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| 70 | nextCode = value.charCodeAt(pos + 1);
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| 71 | nextNextCode = value.charCodeAt(pos + 2);
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| 72 | if ((code === exp || code === EXP) && (nextCode >= 48 && nextCode <= 57 || (nextCode === plus || nextCode === minus) && nextNextCode >= 48 && nextNextCode <= 57)) {
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| 73 | pos += nextCode === plus || nextCode === minus ? 3 : 2;
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| 74 | while(pos < length){
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| 75 | code = value.charCodeAt(pos);
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| 76 | if (code < 48 || code > 57) {
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| 77 | break;
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| 78 | }
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| 79 | pos += 1;
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| 80 | }
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| 81 | }
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| 82 | return {
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| 83 | number: value.slice(0, pos),
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| 84 | unit: value.slice(pos)
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| 85 | };
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| 86 | };
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