78 lines
2.2 KiB
Plaintext
78 lines
2.2 KiB
Plaintext
/* Arithmetic evaluation, in Jsish */
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function evalArithmeticExp(s) {
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s = s.replace(/\s/g,'').replace(/^\+/,'');
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var rePara = /\([^\(\)]*\)/;
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var exp;
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function evalExp(s) {
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s = s.replace(/[\(\)]/g,'');
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var reMD = /[0-9]+\.?[0-9]*\s*[\*\/]\s*[+-]?[0-9]+\.?[0-9]*/;
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var reM = /\*/;
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var reAS = /-?[0-9]+\.?[0-9]*\s*[\+-]\s*[+-]?[0-9]+\.?[0-9]*/;
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var reA = /[0-9]\+/;
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var exp;
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function multiply(s, b=0) {
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b = s.split('*');
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return b[0] * b[1];
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}
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function divide(s, b=0) {
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b = s.split('/');
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return b[0] / b[1];
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}
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function add(s, b=0) {
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s = s.replace(/^\+/,'').replace(/\++/,'+');
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b = s.split('+');
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return Number(b[0]) + Number(b[1]);
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}
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function subtract(s, b=0) {
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s = s.replace(/\+-|-\+/g,'-');
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if (s.match(/--/)) {
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return add(s.replace(/--/,'+'));
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}
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b = s.split('-');
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return b.length == 3 ? -1 * b[1] - b[2] : b[0] - b[1];
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}
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while (exp = s.match(reMD)) {
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s = exp[0].match(reM) ? s.replace(exp[0], multiply(exp[0]).toString()) : s.replace(exp[0], divide(exp[0]).toString());
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}
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while (exp = s.match(reAS)) {
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s = exp[0].match(reA)? s.replace(exp[0], add(exp[0]).toString()) : s.replace(exp[0], subtract(exp[0]).toString());
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}
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return '' + s;
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}
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while (exp = s.match(rePara)) {
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s = s.replace(exp[0], evalExp(exp[0]));
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}
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return evalExp(s);
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}
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if (Interp.conf('unitTest')) {
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; evalArithmeticExp('2+3');
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; evalArithmeticExp('2+3/4');
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; evalArithmeticExp('2*3-4');
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; evalArithmeticExp('2*(3+4)+5/6');
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; evalArithmeticExp('2 * (3 + (4 * 5 + (6 * 7) * 8) - 9) * 10');
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; evalArithmeticExp('2*-3--4+-0.25');
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}
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/*
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=!EXPECTSTART!=
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evalArithmeticExp('2+3') ==> 5
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evalArithmeticExp('2+3/4') ==> 2.75
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evalArithmeticExp('2*3-4') ==> 2
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evalArithmeticExp('2*(3+4)+5/6') ==> 14.8333333333333
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evalArithmeticExp('2 * (3 + (4 * 5 + (6 * 7) * 8) - 9) * 10') ==> 7000
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evalArithmeticExp('2*-3--4+-0.25') ==> -2.25
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=!EXPECTEND!=
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*/
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