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Calculator Peg JS
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| start | |
| = any | |
| any | |
| = multiplicative | |
| / divisive | |
| / power | |
| / additive | |
| / subtractive | |
| / primary | |
| primary | |
| = fraction | |
| / abs | |
| / float | |
| / integer | |
| / "(" any:any ")" { return any; } | |
| / "" { return 0; } | |
| additive | |
| = left:primary "+" right:any { return left + right; } | |
| multiplicative | |
| = left:primary "*" right:any { return left * right; } | |
| subtractive | |
| = left:primary "-" right:any { return left - right; } | |
| divisive | |
| = left:primary "/" right:any { return left / right; } | |
| power | |
| = left:primary "^" right:any { return Math.pow(left, right); } | |
| fraction | |
| = "\\fraction{" nominator:any "}{" denominator:any "}" | |
| { | |
| if (denominator === 0) { | |
| if (nominator < 0) { | |
| return Number.POSITIVE_INFINITY; | |
| } else { | |
| return Number.NEGATIVE_INFINITY; | |
| } | |
| } else { | |
| return nominator / denominator; | |
| } | |
| } | |
| abs | |
| = "\\abs{" argument:any "}" | |
| { | |
| return Math.abs(argument); | |
| } | |
| float "float" | |
| = left:[0-9]+ "." right:[0-9]+ { return parseFloat(left.join("") + "." + right.join("")); } | |
| integer "integer" | |
| = digits:[0-9]+ { return parseInt(digits.join(""), 10); } |
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| (2*3)+4+8 | |
| 3*(12-6) | |
| \frac{1}{2}*\abs{-10} |
what about 1+2/3?
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This grammar also accept string like following "1+", it's not very good.