added fix helper
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2 changed files with 17 additions and 0 deletions
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@ -7,6 +7,22 @@ use evalexpr::{
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use crate::util;
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// Mathematics
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pub fn fix(arg: &Value) -> Result<Value, EvalexprError> {
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let args = arg.as_tuple()?;
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let count = args.len();
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if count != 2 {
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return Err(EvalexprError::WrongFunctionArgumentAmount { expected: 2, actual: count });
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}
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let float = args[0].as_float()?;
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let figures = args[1].as_int()?;
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let operand: f64 = i64::pow(10, figures as u32) as f64;
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let output = f64::round(float * operand) / operand;
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return Ok(output.into());
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}
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pub fn logarithm(arg: &Value) -> Result<Value, EvalexprError> {
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let arguments: Vec<Value>;
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let count: usize;
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@ -36,6 +36,7 @@ fn main() {
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"√2" => global::ROOT_TWO,
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// math functions
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"fix" => Function::new(|arg| helper::fix(arg)),
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"log" => Function::new(|arg| helper::logarithm(arg)),
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"sqrt" => Function::new(|arg| helper::square_root(arg)),
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