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use crate::complex::Complex;
use crate::context::Context;
use crate::function::FunctionArgument;
use crate::string::{ContainsAndSkipBrackets, SplitMatchingBracket};
pub struct Expression {
repr: String,
}
impl Expression {
pub fn from_string(str: &str) -> Self {
Self {
repr: str.replace(' ', ""),
}
}
pub fn evaluate(&self, context: &Context) -> Result<Complex, String> {
let (repr, oprepr) = {
if self.repr.starts_with('(') {
let (oprepr, r) = self.repr.split_on_matching_bracket();
if r.is_empty() {
let repr = oprepr[1..oprepr.len() - 1].to_string();
(repr.clone(), repr)
} else {
(self.repr.to_string(), r.to_string())
}
} else {
(self.repr.to_string(), self.repr.to_string())
}
};
let curop: Option<_> = {
let mut o = None;
for op in context.operations() {
if oprepr.contains_and_skip_brackets(op.sign().to_string().as_str()) {
o = Some(op);
break;
}
}
o
};
if let Some(op) = curop {
let (first, rest) = repr.split_once_and_skipt_brackets(op.sign()).unwrap();
let first_expr = Expression::from_string(first);
let rest_expr = Expression::from_string(rest);
Ok(op.evaluate(first_expr.evaluate(context)?, rest_expr.evaluate(context)?))
} else if let Ok(r) = repr.parse::<Complex>() {
Ok(r)
} else if let Some((func, args)) = repr.split_once('(') {
let mut argv = Vec::new();
for arg in args[..args.len() - 1].split(',') {
argv.push(Expression::from_string(arg).evaluate(context)?);
}
if let Some(func) = context.function(func) {
Ok(func.eval(FunctionArgument::new(argv), context)?)
} else {
Err(format!("function '{func}' not found"))
}
} else if let Some(res) = context.variable(&repr) {
Ok(*res)
} else {
Err(format!("variable '{repr}' not found"))
}
}
}
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