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Sander Hautvast 2018-05-17 16:03:44 +02:00
commit 373c245f04
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4
Cargo.lock generated Normal file
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[[package]]
name = "ExpressionParser"
version = "0.1.0"

6
Cargo.toml Normal file
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[package]
name = "ExpressionParser"
version = "0.1.0"
authors = ["Sander Hautvast <shautvast@ilionx.com>"]
[dependencies]

15
expression_parser.iml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<module type="RUST_MODULE" version="4">
<component name="NewModuleRootManager" inherit-compiler-output="true">
<exclude-output />
<content url="file://$MODULE_DIR$">
<sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
<sourceFolder url="file://$MODULE_DIR$/examples" isTestSource="false" />
<sourceFolder url="file://$MODULE_DIR$/tests" isTestSource="true" />
<sourceFolder url="file://$MODULE_DIR$/benches" isTestSource="true" />
<excludeFolder url="file://$MODULE_DIR$/target" />
</content>
<orderEntry type="inheritedJdk" />
<orderEntry type="sourceFolder" forTests="false" />
</component>
</module>

113
src/main.rs Normal file
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use std::iter::Peekable;
use std::str::Chars;
fn main() {
println!("{:?}", parse("1+2*62+sin(90)" ));
}
pub fn parse(exp: &str) -> f64 {
let mut parser = Parser {
expr: &mut exp.chars().peekable(),
};
parser.parse()
}
struct Parser<'a> {
expr: &'a mut Peekable<Chars<'a>>,
}
impl<'a> Parser<'a> {
fn parse(&mut self) -> f64 {
self.parse_expression()
}
fn next_char(&mut self) {
self.expr.next();
}
fn eat(&mut self, char_to_eat: char) -> bool {
while self.peek() == ' ' {
self.next_char();
}
if self.peek() == char_to_eat {
self.next_char();
return true;
}
false
}
fn peek(&mut self) -> char{
match self.expr.peek() {
Some(e) => { *e }
None => '\u{0}'
}
}
fn parse_expression(&mut self) -> f64 {
let mut x = self.parse_term();
loop {
if self.eat('+') {
x += self.parse_term();
} else if self.eat('-') {
x -= self.parse_term();
} else { return x; }
}
}
fn parse_term(&mut self) -> f64 {
let mut x = self.parse_factor();
loop {
if self.eat('*') {
x *= self.parse_factor();
} else if self.eat('/') {
x /= self.parse_factor();
} else { return x; }
}
}
fn parse_factor(&mut self) -> f64 {
if self.eat('+') {
return self.parse_factor(); // unary plus
}
if self.eat('-') {
return -self.parse_factor(); // unary minus
}
let mut x: f64;
if self.eat('(') { // parentheses
x = self.parse_expression();
self.eat(')');
} else if self.peek().is_numeric() || self.peek() == '.' { // numbers
let mut buffer = String::new();
while self.peek().is_numeric() || self.peek() == '.' {
buffer.push(self.peek());
self.next_char();
}
x = buffer.parse().unwrap();
} else if self.peek().is_alphabetic() { // functions
let mut func = String::new();
while self.peek().is_alphabetic() {
func.push(self.peek());
self.next_char();
}
x = self.parse_factor();
x = match func.as_str(){
"sqrt" => x.sqrt(),
"sin" => x.to_radians().sin(),
"cos" => x.to_radians().cos(),
"tan" => x.to_radians().tan(),
_ => panic!(format!("Unknown function: {}", func))
};
} else {
panic!(format!("Unexpected: {}", self.peek()));
}
if self.eat('^') {
x = x.powf(self.parse_factor()); // exponentiation
}
x
}
}