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reading expressions

This commit is contained in:
Christoph J. Scherr 2023-02-11 16:07:28 +01:00
parent 96277e3c04
commit 5c950a1f40
4 changed files with 236 additions and 6 deletions
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118
Cargo.lock generated
View File

@ -2,12 +2,27 @@
# It is not intended for manual editing.
version = 3
[[package]]
name = "aho-corasick"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
"memchr",
]
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@ -124,6 +139,88 @@ version = "0.1.4"
source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"num-complex",
"num-integer",
"num-iter",
"num-rational",
"num-traits",
]
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"num-traits",
]
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"num-traits",
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@ -178,12 +275,31 @@ dependencies = [
"proc-macro2",
]
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[[package]]
name = "rust_command_line_calculator"
version = "0.1.0"
version = "0.1.1"
dependencies = [
"anyhow",
"clap",
"num",
"regex",
]
[[package]]

2
Cargo.toml
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@ -18,3 +18,5 @@ path = "src/main.rs"
[dependencies]
clap = { version = "4.0", features = ["derive"] }
anyhow = "1.0"
num = "0.4.0"
regex = "1.7.1"

98
src/expression_parser.rs
View File

@ -1,2 +1,100 @@
use std::fmt;
use regex::Regex;
// In an expression like `sqrt(25)` the Task would correspond to `sqrt`. This is the enum to
// configure possible Tasks.
// None means, the Expression doesn't send it's Value to a Task Handler
#[derive(Debug)] // automatically generate Debug Formatter
enum Task {
None,
Sqrt,
Power,
Log,
}
// How to clone a Task, i was supprised I had to do it myself.
impl Clone for Task {
fn clone(&self) -> Self {
// This can probably be done cleaner than with a verbose match. FIXME
match self {
Task::None => Task::None,
Task::Sqrt => Task::Sqrt,
Task::Power => Task::Power,
Task::Log => Task::Log,
}
}
}
// An Expression is something that can be calculated. 20+5 is an expression. Expressions can
// contain other
// Expressions and have tasks: 20+sqrt(20+5)
// Expressions are marked down with braces and a task before those braces:
// task(Expression)
// once the Value of the Expression got calculated, the calculated value should be sent to the
// TaskHandler, if the Task of the Expression is not Task::None
pub struct Expression {
text: String,
task: Task,
complex: bool,
inner_value: f64,
outer_value: f64,
children: Vec<Expression>,
}
// Debug Formatter for Expression
impl fmt::Debug for Expression {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("Expression")
.field("text", &self.text)
.field("task", &self.task)
.field("is complex?", &self.complex)
.field("inner value", &self.inner_value)
.field("outer value", &self.outer_value)
.field("children", &self.children)
.finish()
}
}
// implement clone by ourselves, as it's not automatically done for us.
impl Clone for Expression{
fn clone(&self) -> Self {
Expression {
text: self.text.clone(),
task: self.task.clone(),
complex: self.complex.clone(), // TODO add support for complex numbers
inner_value: self.inner_value.clone(),
outer_value: self.outer_value.clone(),
children: self.children.clone(),
}
}
}
/*
* Main logic for the Expression struct
*/
impl Expression {
/*
* Main function for making text into Expression
*/
pub fn new(expression_text: String) -> Expression {
// find children
let re_sub_expression = Regex::new(r"\w+\(.+\)").unwrap();
if re_sub_expression.is_match(&expression_text) {
for sub_expression_text in re_sub_expression.captures_iter(&expression_text) {
println!("{}", &sub_expression_text[0]);
}
}
let expression = Expression {
text: expression_text,
// TODO generate these from the text!
task: Task::None,
complex: false,
inner_value: 0.0,
outer_value: 0.0,
children: Vec::new(),
};
expression
}
}

24
src/main.rs
View File

@ -1,7 +1,10 @@
use clap::{Parser, Subcommand};
mod expression_parser;
mod linear_algebra;
use clap::{Parser, Subcommand};
use expression_parser::Expression;
#[derive(Parser)]
#[command(author, version, about, long_about = None)]
@ -18,19 +21,30 @@ struct Arg {
command: Option<Commands>,
/// An expression that should be used to calculate something
expressionVector: Vec<String>,
expression_texts: Vec<String>,
}
#[derive(Subcommand)]
enum Commands {
/// Assert if two expressions are equal to each other
Equal {
expressionVector: Vec<String>,
}
}
fn main() {
let args = Arg::parse();
dbg!(args.expressionVector);
}
let mut expression_vec: Vec<Expression> = Vec::new();
// join expression_texts to a big expression text, split at '%'. Remove unnessecary whitespace
// at the start ot end.
// TODO implement splitting of expressions, currently they are made only into a single big
// expression text
let mut expression_texts_concat: Vec<String> = Vec::new();
expression_texts_concat.push(args.expression_texts.join(" ").trim().to_string());
for expression_text in expression_texts_concat {
expression_vec.push(Expression::new(expression_text));
}
dbg!(expression_vec);
}