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Add iterator/closure updated version of minigrep example

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This commit is contained in:
Timothy Warren 2019-02-01 16:33:01 -05:00
parent d4835dc6b8
commit b10c01f40c
6 changed files with 198 additions and 22 deletions
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1
.idea/misc.xml
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@ -22,6 +22,7 @@
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<cargoProject FILE="$PROJECT_DIR$/minigrep/Cargo.toml" />
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5
.idea/rust.iml
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@ -86,6 +86,10 @@
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@ -99,6 +103,7 @@
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<excludeFolder url="file://$MODULE_DIR$/minigrep/target" />
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91
.idea/workspace.xml
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@ -2,6 +2,8 @@
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@ -234,13 +257,13 @@
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@ -263,11 +286,11 @@
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@ -296,13 +319,16 @@
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7
minigrep_v2/Cargo.toml Normal file
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@ -0,0 +1,7 @@
[package]
name = "minigrep_v2"
version = "0.1.0"
authors = ["Timothy Warren <twarren@nabancard.com>"]
edition = "2018"
[dependencies]

99
minigrep_v2/src/lib.rs Normal file
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@ -0,0 +1,99 @@
use std::env;
use std::error::Error;
use std::fs;
pub struct Config {
pub query: String,
pub filename: String,
pub case_sensitive: bool,
}
impl Config {
pub fn new(mut args: std::env::Args) -> Result<Config, &'static str> {
args.next(); // Skip the program's name
let query = match args.next() {
Some(arg) => arg,
None => return Err("Didn't get a query string"),
};
let filename = match args.next() {
Some(arg) => arg,
None => return Err("Didn't get a file name"),
};
let case_sensitive = env::var("CASE_INSENSITIVE").is_err();
Ok(Config { query, filename, case_sensitive })
}
}
pub fn run(config: Config) -> Result<(), Box<dyn Error>> {
// The ? operator passes the error back to the caller.
let contents = fs::read_to_string(config.filename)?;
let results = if config.case_sensitive {
search(&config.query, &contents)
} else {
search_case_insensitive(&config.query, &contents)
};
for line in results {
println!("{}", line);
}
Ok(())
}
fn search<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
contents.lines()
.filter(|line| line.contains(query))
.collect()
}
fn search_case_insensitive<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
let query = query.to_lowercase();
contents.lines()
.filter(|line| {
line.to_lowercase()
.as_str()
.contains(query.as_str())
})
.collect()
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn case_sensitive() {
let query = "duct";
let contents = "\
Rust:
safe, fast, productive.
Pick three.
Duct tape.";
assert_eq!(
vec!["safe, fast, productive."],
search(query, contents)
);
}
#[test]
fn case_insensitive() {
let query = "rUsT";
let contents = "\
Rust:
safe, fast, productive.
Pick three.
Trust me.";
assert_eq!(
vec!["Rust:", "Trust me."],
search_case_insensitive(query, contents)
);
}
}

17
minigrep_v2/src/main.rs Normal file
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@ -0,0 +1,17 @@
use std::env;
use std::process;
use minigrep_v2;
use minigrep_v2::Config;
fn main() {
let config = Config::new(env::args()).unwrap_or_else(|err| {
eprintln!("Problem parsing arguments: {}", err);
process::exit(1);
});
if let Err(e) = minigrep_v2::run(config) {
eprintln!("Application error: {}", e);
process::exit(1);
}
}