#!/usr/bin/env rust
use std::collections::HashMap;
use std::fs;
use std::process;

fn main() {
    // Read the file located at /tmp/file.txt
    let contents = match fs::read_to_string("/tmp/file.txt") {
        Ok(data) => data,
        Err(err) => {
            eprintln!("Error reading /tmp/file.txt: {}", err);
            process::exit(1);
        }
    };

    // We'll split the file into words using whitespace.
    // We'll also preserve the order in which each word first appears.
    let mut counts: HashMap<&str, usize> = HashMap::new();
    let mut order: Vec<&str> = Vec::new();

    for word in contents.split_whitespace() {
        if !counts.contains_key(word) {
            order.push(word);
        }
        *counts.entry(word).or_insert(0) += 1;
    }

    // Manually build a JSON object string.
    // Note: This simple approach does not escape any characters.
    let mut json_output = String::from("{");
    let mut first = true;
    for word in order {
        if !first {
            json_output.push_str(", ");
        } else {
            first = false;
        }
        // Append each key-value pair in "key": value format.
        // We assume that the words do not contain quotes or other characters needing escaping.
        json_output.push_str(&format!("\"{}\": {}", word, counts[word]));
    }
    json_output.push('}');

    // Print the JSON output to stdout.
    println!("{}", json_output);
}

#!/usr/bin/env rust
use std::collections::HashMap;
use std::fs;
use std::process;

fn main() {
    // Read the file located at /tmp/file.txt
    let contents = match fs::read_to_string("/tmp/file.txt") {
        Ok(data) => data,
        Err(err) => {
            eprintln!("Error reading /tmp/file.txt: {}", err);
            process::exit(1);
        }
    };

    // We'll split the file into words using whitespace.
    // We'll also preserve the order in which each word first appears.
    let mut counts: HashMap<&str, usize> = HashMap::new();
    let mut order: Vec<&str> = Vec::new();

    for word in contents.split_whitespace() {
        if !counts.contains_key(word) {
            order.push(word);
        }
        *counts.entry(word).or_insert(0) += 1;
    }

    // Manually build a JSON object string.
    // Note: This simple approach does not escape any characters.
    let mut json_output = String::from("{");
    let mut first = true;
    for word in order {
        if !first {
            json_output.push_str(", ");
        } else {
            first = false;
        }
        // Append each key-value pair in "key": value format.
        // We assume that the words do not contain quotes or other characters needing escaping.
        json_output.push_str(&format!("\"{}\": {}", word, counts[word]));
    }
    json_output.push('}');

    // Print the JSON output to stdout.
    println!("{}", json_output);
}

{"it": 10, "was": 10, "the": 11, "best": 1, "of": 10, "times,": 2, "worst": 1, "age": 2, "wisdom,": 1, "foolishness,": 1, "epoch": 2, "belief,": 1, "incredulity,": 1, "season": 2, "Light,": 1, "Darkness,": 1, "spring": 1, "hope,": 1, "winter": 1, "despair,": 1, "we": 4, "had": 2, "everything": 1, "before": 2, "us,": 2, "nothing": 1, "were": 2, "all": 2, "going": 2, "direct": 2, "to": 1, "Heaven,": 1, "other": 1, "way": 1}

#!/usr/bin/env rust
use std::collections::HashMap;
use std::fs;
use std::io::{self, Write};

fn escape_json_string(s: &str) -> String {
    let mut escaped = String::with_capacity(s.len());
    for c in s.chars() {
        match c {
            '\"' => escaped.push_str("\\\""),
            '\\' => escaped.push_str("\\\\"),
            '\n' => escaped.push_str("\\n"),
            '\r' => escaped.push_str("\\r"),
            '\t' => escaped.push_str("\\t"),
            c if c.is_control() => {
                // if character is other control character, use unicode escape
                escaped.push_str(&format!("\\u{:04x}", c as u32));
            }
            _ => escaped.push(c),
        }
    }
    escaped
}

fn main() {
    // Attempt to read the entire file into a string
    let file_contents = fs::read_to_string("/tmp/file.txt").unwrap_or_else(|err| {
        eprintln!("Error reading file: {}", err);
        std::process::exit(1);
    });

    let mut counts: HashMap<String, u32> = HashMap::new();
    // We'll also track the order of first appearance of words,
    // so that JSON keys order in output reflects order in file.
    let mut order: Vec<String> = Vec::new();

    // Split the file into tokens on whitespace.
    // Tokens are taken literally, punctuation included.
    for word in file_contents.split_whitespace() {
        // If word is encountered for first time, remember its order.
        if !counts.contains_key(word) {
            order.push(word.to_string());
        }
        *counts.entry(word.to_string()).or_insert(0) += 1;
    }

    // Print JSON representation:
    // We want output like: {"This": 1, "is": 2, "is,": 1, "an": 1, "example": 1}
    let stdout = io::stdout();
    let mut handle = stdout.lock();
    write!(handle, "{{").unwrap();

    let mut first = true;
    for key in order {
        if let Some(&val) = counts.get(&key) {
            if !first {
                write!(handle, ", ").unwrap();
            }
            first = false;
            let escaped_key = escape_json_string(&key);
            write!(handle, "\"{}\": {}", escaped_key, val).unwrap();
        }
    }
    writeln!(handle, "}}").unwrap();
}

/*

To compile:
    rustc yourfile.rs

Then run without arguments:
    ./yourfile

This program reads /tmp/file.txt, counts how often each whitespace‐separated word appears and prints a JSON object to stdout.
*/

#!/usr/bin/env rust
use std::collections::HashMap;
use std::fs;
use std::io::{self, Write};

fn escape_json_string(s: &str) -> String {
    let mut escaped = String::with_capacity(s.len());
    for c in s.chars() {
        match c {
            '\"' => escaped.push_str("\\\""),
            '\\' => escaped.push_str("\\\\"),
            '\n' => escaped.push_str("\\n"),
            '\r' => escaped.push_str("\\r"),
            '\t' => escaped.push_str("\\t"),
            c if c.is_control() => {
                // if character is other control character, use unicode escape
                escaped.push_str(&format!("\\u{:04x}", c as u32));
            }
            _ => escaped.push(c),
        }
    }
    escaped
}

fn main() {
    // Attempt to read the entire file into a string
    let file_contents = fs::read_to_string("/tmp/file.txt").unwrap_or_else(|err| {
        eprintln!("Error reading file: {}", err);
        std::process::exit(1);
    });

    let mut counts: HashMap<String, u32> = HashMap::new();
    // We'll also track the order of first appearance of words,
    // so that JSON keys order in output reflects order in file.
    let mut order: Vec<String> = Vec::new();

    // Split the file into tokens on whitespace.
    // Tokens are taken literally, punctuation included.
    for word in file_contents.split_whitespace() {
        // If word is encountered for first time, remember its order.
        if !counts.contains_key(word) {
            order.push(word.to_string());
        }
        *counts.entry(word.to_string()).or_insert(0) += 1;
    }

    // Print JSON representation:
    // We want output like: {"This": 1, "is": 2, "is,": 1, "an": 1, "example": 1}
    let stdout = io::stdout();
    let mut handle = stdout.lock();
    write!(handle, "{{").unwrap();

    let mut first = true;
    for key in order {
        if let Some(&val) = counts.get(&key) {
            if !first {
                write!(handle, ", ").unwrap();
            }
            first = false;
            let escaped_key = escape_json_string(&key);
            write!(handle, "\"{}\": {}", escaped_key, val).unwrap();
        }
    }
    writeln!(handle, "}}").unwrap();
}

/*

To compile:
    rustc yourfile.rs

Then run without arguments:
    ./yourfile

This program reads /tmp/file.txt, counts how often each whitespace‐separated word appears and prints a JSON object to stdout.
*/

{"it": 10, "was": 10, "the": 11, "best": 1, "of": 10, "times,": 2, "worst": 1, "age": 2, "wisdom,": 1, "foolishness,": 1, "epoch": 2, "belief,": 1, "incredulity,": 1, "season": 2, "Light,": 1, "Darkness,": 1, "spring": 1, "hope,": 1, "winter": 1, "despair,": 1, "we": 4, "had": 2, "everything": 1, "before": 2, "us,": 2, "nothing": 1, "were": 2, "all": 2, "going": 2, "direct": 2, "to": 1, "Heaven,": 1, "other": 1, "way": 1}