vertigo 0.1.1

Reactive Real-DOM library for Rust
Documentation 
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use std::collections::HashMap;

pub struct JsonMapBuilder {
    data: HashMap<String, String>,
}

//Escape and Unicode encoding in JSON serialization
//https://developpaper.com/escape-and-unicode-encoding-in-json-serialization/

fn string_escape(text: &str) -> String {
    let new_capacity = 2 * text.len() + 2;
    let mut out: Vec<char> = Vec::with_capacity(new_capacity);

    for char in text.chars() {
        match char {
            '"' => {
                out.push('\\');
                out.push('"');
            }
            // / - ignore
            '\\' => {
                out.push('\\');
                out.push('\\');
            }
            // \b - ignore
            // \f - ignore
            '\t' => {
                out.push('\\');
                out.push('t');
            }
            '\r' => {
                out.push('\\');
                out.push('r');
            }
            '\n' => {
                out.push('\\');
                out.push('n');
            }
            // < - ignore
            // > - ignore
            // & - ignore
            _ => {
                out.push(char);
            }
        }
    }

    out.into_iter().collect()
}

impl JsonMapBuilder {
    pub fn new() -> JsonMapBuilder {
        JsonMapBuilder { data: HashMap::new() }
    }

    pub fn set_string(&mut self, key: &str, value: &str) {
        self.data.insert(
            string_escape(key),
            format!("\"{}\"", string_escape(value)),
        );
    }

    pub fn set_u64(&mut self, key: &str, value: u64) {
        self.data.insert(
            string_escape(key),
            value.to_string(),
        );
    }

    pub fn set_null(&mut self, key: &str) {
        self.data.insert(
            string_escape(key),
            "null".into(),
        );
    }

    pub fn build(self) -> String {
        let mut records: Vec<String> = Vec::new();

        for (key, value) in self.data.into_iter() {
            records.push(format!("\"{key}\":{value}"));
        }

        records.sort();

        let content = records.as_slice().join(",");

        format!("{{{content}}}")
    }
}

//JSON Formatter & Validator
//https://jsonformatter.curiousconcept.com/

#[test]
fn basic() {
    let builder = JsonMapBuilder::new();
    let result = builder.build();
    assert_eq!(result, "{}");
}

#[test]
fn basic2() {
    let mut builder = JsonMapBuilder::new();
    builder.set_string("Content-Type", "application/json");
    let result = builder.build();
    assert_eq!(result, "{\"Content-Type\":\"application/json\"}");
}

#[test]
fn basic3() {
    let mut builder = JsonMapBuilder::new();
    builder.set_string("Content-Type", "application/json");
    builder.set_string("token", "3333");
    let result = builder.build();
    assert_eq!(result, "{\"Content-Type\":\"application/json\",\"token\":\"3333\"}");
}

#[test]
fn basic4() {
    let mut builder = JsonMapBuilder::new();
    builder.set_string("token", "33\"33");
    let result = builder.build();
    assert_eq!(result, "{\"token\":\"33\\\"33\"}");
}

#[test]
fn basic5() {
    let mut builder = JsonMapBuilder::new();
    builder.set_u64("token", 4);
    let result = builder.build();
    assert_eq!(result, "{\"token\":4}");
}

#[test]
fn basic6() {
    let mut builder = JsonMapBuilder::new();
    builder.set_null("token");
    let result = builder.build();
    assert_eq!(result, "{\"token\":null}");
}

#[test]
fn basic7() {
    let mut builder = JsonMapBuilder::new();
    builder.set_string("css", r#"color: crimson;
text-decoration: line-through;"#);
    let result = builder.build();
    assert_eq!(result, "{\"css\":\"color: crimson;\\ntext-decoration: line-through;\"}");
}

#[test]
fn basic_tab() {
    let text = "https://example.com/\t";

    let mut builder = JsonMapBuilder::new();
    builder.set_string("value", text);

    let result = builder.build();
    assert_eq!(result, "{\"value\":\"https://example.com/\\t\"}");
}

#[test]
fn basic_slash() {
    let text = "aa\\bb";

    let mut builder = JsonMapBuilder::new();
    builder.set_string("value", text);

    let result = builder.build();
    assert_eq!(result, "{\"value\":\"aa\\\\bb\"}");
}