nondestructive 0.0.28

Nondestructive editing over various file formats.
Documentation 
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use alloc::string::ToString;

use anyhow::{Context, Result};

use crate::yaml;

#[test]
fn mapping() -> Result<()> {
    let doc = yaml::from_slice(
        r"
        one: 1
        two: 2
        three:
          four: 4
          five: 5
        ",
    )?;

    assert_eq!(
        doc.to_string(),
        r"
        one: 1
        two: 2
        three:
          four: 4
          five: 5
        ",
    );

    Ok(())
}

#[test]
fn inline_mapping() -> Result<()> {
    let doc = yaml::from_slice(
        r"
        one: 1
        two: 2
        three:
          four: {inner: 10, inner2: 20}
          five: 5
        ",
    )?;

    assert_eq!(
        doc.to_string(),
        r"
        one: 1
        two: 2
        three:
          four: {inner: 10, inner2: 20}
          five: 5
        ",
    );

    Ok(())
}

#[test]
fn inline_mapping_only() -> Result<()> {
    let doc = yaml::from_slice(
        r"
        {one: one, two: two, three: 3,}
        ",
    )?;

    let root = doc.as_ref().as_mapping().context("missing root mapping")?;
    assert_eq!(root.get("one").and_then(|v| v.as_str()), Some("one"));
    assert_eq!(root.get("two").and_then(|v| v.as_str()), Some("two"));
    assert_eq!(root.get("three").and_then(|v| v.as_u32()), Some(3));

    assert_eq!(
        doc.to_string(),
        r"
        {one: one, two: two, three: 3,}
        ",
    );

    Ok(())
}

#[test]
fn make_preserve_whitespace() -> Result<()> {
    let mut doc = yaml::from_slice(
        r"
        string
        ",
    )?;

    let mut mapping = doc.as_mut().make_mapping();
    mapping.insert_u32("first", 1);
    mapping.insert_u32("second", 2);

    assert_eq!(
        doc.to_string(),
        r"
        first: 1
        second: 2
        "
    );

    Ok(())
}

#[test]
fn edit_element() -> Result<()> {
    let mut doc = yaml::from_slice("a:\nb:\nc:")?;

    let mapping = doc.as_ref().as_mapping().context("Missing root mapping")?;

    assert_eq!(mapping.len(), 3);

    let a = mapping.get("a").context("Missing a")?;

    let id = a.id();

    let _ = doc.value_mut(id).make_mapping();

    assert_eq!(doc.to_string(), "a:\nb:\nc:");

    let mut mapping = doc
        .value_mut(id)
        .into_mapping_mut()
        .context("Missing mapping")?;

    let mut sequence = mapping
        .insert("inner", yaml::Separator::Auto)
        .make_sequence();

    sequence.push_string("value");

    assert_eq!(doc.to_string(), "a:\n  inner:\n    - value\nb:\nc:");
    Ok(())
}