swrs 0.1.1

A simple rust library that reads and parses a sketchware project
Documentation 
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use serde::{Deserialize, Serialize};
use super::Parsable;
use thiserror::Error;

#[derive(Debug, Clone, Eq, PartialEq)]
pub struct Resource {
    pub images: Vec<ResourceItem>,
    pub sounds: Vec<ResourceItem>,
    pub fonts: Vec<ResourceItem>,
}

#[derive(Debug, Clone, Copy, Eq, PartialEq)]
pub enum ResourceSection {
    Images,
    Sounds,
    Fonts,
    None,
}

impl Parsable for Resource {
    type ParseError = ResourceParseError;
    type ReconstructionError = ResourceReconstructionError;

    fn parse(decrypted_content: &str) -> Result<Self, Self::ParseError> {
        let mut iterator = decrypted_content.split("\n");

        let mut cur_section = ResourceSection::None;
        let mut result = Resource { images: vec![], sounds: vec![], fonts: vec![] };
        let mut line_count = 0u32;

        loop {
            let line = iterator.next();
            if line.is_none() { break; }
            let line = line.unwrap();

            if line == "@images" {
                cur_section = ResourceSection::Images;
            } else if line == "@sounds" {
                cur_section = ResourceSection::Sounds;
            } else if line == "@fonts" {
                cur_section = ResourceSection::Fonts

            } else if cur_section != ResourceSection::None {
                // parse the resource item if the line isn't empty
                if line.is_empty() { break; }

                let resource_item = ResourceItem::parse(line)
                    .map_err(|err| ResourceParseError::ResourceItemParseError {
                        source: err,
                        section: cur_section,
                        line: line_count
                    })?;

                // push the resource item to the appropriate section
                if cur_section == ResourceSection::Images {
                    &mut result.images
                } else if cur_section == ResourceSection::Sounds {
                    &mut result.sounds
                } else if cur_section == ResourceSection::Fonts {
                    &mut result.fonts
                } else { break }
                    .push(resource_item)
            }

            line_count += 1;
        }

        Ok(result)
    }

    fn reconstruct(&self) -> Result<String, Self::ReconstructionError> {
        Ok(format!(
            "@images\n{}@sounds\n{}@fonts\n{}",
            // a macro might be handy
            self.images
                .iter()
                .try_fold(String::new(), |acc, i|
                    Ok(format!("{}{}\n", acc, i.reconstruct()
                        .map_err(|err| ResourceReconstructionError::ResourceItemReconstructionError {
                            source: err,
                            section: ResourceSection::Images,
                            item: i.to_owned()
                        })?))
                )?,
            self.sounds
                .iter()
                .try_fold(String::new(), |acc, i|
                    Ok(format!("{}{}\n", acc, i.reconstruct()
                        .map_err(|err| ResourceReconstructionError::ResourceItemReconstructionError {
                            source: err,
                            section: ResourceSection::Sounds,
                            item: i.to_owned()
                        })?))
                )?,
            self.fonts
                .iter()
                .try_fold(String::new(), |acc, i|
                    Ok(format!("{}{}\n", acc, i.reconstruct()
                        .map_err(|err| ResourceReconstructionError::ResourceItemReconstructionError {
                            source: err,
                            section: ResourceSection::Fonts,
                            item: i.to_owned()
                        })?))
                )?
                .trim(), // i don't want the extra \n at the end of the file
        ))
    }
}

#[derive(Error, Debug)]
pub enum ResourceParseError {
    #[error("error while parsing a resource item of {section:?} at line {line}")]
    ResourceItemParseError {
        #[source]
        source: serde_json::Error,
        section: ResourceSection,
        line: u32
    }
}

#[derive(Error, Debug)]
pub enum ResourceReconstructionError {
    #[error("error while reconstruction resource item `{item:?}` of section {section:?}")]
    ResourceItemReconstructionError {
        #[source]
        source: serde_json::Error,
        section: ResourceSection,
        item: ResourceItem
    }
}

#[derive(Debug, Clone, Serialize, Deserialize, Eq, PartialEq)]
pub struct ResourceItem {
    /// The filename of the resource
    #[serde(rename = "resFullName")]
    pub full_name: String,

    /// The resource name of this resource
    #[serde(rename = "resName")]
    pub name: String,

    // Unknown usage, this value is always 1
    #[serde(rename = "resType")]
    pub r#type: u8,
}

impl Parsable for ResourceItem {
    type ParseError = serde_json::Error;
    type ReconstructionError = serde_json::Error;

    fn parse(decrypted_content: &str) -> Result<Self, Self::ParseError> {
        serde_json::from_str(decrypted_content)
    }

    fn reconstruct(&self) -> Result<String, Self::ReconstructionError> {
        serde_json::to_string(self)
    }
}