libgm 0.5.1

A tool for modding, unpacking and decompiling GameMaker games
Documentation 
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use macros::named_list_chunk;

use crate::gml::GMCode;
use crate::prelude::*;
use crate::wad::deserialize::reader::DataReader;
use crate::wad::deserialize::resources::resource_opt_from_i32;
use crate::wad::elements::GMElement;
use crate::wad::reference::GMRef;
use crate::wad::serialize::builder::DataBuilder;

#[named_list_chunk("SCPT")]
pub struct GMScripts {
    pub scripts: Vec<GMScript>,
    pub exists: bool,
}

impl GMElement for GMScripts {
    fn deserialize(reader: &mut DataReader) -> Result<Self> {
        let scripts: Vec<GMScript> = reader.read_pointer_list()?;
        Ok(Self { scripts, exists: true })
    }

    fn serialize(&self, builder: &mut DataBuilder) -> Result<()> {
        builder.write_pointer_list(&self.scripts)?;
        Ok(())
    }
}

impl GMScripts {
    /// Gets a `GMRef<GMCode>` based on the name of a [`GMScript`].
    pub fn code_ref_by_name(&self, script_name: &str) -> Result<GMRef<GMCode>> {
        let script: &GMScript = self.by_name(script_name)?;
        let code_ref: GMRef<GMCode> = script.code.ok_or_else(|| {
            format!("Script {script_name:?} does not have an associated code entry")
        })?;
        Ok(code_ref)
    }

    /// Gets a `&GMCode` based on the name of a [`GMScript`].
    pub fn code_by_name<'a>(&self, script_name: &str, gm_data: &'a GMData) -> Result<&'a GMCode> {
        let code_ref: GMRef<GMCode> = self.code_ref_by_name(script_name)?;
        gm_data.codes.by_ref(code_ref)
    }
}

#[derive(Debug, Clone, PartialEq)]
pub struct GMScript {
    pub name: String,
    pub is_constructor: bool,
    pub code: Option<GMRef<GMCode>>,
}

impl GMElement for GMScript {
    fn deserialize(reader: &mut DataReader) -> Result<Self> {
        let name: String = reader.read_gm_string()?;
        let mut code_id: i32 = reader.read_i32()?;
        let mut is_constructor: bool = false;
        if code_id < -1 {
            code_id &= 0x7FFF_FFFF;
            is_constructor = true;
        }
        let code: Option<GMRef<GMCode>> = resource_opt_from_i32(code_id)?;
        Ok(Self { name, is_constructor, code })
    }

    fn serialize(&self, builder: &mut DataBuilder) -> Result<()> {
        builder.write_gm_string(&self.name);
        if self.is_constructor {
            if let Some(gm_code_ref) = &self.code {
                builder.write_u32(gm_code_ref.index | 0x8000_0000);
            } else {
                builder.write_i32(-1);
            }
        } else {
            builder.write_resource_id_opt(self.code);
        }
        Ok(())
    }
}