world: process sign data, prepare for serialization

src/world/block_entity.rs

@@ -0,0 +1,89 @@
+//! Processing of block entity data
+
+use serde::{Deserialize, Serialize};
+
+use super::{
+	de,
+	sign::{BlockEntitySignExt, SignText},
+};
+
+/// Kind of sign block
+#[derive(Debug, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case")]
+pub enum SignKind {
+	/// Standing or attached sign
+	Sign,
+	/// Hanging sign
+	HangingSign,
+}
+
+/// Processed sign data
+#[derive(Debug, Serialize, Deserialize)]
+pub struct Sign {
+	/// The kind of the sign
+	pub kind: SignKind,
+	/// The sign's front text
+	#[serde(skip_serializing_if = "SignText::is_empty", default)]
+	pub front_text: SignText,
+	/// The sign's back text
+	#[serde(skip_serializing_if = "SignText::is_empty", default)]
+	pub back_text: SignText,
+}
+
+impl Sign {
+	/// Processes a [de::BlockEntitySign] into a [Sign]
+	fn new(sign: &de::BlockEntitySign, kind: SignKind) -> Sign {
+		let (front_text, back_text) = sign.text();
+		let front_text = front_text.decode();
+		let back_text = back_text.decode();
+		Sign {
+			kind,
+			front_text,
+			back_text,
+		}
+	}
+}
+
+/// Data for different kinds of [BlockEntity]
+#[derive(Debug, Serialize, Deserialize)]
+#[serde(tag = "type", rename_all = "snake_case")]
+pub enum BlockEntityData {
+	/// A sign block
+	Sign(Sign),
+}
+
+/// A processed block entity
+#[derive(Debug, Serialize, Deserialize)]
+pub struct BlockEntity {
+	/// Global X coordinate
+	pub x: i32,
+	/// Global Y coordinate
+	pub y: i32,
+	/// Global Z coordinate
+	pub z: i32,
+	/// Entity data
+	#[serde(flatten)]
+	pub data: BlockEntityData,
+}
+
+impl BlockEntity {
+	/// Processes a [de::BlockEntity] into a [BlockEntity]
+	pub fn new(entity: &de::BlockEntity) -> Option<Self> {
+		let data = match &entity.data {
+			de::BlockEntityData::Sign(sign) => {
+				BlockEntityData::Sign(Sign::new(sign, SignKind::Sign))
+			}
+			de::BlockEntityData::HangingSign(sign) => {
+				BlockEntityData::Sign(Sign::new(sign, SignKind::HangingSign))
+			}
+			de::BlockEntityData::Other => return None,
+		};
+
+		Some(BlockEntity {
+			x: entity.x,
+			y: entity.y,
+			z: entity.z,
+			data,
+		})
+	}
+}

src/world/chunk.rs

@@ -10,7 +10,7 @@ use std::{
 
 use anyhow::{bail, Context, Result};
 
-use super::{de, section::*};
+use super::{block_entity::BlockEntity, de, section::*};
 use crate::{
 	resource::{BiomeTypes, BlockTypes},
 	types::*,
@@ -55,6 +55,8 @@ pub enum ChunkInner<'a> {
 pub struct Chunk<'a> {
 	/// Version-specific data
 	inner: ChunkInner<'a>,
+	/// Unprocessed block entities
+	block_entities: &'a Vec<de::BlockEntity>,
 }
 
 impl<'a> Chunk<'a> {
@@ -66,17 +68,27 @@ impl<'a> Chunk<'a> {
 	) -> Result<(Self, bool)> {
 		let data_version = data.data_version.unwrap_or_default();
 
-		let (inner, has_unknown) = match &data.chunk {
+		let ((inner, has_unknown), block_entities) = match &data.chunk {
 			de::ChunkVariant::V1_18 {
 				sections,
-				block_entities: _,
-			} => Self::new_v1_18(data_version, sections, block_types, biome_types)?,
-			de::ChunkVariant::V0 { level } => {
-				Self::new_v0(data_version, level, block_types, biome_types)?
-			}
+				block_entities,
+			} => (
+				Self::new_v1_18(data_version, sections, block_types, biome_types)?,
+				block_entities,
+			),
+			de::ChunkVariant::V0 { level } => (
+				Self::new_v0(data_version, level, block_types, biome_types)?,
+				&level.tile_entities,
+			),
 		};
 
-		Ok((Chunk { inner }, has_unknown))
+		Ok((
+			Chunk {
+				inner,
+				block_entities,
+			},
+			has_unknown,
+		))
 	}
 
 	/// [Chunk::new] implementation for Minecraft v1.18+ chunks
@@ -230,6 +242,14 @@ impl<'a> Chunk<'a> {
 			},
 		}
 	}
+
+	/// Processes all of the chunk's block entities
+	pub fn block_entities(&self) -> Vec<BlockEntity> {
+		self.block_entities
+			.iter()
+			.filter_map(BlockEntity::new)
+			.collect()
+	}
 }
 
 /// Reference to block, biome and block light data of a section

src/world/json_text.rs

@@ -2,7 +2,7 @@
 
 use std::{collections::VecDeque, sync::Arc};
 
-use serde::Deserialize;
+use serde::{Deserialize, Serialize};
 
 /// A span of formatted text
 ///
@@ -11,22 +11,28 @@ use serde::Deserialize;
 /// is handled by [DeserializedText].
 ///
 /// Formatting that is not set in a node is inherited from the parent.
-#[derive(Debug, Deserialize, Default)]
+#[derive(Debug, Serialize, Deserialize, Default)]
 pub struct FormattedText {
 	#[serde(default)]
 	/// Text content
 	pub text: String,
 	/// Text color
+	#[serde(skip_serializing_if = "Option::is_none")]
 	pub color: Option<Arc<String>>,
 	/// Bold formatting
+	#[serde(skip_serializing_if = "Option::is_none")]
 	pub bold: Option<bool>,
 	/// Italic formatting
+	#[serde(skip_serializing_if = "Option::is_none")]
 	pub italic: Option<bool>,
 	/// Underlines formatting
+	#[serde(skip_serializing_if = "Option::is_none")]
 	pub underlined: Option<bool>,
 	/// Strikethrough formatting
+	#[serde(skip_serializing_if = "Option::is_none")]
 	pub strikethrough: Option<bool>,
 	/// Obfuscated formatting
+	#[serde(skip_serializing_if = "Option::is_none")]
 	pub obfuscated: Option<bool>,
 }
 
@@ -71,7 +77,7 @@ impl From<String> for FormattedTextTree {
 }
 
 /// List of [FormattedText]
-#[derive(Debug)]
+#[derive(Debug, Serialize, Deserialize)]
 pub struct FormattedTextList(pub Vec<FormattedText>);
 
 impl FormattedTextList {

src/world/mod.rs

@@ -1,5 +1,6 @@
 //! Data structures describing Minecraft save data
 
+pub mod block_entity;
 pub mod chunk;
 pub mod de;
 pub mod json_text;

src/world/sign.rs

@@ -2,6 +2,8 @@
 
 use std::sync::Arc;
 
+use serde::{Deserialize, Serialize};
+
 use super::{
 	de,
 	json_text::{FormattedText, FormattedTextList, JSONText},
@@ -77,6 +79,7 @@ impl BlockEntitySignExt for de::BlockEntitySign {
 	}
 }
 
+#[derive(Debug, Default, Serialize, Deserialize)]
 /// Deserialized and linearized sign text
 pub struct SignText(pub Vec<FormattedTextList>);