1 files changed, 76 insertions, 0 deletions
diff --git a/src/roomtemplate.rs b/src/roomtemplate.rs
new file mode 100644
index 0000000..2a71341
--- /dev/null
+++ b/src/roomtemplate.rs
@@ -0,0 +1,76 @@
+
+use std::collections::HashMap;
+use serde_json::Value;
+use crate::Pos;
+use crate::template::Template;
+
+struct RoomTemplate {
+	size: (i64, i64),
+	spawn: Pos,
+	field: Vec<Vec<Template>>
+}
+
+impl RoomTemplate {
+	
+	pub fn from_json(jsonroom: &Value) -> Result<RoomTemplate, &'static str>{
+		let size = (
+			jsonroom.get("width").ok_or("no with")?.as_i64().ok_or("with not a number")?,
+			jsonroom.get("height").ok_or("no height")?.as_i64().ok_or("height not a number")?
+		);
+		let spawn = Pos::from_json(jsonroom.get("spawn").ok_or("no spawn")?).ok_or("spawn not a pos")?;
+		
+		let mut mapping = HashMap::new();
+		for (key, value) in jsonroom.get("mapping").ok_or("no mapping")?.as_object().ok_or("mapping not a json object")?.iter() {
+			let mut templates: Vec<Template> = Vec::new();
+			if value.is_array() {
+				for template in value.as_array().ok_or("weird")? {
+					templates.push(Template::from_json(template).ok_or("not a valid template")?);
+				}
+			} else {
+				templates.push(Template::from_json(value).ok_or("not a valid template")?);
+			}
+			mapping.insert(key.chars().next().ok_or("mapping key is empty string")?, templates);
+		}
+		
+		let mut field = Vec::new();
+		field.resize((size.0 * size.1) as usize, Vec::new());
+		let jsonfield: &Vec<Value> = jsonroom.get("field").ok_or("no field")?.as_array().ok_or("field not an array")?;
+		for (y, row) in jsonfield.iter().enumerate() {
+			for (x, ch) in row.as_str().ok_or("field row not a string")?.chars().enumerate() {
+				field[x + y * (size.0 as usize)] = mapping.get(&ch).ok_or("char not found in mapping")?.clone();
+			}
+		}
+		Ok(RoomTemplate {
+			size,
+			spawn,
+			field
+		})
+	}
+}
+
+#[cfg(test)]
+mod tests {
+	use super::*;
+	use serde_json::json;
+	
+	#[test]
+	fn simple_from_json() {
+		RoomTemplate::from_json(&json!({
+			"width": 6,
+			"height": 5,
+			"spawn": [1, 1],
+			"field": [
+				"######",
+				"#,,,,#",
+				"#,,,,#",
+				"#....#",
+				"######"
+			],
+			"mapping": {
+				"#": ["wall"],
+				",": "grass",
+				".": {"type": "grass", "args": [], "kwargs": {}}
+			}
+		})).unwrap();
+	}
+}