Parse config file without serde

Cargo.lock

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Cargo.toml

 image = "0.18"
 linked-hash-map = "0.5.0"
 osmpbf = "0.1"
-servo-glutin = "0.13"
-serde = "1.0"
-serde_derive = "1.0"
 reqwest = "0.8"
+servo-glutin = "0.13"
 toml = "0.4"
 
 [build-dependencies]

src/config.rs

-use std::collections::BTreeMap;
+use std::error::Error;
 use std::fs::File;
 use std::io::Read;
 use std::path::{Path, PathBuf};
 use tile_source::TileSource;
-use toml;
+use toml::Value;
 
 
-#[derive(Deserialize, Clone, Debug)]
 pub struct Config {
     tile_cache_dir: String,
-    sources: BTreeMap<String, Source>,
-}
-
-#[derive(Deserialize, Clone, Debug)]
-struct Source {
-    max_zoom: u32,
-    url_template: String,
-    extension: String,
+    sources: Vec<(String, TileSource)>,
 }
 
 impl Config {
-    pub fn from_toml<P: AsRef<Path>>(path: P) -> Option<Config> {
-        let mut file = match File::open(path) {
-            Ok(file) => file,
-            Err(_) => return None,
-        };
+    pub fn from_toml<P: AsRef<Path>>(path: P) -> Result<Config, String> {
+        let mut file = File::open(path).map_err(|e| e.description().to_string())?;
 
         let mut content = String::new();
-        if file.read_to_string(&mut content).is_err() {
-            return None;
-        }
+        file.read_to_string(&mut content).map_err(|e| e.description().to_string())?;
 
-        toml::from_str(&content).ok()
-    }
+        match content.parse::<Value>() {
+            Ok(Value::Table(ref table)) => {
+                let tile_cache_dir = table.get("tile_cache_dir")
+                    .ok_or_else(|| "missing \"tile_cache_dir\" entry".to_string())?
+                    .as_str()
+                    .ok_or_else(|| "tile_cache_dir has to be a string".to_string())?;
+
+                let sources_table = table.get("sources")
+                    .ok_or_else(|| "missing \"sources\" table".to_string())?
+                    .as_table()
+                    .ok_or_else(|| "\"sources\" has to be a table".to_string())?;
+
+                let mut sources_vec: Vec<(String, TileSource)> = Vec::with_capacity(sources_table.len());
+
+                for (id, (name, source)) in sources_table.iter().enumerate() {
+                    let max_zoom = source.get("max_zoom")
+                        .ok_or_else(|| format!("source {:?} is missing \"max_zoom\" entry", name))?
+                        .as_integer()
+                        .ok_or_else(|| "max_zoom has to be an integer".to_string())
+                        .and_then(|m| {
+                            if m <= 0 || m > 30 {
+                                Err(format!("max_zoom = {} is out of bounds. Has to be in interval [1, 30].", m))
+                            } else {
+                                Ok(m)
+                            }
+                        })?;
 
-    pub fn tile_sources(&self) -> Vec<(String, TileSource)> {
-        let mut vec = Vec::with_capacity(self.sources.len());
-
-        for (id, (name, source)) in self.sources.iter().enumerate() {
-            let mut path = PathBuf::from(&self.tile_cache_dir);
-            //TODO escape name (no slashes or dots)
-            path.push(name);
-
-            vec.push((
-                name.clone(),
-                TileSource::new(
-                    id as u32,
-                    source.url_template.clone(),
-                    path,
-                    source.extension.clone(),
-                    source.max_zoom,
-                ),
-            ));
+                    let url_template = source.get("url_template")
+                        .ok_or_else(|| format!("source {:?} is missing \"url_template\" entry", name))?
+                        .as_str()
+                        .ok_or_else(|| "url_template has to be a string".to_string())?;
+
+                    let extension = source.get("extension")
+                        .ok_or_else(|| format!("source {:?} is missing \"extension\" entry", name))?
+                        .as_str()
+                        .ok_or_else(|| "extension has to be a string".to_string())?;
+
+                    if name.contains("/") || name.contains("\\") {
+                        return Err(format!("source name ({:?}) must not contain slashes (\"/\" or \"\\\")", name));
+                    }
+
+                    let mut path = PathBuf::from(&tile_cache_dir);
+                    path.push(name);
+
+                    sources_vec.push((
+                        name.clone(),
+                        TileSource::new(
+                            id as u32,
+                            url_template.to_string(),
+                            path,
+                            extension.to_string(),
+                            max_zoom as u32,
+                        ),
+                    ));
+                }
+
+                Ok(
+                    Config {
+                        tile_cache_dir: tile_cache_dir.to_string(),
+                        sources: sources_vec,
+                    }
+                )
+            },
+            Ok(_) => Err("TOML file has invalid structure. Expected a Table as the top-level element.".to_string()),
+            Err(e) => Err(e.description().to_string()),
         }
+    }
 
-        vec
+    pub fn tile_sources(&self) -> &[(String, TileSource)] {
+        &self.sources
     }
 }

src/main.rs

-#[cfg(target_os = "android")]
-#[macro_use]
-extern crate android_glue;
-
-#[macro_use]
-extern crate serde_derive;
-
 extern crate glutin;
 extern crate image;
 extern crate linked_hash_map;
 extern crate reqwest;
-extern crate serde;
 extern crate toml;
 
 
 use coord::ScreenCoord;
 use glutin::{ElementState, Event, MouseButton, MouseScrollDelta, VirtualKeyCode};
 use map_view_gl::MapViewGl;
-use tile_source::TileSource;
 use std::time::{Duration, Instant};
+use tile_source::TileSource;
 
 #[cfg(target_os = "android")]
 android_start!(main);
     }
 }
 
-struct TileSources {
+struct TileSources<'a> {
     current_index: usize,
-    sources: Vec<(String, TileSource)>,
+    sources: &'a [(String, TileSource)],
 }
 
-impl TileSources {
-    pub fn new(sources: Vec<(String, TileSource)>) -> Option<TileSources> {
+impl<'a> TileSources<'a> {
+    pub fn new(sources: &'a [(String, TileSource)]) -> Option<TileSources> {
         if sources.is_empty() {
             None
         } else {