Enhance docs (i.a. with examples) 📝

- Complete examples for pdf and opentype crates
- Removes allow-unused attributes and fixes their warnings
- Various small improvements

src/doc.rs

@@ -1,5 +1,7 @@
 //! Generation of abstract documents from syntax trees.
 
+#![allow(dead_code)]
+
 use std::fmt;
 use crate::parsing::{SyntaxTree, Node};
 
@@ -39,7 +41,7 @@ pub struct Text(pub String);
 #[derive(Debug, Copy, Clone, PartialEq)]
 pub struct Size {
     /// The size in typographic points (1/72 inches).
-    pub points: f32,
+    points: f32,
 }
 
 impl Size {
@@ -112,7 +114,7 @@ type GenResult<T> = std::result::Result<T, GenerationError>;
 #[derive(Debug, Clone, Eq, PartialEq)]
 pub struct GenerationError {
     /// A message describing the error.
-    pub message: String,
+    message: String,
 }
 
 impl fmt::Display for GenerationError {

src/lib.rs

@@ -1,10 +1,13 @@
-//! Typeset is a library for compiling _plain-text_ strings written in the
-//! corresponding typesetting language into a typesetted document in a
-//! file format like _PDF_.
-
-#![allow(unused)]
+//! Typeset is a library for compiling documents written in the
+//! corresponding typesetting language into a typesetted document in an
+//! output format like _PDF_.
 
+mod pdf;
+mod utility;
 pub mod parsing;
 pub mod doc;
-pub mod pdf;
-pub mod utility;
+
+/// Writing of documents into supported formats.
+pub mod export {
+    pub use crate::pdf::WritePdf;
+}

src/parsing.rs

@@ -322,7 +322,7 @@ type ParseResult<T> = std::result::Result<T, ParseError>;
 #[derive(Debug, Clone, Eq, PartialEq)]
 pub struct ParseError {
     /// A message describing the error.
-    pub message: String,
+    message: String,
 }
 
 impl fmt::Display for ParseError {
@@ -590,7 +590,7 @@ mod token_tests {
 #[cfg(test)]
 mod parse_tests {
     use super::*;
-    use Node::{Space as S, Newline as N, Word as W, Func as F};
+    use Node::{Space as S, Word as W, Func as F};
 
     /// Test if the source code parses into the syntax tree.
     fn test(src: &str, tree: SyntaxTree) {

src/pdf.rs

@@ -45,22 +45,22 @@ impl<W: Write> WritePdf<Document> for W {
             kids: (pages_start .. pages_end).collect(),
             data: PageData {
                 resources: Some(vec![Resource::Font(1, font_start)]),
-                .. PageData::default()
+                .. PageData::none()
             },
         })?;
 
         // The page objects
         let mut id = pages_start;
         for page in &doc.pages {
-            let width = page.size[0].points;
-            let height = page.size[1].points;
+            let width = page.size[0].to_points();
+            let height = page.size[1].to_points();
 
             writer.write_obj(id, &Page {
                 parent: page_tree_id,
                 data: PageData {
                     media_box: Some(Rect::new(0.0, 0.0, width, height)),
                     contents: Some((content_start .. content_end).collect()),
-                    .. PageData::default()
+                    .. PageData::none()
                 },
             })?;
 
@@ -78,12 +78,12 @@ impl<W: Write> WritePdf<Document> for W {
             for content in &page.contents {
                 let string = &content.0;
 
-                let mut text = Text::new();
-                text.set_font(1, 13.0)
+                writer.write_obj(id, &Text::new()
+                    .set_font(1, 13.0)
                     .move_pos(108.0, 734.0)
-                    .write_str(&string);
-
-                writer.write_obj(id, &text.as_stream())?;
+                    .write_str(&string)
+                    .to_stream()
+                )?;
                 id += 1;
             }
         }

src/utility.rs

@@ -12,8 +12,7 @@ pub trait Splinor {
     ///
     /// # Example
     ///
-    /// ```
-    /// # use typeset::utility::*;
+    /// ```ignore
     /// #[derive(Debug, Copy, Clone, PartialEq)]
     /// struct Space;
     ///