First draft of docs.

4 files changed, 103 insertions, 87 deletions

diff --git a/clippy.toml b/clippy.toml
index 935336a..a11f9cf 100644
--- a/clippy.toml
+++ b/clippy.toml
@@ -1 +1,2 @@
 msrv = "1.52.0"
+doc-valid-idents = ["KiB", "MiB", "GiB", "TiB", "PiB", "EiB", "DirectX", "ECMAScript", "GPLv2", "GPLv3", "GitHub", "GitLab", "IPv4", "IPv6", "ClojureScript", "CoffeeScript", "JavaScript", "PureScript", "TypeScript", "NaN", "NaNs", "OAuth", "GraphQL", "OCaml", "OpenGL", "OpenMP", "OpenSSH", "OpenSSL", "OpenStreetMap", "OpenDNS", "WebGL", "TensorFlow", "TrueType", "iOS", "macOS", "FreeBSD", "TeX", "LaTeX", "BibTeX", "BibLaTeX", "MinGW", "CamelCase", "PasswordMaker"]
\ No newline at end of file
diff --git a/src/lib.rs b/src/lib.rs
index e9181c3..a005e43 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,13 +1,22 @@
+#![warn(clippy::pedantic)]
 #![warn(missing_docs)]
-//! Library that should allow quick implementation of tools that are compatible with PasswordMaker Pro.
+//#![allow(clippy::doc_markdown)]
+//! Library that should allow quick implementation of tools that are compatible with [PasswordMaker Pro](https://passwordmaker.org).
 //! 
 //! It forms the core of an upcoming PasswordMaker Pro compatible Sailfish OS App (as of yet unnamed).
 //! This library intentionally does not depend on any specific implementation of the cryptographic hashes
 //! it relies on. To see an example of how to integrate with the [Rust Crypto Hashes](https://github.com/RustCrypto/hashes),
 //! see the integration tests.
 //! 
-//! There are two main functions in this library: [`generate_password`][PasswordMaker::generate_password] and
-//! [`parse()`][UrlParsing::parse].
+//! # Description
+//! There are two types in this library, you'll likely want to use: [`UrlParsing`] and [`PasswordMaker`].
+//! 
+//! [`UrlParsing`] takes a user-supplied string, and generates another string from it, according to the passed in settings.
+//! The idea is to strip unwanted parts of an URI when generating passwords. For instance, you usually want the same result
+//! for all sub-pages of a given website.
+//! 
+//! [`PasswordMaker`] is the main part of this crate. You give it settings similar to those of a PasswordMaker Pro profile,
+//! and it gives you a password that's hopfully the same you'd get from PasswordMaker Pro for the same input.
 
 
 mod passwordmaker;
@@ -55,11 +64,8 @@ pub trait HasherList {
     type RIPEMD160 : Ripemd160;
 }
 
-/// A single-use instance of PasswordMaker, created after all inputs are verified to be usable.
-/// Only has one method, which is to generate the password.
+/// A cached instance of validated `PasswordMaker` settings. See [`new`][PasswordMaker::new] for details.
 pub struct PasswordMaker<'a, T : HasherList>{
-    data : String, //aka url aka used text
-    key : String, //aka master password
     username : &'a str,
     modifier : &'a str,
     password_part_parameters : PasswordPartParameters<'a>, //contains pre_leet, as this is different for different algorithms
@@ -69,43 +75,8 @@ pub struct PasswordMaker<'a, T : HasherList>{
 }
 
 impl<'a, T : HasherList> PasswordMaker<'a, T>{
-    /// Generates a password in a way that's (hopefully) compatible to PasswordMaker Pro. Returns an error for unusable input.
-    /// 
-    /// `data` is the string to use, typically a URL or a part of it.
-    /// `key` is the master password.
-    /// `hash_algorithm` is a PasswordMaker Pro algorithm selection.
-    /// `use_leet` details when to use leet, if at all.
-    /// `characters` is the list of output password characters. Actually this is not true. It's the list of grapheme clusters.
-    /// `username` is the "username" field of PasswordMaker Pro.
-    /// `modifier` is the "modifier" field of PasswordMaker Pro.
-    /// `password_length` is the desired password length to generate.
-    /// `prefix` is the prefix to which the password gets appended. Counts towards `password_length`.
-    /// `suffix` is the suffix appended to the password. Counts towards `password_length`.
-    pub fn generate_password(
-        data : String,
-        key: String,
-        hash_algorithm : HashAlgorithm,
-        use_leet : UseLeetWhenGenerating,
-        characters : &'a str,
-        username : &'a str,
-        modifier: &'a str,
-        password_length : usize,
-        prefix : &'a str,
-        suffix : &'a str,
-    ) -> Result<String, GenerationError>{
-        Ok(
-            Self::validate_input(data, key, hash_algorithm, use_leet, characters, username, modifier, password_length, prefix, suffix)?
-            .generate()
-        )
-    }
-
-
     /// Validates user input and returns a `PasswordMaker` object if the input is valid.
-    /// Use this if you want to split input validation from actual password computation.
-    /// Otherwise, consider using the `generate_password` function for shorter code.
     /// 
-    /// `data` is the string to use, typically a URL or a part of it.
-    /// `key` is the master password.
     /// `hash_algorithm` is a PasswordMaker Pro algorithm selection.
     /// `use_leet` details when to use leet, if at all.
     /// `characters` is the list of output password characters. Actually this is not true. It's the list of grapheme clusters.
@@ -114,9 +85,12 @@ impl<'a, T : HasherList> PasswordMaker<'a, T>{
     /// `password_length` is the desired password length to generate.
     /// `prefix` is the prefix to which the password gets appended. Counts towards `password_length`.
     /// `suffix` is the suffix appended to the password. Counts towards `password_length`.
-    pub fn validate_input(
-        data : String,
-        key: String,
+    /// 
+    /// # Errors
+    /// Fails if characters does not contain at least 2 grapheme clusters. Mapping to output happens by number system conversion,
+    /// and a number system base 1 or base 0 does not make any sense.
+    #[allow(clippy::too_many_arguments)]
+    pub fn new(
         hash_algorithm : HashAlgorithm,
         use_leet : UseLeetWhenGenerating,
         characters : &'a str,
@@ -125,38 +99,43 @@ impl<'a, T : HasherList> PasswordMaker<'a, T>{
         password_length : usize,
         prefix : &'a str,
         suffix : &'a str,
-    ) -> Result<Self, GenerationError> {
-        if data.len() == 0 {
-            Err(GenerationError::MissingTextToUse)
-        } else if key.len() == 0 {
-            Err(GenerationError::MissingMasterPassword)
-        } else if !Self::is_suitable_as_output_characters(characters) {
-            Err(GenerationError::InsufficientCharset)
-        } else {
+    ) -> Result<Self, SettingsError> {
+        if Self::is_suitable_as_output_characters(characters) {
             let post_leet = match &use_leet {
                 UseLeetWhenGenerating::NotAtAll
                  | UseLeetWhenGenerating::Before { .. }
                  => None,
                 UseLeetWhenGenerating::After { level }
                  | UseLeetWhenGenerating::BeforeAndAfter { level }
-                 => Some(LeetReplacementTable::get(level)),
+                 => Some(LeetReplacementTable::get(*level)),
             };
             Ok(PasswordMaker {
-                data,
-                key,
                 username,
                 modifier,
-                password_part_parameters: PasswordPartParameters::from_public_parameters(hash_algorithm, &use_leet, characters),
+                password_part_parameters: PasswordPartParameters::from_public_parameters(hash_algorithm, use_leet, characters),
                 post_leet,
                 assembly_settings: PasswordAssemblyParameters::from_public_parameters(prefix, suffix, password_length),
                 _hashers: PhantomData,
             })
+        } else {
+            Err(SettingsError::InsufficientCharset)
         }
     }
 
-    /// Consumes the PasswordMaker and returns the generated password.
-    pub fn generate(self) -> String {
-        self.generate_password_verified_input()
+    /// Generates a password for the given `data` and `key`.
+    /// `data` is the "text-to-use", typically the output of [`UrlParsing`].
+    /// `key` is the key, also known as "master password".
+    /// 
+    ///  # Errors
+    ///  Fails if either of the parameters has zero-length.
+    pub fn generate(&self, data: String, key: String) -> Result<String, GenerationError> {
+        if data.is_empty() {
+            Err(GenerationError::MissingTextToUse)
+        } else if key.is_empty(){
+            Err(GenerationError::MissingMasterPassword)
+        } else {
+            Ok(self.generate_password_verified_input(data, key))
+        }
     }
 }
 
@@ -164,27 +143,39 @@ impl<'a, T : HasherList> PasswordMaker<'a, T>{
 #[cfg_attr(test, derive(strum_macros::EnumIter))]
 #[derive(Debug,Clone, Copy)]
 pub enum LeetLevel {
-    /// First Leet level: ["4", "b", "c", "d", "3", "f", "g", "h", "i", "j", "k", "1", "m", "n", "0", "p", "9", "r", "s", "7", "u", "v", "w", "x", "y", "z"]
+    /// First Leet level:\
+    /// `["4", "b", "c", "d", "3", "f", "g", "h", "i", "j", "k", "1", "m", "n", "0", "p", "9", "r", "s", "7", "u", "v", "w", "x", "y", "z"]`
     One,
-    /// Second Leet level: ["4", "b", "c", "d", "3", "f", "g", "h", "1", "j", "k", "1", "m", "n", "0", "p", "9", "r", "5", "7", "u", "v", "w", "x", "y", "2"]
+    /// Second Leet level:\
+    /// `["4", "b", "c", "d", "3", "f", "g", "h", "1", "j", "k", "1", "m", "n", "0", "p", "9", "r", "5", "7", "u", "v", "w", "x", "y", "2"]`
     Two,
-    /// Third Leet level: ["4", "8", "c", "d", "3", "f", "6", "h", "'", "j", "k", "1", "m", "n", "0", "p", "9", "r", "5", "7", "u", "v", "w", "x", "'/", "2"]
+    /// Third Leet level:\
+    /// `["4", "8", "c", "d", "3", "f", "6", "h", "'", "j", "k", "1", "m", "n", "0", "p", "9", "r", "5", "7", "u", "v", "w", "x", "'/", "2"]`
     Three,
-    /// Fourth Leet level: ["@", "8", "c", "d", "3", "f", "6", "h", "'", "j", "k", "1", "m", "n", "0", "p", "9", "r", "5", "7", "u", "v", "w", "x", "'/", "2"]
+    /// Fourth Leet level:\
+    /// `["@", "8", "c", "d", "3", "f", "6", "h", "'", "j", "k", "1", "m", "n", "0", "p", "9", "r", "5", "7", "u", "v", "w", "x", "'/", "2"]`
     Four,
-    /// Fifth Leet level: ["@", "|3", "c", "d", "3", "f", "6", "#", "!", "7", "|<", "1", "m", "n", "0", "|>", "9", "|2", "$", "7", "u", "\\/", "w", "x", "'/", "2"]
+    /// Fifth Leet level:\
+    /// `["@", "|3", "c", "d", "3", "f", "6", "#", "!", "7", "|<", "1", "m", "n", "0", "|>", "9", "|2", "$", "7", "u", "\\/", "w", "x", "'/", "2"]`
     Five,
-    /// Sixth Leet level: ["@", "|3", "c", "|)", "&", "|=", "6", "#", "!", ",|", "|<", "1", "m", "n", "0", "|>", "9", "|2", "$", "7", "u", "\\/", "w", "x", "'/", "2"]
+    /// Sixth Leet level:\
+    /// `["@", "|3", "c", "|)", "&", "|=", "6", "#", "!", ",|", "|<", "1", "m", "n", "0", "|>", "9", "|2", "$", "7", "u", "\\/", "w", "x", "'/", "2"]`
     Six,
-    /// Seventh Leet level: ["@", "|3", "[", "|)", "&", "|=", "6", "#", "!", ",|", "|<", "1", "^^", "^/", "0", "|*", "9", "|2", "5", "7", "(_)", "\\/", "\\/\\/", "><", "'/", "2"]
+    /// Seventh Leet level:\
+    /// `["@", "|3", "[", "|)", "&", "|=", "6", "#", "!", ",|", "|<", "1", "^^", "^/", "0", "|*", "9", "|2", "5", "7", "(_)", "\\/", "\\/\\/", "><", "'/", "2"]`
     Seven,
-    /// Eigth Leet level: ["@", "8", "(", "|)", "&", "|=", "6", "|-|", "!", "_|", "|(", "1", "|\\/|", "|\\|", "()", "|>", "(,)", "|2", "$", "|", "|_|", "\\/", "\\^/", ")(", "'/", "\"/_"]
+    /// Eigth Leet level:\
+    /// `["@", "8", "(", "|)", "&", "|=", "6", "|-|", "!", "_|", "|(", "1", "|\\/|", "|\\|", "()", "|>", "(,)", "|2", "$", "|", "|_|", "\\/", "\\^/", ")(", "'/", "\"/_"]`
     Eight,
-    /// Ninth Leet level: ["@", "8", "(", "|)", "&", "|=", "6", "|-|", "!", "_|", "|{", "|_", "/\\/\\", "|\\|", "()", "|>", "(,)", "|2", "$", "|", "|_|", "\\/", "\\^/", ")(", "'/", "\"/_"]
+    /// Ninth Leet level:\
+    /// `["@", "8", "(", "|)", "&", "|=", "6", "|-|", "!", "_|", "|{", "|_", "/\\/\\", "|\\|", "()", "|>", "(,)", "|2", "$", "|", "|_|", "\\/", "\\^/", ")(", "'/", "\"/_"]`
     Nine,
 }
 
 /// The hash algorithm to use, as shown in the GUI of the JavaScript edition of PasswordMaker Pro.
+/// 
+/// # Description 
+/// 
 /// Most algorithms work by computing the hash of the input values and doing a number system base conversion to indices into
 /// the supplied character array.
 /// Notable exceptions are the HMAC algorithms, which not only compute the HMAC for the input, but also, before that, encode the
@@ -221,7 +212,9 @@ pub enum HashAlgorithm {
     HmacRipemd160,
 }
 
-/// When the Leet replacement shown in leet.rs is applied.
+/// When the Leet replacement as illustrated in [`LeetLevel`] is applied.
+/// 
+/// # Description
 /// If Leet is enabled, the input will be converted to lower case.
 /// It is always applied to each password part when the required password length
 /// is longer than the length obtained by computing a single hash. This is important if the input data or output charset contains certain
@@ -259,8 +252,10 @@ pub struct UrlParsing {
     use_port_path : bool,
 }
 
+#[allow(clippy::fn_params_excessive_bools)]
 impl UrlParsing {
     /// Creates a new `UrlParsing` instance with the given settings.
+    #[must_use]
     pub fn new(
         use_protocol : ProtocolUsageMode,
         use_userinfo : bool,
@@ -273,11 +268,15 @@ impl UrlParsing {
 
     /// Parses an input string, applying the settings in `self`, and generates a string suitable for
     /// the `data` parameter of [`PasswordMaker`]
+    #[must_use]
     pub fn parse(&self, input : &str) -> String{
         self.make_used_text_from_url(input)
     }
 }
 
+/// How to handle the URL protocol, or the absence of it, during [`UrlParsing`].
+/// 
+/// # Description
 /// The "Use Protocol" checkbox in PasswordMaker Pro Javascript Edition has some weird behaviour, that's probably a bug.
 /// This enum lets you select how to hande the case that the user wants to use the Protocol, but the input string doesn't contain one.
 #[derive(Debug, Clone, Copy)]
@@ -291,19 +290,15 @@ pub enum ProtocolUsageMode{
     UsedWithUndefinedIfEmpty,
 }
 
+
+
 /// Error returned if the supplied input did not meet expectations.
-/// The two "missing" variants are self-explanatory, but the `InsufficientCharset` might need some explanation:
-/// `InsufficientCharset` means that the output character set does not contain at least two grapheme clusters.
-/// Since the output string is computed by doing a base system conversion from binary to number-of-grapheme-clusters,
-/// any number of grapheme clusters lower than 2 forms a nonsensical input. There simply is no base-1 or base-0 number system.
 #[derive(Debug, Clone, Copy)]
 pub enum GenerationError {
     /// Password generation failed, because the user did not supply a master password.
     MissingMasterPassword,
     /// Password generation failed, because the user did not supply a text-to-use.
     MissingTextToUse,
-    /// Password generation failed, because the character set supplied by the user did not contain at least 2 grapheme clusters.
-    InsufficientCharset
 }
 
 impl Display for GenerationError {
@@ -311,8 +306,29 @@ impl Display for GenerationError {
         match self {
             GenerationError::MissingMasterPassword => write!(f, "No master password given."),
             GenerationError::MissingTextToUse => write!(f, "No text to use. Would just hash the master password."),
-            GenerationError::InsufficientCharset => write!(f, "Charset needs to have at least 2 characters."),
         }
     }
 }
-impl Error for GenerationError{}
\ No newline at end of file
+impl Error for GenerationError{}
+
+
+/// Error returned if creation of a `PasswordMaker` object failed due to invalid settings.
+/// 
+/// # Description
+/// `InsufficientCharset` means that the output character set does not contain at least two grapheme clusters.
+/// Since the output string is computed by doing a base system conversion from binary to number-of-grapheme-clusters,
+/// any number of grapheme clusters lower than 2 forms a nonsensical input. There simply is no base-1 or base-0 number system.
+#[derive(Debug, Clone, Copy)]
+pub enum SettingsError {
+    /// Password generation failed, because the character set supplied by the user did not contain at least 2 grapheme clusters.
+    InsufficientCharset,
+}
+
+impl Display for SettingsError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            SettingsError::InsufficientCharset => write!(f, "Charset needs to have at least 2 characters."),
+        }
+    }
+}
+impl Error for SettingsError{}
\ No newline at end of file
diff --git a/src/passwordmaker/leet.rs b/src/passwordmaker/leet.rs
index 858b2ad..16f27b8 100644
--- a/src/passwordmaker/leet.rs
+++ b/src/passwordmaker/leet.rs
@@ -11,7 +11,7 @@ enum CharOrSlice{
 
 impl LeetReplacementTable {
     /// Gets the appropriate leet replacement table for a given leet level.
-    pub(crate) fn get(leet_level : &LeetLevel) -> LeetReplacementTable {
+    pub(crate) fn get(leet_level : LeetLevel) -> LeetReplacementTable {
         let lookup_table = match leet_level {
             LeetLevel::One => &["4", "b", "c", "d", "3", "f", "g", "h", "i", "j", "k", "1", "m", "n", "0", "p", "9", "r", "s", "7", "u", "v", "w", "x", "y", "z"],
             LeetLevel::Two => &["4", "b", "c", "d", "3", "f", "g", "h", "1", "j", "k", "1", "m", "n", "0", "p", "9", "r", "5", "7", "u", "v", "w", "x", "y", "2"],
@@ -76,7 +76,7 @@ mod leet_tests{
     #[test]
     fn leet_test_icelandic(){
         for leet_level in LeetLevel::iter(){
-            let result = LeetReplacementTable::get(&leet_level).leetify(get_icelandic_test_string());
+            let result = LeetReplacementTable::get(leet_level).leetify(get_icelandic_test_string());
             let expected = get_icelandic_test_result(leet_level);
             assert_eq!(result, expected);
         }
@@ -92,7 +92,7 @@ mod leet_tests{
     #[test]
     fn leet_test_greek(){
         for leet_level in LeetLevel::iter(){
-            let result = LeetReplacementTable::get(&leet_level).leetify(get_greek_test_string());
+            let result = LeetReplacementTable::get(leet_level).leetify(get_greek_test_string());
             let expected = get_greek_test_result(leet_level);
             assert_eq!(result, expected);
         }
diff --git a/src/passwordmaker/mod.rs b/src/passwordmaker/mod.rs
index eb39c9e..ba85623 100644
--- a/src/passwordmaker/mod.rs
+++ b/src/passwordmaker/mod.rs
@@ -18,18 +18,17 @@ impl<'y, H : super::HasherList> super::PasswordMaker<'y, H>{
         characters.graphemes(true).nth(1).is_some()
     }
 
-    pub(super) fn generate_password_verified_input(self) -> String {
-        let modified_data = self.data + self.username + self.modifier;
-        let key = self.key;
+    pub(super) fn generate_password_verified_input(&self, data : String, key : String) -> String {
+        let modified_data = data + self.username + self.modifier;
         let get_modified_key = move |i : usize| { if i == 0 {key.clone()} else {key.clone() + "\n" + &i.to_string()}};
     
         //In Passwordmaker Pro, leet is applied on a per-password-part basis. This means that if a password part ends in an upper-case Sigma,
         //the results would differ if we moved leeting to after all password parts were joined, or worse, did it on a per-character level.
         //However, this makes the code a lot more complex, as it forces us to create an owned string for each password part before combining.
         //Therefore, we treat that case special.
-        match self.post_leet {
+        match &self.post_leet {
             None => Self::generate_password_verified_no_post_leet(&modified_data, get_modified_key, &self.assembly_settings, &self.password_part_parameters),
-            Some(leet_level) => Self::generate_password_verified_with_post_leet(&modified_data, get_modified_key,&self.assembly_settings , &self.password_part_parameters, &leet_level),
+            Some(leet_level) => Self::generate_password_verified_with_post_leet(&modified_data, get_modified_key,&self.assembly_settings , &self.password_part_parameters, leet_level),
         }
     }
 
@@ -247,7 +246,7 @@ pub(super) struct PasswordPartParameters<'a>{
 }
 
 impl<'a> PasswordPartParameters<'a>{
-    pub(super) fn from_public_parameters(hash_algorithm : super::HashAlgorithm, leet : &super::UseLeetWhenGenerating, characters : &'a str) -> Self {
+    pub(super) fn from_public_parameters(hash_algorithm : super::HashAlgorithm, leet : super::UseLeetWhenGenerating, characters : &'a str) -> Self {
         use super::UseLeetWhenGenerating;
         let hash_algorithm = AlgoSelection::from_settings_algorithm(hash_algorithm);
         PasswordPartParameters{