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chore: Initial commit 

The commits leading to this point can be found in the trinitrix/core
repository
This commit is contained in:
Benedikt Peetz 2023-12-23 22:41:29 +01:00
commit 2f9942640a
Signed by: bpeetz
GPG Key ID: A5E94010C3A642AD
21 changed files with 2540 additions and 0 deletions
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use flake || use nix
watch_file flake.nix
if on_git_branch; then
echo && git status --short --branch &&
echo && git fetch --verbose
fi

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# build
/target
/result
# direnv
.direnv
# keymaps is a library
Cargo.lock

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---
# Regexes which if matched by a file path will always be excluded from
# getting a license header
excludes:
- \.gitignore
- .*lock
- \.git/.*
- \.licensure\.yml
- README.*
- LICENSE.spdx
- COPYING
- COPYING.LESSER
- .*\.(md|rst|txt|pdf)
# Definition of the licenses used on this project and to what files
# they should apply.
#
# No default license configuration is provided. This section must be
# configured by the user.
licenses:
# Either a regex or the string "any" to determine to what files this
# license should apply. It is common for projects to have files
# under multiple licenses or with multiple copyright holders. This
# provides the ability to automatically license files correctly
# based on their file paths.
#
# If "any" is provided all files will match this license.
- files: any
#
# The license identifier, a list of common identifiers can be
# found at: https://spdx.org/licenses/ but existence of the ident
# in this list it is not enforced unless auto_template is set to
# true.
ident: LGPL-3.0-or-later
#
# A list of authors who hold copyright over these files
authors:
# Provide either your full name or company name for copyright purposes
- name: The Trinitrix Project
# Optionally provide email for copyright purposes
email: "soispha@vhack.eu, antifallobst@systemausfall.org"
#
# The template that will be rendered to generate the header before
# comment characters are applied. Available variables are:
# - [year]: substituted with the current year.
# - [name of author]: Substituted with name of the author and email
# if provided. If email is provided the output appears as Full
# Name <email@example.com>. If multiple authors are provided the
# list is concatenated together with commas.
template: |
Copyright (C) [year] [name of author]
This file is part of the Keymaps crate for Trinitrix.
Keymaps is free software: you can redistribute it and/or modify
it under the terms of the Lesser GNU General Public License as
published by the Free Software Foundation, either version 3 of
the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
and the Lesser GNU General Public License along with this program.
If not, see <https://www.gnu.org/licenses/>.
#
# If auto_template is true then template is ignored and the SPDX
# API will be queried with the ident value to automatically
# determine the license header template. auto_template works best
# with licenses that have a standardLicenseHeader field defined in
# their license info JSON, if it is not then we will use the full
# licenseText to generate the header which works fine for short
# licenses like MIT but can be quite lengthy for other licenses
# like BSD-4-Clause. The above default template is valid for most
# licenses and is recommended for MIT, and BSD licenses. Common
# licenses that work well with the auto_template feature are GPL
# variants, and the Apache 2.0 license.
#
# Important Note: this means the ident must be a valid SPDX identifier
# auto_template: true
#
# If true try to detect the text wrapping of the template, and unwrap it
unwrap_text: false
# Define type of comment characters to apply based on file extensions.
comments:
# The extensions (or singular extension) field defines which file
# extensions to apply the commenter to.
- extensions:
- js
- go
- pest
# The commenter field defines the kind of commenter to
# generate. There are two types of commenters: line and block.
#
# This demonstrates a line commenter configuration. A line
# commenter type will apply the comment_char to the beginning of
# each line in the license header. It will then apply a number of
# empty newlines to the end of the header equal to trailing_lines.
#
# If trailing_lines is omitted it is assumed to be 0.
commenter:
type: line
comment_char: "//"
trailing_lines: 2
- extensions:
- rs
- tri
- css
- cpp
- c
# This demonstrates a block commenter configuration. A block
# commenter type will add start_block_char as the first character
# in the license header and add end_block_char as the last character
# in the license header. If per_line_char is provided each line of
# the header between the block start and end characters will be
# line commented with the per_line_char
#
# trailing_lines works the same for both block and line commenter
# types
commenter:
type: block
start_block_char: "/*\n"
end_block_char: "*/\n"
per_line_char: "*"
trailing_lines: 2
# In this case extension is singular and a single string extension is provided.
- extension: html
commenter:
type: block
start_block_char: "<!--\n"
end_block_char: "-->"
- extensions:
- el
- lisp
commenter:
type: line
comment_char: ";;;"
trailing_lines: 2
- extensions:
- ebnf
commenter:
type: block
start_block_char: "#(*\n"
end_block_char: "#*)\n"
per_line_char: "#"
trailing_lines: 2
# The extension string "any" is special and so will match any file
# extensions. Commenter configurations are always checked in the
# order they are defined, so if any is used it should be the last
# commenter configuration or else it will override all others.
#
# In this configuration if we can't match the file extension we fall
# back to the popular '#' line comment used in most scripting
# languages.
- extension: any
commenter:
type: line
comment_char: '#'
trailing_lines: 2

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GNU GENERAL PUBLIC LICENSE
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contain the covered work, unless you entered into that arrangement,
or that patent license was granted, prior to 28 March 2007.
Nothing in this License shall be construed as excluding or limiting
any implied license or other defenses to infringement that may
otherwise be available to you under applicable patent law.
12. No Surrender of Others' Freedom.
If conditions are imposed on you (whether by court order, agreement or
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not convey it at all. For example, if you agree to terms that obligate you
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License would be to refrain entirely from conveying the Program.
13. Use with the GNU Affero General Public License.
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permission to link or combine any covered work with a work licensed
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License will continue to apply to the part which is the covered work,
but the special requirements of the GNU Affero General Public License,
section 13, concerning interaction through a network will apply to the
combination as such.
14. Revised Versions of this License.
The Free Software Foundation may publish revised and/or new versions of
the GNU General Public License from time to time. Such new versions will
be similar in spirit to the present version, but may differ in detail to
address new problems or concerns.
Each version is given a distinguishing version number. If the
Program specifies that a certain numbered version of the GNU General
Public License "or any later version" applies to it, you have the
option of following the terms and conditions either of that numbered
version or of any later version published by the Free Software
Foundation. If the Program does not specify a version number of the
GNU General Public License, you may choose any version ever published
by the Free Software Foundation.
If the Program specifies that a proxy can decide which future
versions of the GNU General Public License can be used, that proxy's
public statement of acceptance of a version permanently authorizes you
to choose that version for the Program.
Later license versions may give you additional or different
permissions. However, no additional obligations are imposed on any
author or copyright holder as a result of your choosing to follow a
later version.
15. Disclaimer of Warranty.
THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
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PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
16. Limitation of Liability.
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
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USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
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PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
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17. Interpretation of Sections 15 and 16.
If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely approximates
an absolute waiver of all civil liability in connection with the
Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.
END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

165
COPYING.LESSER Normal file
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@ -0,0 +1,165 @@
GNU LESSER GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
This version of the GNU Lesser General Public License incorporates
the terms and conditions of version 3 of the GNU General Public
License, supplemented by the additional permissions listed below.
0. Additional Definitions.
As used herein, "this License" refers to version 3 of the GNU Lesser
General Public License, and the "GNU GPL" refers to version 3 of the GNU
General Public License.
"The Library" refers to a covered work governed by this License,
other than an Application or a Combined Work as defined below.
An "Application" is any work that makes use of an interface provided
by the Library, but which is not otherwise based on the Library.
Defining a subclass of a class defined by the Library is deemed a mode
of using an interface provided by the Library.
A "Combined Work" is a work produced by combining or linking an
Application with the Library. The particular version of the Library
with which the Combined Work was made is also called the "Linked
Version".
The "Minimal Corresponding Source" for a Combined Work means the
Corresponding Source for the Combined Work, excluding any source code
for portions of the Combined Work that, considered in isolation, are
based on the Application, and not on the Linked Version.
The "Corresponding Application Code" for a Combined Work means the
object code and/or source code for the Application, including any data
and utility programs needed for reproducing the Combined Work from the
Application, but excluding the System Libraries of the Combined Work.
1. Exception to Section 3 of the GNU GPL.
You may convey a covered work under sections 3 and 4 of this License
without being bound by section 3 of the GNU GPL.
2. Conveying Modified Versions.
If you modify a copy of the Library, and, in your modifications, a
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You may place library facilities that are a work based on the
Library side by side in a single library together with other library
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License, and convey such a combined library under terms of your
choice, if you do both of the following:
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on the Library, uncombined with any other library facilities,
conveyed under the terms of this License.
b) Give prominent notice with the combined library that part of it
is a work based on the Library, and explaining where to find the
accompanying uncombined form of the same work.
6. Revised Versions of the GNU Lesser General Public License.
The Free Software Foundation may publish revised and/or new versions
of the GNU Lesser General Public License from time to time. Such new
versions will be similar in spirit to the present version, but may
differ in detail to address new problems or concerns.
Each version is given a distinguishing version number. If the
Library as you received it specifies that a certain numbered version
of the GNU Lesser General Public License "or any later version"
applies to it, you have the option of following the terms and
conditions either of that published version or of any later version
published by the Free Software Foundation. If the Library as you
received it does not specify a version number of the GNU Lesser
General Public License, you may choose any version of the GNU Lesser
General Public License ever published by the Free Software Foundation.
If the Library as you received it specifies that a proxy can decide
whether future versions of the GNU Lesser General Public License shall
apply, that proxy's public statement of acceptance of any version is
permanent authorization for you to choose that version for the
Library.

20
Cargo.toml Normal file
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@ -0,0 +1,20 @@
[package]
name = "keymaps"
version = "0.1.0"
edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[features]
default = []
crossterm = ["dep:crossterm"]
[dependencies]
crossterm = { version = "0.25", optional = true }
log = "0.4.20"
thiserror = "1.0.50"
pest = "2.7.5"
pest_derive = {version = "2.7.5", features = ["grammar-extras"]}
[dev-dependencies]
pretty_assertions = "1.4.0"

7
LICENSE.spdx Normal file
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@ -0,0 +1,7 @@
SPDXVersion: SPDX-2.3
DataLicense: CC0-1.0
Creator: trinitrix contributers
PackageName: Trinitrix-keymaps
PackageOriginator: trinitrix contributers
PackageHomePage: https://git.nerdcult.net/trinitrix/keymaps
PackageLicenseDeclared: LGPL-3.0-or-later

31
cog.toml Normal file
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tag_prefix = "v"
branch_whitelist = [ "main" ]
ignore_merge_commits = false
[commit_types]
pre_bump_hooks = [
"licensur -p -i" # update the license header in each file
"nix build", # verify the project builds
"cargo fmt --all" # format
"cargo set-version {{version}}", # bump version in Cargo.toml
]
post_bump_hooks = [
"git push",
"cargo publish",
"git push origin v{{version}}", # push the new tag to origin
]
[bump_profiles]
[changelog]
path = "NEWS.md"
remote = "git.nerdcult.net"
repository = "keymaps"
owner = "trinitrix"
authors = [
{ signature = "Soispha", username = "soispha" },
]
[packages]

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flake.lock Normal file
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@ -0,0 +1,123 @@
{
"nodes": {
"crane": {
"inputs": {
"nixpkgs": [
"nixpkgs"
]
},
"locked": {
"lastModified": 1703089493,
"narHash": "sha256-WUjYqUP/Lhhop9+aiHVFREgElunx1AHEWxqMT8ePfzo=",
"owner": "ipetkov",
"repo": "crane",
"rev": "2a5136f14a9ac93d9d370d64a36026c5de3ae8a4",
"type": "github"
},
"original": {
"owner": "ipetkov",
"repo": "crane",
"type": "github"
}
},
"flake-compat": {
"flake": false,
"locked": {
"lastModified": 1696426674,
"narHash": "sha256-kvjfFW7WAETZlt09AgDn1MrtKzP7t90Vf7vypd3OL1U=",
"owner": "edolstra",
"repo": "flake-compat",
"rev": "0f9255e01c2351cc7d116c072cb317785dd33b33",
"type": "github"
},
"original": {
"owner": "edolstra",
"repo": "flake-compat",
"type": "github"
}
},
"flake-utils": {
"inputs": {
"systems": "systems"
},
"locked": {
"lastModified": 1701680307,
"narHash": "sha256-kAuep2h5ajznlPMD9rnQyffWG8EM/C73lejGofXvdM8=",
"owner": "numtide",
"repo": "flake-utils",
"rev": "4022d587cbbfd70fe950c1e2083a02621806a725",
"type": "github"
},
"original": {
"owner": "numtide",
"repo": "flake-utils",
"type": "github"
}
},
"nixpkgs": {
"locked": {
"lastModified": 1703349974,
"narHash": "sha256-BcR1wW63W4baNtWbpg25d/mt0DVkEBIFssAY9JPNpZg=",
"owner": "soispha",
"repo": "nixpkgs",
"rev": "7e33c3c5db1c69a50efc2143ffa53539e8b4c0ed",
"type": "github"
},
"original": {
"owner": "soispha",
"ref": "licensure",
"repo": "nixpkgs",
"type": "github"
}
},
"root": {
"inputs": {
"crane": "crane",
"flake-compat": "flake-compat",
"flake-utils": "flake-utils",
"nixpkgs": "nixpkgs",
"rust-overlay": "rust-overlay"
}
},
"rust-overlay": {
"inputs": {
"flake-utils": [
"flake-utils"
],
"nixpkgs": [
"nixpkgs"
]
},
"locked": {
"lastModified": 1703297543,
"narHash": "sha256-d4QlzcoSNzb/iZheWtjOyRxoBSaLETSpViENGEkxv9g=",
"owner": "oxalica",
"repo": "rust-overlay",
"rev": "fc77c8b416b1537522d30c710baaaaebf769f816",
"type": "github"
},
"original": {
"owner": "oxalica",
"repo": "rust-overlay",
"type": "github"
}
},
"systems": {
"locked": {
"lastModified": 1681028828,
"narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
"owner": "nix-systems",
"repo": "default",
"rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
"type": "github"
},
"original": {
"owner": "nix-systems",
"repo": "default",
"type": "github"
}
}
},
"root": "root",
"version": 7
}

112
flake.nix Normal file
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# Copyright (C) 2023 The Trinitrix Project <soispha@vhack.eu, antifallobst@systemausfall.org>
#
# This file is part of the Trixy crate for Trinitrix.
#
# Trixy is free software: you can redistribute it and/or modify
# it under the terms of the Lesser GNU General Public License as
# published by the Free Software Foundation, either version 3 of
# the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# and the Lesser GNU General Public License along with this program.
# If not, see <https://www.gnu.org/licenses/>.
{
description = "A rust crate which provides a standatised encoding for keycodes";
inputs = {
# nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
nixpkgs.url = "github:soispha/nixpkgs/licensure";
# inputs for following
flake-compat = {
url = "github:edolstra/flake-compat";
flake = false;
};
crane = {
url = "github:ipetkov/crane";
inputs = {
nixpkgs.follows = "nixpkgs";
};
};
flake-utils = {
url = "github:numtide/flake-utils";
inputs = {};
};
rust-overlay = {
url = "github:oxalica/rust-overlay";
inputs = {
nixpkgs.follows = "nixpkgs";
flake-utils.follows = "flake-utils";
};
};
};
outputs = {
nixpkgs,
crane,
flake-utils,
rust-overlay,
...
}:
flake-utils.lib.eachDefaultSystem (system: let
pkgs = import nixpkgs {
inherit system;
overlays = [(import rust-overlay)];
};
nightly = false;
rust =
if nightly
then
(pkgs.rust-bin.selectLatestNightlyWith (toolchain:
toolchain.default))
.override {
extensions = ["rustc-codegen-cranelift-preview"];
}
else pkgs.rust-bin.stable.latest.default;
rust_min =
if nightly
then
(pkgs.rust-bin.selectLatestNightlyWith (toolchain:
toolchain.minimal))
.override {
extensions = ["rustc-codegen-cranelift-preview"];
}
else pkgs.rust-bin.stable.latest.minimal;
craneLib = (crane.mkLib pkgs).overrideToolchain rust_min;
nativeBuildInputs = [];
buildInputs = [];
craneBuild = craneLib.buildPackage {
src = craneLib.cleanCargoSource ./.;
doCheck = true;
inherit nativeBuildInputs buildInputs;
};
in {
checks.default = craneBuild;
packages = {
default = craneBuild;
};
devShells.default = pkgs.mkShell {
packages = with pkgs; [
alejandra
cocogitto
licensure
rust
cargo-edit
cargo-expand
];
inherit nativeBuildInputs buildInputs;
};
});
}

46
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use std::{fmt::Display, num::ParseIntError};
use thiserror::Error;
use crate::key_repr::{key, keys, Keys};
#[derive(Error, Debug)]
pub enum TrieInsertError<V: Display> {
#[error("The key ('{0}') contains nodes, which already have a value set!")]
KeyPathBlocked(Keys),
#[error("The key ('{key}') already has a value associatet with it, which is: '{value}'")]
KeyAlreadySet { key: Keys, value: V },
#[error("The node accessed by this key ('{0}') already has children! You can not set a value for it")]
NodeHasChildren(Keys),
}
#[derive(Error, Debug)]
pub enum KeyParseError {
#[error("This key expression could not be parsed, see the error message for more: {0}")]
RawParseError(#[from] pest::error::Error<key::Rule>),
}
#[derive(Error, Debug)]
pub enum KeysParseError {
#[error(
"This chain of key expressions could not be parsed, see the error message for more: {0}"
)]
RawParseError(#[from] pest::error::Error<keys::Rule>),
}
#[derive(Error, Debug)]
pub enum KeyValueParseError {
#[error("The String ('{0}') is not a correct special key name!")]
NoMatch(String),
#[error("The number associate with the F key ('{0}') can't be parsed as u8!")]
CantParseFNumber(#[from] ParseIntError),
}
#[derive(Error, Debug)]
pub enum KeyFromCrossterm {
#[error("Can not parse non Key event to a Key code: ('{0:?}')")]
OnlyKey(crossterm::event::Event),
}

76
src/key_repr/key/crossterm.rs Normal file
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use crossterm::event::{Event, KeyCode, KeyEvent, KeyEventKind, KeyEventState, KeyModifiers};
use crate::{error, key_repr::KeyValue};
use super::Key;
impl Into<Event> for Key {
fn into(self) -> Event {
let mut modifiers;
{
modifiers = KeyModifiers::all();
if !self.alt {
modifiers.remove(KeyModifiers::ALT);
}
if !self.ctrl {
modifiers.remove(KeyModifiers::CONTROL);
}
if !self.meta {
modifiers.remove(KeyModifiers::META);
modifiers.remove(KeyModifiers::SUPER);
}
if !self.shift {
modifiers.remove(KeyModifiers::SHIFT);
}
modifiers.remove(KeyModifiers::HYPER);
modifiers.remove(KeyModifiers::META);
if self.alt || self.ctrl || self.meta || self.shift {
modifiers.remove(KeyModifiers::NONE);
}
}
let output = Event::Key(KeyEvent {
code: {
if let Some(KeyValue::Char(char)) = self.value {
KeyCode::Char(char)
} else {
self.value.unwrap_or(KeyValue::Null).into()
}
},
modifiers,
kind: KeyEventKind::Press,
state: KeyEventState::NONE,
});
output
}
}
impl TryFrom<&Event> for Key {
type Error = error::KeyFromCrossterm;
fn try_from(value: &Event) -> std::result::Result<Self, Self::Error> {
let mut output_key: Key = Key::new();
match value {
Event::Key(key_event) => {
{
let key_mods = key_event.modifiers;
output_key.alt = KeyModifiers::intersects(&key_mods, KeyModifiers::ALT);
output_key.ctrl = KeyModifiers::intersects(&key_mods, KeyModifiers::CONTROL);
output_key.meta = KeyModifiers::intersects(&key_mods, KeyModifiers::META)
|| KeyModifiers::intersects(&key_mods, KeyModifiers::SUPER);
output_key.shift = KeyModifiers::intersects(&key_mods, KeyModifiers::SHIFT);
// let hyper = KeyModifiers::intersects(&key_mods, KeyModifiers::HYPER);
// let none = KeyModifiers::intersects(&key_mods, KeyModifiers::NONE);
}
{
output_key.value = Some(key_event.code.into());
}
Ok(output_key)
}
event => Err(error::KeyFromCrossterm::OnlyKey(event.to_owned())),
}
}
}

70
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#[cfg(feature = "crossterm")]
mod crossterm;
mod parsing;
use std::fmt::Display;
use pest_derive::Parser;
use super::KeyValue;
#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Clone, Copy, Default, Parser)]
#[grammar = "./key_repr/key_representation.pest"]
pub struct Key {
// Modifiers
pub(super) alt: bool,
pub(super) ctrl: bool,
pub(super) meta: bool,
pub(super) shift: bool,
pub(super) value: Option<KeyValue>,
}
impl Key {
pub fn new() -> Self {
Self::default()
}
pub fn value(&self) -> Option<&KeyValue> {
self.value.as_ref()
}
pub fn to_string_repr(self) -> String {
let mut output = String::new();
if self.alt || self.ctrl || self.meta || self.shift {
output.push('<')
}
if self.alt {
output.push('A');
}
if self.ctrl {
output.push('C');
}
if self.meta {
output.push('M');
}
if self.shift {
output.push('S');
}
if self.alt || self.ctrl || self.meta || self.shift {
output.push('-')
}
output.push_str(
&self
.value
.expect("There can be no `None`s here, if the Key comes from the public api")
.to_string(),
);
if self.alt || self.ctrl || self.meta || self.shift {
output.push('>')
}
output
}
}
impl Display for Key {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
f.write_str(&self.to_string_repr())
}
}

213
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use std::{fmt::Debug, hash::Hash, marker, str::FromStr};
use pest::{iterators::Pair, Parser};
use crate::{error, key_repr::{KeyValue, key::Rule}};
use super::Key;
impl Key {
pub fn from_pair<R>(pair: Pair<R>) -> Self
where
R: marker::Copy + Debug + Hash + Ord,
{
let pairs = pair.into_inner();
let mut output = Self::default();
let modifiers: Vec<_> = pairs.clone().find_tagged("modifiers").collect();
let values: Vec<_> = pairs.clone().find_tagged("value").collect();
let special_keys: Vec<_> = pairs.find_tagged("special_key").collect();
for modifier in modifiers {
match modifier.as_span().as_str() {
"A" => output.alt = true,
"C" => output.ctrl = true,
"M" => output.meta = true,
"S" => output.shift = true,
_ => unreachable!("This modifier should not have been parsed"),
}
}
if values.is_empty() {
// Check that we have parsed *something*
debug_assert!(!special_keys.is_empty());
// Check, that we have only parsed one special key
debug_assert_eq!(special_keys.len(), 1);
let special_key_value: KeyValue = special_keys
.first()
.expect("This should exist (and be the only value)")
.as_str()
.parse()
.expect("This was parsed, and should thus be a valid special_key");
output.value = Some(special_key_value);
} else {
// Check, that we have only parsed one key
debug_assert_eq!(values.len(), 1);
let key_str = values.first().expect("This should exist").as_str();
// Check that we really only have a one char &str
debug_assert_eq!(key_str.chars().count(), 1);
let key_value: KeyValue = KeyValue::Char(
key_str
.chars()
.nth(0)
.expect("This &str should have a length of exactly one char"),
);
output.value = Some(key_value);
}
output
}
// pub(super) fn parse_old(chars: &mut Chars) -> anyhow::Result<Self> {
// assert_eq!(chars.pop().expect("This is a developer error"), '<');
// let mut parse_buffer: Vec<char> = Vec::new();
//
// let mut reached_non_modifier = false;
// let mut output_key_filled = false;
// let mut output_key = Key::new();
// while let Some(char) = chars.pop() {
// if char == '>' {
// break;
// } else {
// if char.is_ascii_uppercase()
// || char.is_numeric() && !reached_non_modifier && !output_key_filled
// {
// parse_buffer.push(char);
// } else if char == '-' && !reached_non_modifier && !output_key_filled {
// // We moved to the modified char
// reached_non_modifier = true;
//
// // Our parse_buffer should only contain modifiers:
// let mut alt = false;
// let mut ctrl = false;
// let mut meta = false;
// let mut shift = false;
//
// for char in &parse_buffer {
// match char {
// 'A' => alt = true,
// 'C' => ctrl = true,
// 'M' => meta = true,
// 'S' => shift = true,
// char => bail!(
// "The char ('{}') is not a valid descriptor of a modifier",
// char
// ),
// }
// }
// output_key = Key {
// alt,
// ctrl,
// meta,
// shift,
// value: None,
// };
// } else if reached_non_modifier && !output_key_filled {
// if char == '<' {
// chars.prepend('<');
// let key = Key::parse(chars)?;
// output_key = output_key.merge_with(key);
// } else {
// output_key.value = Some(KeyValue::Char(char));
// }
// output_key_filled = true;
// } else {
// bail!(
// "Your can not put a this char here!
// parse_buffer: '{}';
// char: '{}';
// chars: '{:#?}';
// output_key: '{:#?}' ",
// &parse_buffer.iter().collect::<String>(),
// &char,
// &chars,
// &output_key
// )
// }
// }
// }
// if output_key_filled {
// Ok(output_key)
// } else {
// let mut parse_buffer = Chars(parse_buffer.into());
// let get_output = |value: KeyValue| -> Key {
// let key = Key {
// alt: false,
// ctrl: false,
// meta: false,
// shift: false,
// value: Some(value),
// };
//
// return key.merge_with(output_key);
// };
// if let Some(char) = parse_buffer.peek() {
// if char == &'F' {
// let _f = parse_buffer.pop();
// let number: u8 = parse_buffer.to_string().parse().with_context(|| {
// format!("Failed to parse buffer ('{}') as u8", &parse_buffer)
// })?;
// Ok(get_output(KeyValue::F(number)))
// } else {
// match &parse_buffer.to_string()[..] {
// "BACKSPACE" => Ok(get_output(KeyValue::Backspace)),
// "ENTER" => Ok(get_output(KeyValue::Enter)),
// "LEFT" => Ok(get_output(KeyValue::Left)),
// "RIGHT" => Ok(get_output(KeyValue::Right)),
// "UP" => Ok(get_output(KeyValue::Up)),
// "DOWN" => Ok(get_output(KeyValue::Down)),
// "HOME" => Ok(get_output(KeyValue::Home)),
// "END" => Ok(get_output(KeyValue::End)),
// "PAGEUP" => Ok(get_output(KeyValue::PageUp)),
// "PAGEDOWN" => Ok(get_output(KeyValue::PageDown)),
// "TAB" => Ok(get_output(KeyValue::Tab)),
// "BACKTAB" => Ok(get_output(KeyValue::BackTab)),
// "DELETE" => Ok(get_output(KeyValue::Delete)),
// "INSERT" => Ok(get_output(KeyValue::Insert)),
// "ESC" => Ok(get_output(KeyValue::Esc)),
// "CAPSLOCK" => Ok(get_output(KeyValue::CapsLock)),
// "SCROLLlOCK" => Ok(get_output(KeyValue::ScrollLock)),
// "NUMLOCK" => Ok(get_output(KeyValue::NumLock)),
// "PRINTSCREEN" => Ok(get_output(KeyValue::PrintScreen)),
// "PAUSE" => Ok(get_output(KeyValue::Pause)),
// "MENU" => Ok(get_output(KeyValue::Menu)),
// "KEYPADBEGIN" => Ok(get_output(KeyValue::KeypadBegin)),
//
// "DASH" => Ok(get_output(KeyValue::Char('-'))),
// "ANGULAR_BRACKET_OPEN" | "ABO" => Ok(get_output(KeyValue::Char('<'))),
// "ANGULAR_BRACKET_CLOSE" | "ABC" => Ok(get_output(KeyValue::Char('>'))),
// other_str => bail!(
// "The String ('{}') is not a correct special key name!",
// other_str
// ),
// }
// }
// } else {
// bail!(
// "You need to put something into the angulare brackets (<>)
// parse_buffer: '{}';
// chars: '{:#?}';",
// &parse_buffer,
// &chars,
// )
// }
// }
// }
}
impl FromStr for Key {
type Err = error::KeyParseError;
fn from_str(s: &str) -> Result<Self, Self::Err> {
let mut key_pairs: Vec<_> = Self::parse(Rule::key, s)?.find_tagged("key").collect();
debug_assert_eq!(key_pairs.len(), 1);
let key: Key = Self::from_pair::<Rule>(
key_pairs
.pop()
.expect("This should contain only this first (and last) element"),
);
Ok(key)
}
}

60
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angular_bracket_open = _{ "<" }
abo = _{ angular_bracket_open }
angular_bracket_close = _{ ">" }
abc = _{ angular_bracket_close }
special_key = {
"BACKSPACE"
| "ENTER"
| "LEFT"
| "RIGHT"
| "UP"
| "DOWN"
| "HOME"
| "END"
| "PAGEUP"
| "PAGEDOWN"
| "TAB"
| "BACKTAB"
| "DELETE"
| "INSERT"
| "ESC"
| "CAPSLOCK"
| "SCROLLlOCK"
| "NUMLOCK"
| "PRINTSCREEN"
| "PAUSE"
| "MENU"
| "KEYPADBEGIN"
| ("F" ~ ASCII_DIGIT+)
// Aliases to make using them easier, as they are also used in the notation
| "DASH"
| "ANGULAR_BRACKET_OPEN"
| "ABO"
| "ANGULAR_BRACKET_CLOSE"
| "ABC"
}
modifier = {
"A" | // Alt
"C" | // Ctrl
"M" | // Meta
"S" // Shift
}
value = {
!abo ~ ANY
}
raw_key = {
((abo ~ (#modifiers = modifier)+ ~ "-" ~ (#special_key = (abo ~ special_key ~ abc) | #value = value) ~ abc) | #special_key = (abo ~ special_key ~ abc) | #value = value)
}
// api
key = {
SOI ~ #key = raw_key ~ EOI
}
keys = {
SOI ~ (#keys = raw_key)+ ~ EOI
}

70
src/key_repr/key_value/crossterm.rs Normal file
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use crossterm::event::KeyCode;
use super::KeyValue;
impl From<KeyCode> for KeyValue {
fn from(value: KeyCode) -> Self {
match value {
KeyCode::Backspace => Self::Backspace,
KeyCode::Enter => Self::Enter,
KeyCode::Left => Self::Left,
KeyCode::Right => Self::Right,
KeyCode::Up => Self::Up,
KeyCode::Down => Self::Down,
KeyCode::Home => Self::Home,
KeyCode::End => Self::End,
KeyCode::PageUp => Self::PageUp,
KeyCode::PageDown => Self::PageDown,
KeyCode::Tab => Self::Tab,
KeyCode::BackTab => Self::BackTab,
KeyCode::Delete => Self::Delete,
KeyCode::Insert => Self::Insert,
KeyCode::F(n) => Self::F(n),
KeyCode::Char(c) => Self::Char(c),
KeyCode::Null => Self::Null,
KeyCode::Esc => Self::Esc,
KeyCode::CapsLock => Self::CapsLock,
KeyCode::ScrollLock => Self::ScrollLock,
KeyCode::NumLock => Self::NumLock,
KeyCode::PrintScreen => Self::PrintScreen,
KeyCode::Pause => Self::Pause,
KeyCode::Menu => Self::Menu,
KeyCode::KeypadBegin => Self::KeypadBegin,
// FIXME(@soispha): This reduces our information, casting a KeyCode to a KeyValue
// and back again would not equal the original KeyCode <2023-10-15>
KeyCode::Media(_) => Self::Null,
KeyCode::Modifier(_) => Self::Null,
}
}
}
impl Into<KeyCode> for KeyValue {
fn into(self) -> KeyCode {
match self {
Self::Backspace => KeyCode::Backspace,
Self::Enter => KeyCode::Enter,
Self::Left => KeyCode::Left,
Self::Right => KeyCode::Right,
Self::Up => KeyCode::Up,
Self::Down => KeyCode::Down,
Self::Home => KeyCode::Home,
Self::End => KeyCode::End,
Self::PageUp => KeyCode::PageUp,
Self::PageDown => KeyCode::PageDown,
Self::Tab => KeyCode::Tab,
Self::BackTab => KeyCode::BackTab,
Self::Delete => KeyCode::Delete,
Self::Insert => KeyCode::Insert,
Self::F(n) => KeyCode::F(n),
Self::Char(c) => KeyCode::Char(c),
Self::Null => KeyCode::Null,
Self::Esc => KeyCode::Esc,
Self::CapsLock => KeyCode::CapsLock,
Self::ScrollLock => KeyCode::ScrollLock,
Self::NumLock => KeyCode::NumLock,
Self::PrintScreen => KeyCode::PrintScreen,
Self::Pause => KeyCode::Pause,
Self::Menu => KeyCode::Menu,
Self::KeypadBegin => KeyCode::KeypadBegin,
}
}
}

123
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#[cfg(feature = "crossterm")]
mod crossterm;
use std::{
fmt::{Display, Write},
str::FromStr,
};
use crate::error;
// taken directly from crossterm
#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Clone, Copy)]
pub enum KeyValue {
Backspace,
Enter,
Left,
Right,
Up,
Down,
Home,
End,
PageUp,
PageDown,
Tab,
BackTab,
Delete,
Insert,
F(u8),
Char(char),
Null, // TODO(@soispha): Should we keep this key (as it's effectively not a key)?<2023-10-15>
Esc,
CapsLock,
ScrollLock,
NumLock,
PrintScreen,
Pause,
Menu,
KeypadBegin,
// TODO(@soispha): We could add support for these: <2023-10-15>
// Media(MediaKeyCode),
}
impl FromStr for KeyValue {
type Err = error::KeyValueParseError;
fn from_str(s: &str) -> Result<Self, Self::Err> {
match s {
"BACKSPACE" => Ok(Self::Backspace),
"ENTER" => Ok(Self::Enter),
"LEFT" => Ok(Self::Left),
"RIGHT" => Ok(Self::Right),
"UP" => Ok(Self::Up),
"DOWN" => Ok(Self::Down),
"HOME" => Ok(Self::Home),
"END" => Ok(Self::End),
"PAGEUP" => Ok(Self::PageUp),
"PAGEDOWN" => Ok(Self::PageDown),
"TAB" => Ok(Self::Tab),
"BACKTAB" => Ok(Self::BackTab),
"DELETE" => Ok(Self::Delete),
"INSERT" => Ok(Self::Insert),
"ESC" => Ok(Self::Esc),
"CAPSLOCK" => Ok(Self::CapsLock),
"SCROLLlOCK" => Ok(Self::ScrollLock),
"NUMLOCK" => Ok(Self::NumLock),
"PRINTSCREEN" => Ok(Self::PrintScreen),
"PAUSE" => Ok(Self::Pause),
"MENU" => Ok(Self::Menu),
"KEYPADBEGIN" => Ok(Self::KeypadBegin),
f_str
// FIXME(@soispha): This should check the full string, as something
// like 'FA12' would also match this case <2023-11-07>
if f_str.starts_with('F')
&& f_str.ends_with(['0', '1', '2', '3', '4', '5', '6', '7', '8', '9']) =>
{
Ok(Self::F(f_str.trim_matches('F').parse()?))
}
"DASH" => Ok(Self::Char('-')),
"ANGULAR_BRACKET_OPEN" | "ABO" => Ok(Self::Char('<')),
"ANGULAR_BRACKET_CLOSE" | "ABC" => Ok(Self::Char('>')),
other_str => Err(Self::Err::NoMatch(other_str.to_owned())),
}
}
}
impl Display for KeyValue {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
let mut w = |str| f.write_str(str);
match self {
KeyValue::Backspace => w("<BACKSPACE>"),
KeyValue::Enter => w("<ENTER>"),
KeyValue::Left => w("<LEFT>"),
KeyValue::Right => w("<RIGHT>"),
KeyValue::Up => w("<UP>"),
KeyValue::Down => w("<DOWN>"),
KeyValue::Home => w("<HOME>"),
KeyValue::End => w("<END>"),
KeyValue::PageUp => w("<PAGEUP>"),
KeyValue::PageDown => w("<PAGEDOWN>"),
KeyValue::Tab => w("<TAB>"),
KeyValue::BackTab => w("<BACKTAB>"),
KeyValue::Delete => w("<DELETE>"),
KeyValue::Insert => w("<INSERT>"),
KeyValue::F(n) => f.write_fmt(format_args!("<F{}>", n)),
KeyValue::Char(c) => match c {
'<' => w("<ANGULAR_BRACKET_OPEN>"),
'>' => w("<ANGULAR_BRACKET_CLOSE>"),
'-' => w("<DASH>"),
c => f.write_char(*c),
},
KeyValue::Null => w("<NULL>"),
KeyValue::Esc => w("<ESC>"),
KeyValue::CapsLock => w("<CAPSLOCK>"),
KeyValue::ScrollLock => w("<SCROLLLOCK>"),
KeyValue::NumLock => w("<NUMLOCK>"),
KeyValue::PrintScreen => w("<PRINTSCREEN>"),
KeyValue::Pause => w("<PAUSE>"),
KeyValue::Menu => w("<MENU>"),
KeyValue::KeypadBegin => w("<KEYPADBEGIN>"),
}
}
}

128
src/key_repr/keys/mod.rs Normal file
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use pest::Parser;
use pest_derive::Parser;
use crate::error;
use super::Key;
use std::{fmt::Display, str::FromStr};
#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Clone, Default, Parser)]
#[grammar = "./key_repr/key_representation.pest"]
pub struct Keys(pub(super) Vec<Key>);
impl Keys {
pub fn new(initial_value: Key) -> Self {
Keys(vec![initial_value])
}
pub fn join(&self, key: Key) -> Keys {
let mut output = self.0.clone();
output.push(key);
Keys(output)
}
}
pub struct KeysIter {
keys: Keys,
index: usize,
}
pub struct KeysIterB<'a> {
keys: &'a Keys,
index: usize,
}
impl IntoIterator for Keys {
type Item = Key;
type IntoIter = KeysIter;
fn into_iter(self) -> Self::IntoIter {
KeysIter {
keys: self,
index: 0,
}
}
}
impl Iterator for KeysIter {
type Item = Key;
fn next(&mut self) -> Option<Self::Item> {
let output = if self.keys.0.len() <= self.index {
None
} else {
Some(self.keys.0[self.index])
};
self.index += 1;
output
}
}
impl<'a> IntoIterator for &'a Keys {
type Item = &'a Key;
type IntoIter = KeysIterB<'a>;
fn into_iter(self) -> Self::IntoIter {
KeysIterB {
keys: self,
index: 0,
}
}
}
impl<'a> Iterator for KeysIterB<'a> {
type Item = &'a Key;
fn next(&mut self) -> Option<Self::Item> {
let output = self.keys.0.get(self.index);
self.index += 1;
output
}
}
impl Display for Keys {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
f.write_str(
&self
.into_iter()
.map(|key| key.to_string_repr())
.collect::<String>(),
)
}
}
impl FromStr for Keys {
type Err = error::KeysParseError;
fn from_str(s: &str) -> Result<Self, Self::Err> {
let mut output: Vec<Key> = vec![];
let parsed = Self::parse(Rule::keys, s)?;
let keys: Vec<_> = parsed.find_tagged("keys").collect();
for key in keys {
let output_key: Key = Key::from_pair(key);
output.push(output_key)
}
// let mut chars = Chars(s.chars().collect());
// while let Some(char) = chars.pop() {
// match char {
// '<' => {
// chars.prepend('<');
// let key = Key::parse(&mut chars)
// .with_context(|| format!("Failed to parse keymapping ('{}')", &chars))?;
// output.push(key)
// }
// other_char => output.push(Key {
// alt: false,
// ctrl: false,
// meta: false,
// shift: false,
// value: Some(KeyValue::Char(other_char)),
// }),
// }
// }
Ok(Keys(output))
}
}

189
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pub mod key;
pub mod key_value;
pub mod keys;
pub use key::Key;
pub use key_value::*;
pub use keys::Keys;
#[cfg(test)]
mod test {
use crate::key_repr::{Key, KeyValue};
use pretty_assertions::assert_eq;
use super::Keys;
// "<C-a>ba" => "Ctrl+a" && "b" && "a"
// "<S-a>" => "A" || "Shift+a"
// "A" => "A"
// "<M-a> " => "Alt+a" || "Super+a"
// "a<C-b><C-a>" => "a" && "Ctrl+b" && "Ctrl+a"
// "<CSM-b>" => "Ctrl+Shift+Alt+b"
// "a " => "a" && " "
// "å🙂" => "å" && "🙂"
// "<ESC>" => escape key
// "<BACKSPACE>" => backspace key (and so forth)
// "<DASH>" => "-"
// "<ANGULAR_BRACKET_OPEN>" || "<ABO>" => "<"
// "<ANGULAR_BRACKET_CLOSE>" || "<ABC>" => ">"
#[test]
fn test_simple() {
let keys: Keys = "<C-a>".parse().unwrap();
assert_eq!(
keys,
Keys(vec![Key {
alt: false,
ctrl: true,
meta: false,
shift: false,
value: Some(KeyValue::Char('a'))
}])
)
}
#[test]
fn test_shift_a() {
let keys: Keys = "<S-a>".parse().unwrap();
assert_eq!(
keys,
Keys(vec![Key {
alt: false,
ctrl: false,
meta: false,
shift: true,
value: Some(KeyValue::Char('a'))
}])
)
}
#[test]
fn test_string_repr() {
let key = Key {
alt: true,
ctrl: false,
meta: true,
shift: true,
value: Some(KeyValue::Up),
};
assert_eq!("<AMS-<UP>>".to_owned(), key.to_string_repr());
}
#[test]
fn test_string_repr_special() {
let key = Key {
alt: true,
ctrl: false,
meta: true,
shift: true,
value: Some(KeyValue::Char('<')),
};
assert_eq!(
"<AMS-<ANGULAR_BRACKET_OPEN>>".to_owned(),
key.to_string_repr()
);
}
#[test]
fn test_extra_special_keys() {
// The <C--> part works! Although we should probably not encourage it
let keys: Keys = "<C--><C-<DASH>><A-<ABO>><ABC>".parse().unwrap();
assert_eq!(
keys,
Keys(vec![
Key {
alt: false,
ctrl: true,
meta: false,
shift: false,
value: Some(KeyValue::Char('-'))
},
Key {
alt: false,
ctrl: true,
meta: false,
shift: false,
value: Some(KeyValue::Char('-'))
},
Key {
alt: true,
ctrl: false,
meta: false,
shift: false,
value: Some(KeyValue::Char('<'))
},
Key {
alt: false,
ctrl: false,
meta: false,
shift: false,
value: Some(KeyValue::Char('>'))
},
])
)
}
#[test]
fn test_false_pattern() {
let keys: Result<Keys, _> = "<c->".parse();
assert!(keys.is_err())
}
#[test]
fn test_f_keys() {
let key: Key = "<C-<F255>>".parse().unwrap();
let expected = Key {
alt: false,
ctrl: true,
meta: false,
shift: false,
value: Some(KeyValue::F(255)),
};
assert_eq!(key, expected);
}
#[test]
fn test_complex() {
let keys: Keys = "<C-a><ACMS-<ESC>>a 🙂"
.parse()
.unwrap_or_else(|e| panic!("{}", e));
assert_eq!(
keys,
Keys(vec![
Key {
alt: false,
ctrl: true,
meta: false,
shift: false,
value: Some(KeyValue::Char('a'))
},
Key {
alt: true,
ctrl: true,
meta: true,
shift: true,
value: Some(KeyValue::Esc)
},
Key {
alt: false,
ctrl: false,
meta: false,
shift: false,
value: Some(KeyValue::Char('a'))
},
Key {
alt: false,
ctrl: false,
meta: false,
shift: false,
value: Some(KeyValue::Char(' '))
},
Key {
alt: false,
ctrl: false,
meta: false,
shift: false,
value: Some(KeyValue::Char('🙂'))
},
])
)
}
}

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src/lib.rs Normal file
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pub mod key_repr;
pub mod trie;
pub mod error;

248
src/trie.rs Normal file
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use std::collections::HashMap;
use log::info;
use crate::error;
use super::key_repr::{Key, Keys};
#[derive(Debug, PartialEq, Eq)]
pub struct Node<V: std::fmt::Display + ToOwned<Owned = V>> {
children: HashMap<Key, Box<Node<V>>>,
value: Option<V>,
is_terminal: bool,
is_child: bool,
}
impl<V: std::fmt::Display + ToOwned<Owned = V>> Default for Node<V> {
fn default() -> Self {
Self::new()
}
}
impl<V: std::fmt::Display + ToOwned<Owned = V>> Node<V> {
pub fn new() -> Node<V> {
Node {
children: HashMap::new(),
is_terminal: true,
is_child: false,
value: None,
}
}
pub fn new_child() -> Node<V> {
Node {
children: HashMap::new(),
is_terminal: true,
is_child: true,
value: None,
}
}
pub fn is_terminal(&self) -> bool {
self.is_terminal
}
pub fn is_child(&self) -> bool {
self.is_child
}
/// Get a reference to a child value of this node by key, will return None if the key does not exist.
/// If the key does exists, but does not have any values associated with it, it will return an
/// empty vector
/// The boolean denotes if the returned node is a true end or just a waypoint. It should be
/// called, when the bool is true
pub fn get(&self, keys: &Keys) -> Option<(Vec<&Node<V>>, bool)> {
let mut current_node = self;
let mut old_node = None;
for char in keys {
// r
// |
// a
// / \
// b a
// |
// c
//
//
//
// r->a->a: Some([a]) -> a.is_child() && a.is_terminal() ? call a : *key input pending*
// r->a->b: Some([b]) -> b.is_child() && b.is_terminal() ? *call b* : key input pending
// r->a->c: None -> continue
// r->a->a->c: Some([c]) -> c.is_child() && c.is_terminal() ? *call c* : key input pending
//
// r->a: Some([a, b]) -> key input pending
if let Some(node) = current_node.children.get(char) {
old_node = Some((current_node, char));
current_node = node;
} else {
return None;
}
}
if current_node.is_child() && current_node.is_terminal() {
let (on, char) = old_node.expect("At this point, this should be Some");
info!("Returning calling node for char: '{}'", char);
Some((
vec![on
.children
.get(char)
.expect("This should be some, as this was checked above")],
true,
))
} else {
Some((
current_node.children.values().map(|a| a.as_ref()).collect(),
false,
))
}
}
/// Insert a key value pair into the trie. The key is supplied as a string to facilitate the
/// creation of nested nodes.
pub fn insert(&mut self, keys: &Keys, value: V) -> Result<(), error::TrieInsertError<V>> {
let mut current_node = self;
for char in keys {
let child_node = current_node
.children
.entry(char.to_owned())
.or_insert(Box::new(Node::new_child()));
if current_node.value.is_some() {
return Err(error::TrieInsertError::KeyPathBlocked(keys.to_owned()));
}
current_node.is_terminal = false;
current_node = child_node
}
if current_node.value.is_some() {
return Err(error::TrieInsertError::KeyAlreadySet {
key: keys.to_owned(),
value: current_node
.value
.as_ref()
.expect("This should be set")
.to_owned(),
});
} else if !current_node.children.is_empty() {
return Err(error::TrieInsertError::NodeHasChildren(keys.to_owned()));
} else {
current_node.value = Some(value);
Ok(())
}
}
/// Return the values from this node. If the node does not have a value associated with it,
/// return None
pub fn value(&self) -> Option<&V> {
self.value.as_ref()
}
/// Collect all values from this nodes children. Can be called recursively as it should be
/// tail-recursive.
pub fn collect_values_all(&self) -> Vec<&V> {
if self.is_terminal && self.is_child {
vec![self.value.as_ref().expect("We checked above")]
} else {
let out: Vec<_> = self
.children
.values()
.flat_map(|node| node.collect_values_all())
.collect();
out
}
}
}
#[cfg(test)]
mod test {
use crate::key_repr::{Key, Keys};
use pretty_assertions::assert_eq;
use super::Node;
fn i(str: &str) -> Keys {
str.parse().unwrap()
}
fn k(str: &str) -> Key {
str.parse::<Key>().unwrap()
}
fn collect<V: std::fmt::Display + ToOwned<Owned = V>>(
nodes: Option<(Vec<&Node<V>>, bool)>,
) -> Vec<&V> {
let (nodes, _should_call) = nodes.unwrap();
nodes
.iter()
.map(|node| node.value())
.filter_map(|x| x)
.collect()
}
#[test]
fn test_empty_values() {
let trie: Node<bool> = Node::new();
assert_eq!(trie.collect_values_all(), Vec::<&bool>::new());
}
#[test]
fn test_insert() {
let mut trie: Node<bool> = Node::new();
trie.insert(&i("abc"), true).unwrap();
trie.insert(&i("abd"), true).unwrap();
trie.insert(&i("aca"), false).unwrap();
let output: Vec<&bool> = vec![&true, &true];
let get_output: Vec<_> = collect(trie.get(&i("ab")));
assert_eq!(get_output, output);
}
#[test]
fn test_duplicate_insert() {
let mut trie: Node<bool> = Node::new();
trie.insert(&i("abc"), true).unwrap();
trie.insert(&i("aca"), true).unwrap();
let output = trie.insert(&i("ab"), false);
dbg!(&trie);
assert!(output.is_err());
}
#[test]
fn test_multiple_get() {
// | | | | |
// a <- Input 1st a | q | i
// / \ | |
// b a <- Input 2nd a | |
// / \ | |
// d e
let mut trie: Node<bool> = Node::new();
let mut output: Node<bool> = Node::new();
trie.insert(&i("aa"), true).unwrap();
trie.insert(&i("abe"), true).unwrap();
trie.insert(&i("abd"), true).unwrap();
output.insert(&i("abd"), true).unwrap();
output.insert(&i("abe"), true).unwrap();
output.insert(&i("aa"), true).unwrap();
output.insert(&i("acd"), true).unwrap();
output.insert(&i("ace"), true).unwrap();
let a_children = &output.children.get(&k("a")).unwrap();
let output_nodes = vec![
a_children.children[&k("a")].as_ref(),
a_children.children[&k("b")].as_ref(),
];
let (nodes, _should_call) = trie.get(&i("a")).unwrap();
assert_eq!(nodes, output_nodes);
}
#[test]
fn test_wrong_get() {
let mut trie: Node<bool> = Node::new();
trie.insert(&i("abc"), true).unwrap();
trie.insert(&i("abd"), true).unwrap();
trie.insert(&i("aca"), false).unwrap();
assert!(trie.get(&i("bb")).is_none());
}
}