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/target
/classes
/checkouts
profiles.clj
pom.xml
pom.xml.asc
*.jar
*.class
/lib/
/classes/
/target/
/checkouts/
.lein-deps-sum
.lein-repl-history
.lein-plugins/
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.nrepl-port
.cpcache/
.clj-kondo/
/.lein-*
/.nrepl-port
/.prepl-port
.hgignore
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.clj-condo/
.calva/
.lsp/
.clj-kondo/
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**/.DS_Store

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# Change Log
All notable changes to this project will be documented in this file. This change log follows the conventions of [keepachangelog.com](http://keepachangelog.com/).
## [Unreleased]
### Changed
- Add a new arity to `make-widget-async` to provide a different widget shape.
## [0.1.1] - 2021-10-23
### Changed
- Documentation on how to make the widgets.
### Removed
- `make-widget-sync` - we're all async, all the time.
### Fixed
- Fixed widget maker to keep working when daylight savings switches over.
## 0.1.0 - 2021-10-23
### Added
- Files from the new template.
- Widget maker public API - `make-widget-sync`.
[Unreleased]: https://sourcehost.site/your-name/cludus/compare/0.1.1...HEAD
[0.1.1]: https://sourcehost.site/your-name/cludus/compare/0.1.0...0.1.1

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22
README.md
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@ -1,2 +1,22 @@
# cludus
A cljs-based tree-walk reference interpreter for Ludus
A Clojure library designed to ... well, that part is up to you.
## Usage
FIXME
## License
Copyright © 2021 FIXME
This program and the accompanying materials are made available under the
terms of the Eclipse Public License 2.0 which is available at
http://www.eclipse.org/legal/epl-2.0.
This Source Code may also be made available under the following Secondary
Licenses when the conditions for such availability set forth in the Eclipse
Public License, v. 2.0 are satisfied: GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or (at your
option) any later version, with the GNU Classpath Exception which is available
at https://www.gnu.org/software/classpath/license.html.

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# Introduction to cludus
TODO: write [great documentation](http://jacobian.org/writing/what-to-write/)

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project.clj Normal file
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(defproject ludus "0.1.0-SNAPSHOT"
:description "FIXME: write description"
:url "http://example.com/FIXME"
:license {:name "EPL-2.0 OR GPL-2.0-or-later WITH Classpath-exception-2.0"
:url "https://www.eclipse.org/legal/epl-2.0/"}
:dependencies [[org.clojure/clojure "1.10.3"]]
:repl-options {:init-ns ludus.core}
:main ludus.core)

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src/ludus/core.clj Normal file
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(ns ludus.core
"A tree-walk interpreter for the Ludus language."
(:require
[ludus.scanner :as scanner]))
(defn- report [line, where, message]
(println (str "[line " line "] Error" where ": " message)))
(defn- error [line, message]
(report line "" message))
(defn- run [source]
(let [tokens (scanner/scan source)]
(run! println tokens)))
(defn- run-file [path]
(let [source (slurp path)]
(run source)))
(defn- run-prompt []
(loop [_ ""]
(print "Ludus >> ")
(flush)
(when-let [line (read-line)]
(recur (run line)))))
(defn -main [& args]
(cond
(> (count args) 1) (do
(println "Usage: ludus [script]")
(System/exit 64))
(= (count args) 1) (run-file (first args))
:else (run-prompt)))

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src/ludus/core.cljs
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(ns ludus.core)
(.log js/console "Hello, world!")

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src/ludus/scanner.clj Normal file
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(ns ludus.scanner
(:require [ludus.token :as token]))
(def reserved-words
"List of Ludus reserved words."
#{"fn"
"if"
"then"
"else"
"nil"
"match"
"with"
"true"
"false"
"as"
"ref"
"swap"
;; other possibilities
;; "pattern" -- first class patterns?
})
(defn- new-scanner [source]
{::source source
::length (count source)
::errors []
::start 0
::current 0
::line 1
::tokens []})
(defn- at-end? [scanner]
(>= (::current scanner) (::length scanner)))
(defn- current-char [scanner]
(nth (::source scanner) (::current scanner)))
(defn- advance [scanner]
(update scanner ::current inc))
(defn- current-lexeme [scanner]
(subs (::source scanner) (::start scanner) (::current scanner)))
(defn- char-in-range? [start end char]
(and char
(>= (int char) (int start))
(<= (int char) (int end))))
(defn- digit? [c]
(char-in-range? \0 \9 c))
(defn- nonzero-digit? [c]
(char-in-range? \1 \9 c))
(defn- alpha? [c]
(boolean (re-find #"\p{L}" (str c))))
;; Note that commas are whitespace in Ludus
(defn- whitespace? [c]
(or (= c \space) (= c \tab) (= c \return) (= c \,)))
(defn- terminates? [c]
(or (whitespace? c) (= c \:) (= c \newline)))
(defn- add-token
([scanner token-type]
(add-token scanner token-type nil))
([scanner token-type literal]
(update scanner ::tokens conj (token/token token-type (current-lexeme scanner) literal (::line scanner)))))
(defn- add-number [scanner])
(defn- add-string [scanner])
(defn- scan-token [scanner]
(let [char (current-char scanner)
scanner (advance scanner)]
(case char
;; one-character tokens
\( (add-token scanner ::token/lparen)
\) (add-token scanner ::token/rparen)
\{ (add-token scanner ::token/lbrace)
\} (add-token scanner ::token/rbrace)
\[ (add-token scanner ::token/lbracket)
\] (add-token scanner ::token/rbracket)
\; (add-token scanner ::token/semicolon)
\newline (add-token scanner ::token/newline)
;; two-character tokens
;; ->
;; <-
;; //
;; begin hashmap #{
;; begin set ${
;; keywords
;;\: (add-keyword scanner)
;; strings
;;\"
;; word matches
(comment (cond
(digit? char) (add-number scanner)
(alpha? char) (add-word scanner)
(= \_ char) (add-placeholder scanner)
:else (add-error scanner (str "Unexpected character: " char)))))))
(defn- next-token [scanner]
(assoc scanner ::start (::current scanner)))
(defn scan [source]
(loop [scanner (new-scanner source)]
(if (at-end? scanner)
(let [scanner (add-token scanner ::eof)]
[(::tokens scanner) (::errors scanner)])
(recur (-> scanner (scan-token) (next-token))))))

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src/ludus/token.clj Normal file
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(ns ludus.token)
(defn token
([type text]
(token type text nil 1))
([type text literal line]
{::type type
::lexeme text
::literal literal
::line line}))
(defn from-keyword [kw]
(keyword "ludus.token" kw))

7
test/cludus/core_test.clj Normal file
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(ns cludus.core-test
(:require [clojure.test :refer :all]
[cludus.core :refer :all]))
(deftest a-test
(testing "FIXME, I fail."
(is (= 0 1))))