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Repository: vishpat/lisp-rs
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gitextract_y9aowojs/
├── .gitignore
├── .rustfmt.toml
├── Cargo.toml
├── LICENSE
├── README.md
├── docs/
│ ├── .nojekyll
│ ├── 404.html
│ ├── FontAwesome/
│ │ └── css/
│ │ └── font-awesome.css
│ ├── ayu-highlight.css
│ ├── book.js
│ ├── css/
│ │ ├── chrome.css
│ │ ├── general.css
│ │ ├── print.css
│ │ └── variables.css
│ ├── evaluator.html
│ ├── fonts/
│ │ ├── OPEN-SANS-LICENSE.txt
│ │ ├── SOURCE-CODE-PRO-LICENSE.txt
│ │ └── fonts.css
│ ├── highlight.css
│ ├── highlight.js
│ ├── index.html
│ ├── introduction.html
│ ├── lexer.html
│ ├── next.html
│ ├── overview.html
│ ├── parser.html
│ ├── print.html
│ ├── repl.html
│ ├── searcher.js
│ ├── searchindex.js
│ ├── searchindex.json
│ └── tomorrow-night.css
└── src/
├── env.rs
├── eval.rs
├── lexer.rs
├── lib.rs
├── main.rs
├── object.rs
└── parser.rs
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FILE CONTENTS
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FILE: .gitignore
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/target
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FILE: .rustfmt.toml
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max_width=60
tab_spaces=2
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FILE: Cargo.toml
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[package]
name = "lisp-rs"
version = "0.3.5"
edition = "2021"
license = "MIT"
homepage = "https://vishpat.github.io/lisp-rs"
repository = "https://github.com/vishpat/lisp-rs"
documentation = "https://vishpat.github.io/lisp-rs"
description = """
Lisp interpreter in Rust
"""
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
linefeed = {version = "0.6.0", optional = true }
[features]
build-binary = ["linefeed"]
[lib]
name = "lisp_rs"
path = "src/lib.rs"
[[bin]]
name = "lisp-rs"
path = "src/main.rs"
required-features = ["build-binary"]
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FILE: LICENSE
================================================
MIT License
Copyright (c) 2022 Vishal Patil
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
================================================
FILE: README.md
================================================
# lisp-rs
A simple Lisp interpreter/library in Rust. The interpreter/library was initially developed as a **teaching aid** to explain how [Lisp interpreters work](https://www.amazon.com/dp/B0DS8XJJWY/ref=tmm_pap_swatch_0?_encoding=UTF8&qid=&sr=) and how can they be implemented using the Rust programming language. However the interpreter seems to be taking life of it's own and has been ported to the [web](https://vishpat.github.io/lisp-rs-wasm) using [WASM](https://webassembly.org). The interpreter is available as a [crate](https://crates.io/crates/lisp-rs) and can be used to embed a Lisp interpreter in your Rust projects. The WASM implementation uses the lisp-rs as a library to implement the online interpreter.
## Dialect
The interpreter is based on a modified subset of [Scheme](https://en.wikipedia.org/wiki/Scheme_(programming_language)). Following are the features supported by the interpreter
- Variables and Constants
- Functions (lambdas)
- Functional constructs such as map, filter and reduce
- Closures
- Tail Call Optimization
More information about the dialect can be found at
- [Syntax](https://github.com/vishpat/lisp-rs/wiki/Lisp-Syntax)
- [Sample Programs](https://github.com/vishpat/lisp-rs/wiki/Sample-programs)
## Implementation
For a detailed code-walkthrough about evaluator refer to the [docs](https://vishpat.github.io/lisp-rs). For code-walkthrough of all the phases, get the [book](
https://www.amazon.com/dp/B0DS8XJJWY/ref=tmm_pap_swatch_0?_encoding=UTF8&qid=&sr=).
[](https://asciinema.org/a/VVQQfGpp15a4BaoNgnEKIqqrr)
## REPL
```
cargo run --features="build-binary"
```
## Test
```
cargo test
```
## WASM
The interpreter has also been compiled to WASM so that it can run in a browser and is hosted [here](https://vishpat.github.io/lisp-rs-wasm).
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FILE: docs/ayu-highlight.css
================================================
/*
Based off of the Ayu theme
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================================================
FILE: docs/book.js
================================================
"use strict";
// Fix back button cache problem
window.onunload = function () { };
// Global variable, shared between modules
function playground_text(playground) {
let code_block = playground.querySelector("code");
if (window.ace && code_block.classList.contains("editable")) {
let editor = window.ace.edit(code_block);
return editor.getValue();
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function fetch_with_timeout(url, options, timeout = 6000) {
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var playgrounds = Array.from(document.querySelectorAll(".playground"));
if (playgrounds.length > 0) {
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headers: {
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.then(response => {
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let playground_crates = response.crates.map(item => item["id"]);
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update_play_button(playground_block, playground_crates);
});
// add Ctrl-Enter command to execute rust code
editor.commands.addCommand({
name: "run",
bindKey: {
win: "Ctrl-Enter",
mac: "Ctrl-Enter"
},
exec: _editor => run_rust_code(playground_block)
});
}
}
}
// updates the visibility of play button based on `no_run` class and
// used crates vs ones available on http://play.rust-lang.org
function update_play_button(pre_block, playground_crates) {
var play_button = pre_block.querySelector(".play-button");
// skip if code is `no_run`
if (pre_block.querySelector('code').classList.contains("no_run")) {
play_button.classList.add("hidden");
return;
}
// get list of `extern crate`'s from snippet
var txt = playground_text(pre_block);
var re = /extern\s+crate\s+([a-zA-Z_0-9]+)\s*;/g;
var snippet_crates = [];
var item;
while (item = re.exec(txt)) {
snippet_crates.push(item[1]);
}
// check if all used crates are available on play.rust-lang.org
var all_available = snippet_crates.every(function (elem) {
return playground_crates.indexOf(elem) > -1;
});
if (all_available) {
play_button.classList.remove("hidden");
} else {
play_button.classList.add("hidden");
}
}
function run_rust_code(code_block) {
var result_block = code_block.querySelector(".result");
if (!result_block) {
result_block = document.createElement('code');
result_block.className = 'result hljs language-bash';
code_block.append(result_block);
}
let text = playground_text(code_block);
let classes = code_block.querySelector('code').classList;
let edition = "2015";
if(classes.contains("edition2018")) {
edition = "2018";
} else if(classes.contains("edition2021")) {
edition = "2021";
}
var params = {
version: "stable",
optimize: "0",
code: text,
edition: edition
};
if (text.indexOf("#![feature") !== -1) {
params.version = "nightly";
}
result_block.innerText = "Running...";
fetch_with_timeout("https://play.rust-lang.org/evaluate.json", {
headers: {
'Content-Type': "application/json",
},
method: 'POST',
mode: 'cors',
body: JSON.stringify(params)
})
.then(response => response.json())
.then(response => {
if (response.result.trim() === '') {
result_block.innerText = "No output";
result_block.classList.add("result-no-output");
} else {
result_block.innerText = response.result;
result_block.classList.remove("result-no-output");
}
})
.catch(error => result_block.innerText = "Playground Communication: " + error.message);
}
// Syntax highlighting Configuration
hljs.configure({
tabReplace: ' ', // 4 spaces
languages: [], // Languages used for auto-detection
});
let code_nodes = Array
.from(document.querySelectorAll('code'))
// Don't highlight `inline code` blocks in headers.
.filter(function (node) {return !node.parentElement.classList.contains("header"); });
if (window.ace) {
// language-rust class needs to be removed for editable
// blocks or highlightjs will capture events
code_nodes
.filter(function (node) {return node.classList.contains("editable"); })
.forEach(function (block) { block.classList.remove('language-rust'); });
Array
code_nodes
.filter(function (node) {return !node.classList.contains("editable"); })
.forEach(function (block) { hljs.highlightBlock(block); });
} else {
code_nodes.forEach(function (block) { hljs.highlightBlock(block); });
}
// Adding the hljs class gives code blocks the color css
// even if highlighting doesn't apply
code_nodes.forEach(function (block) { block.classList.add('hljs'); });
Array.from(document.querySelectorAll("code.language-rust")).forEach(function (block) {
var lines = Array.from(block.querySelectorAll('.boring'));
// If no lines were hidden, return
if (!lines.length) { return; }
block.classList.add("hide-boring");
var buttons = document.createElement('div');
buttons.className = 'buttons';
buttons.innerHTML = "<button class=\"fa fa-eye\" title=\"Show hidden lines\" aria-label=\"Show hidden lines\"></button>";
// add expand button
var pre_block = block.parentNode;
pre_block.insertBefore(buttons, pre_block.firstChild);
pre_block.querySelector('.buttons').addEventListener('click', function (e) {
if (e.target.classList.contains('fa-eye')) {
e.target.classList.remove('fa-eye');
e.target.classList.add('fa-eye-slash');
e.target.title = 'Hide lines';
e.target.setAttribute('aria-label', e.target.title);
block.classList.remove('hide-boring');
} else if (e.target.classList.contains('fa-eye-slash')) {
e.target.classList.remove('fa-eye-slash');
e.target.classList.add('fa-eye');
e.target.title = 'Show hidden lines';
e.target.setAttribute('aria-label', e.target.title);
block.classList.add('hide-boring');
}
});
});
if (window.playground_copyable) {
Array.from(document.querySelectorAll('pre code')).forEach(function (block) {
var pre_block = block.parentNode;
if (!pre_block.classList.contains('playground')) {
var buttons = pre_block.querySelector(".buttons");
if (!buttons) {
buttons = document.createElement('div');
buttons.className = 'buttons';
pre_block.insertBefore(buttons, pre_block.firstChild);
}
var clipButton = document.createElement('button');
clipButton.className = 'fa fa-copy clip-button';
clipButton.title = 'Copy to clipboard';
clipButton.setAttribute('aria-label', clipButton.title);
clipButton.innerHTML = '<i class=\"tooltiptext\"></i>';
buttons.insertBefore(clipButton, buttons.firstChild);
}
});
}
// Process playground code blocks
Array.from(document.querySelectorAll(".playground")).forEach(function (pre_block) {
// Add play button
var buttons = pre_block.querySelector(".buttons");
if (!buttons) {
buttons = document.createElement('div');
buttons.className = 'buttons';
pre_block.insertBefore(buttons, pre_block.firstChild);
}
var runCodeButton = document.createElement('button');
runCodeButton.className = 'fa fa-play play-button';
runCodeButton.hidden = true;
runCodeButton.title = 'Run this code';
runCodeButton.setAttribute('aria-label', runCodeButton.title);
buttons.insertBefore(runCodeButton, buttons.firstChild);
runCodeButton.addEventListener('click', function (e) {
run_rust_code(pre_block);
});
if (window.playground_copyable) {
var copyCodeClipboardButton = document.createElement('button');
copyCodeClipboardButton.className = 'fa fa-copy clip-button';
copyCodeClipboardButton.innerHTML = '<i class="tooltiptext"></i>';
copyCodeClipboardButton.title = 'Copy to clipboard';
copyCodeClipboardButton.setAttribute('aria-label', copyCodeClipboardButton.title);
buttons.insertBefore(copyCodeClipboardButton, buttons.firstChild);
}
let code_block = pre_block.querySelector("code");
if (window.ace && code_block.classList.contains("editable")) {
var undoChangesButton = document.createElement('button');
undoChangesButton.className = 'fa fa-history reset-button';
undoChangesButton.title = 'Undo changes';
undoChangesButton.setAttribute('aria-label', undoChangesButton.title);
buttons.insertBefore(undoChangesButton, buttons.firstChild);
undoChangesButton.addEventListener('click', function () {
let editor = window.ace.edit(code_block);
editor.setValue(editor.originalCode);
editor.clearSelection();
});
}
});
})();
(function themes() {
var html = document.querySelector('html');
var themeToggleButton = document.getElementById('theme-toggle');
var themePopup = document.getElementById('theme-list');
var themeColorMetaTag = document.querySelector('meta[name="theme-color"]');
var stylesheets = {
ayuHighlight: document.querySelector("[href$='ayu-highlight.css']"),
tomorrowNight: document.querySelector("[href$='tomorrow-night.css']"),
highlight: document.querySelector("[href$='highlight.css']"),
};
function showThemes() {
themePopup.style.display = 'block';
themeToggleButton.setAttribute('aria-expanded', true);
themePopup.querySelector("button#" + get_theme()).focus();
}
function hideThemes() {
themePopup.style.display = 'none';
themeToggleButton.setAttribute('aria-expanded', false);
themeToggleButton.focus();
}
function get_theme() {
var theme;
try { theme = localStorage.getItem('mdbook-theme'); } catch (e) { }
if (theme === null || theme === undefined) {
return default_theme;
} else {
return theme;
}
}
function set_theme(theme, store = true) {
let ace_theme;
if (theme == 'coal' || theme == 'navy') {
stylesheets.ayuHighlight.disabled = true;
stylesheets.tomorrowNight.disabled = false;
stylesheets.highlight.disabled = true;
ace_theme = "ace/theme/tomorrow_night";
} else if (theme == 'ayu') {
stylesheets.ayuHighlight.disabled = false;
stylesheets.tomorrowNight.disabled = true;
stylesheets.highlight.disabled = true;
ace_theme = "ace/theme/tomorrow_night";
} else {
stylesheets.ayuHighlight.disabled = true;
stylesheets.tomorrowNight.disabled = true;
stylesheets.highlight.disabled = false;
ace_theme = "ace/theme/dawn";
}
setTimeout(function () {
themeColorMetaTag.content = getComputedStyle(document.body).backgroundColor;
}, 1);
if (window.ace && window.editors) {
window.editors.forEach(function (editor) {
editor.setTheme(ace_theme);
});
}
var previousTheme = get_theme();
if (store) {
try { localStorage.setItem('mdbook-theme', theme); } catch (e) { }
}
html.classList.remove(previousTheme);
html.classList.add(theme);
}
// Set theme
var theme = get_theme();
set_theme(theme, false);
themeToggleButton.addEventListener('click', function () {
if (themePopup.style.display === 'block') {
hideThemes();
} else {
showThemes();
}
});
themePopup.addEventListener('click', function (e) {
var theme;
if (e.target.className === "theme") {
theme = e.target.id;
} else if (e.target.parentElement.className === "theme") {
theme = e.target.parentElement.id;
} else {
return;
}
set_theme(theme);
});
themePopup.addEventListener('focusout', function(e) {
// e.relatedTarget is null in Safari and Firefox on macOS (see workaround below)
if (!!e.relatedTarget && !themeToggleButton.contains(e.relatedTarget) && !themePopup.contains(e.relatedTarget)) {
hideThemes();
}
});
// Should not be needed, but it works around an issue on macOS & iOS: https://github.com/rust-lang/mdBook/issues/628
document.addEventListener('click', function(e) {
if (themePopup.style.display === 'block' && !themeToggleButton.contains(e.target) && !themePopup.contains(e.target)) {
hideThemes();
}
});
document.addEventListener('keydown', function (e) {
if (e.altKey || e.ctrlKey || e.metaKey || e.shiftKey) { return; }
if (!themePopup.contains(e.target)) { return; }
switch (e.key) {
case 'Escape':
e.preventDefault();
hideThemes();
break;
case 'ArrowUp':
e.preventDefault();
var li = document.activeElement.parentElement;
if (li && li.previousElementSibling) {
li.previousElementSibling.querySelector('button').focus();
}
break;
case 'ArrowDown':
e.preventDefault();
var li = document.activeElement.parentElement;
if (li && li.nextElementSibling) {
li.nextElementSibling.querySelector('button').focus();
}
break;
case 'Home':
e.preventDefault();
themePopup.querySelector('li:first-child button').focus();
break;
case 'End':
e.preventDefault();
themePopup.querySelector('li:last-child button').focus();
break;
}
});
})();
(function sidebar() {
var html = document.querySelector("html");
var sidebar = document.getElementById("sidebar");
var sidebarLinks = document.querySelectorAll('#sidebar a');
var sidebarToggleButton = document.getElementById("sidebar-toggle");
var sidebarResizeHandle = document.getElementById("sidebar-resize-handle");
var firstContact = null;
function showSidebar() {
html.classList.remove('sidebar-hidden')
html.classList.add('sidebar-visible');
Array.from(sidebarLinks).forEach(function (link) {
link.setAttribute('tabIndex', 0);
});
sidebarToggleButton.setAttribute('aria-expanded', true);
sidebar.setAttribute('aria-hidden', false);
try { localStorage.setItem('mdbook-sidebar', 'visible'); } catch (e) { }
}
var sidebarAnchorToggles = document.querySelectorAll('#sidebar a.toggle');
function toggleSection(ev) {
ev.currentTarget.parentElement.classList.toggle('expanded');
}
Array.from(sidebarAnchorToggles).forEach(function (el) {
el.addEventListener('click', toggleSection);
});
function hideSidebar() {
html.classList.remove('sidebar-visible')
html.classList.add('sidebar-hidden');
Array.from(sidebarLinks).forEach(function (link) {
link.setAttribute('tabIndex', -1);
});
sidebarToggleButton.setAttribute('aria-expanded', false);
sidebar.setAttribute('aria-hidden', true);
try { localStorage.setItem('mdbook-sidebar', 'hidden'); } catch (e) { }
}
// Toggle sidebar
sidebarToggleButton.addEventListener('click', function sidebarToggle() {
if (html.classList.contains("sidebar-hidden")) {
var current_width = parseInt(
document.documentElement.style.getPropertyValue('--sidebar-width'), 10);
if (current_width < 150) {
document.documentElement.style.setProperty('--sidebar-width', '150px');
}
showSidebar();
} else if (html.classList.contains("sidebar-visible")) {
hideSidebar();
} else {
if (getComputedStyle(sidebar)['transform'] === 'none') {
hideSidebar();
} else {
showSidebar();
}
}
});
sidebarResizeHandle.addEventListener('mousedown', initResize, false);
function initResize(e) {
window.addEventListener('mousemove', resize, false);
window.addEventListener('mouseup', stopResize, false);
html.classList.add('sidebar-resizing');
}
function resize(e) {
var pos = (e.clientX - sidebar.offsetLeft);
if (pos < 20) {
hideSidebar();
} else {
if (html.classList.contains("sidebar-hidden")) {
showSidebar();
}
pos = Math.min(pos, window.innerWidth - 100);
document.documentElement.style.setProperty('--sidebar-width', pos + 'px');
}
}
//on mouseup remove windows functions mousemove & mouseup
function stopResize(e) {
html.classList.remove('sidebar-resizing');
window.removeEventListener('mousemove', resize, false);
window.removeEventListener('mouseup', stopResize, false);
}
document.addEventListener('touchstart', function (e) {
firstContact = {
x: e.touches[0].clientX,
time: Date.now()
};
}, { passive: true });
document.addEventListener('touchmove', function (e) {
if (!firstContact)
return;
var curX = e.touches[0].clientX;
var xDiff = curX - firstContact.x,
tDiff = Date.now() - firstContact.time;
if (tDiff < 250 && Math.abs(xDiff) >= 150) {
if (xDiff >= 0 && firstContact.x < Math.min(document.body.clientWidth * 0.25, 300))
showSidebar();
else if (xDiff < 0 && curX < 300)
hideSidebar();
firstContact = null;
}
}, { passive: true });
// Scroll sidebar to current active section
var activeSection = document.getElementById("sidebar").querySelector(".active");
if (activeSection) {
// https://developer.mozilla.org/en-US/docs/Web/API/Element/scrollIntoView
activeSection.scrollIntoView({ block: 'center' });
}
})();
(function chapterNavigation() {
document.addEventListener('keydown', function (e) {
if (e.altKey || e.ctrlKey || e.metaKey || e.shiftKey) { return; }
if (window.search && window.search.hasFocus()) { return; }
switch (e.key) {
case 'ArrowRight':
e.preventDefault();
var nextButton = document.querySelector('.nav-chapters.next');
if (nextButton) {
window.location.href = nextButton.href;
}
break;
case 'ArrowLeft':
e.preventDefault();
var previousButton = document.querySelector('.nav-chapters.previous');
if (previousButton) {
window.location.href = previousButton.href;
}
break;
}
});
})();
(function clipboard() {
var clipButtons = document.querySelectorAll('.clip-button');
function hideTooltip(elem) {
elem.firstChild.innerText = "";
elem.className = 'fa fa-copy clip-button';
}
function showTooltip(elem, msg) {
elem.firstChild.innerText = msg;
elem.className = 'fa fa-copy tooltipped';
}
var clipboardSnippets = new ClipboardJS('.clip-button', {
text: function (trigger) {
hideTooltip(trigger);
let playground = trigger.closest("pre");
return playground_text(playground);
}
});
Array.from(clipButtons).forEach(function (clipButton) {
clipButton.addEventListener('mouseout', function (e) {
hideTooltip(e.currentTarget);
});
});
clipboardSnippets.on('success', function (e) {
e.clearSelection();
showTooltip(e.trigger, "Copied!");
});
clipboardSnippets.on('error', function (e) {
showTooltip(e.trigger, "Clipboard error!");
});
})();
(function scrollToTop () {
var menuTitle = document.querySelector('.menu-title');
menuTitle.addEventListener('click', function () {
document.scrollingElement.scrollTo({ top: 0, behavior: 'smooth' });
});
})();
(function controllMenu() {
var menu = document.getElementById('menu-bar');
(function controllPosition() {
var scrollTop = document.scrollingElement.scrollTop;
var prevScrollTop = scrollTop;
var minMenuY = -menu.clientHeight - 50;
// When the script loads, the page can be at any scroll (e.g. if you reforesh it).
menu.style.top = scrollTop + 'px';
// Same as parseInt(menu.style.top.slice(0, -2), but faster
var topCache = menu.style.top.slice(0, -2);
menu.classList.remove('sticky');
var stickyCache = false; // Same as menu.classList.contains('sticky'), but faster
document.addEventListener('scroll', function () {
scrollTop = Math.max(document.scrollingElement.scrollTop, 0);
// `null` means that it doesn't need to be updated
var nextSticky = null;
var nextTop = null;
var scrollDown = scrollTop > prevScrollTop;
var menuPosAbsoluteY = topCache - scrollTop;
if (scrollDown) {
nextSticky = false;
if (menuPosAbsoluteY > 0) {
nextTop = prevScrollTop;
}
} else {
if (menuPosAbsoluteY > 0) {
nextSticky = true;
} else if (menuPosAbsoluteY < minMenuY) {
nextTop = prevScrollTop + minMenuY;
}
}
if (nextSticky === true && stickyCache === false) {
menu.classList.add('sticky');
stickyCache = true;
} else if (nextSticky === false && stickyCache === true) {
menu.classList.remove('sticky');
stickyCache = false;
}
if (nextTop !== null) {
menu.style.top = nextTop + 'px';
topCache = nextTop;
}
prevScrollTop = scrollTop;
}, { passive: true });
})();
(function controllBorder() {
menu.classList.remove('bordered');
document.addEventListener('scroll', function () {
if (menu.offsetTop === 0) {
menu.classList.remove('bordered');
} else {
menu.classList.add('bordered');
}
}, { passive: true });
})();
})();
================================================
FILE: docs/css/chrome.css
================================================
/* CSS for UI elements (a.k.a. chrome) */
@import 'variables.css';
::-webkit-scrollbar {
background: var(--bg);
}
::-webkit-scrollbar-thumb {
background: var(--scrollbar);
}
html {
scrollbar-color: var(--scrollbar) var(--bg);
}
#searchresults a,
.content a:link,
a:visited,
a > .hljs {
color: var(--links);
}
/* Menu Bar */
#menu-bar,
#menu-bar-hover-placeholder {
z-index: 101;
margin: auto calc(0px - var(--page-padding));
}
#menu-bar {
position: relative;
display: flex;
flex-wrap: wrap;
background-color: var(--bg);
border-bottom-color: var(--bg);
border-bottom-width: 1px;
border-bottom-style: solid;
}
#menu-bar.sticky,
.js #menu-bar-hover-placeholder:hover + #menu-bar,
.js #menu-bar:hover,
.js.sidebar-visible #menu-bar {
position: -webkit-sticky;
position: sticky;
top: 0 !important;
}
#menu-bar-hover-placeholder {
position: sticky;
position: -webkit-sticky;
top: 0;
height: var(--menu-bar-height);
}
#menu-bar.bordered {
border-bottom-color: var(--table-border-color);
}
#menu-bar i, #menu-bar .icon-button {
position: relative;
padding: 0 8px;
z-index: 10;
line-height: var(--menu-bar-height);
cursor: pointer;
transition: color 0.5s;
}
@media only screen and (max-width: 420px) {
#menu-bar i, #menu-bar .icon-button {
padding: 0 5px;
}
}
.icon-button {
border: none;
background: none;
padding: 0;
color: inherit;
}
.icon-button i {
margin: 0;
}
.right-buttons {
margin: 0 15px;
}
.right-buttons a {
text-decoration: none;
}
.left-buttons {
display: flex;
margin: 0 5px;
}
.no-js .left-buttons {
display: none;
}
.menu-title {
display: inline-block;
font-weight: 200;
font-size: 2.4rem;
line-height: var(--menu-bar-height);
text-align: center;
margin: 0;
flex: 1;
white-space: nowrap;
overflow: hidden;
text-overflow: ellipsis;
}
.js .menu-title {
cursor: pointer;
}
.menu-bar,
.menu-bar:visited,
.nav-chapters,
.nav-chapters:visited,
.mobile-nav-chapters,
.mobile-nav-chapters:visited,
.menu-bar .icon-button,
.menu-bar a i {
color: var(--icons);
}
.menu-bar i:hover,
.menu-bar .icon-button:hover,
.nav-chapters:hover,
.mobile-nav-chapters i:hover {
color: var(--icons-hover);
}
/* Nav Icons */
.nav-chapters {
font-size: 2.5em;
text-align: center;
text-decoration: none;
position: fixed;
top: 0;
bottom: 0;
margin: 0;
max-width: 150px;
min-width: 90px;
display: flex;
justify-content: center;
align-content: center;
flex-direction: column;
transition: color 0.5s, background-color 0.5s;
}
.nav-chapters:hover {
text-decoration: none;
background-color: var(--theme-hover);
transition: background-color 0.15s, color 0.15s;
}
.nav-wrapper {
margin-top: 50px;
display: none;
}
.mobile-nav-chapters {
font-size: 2.5em;
text-align: center;
text-decoration: none;
width: 90px;
border-radius: 5px;
background-color: var(--sidebar-bg);
}
.previous {
float: left;
}
.next {
float: right;
right: var(--page-padding);
}
@media only screen and (max-width: 1080px) {
.nav-wide-wrapper { display: none; }
.nav-wrapper { display: block; }
}
@media only screen and (max-width: 1380px) {
.sidebar-visible .nav-wide-wrapper { display: none; }
.sidebar-visible .nav-wrapper { display: block; }
}
/* Inline code */
:not(pre) > .hljs {
display: inline;
padding: 0.1em 0.3em;
border-radius: 3px;
}
:not(pre):not(a) > .hljs {
color: var(--inline-code-color);
overflow-x: initial;
}
a:hover > .hljs {
text-decoration: underline;
}
pre {
position: relative;
}
pre > .buttons {
position: absolute;
z-index: 100;
right: 5px;
top: 5px;
color: var(--sidebar-fg);
cursor: pointer;
}
pre > .buttons :hover {
color: var(--sidebar-active);
}
pre > .buttons i {
margin-left: 8px;
}
pre > .buttons button {
color: inherit;
background: transparent;
border: none;
cursor: inherit;
}
pre > .result {
margin-top: 10px;
}
/* Search */
#searchresults a {
text-decoration: none;
}
mark {
border-radius: 2px;
padding: 0 3px 1px 3px;
margin: 0 -3px -1px -3px;
background-color: var(--search-mark-bg);
transition: background-color 300ms linear;
cursor: pointer;
}
mark.fade-out {
background-color: rgba(0,0,0,0) !important;
cursor: auto;
}
.searchbar-outer {
margin-left: auto;
margin-right: auto;
max-width: var(--content-max-width);
}
#searchbar {
width: 100%;
margin: 5px auto 0px auto;
padding: 10px 16px;
transition: box-shadow 300ms ease-in-out;
border: 1px solid var(--searchbar-border-color);
border-radius: 3px;
background-color: var(--searchbar-bg);
color: var(--searchbar-fg);
}
#searchbar:focus,
#searchbar.active {
box-shadow: 0 0 3px var(--searchbar-shadow-color);
}
.searchresults-header {
font-weight: bold;
font-size: 1em;
padding: 18px 0 0 5px;
color: var(--searchresults-header-fg);
}
.searchresults-outer {
margin-left: auto;
margin-right: auto;
max-width: var(--content-max-width);
border-bottom: 1px dashed var(--searchresults-border-color);
}
ul#searchresults {
list-style: none;
padding-left: 20px;
}
ul#searchresults li {
margin: 10px 0px;
padding: 2px;
border-radius: 2px;
}
ul#searchresults li.focus {
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FILE: docs/css/general.css
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FILE: docs/css/variables.css
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<h1 id="evaluator"><a class="header" href="#evaluator">Evaluator</a></h1>
<p>Now comes the most exciting part of the project. Evaluation is the final step that will produce the result for the Lisp program. At a high level, the evaluator function recursively walks the List-based structure created by the parser and evaluates each atomic object and list (recursively), combines these intermediate values, and produces the final result. </p>
<h2 id="source"><a class="header" href="#source">Source</a></h2>
<p><a href="https://github.com/vishpat/lisp-rs/blob/0.0.1/src/eval.rs">eval.rs</a></p>
<h2 id="code-walk-through"><a class="header" href="#code-walk-through">Code Walk Through</a></h2>
<p>The evaluator is implemented using the recursive <em>eval_obj</em> function. The <em>eval_obj</em> function takes the List object representing the program and the global <em>env</em> variable (a simple hashmap) as the input. The function then starts processing the List object representing the program by iterating over each element of this list </p>
<pre><code class="language-Rust">fn eval_obj(obj: &Object, env: &mut Rc<RefCell<Env>>)
-> Result<Object, String>
{
match obj {
Object::Void => Ok(Object::Void),
Object::Lambda(_params, _body) => Ok(Object::Void),
Object::Bool(_) => Ok(obj.clone()),
Object::Integer(n) => Ok(Object::Integer(*n)),
Object::Symbol(s) => eval_symbol(s, env),
Object::List(list) => eval_list(list, env),
}
}
</code></pre>
<p>In the case of the atomic objects such as an integer and boolean, the evaluator simply returns a copy of the object. In the case of the Void and Lambda (function objects), it returns the Void object. We will now walk through the <em>eval_symbol</em> and <em>eval_list</em> functions which implement most of the functionality of the evaluator.</p>
<h3 id="eval_symbol"><a class="header" href="#eval_symbol">eval_symbol</a></h3>
<p>Before understanding the <em>eval_symbol</em> function, it is important to understand the design of how variables are implemented for the Lisp interpreter.</p>
<p>The variables are just <em>string</em> labels assigned to values and they are created using the <strong>define</strong> keyword. Note a variable can be assigned atomic values such as integer or a boolean or it can be assigned function objects </p>
<pre><code class="language-Lisp">(
(define x 1)
(define sqr (lambda (r) (* r r)))
)
</code></pre>
<p>The above Lisp code defines (or creates) two variables with the names x and sqr that represent an integer and function object respectively. Also, the scope of these variables lies within the <em>list object</em> that they are defined under. This is achieved by storing the mapping from the variable names (strings) to the objects in a map-like data structure called <em>Env</em> as shown below.</p>
<pre><code class="language-Rust">// env.rs
pub struct Env {
parent: Option<Rc<RefCell<Env>>>,
vars: HashMap<String, Object>,
}
</code></pre>
<p>The interpreter creates an instance of <em>Env</em> at the start of the program to store the global variable definitions. In addition, for every function call, the interpreter creates a new instance of env and uses the new instance to evaluate the function call. This new instance of env contains the function parameters as well as a <em>back</em> pointer to the <em>parent</em> env instance from where the function is called as shown below with an example</p>
<pre><code class="language-Lisp">(
(define m 10)
(define n 12)
(define K 100)
(define func1 (lambda (x) (+ x K)))
(define func2 (lambda (x) (- x K)))
(func1 m)
(func2 n)
)
</code></pre>
<p><img src="images/env.png" alt="Function Call" /></p>
<p>This concept will become clearer as we will walk through the code.</p>
<p>The job of <em>eval_symbol</em> is to look up the Object bound to the symbol. This is done by recursively looking up in the passed <em>env</em> variable or any of its parent <em>env</em> until the <em>root env</em> of the program. </p>
<pre><code class="language-Rust">let val = env.borrow_mut().get(s);
if val.is_none() {
return Err(format!("Unbound symbol: {}", s));
}
Ok(val.unwrap().clone())
</code></pre>
<h3 id="eval_list"><a class="header" href="#eval_list">eval_list</a></h3>
<p>The <em>eval_list</em> function is the core of the evaluator and is implemented as shown below.</p>
<pre><code class="language-Rust">let head = &list[0];
match head {
Object::Symbol(s) => match s.as_str() {
"+" | "-" | "*" | "/" | "<" | ">" | "=" | "!=" => {
return eval_binary_op(&list, env);
}
"if" => eval_if(&list, env),
"define" => eval_define(&list, env),
"lambda" => eval_function_definition(&list),
_ => eval_function_call(&s, &list, env),
},
_ => {
let mut new_list = Vec::new();
for obj in list {
let result = eval_obj(obj, env)?;
match result {
Object::Void => {}
_ => new_list.push(result),
}
}
Ok(Object::List(new_list))
}
}
</code></pre>
<p>This function peeks at the head of the list and if the head does not match the symbol object, it iterates all of the elements of the list recursively evaluating each element and returning a new list with the evaluated object values.</p>
<h3 id="variable-definitions"><a class="header" href="#variable-definitions">Variable definitions</a></h3>
<p>If the head of the list in the <em>eval_list</em> function matches the <em>define</em> keyword, for example</p>
<pre><code class="language-Lisp">(define sqr (lambda (x) (* x x)))
</code></pre>
<p>the <em>eval_define</em> function calls <em>eval_obj</em> on the third argument of the list and assigns the evaluated object value to the symbol defined by the second argument in the list. The symbol and its object value are then stored in the current <em>env</em>. </p>
<pre><code class="language-Rust">let sym = match &list[1] {
Object::Symbol(s) => s.clone(),
_ => return Err(format!("Invalid define")),
};
let val = eval_obj(&list[2], env)?;
env.borrow_mut().set(&sym, val);
</code></pre>
<p>In the example above the symbol <em>sqr</em> and the function object representing the lambda will be stored in the current <em>env</em>. Once the function <em>sqr</em> has been defined in this manner, any latter code can access the corresponding function object by looking up the symbol <em>sqr</em> in <em>env</em>.</p>
<h3 id="binary-operations"><a class="header" href="#binary-operations">Binary operations</a></h3>
<p>If the head of the list in the <em>eval_list</em> function matches a binary operator, the list is evaluated on the basis of the type of the binary operator, for example </p>
<pre><code class="language-Lisp">(+ x y)
</code></pre>
<p>the <em>eval_binary_op</em> function calls the <em>eval_obj</em> on the second and third element of the list and performs the binary <strong>sum</strong> operation on the evaluated values.</p>
<h3 id="if-statement"><a class="header" href="#if-statement">If statement</a></h3>
<p>If the head of the list in the <em>eval_list</em> function matches the <em>if</em> keyword, for example</p>
<pre><code class="language-Lisp">(if (> x y) x y)
</code></pre>
<p>the <em>eval_if</em> function calls <strong>eval_obj</strong> on the second element of the list and depending upon whether the evaluated value is true or false, calls the eval_obj on either the third or fourth element of the list and returns the value</p>
<pre><code>let cond_obj = eval_obj(&list[1], env)?;
let cond = match cond_obj {
Object::Bool(b) => b,
_ => return Err(format!("Condition must be a boolean")),
};
if cond == true {
return eval_obj(&list[2], env);
} else {
return eval_obj(&list[3], env);
}
</code></pre>
<h3 id="lambda"><a class="header" href="#lambda">Lambda</a></h3>
<p>As mentioned earlier, the <em>lambda</em> (or function) object consists of two vectors</p>
<pre><code class="language-Rust">Lambda(Vec<String>, Vec<Object>)
</code></pre>
<p>If the head of the list in the <em>eval_list</em> function matches the <em>lambda</em> keyword, for example</p>
<pre><code class="language-Lisp">(lambda (x) (* x x))
</code></pre>
<p>the <em>eval_function_definition</em> function evaluates the second element of the list as a vector of parameter names. </p>
<pre><code class="language-Rust">let params = match &list[1] {
Object::List(list) => {
let mut params = Vec::new();
for param in list {
match param {
Object::Symbol(s) => params.push(s.clone()),
_ => return Err(format!("Invalid lambda parameter")),
}
}
params
}
_ => return Err(format!("Invalid lambda")),
};
</code></pre>
<p>The third element of the list is simply cloned as the function body.</p>
<pre><code class="language-Rust">let body = match &list[2] {
Object::List(list) => list.clone(),
_ => return Err(format!("Invalid lambda")),
};
</code></pre>
<pre><code class="language-Rust">Ok(Object::Lambda(params, body))
</code></pre>
<p>The evaluated parameter and body vector are returned as the <em>lambda</em> object</p>
<h3 id="function-call"><a class="header" href="#function-call">Function Call</a></h3>
<p>If the head of the list is a Symbol object and it does not match any of the aforementioned keywords or binary operators, the interpreter assumes that the Symbol object maps to a Lambda (function object). An example of the function call in Lisp is as follows</p>
<pre><code class="language-Lisp">(find_max a b c)
</code></pre>
<p>To evaluate this list the <em>eval_function_call</em> function is called. This function first performs the lookup for the function object using the function name, <em>find_max</em> in the case of this example.</p>
<pre><code class="language-Rust">let lamdba = env.borrow_mut().get(s);
if lamdba.is_none() {
return Err(format!("Unbound symbol: {}", s));
}
</code></pre>
<p>If the function object is found, a new <em>env</em> object is created. This new <em>env</em> object has a pointer to the parent <em>env</em> object. This is required to get the values of the variables not defined in the scope of the function.</p>
<pre><code class="language-Rust">let mut new_env = Rc::new(
RefCell::new(
Env::extend(env.clone())));
</code></pre>
<p>The next step in evaluating the function call requires preparing the function parameters. This is done by iterating over the remainder of the list and evaluating each parameter. The parameter name and the evaluated object are then set in the new <em>env</em> object.</p>
<pre><code class="language-Rust">for (i, param) in params.iter().enumerate() {
let val = eval_obj(&list[i + 1], env)?;
new_env.borrow_mut().set(param, val);
}
</code></pre>
<p>Finally, the function body is evaluated by passing the new_env, which contains the parameters to the function</p>
<pre><code class="language-Rust">let new_body = body.clone();
return eval_obj(&Object::List(new_body), &mut new_env);
</code></pre>
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/* Open Sans is licensed under the Apache License, Version 2.0. See http://www.apache.org/licenses/LICENSE-2.0 */
/* Source Code Pro is under the Open Font License. See https://scripts.sil.org/cms/scripts/page.php?site_id=nrsi&id=OFL */
/* open-sans-300 - latin_vietnamese_latin-ext_greek-ext_greek_cyrillic-ext_cyrillic */
@font-face {
font-family: 'Open Sans';
font-style: normal;
font-weight: 300;
src: local('Open Sans Light'), local('OpenSans-Light'),
url('open-sans-v17-all-charsets-300.woff2') format('woff2');
}
/* open-sans-300italic - latin_vietnamese_latin-ext_greek-ext_greek_cyrillic-ext_cyrillic */
@font-face {
font-family: 'Open Sans';
font-style: italic;
font-weight: 300;
src: local('Open Sans Light Italic'), local('OpenSans-LightItalic'),
url('open-sans-v17-all-charsets-300italic.woff2') format('woff2');
}
/* open-sans-regular - latin_vietnamese_latin-ext_greek-ext_greek_cyrillic-ext_cyrillic */
@font-face {
font-family: 'Open Sans';
font-style: normal;
font-weight: 400;
src: local('Open Sans Regular'), local('OpenSans-Regular'),
url('open-sans-v17-all-charsets-regular.woff2') format('woff2');
}
/* open-sans-italic - latin_vietnamese_latin-ext_greek-ext_greek_cyrillic-ext_cyrillic */
@font-face {
font-family: 'Open Sans';
font-style: italic;
font-weight: 400;
src: local('Open Sans Italic'), local('OpenSans-Italic'),
url('open-sans-v17-all-charsets-italic.woff2') format('woff2');
}
/* open-sans-600 - latin_vietnamese_latin-ext_greek-ext_greek_cyrillic-ext_cyrillic */
@font-face {
font-family: 'Open Sans';
font-style: normal;
font-weight: 600;
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}
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@font-face {
font-family: 'Open Sans';
font-style: italic;
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font-weight: 700;
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FILE: docs/highlight.css
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/*
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color: #b31d28;
background-color: #ffeef0;
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gitextract_y9aowojs/
├── .gitignore
├── .rustfmt.toml
├── Cargo.toml
├── LICENSE
├── README.md
├── docs/
│ ├── .nojekyll
│ ├── 404.html
│ ├── FontAwesome/
│ │ └── css/
│ │ └── font-awesome.css
│ ├── ayu-highlight.css
│ ├── book.js
│ ├── css/
│ │ ├── chrome.css
│ │ ├── general.css
│ │ ├── print.css
│ │ └── variables.css
│ ├── evaluator.html
│ ├── fonts/
│ │ ├── OPEN-SANS-LICENSE.txt
│ │ ├── SOURCE-CODE-PRO-LICENSE.txt
│ │ └── fonts.css
│ ├── highlight.css
│ ├── highlight.js
│ ├── index.html
│ ├── introduction.html
│ ├── lexer.html
│ ├── next.html
│ ├── overview.html
│ ├── parser.html
│ ├── print.html
│ ├── repl.html
│ ├── searcher.js
│ ├── searchindex.js
│ ├── searchindex.json
│ └── tomorrow-night.css
└── src/
├── env.rs
├── eval.rs
├── lexer.rs
├── lib.rs
├── main.rs
├── object.rs
└── parser.rs
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function hasFocus (line 57) | function hasFocus() {
function removeChildren (line 61) | function removeChildren(elem) {
function parseURL (line 68) | function parseURL(url) {
function renderURL (line 94) | function renderURL(urlobject) {
function formatSearchMetric (line 128) | function formatSearchMetric(count, searchterm) {
function formatSearchResult (line 138) | function formatSearchResult(result, searchterms) {
function makeTeaser (line 159) | function makeTeaser(body, searchterms) {
function init (line 255) | function init(config) {
function unfocusSearchbar (line 275) | function unfocusSearchbar() {
function doSearchOrMarkFromUrl (line 285) | function doSearchOrMarkFromUrl() {
function globalKeyHandler (line 318) | function globalKeyHandler(e) {
function showSearch (line 367) | function showSearch(yes) {
function showResults (line 381) | function showResults(yes) {
function searchIconClickHandler (line 390) | function searchIconClickHandler() {
function searchbarKeyUpHandler (line 401) | function searchbarKeyUpHandler() {
function setSearchUrlParameters (line 422) | function setSearchUrlParameters(searchterm, action) {
function doSearch (line 443) | function doSearch(searchterm) {
FILE: src/env.rs
type Env (line 7) | pub struct Env {
method new (line 13) | pub fn new() -> Self {
method update (line 17) | pub fn update(&mut self, data: Rc<RefCell<Self>>) {
method extend (line 27) | pub fn extend(parent: Rc<RefCell<Self>>) -> Env {
method get (line 34) | pub fn get(&self, name: &str) -> Option<Object> {
method set (line 44) | pub fn set(&mut self, name: &str, val: Object) {
FILE: src/eval.rs
function print_list (line 8) | fn print_list(
function eval_cons (line 24) | fn eval_cons(
function eval_car (line 46) | fn eval_car(
function eval_cdr (line 57) | fn eval_cdr(
function eval_length (line 74) | fn eval_length(
function eval_is_null (line 90) | fn eval_is_null(
function eval_binary_op (line 104) | fn eval_binary_op(
function eval_begin (line 311) | fn eval_begin(
function eval_let (line 325) | fn eval_let(
function eval_define (line 379) | fn eval_define(
function eval_list_data (line 412) | fn eval_list_data(
function eval_cond (line 424) | fn eval_cond(
function eval_else (line 471) | fn eval_else(
function eval_function_definition (line 485) | fn eval_function_definition(
function eval_symbol (line 519) | fn eval_symbol(
function eval_keyword (line 537) | fn eval_keyword(
function eval_obj (line 562) | fn eval_obj(
function eval (line 702) | pub fn eval(
function test_simple_add (line 718) | fn test_simple_add() {
function test_simple_sub (line 725) | fn test_simple_sub() {
function test_str_add (line 732) | fn test_str_add() {
function test_str_eq_false (line 743) | fn test_str_eq_false() {
function test_str_eq_true (line 751) | fn test_str_eq_true() {
function test_greater_than_str (line 760) | fn test_greater_than_str() {
function test_less_than_str (line 768) | fn test_less_than_str() {
function test_str_with_spaces (line 776) | fn test_str_with_spaces() {
function test_str_with_spaces_2 (line 788) | fn test_str_with_spaces_2() {
function test_greater_than_int (line 808) | fn test_greater_than_int() {
function test_less_than_int (line 815) | fn test_less_than_int() {
function test_modulo (line 822) | fn test_modulo() {
function test_area_of_a_circle_float (line 829) | fn test_area_of_a_circle_float() {
function test_area_of_a_circle (line 845) | fn test_area_of_a_circle() {
function test_sqr_function (line 861) | fn test_sqr_function() {
function test_fibonaci (line 873) | fn test_fibonaci() {
function test_factorial (line 890) | fn test_factorial() {
function test_circle_area_no_lambda (line 904) | fn test_circle_area_no_lambda() {
function test_circle_area_function (line 924) | fn test_circle_area_function() {
function test_tail_recursion (line 944) | fn test_tail_recursion() {
function test_tail_recursive_factorial (line 961) | fn test_tail_recursive_factorial() {
function test_closure1 (line 979) | fn test_closure1() {
function test_tail_recursive_fibonnaci (line 996) | fn test_tail_recursive_fibonnaci() {
function test_inline_lambda (line 1015) | fn test_inline_lambda() {
function test_car (line 1028) | fn test_car() {
function test_cdr (line 1041) | fn test_cdr() {
function test_length (line 1060) | fn test_length() {
function test_sum_list_of_integers (line 1073) | fn test_sum_list_of_integers() {
function test_function_application (line 1090) | fn test_function_application() {
function test_begin_scope_test (line 1108) | fn test_begin_scope_test() {
function test_begin_scope_test_2 (line 1136) | fn test_begin_scope_test_2() {
function test_cond_1 (line 1154) | fn test_cond_1() {
function test_cond_2 (line 1168) | fn test_cond_2() {
function test_cond_3 (line 1182) | fn test_cond_3() {
function test_let_1 (line 1196) | fn test_let_1() {
function test_let_2 (line 1217) | fn test_let_2() {
function test_let_3 (line 1234) | fn test_let_3() {
function test_map (line 1248) | fn test_map() {
function test_filter (line 1274) | fn test_filter() {
function test_fold_left (line 1300) | fn test_fold_left() {
function test_reduce (line 1317) | fn test_reduce() {
FILE: src/lexer.rs
type Token (line 7) | pub enum Token {
type TokenError (line 19) | pub struct TokenError {
method fmt (line 26) | fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
type Tokenizer (line 31) | struct Tokenizer<'a> {
function new (line 39) | pub fn new(input: &'a str) -> Self {
function advance (line 65) | fn advance(&mut self) -> Option<char> {
function eat_whitespace (line 70) | fn eat_whitespace(&mut self) {
function read_symbol (line 79) | fn read_symbol(&mut self) -> String {
function read_number (line 95) | fn read_number(&mut self) -> String {
function read_string (line 107) | fn read_string(&mut self) -> String {
function next_token (line 121) | pub fn next_token(&mut self) -> Option<Token> {
function tokenize (line 162) | pub fn tokenize(
function test_add (line 179) | fn test_add() {
function test_area_of_a_circle (line 194) | fn test_area_of_a_circle() {
FILE: src/lib.rs
function lisp_rs_eval (line 11) | pub fn lisp_rs_eval(input: &str) -> String {
FILE: src/main.rs
constant PROMPT (line 12) | const PROMPT: &str = "lisp-rs> ";
function main (line 14) | fn main() -> Result<(), Box<dyn std::error::Error>> {
FILE: src/object.rs
type Object (line 7) | pub enum Object {
method fmt (line 22) | fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
FILE: src/parser.rs
type ParseError (line 8) | pub struct ParseError {
method fmt (line 13) | fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
function parse (line 20) | pub fn parse(program: &str) -> Result<Object, ParseError> {
function parse_list (line 37) | fn parse_list(
function test_add (line 82) | fn test_add() {
function test_area_of_a_circle (line 95) | fn test_area_of_a_circle() {
Condensed preview — 39 files, each showing path, character count, and a content snippet. Download the .json file or copy for the full structured content (894K chars).
[
{
"path": ".gitignore",
"chars": 8,
"preview": "/target\n"
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{
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"chars": 26,
"preview": "max_width=60\ntab_spaces=2\n"
},
{
"path": "Cargo.toml",
"chars": 604,
"preview": "[package]\nname = \"lisp-rs\"\nversion = \"0.3.5\"\nedition = \"2021\"\nlicense = \"MIT\"\nhomepage = \"https://vishpat.github.io/lisp"
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{
"path": "LICENSE",
"chars": 1069,
"preview": "MIT License\n\nCopyright (c) 2022 Vishal Patil\n\nPermission is hereby granted, free of charge, to any person obtaining a co"
},
{
"path": "README.md",
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"preview": "# lisp-rs\n\nA simple Lisp interpreter/library in Rust. The interpreter/library was initially developed as a **teaching ai"
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{
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{
"path": "docs/404.html",
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"preview": "\"use strict\";\n\n// Fix back button cache problem\nwindow.onunload = function () { };\n\n// Global variable, shared between m"
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"preview": "/* CSS for UI elements (a.k.a. chrome) */\n\n@import 'variables.css';\n\n::-webkit-scrollbar {\n background: var(--bg);\n}\n"
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"preview": "/* Base styles and content styles */\n\n@import 'variables.css';\n\n:root {\n /* Browser default font-size is 16px, this w"
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"preview": "\n#sidebar,\n#menu-bar,\n.nav-chapters,\n.mobile-nav-chapters {\n display: none;\n}\n\n#page-wrapper.page-wrapper {\n trans"
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"path": "docs/css/variables.css",
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"preview": "Object.assign(window.search, {\"doc_urls\":[\"overview.html#overview\",\"overview.html#pre-requistes\",\"overview.html#lisp-dia"
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"chars": 1489,
"preview": "mod env;\nmod eval;\nmod lexer;\nmod object;\nmod parser;\n\nuse object::Object;\nuse std::cell::RefCell;\nuse std::rc::Rc;\n\npub"
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"preview": "use crate::env::*;\nuse std::cell::RefCell;\nuse std::fmt;\nuse std::rc::Rc;\n\n#[derive(Debug, Clone, PartialEq)]\npub enum O"
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{
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"chars": 3139,
"preview": "use crate::lexer::*;\nuse crate::object::*;\nuse std::error::Error;\nuse std::fmt;\nuse std::rc::Rc;\n\n#[derive(Debug)]\npub s"
}
]
About this extraction
This page contains the full source code of the vishpat/lisp-rs GitHub repository, extracted and formatted as plain text for AI agents and large language models (LLMs). The extraction includes 39 files (778.0 KB), approximately 271.8k tokens, and a symbol index with 183 extracted functions, classes, methods, constants, and types. Use this with OpenClaw, Claude, ChatGPT, Cursor, Windsurf, or any other AI tool that accepts text input. You can copy the full output to your clipboard or download it as a .txt file.
Extracted by GitExtract — free GitHub repo to text converter for AI. Built by Nikandr Surkov.