434 lines
34 KiB
HTML
434 lines
34 KiB
HTML
<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"/><meta content="width=device-width, initial-scale=1" name="viewport"/><title> <loganGatlin/> </title><link href="resources/favicon.svg" type="image/x-icon" rel="icon"/><style>
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/*!
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Pure v3.0.0
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Copyright 2013 Yahoo!
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Licensed under the BSD License.
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https://github.com/pure-css/pure/blob/master/LICENSE
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*/
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/*!
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normalize.css v | MIT License | https://necolas.github.io/normalize.css/
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Copyright (c) Nicolas Gallagher and Jonathan Neal
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*/
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/*! normalize.css v8.0.1 | MIT License | github.com/necolas/normalize.css */html{line-height:1.15;-webkit-text-size-adjust:100%}body{margin:0}main{display:block}h1{font-size:2em;margin:.67em 0}hr{box-sizing:content-box;height:0;overflow:visible}pre{font-family:monospace,monospace;font-size:1em}a{background-color:transparent}abbr[title]{border-bottom:none;text-decoration:underline;-webkit-text-decoration:underline dotted;text-decoration:underline 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.pure-menu-children{left:0;top:auto;width:inherit}.pure-menu-active>.pure-menu-children,.pure-menu-allow-hover:hover>.pure-menu-children{display:block;position:absolute}.pure-menu-has-children>.pure-menu-link:after{padding-left:.5em;content:"\25B8";font-size:small}.pure-menu-horizontal .pure-menu-has-children>.pure-menu-link:after{content:"\25BE"}.pure-menu-scrollable{overflow-y:scroll;overflow-x:hidden}.pure-menu-scrollable .pure-menu-list{display:block}.pure-menu-horizontal.pure-menu-scrollable .pure-menu-list{display:inline-block}.pure-menu-horizontal.pure-menu-scrollable{white-space:nowrap;overflow-y:hidden;overflow-x:auto;padding:.5em 0}.pure-menu-horizontal .pure-menu-children .pure-menu-separator,.pure-menu-separator{background-color:#ccc;height:1px;margin:.3em 0}.pure-menu-horizontal .pure-menu-separator{width:1px;height:1.3em;margin:0 .3em}.pure-menu-horizontal .pure-menu-children .pure-menu-separator{display:block;width:auto}.pure-menu-heading{text-transform:uppercase;color:#565d64}.pure-menu-link{color:#777}.pure-menu-children{background-color:#fff}.pure-menu-heading,.pure-menu-link{padding:.5em 1em}.pure-menu-disabled{opacity:.5}.pure-menu-disabled .pure-menu-link:hover{background-color:transparent;cursor:default}.pure-menu-active>.pure-menu-link,.pure-menu-link:focus,.pure-menu-link:hover{background-color:#eee}.pure-menu-selected>.pure-menu-link,.pure-menu-selected>.pure-menu-link:visited{color:#000}.pure-table{border-collapse:collapse;border-spacing:0;empty-cells:show;border:1px solid #cbcbcb}.pure-table caption{color:#000;font:italic 85%/1 arial,sans-serif;padding:1em 0;text-align:center}.pure-table td,.pure-table th{border-left:1px solid #cbcbcb;border-width:0 0 0 1px;font-size:inherit;margin:0;overflow:visible;padding:.5em 1em}.pure-table thead{background-color:#e0e0e0;color:#000;text-align:left;vertical-align:bottom}.pure-table td{background-color:transparent}.pure-table-odd td{background-color:#f2f2f2}.pure-table-striped tr:nth-child(2n-1) td{background-color:#f2f2f2}.pure-table-bordered td{border-bottom:1px solid #cbcbcb}.pure-table-bordered tbody>tr:last-child>td{border-bottom-width:0}.pure-table-horizontal td,.pure-table-horizontal th{border-width:0 0 1px 0;border-bottom:1px solid #cbcbcb}.pure-table-horizontal tbody>tr:last-child>td{border-bottom-width:0}
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</style><style>
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@font-face {
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font-family: Cascadia;
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src: url("/resources/CascadiaMonoPL.woff2");
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}
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body {
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color: #444;
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font-size: 1.2em;
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}
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.link {
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text-decoration: none;
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color: #1e90ff;
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}
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.link :visited {
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color: #1e90ff;
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}
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table {
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display: block;
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margin-top: 1em;
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margin-bottom: 1em;
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margin-left: auto;
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margin-right: auto;
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width: 60%;
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text-align: left;
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border-collapse: collapse;
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}
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th {
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padding: 0.25em 0.25em 0.25em 0.25em;
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border: 2px solid;
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border-collapse: collapse;
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}
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td {
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padding: 0.25em 0.25em 0.25em 0.25em;
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border: 2px solid;
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border-collapse: collapse;
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}
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/* https://css-loaders.com/spinner/ */
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/* HTML: <div class="loader"></div> */
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.loading {
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width: 512px;
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padding: 8px;
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aspect-ratio: 1;
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border-radius: 50%;
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background: #25b09b;
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--_m:
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conic-gradient(#0000 10%,#000),
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linear-gradient(#000 0 0) content-box;
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-webkit-mask: var(--_m);
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mask: var(--_m);
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-webkit-mask-composite: source-out;
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mask-composite: subtract;
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animation: l3 1s infinite linear;
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}
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@keyframes l3 {to{transform: rotate(1turn)}}
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.centered {
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display: block;
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margin-top: 1em;
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margin-bottom: 1em;
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margin-left: auto;
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margin-right: auto;
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justify-content: center;
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width: 50%;
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}
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.pure-img-responsive { max-width: 100%; height: auto;
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}
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.cascadia {
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font-family: Cascadia;
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}
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.home-menu {
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padding: 0.5em;
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text-align: center;
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box-shadow: 0 1px 1px rgba(0,0,0, 0.10);
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}
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.home-menu {
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background: #333;
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}
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.home-menu a {
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color: #ccc;
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}
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.home-menu li a:hover,
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.home-menu li a:focus {
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animation: menu-hover-anim 0.25s ease-out;
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animation-fill-mode: forwards;
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background: none;
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border: none;
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}
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.link {
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color: #00f;
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text-decoration: none;
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}
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.video {
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text-align: center;
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}
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.video iframe {
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width: 32em;
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height: 18em;
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frameborder: "0";
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}
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/*
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Add transition to containers so they can push in and out.
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*/
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#layout,
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#menu,
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.menu-link {
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-webkit-transition: all 0.2s ease-out;
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-moz-transition: all 0.2s ease-out;
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-ms-transition: all 0.2s ease-out;
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-o-transition: all 0.2s ease-out;
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transition: all 0.2s ease-out;
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}
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/*
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This is the parent `<div>` that contains the menu and the content area.
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*/
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#layout {
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position: relative;
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left: 0;
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padding-left: 0;
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}
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#layout.active #menu {
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left: 150px;
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width: 150px;
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}
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#layout.active .menu-link {
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left: 150px;
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}
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/*
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The content `<div>` is where all your content goes.
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*/
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.content {
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margin: 0 auto;
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padding: 0 2em;
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max-width: 800px;
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margin-bottom: 50px;
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line-height: 1.6em;
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text-align: justify;
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}
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header {
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margin: 0;
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color: #444;
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text-align: center;
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padding: 2.5em 4em 0;
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border-bottom: 1px solid #eee;
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}
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header h1 {
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margin: 0.2em 0;
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font-size: 2.5em;
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font-weight: bold;
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}
|
|
header h2 {
|
|
font-weight: 300;
|
|
color: #888;
|
|
padding: 0;
|
|
margin-top: 0;
|
|
}
|
|
|
|
.distinct {
|
|
background-color: #444;
|
|
color: #fff;
|
|
padding: 0.5em 0.5em 0.5em 0.5em;
|
|
}
|
|
|
|
/* @keyframes card-hover-anim { */
|
|
/* to {background-color: #ccc;} */
|
|
/* } */
|
|
/* @keyframes card-text-hover-anim { */
|
|
/* to {color: #222;} */
|
|
/* } */
|
|
|
|
.spaced {
|
|
padding: 0.5em 0.5em 0.5em 0.5em;
|
|
margin: 1em 0em 1em 0em;
|
|
}
|
|
|
|
svg {
|
|
width: 1em;
|
|
vertical-align: middle;
|
|
}
|
|
|
|
.card {
|
|
background-color: #eee;
|
|
text-decoration: none;
|
|
text-align: left;
|
|
}
|
|
|
|
.card h1 {
|
|
/* color: #444; */
|
|
}
|
|
.card h2 {
|
|
color: #777;
|
|
}
|
|
.card h3 {
|
|
color: #999;
|
|
}
|
|
/* .card a { */
|
|
/* text-decoration: none; */
|
|
/* display: block; */
|
|
/* } */
|
|
|
|
.card:hover {
|
|
animation: card-hover-anim 0.25s ease-out;
|
|
animation-fill-mode: forwards;
|
|
}
|
|
|
|
|
|
/* .card:hover h3 { */
|
|
/* animation: card-text-hover-anim 0.25s ease-out; */
|
|
/* animation-fill-mode: forwards; */
|
|
/* } */
|
|
|
|
.card img {
|
|
vertical-align: bottom;
|
|
float: right;
|
|
padding: 0em 0.1em 0em 0.1em;
|
|
width: 60px;
|
|
}
|
|
.card svg {
|
|
vertical-align: bottom;
|
|
float: right;
|
|
padding: 0em 0.1em 0em 0.1em;
|
|
width: 3em;
|
|
height: auto;
|
|
}
|
|
|
|
|
|
.content-subhead {
|
|
margin: 50px 0 20px 0;
|
|
font-weight: 300;
|
|
color: #444;
|
|
}
|
|
|
|
code {
|
|
font-family: Cascadia;
|
|
}
|
|
|
|
.code-block {
|
|
/* background-color: #fdf6e3; */
|
|
background-color: #eee;
|
|
color: #002b36;
|
|
font-family: Cascadia;
|
|
font-size: 0.85em;
|
|
padding: 0em 0.5em 0em 0.5em;
|
|
margin: 1em 0em 1em 0em;
|
|
page-break-inside: avoid;
|
|
display: block;
|
|
overflow: auto;
|
|
word-wrap: break-word;
|
|
max-width: 100%;
|
|
}
|
|
.code-block pre {
|
|
display: block;
|
|
margin: 0 0 0 0;
|
|
padding: 0 0 0 0;
|
|
}
|
|
|
|
.code-block pre code {
|
|
font-family: Cascadia;
|
|
display: block;
|
|
white-space: pre-wrap;
|
|
}
|
|
.code-block span {
|
|
/* background-color: #fdf6e3; */
|
|
background-color: #eee;
|
|
}
|
|
.keyword {
|
|
color: #6c71c4;
|
|
}
|
|
.constant {
|
|
color: #cb4b16;
|
|
}
|
|
.function {
|
|
color: #268bd2;
|
|
}
|
|
.operator {
|
|
color: #6c71c4;
|
|
}
|
|
.punctuation {
|
|
color: #586e75;
|
|
}
|
|
.string {
|
|
color: #859900;
|
|
}
|
|
.type {
|
|
color: #2aa198;
|
|
}
|
|
.property {
|
|
color: #586e75;
|
|
}
|
|
</style></head><body><div class="pure-g"><div class="pure-u-1-1"><header class="header"><h1> HTML Templating Engine <a target="_blank" href="https://github.com/Xterminate1818/html"><svg viewBox="0 0 128 128" style="padding-bottom: 0.2em;"><title> View source on GitHub </title><g fill="#181616"><path d="M64 5.103c-33.347 0-60.388 27.035-60.388 60.388 0 26.682 17.303 49.317 41.297 57.303 3.017.56 4.125-1.31 4.125-2.905 0-1.44-.056-6.197-.082-11.243-16.8 3.653-20.345-7.125-20.345-7.125-2.747-6.98-6.705-8.836-6.705-8.836-5.48-3.748.413-3.67.413-3.67 6.063.425 9.257 6.223 9.257 6.223 5.386 9.23 14.127 6.562 17.573 5.02.542-3.903 2.107-6.568 3.834-8.076-13.413-1.525-27.514-6.704-27.514-29.843 0-6.593 2.36-11.98 6.223-16.21-.628-1.52-2.695-7.662.584-15.98 0 0 5.07-1.623 16.61 6.19C53.7 35 58.867 34.327 64 34.304c5.13.023 10.3.694 15.127 2.033 11.526-7.813 16.59-6.19 16.59-6.19 3.287 8.317 1.22 14.46.593 15.98 3.872 4.23 6.215 9.617 6.215 16.21 0 23.194-14.127 28.3-27.574 29.796 2.167 1.874 4.097 5.55 4.097 11.183 0 8.08-.07 14.583-.07 16.572 0 1.607 1.088 3.49 4.148 2.897 23.98-7.994 41.263-30.622 41.263-57.294C124.388 32.14 97.35 5.104 64 5.104z" fill-rule="evenodd" clip-rule="evenodd"></path><path d="M26.484 91.806c-.133.3-.605.39-1.035.185-.44-.196-.685-.605-.543-.906.13-.31.603-.395 1.04-.188.44.197.69.61.537.91zm2.446 2.729c-.287.267-.85.143-1.232-.28-.396-.42-.47-.983-.177-1.254.298-.266.844-.14 1.24.28.394.426.472.984.17 1.255zM31.312 98.012c-.37.258-.976.017-1.35-.52-.37-.538-.37-1.183.01-1.44.373-.258.97-.025 1.35.507.368.545.368 1.19-.01 1.452zm3.261 3.361c-.33.365-1.036.267-1.552-.23-.527-.487-.674-1.18-.343-1.544.336-.366 1.045-.264 1.564.23.527.486.686 1.18.333 1.543zm4.5 1.951c-.147.473-.825.688-1.51.486-.683-.207-1.13-.76-.99-1.238.14-.477.823-.7 1.512-.485.683.206 1.13.756.988 1.237zm4.943.361c.017.498-.563.91-1.28.92-.723.017-1.308-.387-1.315-.877 0-.503.568-.91 1.29-.924.717-.013 1.306.387 1.306.88zm4.598-.782c.086.485-.413.984-1.126 1.117-.7.13-1.35-.172-1.44-.653-.086-.498.422-.997 1.122-1.126.714-.123 1.354.17 1.444.663zm0 0"></path></g></svg></a></h1><h2> Front End - Parser Design </h2></header><div class="content"><h2 class="distinct"> Motivation </h2>
|
|
HTML is a powerful tool for creating static web pages, but
|
|
is not easily modular or scalable. Front end frameworks like
|
|
React provide reusable components. I want to use components
|
|
without the overhead of a front-end framework. I want the final output to be statically generated rather than generated on the fly
|
|
by the server or the client, minified and with inlined CSS and
|
|
JavaScript.
|
|
<h2 class="distinct"> Approach </h2>
|
|
After looking at some of the HTML parsing libraries, I was
|
|
unsatisfied with the approaches most developers took. The DOM
|
|
is represented as a tree structure, where each node keeps a
|
|
pointer to its children.
|
|
<div class="code-block">
|
|
<pre><code>
|
|
<span class="comment">// From the html_parser crate</span>
|
|
<span class="keyword">pub</span> <span class="keyword storage type">enum</span> <span class="type">Node</span> <span class="punctuation bracket">{</span>
|
|
<span class="type enum variant">Text</span><span class="punctuation bracket">(</span><span class="type">String</span><span class="punctuation bracket">)</span><span class="punctuation delimiter">,</span>
|
|
<span class="type enum variant">Element</span><span class="punctuation bracket">(</span><span class="type">Element</span><span class="punctuation bracket">)</span><span class="punctuation delimiter">,</span>
|
|
<span class="type enum variant">Comment</span><span class="punctuation bracket">(</span><span class="type">String</span><span class="punctuation bracket">)</span><span class="punctuation delimiter">,</span>
|
|
<span class="punctuation bracket">}</span>
|
|
|
|
<span class="keyword">pub</span> <span class="keyword storage type">struct</span> <span class="type">Element</span> <span class="punctuation bracket">{</span>
|
|
<span class="keyword">pub</span> <span class="variable other member">name</span>: <span class="type">String</span><span class="punctuation delimiter">,</span>
|
|
<span class="keyword">pub</span> <span class="variable other member">attributes</span>: <span class="type">HashMap</span><span class="punctuation bracket"><</span><span class="type">String</span><span class="punctuation delimiter">,</span> <span class="type">Option</span><span class="punctuation bracket"><</span><span class="type">String</span><span class="punctuation bracket">></span><span class="punctuation bracket">></span><span class="punctuation delimiter">,</span>
|
|
<span class="keyword">pub</span> <span class="variable other member">children</span>: <span class="type">Vec</span><span class="punctuation bracket"><</span><span class="type">Node</span><span class="punctuation bracket">></span><span class="punctuation delimiter">,</span>
|
|
<span class="comment">// other fields omitted</span>
|
|
<span class="punctuation bracket">}</span>
|
|
</code></pre>
|
|
</div>
|
|
This is bad for cache locality and effectively forces the use
|
|
of recursion in order to traverse the DOM. Recursion is undesirable
|
|
for performance and robustness reasons. My approach is to create a
|
|
flat array of elements. Parsing is done using a non-recursive parser
|
|
combinator model.
|
|
<div class="code-block">
|
|
<pre><code>
|
|
<span class="comment">// My implementation (fields omitted)</span>
|
|
<span class="keyword">pub</span> <span class="keyword storage type">enum</span> <span class="type">HtmlElement</span> <span class="punctuation bracket">{</span>
|
|
<span class="type enum variant">DocType</span><span class="punctuation delimiter">,</span>
|
|
<span class="type enum variant">Comment</span><span class="punctuation bracket">(</span><span class="comment">/* */</span><span class="punctuation bracket">)</span><span class="punctuation delimiter">,</span>
|
|
<span class="type enum variant">OpenTag</span> <span class="punctuation bracket">{</span> <span class="comment">/* */</span> <span class="punctuation bracket">}</span><span class="punctuation delimiter">,</span>
|
|
<span class="type enum variant">CloseTag</span> <span class="punctuation bracket">{</span> <span class="comment">/* */</span> <span class="punctuation bracket">}</span><span class="punctuation delimiter">,</span>
|
|
<span class="type enum variant">Text</span><span class="punctuation bracket">(</span> <span class="comment">/* */</span> <span class="punctuation bracket">)</span><span class="punctuation delimiter">,</span>
|
|
<span class="type enum variant">Script</span> <span class="punctuation bracket">{</span> <span class="comment">/* */</span> <span class="punctuation bracket">}</span><span class="punctuation delimiter">,</span>
|
|
<span class="type enum variant">Style</span> <span class="punctuation bracket">{</span> <span class="comment">/* */</span> <span class="punctuation bracket">}</span><span class="punctuation delimiter">,</span>
|
|
<span class="type enum variant">Directive</span> <span class="punctuation bracket">{</span> <span class="comment">/* */</span> <span class="punctuation bracket">}</span><span class="punctuation delimiter">,</span>
|
|
<span class="punctuation bracket">}</span>
|
|
</code></pre>
|
|
</div>
|
|
This approach lends itself to linear iterative algorithms. An
|
|
element's children can be represented as a slice of the DOM array,
|
|
from the opening tag to its close tag.
|
|
<h2 class="distinct"> Templates </h2>
|
|
I define a "template" as a user defined element which expands into
|
|
a larger piece of HTML. Templates can pass on children and attributes
|
|
to the final output. Some special templates can perform other functions,
|
|
like inlining a CSS file or syntax highlighting a code block.
|
|
<div class="code-block">
|
|
<pre><code>
|
|
<span class="comment"><!-- Here is a template definition --></span>
|
|
<span class="punctuation bracket"><</span><span class="tag">Echo</span><span class="punctuation bracket">></span>
|
|
<span class="punctuation bracket"><</span><span class="tag">h1</span> <span class="attribute">class</span><span class="punctuation delimiter">=</span><span class="string">@class1</span><span class="punctuation bracket">></span>
|
|
<span class="punctuation bracket"><</span>@children<span class="punctuation bracket">/></span>
|
|
<span class="punctuation bracket"></</span><span class="tag">h1</span><span class="punctuation bracket">></span>
|
|
<span class="punctuation bracket"><</span><span class="tag">h2</span> <span class="attribute">class</span><span class="punctuation delimiter">=</span><span class="string">@class2</span><span class="punctuation bracket">></span>
|
|
<span class="punctuation bracket"><</span>@children<span class="punctuation bracket">/></span>
|
|
<span class="punctuation bracket"></</span><span class="tag">h2</span><span class="punctuation bracket">></span>
|
|
<span class="punctuation bracket"><</span><span class="tag">h3</span> <span class="attribute">class</span><span class="punctuation delimiter">=</span><span class="string">@class3</span><span class="punctuation bracket">></span>
|
|
<span class="punctuation bracket"><</span>@children<span class="punctuation bracket">/></span>
|
|
<span class="punctuation bracket"></</span><span class="tag">h3</span><span class="punctuation bracket">></span>
|
|
<span class="punctuation bracket"></</span><span class="tag">Echo</span><span class="punctuation bracket">></span>
|
|
|
|
<span class="comment"><!-- And this is how to use the template --></span>
|
|
<span class="punctuation bracket"><</span><span class="tag">Echo</span> <span class="attribute">class1</span><span class="punctuation delimiter">=</span><span class="string">"</span><span class="string">some_class1</span><span class="string">"</span> <span class="attribute">class2</span><span class="punctuation delimiter">=</span><span class="string">"</span><span class="string">some_class2</span><span class="string">"</span> <span class="attribute">class3</span><span class="punctuation delimiter">=</span><span class="string">"</span><span class="string">some_class3</span><span class="string">"</span><span class="punctuation bracket">></span>
|
|
Echo!
|
|
<span class="punctuation bracket"></</span><span class="tag">Echo</span><span class="punctuation bracket">></span>
|
|
|
|
<span class="comment"><!-- Which expands to this --></span>
|
|
<span class="punctuation bracket"><</span><span class="tag">h1</span> <span class="attribute">class</span><span class="punctuation delimiter">=</span><span class="string">"</span><span class="string">some_class1</span><span class="string">"</span><span class="punctuation bracket">></span>
|
|
Echo!
|
|
<span class="punctuation bracket"></</span><span class="tag">h1</span><span class="punctuation bracket">></span>
|
|
<span class="punctuation bracket"><</span><span class="tag">h2</span> <span class="attribute">class</span><span class="punctuation delimiter">=</span><span class="string">"</span><span class="string">some_class2</span><span class="string">"</span><span class="punctuation bracket">></span>
|
|
Echo!
|
|
<span class="punctuation bracket"></</span><span class="tag">h2</span><span class="punctuation bracket">></span>
|
|
<span class="punctuation bracket"><</span><span class="tag">h3</span> <span class="attribute">class</span><span class="punctuation delimiter">=</span><span class="string">"</span><span class="string">some_class3</span><span class="string">"</span><span class="punctuation bracket">></span>
|
|
Echo!
|
|
<span class="punctuation bracket"></</span><span class="tag">h3</span><span class="punctuation bracket">></span>
|
|
</code></pre>
|
|
</div>
|
|
The example above shows how templates can inherit attributes and child
|
|
elements from their invocation. Special templates begin with the '@'
|
|
symbol, and perform some sort of meta-function. In addition to
|
|
<@children/>, <@code/> performs syntax highlighting, and
|
|
<@style/> inlines a CSS file.
|
|
|
|
<h2 class="distinct"> Dependencies </h2>
|
|
The templating engine only relies on two crates for performing syntax
|
|
highlighting of code blocks. It uses inkjet, a thin wrapper over
|
|
treesitter. Treesitter is an efficient error-tolerant language parser
|
|
commonly used in IDEs. While it is fast, it is by far the slowest and
|
|
most cumbersome part of the program. Good looking formatted code is
|
|
important for my website, and implementing parsers for every language
|
|
I use is out of scope, so this is a necessary evil.
|
|
<div class="code-block">
|
|
<pre><code>
|
|
// Snippet from Cargo<span class="punctuation delimiter">.</span>toml
|
|
<span class="punctuation bracket">[</span><span class="type">dependencies</span><span class="punctuation bracket">]</span>
|
|
<span class="variable other member">inkjet</span> <span class="operator">=</span> <span class="string">"0.10"</span>
|
|
<span class="variable other member">v_htmlescape</span> <span class="operator">=</span> <span class="string">"0.15"</span>
|
|
</code></pre>
|
|
</div></div></div></div></body></html> |