1361 lines
37 KiB
HTML
1361 lines
37 KiB
HTML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
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"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
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<head>
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<meta http-equiv="Content-Type" content="application/xhtml+xml; charset=UTF-8" />
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<meta name="generator" content="AsciiDoc 10.2.0" />
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<title>parse-options API</title>
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<style type="text/css">
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/* Shared CSS for AsciiDoc xhtml11 and html5 backends */
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/* Default font. */
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body {
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font-family: Georgia,serif;
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}
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/* Title font. */
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h1, h2, h3, h4, h5, h6,
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div.title, caption.title,
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thead, p.table.header,
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#toctitle,
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#author, #revnumber, #revdate, #revremark,
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#footer {
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font-family: Arial,Helvetica,sans-serif;
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}
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body {
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margin: 1em 5% 1em 5%;
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}
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a {
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color: blue;
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text-decoration: underline;
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}
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a:visited {
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color: fuchsia;
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}
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em {
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font-style: italic;
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color: navy;
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}
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strong {
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font-weight: bold;
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color: #083194;
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}
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h1, h2, h3, h4, h5, h6 {
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color: #527bbd;
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margin-top: 1.2em;
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margin-bottom: 0.5em;
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line-height: 1.3;
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}
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h1, h2, h3 {
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border-bottom: 2px solid silver;
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}
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h2 {
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padding-top: 0.5em;
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}
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h3 {
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float: left;
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}
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h3 + * {
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clear: left;
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}
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h5 {
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font-size: 1.0em;
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}
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div.sectionbody {
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margin-left: 0;
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}
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hr {
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border: 1px solid silver;
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}
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p {
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margin-top: 0.5em;
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margin-bottom: 0.5em;
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}
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ul, ol, li > p {
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margin-top: 0;
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}
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ul > li { color: #aaa; }
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ul > li > * { color: black; }
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.monospaced, code, pre {
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font-family: "Courier New", Courier, monospace;
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font-size: inherit;
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color: navy;
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padding: 0;
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margin: 0;
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}
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pre {
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white-space: pre-wrap;
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}
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#author {
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color: #527bbd;
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font-weight: bold;
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font-size: 1.1em;
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}
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#email {
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}
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#revnumber, #revdate, #revremark {
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}
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#footer {
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font-size: small;
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border-top: 2px solid silver;
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padding-top: 0.5em;
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margin-top: 4.0em;
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}
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#footer-text {
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float: left;
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padding-bottom: 0.5em;
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}
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#footer-badges {
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float: right;
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padding-bottom: 0.5em;
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}
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#preamble {
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margin-top: 1.5em;
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margin-bottom: 1.5em;
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}
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div.imageblock, div.exampleblock, div.verseblock,
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div.quoteblock, div.literalblock, div.listingblock, div.sidebarblock,
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div.admonitionblock {
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margin-top: 1.0em;
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margin-bottom: 1.5em;
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}
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div.admonitionblock {
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margin-top: 2.0em;
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margin-bottom: 2.0em;
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margin-right: 10%;
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color: #606060;
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}
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div.content { /* Block element content. */
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padding: 0;
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}
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/* Block element titles. */
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div.title, caption.title {
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color: #527bbd;
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font-weight: bold;
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text-align: left;
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margin-top: 1.0em;
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margin-bottom: 0.5em;
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}
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div.title + * {
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margin-top: 0;
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}
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td div.title:first-child {
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margin-top: 0.0em;
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}
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div.content div.title:first-child {
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margin-top: 0.0em;
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}
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div.content + div.title {
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margin-top: 0.0em;
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}
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div.sidebarblock > div.content {
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background: #ffffee;
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border: 1px solid #dddddd;
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border-left: 4px solid #f0f0f0;
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padding: 0.5em;
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}
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div.listingblock > div.content {
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border: 1px solid #dddddd;
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border-left: 5px solid #f0f0f0;
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background: #f8f8f8;
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padding: 0.5em;
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}
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div.quoteblock, div.verseblock {
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padding-left: 1.0em;
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margin-left: 1.0em;
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margin-right: 10%;
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border-left: 5px solid #f0f0f0;
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color: #888;
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}
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div.quoteblock > div.attribution {
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padding-top: 0.5em;
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text-align: right;
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}
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div.verseblock > pre.content {
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font-family: inherit;
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font-size: inherit;
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}
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div.verseblock > div.attribution {
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padding-top: 0.75em;
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text-align: left;
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}
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/* DEPRECATED: Pre version 8.2.7 verse style literal block. */
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div.verseblock + div.attribution {
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text-align: left;
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}
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div.admonitionblock .icon {
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vertical-align: top;
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font-size: 1.1em;
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font-weight: bold;
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text-decoration: underline;
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color: #527bbd;
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padding-right: 0.5em;
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}
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div.admonitionblock td.content {
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padding-left: 0.5em;
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border-left: 3px solid #dddddd;
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}
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div.exampleblock > div.content {
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border-left: 3px solid #dddddd;
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padding-left: 0.5em;
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}
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div.imageblock div.content { padding-left: 0; }
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span.image img { border-style: none; vertical-align: text-bottom; }
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a.image:visited { color: white; }
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dl {
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margin-top: 0.8em;
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margin-bottom: 0.8em;
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}
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dt {
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margin-top: 0.5em;
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margin-bottom: 0;
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font-style: normal;
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color: navy;
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}
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dd > *:first-child {
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margin-top: 0.1em;
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}
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ul, ol {
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list-style-position: outside;
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}
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ol.arabic {
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list-style-type: decimal;
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}
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ol.loweralpha {
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list-style-type: lower-alpha;
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}
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ol.upperalpha {
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list-style-type: upper-alpha;
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}
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ol.lowerroman {
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list-style-type: lower-roman;
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}
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ol.upperroman {
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list-style-type: upper-roman;
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}
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div.compact ul, div.compact ol,
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div.compact p, div.compact p,
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div.compact div, div.compact div {
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margin-top: 0.1em;
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margin-bottom: 0.1em;
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}
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tfoot {
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font-weight: bold;
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}
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td > div.verse {
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white-space: pre;
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}
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div.hdlist {
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margin-top: 0.8em;
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margin-bottom: 0.8em;
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}
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div.hdlist tr {
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padding-bottom: 15px;
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}
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dt.hdlist1.strong, td.hdlist1.strong {
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font-weight: bold;
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}
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td.hdlist1 {
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vertical-align: top;
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font-style: normal;
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padding-right: 0.8em;
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color: navy;
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}
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td.hdlist2 {
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vertical-align: top;
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}
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div.hdlist.compact tr {
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margin: 0;
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padding-bottom: 0;
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}
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.comment {
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background: yellow;
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}
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.footnote, .footnoteref {
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font-size: 0.8em;
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}
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span.footnote, span.footnoteref {
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vertical-align: super;
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}
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#footnotes {
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margin: 20px 0 20px 0;
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padding: 7px 0 0 0;
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}
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#footnotes div.footnote {
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margin: 0 0 5px 0;
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}
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#footnotes hr {
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border: none;
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border-top: 1px solid silver;
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height: 1px;
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text-align: left;
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margin-left: 0;
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width: 20%;
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min-width: 100px;
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}
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div.colist td {
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padding-right: 0.5em;
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padding-bottom: 0.3em;
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vertical-align: top;
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}
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div.colist td img {
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margin-top: 0.3em;
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}
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@media print {
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#footer-badges { display: none; }
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}
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#toc {
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margin-bottom: 2.5em;
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}
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#toctitle {
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color: #527bbd;
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font-size: 1.1em;
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font-weight: bold;
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margin-top: 1.0em;
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margin-bottom: 0.1em;
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}
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div.toclevel0, div.toclevel1, div.toclevel2, div.toclevel3, div.toclevel4 {
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margin-top: 0;
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margin-bottom: 0;
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}
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div.toclevel2 {
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margin-left: 2em;
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font-size: 0.9em;
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}
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div.toclevel3 {
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margin-left: 4em;
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font-size: 0.9em;
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}
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div.toclevel4 {
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margin-left: 6em;
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font-size: 0.9em;
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}
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span.aqua { color: aqua; }
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span.black { color: black; }
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span.blue { color: blue; }
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span.fuchsia { color: fuchsia; }
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span.gray { color: gray; }
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span.green { color: green; }
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span.lime { color: lime; }
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span.maroon { color: maroon; }
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span.navy { color: navy; }
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span.olive { color: olive; }
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span.purple { color: purple; }
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span.red { color: red; }
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span.silver { color: silver; }
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span.teal { color: teal; }
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span.white { color: white; }
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span.yellow { color: yellow; }
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span.aqua-background { background: aqua; }
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span.black-background { background: black; }
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span.blue-background { background: blue; }
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span.fuchsia-background { background: fuchsia; }
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span.gray-background { background: gray; }
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span.green-background { background: green; }
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span.lime-background { background: lime; }
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span.maroon-background { background: maroon; }
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span.navy-background { background: navy; }
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span.olive-background { background: olive; }
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span.purple-background { background: purple; }
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span.red-background { background: red; }
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span.silver-background { background: silver; }
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span.teal-background { background: teal; }
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span.white-background { background: white; }
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span.yellow-background { background: yellow; }
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span.big { font-size: 2em; }
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span.small { font-size: 0.6em; }
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span.underline { text-decoration: underline; }
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span.overline { text-decoration: overline; }
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span.line-through { text-decoration: line-through; }
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div.unbreakable { page-break-inside: avoid; }
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/*
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* xhtml11 specific
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*
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* */
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div.tableblock {
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margin-top: 1.0em;
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margin-bottom: 1.5em;
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}
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div.tableblock > table {
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border: 3px solid #527bbd;
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}
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thead, p.table.header {
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font-weight: bold;
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color: #527bbd;
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}
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p.table {
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margin-top: 0;
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}
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/* Because the table frame attribute is overridden by CSS in most browsers. */
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div.tableblock > table[frame="void"] {
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border-style: none;
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}
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div.tableblock > table[frame="hsides"] {
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border-left-style: none;
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border-right-style: none;
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}
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div.tableblock > table[frame="vsides"] {
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border-top-style: none;
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border-bottom-style: none;
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}
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/*
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* html5 specific
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*
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* */
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table.tableblock {
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margin-top: 1.0em;
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margin-bottom: 1.5em;
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}
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thead, p.tableblock.header {
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font-weight: bold;
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color: #527bbd;
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}
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p.tableblock {
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margin-top: 0;
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}
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table.tableblock {
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border-width: 3px;
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border-spacing: 0px;
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border-style: solid;
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border-color: #527bbd;
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border-collapse: collapse;
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}
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th.tableblock, td.tableblock {
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border-width: 1px;
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padding: 4px;
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border-style: solid;
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border-color: #527bbd;
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}
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table.tableblock.frame-topbot {
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border-left-style: hidden;
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border-right-style: hidden;
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}
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table.tableblock.frame-sides {
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border-top-style: hidden;
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border-bottom-style: hidden;
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}
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|
table.tableblock.frame-none {
|
|
border-style: hidden;
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}
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th.tableblock.halign-left, td.tableblock.halign-left {
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text-align: left;
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}
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|
th.tableblock.halign-center, td.tableblock.halign-center {
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text-align: center;
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}
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th.tableblock.halign-right, td.tableblock.halign-right {
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text-align: right;
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}
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|
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|
th.tableblock.valign-top, td.tableblock.valign-top {
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vertical-align: top;
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|
}
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|
th.tableblock.valign-middle, td.tableblock.valign-middle {
|
|
vertical-align: middle;
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}
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|
th.tableblock.valign-bottom, td.tableblock.valign-bottom {
|
|
vertical-align: bottom;
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}
|
|
|
|
|
|
/*
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* manpage specific
|
|
*
|
|
* */
|
|
|
|
body.manpage h1 {
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padding-top: 0.5em;
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|
padding-bottom: 0.5em;
|
|
border-top: 2px solid silver;
|
|
border-bottom: 2px solid silver;
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|
}
|
|
body.manpage h2 {
|
|
border-style: none;
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|
}
|
|
body.manpage div.sectionbody {
|
|
margin-left: 3em;
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|
}
|
|
|
|
@media print {
|
|
body.manpage div#toc { display: none; }
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|
}
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|
|
|
|
|
</style>
|
|
<script type="text/javascript">
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|
/*<+'])');
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|
// Function that scans the DOM tree for header elements (the DOM2
|
|
// nodeIterator API would be a better technique but not supported by all
|
|
// browsers).
|
|
var iterate = function (el) {
|
|
for (var i = el.firstChild; i != null; i = i.nextSibling) {
|
|
if (i.nodeType == 1 /* Node.ELEMENT_NODE */) {
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|
var mo = re.exec(i.tagName);
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|
if (mo && (i.getAttribute("class") || i.getAttribute("className")) != "float") {
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result[result.length] = new TocEntry(i, getText(i), mo[1]-1);
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}
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|
iterate(i);
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}
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|
}
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|
}
|
|
iterate(el);
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return result;
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|
}
|
|
|
|
var toc = document.getElementById("toc");
|
|
if (!toc) {
|
|
return;
|
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}
|
|
|
|
// Delete existing TOC entries in case we're reloading the TOC.
|
|
var tocEntriesToRemove = [];
|
|
var i;
|
|
for (i = 0; i < toc.childNodes.length; i++) {
|
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var entry = toc.childNodes[i];
|
|
if (entry.nodeName.toLowerCase() == 'div'
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&& entry.getAttribute("class")
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&& entry.getAttribute("class").match(/^toclevel/))
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tocEntriesToRemove.push(entry);
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}
|
|
for (i = 0; i < tocEntriesToRemove.length; i++) {
|
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toc.removeChild(tocEntriesToRemove[i]);
|
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}
|
|
|
|
// Rebuild TOC entries.
|
|
var entries = tocEntries(document.getElementById("content"), toclevels);
|
|
for (var i = 0; i < entries.length; ++i) {
|
|
var entry = entries[i];
|
|
if (entry.element.id == "")
|
|
entry.element.id = "_toc_" + i;
|
|
var a = document.createElement("a");
|
|
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// Footnotes generator
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/////////////////////////////////////////////////////////////////////
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|
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|
|
* http://www.brandspankingnew.net/archive/2005/07/format_footnote.html
|
|
*/
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|
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// Because JavaScript has no s (dotall) regex flag.
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note = spans[i].innerHTML.match(/\s*\[([\s\S]*)]\s*/)[1];
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|
|
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|
|
asciidoc.install();
|
|
/*]]>*/
|
|
</script>
|
|
</head>
|
|
<body class="article">
|
|
<div id="header">
|
|
<h1>parse-options API</h1>
|
|
<span id="revdate"></span>
|
|
</div>
|
|
<div id="content">
|
|
<div id="preamble">
|
|
<div class="sectionbody">
|
|
<div class="paragraph"><p>The parse-options API is used to parse and massage options in Git
|
|
and to provide a usage help with consistent look.</p></div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_basics">Basics</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph"><p>The argument vector <code>argv</code>[] may usually contain mandatory or optional
|
|
<em>non-option arguments</em>, e.g. a filename or a branch, <em>options</em>, and
|
|
<em>subcommands</em>.
|
|
Options are optional arguments that start with a dash and
|
|
that allow to change the behavior of a command.</p></div>
|
|
<div class="ulist"><ul>
|
|
<li>
|
|
<p>
|
|
There are basically three types of options:
|
|
<em>boolean</em> options,
|
|
options with (mandatory) <em>arguments</em> and
|
|
options with <em>optional arguments</em>
|
|
(i.e. a boolean option that can be adjusted).
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
There are basically two forms of options:
|
|
<em>Short options</em> consist of one dash (<code>-</code>) and one alphanumeric
|
|
character.
|
|
<em>Long options</em> begin with two dashes (<code>--</code>) and some
|
|
alphanumeric characters.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
Options are case-sensitive.
|
|
Please define <em>lower-case long options</em> only.
|
|
</p>
|
|
</li>
|
|
</ul></div>
|
|
<div class="paragraph"><p>The parse-options API allows:</p></div>
|
|
<div class="ulist"><ul>
|
|
<li>
|
|
<p>
|
|
<em>stuck</em> and <em>separate form</em> of options with arguments.
|
|
<code>-oArg</code> is stuck, <code>-o</code> <code>Arg</code> is separate form.
|
|
<code>--option=Arg</code> is stuck, <code>--option</code> <code>Arg</code> is separate form.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
Long options may be <em>abbreviated</em>, as long as the abbreviation
|
|
is unambiguous.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
Short options may be bundled, e.g. <code>-a</code> <code>-b</code> can be specified as <code>-ab</code>.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
Boolean long options can be <em>negated</em> (or <em>unset</em>) by prepending
|
|
<code>no-</code>, e.g. <code>--no-abbrev</code> instead of <code>--abbrev</code>. Conversely,
|
|
options that begin with <code>no-</code> can be <em>negated</em> by removing it.
|
|
Other long options can be unset (e.g., set string to NULL, set
|
|
integer to 0) by prepending <code>no-</code>.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
Options and non-option arguments can clearly be separated using the <code>--</code>
|
|
option, e.g. <code>-a</code> <code>-b</code> <code>--option</code> <code>--</code> <code>--this-is-a-file</code> indicates that
|
|
<code>--this-is-a-file</code> must not be processed as an option.
|
|
</p>
|
|
</li>
|
|
</ul></div>
|
|
<div class="paragraph"><p>Subcommands are special in a couple of ways:</p></div>
|
|
<div class="ulist"><ul>
|
|
<li>
|
|
<p>
|
|
Subcommands only have long form, and they have no double dash prefix, no
|
|
negated form, and no description, and they don’t take any arguments, and
|
|
can’t be abbreviated.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
There must be exactly one subcommand among the arguments, or zero if the
|
|
command has a default operation mode.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
All arguments following the subcommand are considered to be arguments of
|
|
the subcommand, and, conversely, arguments meant for the subcommand may
|
|
not precede the subcommand.
|
|
</p>
|
|
</li>
|
|
</ul></div>
|
|
<div class="paragraph"><p>Therefore, if the options array contains at least one subcommand and
|
|
<code>parse_options</code>() encounters the first dashless argument, it will either:</p></div>
|
|
<div class="ulist"><ul>
|
|
<li>
|
|
<p>
|
|
stop and return, if that dashless argument is a known subcommand, setting
|
|
<code>value</code> to the function pointer associated with that subcommand, storing
|
|
the name of the subcommand in argv[0], and leaving the rest of the
|
|
arguments unprocessed, or
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
stop and return, if it was invoked with the <code>PARSE_OPT_SUBCOMMAND_OPTIONAL</code>
|
|
flag and that dashless argument doesn’t match any subcommands, leaving
|
|
<code>value</code> unchanged and the rest of the arguments unprocessed, or
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
show error and usage, and abort.
|
|
</p>
|
|
</li>
|
|
</ul></div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_steps_to_parse_options">Steps to parse options</h2>
|
|
<div class="sectionbody">
|
|
<div class="olist arabic"><ol class="arabic">
|
|
<li>
|
|
<p>
|
|
#include "parse-options.h"
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
define a NULL-terminated
|
|
<code>static</code> <code>const</code> <code>char</code> <code>*</code> <code>const</code> <code>builtin_foo_usage</code>[] array
|
|
containing alternative usage strings
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
define <code>builtin_foo_options</code> array as described below
|
|
in section <em>Data Structure</em>.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
in <code>cmd_foo</code>(<code>int</code> <code>argc,</code> <code>const</code> <code>char</code> <code>**argv,</code> <code>const</code> <code>char</code> <code>*prefix</code>)
|
|
call
|
|
</p>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>argc = parse_options(argc, argv, prefix, builtin_foo_options, builtin_foo_usage, flags);</code></pre>
|
|
</div></div>
|
|
<div class="paragraph"><p><code>parse_options</code>() will filter out the processed options of <code>argv</code>[] and leave the
|
|
non-option arguments in <code>argv</code>[].
|
|
<code>argc</code> is updated appropriately because of the assignment.</p></div>
|
|
<div class="paragraph"><p>You can also pass NULL instead of a usage array as the fifth parameter of
|
|
parse_options(), to avoid displaying a help screen with usage info and
|
|
option list. This should only be done if necessary, e.g. to implement
|
|
a limited parser for only a subset of the options that needs to be run
|
|
before the full parser, which in turn shows the full help message.</p></div>
|
|
<div class="paragraph"><p>Flags are the bitwise-or of:</p></div>
|
|
<div class="dlist"><dl>
|
|
<dt class="hdlist1">
|
|
<code>PARSE_OPT_KEEP_DASHDASH</code>
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
Keep the <code>--</code> that usually separates options from
|
|
non-option arguments.
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<code>PARSE_OPT_STOP_AT_NON_OPTION</code>
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
Usually the whole argument vector is massaged and reordered.
|
|
Using this flag, processing is stopped at the first non-option
|
|
argument.
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<code>PARSE_OPT_KEEP_ARGV0</code>
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
Keep the first argument, which contains the program name. It’s
|
|
removed from argv[] by default.
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<code>PARSE_OPT_KEEP_UNKNOWN_OPT</code>
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
Keep unknown options instead of erroring out. This doesn’t
|
|
work for all combinations of arguments as users might expect
|
|
it to do. E.g. if the first argument in <code>--unknown</code> <code>--known</code>
|
|
takes a value (which we can’t know), the second one is
|
|
mistakenly interpreted as a known option. Similarly, if
|
|
<code>PARSE_OPT_STOP_AT_NON_OPTION</code> is set, the second argument in
|
|
<code>--unknown</code> <code>value</code> will be mistakenly interpreted as a
|
|
non-option, not as a value belonging to the unknown option,
|
|
the parser early. That’s why parse_options() errors out if
|
|
both options are set.
|
|
Note that non-option arguments are always kept, even without
|
|
this flag.
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<code>PARSE_OPT_NO_INTERNAL_HELP</code>
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
By default, parse_options() handles <code>-h</code>, <code>--help</code> and
|
|
<code>--help-all</code> internally, by showing a help screen. This option
|
|
turns it off and allows one to add custom handlers for these
|
|
options, or to just leave them unknown.
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<code>PARSE_OPT_SUBCOMMAND_OPTIONAL</code>
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
Don’t error out when no subcommand is specified.
|
|
</p>
|
|
</dd>
|
|
</dl></div>
|
|
</li>
|
|
</ol></div>
|
|
<div class="paragraph"><p>Note that <code>PARSE_OPT_STOP_AT_NON_OPTION</code> is incompatible with subcommands;
|
|
while <code>PARSE_OPT_KEEP_DASHDASH</code> and <code>PARSE_OPT_KEEP_UNKNOWN_OPT</code> can only be
|
|
used with subcommands when combined with <code>PARSE_OPT_SUBCOMMAND_OPTIONAL</code>.</p></div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_data_structure">Data Structure</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph"><p>The main data structure is an array of the <code>option</code> struct,
|
|
say <code>static</code> <code>struct</code> <code>option</code> <code>builtin_add_options</code>[].
|
|
There are some macros to easily define options:</p></div>
|
|
<div class="dlist"><dl>
|
|
<dt class="hdlist1">
|
|
<code>OPT__ABBREV</code>(&int_var)
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
Add <code>--abbrev</code>[<code>=</code><em><n></em>].
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<code>OPT__COLOR</code>(&int_var, <code>description</code>)
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
Add <code>--color</code>[<code>=</code><em><when></em>] and <code>--no-color</code>.
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<code>OPT__DRY_RUN</code>(&int_var, <code>description</code>)
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
Add <code>-n,</code> <code>--dry-run</code>.
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<code>OPT__FORCE</code>(&int_var, <code>description</code>)
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
Add <code>-f,</code> <code>--force</code>.
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<code>OPT__QUIET</code>(&int_var, <code>description</code>)
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
Add <code>-q,</code> <code>--quiet</code>.
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<code>OPT__VERBOSE</code>(&int_var, <code>description</code>)
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
Add <code>-v,</code> <code>--verbose</code>.
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<code>OPT_GROUP</code>(<code>description</code>)
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
Start an option group. <code>description</code> is a short string that
|
|
describes the group or an empty string.
|
|
Start the description with an upper-case letter.
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<code>OPT_BOOL</code>(<code>short,</code> <code>long,</code> &int_var, <code>description</code>)
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
Introduce a boolean option. <code>int_var</code> is set to one with
|
|
<code>--option</code> and set to zero with <code>--no-option</code>.
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<code>OPT_COUNTUP</code>(<code>short,</code> <code>long,</code> &int_var, <code>description</code>)
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
Introduce a count-up option.
|
|
Each use of <code>--option</code> increments <code>int_var</code>, starting from zero
|
|
(even if initially negative), and <code>--no-option</code> resets it to
|
|
zero. To determine if <code>--option</code> or <code>--no-option</code> was encountered at
|
|
all, initialize <code>int_var</code> to a negative value, and if it is still
|
|
negative after parse_options(), then neither <code>--option</code> nor
|
|
<code>--no-option</code> was seen.
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<code>OPT_BIT</code>(<code>short,</code> <code>long,</code> &int_var, <code>description,</code> <code>mask</code>)
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
Introduce a boolean option.
|
|
If used, <code>int_var</code> is bitwise-ored with <code>mask</code>.
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<code>OPT_NEGBIT</code>(<code>short,</code> <code>long,</code> &int_var, <code>description,</code> <code>mask</code>)
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
Introduce a boolean option.
|
|
If used, <code>int_var</code> is bitwise-anded with the inverted <code>mask</code>.
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<code>OPT_SET_INT</code>(<code>short,</code> <code>long,</code> &int_var, <code>description,</code> <code>integer</code>)
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
Introduce an integer option.
|
|
<code>int_var</code> is set to <code>integer</code> with <code>--option</code>, and
|
|
reset to zero with <code>--no-option</code>.
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<code>OPT_STRING</code>(<code>short,</code> <code>long,</code> &str_var, <code>arg_str,</code> <code>description</code>)
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
Introduce an option with string argument.
|
|
The string argument is put into <code>str_var</code>.
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<code>OPT_STRING_LIST</code>(<code>short,</code> <code>long,</code> &struct <code>string_list,</code> <code>arg_str,</code> <code>description</code>)
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
Introduce an option with string argument.
|
|
The string argument is stored as an element in <code>string_list</code>.
|
|
Use of <code>--no-option</code> will clear the list of preceding values.
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<code>OPT_INTEGER</code>(<code>short,</code> <code>long,</code> &int_var, <code>description</code>)
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
Introduce an option with integer argument. The argument must be a
|
|
integer and may include a suffix of <em>k</em>, <em>m</em> or <em>g</em> to
|
|
scale the provided value by 1024, 1024<sup>2 or 1024</sup>3 respectively.
|
|
The scaled value is put into <code>int_var</code>.
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<code>OPT_UNSIGNED</code>(<code>short,</code> <code>long,</code> &unsigned_long_var, <code>description</code>)
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
Introduce an option with an unsigned integer argument. The argument must be a
|
|
non-negative integer and may include a suffix of <em>k</em>, <em>m</em> or <em>g</em> to
|
|
scale the provided value by 1024, 1024<sup>2 or 1024</sup>3 respectively.
|
|
The scaled value is put into <code>unsigned_long_var</code>.
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<code>OPT_EXPIRY_DATE</code>(<code>short,</code> <code>long,</code> &timestamp_t_var, <code>description</code>)
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
Introduce an option with expiry date argument, see <code>parse_expiry_date</code>().
|
|
The timestamp is put into <code>timestamp_t_var</code>.
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<code>OPT_CALLBACK</code>(<code>short,</code> <code>long,</code> &var, <code>arg_str,</code> <code>description,</code> <code>func_ptr</code>)
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
Introduce an option with argument.
|
|
The argument will be fed into the function given by <code>func_ptr</code>
|
|
and the result will be put into <code>var</code>.
|
|
See <em>Option Callbacks</em> below for a more elaborate description.
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<code>OPT_FILENAME</code>(<code>short,</code> <code>long,</code> &var, <code>description</code>)
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
Introduce an option with a filename argument.
|
|
The filename will be prefixed by passing the filename along with
|
|
the prefix argument of <code>parse_options</code>() to <code>prefix_filename</code>().
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<code>OPT_NUMBER_CALLBACK</code>(&var, <code>description,</code> <code>func_ptr</code>)
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
Recognize numerical options like -123 and feed the integer as
|
|
if it was an argument to the function given by <code>func_ptr</code>.
|
|
The result will be put into <code>var</code>. There can be only one such
|
|
option definition. It cannot be negated and it takes no
|
|
arguments. Short options that happen to be digits take
|
|
precedence over it.
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<code>OPT_COLOR_FLAG</code>(<code>short,</code> <code>long,</code> &int_var, <code>description</code>)
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
Introduce an option that takes an optional argument that can
|
|
have one of three values: "always", "never", or "auto". If the
|
|
argument is not given, it defaults to "always". The <code>--no-</code> form
|
|
works like <code>--long=never</code>; it cannot take an argument. If
|
|
"always", set <code>int_var</code> to 1; if "never", set <code>int_var</code> to 0; if
|
|
"auto", set <code>int_var</code> to 1 if stdout is a tty or a pager,
|
|
0 otherwise.
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<code>OPT_NOOP_NOARG</code>(<code>short,</code> <code>long</code>)
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
Introduce an option that has no effect and takes no arguments.
|
|
Use it to hide deprecated options that are still to be recognized
|
|
and ignored silently.
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<code>OPT_PASSTHRU</code>(<code>short,</code> <code>long,</code> &char_var, <code>arg_str,</code> <code>description,</code> <code>flags</code>)
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
Introduce an option that will be reconstructed into a char* string,
|
|
which must be initialized to NULL. This is useful when you need to
|
|
pass the command-line option to another command. Any previous value
|
|
will be overwritten, so this should only be used for options where
|
|
the last one specified on the command line wins.
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<code>OPT_PASSTHRU_ARGV</code>(<code>short,</code> <code>long,</code> &strvec_var, <code>arg_str,</code> <code>description,</code> <code>flags</code>)
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
Introduce an option where all instances of it on the command-line will
|
|
be reconstructed into a strvec. This is useful when you need to
|
|
pass the command-line option, which can be specified multiple times,
|
|
to another command.
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<code>OPT_CMDMODE</code>(<code>short,</code> <code>long,</code> &int_var, <code>description,</code> <code>enum_val</code>)
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
Define an "operation mode" option, only one of which in the same
|
|
group of "operating mode" options that share the same <code>int_var</code>
|
|
can be given by the user. <code>int_var</code> is set to <code>enum_val</code> when the
|
|
option is used, but an error is reported if other "operating mode"
|
|
option has already set its value to the same <code>int_var</code>.
|
|
In new commands consider using subcommands instead.
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<code>OPT_SUBCOMMAND</code>(<code>long,</code> &fn_ptr, <code>subcommand_fn</code>)
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
Define a subcommand. <code>subcommand_fn</code> is put into <code>fn_ptr</code> when
|
|
this subcommand is used.
|
|
</p>
|
|
</dd>
|
|
</dl></div>
|
|
<div class="paragraph"><p>The last element of the array must be <code>OPT_END</code>().</p></div>
|
|
<div class="paragraph"><p>If not stated otherwise, interpret the arguments as follows:</p></div>
|
|
<div class="ulist"><ul>
|
|
<li>
|
|
<p>
|
|
<code>short</code> is a character for the short option
|
|
(e.g. 'e' for <code>-e</code>, use <code>0</code> to omit),
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
<code>long</code> is a string for the long option
|
|
(e.g. "example" for <code>--example</code>, use <code>NULL</code> to omit),
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
<code>int_var</code> is an integer variable,
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
<code>str_var</code> is a string variable (<code>char</code> <code>*</code>),
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
<code>arg_str</code> is the string that is shown as argument
|
|
(e.g. "branch" will result in <em><branch></em>).
|
|
If set to <code>NULL</code>, three dots (...) will be displayed.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
<code>description</code> is a short string to describe the effect of the option.
|
|
It shall begin with a lower-case letter and a full stop (.) shall be
|
|
omitted at the end.
|
|
</p>
|
|
</li>
|
|
</ul></div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_option_callbacks">Option Callbacks</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph"><p>The function must be defined in this form:</p></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>int func(const struct option *opt, const char *arg, int unset)</code></pre>
|
|
</div></div>
|
|
<div class="paragraph"><p>The callback mechanism is as follows:</p></div>
|
|
<div class="ulist"><ul>
|
|
<li>
|
|
<p>
|
|
Inside <code>func</code>, the only interesting member of the structure
|
|
given by <code>opt</code> is the void pointer <code>opt-</code>><code>value</code>.
|
|
<code>*opt-</code>><code>value</code> will be the value that is saved into <code>var</code>, if you
|
|
use <code>OPT_CALLBACK</code>().
|
|
For example, do <code>*</code>(<code>unsigned</code> <code>long</code> <code>*</code>)<code>opt-</code>><code>value</code> <code>=</code> <code>42</code>; to get 42
|
|
into an <code>unsigned</code> <code>long</code> variable.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
Return value <code>0</code> indicates success and non-zero return
|
|
value will invoke <code>usage_with_options</code>() and, thus, die.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
If the user negates the option, <code>arg</code> is <code>NULL</code> and <code>unset</code> is 1.
|
|
</p>
|
|
</li>
|
|
</ul></div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_sophisticated_option_parsing">Sophisticated option parsing</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph"><p>If you need, for example, option callbacks with optional arguments
|
|
or without arguments at all, or if you need other special cases,
|
|
that are not handled by the macros above, you need to specify the
|
|
members of the <code>option</code> structure manually.</p></div>
|
|
<div class="paragraph"><p>This is not covered in this document, but well documented
|
|
in <code>parse-options.h</code> itself.</p></div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_examples">Examples</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph"><p>See <code>test-parse-options.c</code> and
|
|
<code>builtin/add.c</code>,
|
|
<code>builtin/clone.c</code>,
|
|
<code>builtin/commit.c</code>,
|
|
<code>builtin/fetch.c</code>,
|
|
<code>builtin/fsck.c</code>,
|
|
<code>builtin/rm.c</code>
|
|
for real-world examples.</p></div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div id="footnotes"><hr /></div>
|
|
<div id="footer">
|
|
<div id="footer-text">
|
|
Last updated
|
|
2025-08-18 02:18:23 CEST
|
|
</div>
|
|
</div>
|
|
</body>
|
|
</html>
|