##// END OF EJS Templates
rust: module policy with importrust...
rust: module policy with importrust We introduce two rust+c module policies and a new `policy.importrust()` that makes use of them. This simple approach provides runtime switching of implementations, which is crucial for the performance measurements such as those Octobus does with ASV. It can also be useful for bug analysis. It also has the advantage of making conditionals in Rust callers more uniform, in particular abstracting over specifics like `demandimport` At this point, the build stays unchanged, with the rust-cpython based `rustext` module being built if HGWITHRUSTEXT=cpython. More transparency for the callers, i.e., just using `policy.importmod` would be a much longer term and riskier effort for the following reasons: 1. It would require to define common module boundaries for the three or four cases (pure, c, rust+ext, cffi) and that is premature with the Rust extension currently under heavy development in areas that are outside the scope of the C extensions. 2. It would imply internal API changes that are not currently wished, as the case of ancestors demonstrates. 3. The lack of data or property-like attributes (tp_member and tp_getset) in current `rust-cpython` makes it impossible to achieve direct transparent replacement of pure Python classes by Rust extension code, meaning that the caller sometimes has to be able to make adjustments or provide additional wrapping.

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style.css
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/*
* Styles for man pages, which match with https://mercurial-scm.org/
*
* Color scheme & layout are borrowed from
* https://mercurial-scm.org/css/styles.css
*
* Some styles are from html4css1.css from Docutils, which is in the
* public domain.
*/
body {
margin: 0;
padding: 0;
font-family: sans-serif;
}
.document {
position: relative; /* be a top of absolute positioning */
margin: 1.5em 1.8em;
padding: 0;
line-height: 1.3;
}
/* layout: toc to right */
#contents {
position: absolute;
right: 0;
top: 0;
width: 26%;
}
/* layout: others to left */
h1.title, h2.subtitle, .section { width: 72%; }
.section .section { width: auto; }
table.docinfo { max-width: 72%; }
/* headings */
h1, h2, .topic-title, .admonition-title {
font-family: "MgOpen Cosmetica", "Lucida Sans Unicode", sans-serif;
font-weight: normal;
}
h1, h2, .topic-title, .admonition-title {
margin: 1em 0 0.5em;
}
h1.title { font-size: 300%; }
h2.subtitle, h1 { font-size: 200%; }
h2, .topic-title, .admonition-title { font-size: 140%; }
/* subtitle starts with lowercase in man pages, but not in HTML */
h2.subtitle:first-letter { text-transform: uppercase; }
/* override first/last margin */
.first, h1.title, h2.subtitle { margin-top: 0 !important; }
.last, .with-subtitle { margin-bottom: 0 !important; }
blockquote, pre, dd .option-list, .field-list {
margin: 0.2em 0 1em 2em;
}
kbd, tt, pre { font-family: monospace; }
dt { font-weight: bold; }
dd { margin-bottom: 0.5em; }
th, td { padding: 0.1em 0.2em; border: 0 none; }
th { font-weight: bold; text-align: left; }
a:link, a:visited { text-decoration: underline; }
a:hover, a:focus { text-decoration: none; }
a:link { color: #00b5f1; }
a:visited { color: #5c9caf; }
a:link.toc-backref, a:visited.toc-backref {
text-decoration: none;
color: inherit; /* NOTE: `inherit' is not supported by IE6 */
}
div.admonition, div.attention, div.caution,
div.danger, div.error, div.hint, div.important,
div.note, div.tip, div.warning {
border-top: 1px #ccc solid;
border-bottom: 1px #ccc solid;
padding: 0.3em 1em;
margin: 1em;
}
div.note {
border-color: #fcc200;
}
/*
* The following styles are from Docutils.
* Please refine if necessary.
*/
table.borderless td, table.borderless th {
/* Override padding for "table.docutils td" with "! important".
The right padding separates the table cells. */
padding: 0 0.5em 0 0 ! important;
}
.hidden {
display: none;
}
blockquote.epigraph {
margin: 2em 5em;
}
div.abstract {
margin: 2em 5em;
}
div.dedication {
margin: 2em 5em;
text-align: center;
font-style: italic;
}
div.figure {
margin-left: 2em;
margin-right: 2em;
}
div.footer, div.header {
clear: both;
font-size: smaller;
}
div.line-block {
display: block;
margin-top: 1em;
margin-bottom: 1em;
}
div.line-block div.line-block {
margin-top: 0;
margin-bottom: 0;
margin-left: 1.5em;
}
div.sidebar {
margin: 0 0 0.5em 1em;
border: medium outset;
padding: 1em;
background-color: #ffffee;
width: 40%;
float: right;
clear: right;
}
div.sidebar p.rubric {
font-family: sans-serif;
font-size: medium;
}
div.system-messages {
margin: 5em;
}
div.system-messages h1 {
color: red;
}
div.system-message {
border: medium outset;
padding: 1em;
}
div.system-message p.system-message-title {
color: red;
font-weight: bold;
}
h1.section-subtitle, h2.section-subtitle, h3.section-subtitle,
h4.section-subtitle, h5.section-subtitle, h6.section-subtitle {
margin-top: 0.4em;
}
hr.docutils {
width: 75%;
}
img.align-left {
clear: left;
}
img.align-right {
clear: right;
}
ol.simple, ul.simple {
margin-bottom: 1em;
}
ol.arabic {
list-style: decimal;
}
ol.loweralpha {
list-style: lower-alpha;
}
ol.upperalpha {
list-style: upper-alpha;
}
ol.lowerroman {
list-style: lower-roman;
}
ol.upperroman {
list-style: upper-roman;
}
p.attribution {
text-align: right;
margin-left: 50%;
}
p.caption {
font-style: italic;
}
p.credits {
font-style: italic;
font-size: smaller;
}
p.label {
white-space: nowrap;
}
p.rubric {
font-weight: bold;
font-size: larger;
color: maroon;
text-align: center;
}
pre.address {
margin-bottom: 0;
margin-top: 0;
font-family: serif;
font-size: 100%;
}
pre.literal-block, pre.doctest-block {
margin-left: 2em;
margin-right: 2em;
}
span.classifier {
font-family: sans-serif;
font-style: oblique;
}
span.classifier-delimiter {
font-family: sans-serif;
font-weight: bold;
}
span.interpreted {
font-family: sans-serif;
}
span.option {
white-space: nowrap;
}
span.pre {
white-space: pre;
}
span.problematic {
color: red;
}
span.section-subtitle {
/* font-size relative to parent (h1..h6 element) */
font-size: 80%;
}
table.citation {
border-left: solid 1px gray;
margin-left: 1px;
}
table.footnote {
border-left: solid 1px black;
margin-left: 1px;
}
h1 tt.docutils, h2 tt.docutils, h3 tt.docutils,
h4 tt.docutils, h5 tt.docutils, h6 tt.docutils {
font-size: 100%;
}
ul.auto-toc {
list-style-type: none;
}
div.contents.local {
-moz-column-width: 10em;
-moz-column-gap: 1em;
-webkit-column-width: 10em;
-webkit-column-gap: 1em;
}