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36.html
1218 lines (1044 loc) · 33.7 KB
/
36.html
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<!DOCTYPE html><html><head><meta charset="utf-8"><style>html { font-size: 100%; overflow-y: scroll; -webkit-text-size-adjust: 100%; -ms-text-size-adjust: 100%; }
body{
color:#444;
font-family:Georgia, Palatino, 'Palatino Linotype', Times, 'Times New Roman',
"Hiragino Sans GB", "STXihei", "微软雅黑", serif;
font-size:12px;
line-height:1.5em;
background:#fefefe;
width: 45em;
margin: 10px auto;
padding: 1em;
outline: 1300px solid #FAFAFA;
}
a{ color: #0645ad; text-decoration:none;}
a:visited{ color: #0b0080; }
a:hover{ color: #06e; }
a:active{ color:#faa700; }
a:focus{ outline: thin dotted; }
a:hover, a:active{ outline: 0; }
span.backtick {
border:1px solid #EAEAEA;
border-radius:3px;
background:#F8F8F8;
padding:0 3px 0 3px;
}
::-moz-selection{background:rgba(255,255,0,0.3);color:#000}
::selection{background:rgba(255,255,0,0.3);color:#000}
a::-moz-selection{background:rgba(255,255,0,0.3);color:#0645ad}
a::selection{background:rgba(255,255,0,0.3);color:#0645ad}
p{
margin:1em 0;
}
img{
max-width:100%;
}
h1,h2,h3,h4,h5,h6{
font-weight:normal;
color:#111;
line-height:1em;
}
h4,h5,h6{ font-weight: bold; }
h1{ font-size:2.5em; }
h2{ font-size:2em; border-bottom:1px solid silver; padding-bottom: 5px; }
h3{ font-size:1.5em; }
h4{ font-size:1.2em; }
h5{ font-size:1em; }
h6{ font-size:0.9em; }
blockquote{
color:#666666;
margin:0;
padding-left: 3em;
border-left: 0.5em #EEE solid;
}
hr { display: block; height: 2px; border: 0; border-top: 1px solid #aaa;border-bottom: 1px solid #eee; margin: 1em 0; padding: 0; }
pre , code, kbd, samp {
color: #000;
font-family: monospace;
font-size: 0.88em;
border-radius:3px;
background-color: #F8F8F8;
border: 1px solid #CCC;
}
pre { white-space: pre; white-space: pre-wrap; word-wrap: break-word; padding: 5px 12px;}
pre code { border: 0px !important; padding: 0;}
code { padding: 0 3px 0 3px; }
b, strong { font-weight: bold; }
dfn { font-style: italic; }
ins { background: #ff9; color: #000; text-decoration: none; }
mark { background: #ff0; color: #000; font-style: italic; font-weight: bold; }
sub, sup { font-size: 75%; line-height: 0; position: relative; vertical-align: baseline; }
sup { top: -0.5em; }
sub { bottom: -0.25em; }
ul, ol { margin: 1em 0; padding: 0 0 0 2em; }
li p:last-child { margin:0 }
dd { margin: 0 0 0 2em; }
img { border: 0; -ms-interpolation-mode: bicubic; vertical-align: middle; }
table { border-collapse: collapse; border-spacing: 0; }
td { vertical-align: top; }
@media only screen and (min-width: 480px) {
body{font-size:14px;}
}
@media only screen and (min-width: 768px) {
body{font-size:16px;}
}
@media print {
* { background: transparent !important; color: black !important; filter:none !important; -ms-filter: none !important; }
body{font-size:12pt; max-width:100%; outline:none;}
a, a:visited { text-decoration: underline; }
hr { height: 1px; border:0; border-bottom:1px solid black; }
a[href]:after { content: " (" attr(href) ")"; }
abbr[title]:after { content: " (" attr(title) ")"; }
.ir a:after, a[href^="javascript:"]:after, a[href^="#"]:after { content: ""; }
pre, blockquote { border: 1px solid #999; padding-right: 1em; page-break-inside: avoid; }
tr, img { page-break-inside: avoid; }
img { max-width: 100% !important; }
@page :left { margin: 15mm 20mm 15mm 10mm; }
@page :right { margin: 15mm 10mm 15mm 20mm; }
p, h2, h3 { orphans: 3; widows: 3; }
h2, h3 { page-break-after: avoid; }
}
</style><style>/*
github.com style (c) Vasily Polovnyov <vast@whiteants.net>
*/
pre code {
display: block; padding: 0.5em;
color: #333;
font-size: 14px;
}
pre .comment,
pre .template_comment,
pre .diff .header,
pre .javadoc {
color: #998;
font-style: italic
}
pre .hljs-literal {
color: #2AA198;
font-weight: bold
}
pre .hljs-number {
color: #2AA198;
font-weight: bold
}
/*
purple : #803C8D;
green :#2AA198;
blue:#256EB8;
red:#C7254E;
*/
pre .hljs-built-in {
color: #C7254E;
font-weight: bold
}
pre .hljs-string {
color: #256EB8;
}
pre .hljs-comment {
color: #777;
}
pre .hljs-keyword {
color: #C7254E;
font-weight: bold
}
pre .number,
pre .hexcolor,
pre .ruby .constant {
color: #099;
}
pre .string,
pre .tag .value,
pre .phpdoc,
pre .tex .formula {
color: #d14
}
pre .title,
pre .id,
pre .coffeescript .params,
pre .scss .preprocessor {
color: #900;
font-weight: bold
}
pre .javascript .title,
pre .lisp .title,
pre .clojure .title,
pre .subst {
font-weight: normal
}
pre .class .title,
pre .haskell .type,
pre .vhdl .literal,
pre .tex .command {
color: #458;
font-weight: bold
}
pre .tag,
pre .tag .title,
pre .rules .property,
pre .django .tag .keyword {
color: #000080;
font-weight: normal
}
pre .attribute,
pre .variable,
pre .lisp .body {
color: #008080
}
pre .regexp {
color: #009926
}
pre .class {
color: #458;
font-weight: bold
}
pre .symbol,
pre .ruby .symbol .string,
pre .lisp .keyword,
pre .tex .special,
pre .prompt {
color: #990073
}
pre .built_in,
pre .lisp .title,
pre .clojure .built_in {
color: #0086b3
}
pre .preprocessor,
pre .pi,
pre .doctype,
pre .shebang,
pre .cdata {
color: #999;
font-weight: bold
}
pre .deletion {
background: #fdd
}
pre .addition {
background: #dfd
}
pre .diff .change {
background: #0086b3
}
pre .chunk {
color: #aaa
}</style><script>/*
Syntax highlighting with language autodetection.
http://highlightjs.org/
*/
hljs = new (function() {
/* Utility functions */
function escape(value) {
return value.replace(/&/gm, '&').replace(/</gm, '<').replace(/>/gm, '>');
}
function tag(node) {
return node.nodeName.toLowerCase();
}
function testRe(re, lexeme) {
var match = re && re.exec(lexeme);
return match && match.index == 0;
}
function blockText(block) {
return Array.prototype.map.call(block.childNodes, function(node) {
if (node.nodeType == 3) {
return options.useBR ? node.nodeValue.replace(/\n/g, '') : node.nodeValue;
}
if (tag(node) == 'br') {
return '\n';
}
return blockText(node);
}).join('');
}
function blockLanguage(block) {
var classes = (block.className + ' ' + (block.parentNode ? block.parentNode.className : '')).split(/\s+/);
classes = classes.map(function(c) {return c.replace(/^language-/, '');});
return classes.filter(function(c) {return getLanguage(c) || c == 'no-highlight';})[0];
}
function inherit(parent, obj) {
var result = {};
for (var key in parent)
result[key] = parent[key];
if (obj)
for (var key in obj)
result[key] = obj[key];
return result;
};
/* Stream merging */
function nodeStream(node) {
var result = [];
(function _nodeStream(node, offset) {
for (var child = node.firstChild; child; child = child.nextSibling) {
if (child.nodeType == 3)
offset += child.nodeValue.length;
else if (tag(child) == 'br')
offset += 1;
else if (child.nodeType == 1) {
result.push({
event: 'start',
offset: offset,
node: child
});
offset = _nodeStream(child, offset);
result.push({
event: 'stop',
offset: offset,
node: child
});
}
}
return offset;
})(node, 0);
return result;
}
function mergeStreams(original, highlighted, value) {
var processed = 0;
var result = '';
var nodeStack = [];
function selectStream() {
if (!original.length || !highlighted.length) {
return original.length ? original : highlighted;
}
if (original[0].offset != highlighted[0].offset) {
return (original[0].offset < highlighted[0].offset) ? original : highlighted;
}
/*
To avoid starting the stream just before it should stop the order is
ensured that original always starts first and closes last:
if (event1 == 'start' && event2 == 'start')
return original;
if (event1 == 'start' && event2 == 'stop')
return highlighted;
if (event1 == 'stop' && event2 == 'start')
return original;
if (event1 == 'stop' && event2 == 'stop')
return highlighted;
... which is collapsed to:
*/
return highlighted[0].event == 'start' ? original : highlighted;
}
function open(node) {
function attr_str(a) {return ' ' + a.nodeName + '="' + escape(a.value) + '"';}
result += '<' + tag(node) + Array.prototype.map.call(node.attributes, attr_str).join('') + '>';
}
function close(node) {
result += '</' + tag(node) + '>';
}
function render(event) {
(event.event == 'start' ? open : close)(event.node);
}
while (original.length || highlighted.length) {
var stream = selectStream();
result += escape(value.substr(processed, stream[0].offset - processed));
processed = stream[0].offset;
if (stream == original) {
/*
On any opening or closing tag of the original markup we first close
the entire highlighted node stack, then render the original tag along
with all the following original tags at the same offset and then
reopen all the tags on the highlighted stack.
*/
nodeStack.reverse().forEach(close);
do {
render(stream.splice(0, 1)[0]);
stream = selectStream();
} while (stream == original && stream.length && stream[0].offset == processed);
nodeStack.reverse().forEach(open);
} else {
if (stream[0].event == 'start') {
nodeStack.push(stream[0].node);
} else {
nodeStack.pop();
}
render(stream.splice(0, 1)[0]);
}
}
return result + escape(value.substr(processed));
}
/* Initialization */
function compileLanguage(language) {
function reStr(re) {
return (re && re.source) || re;
}
function langRe(value, global) {
return RegExp(
reStr(value),
'm' + (language.case_insensitive ? 'i' : '') + (global ? 'g' : '')
);
}
function compileMode(mode, parent) {
if (mode.compiled)
return;
mode.compiled = true;
mode.keywords = mode.keywords || mode.beginKeywords;
if (mode.keywords) {
var compiled_keywords = {};
function flatten(className, str) {
if (language.case_insensitive) {
str = str.toLowerCase();
}
str.split(' ').forEach(function(kw) {
var pair = kw.split('|');
compiled_keywords[pair[0]] = [className, pair[1] ? Number(pair[1]) : 1];
});
}
if (typeof mode.keywords == 'string') { // string
flatten('keyword', mode.keywords);
} else {
Object.keys(mode.keywords).forEach(function (className) {
flatten(className, mode.keywords[className]);
});
}
mode.keywords = compiled_keywords;
}
mode.lexemesRe = langRe(mode.lexemes || /\b[A-Za-z0-9_]+\b/, true);
if (parent) {
if (mode.beginKeywords) {
mode.begin = '\\b(' + mode.beginKeywords.split(' ').join('|') + ')\\b';
}
if (!mode.begin)
mode.begin = /\B|\b/;
mode.beginRe = langRe(mode.begin);
if (!mode.end && !mode.endsWithParent)
mode.end = /\B|\b/;
if (mode.end)
mode.endRe = langRe(mode.end);
mode.terminator_end = reStr(mode.end) || '';
if (mode.endsWithParent && parent.terminator_end)
mode.terminator_end += (mode.end ? '|' : '') + parent.terminator_end;
}
if (mode.illegal)
mode.illegalRe = langRe(mode.illegal);
if (mode.relevance === undefined)
mode.relevance = 1;
if (!mode.contains) {
mode.contains = [];
}
var expanded_contains = [];
mode.contains.forEach(function(c) {
if (c.variants) {
c.variants.forEach(function(v) {expanded_contains.push(inherit(c, v));});
} else {
expanded_contains.push(c == 'self' ? mode : c);
}
});
mode.contains = expanded_contains;
mode.contains.forEach(function(c) {compileMode(c, mode);});
if (mode.starts) {
compileMode(mode.starts, parent);
}
var terminators =
mode.contains.map(function(c) {
return c.beginKeywords ? '\\.?(' + c.begin + ')\\.?' : c.begin;
})
.concat([mode.terminator_end, mode.illegal])
.map(reStr)
.filter(Boolean);
mode.terminators = terminators.length ? langRe(terminators.join('|'), true) : {exec: function(s) {return null;}};
mode.continuation = {};
}
compileMode(language);
}
/*
Core highlighting function. Accepts a language name, or an alias, and a
string with the code to highlight. Returns an object with the following
properties:
- relevance (int)
- value (an HTML string with highlighting markup)
*/
function highlight(name, value, ignore_illegals, continuation) {
function subMode(lexeme, mode) {
for (var i = 0; i < mode.contains.length; i++) {
if (testRe(mode.contains[i].beginRe, lexeme)) {
return mode.contains[i];
}
}
}
function endOfMode(mode, lexeme) {
if (testRe(mode.endRe, lexeme)) {
return mode;
}
if (mode.endsWithParent) {
return endOfMode(mode.parent, lexeme);
}
}
function isIllegal(lexeme, mode) {
return !ignore_illegals && testRe(mode.illegalRe, lexeme);
}
function keywordMatch(mode, match) {
var match_str = language.case_insensitive ? match[0].toLowerCase() : match[0];
return mode.keywords.hasOwnProperty(match_str) && mode.keywords[match_str];
}
function buildSpan(classname, insideSpan, leaveOpen, noPrefix) {
var classPrefix = noPrefix ? '' : options.classPrefix,
openSpan = '<span class="' + classPrefix,
closeSpan = leaveOpen ? '' : '</span>';
openSpan += classname + '">';
return openSpan + insideSpan + closeSpan;
}
function processKeywords() {
var buffer = escape(mode_buffer);
if (!top.keywords)
return buffer;
var result = '';
var last_index = 0;
top.lexemesRe.lastIndex = 0;
var match = top.lexemesRe.exec(buffer);
while (match) {
result += buffer.substr(last_index, match.index - last_index);
var keyword_match = keywordMatch(top, match);
if (keyword_match) {
relevance += keyword_match[1];
result += buildSpan(keyword_match[0], match[0]);
} else {
result += match[0];
}
last_index = top.lexemesRe.lastIndex;
match = top.lexemesRe.exec(buffer);
}
return result + buffer.substr(last_index);
}
function processSubLanguage() {
if (top.subLanguage && !languages[top.subLanguage]) {
return escape(mode_buffer);
}
var result = top.subLanguage ? highlight(top.subLanguage, mode_buffer, true, top.continuation.top) : highlightAuto(mode_buffer);
// Counting embedded language score towards the host language may be disabled
// with zeroing the containing mode relevance. Usecase in point is Markdown that
// allows XML everywhere and makes every XML snippet to have a much larger Markdown
// score.
if (top.relevance > 0) {
relevance += result.relevance;
}
if (top.subLanguageMode == 'continuous') {
top.continuation.top = result.top;
}
return buildSpan(result.language, result.value, false, true);
}
function processBuffer() {
return top.subLanguage !== undefined ? processSubLanguage() : processKeywords();
}
function startNewMode(mode, lexeme) {
var markup = mode.className? buildSpan(mode.className, '', true): '';
if (mode.returnBegin) {
result += markup;
mode_buffer = '';
} else if (mode.excludeBegin) {
result += escape(lexeme) + markup;
mode_buffer = '';
} else {
result += markup;
mode_buffer = lexeme;
}
top = Object.create(mode, {parent: {value: top}});
}
function processLexeme(buffer, lexeme) {
mode_buffer += buffer;
if (lexeme === undefined) {
result += processBuffer();
return 0;
}
var new_mode = subMode(lexeme, top);
if (new_mode) {
result += processBuffer();
startNewMode(new_mode, lexeme);
return new_mode.returnBegin ? 0 : lexeme.length;
}
var end_mode = endOfMode(top, lexeme);
if (end_mode) {
var origin = top;
if (!(origin.returnEnd || origin.excludeEnd)) {
mode_buffer += lexeme;
}
result += processBuffer();
do {
if (top.className) {
result += '</span>';
}
relevance += top.relevance;
top = top.parent;
} while (top != end_mode.parent);
if (origin.excludeEnd) {
result += escape(lexeme);
}
mode_buffer = '';
if (end_mode.starts) {
startNewMode(end_mode.starts, '');
}
return origin.returnEnd ? 0 : lexeme.length;
}
if (isIllegal(lexeme, top))
throw new Error('Illegal lexeme "' + lexeme + '" for mode "' + (top.className || '<unnamed>') + '"');
/*
Parser should not reach this point as all types of lexemes should be caught
earlier, but if it does due to some bug make sure it advances at least one
character forward to prevent infinite looping.
*/
mode_buffer += lexeme;
return lexeme.length || 1;
}
var language = getLanguage(name);
if (!language) {
throw new Error('Unknown language: "' + name + '"');
}
compileLanguage(language);
var top = continuation || language;
var result = '';
for(var current = top; current != language; current = current.parent) {
if (current.className) {
result += buildSpan(current.className, result, true);
}
}
var mode_buffer = '';
var relevance = 0;
try {
var match, count, index = 0;
while (true) {
top.terminators.lastIndex = index;
match = top.terminators.exec(value);
if (!match)
break;
count = processLexeme(value.substr(index, match.index - index), match[0]);
index = match.index + count;
}
processLexeme(value.substr(index));
for(var current = top; current.parent; current = current.parent) { // close dangling modes
if (current.className) {
result += '</span>';
}
};
return {
relevance: relevance,
value: result,
language: name,
top: top
};
} catch (e) {
if (e.message.indexOf('Illegal') != -1) {
return {
relevance: 0,
value: escape(value)
};
} else {
throw e;
}
}
}
/*
Highlighting with language detection. Accepts a string with the code to
highlight. Returns an object with the following properties:
- language (detected language)
- relevance (int)
- value (an HTML string with highlighting markup)
- second_best (object with the same structure for second-best heuristically
detected language, may be absent)
*/
function highlightAuto(text, languageSubset) {
languageSubset = languageSubset || options.languages || Object.keys(languages);
var result = {
relevance: 0,
value: escape(text)
};
var second_best = result;
languageSubset.forEach(function(name) {
if (!getLanguage(name)) {
return;
}
var current = highlight(name, text, false);
current.language = name;
if (current.relevance > second_best.relevance) {
second_best = current;
}
if (current.relevance > result.relevance) {
second_best = result;
result = current;
}
});
if (second_best.language) {
result.second_best = second_best;
}
return result;
}
/*
Post-processing of the highlighted markup:
- replace TABs with something more useful
- replace real line-breaks with '<br>' for non-pre containers
*/
function fixMarkup(value) {
if (options.tabReplace) {
value = value.replace(/^((<[^>]+>|\t)+)/gm, function(match, p1, offset, s) {
return p1.replace(/\t/g, options.tabReplace);
});
}
if (options.useBR) {
value = value.replace(/\n/g, '<br>');
}
return value;
}
/*
Applies highlighting to a DOM node containing code. Accepts a DOM node and
two optional parameters for fixMarkup.
*/
function highlightBlock(block) {
var text = blockText(block);
var language = blockLanguage(block);
if (language == 'no-highlight')
return;
var result = language ? highlight(language, text, true) : highlightAuto(text);
var original = nodeStream(block);
if (original.length) {
var pre = document.createElementNS('http://www.w3.org/1999/xhtml', 'pre');
pre.innerHTML = result.value;
result.value = mergeStreams(original, nodeStream(pre), text);
}
result.value = fixMarkup(result.value);
block.innerHTML = result.value;
block.className += ' hljs ' + (!language && result.language || '');
block.result = {
language: result.language,
re: result.relevance
};
if (result.second_best) {
block.second_best = {
language: result.second_best.language,
re: result.second_best.relevance
};
}
}
var options = {
classPrefix: 'hljs-',
tabReplace: null,
useBR: false,
languages: undefined
};
/*
Updates highlight.js global options with values passed in the form of an object
*/
function configure(user_options) {
options = inherit(options, user_options);
}
/*
Applies highlighting to all <pre><code>..</code></pre> blocks on a page.
*/
function initHighlighting() {
if (initHighlighting.called)
return;
initHighlighting.called = true;
var blocks = document.querySelectorAll('pre code');
Array.prototype.forEach.call(blocks, highlightBlock);
}
/*
Attaches highlighting to the page load event.
*/
function initHighlightingOnLoad() {
addEventListener('DOMContentLoaded', initHighlighting, false);
addEventListener('load', initHighlighting, false);
}
var languages = {};
var aliases = {};
function registerLanguage(name, language) {
var lang = languages[name] = language(this);
if (lang.aliases) {
lang.aliases.forEach(function(alias) {aliases[alias] = name;});
}
}
function getLanguage(name) {
return languages[name] || languages[aliases[name]];
}
/* Interface definition */
this.highlight = highlight;
this.highlightAuto = highlightAuto;
this.fixMarkup = fixMarkup;
this.highlightBlock = highlightBlock;
this.configure = configure;
this.initHighlighting = initHighlighting;
this.initHighlightingOnLoad = initHighlightingOnLoad;
this.registerLanguage = registerLanguage;
this.getLanguage = getLanguage;
this.inherit = inherit;
// Common regexps
this.IDENT_RE = '[a-zA-Z][a-zA-Z0-9_]*';
this.UNDERSCORE_IDENT_RE = '[a-zA-Z_][a-zA-Z0-9_]*';
this.NUMBER_RE = '\\b\\d+(\\.\\d+)?';
this.C_NUMBER_RE = '(\\b0[xX][a-fA-F0-9]+|(\\b\\d+(\\.\\d*)?|\\.\\d+)([eE][-+]?\\d+)?)'; // 0x..., 0..., decimal, float
this.BINARY_NUMBER_RE = '\\b(0b[01]+)'; // 0b...
this.RE_STARTERS_RE = '!|!=|!==|%|%=|&|&&|&=|\\*|\\*=|\\+|\\+=|,|-|-=|/=|/|:|;|<<|<<=|<=|<|===|==|=|>>>=|>>=|>=|>>>|>>|>|\\?|\\[|\\{|\\(|\\^|\\^=|\\||\\|=|\\|\\||~';
// Common modes
this.BACKSLASH_ESCAPE = {
begin: '\\\\[\\s\\S]', relevance: 0
};
this.APOS_STRING_MODE = {
className: 'string',
begin: '\'', end: '\'',
illegal: '\\n',
contains: [this.BACKSLASH_ESCAPE]
};
this.QUOTE_STRING_MODE = {
className: 'string',
begin: '"', end: '"',
illegal: '\\n',
contains: [this.BACKSLASH_ESCAPE]
};
this.C_LINE_COMMENT_MODE = {
className: 'comment',
begin: '//', end: '$'
};
this.C_BLOCK_COMMENT_MODE = {
className: 'comment',
begin: '/\\*', end: '\\*/'
};
this.HASH_COMMENT_MODE = {
className: 'comment',
begin: '#', end: '$'
};
this.NUMBER_MODE = {
className: 'number',
begin: this.NUMBER_RE,
relevance: 0
};
this.C_NUMBER_MODE = {
className: 'number',
begin: this.C_NUMBER_RE,
relevance: 0
};
this.BINARY_NUMBER_MODE = {
className: 'number',
begin: this.BINARY_NUMBER_RE,
relevance: 0
};
this.REGEXP_MODE = {
className: 'regexp',
begin: /\//, end: /\/[gim]*/,
illegal: /\n/,
contains: [
this.BACKSLASH_ESCAPE,
{
begin: /\[/, end: /\]/,
relevance: 0,
contains: [this.BACKSLASH_ESCAPE]
}
]
};
this.TITLE_MODE = {
className: 'title',
begin: this.IDENT_RE,
relevance: 0
};
this.UNDERSCORE_TITLE_MODE = {
className: 'title',
begin: this.UNDERSCORE_IDENT_RE,
relevance: 0
};
})()</script><script>hljs.registerLanguage('hydra', function(hljs){
return {
case_insensitive: false,
keywords: {
keyword: 'for if while in import class as priv gen function return extends do end',
literal: 'false true null',
'built-in': 'super var new'
},
contains: [
{
className: 'string',
begin: '"', end: '"'
},
{
className: 'string',
begin: "'", end: "'"
},
hljs.C_LINE_COMMENT_MODE,
hljs.C_NUMBER_MODE
]
}
});</script><script>hljs.initHighlightingOnLoad();</script><title>HydraSpec</title></head><body><h1 id="hydra">Hydra</h1>
<h2 id="packages">Packages:</h2>
<h3 id="importing-from-packages">Importing From Packages:</h3>
<p>Packages are imported using the <code>import</code> keyword. Each package can be imported seperately or a list of packages can be imported at once</p>
<p>There are three places a package can be imported from. The first is from the <code>std</code> namespace. This houses all of the packages in the standard library. As such, you don’t need to worry about where those files are on your system. The second is from the <code>pkg</code> namespace. These files must be in a specific configurable folder and directory structure which is setup automatically if the built in package manager is used via <code>$ hydra install <pkg name></code>. The third option is a full path to a .hy file or a relative path from the current file to the package file being imported.</p>
<pre><code class="hydra">import std.json, std.http, std.crypto //multiple imports
</code></pre>
<pre><code class="hydra">import std.math //math pkg imported from stdlib
import pkg.socketio //socketio pkg imported from configured
//packages folder
import ./util/utils.hy //utils pkg imported directly from path
</code></pre>
<h3 id="using-imports">Using Imports:</h3>
<p>Packages may be imported in their entirety or their exported classes, functions, and variables may be specifically imported. </p>
<pre><code class="hydra">import std.json //json package imported from stdlib
import std.math.sqrt //sqrt() function imported from the std.math package
import std.sync.WaitGroup //WaitGroup class imported from the std.sync package
import std.os.NUM_CORES //NUM_CORES variable imported from the std.os package
</code></pre>
<p>If a whole package is imported, its functions, classes, and variables are accessed through the package name. If the package is imported from a relative or full path, the package will be able to be accessed through the name of the .hy file without the extension </p>
<pre><code class="hydra">import std.math
import std.sync
import ./util/utils.hy