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<li id="title">
<div class="annotation">
<h1>helpers.coffee</h1>
</div>
</li>
<li id="section-1">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-1">§</a>
</div>
<p>This file contains the common helper functions that we’d like to share among
the <strong>Lexer</strong>, <strong>Rewriter</strong>, and the <strong>Nodes</strong>. Merge objects, flatten
arrays, count characters, that sort of thing.</p>
</div>
</li>
<li id="section-2">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-2">§</a>
</div>
<p>Peek at the beginning of a given string to see if it matches a sequence.</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-built_in">exports</span>.starts = <span class="hljs-function"><span class="hljs-params">(string, literal, start)</span> -></span>
literal <span class="hljs-keyword">is</span> string.substr start, literal.length</pre></div></div>
</li>
<li id="section-3">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-3">§</a>
</div>
<p>Peek at the end of a given string to see if it matches a sequence.</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-built_in">exports</span>.ends = <span class="hljs-function"><span class="hljs-params">(string, literal, back)</span> -></span>
len = literal.length
literal <span class="hljs-keyword">is</span> string.substr string.length - len - (back <span class="hljs-keyword">or</span> <span class="hljs-number">0</span>), len</pre></div></div>
</li>
<li id="section-4">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-4">§</a>
</div>
<p>Repeat a string <code>n</code> times.</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-built_in">exports</span>.repeat = repeat = <span class="hljs-function"><span class="hljs-params">(str, n)</span> -></span></pre></div></div>
</li>
<li id="section-5">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-5">§</a>
</div>
<p>Use clever algorithm to have O(log(n)) string concatenation operations.</p>
</div>
<div class="content"><div class='highlight'><pre> res = <span class="hljs-string">''</span>
<span class="hljs-keyword">while</span> n > <span class="hljs-number">0</span>
res += str <span class="hljs-keyword">if</span> n & <span class="hljs-number">1</span>
n >>>= <span class="hljs-number">1</span>
str += str
res</pre></div></div>
</li>
<li id="section-6">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-6">§</a>
</div>
<p>Trim out all falsy values from an array.</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-built_in">exports</span>.compact = <span class="hljs-function"><span class="hljs-params">(array)</span> -></span>
item <span class="hljs-keyword">for</span> item <span class="hljs-keyword">in</span> array <span class="hljs-keyword">when</span> item</pre></div></div>
</li>
<li id="section-7">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-7">§</a>
</div>
<p>Count the number of occurrences of a string in a string.</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-built_in">exports</span>.count = <span class="hljs-function"><span class="hljs-params">(string, substr)</span> -></span>
num = pos = <span class="hljs-number">0</span>
<span class="hljs-keyword">return</span> <span class="hljs-number">1</span>/<span class="hljs-number">0</span> <span class="hljs-keyword">unless</span> substr.length
num++ <span class="hljs-keyword">while</span> pos = <span class="hljs-number">1</span> + string.indexOf substr, pos
num</pre></div></div>
</li>
<li id="section-8">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-8">§</a>
</div>
<p>Merge objects, returning a fresh copy with attributes from both sides.
Used every time <code>Base#compile</code> is called, to allow properties in the
options hash to propagate down the tree without polluting other branches.</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-built_in">exports</span>.merge = <span class="hljs-function"><span class="hljs-params">(options, overrides)</span> -></span>
extend (extend {}, options), overrides</pre></div></div>
</li>
<li id="section-9">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-9">§</a>
</div>
<p>Extend a source object with the properties of another object (shallow copy).</p>
</div>
<div class="content"><div class='highlight'><pre>extend = <span class="hljs-built_in">exports</span>.extend = <span class="hljs-function"><span class="hljs-params">(object, properties)</span> -></span>
<span class="hljs-keyword">for</span> key, val <span class="hljs-keyword">of</span> properties
object[key] = val
object</pre></div></div>
</li>
<li id="section-10">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-10">§</a>
</div>
<p>Return a flattened version of an array.
Handy for getting a list of <code>children</code> from the nodes.</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-built_in">exports</span>.flatten = flatten = <span class="hljs-function"><span class="hljs-params">(array)</span> -></span>
flattened = []
<span class="hljs-keyword">for</span> element <span class="hljs-keyword">in</span> array
<span class="hljs-keyword">if</span> <span class="hljs-string">'[object Array]'</span> <span class="hljs-keyword">is</span> Object::toString.call element
flattened = flattened.concat flatten element
<span class="hljs-keyword">else</span>
flattened.push element
flattened</pre></div></div>
</li>
<li id="section-11">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-11">§</a>
</div>
<p>Delete a key from an object, returning the value. Useful when a node is
looking for a particular method in an options hash.</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-built_in">exports</span>.del = <span class="hljs-function"><span class="hljs-params">(obj, key)</span> -></span>
val = obj[key]
<span class="hljs-keyword">delete</span> obj[key]
val</pre></div></div>
</li>
<li id="section-12">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-12">§</a>
</div>
<p>Typical Array::some</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-built_in">exports</span>.some = Array::some ? (fn) ->
<span class="hljs-keyword">return</span> <span class="hljs-literal">true</span> <span class="hljs-keyword">for</span> e <span class="hljs-keyword">in</span> this <span class="hljs-keyword">when</span> fn e
<span class="hljs-literal">false</span></pre></div></div>
</li>
<li id="section-13">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-13">§</a>
</div>
<p>Helper function for extracting code from Literate CoffeeScript by stripping
out all non-code blocks, producing a string of CoffeeScript code that can
be compiled “normally.”</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-built_in">exports</span>.invertLiterate = <span class="hljs-function"><span class="hljs-params">(code)</span> -></span>
out = []
blankLine = <span class="hljs-regexp">/^\s*$/</span>
indented = <span class="hljs-regexp">/^[\t ]/</span>
listItemStart = <span class="hljs-regexp">/// ^
(?:\t?|\ {0,3}) <span class="hljs-comment"># Up to one tab, or up to three spaces, or neither;</span>
(?:
[\*\-\+] | <span class="hljs-comment"># followed by `*`, `-` or `+`;</span>
[0-9]{1,9}\. <span class="hljs-comment"># or by an integer up to 9 digits long, followed by a period;</span>
)
[\ \t] <span class="hljs-comment"># followed by a space or a tab.</span>
///</span>
insideComment = <span class="hljs-literal">no</span>
<span class="hljs-keyword">for</span> line <span class="hljs-keyword">in</span> code.split(<span class="hljs-string">'\n'</span>)
<span class="hljs-keyword">if</span> blankLine.test(line)
insideComment = <span class="hljs-literal">no</span>
out.push line
<span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> insideComment <span class="hljs-keyword">or</span> listItemStart.test(line)
insideComment = <span class="hljs-literal">yes</span>
out.push <span class="hljs-string">"# <span class="hljs-subst">#{line}</span>"</span>
<span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> <span class="hljs-keyword">not</span> insideComment <span class="hljs-keyword">and</span> indented.test(line)
out.push line
<span class="hljs-keyword">else</span>
insideComment = <span class="hljs-literal">yes</span>
out.push <span class="hljs-string">"# <span class="hljs-subst">#{line}</span>"</span>
out.join <span class="hljs-string">'\n'</span></pre></div></div>
</li>
<li id="section-14">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-14">§</a>
</div>
<p>Merge two jison-style location data objects together.
If <code>last</code> is not provided, this will simply return <code>first</code>.</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-function"><span class="hljs-title">buildLocationData</span> = <span class="hljs-params">(first, last)</span> -></span>
<span class="hljs-keyword">if</span> <span class="hljs-keyword">not</span> last
first
<span class="hljs-keyword">else</span>
first_line: first.first_line
first_column: first.first_column
last_line: last.last_line
last_column: last.last_column
last_line_exclusive: last.last_line_exclusive
last_column_exclusive: last.last_column_exclusive
range: [
first.range[<span class="hljs-number">0</span>]
last.range[<span class="hljs-number">1</span>]
]</pre></div></div>
</li>
<li id="section-15">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-15">§</a>
</div>
<p>Build a list of all comments attached to tokens.</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-built_in">exports</span>.extractAllCommentTokens = <span class="hljs-function"><span class="hljs-params">(tokens)</span> -></span>
allCommentsObj = {}
<span class="hljs-keyword">for</span> token <span class="hljs-keyword">in</span> tokens <span class="hljs-keyword">when</span> token.comments
<span class="hljs-keyword">for</span> comment <span class="hljs-keyword">in</span> token.comments
commentKey = comment.locationData.range[<span class="hljs-number">0</span>]
allCommentsObj[commentKey] = comment
sortedKeys = <span class="hljs-built_in">Object</span>.keys(allCommentsObj).sort (a, b) -> a - b
<span class="hljs-keyword">for</span> key <span class="hljs-keyword">in</span> sortedKeys
allCommentsObj[key]</pre></div></div>
</li>
<li id="section-16">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-16">§</a>
</div>
<p>Get a lookup hash for a token based on its location data.
Multiple tokens might have the same location hash, but using exclusive
location data distinguishes e.g. zero-length generated tokens from
actual source tokens.</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-function"><span class="hljs-title">buildLocationHash</span> = <span class="hljs-params">(loc)</span> -></span>
<span class="hljs-string">"<span class="hljs-subst">#{loc.range[<span class="hljs-number">0</span>]}</span>-<span class="hljs-subst">#{loc.range[<span class="hljs-number">1</span>]}</span>"</span></pre></div></div>
</li>
<li id="section-17">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-17">§</a>
</div>
<p>Build a dictionary of extra token properties organized by tokens’ locations
used as lookup hashes.</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-built_in">exports</span>.buildTokenDataDictionary = buildTokenDataDictionary = <span class="hljs-function"><span class="hljs-params">(tokens)</span> -></span>
tokenData = {}
<span class="hljs-keyword">for</span> token <span class="hljs-keyword">in</span> tokens <span class="hljs-keyword">when</span> token.comments
tokenHash = buildLocationHash token[<span class="hljs-number">2</span>]</pre></div></div>
</li>
<li id="section-18">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-18">§</a>
</div>
<p>Multiple tokens might have the same location hash, such as the generated
<code>JS</code> tokens added at the start or end of the token stream to hold
comments that start or end a file.</p>
</div>
<div class="content"><div class='highlight'><pre> tokenData[tokenHash] ?= {}
<span class="hljs-keyword">if</span> token.comments <span class="hljs-comment"># `comments` is always an array.</span></pre></div></div>
</li>
<li id="section-19">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-19">§</a>
</div>
<p>For “overlapping” tokens, that is tokens with the same location data
and therefore matching <code>tokenHash</code>es, merge the comments from both/all
tokens together into one array, even if there are duplicate comments;
they will get sorted out later.</p>
</div>
<div class="content"><div class='highlight'><pre> (tokenData[tokenHash].comments ?= []).push token.comments...
tokenData</pre></div></div>
</li>
<li id="section-20">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-20">§</a>
</div>
<p>This returns a function which takes an object as a parameter, and if that
object is an AST node, updates that object’s locationData.
The object is returned either way.</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-built_in">exports</span>.addDataToNode = <span class="hljs-function"><span class="hljs-params">(parserState, firstLocationData, firstValue, lastLocationData, lastValue, forceUpdateLocation = <span class="hljs-literal">yes</span>)</span> -></span>
(obj) -></pre></div></div>
</li>
<li id="section-21">
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<p>Add location data.</p>
</div>
<div class="content"><div class='highlight'><pre> locationData = buildLocationData(firstValue?.locationData ? firstLocationData, lastValue?.locationData ? lastLocationData)
<span class="hljs-keyword">if</span> obj?.updateLocationDataIfMissing? <span class="hljs-keyword">and</span> firstLocationData?
obj.updateLocationDataIfMissing locationData, forceUpdateLocation
<span class="hljs-keyword">else</span>
obj.locationData = locationData</pre></div></div>
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<p>Add comments, building the dictionary of token data if it hasn’t been
built yet.</p>
</div>
<div class="content"><div class='highlight'><pre> parserState.tokenData ?= buildTokenDataDictionary parserState.parser.tokens
<span class="hljs-keyword">if</span> obj.locationData?
objHash = buildLocationHash obj.locationData
<span class="hljs-keyword">if</span> parserState.tokenData[objHash]?.comments?
attachCommentsToNode parserState.tokenData[objHash].comments, obj
obj
<span class="hljs-built_in">exports</span>.attachCommentsToNode = attachCommentsToNode = <span class="hljs-function"><span class="hljs-params">(comments, node)</span> -></span>
<span class="hljs-keyword">return</span> <span class="hljs-keyword">if</span> <span class="hljs-keyword">not</span> comments? <span class="hljs-keyword">or</span> comments.length <span class="hljs-keyword">is</span> <span class="hljs-number">0</span>
node.comments ?= []
node.comments.push comments...</pre></div></div>
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<p>Convert jison location data to a string.
<code>obj</code> can be a token, or a locationData.</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-built_in">exports</span>.locationDataToString = <span class="hljs-function"><span class="hljs-params">(obj)</span> -></span>
<span class="hljs-keyword">if</span> (<span class="hljs-string">"2"</span> <span class="hljs-keyword">of</span> obj) <span class="hljs-keyword">and</span> (<span class="hljs-string">"first_line"</span> <span class="hljs-keyword">of</span> obj[<span class="hljs-number">2</span>]) <span class="hljs-keyword">then</span> locationData = obj[<span class="hljs-number">2</span>]
<span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> <span class="hljs-string">"first_line"</span> <span class="hljs-keyword">of</span> obj <span class="hljs-keyword">then</span> locationData = obj
<span class="hljs-keyword">if</span> locationData
<span class="hljs-string">"<span class="hljs-subst">#{locationData.first_line + <span class="hljs-number">1</span>}</span>:<span class="hljs-subst">#{locationData.first_column + <span class="hljs-number">1</span>}</span>-"</span> +
<span class="hljs-string">"<span class="hljs-subst">#{locationData.last_line + <span class="hljs-number">1</span>}</span>:<span class="hljs-subst">#{locationData.last_column + <span class="hljs-number">1</span>}</span>"</span>
<span class="hljs-keyword">else</span>
<span class="hljs-string">"No location data"</span></pre></div></div>
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<p>Generate a unique anonymous file name so we can distinguish source map cache
entries for any number of anonymous scripts.</p>
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<div class="content"><div class='highlight'><pre><span class="hljs-built_in">exports</span>.anonymousFileName = <span class="hljs-keyword">do</span> ->
n = <span class="hljs-number">0</span>
->
<span class="hljs-string">"<anonymous-<span class="hljs-subst">#{n++}</span>>"</span></pre></div></div>
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<p>A <code>.coffee.md</code> compatible version of <code>basename</code>, that returns the file sans-extension.</p>
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<div class="content"><div class='highlight'><pre><span class="hljs-built_in">exports</span>.baseFileName = <span class="hljs-function"><span class="hljs-params">(file, stripExt = <span class="hljs-literal">no</span>, useWinPathSep = <span class="hljs-literal">no</span>)</span> -></span>
pathSep = <span class="hljs-keyword">if</span> useWinPathSep <span class="hljs-keyword">then</span> <span class="hljs-regexp">/\\|\//</span> <span class="hljs-keyword">else</span> <span class="hljs-regexp">/\//</span>
parts = file.split(pathSep)
file = parts[parts.length - <span class="hljs-number">1</span>]
<span class="hljs-keyword">return</span> file <span class="hljs-keyword">unless</span> stripExt <span class="hljs-keyword">and</span> file.indexOf(<span class="hljs-string">'.'</span>) >= <span class="hljs-number">0</span>
parts = file.split(<span class="hljs-string">'.'</span>)
parts.pop()
parts.pop() <span class="hljs-keyword">if</span> parts[parts.length - <span class="hljs-number">1</span>] <span class="hljs-keyword">is</span> <span class="hljs-string">'coffee'</span> <span class="hljs-keyword">and</span> parts.length > <span class="hljs-number">1</span>
parts.join(<span class="hljs-string">'.'</span>)</pre></div></div>
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<p>Determine if a filename represents a CoffeeScript file.</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-built_in">exports</span>.isCoffee = <span class="hljs-function"><span class="hljs-params">(file)</span> -></span> <span class="hljs-regexp">/\.((lit)?coffee|coffee\.md)$/</span>.test file</pre></div></div>
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<p>Determine if a filename represents a Literate CoffeeScript file.</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-built_in">exports</span>.isLiterate = <span class="hljs-function"><span class="hljs-params">(file)</span> -></span> <span class="hljs-regexp">/\.(litcoffee|coffee\.md)$/</span>.test file</pre></div></div>
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<p>Throws a SyntaxError from a given location.
The error’s <code>toString</code> will return an error message following the “standard”
format <code><filename>:<line>:<col>: <message></code> plus the line with the error and a
marker showing where the error is.</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-built_in">exports</span>.throwSyntaxError = <span class="hljs-function"><span class="hljs-params">(message, location)</span> -></span>
error = <span class="hljs-keyword">new</span> <span class="hljs-built_in">SyntaxError</span> message
error.location = location
error.toString = syntaxErrorToString</pre></div></div>
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<p>Instead of showing the compiler’s stacktrace, show our custom error message
(this is useful when the error bubbles up in Node.js applications that
compile CoffeeScript for example).</p>
</div>
<div class="content"><div class='highlight'><pre> error.stack = error.toString()
<span class="hljs-keyword">throw</span> error</pre></div></div>
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<p>Update a compiler SyntaxError with source code information if it didn’t have
it already.</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-built_in">exports</span>.updateSyntaxError = <span class="hljs-function"><span class="hljs-params">(error, code, filename)</span> -></span></pre></div></div>
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<p>Avoid screwing up the <code>stack</code> property of other errors (i.e. possible bugs).</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">if</span> error.toString <span class="hljs-keyword">is</span> syntaxErrorToString
error.code <span class="hljs-keyword">or</span>= code
error.filename <span class="hljs-keyword">or</span>= filename
error.stack = error.toString()
error
<span class="hljs-function">
<span class="hljs-title">syntaxErrorToString</span> = -></span>
<span class="hljs-keyword">return</span> Error::toString.call @ <span class="hljs-keyword">unless</span> @code <span class="hljs-keyword">and</span> @location
{first_line, first_column, last_line, last_column} = @location
last_line ?= first_line
last_column ?= first_column
<span class="hljs-keyword">if</span> @filename?.startsWith <span class="hljs-string">'<anonymous'</span>
filename = <span class="hljs-string">'[stdin]'</span>
<span class="hljs-keyword">else</span>
filename = @filename <span class="hljs-keyword">or</span> <span class="hljs-string">'[stdin]'</span>
codeLine = @code.split(<span class="hljs-string">'\n'</span>)[first_line]
start = first_column</pre></div></div>
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<p>Show only the first line on multi-line errors.</p>
</div>
<div class="content"><div class='highlight'><pre> end = <span class="hljs-keyword">if</span> first_line <span class="hljs-keyword">is</span> last_line <span class="hljs-keyword">then</span> last_column + <span class="hljs-number">1</span> <span class="hljs-keyword">else</span> codeLine.length
marker = codeLine[...start].replace(<span class="hljs-regexp">/[^\s]/g</span>, <span class="hljs-string">' '</span>) + repeat(<span class="hljs-string">'^'</span>, end - start)</pre></div></div>
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<p>Check to see if we’re running on a color-enabled TTY.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">if</span> process?
colorsEnabled = process.stdout?.isTTY <span class="hljs-keyword">and</span> <span class="hljs-keyword">not</span> process.env?.NODE_DISABLE_COLORS
<span class="hljs-keyword">if</span> @colorful ? colorsEnabled
<span class="hljs-function"> <span class="hljs-title">colorize</span> = <span class="hljs-params">(str)</span> -></span> <span class="hljs-string">"\x1B[1;31m<span class="hljs-subst">#{str}</span>\x1B[0m"</span>
codeLine = codeLine[...start] + colorize(codeLine[start...end]) + codeLine[end..]
marker = colorize marker
<span class="hljs-string">"""
<span class="hljs-subst">#{filename}</span>:<span class="hljs-subst">#{first_line + <span class="hljs-number">1</span>}</span>:<span class="hljs-subst">#{first_column + <span class="hljs-number">1</span>}</span>: error: <span class="hljs-subst">#{@message}</span>
<span class="hljs-subst">#{codeLine}</span>
<span class="hljs-subst">#{marker}</span>
"""</span>
<span class="hljs-built_in">exports</span>.nameWhitespaceCharacter = <span class="hljs-function"><span class="hljs-params">(string)</span> -></span>
<span class="hljs-keyword">switch</span> string
<span class="hljs-keyword">when</span> <span class="hljs-string">' '</span> <span class="hljs-keyword">then</span> <span class="hljs-string">'space'</span>
<span class="hljs-keyword">when</span> <span class="hljs-string">'\n'</span> <span class="hljs-keyword">then</span> <span class="hljs-string">'newline'</span>
<span class="hljs-keyword">when</span> <span class="hljs-string">'\r'</span> <span class="hljs-keyword">then</span> <span class="hljs-string">'carriage return'</span>
<span class="hljs-keyword">when</span> <span class="hljs-string">'\t'</span> <span class="hljs-keyword">then</span> <span class="hljs-string">'tab'</span>
<span class="hljs-keyword">else</span> string
<span class="hljs-built_in">exports</span>.parseNumber = <span class="hljs-function"><span class="hljs-params">(string)</span> -></span>
<span class="hljs-keyword">return</span> <span class="hljs-literal">NaN</span> <span class="hljs-keyword">unless</span> string?
base = <span class="hljs-keyword">switch</span> string.charAt <span class="hljs-number">1</span>
<span class="hljs-keyword">when</span> <span class="hljs-string">'b'</span> <span class="hljs-keyword">then</span> <span class="hljs-number">2</span>
<span class="hljs-keyword">when</span> <span class="hljs-string">'o'</span> <span class="hljs-keyword">then</span> <span class="hljs-number">8</span>
<span class="hljs-keyword">when</span> <span class="hljs-string">'x'</span> <span class="hljs-keyword">then</span> <span class="hljs-number">16</span>
<span class="hljs-keyword">else</span> <span class="hljs-literal">null</span>
<span class="hljs-keyword">if</span> base?
<span class="hljs-built_in">parseInt</span> string[<span class="hljs-number">2.</span>.].replace(<span class="hljs-regexp">/_/g</span>, <span class="hljs-string">''</span>), base
<span class="hljs-keyword">else</span>
<span class="hljs-built_in">parseFloat</span> string.replace(<span class="hljs-regexp">/_/g</span>, <span class="hljs-string">''</span>)
<span class="hljs-built_in">exports</span>.isFunction = <span class="hljs-function"><span class="hljs-params">(obj)</span> -></span> Object::toString.call(obj) <span class="hljs-keyword">is</span> <span class="hljs-string">'[object Function]'</span>
<span class="hljs-built_in">exports</span>.isNumber = isNumber = <span class="hljs-function"><span class="hljs-params">(obj)</span> -></span> Object::toString.call(obj) <span class="hljs-keyword">is</span> <span class="hljs-string">'[object Number]'</span>
<span class="hljs-built_in">exports</span>.isString = isString = <span class="hljs-function"><span class="hljs-params">(obj)</span> -></span> Object::toString.call(obj) <span class="hljs-keyword">is</span> <span class="hljs-string">'[object String]'</span>
<span class="hljs-built_in">exports</span>.isBoolean = isBoolean = <span class="hljs-function"><span class="hljs-params">(obj)</span> -></span> obj <span class="hljs-keyword">is</span> <span class="hljs-literal">yes</span> <span class="hljs-keyword">or</span> obj <span class="hljs-keyword">is</span> <span class="hljs-literal">no</span> <span class="hljs-keyword">or</span> Object::toString.call(obj) <span class="hljs-keyword">is</span> <span class="hljs-string">'[object Boolean]'</span>
<span class="hljs-built_in">exports</span>.isPlainObject = <span class="hljs-function"><span class="hljs-params">(obj)</span> -></span> <span class="hljs-keyword">typeof</span> obj <span class="hljs-keyword">is</span> <span class="hljs-string">'object'</span> <span class="hljs-keyword">and</span> !!obj <span class="hljs-keyword">and</span> <span class="hljs-keyword">not</span> <span class="hljs-built_in">Array</span>.isArray(obj) <span class="hljs-keyword">and</span> <span class="hljs-keyword">not</span> isNumber(obj) <span class="hljs-keyword">and</span> <span class="hljs-keyword">not</span> isString(obj) <span class="hljs-keyword">and</span> <span class="hljs-keyword">not</span> isBoolean(obj)
<span class="hljs-function">
<span class="hljs-title">unicodeCodePointToUnicodeEscapes</span> = <span class="hljs-params">(codePoint)</span> -></span>
<span class="hljs-function"> <span class="hljs-title">toUnicodeEscape</span> = <span class="hljs-params">(val)</span> -></span>
str = val.toString <span class="hljs-number">16</span>
<span class="hljs-string">"\\u<span class="hljs-subst">#{repeat <span class="hljs-string">'0'</span>, <span class="hljs-number">4</span> - str.length}</span><span class="hljs-subst">#{str}</span>"</span>
<span class="hljs-keyword">return</span> toUnicodeEscape(codePoint) <span class="hljs-keyword">if</span> codePoint < <span class="hljs-number">0x10000</span></pre></div></div>
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<p>surrogate pair</p>
</div>
<div class="content"><div class='highlight'><pre> high = <span class="hljs-built_in">Math</span>.floor((codePoint - <span class="hljs-number">0x10000</span>) / <span class="hljs-number">0x400</span>) + <span class="hljs-number">0xD800</span>
low = (codePoint - <span class="hljs-number">0x10000</span>) % <span class="hljs-number">0x400</span> + <span class="hljs-number">0xDC00</span>
<span class="hljs-string">"<span class="hljs-subst">#{toUnicodeEscape(high)}</span><span class="hljs-subst">#{toUnicodeEscape(low)}</span>"</span></pre></div></div>
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<p>Replace <code>\u{...}</code> with <code>\uxxxx[\uxxxx]</code> in regexes without <code>u</code> flag</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-built_in">exports</span>.replaceUnicodeCodePointEscapes = <span class="hljs-function"><span class="hljs-params">(str, {flags, error, delimiter = <span class="hljs-string">''</span>} = {})</span> -></span>
shouldReplace = flags? <span class="hljs-keyword">and</span> <span class="hljs-string">'u'</span> <span class="hljs-keyword">not</span> <span class="hljs-keyword">in</span> flags
str.replace UNICODE_CODE_POINT_ESCAPE, <span class="hljs-function"><span class="hljs-params">(match, escapedBackslash, codePointHex, offset)</span> -></span>
<span class="hljs-keyword">return</span> escapedBackslash <span class="hljs-keyword">if</span> escapedBackslash
codePointDecimal = <span class="hljs-built_in">parseInt</span> codePointHex, <span class="hljs-number">16</span>
<span class="hljs-keyword">if</span> codePointDecimal > <span class="hljs-number">0x10ffff</span>
error <span class="hljs-string">"unicode code point escapes greater than \\u{10ffff} are not allowed"</span>,
offset: offset + delimiter.length
length: codePointHex.length + <span class="hljs-number">4</span>
<span class="hljs-keyword">return</span> match <span class="hljs-keyword">unless</span> shouldReplace
unicodeCodePointToUnicodeEscapes codePointDecimal
UNICODE_CODE_POINT_ESCAPE = <span class="hljs-regexp">///
( \\\\ ) <span class="hljs-comment"># Make sure the escape isn’t escaped.</span>
|
\\u\{ ( [\da-fA-F]+ ) \}
///</span>g</pre></div></div>
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