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<!DOCTYPE html>
<html>
<head>
<title>rewriter.coffee</title>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<meta name="viewport" content="width=device-width, target-densitydpi=160dpi, initial-scale=1.0; maximum-scale=1.0; user-scalable=0;">
<link rel="stylesheet" media="all" href="docco.css" />
</head>
<body>
<div id="container">
<div id="background"></div>
<ul id="jump_to">
<li>
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<ul class="sections">
<li id="title">
<div class="annotation">
<h1>rewriter.coffee</h1>
</div>
</li>
<li id="section-1">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-1">§</a>
</div>
<p>The CoffeeScript language has a good deal of optional syntax, implicit syntax,
and shorthand syntax. This can greatly complicate a grammar and bloat
the resulting parse table. Instead of making the parser handle it all, we take
a series of passes over the token stream, using this <strong>Rewriter</strong> to convert
shorthand into the unambiguous long form, add implicit indentation and
parentheses, and generally clean things up.</p>
</div>
<div class="content"><div class='highlight'><pre>
{throwSyntaxError, extractAllCommentTokens} = <span class="hljs-built_in">require</span> <span class="hljs-string">'./helpers'</span></pre></div></div>
</li>
<li id="section-2">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-2">§</a>
</div>
<p>Move attached comments from one token to another.</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-function"><span class="hljs-title">moveComments</span> = <span class="hljs-params">(fromToken, toToken)</span> -></span>
<span class="hljs-keyword">return</span> <span class="hljs-keyword">unless</span> fromToken.comments
<span class="hljs-keyword">if</span> toToken.comments <span class="hljs-keyword">and</span> toToken.comments.length <span class="hljs-keyword">isnt</span> <span class="hljs-number">0</span>
unshiftedComments = []
<span class="hljs-keyword">for</span> comment <span class="hljs-keyword">in</span> fromToken.comments
<span class="hljs-keyword">if</span> comment.unshift
unshiftedComments.push comment
<span class="hljs-keyword">else</span>
toToken.comments.push comment
toToken.comments = unshiftedComments.concat toToken.comments
<span class="hljs-keyword">else</span>
toToken.comments = fromToken.comments
<span class="hljs-keyword">delete</span> fromToken.comments</pre></div></div>
</li>
<li id="section-3">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-3">§</a>
</div>
<p>Create a generated token: one that exists due to a use of implicit syntax.
Optionally have this new token take the attached comments from another token.</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-function"><span class="hljs-title">generate</span> = <span class="hljs-params">(tag, value, origin, commentsToken)</span> -></span>
token = [tag, value]
token.generated = <span class="hljs-literal">yes</span>
token.origin = origin <span class="hljs-keyword">if</span> origin
moveComments commentsToken, token <span class="hljs-keyword">if</span> commentsToken
token</pre></div></div>
</li>
<li id="section-4">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-4">§</a>
</div>
<p>The <strong>Rewriter</strong> class is used by the <a href="lexer.html">Lexer</a>, directly against
its internal array of tokens.</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-built_in">exports</span>.Rewriter = <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Rewriter</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>Rewrite the token stream in multiple passes, one logical filter at
a time. This could certainly be changed into a single pass through the
stream, with a big ol’ efficient switch, but it’s much nicer to work with
like this. The order of these passes matters—indentation must be
corrected before implicit parentheses can be wrapped around blocks of code.</p>
</div>
<div class="content"><div class='highlight'><pre> rewrite: <span class="hljs-function"><span class="hljs-params">(@tokens)</span> -></span></pre></div></div>
</li>
<li id="section-6">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-6">§</a>
</div>
<p>Set environment variable <code>DEBUG_TOKEN_STREAM</code> to <code>true</code> to output token
debugging info. Also set <code>DEBUG_REWRITTEN_TOKEN_STREAM</code> to <code>true</code> to
output the token stream after it has been rewritten by this file.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">if</span> process?.env?.DEBUG_TOKEN_STREAM
console.log <span class="hljs-string">'Initial token stream:'</span> <span class="hljs-keyword">if</span> process.env.DEBUG_REWRITTEN_TOKEN_STREAM
console.log (t[<span class="hljs-number">0</span>] + <span class="hljs-string">'/'</span> + t[<span class="hljs-number">1</span>] + (<span class="hljs-keyword">if</span> t.comments <span class="hljs-keyword">then</span> <span class="hljs-string">'*'</span> <span class="hljs-keyword">else</span> <span class="hljs-string">''</span>) <span class="hljs-keyword">for</span> t <span class="hljs-keyword">in</span> @tokens).join <span class="hljs-string">' '</span>
@removeLeadingNewlines()
@closeOpenCalls()
@closeOpenIndexes()
@normalizeLines()
@tagPostfixConditionals()
@addImplicitBracesAndParens()
@rescueStowawayComments()
@addLocationDataToGeneratedTokens()
@enforceValidJSXAttributes()
@fixIndentationLocationData()
@exposeTokenDataToGrammar()
<span class="hljs-keyword">if</span> process?.env?.DEBUG_REWRITTEN_TOKEN_STREAM
console.log <span class="hljs-string">'Rewritten token stream:'</span> <span class="hljs-keyword">if</span> process.env.DEBUG_TOKEN_STREAM
console.log (t[<span class="hljs-number">0</span>] + <span class="hljs-string">'/'</span> + t[<span class="hljs-number">1</span>] + (<span class="hljs-keyword">if</span> t.comments <span class="hljs-keyword">then</span> <span class="hljs-string">'*'</span> <span class="hljs-keyword">else</span> <span class="hljs-string">''</span>) <span class="hljs-keyword">for</span> t <span class="hljs-keyword">in</span> @tokens).join <span class="hljs-string">' '</span>
@tokens</pre></div></div>
</li>
<li id="section-7">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-7">§</a>
</div>
<p>Rewrite the token stream, looking one token ahead and behind.
Allow the return value of the block to tell us how many tokens to move
forwards (or backwards) in the stream, to make sure we don’t miss anything
as tokens are inserted and removed, and the stream changes length under
our feet.</p>
</div>
<div class="content"><div class='highlight'><pre> scanTokens: <span class="hljs-function"><span class="hljs-params">(block)</span> -></span>
{tokens} = this
i = <span class="hljs-number">0</span>
i += block.call this, token, i, tokens <span class="hljs-keyword">while</span> token = tokens[i]
<span class="hljs-literal">true</span>
detectEnd: <span class="hljs-function"><span class="hljs-params">(i, condition, action, opts = {})</span> -></span>
{tokens} = this
levels = <span class="hljs-number">0</span>
<span class="hljs-keyword">while</span> token = tokens[i]
<span class="hljs-keyword">return</span> action.call this, token, i <span class="hljs-keyword">if</span> levels <span class="hljs-keyword">is</span> <span class="hljs-number">0</span> <span class="hljs-keyword">and</span> condition.call this, token, i
<span class="hljs-keyword">if</span> token[<span class="hljs-number">0</span>] <span class="hljs-keyword">in</span> EXPRESSION_START
levels += <span class="hljs-number">1</span>
<span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> token[<span class="hljs-number">0</span>] <span class="hljs-keyword">in</span> EXPRESSION_END
levels -= <span class="hljs-number">1</span>
<span class="hljs-keyword">if</span> levels < <span class="hljs-number">0</span>
<span class="hljs-keyword">return</span> <span class="hljs-keyword">if</span> opts.returnOnNegativeLevel
<span class="hljs-keyword">return</span> action.call this, token, i
i += <span class="hljs-number">1</span>
i - <span class="hljs-number">1</span></pre></div></div>
</li>
<li id="section-8">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-8">§</a>
</div>
<p>Leading newlines would introduce an ambiguity in the grammar, so we
dispatch them here.</p>
</div>
<div class="content"><div class='highlight'><pre> removeLeadingNewlines: <span class="hljs-function">-></span></pre></div></div>
</li>
<li id="section-9">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-9">§</a>
</div>
<p>Find the index of the first non-<code>TERMINATOR</code> token.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">break</span> <span class="hljs-keyword">for</span> [tag], i <span class="hljs-keyword">in</span> @tokens <span class="hljs-keyword">when</span> tag <span class="hljs-keyword">isnt</span> <span class="hljs-string">'TERMINATOR'</span>
<span class="hljs-keyword">return</span> <span class="hljs-keyword">if</span> i <span class="hljs-keyword">is</span> <span class="hljs-number">0</span></pre></div></div>
</li>
<li id="section-10">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-10">§</a>
</div>
<p>If there are any comments attached to the tokens we’re about to discard,
shift them forward to what will become the new first token.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">for</span> leadingNewlineToken <span class="hljs-keyword">in</span> @tokens[<span class="hljs-number">0.</span>..i]
moveComments leadingNewlineToken, @tokens[i]</pre></div></div>
</li>
<li id="section-11">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-11">§</a>
</div>
<p>Discard all the leading newline tokens.</p>
</div>
<div class="content"><div class='highlight'><pre> @tokens.splice <span class="hljs-number">0</span>, i</pre></div></div>
</li>
<li id="section-12">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-12">§</a>
</div>
<p>The lexer has tagged the opening parenthesis of a method call. Match it with
its paired close.</p>
</div>
<div class="content"><div class='highlight'><pre> closeOpenCalls: <span class="hljs-function">-></span>
<span class="hljs-function"> <span class="hljs-title">condition</span> = <span class="hljs-params">(token, i)</span> -></span>
token[<span class="hljs-number">0</span>] <span class="hljs-keyword">in</span> [<span class="hljs-string">')'</span>, <span class="hljs-string">'CALL_END'</span>]
<span class="hljs-function">
<span class="hljs-title">action</span> = <span class="hljs-params">(token, i)</span> -></span>
token[<span class="hljs-number">0</span>] = <span class="hljs-string">'CALL_END'</span>
@scanTokens (token, i) ->
@detectEnd i + <span class="hljs-number">1</span>, condition, action <span class="hljs-keyword">if</span> token[<span class="hljs-number">0</span>] <span class="hljs-keyword">is</span> <span class="hljs-string">'CALL_START'</span>
<span class="hljs-number">1</span></pre></div></div>
</li>
<li id="section-13">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-13">§</a>
</div>
<p>The lexer has tagged the opening bracket of an indexing operation call.
Match it with its paired close.</p>
</div>
<div class="content"><div class='highlight'><pre> closeOpenIndexes: <span class="hljs-function">-></span>
startToken = <span class="hljs-literal">null</span>
<span class="hljs-function"> <span class="hljs-title">condition</span> = <span class="hljs-params">(token, i)</span> -></span>
token[<span class="hljs-number">0</span>] <span class="hljs-keyword">in</span> [<span class="hljs-string">']'</span>, <span class="hljs-string">'INDEX_END'</span>]
<span class="hljs-function">
<span class="hljs-title">action</span> = <span class="hljs-params">(token, i)</span> -></span>
<span class="hljs-keyword">if</span> @tokens.length >= i <span class="hljs-keyword">and</span> @tokens[i + <span class="hljs-number">1</span>][<span class="hljs-number">0</span>] <span class="hljs-keyword">is</span> <span class="hljs-string">':'</span>
startToken[<span class="hljs-number">0</span>] = <span class="hljs-string">'['</span>
token[<span class="hljs-number">0</span>] = <span class="hljs-string">']'</span>
<span class="hljs-keyword">else</span>
token[<span class="hljs-number">0</span>] = <span class="hljs-string">'INDEX_END'</span>
@scanTokens (token, i) ->
<span class="hljs-keyword">if</span> token[<span class="hljs-number">0</span>] <span class="hljs-keyword">is</span> <span class="hljs-string">'INDEX_START'</span>
startToken = token
@detectEnd i + <span class="hljs-number">1</span>, condition, action
<span class="hljs-number">1</span></pre></div></div>
</li>
<li id="section-14">
<div class="annotation">
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<p>Match tags in token stream starting at <code>i</code> with <code>pattern</code>.
<code>pattern</code> may consist of strings (equality), an array of strings (one of)
or null (wildcard). Returns the index of the match or -1 if no match.</p>
</div>
<div class="content"><div class='highlight'><pre> indexOfTag: <span class="hljs-function"><span class="hljs-params">(i, pattern...)</span> -></span>
fuzz = <span class="hljs-number">0</span>
<span class="hljs-keyword">for</span> j <span class="hljs-keyword">in</span> [<span class="hljs-number">0</span> ... pattern.length]
<span class="hljs-keyword">continue</span> <span class="hljs-keyword">if</span> <span class="hljs-keyword">not</span> pattern[j]?
pattern[j] = [pattern[j]] <span class="hljs-keyword">if</span> <span class="hljs-keyword">typeof</span> pattern[j] <span class="hljs-keyword">is</span> <span class="hljs-string">'string'</span>
<span class="hljs-keyword">return</span> <span class="hljs-number">-1</span> <span class="hljs-keyword">if</span> @tag(i + j + fuzz) <span class="hljs-keyword">not</span> <span class="hljs-keyword">in</span> pattern[j]
i + j + fuzz - <span class="hljs-number">1</span></pre></div></div>
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<p>Returns <code>yes</code> if standing in front of something looking like
<code>@<x>:</code>, <code><x>:</code> or <code><EXPRESSION_START><x>...<EXPRESSION_END>:</code>.</p>
</div>
<div class="content"><div class='highlight'><pre> looksObjectish: <span class="hljs-function"><span class="hljs-params">(j)</span> -></span>
<span class="hljs-keyword">return</span> <span class="hljs-literal">yes</span> <span class="hljs-keyword">if</span> @indexOfTag(j, <span class="hljs-string">'@'</span>, <span class="hljs-literal">null</span>, <span class="hljs-string">':'</span>) <span class="hljs-keyword">isnt</span> <span class="hljs-number">-1</span> <span class="hljs-keyword">or</span> @indexOfTag(j, <span class="hljs-literal">null</span>, <span class="hljs-string">':'</span>) <span class="hljs-keyword">isnt</span> <span class="hljs-number">-1</span>
index = @indexOfTag j, EXPRESSION_START
<span class="hljs-keyword">if</span> index <span class="hljs-keyword">isnt</span> <span class="hljs-number">-1</span>
end = <span class="hljs-literal">null</span>
@detectEnd index + <span class="hljs-number">1</span>, <span class="hljs-function">(<span class="hljs-params">(token)</span> -></span> token[<span class="hljs-number">0</span>] <span class="hljs-keyword">in</span> EXPRESSION_END), <span class="hljs-function">(<span class="hljs-params">(token, i)</span> -></span> end = i)
<span class="hljs-keyword">return</span> <span class="hljs-literal">yes</span> <span class="hljs-keyword">if</span> @tag(end + <span class="hljs-number">1</span>) <span class="hljs-keyword">is</span> <span class="hljs-string">':'</span>
<span class="hljs-literal">no</span></pre></div></div>
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<p>Returns <code>yes</code> if current line of tokens contain an element of tags on same
expression level. Stop searching at <code>LINEBREAKS</code> or explicit start of
containing balanced expression.</p>
</div>
<div class="content"><div class='highlight'><pre> findTagsBackwards: <span class="hljs-function"><span class="hljs-params">(i, tags)</span> -></span>
backStack = []
<span class="hljs-keyword">while</span> i >= <span class="hljs-number">0</span> <span class="hljs-keyword">and</span> (backStack.length <span class="hljs-keyword">or</span>
@tag(i) <span class="hljs-keyword">not</span> <span class="hljs-keyword">in</span> tags <span class="hljs-keyword">and</span>
(@tag(i) <span class="hljs-keyword">not</span> <span class="hljs-keyword">in</span> EXPRESSION_START <span class="hljs-keyword">or</span> @tokens[i].generated) <span class="hljs-keyword">and</span>
@tag(i) <span class="hljs-keyword">not</span> <span class="hljs-keyword">in</span> LINEBREAKS)
backStack.push @tag(i) <span class="hljs-keyword">if</span> @tag(i) <span class="hljs-keyword">in</span> EXPRESSION_END
backStack.pop() <span class="hljs-keyword">if</span> @tag(i) <span class="hljs-keyword">in</span> EXPRESSION_START <span class="hljs-keyword">and</span> backStack.length
i -= <span class="hljs-number">1</span>
@tag(i) <span class="hljs-keyword">in</span> tags</pre></div></div>
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<p>Look for signs of implicit calls and objects in the token stream and
add them.</p>
</div>
<div class="content"><div class='highlight'><pre> addImplicitBracesAndParens: <span class="hljs-function">-></span></pre></div></div>
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<p>Track current balancing depth (both implicit and explicit) on stack.</p>
</div>
<div class="content"><div class='highlight'><pre> stack = []
start = <span class="hljs-literal">null</span>
@scanTokens (token, i, tokens) ->
[tag] = token
[prevTag] = prevToken = <span class="hljs-keyword">if</span> i > <span class="hljs-number">0</span> <span class="hljs-keyword">then</span> tokens[i - <span class="hljs-number">1</span>] <span class="hljs-keyword">else</span> []
[nextTag] = nextToken = <span class="hljs-keyword">if</span> i < tokens.length - <span class="hljs-number">1</span> <span class="hljs-keyword">then</span> tokens[i + <span class="hljs-number">1</span>] <span class="hljs-keyword">else</span> []
<span class="hljs-function"> <span class="hljs-title">stackTop</span> = -></span> stack[stack.length - <span class="hljs-number">1</span>]
startIdx = i</pre></div></div>
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<p>Helper function, used for keeping track of the number of tokens consumed
and spliced, when returning for getting a new token.</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-function"> <span class="hljs-title">forward</span> = <span class="hljs-params">(n)</span> -></span> i - startIdx + n</pre></div></div>
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<p>Helper functions</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-function"> <span class="hljs-title">isImplicit</span> = <span class="hljs-params">(stackItem)</span> -></span> stackItem?[<span class="hljs-number">2</span>]?.ours
<span class="hljs-function"> <span class="hljs-title">isImplicitObject</span> = <span class="hljs-params">(stackItem)</span> -></span> isImplicit(stackItem) <span class="hljs-keyword">and</span> stackItem?[<span class="hljs-number">0</span>] <span class="hljs-keyword">is</span> <span class="hljs-string">'{'</span>
<span class="hljs-function"> <span class="hljs-title">isImplicitCall</span> = <span class="hljs-params">(stackItem)</span> -></span> isImplicit(stackItem) <span class="hljs-keyword">and</span> stackItem?[<span class="hljs-number">0</span>] <span class="hljs-keyword">is</span> <span class="hljs-string">'('</span>
<span class="hljs-function"> <span class="hljs-title">inImplicit</span> = -></span> isImplicit stackTop()
<span class="hljs-function"> <span class="hljs-title">inImplicitCall</span> = -></span> isImplicitCall stackTop()
<span class="hljs-function"> <span class="hljs-title">inImplicitObject</span> = -></span> isImplicitObject stackTop()</pre></div></div>
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<p>Unclosed control statement inside implicit parens (like
class declaration or if-conditionals).</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-function"> <span class="hljs-title">inImplicitControl</span> = -></span> inImplicit() <span class="hljs-keyword">and</span> stackTop()?[<span class="hljs-number">0</span>] <span class="hljs-keyword">is</span> <span class="hljs-string">'CONTROL'</span>
<span class="hljs-function">
<span class="hljs-title">startImplicitCall</span> = <span class="hljs-params">(idx)</span> -></span>
stack.push [<span class="hljs-string">'('</span>, idx, ours: <span class="hljs-literal">yes</span>]
tokens.splice idx, <span class="hljs-number">0</span>, generate <span class="hljs-string">'CALL_START'</span>, <span class="hljs-string">'('</span>, [<span class="hljs-string">''</span>, <span class="hljs-string">'implicit function call'</span>, token[<span class="hljs-number">2</span>]], prevToken
<span class="hljs-function">
<span class="hljs-title">endImplicitCall</span> = -></span>
stack.pop()
tokens.splice i, <span class="hljs-number">0</span>, generate <span class="hljs-string">'CALL_END'</span>, <span class="hljs-string">')'</span>, [<span class="hljs-string">''</span>, <span class="hljs-string">'end of input'</span>, token[<span class="hljs-number">2</span>]], prevToken
i += <span class="hljs-number">1</span>
<span class="hljs-function">
<span class="hljs-title">startImplicitObject</span> = <span class="hljs-params">(idx, {startsLine = <span class="hljs-literal">yes</span>, continuationLineIndent} = {})</span> -></span>
stack.push [<span class="hljs-string">'{'</span>, idx, sameLine: <span class="hljs-literal">yes</span>, startsLine: startsLine, ours: <span class="hljs-literal">yes</span>, continuationLineIndent: continuationLineIndent]
val = <span class="hljs-keyword">new</span> <span class="hljs-built_in">String</span> <span class="hljs-string">'{'</span>
val.generated = <span class="hljs-literal">yes</span>
tokens.splice idx, <span class="hljs-number">0</span>, generate <span class="hljs-string">'{'</span>, val, token, prevToken
<span class="hljs-function">
<span class="hljs-title">endImplicitObject</span> = <span class="hljs-params">(j)</span> -></span>
j = j ? i
stack.pop()
tokens.splice j, <span class="hljs-number">0</span>, generate <span class="hljs-string">'}'</span>, <span class="hljs-string">'}'</span>, token, prevToken
i += <span class="hljs-number">1</span>
<span class="hljs-function">
<span class="hljs-title">implicitObjectContinues</span> = <span class="hljs-params">(j)</span> =></span>
nextTerminatorIdx = <span class="hljs-literal">null</span>
@detectEnd j,
<span class="hljs-function"><span class="hljs-params">(token)</span> -></span> token[<span class="hljs-number">0</span>] <span class="hljs-keyword">is</span> <span class="hljs-string">'TERMINATOR'</span>
(token, i) -> nextTerminatorIdx = i
returnOnNegativeLevel: <span class="hljs-literal">yes</span>
<span class="hljs-keyword">return</span> <span class="hljs-literal">no</span> <span class="hljs-keyword">unless</span> nextTerminatorIdx?
@looksObjectish nextTerminatorIdx + <span class="hljs-number">1</span></pre></div></div>
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<p>Don’t end an implicit call/object on next indent if any of these are in an argument/value.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">if</span> (
(inImplicitCall() <span class="hljs-keyword">or</span> inImplicitObject()) <span class="hljs-keyword">and</span> tag <span class="hljs-keyword">in</span> CONTROL_IN_IMPLICIT <span class="hljs-keyword">or</span>
inImplicitObject() <span class="hljs-keyword">and</span> prevTag <span class="hljs-keyword">is</span> <span class="hljs-string">':'</span> <span class="hljs-keyword">and</span> tag <span class="hljs-keyword">is</span> <span class="hljs-string">'FOR'</span>
)
stack.push [<span class="hljs-string">'CONTROL'</span>, i, ours: <span class="hljs-literal">yes</span>]
<span class="hljs-keyword">return</span> forward(<span class="hljs-number">1</span>)
<span class="hljs-keyword">if</span> tag <span class="hljs-keyword">is</span> <span class="hljs-string">'INDENT'</span> <span class="hljs-keyword">and</span> inImplicit()</pre></div></div>
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<p>An <code>INDENT</code> closes an implicit call unless</p>
<ol>
<li>We have seen a <code>CONTROL</code> argument on the line.</li>
<li>The last token before the indent is part of the list below.</li>
</ol>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">if</span> prevTag <span class="hljs-keyword">not</span> <span class="hljs-keyword">in</span> [<span class="hljs-string">'=>'</span>, <span class="hljs-string">'->'</span>, <span class="hljs-string">'['</span>, <span class="hljs-string">'('</span>, <span class="hljs-string">','</span>, <span class="hljs-string">'{'</span>, <span class="hljs-string">'ELSE'</span>, <span class="hljs-string">'='</span>]
<span class="hljs-keyword">while</span> inImplicitCall() <span class="hljs-keyword">or</span> inImplicitObject() <span class="hljs-keyword">and</span> prevTag <span class="hljs-keyword">isnt</span> <span class="hljs-string">':'</span>
<span class="hljs-keyword">if</span> inImplicitCall()
endImplicitCall()
<span class="hljs-keyword">else</span>
endImplicitObject()
stack.pop() <span class="hljs-keyword">if</span> inImplicitControl()
stack.push [tag, i]
<span class="hljs-keyword">return</span> forward(<span class="hljs-number">1</span>)</pre></div></div>
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<p>Straightforward start of explicit expression.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">if</span> tag <span class="hljs-keyword">in</span> EXPRESSION_START
stack.push [tag, i]
<span class="hljs-keyword">return</span> forward(<span class="hljs-number">1</span>)</pre></div></div>
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<p>Close all implicit expressions inside of explicitly closed expressions.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">if</span> tag <span class="hljs-keyword">in</span> EXPRESSION_END
<span class="hljs-keyword">while</span> inImplicit()
<span class="hljs-keyword">if</span> inImplicitCall()
endImplicitCall()
<span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> inImplicitObject()
endImplicitObject()
<span class="hljs-keyword">else</span>
stack.pop()
start = stack.pop()
<span class="hljs-function">
<span class="hljs-title">inControlFlow</span> = =></span>
seenFor = @findTagsBackwards(i, [<span class="hljs-string">'FOR'</span>]) <span class="hljs-keyword">and</span> @findTagsBackwards(i, [<span class="hljs-string">'FORIN'</span>, <span class="hljs-string">'FOROF'</span>, <span class="hljs-string">'FORFROM'</span>])
controlFlow = seenFor <span class="hljs-keyword">or</span> @findTagsBackwards i, [<span class="hljs-string">'WHILE'</span>, <span class="hljs-string">'UNTIL'</span>, <span class="hljs-string">'LOOP'</span>, <span class="hljs-string">'LEADING_WHEN'</span>]
<span class="hljs-keyword">return</span> <span class="hljs-literal">no</span> <span class="hljs-keyword">unless</span> controlFlow
isFunc = <span class="hljs-literal">no</span>
tagCurrentLine = token[<span class="hljs-number">2</span>].first_line
@detectEnd i,
<span class="hljs-function"><span class="hljs-params">(token, i)</span> -></span> token[<span class="hljs-number">0</span>] <span class="hljs-keyword">in</span> LINEBREAKS
(token, i) ->
[prevTag, ,{first_line}] = tokens[i - <span class="hljs-number">1</span>] || []
isFunc = tagCurrentLine <span class="hljs-keyword">is</span> first_line <span class="hljs-keyword">and</span> prevTag <span class="hljs-keyword">in</span> [<span class="hljs-string">'->'</span>, <span class="hljs-string">'=>'</span>]
returnOnNegativeLevel: <span class="hljs-literal">yes</span>
isFunc</pre></div></div>
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<p>Recognize standard implicit calls like
f a, f() b, f? c, h[0] d etc.
Added support for spread dots on the left side: f …a</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">if</span> (tag <span class="hljs-keyword">in</span> IMPLICIT_FUNC <span class="hljs-keyword">and</span> token.spaced <span class="hljs-keyword">or</span>
tag <span class="hljs-keyword">is</span> <span class="hljs-string">'?'</span> <span class="hljs-keyword">and</span> i > <span class="hljs-number">0</span> <span class="hljs-keyword">and</span> <span class="hljs-keyword">not</span> tokens[i - <span class="hljs-number">1</span>].spaced) <span class="hljs-keyword">and</span>
(nextTag <span class="hljs-keyword">in</span> IMPLICIT_CALL <span class="hljs-keyword">or</span>
(nextTag <span class="hljs-keyword">is</span> <span class="hljs-string">'...'</span> <span class="hljs-keyword">and</span> @tag(i + <span class="hljs-number">2</span>) <span class="hljs-keyword">in</span> IMPLICIT_CALL <span class="hljs-keyword">and</span> <span class="hljs-keyword">not</span> @findTagsBackwards(i, [<span class="hljs-string">'INDEX_START'</span>, <span class="hljs-string">'['</span>])) <span class="hljs-keyword">or</span>
nextTag <span class="hljs-keyword">in</span> IMPLICIT_UNSPACED_CALL <span class="hljs-keyword">and</span>
<span class="hljs-keyword">not</span> nextToken.spaced <span class="hljs-keyword">and</span> <span class="hljs-keyword">not</span> nextToken.newLine) <span class="hljs-keyword">and</span>
<span class="hljs-keyword">not</span> inControlFlow()
tag = token[<span class="hljs-number">0</span>] = <span class="hljs-string">'FUNC_EXIST'</span> <span class="hljs-keyword">if</span> tag <span class="hljs-keyword">is</span> <span class="hljs-string">'?'</span>
startImplicitCall i + <span class="hljs-number">1</span>
<span class="hljs-keyword">return</span> forward(<span class="hljs-number">2</span>)</pre></div></div>
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<p>Implicit call taking an implicit indented object as first argument.</p>
<pre><code>f
a: b
c: d
</code></pre><p>Don’t accept implicit calls of this type, when on the same line
as the control structures below as that may misinterpret constructs like:</p>
<pre><code><span class="hljs-keyword">if</span> f
a: <span class="hljs-number">1</span>
</code></pre><p>as</p>
<pre><code><span class="hljs-keyword">if</span> f(a: <span class="hljs-number">1</span>)
</code></pre><p>which is probably always unintended.
Furthermore don’t allow this in the first line of a literal array
or explicit object, as that creates grammatical ambiguities (#5368).</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">if</span> tag <span class="hljs-keyword">in</span> IMPLICIT_FUNC <span class="hljs-keyword">and</span>
@indexOfTag(i + <span class="hljs-number">1</span>, <span class="hljs-string">'INDENT'</span>) > <span class="hljs-number">-1</span> <span class="hljs-keyword">and</span> @looksObjectish(i + <span class="hljs-number">2</span>) <span class="hljs-keyword">and</span>
<span class="hljs-keyword">not</span> @findTagsBackwards(i, [<span class="hljs-string">'CLASS'</span>, <span class="hljs-string">'EXTENDS'</span>, <span class="hljs-string">'IF'</span>, <span class="hljs-string">'CATCH'</span>,
<span class="hljs-string">'SWITCH'</span>, <span class="hljs-string">'LEADING_WHEN'</span>, <span class="hljs-string">'FOR'</span>, <span class="hljs-string">'WHILE'</span>, <span class="hljs-string">'UNTIL'</span>]) <span class="hljs-keyword">and</span>
<span class="hljs-keyword">not</span> ((s = stackTop()?[<span class="hljs-number">0</span>]) <span class="hljs-keyword">in</span> [<span class="hljs-string">'{'</span>, <span class="hljs-string">'['</span>] <span class="hljs-keyword">and</span>
<span class="hljs-keyword">not</span> isImplicit(stackTop()) <span class="hljs-keyword">and</span>
@findTagsBackwards(i, s))
startImplicitCall i + <span class="hljs-number">1</span>
stack.push [<span class="hljs-string">'INDENT'</span>, i + <span class="hljs-number">2</span>]
<span class="hljs-keyword">return</span> forward(<span class="hljs-number">3</span>)</pre></div></div>
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<p>Implicit objects start here.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">if</span> tag <span class="hljs-keyword">is</span> <span class="hljs-string">':'</span></pre></div></div>
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<p>Go back to the (implicit) start of the object.</p>
</div>
<div class="content"><div class='highlight'><pre> s = <span class="hljs-keyword">switch</span>
<span class="hljs-keyword">when</span> @tag(i - <span class="hljs-number">1</span>) <span class="hljs-keyword">in</span> EXPRESSION_END
[startTag, startIndex] = start
<span class="hljs-keyword">if</span> startTag <span class="hljs-keyword">is</span> <span class="hljs-string">'['</span> <span class="hljs-keyword">and</span> startIndex > <span class="hljs-number">0</span> <span class="hljs-keyword">and</span> @tag(startIndex - <span class="hljs-number">1</span>) <span class="hljs-keyword">is</span> <span class="hljs-string">'@'</span> <span class="hljs-keyword">and</span> <span class="hljs-keyword">not</span> tokens[startIndex - <span class="hljs-number">1</span>].spaced
startIndex - <span class="hljs-number">1</span>
<span class="hljs-keyword">else</span>
startIndex
<span class="hljs-keyword">when</span> @tag(i - <span class="hljs-number">2</span>) <span class="hljs-keyword">is</span> <span class="hljs-string">'@'</span> <span class="hljs-keyword">then</span> i - <span class="hljs-number">2</span>
<span class="hljs-keyword">else</span> i - <span class="hljs-number">1</span>
startsLine = s <= <span class="hljs-number">0</span> <span class="hljs-keyword">or</span> @tag(s - <span class="hljs-number">1</span>) <span class="hljs-keyword">in</span> LINEBREAKS <span class="hljs-keyword">or</span> tokens[s - <span class="hljs-number">1</span>].newLine</pre></div></div>
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<p>Are we just continuing an already declared object?
Including the case where we indent on the line after an explicit ‘{‘.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">if</span> stackTop()
[stackTag, stackIdx] = stackTop()
stackNext = stack[stack.length - <span class="hljs-number">2</span>]
<span class="hljs-keyword">if</span> (stackTag <span class="hljs-keyword">is</span> <span class="hljs-string">'{'</span> <span class="hljs-keyword">or</span>
stackTag <span class="hljs-keyword">is</span> <span class="hljs-string">'INDENT'</span> <span class="hljs-keyword">and</span> stackNext?[<span class="hljs-number">0</span>] <span class="hljs-keyword">is</span> <span class="hljs-string">'{'</span> <span class="hljs-keyword">and</span>
<span class="hljs-keyword">not</span> isImplicit(stackNext) <span class="hljs-keyword">and</span>
@findTagsBackwards(stackIdx<span class="hljs-number">-1</span>, [<span class="hljs-string">'{'</span>])) <span class="hljs-keyword">and</span>
(startsLine <span class="hljs-keyword">or</span> @tag(s - <span class="hljs-number">1</span>) <span class="hljs-keyword">is</span> <span class="hljs-string">','</span> <span class="hljs-keyword">or</span> @tag(s - <span class="hljs-number">1</span>) <span class="hljs-keyword">is</span> <span class="hljs-string">'{'</span>) <span class="hljs-keyword">and</span>
@tag(s - <span class="hljs-number">1</span>) <span class="hljs-keyword">not</span> <span class="hljs-keyword">in</span> UNFINISHED
<span class="hljs-keyword">return</span> forward(<span class="hljs-number">1</span>)
preObjectToken = <span class="hljs-keyword">if</span> i > <span class="hljs-number">1</span> <span class="hljs-keyword">then</span> tokens[i - <span class="hljs-number">2</span>] <span class="hljs-keyword">else</span> []
startImplicitObject(s, {startsLine: !!startsLine, continuationLineIndent: preObjectToken.continuationLineIndent})
<span class="hljs-keyword">return</span> forward(<span class="hljs-number">2</span>)</pre></div></div>
</li>
<li id="section-31">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-31">§</a>
</div>
<p>End implicit calls when chaining method calls
like e.g.:</p>
<pre><code>f ->
a
.g b, <span class="hljs-function">-></span>
c
.h a
</code></pre><p>and also</p>
<pre><code>f a
.g b
.h a
</code></pre>
</div>
</li>
<li id="section-32">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-32">§</a>
</div>
<p>Mark all enclosing objects as not sameLine</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">if</span> tag <span class="hljs-keyword">in</span> LINEBREAKS
<span class="hljs-keyword">for</span> stackItem <span class="hljs-keyword">in</span> stack <span class="hljs-keyword">by</span> <span class="hljs-number">-1</span>
<span class="hljs-keyword">break</span> <span class="hljs-keyword">unless</span> isImplicit stackItem
stackItem[<span class="hljs-number">2</span>].sameLine = <span class="hljs-literal">no</span> <span class="hljs-keyword">if</span> isImplicitObject stackItem</pre></div></div>
</li>
<li id="section-33">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-33">§</a>
</div>
<p>End indented-continuation-line implicit objects once that indentation is over.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">if</span> tag <span class="hljs-keyword">is</span> <span class="hljs-string">'TERMINATOR'</span> <span class="hljs-keyword">and</span> token.endsContinuationLineIndentation
{preContinuationLineIndent} = token.endsContinuationLineIndentation
<span class="hljs-keyword">while</span> inImplicitObject() <span class="hljs-keyword">and</span> (implicitObjectIndent = stackTop()[<span class="hljs-number">2</span>].continuationLineIndent)? <span class="hljs-keyword">and</span> implicitObjectIndent > preContinuationLineIndent
endImplicitObject()
newLine = prevTag <span class="hljs-keyword">is</span> <span class="hljs-string">'OUTDENT'</span> <span class="hljs-keyword">or</span> prevToken.newLine
<span class="hljs-keyword">if</span> tag <span class="hljs-keyword">in</span> IMPLICIT_END <span class="hljs-keyword">or</span>
(tag <span class="hljs-keyword">in</span> CALL_CLOSERS <span class="hljs-keyword">and</span> newLine) <span class="hljs-keyword">or</span>
(tag <span class="hljs-keyword">in</span> [<span class="hljs-string">'..'</span>, <span class="hljs-string">'...'</span>] <span class="hljs-keyword">and</span> @findTagsBackwards(i, [<span class="hljs-string">"INDEX_START"</span>]))
<span class="hljs-keyword">while</span> inImplicit()
[stackTag, stackIdx, {sameLine, startsLine}] = stackTop()</pre></div></div>
</li>
<li id="section-34">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-34">§</a>
</div>
<p>Close implicit calls when reached end of argument list</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">if</span> inImplicitCall() <span class="hljs-keyword">and</span> prevTag <span class="hljs-keyword">isnt</span> <span class="hljs-string">','</span> <span class="hljs-keyword">or</span>
(prevTag <span class="hljs-keyword">is</span> <span class="hljs-string">','</span> <span class="hljs-keyword">and</span> tag <span class="hljs-keyword">is</span> <span class="hljs-string">'TERMINATOR'</span> <span class="hljs-keyword">and</span> <span class="hljs-keyword">not</span> nextTag?)
endImplicitCall()</pre></div></div>
</li>
<li id="section-35">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-35">§</a>
</div>
<p>Close implicit objects such as:
return a: 1, b: 2 unless true</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> inImplicitObject() <span class="hljs-keyword">and</span> sameLine <span class="hljs-keyword">and</span>
tag <span class="hljs-keyword">isnt</span> <span class="hljs-string">'TERMINATOR'</span> <span class="hljs-keyword">and</span> prevTag <span class="hljs-keyword">isnt</span> <span class="hljs-string">':'</span> <span class="hljs-keyword">and</span>
<span class="hljs-keyword">not</span> (tag <span class="hljs-keyword">in</span> [<span class="hljs-string">'POST_IF'</span>, <span class="hljs-string">'FOR'</span>, <span class="hljs-string">'WHILE'</span>, <span class="hljs-string">'UNTIL'</span>] <span class="hljs-keyword">and</span> startsLine <span class="hljs-keyword">and</span> implicitObjectContinues(i + <span class="hljs-number">1</span>))
endImplicitObject()</pre></div></div>
</li>
<li id="section-36">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-36">§</a>
</div>
<p>Close implicit objects when at end of line, line didn’t end with a comma
and the implicit object didn’t start the line or the next line doesn’t look like
the continuation of an object.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> inImplicitObject() <span class="hljs-keyword">and</span> tag <span class="hljs-keyword">is</span> <span class="hljs-string">'TERMINATOR'</span> <span class="hljs-keyword">and</span> prevTag <span class="hljs-keyword">isnt</span> <span class="hljs-string">','</span> <span class="hljs-keyword">and</span>
<span class="hljs-keyword">not</span> (startsLine <span class="hljs-keyword">and</span> @looksObjectish(i + <span class="hljs-number">1</span>))
endImplicitObject()
<span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> inImplicitControl() <span class="hljs-keyword">and</span> tokens[stackTop()[<span class="hljs-number">1</span>]][<span class="hljs-number">0</span>] <span class="hljs-keyword">is</span> <span class="hljs-string">'CLASS'</span> <span class="hljs-keyword">and</span> tag <span class="hljs-keyword">is</span> <span class="hljs-string">'TERMINATOR'</span>
stack.pop()
<span class="hljs-keyword">else</span>
<span class="hljs-keyword">break</span></pre></div></div>
</li>
<li id="section-37">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-37">§</a>
</div>
<p>Close implicit object if comma is the last character
and what comes after doesn’t look like it belongs.
This is used for trailing commas and calls, like:</p>
<pre><code>x =
a: b,
c: d,
e = <span class="hljs-number">2</span>
</code></pre><p>and</p>
<pre><code>f a, b: c, d: e, f, g: h: i, j
</code></pre>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">if</span> tag <span class="hljs-keyword">is</span> <span class="hljs-string">','</span> <span class="hljs-keyword">and</span> <span class="hljs-keyword">not</span> @looksObjectish(i + <span class="hljs-number">1</span>) <span class="hljs-keyword">and</span> inImplicitObject() <span class="hljs-keyword">and</span> <span class="hljs-keyword">not</span> (@tag(i + <span class="hljs-number">2</span>) <span class="hljs-keyword">in</span> [<span class="hljs-string">'FOROF'</span>, <span class="hljs-string">'FORIN'</span>]) <span class="hljs-keyword">and</span>
(nextTag <span class="hljs-keyword">isnt</span> <span class="hljs-string">'TERMINATOR'</span> <span class="hljs-keyword">or</span> <span class="hljs-keyword">not</span> @looksObjectish(i + <span class="hljs-number">2</span>))</pre></div></div>
</li>
<li id="section-38">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-38">§</a>
</div>
<p>When nextTag is OUTDENT the comma is insignificant and
should just be ignored so embed it in the implicit object.</p>
<p>When it isn’t the comma go on to play a role in a call or
array further up the stack, so give it a chance.</p>
</div>
<div class="content"><div class='highlight'><pre> offset = <span class="hljs-keyword">if</span> nextTag <span class="hljs-keyword">is</span> <span class="hljs-string">'OUTDENT'</span> <span class="hljs-keyword">then</span> <span class="hljs-number">1</span> <span class="hljs-keyword">else</span> <span class="hljs-number">0</span>
<span class="hljs-keyword">while</span> inImplicitObject()
endImplicitObject i + offset