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<h1>repl.coffee</h1>
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<div class="content"><div class='highlight'><pre>fs = <span class="hljs-built_in">require</span> <span class="hljs-string">'fs'</span>
path = <span class="hljs-built_in">require</span> <span class="hljs-string">'path'</span>
vm = <span class="hljs-built_in">require</span> <span class="hljs-string">'vm'</span>
nodeREPL = <span class="hljs-built_in">require</span> <span class="hljs-string">'repl'</span>
CoffeeScript = <span class="hljs-built_in">require</span> <span class="hljs-string">'./coffee-script'</span>
{merge, updateSyntaxError} = <span class="hljs-built_in">require</span> <span class="hljs-string">'./helpers'</span>
replDefaults =
<span class="hljs-attribute">prompt</span>: <span class="hljs-string">'coffee> '</span>,
<span class="hljs-attribute">historyFile</span>: path.join process.env.HOME, <span class="hljs-string">'.coffee_history'</span> <span class="hljs-keyword">if</span> process.env.HOME
<span class="hljs-attribute">historyMaxInputSize</span>: <span class="hljs-number">10240</span>
<span class="hljs-attribute">eval</span>: <span class="hljs-function"><span class="hljs-params">(input, context, filename, cb)</span> -></span></pre></div></div>
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<p>XXX: multiline hack.</p>
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<div class="content"><div class='highlight'><pre> input = input.replace <span class="hljs-regexp">/\uFF00/g</span>, <span class="hljs-string">'\n'</span></pre></div></div>
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<p>Node’s REPL sends the input ending with a newline and then wrapped in
parens. Unwrap all that.</p>
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<div class="content"><div class='highlight'><pre> input = input.replace <span class="hljs-regexp">/^\(([\s\S]*)\n\)$/m</span>, <span class="hljs-string">'$1'</span></pre></div></div>
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<p>Require AST nodes to do some AST manipulation.</p>
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<div class="content"><div class='highlight'><pre> {Block, Assign, Value, Literal} = <span class="hljs-built_in">require</span> <span class="hljs-string">'./nodes'</span>
<span class="hljs-keyword">try</span></pre></div></div>
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<p>Tokenize the clean input.</p>
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<div class="content"><div class='highlight'><pre> tokens = CoffeeScript.tokens input</pre></div></div>
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<p>Collect referenced variable names just like in <code>CoffeeScript.compile</code>.</p>
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<div class="content"><div class='highlight'><pre> referencedVars = (
token[<span class="hljs-number">1</span>] <span class="hljs-keyword">for</span> token <span class="hljs-keyword">in</span> tokens <span class="hljs-keyword">when</span> token.variable
)</pre></div></div>
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<p>Generate the AST of the tokens.</p>
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<div class="content"><div class='highlight'><pre> ast = CoffeeScript.nodes tokens</pre></div></div>
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<p>Add assignment to <code>_</code> variable to force the input to be an expression.</p>
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<div class="content"><div class='highlight'><pre> ast = <span class="hljs-keyword">new</span> Block [
<span class="hljs-keyword">new</span> Assign (<span class="hljs-keyword">new</span> Value <span class="hljs-keyword">new</span> Literal <span class="hljs-string">'_'</span>), ast, <span class="hljs-string">'='</span>
]
js = ast.compile {<span class="hljs-attribute">bare</span>: <span class="hljs-literal">yes</span>, <span class="hljs-attribute">locals</span>: Object.keys(context), referencedVars}
cb <span class="hljs-literal">null</span>, runInContext js, context, filename
<span class="hljs-keyword">catch</span> err</pre></div></div>
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<p>AST’s <code>compile</code> does not add source code information to syntax errors.</p>
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<div class="content"><div class='highlight'><pre> updateSyntaxError err, input
cb err
<span class="hljs-function"><span class="hljs-title">runInContext</span> = <span class="hljs-params">(js, context, filename)</span> -></span>
<span class="hljs-keyword">if</span> context <span class="hljs-keyword">is</span> <span class="hljs-built_in">global</span>
vm.runInThisContext js, filename
<span class="hljs-keyword">else</span>
vm.runInContext js, context, filename
<span class="hljs-function"><span class="hljs-title">addMultilineHandler</span> = <span class="hljs-params">(repl)</span> -></span>
{rli, inputStream, outputStream} = repl</pre></div></div>
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<p>Node 0.11.12 changed API, prompt is now _prompt.</p>
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<div class="content"><div class='highlight'><pre> origPrompt = repl._prompt ? repl.prompt
multiline =
<span class="hljs-attribute">enabled</span>: <span class="hljs-literal">off</span>
<span class="hljs-attribute">initialPrompt</span>: origPrompt.replace <span class="hljs-regexp">/^[^> ]*/</span>, <span class="hljs-function"><span class="hljs-params">(x)</span> -></span> x.replace <span class="hljs-regexp">/./g</span>, <span class="hljs-string">'-'</span>
<span class="hljs-attribute">prompt</span>: origPrompt.replace <span class="hljs-regexp">/^[^> ]*>?/</span>, <span class="hljs-function"><span class="hljs-params">(x)</span> -></span> x.replace <span class="hljs-regexp">/./g</span>, <span class="hljs-string">'.'</span>
<span class="hljs-attribute">buffer</span>: <span class="hljs-string">''</span></pre></div></div>
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<p>Proxy node’s line listener</p>
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<div class="content"><div class='highlight'><pre> nodeLineListener = rli.listeners(<span class="hljs-string">'line'</span>)[<span class="hljs-number">0</span>]
rli.removeListener <span class="hljs-string">'line'</span>, nodeLineListener
rli.<span class="hljs-literal">on</span> <span class="hljs-string">'line'</span>, <span class="hljs-function"><span class="hljs-params">(cmd)</span> -></span>
<span class="hljs-keyword">if</span> multiline.enabled
multiline.buffer += <span class="hljs-string">"<span class="hljs-subst">#{cmd}</span>\n"</span>
rli.setPrompt multiline.prompt
rli.prompt <span class="hljs-literal">true</span>
<span class="hljs-keyword">else</span>
rli.setPrompt origPrompt
nodeLineListener cmd
<span class="hljs-keyword">return</span></pre></div></div>
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<p>Handle Ctrl-v</p>
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<div class="content"><div class='highlight'><pre> inputStream.<span class="hljs-literal">on</span> <span class="hljs-string">'keypress'</span>, <span class="hljs-function"><span class="hljs-params">(char, key)</span> -></span>
<span class="hljs-keyword">return</span> <span class="hljs-keyword">unless</span> key <span class="hljs-keyword">and</span> key.ctrl <span class="hljs-keyword">and</span> <span class="hljs-keyword">not</span> key.meta <span class="hljs-keyword">and</span> <span class="hljs-keyword">not</span> key.shift <span class="hljs-keyword">and</span> key.name <span class="hljs-keyword">is</span> <span class="hljs-string">'v'</span>
<span class="hljs-keyword">if</span> multiline.enabled</pre></div></div>
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<p>allow arbitrarily switching between modes any time before multiple lines are entered</p>
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<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">unless</span> multiline.buffer.match <span class="hljs-regexp">/\n/</span>
multiline.enabled = <span class="hljs-keyword">not</span> multiline.enabled
rli.setPrompt origPrompt
rli.prompt <span class="hljs-literal">true</span>
<span class="hljs-keyword">return</span></pre></div></div>
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<p>no-op unless the current line is empty</p>
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<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">return</span> <span class="hljs-keyword">if</span> rli.line? <span class="hljs-keyword">and</span> <span class="hljs-keyword">not</span> rli.line.match <span class="hljs-regexp">/^\s*$/</span></pre></div></div>
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<p>eval, print, loop</p>
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<div class="content"><div class='highlight'><pre> multiline.enabled = <span class="hljs-keyword">not</span> multiline.enabled
rli.line = <span class="hljs-string">''</span>
rli.cursor = <span class="hljs-number">0</span>
rli.output.cursorTo <span class="hljs-number">0</span>
rli.output.clearLine <span class="hljs-number">1</span></pre></div></div>
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<p>XXX: multiline hack</p>
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<div class="content"><div class='highlight'><pre> multiline.buffer = multiline.buffer.replace <span class="hljs-regexp">/\n/g</span>, <span class="hljs-string">'\uFF00'</span>
rli.emit <span class="hljs-string">'line'</span>, multiline.buffer
multiline.buffer = <span class="hljs-string">''</span>
<span class="hljs-keyword">else</span>
multiline.enabled = <span class="hljs-keyword">not</span> multiline.enabled
rli.setPrompt multiline.initialPrompt
rli.prompt <span class="hljs-literal">true</span>
<span class="hljs-keyword">return</span></pre></div></div>
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<p>Store and load command history from a file</p>
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<div class="content"><div class='highlight'><pre><span class="hljs-function"><span class="hljs-title">addHistory</span> = <span class="hljs-params">(repl, filename, maxSize)</span> -></span>
lastLine = <span class="hljs-literal">null</span>
<span class="hljs-keyword">try</span></pre></div></div>
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<p>Get file info and at most maxSize of command history</p>
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<div class="content"><div class='highlight'><pre> stat = fs.statSync filename
size = Math.min maxSize, stat.size</pre></div></div>
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<p>Read last <code>size</code> bytes from the file</p>
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<div class="content"><div class='highlight'><pre> readFd = fs.openSync filename, <span class="hljs-string">'r'</span>
buffer = <span class="hljs-keyword">new</span> Buffer(size)
fs.readSync readFd, buffer, <span class="hljs-number">0</span>, size, stat.size - size
fs.close readFd</pre></div></div>
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<p>Set the history on the interpreter</p>
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<div class="content"><div class='highlight'><pre> repl.rli.history = buffer.toString().split(<span class="hljs-string">'\n'</span>).reverse()</pre></div></div>
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<p>If the history file was truncated we should pop off a potential partial line</p>
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<div class="content"><div class='highlight'><pre> repl.rli.history.pop() <span class="hljs-keyword">if</span> stat.size > maxSize</pre></div></div>
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<p>Shift off the final blank newline</p>
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<div class="content"><div class='highlight'><pre> repl.rli.history.shift() <span class="hljs-keyword">if</span> repl.rli.history[<span class="hljs-number">0</span>] <span class="hljs-keyword">is</span> <span class="hljs-string">''</span>
repl.rli.historyIndex = -<span class="hljs-number">1</span>
lastLine = repl.rli.history[<span class="hljs-number">0</span>]
fd = fs.openSync filename, <span class="hljs-string">'a'</span>
repl.rli.addListener <span class="hljs-string">'line'</span>, <span class="hljs-function"><span class="hljs-params">(code)</span> -></span>
<span class="hljs-keyword">if</span> code <span class="hljs-keyword">and</span> code.length <span class="hljs-keyword">and</span> code <span class="hljs-keyword">isnt</span> <span class="hljs-string">'.history'</span> <span class="hljs-keyword">and</span> lastLine <span class="hljs-keyword">isnt</span> code</pre></div></div>
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<p>Save the latest command in the file</p>
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<div class="content"><div class='highlight'><pre> fs.write fd, <span class="hljs-string">"<span class="hljs-subst">#{code}</span>\n"</span>
lastLine = code
repl.<span class="hljs-literal">on</span> <span class="hljs-string">'exit'</span>,<span class="hljs-function"> -></span> fs.close fd</pre></div></div>
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<p>Add a command to show the history stack</p>
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<div class="content"><div class='highlight'><pre> repl.commands[getCommandId(repl, <span class="hljs-string">'history'</span>)] =
<span class="hljs-attribute">help</span>: <span class="hljs-string">'Show command history'</span>
<span class="hljs-attribute">action</span>:<span class="hljs-function"> -></span>
repl.outputStream.write <span class="hljs-string">"<span class="hljs-subst">#{repl.rli.history[..].reverse().join <span class="hljs-string">'\n'</span>}</span>\n"</span>
repl.displayPrompt()
<span class="hljs-function"><span class="hljs-title">getCommandId</span> = <span class="hljs-params">(repl, commandName)</span> -></span></pre></div></div>
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<p>Node 0.11 changed API, a command such as ‘.help’ is now stored as ‘help’</p>
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<div class="content"><div class='highlight'><pre> commandsHaveLeadingDot = repl.commands[<span class="hljs-string">'.help'</span>]?
<span class="hljs-keyword">if</span> commandsHaveLeadingDot <span class="hljs-keyword">then</span> <span class="hljs-string">".<span class="hljs-subst">#{commandName}</span>"</span> <span class="hljs-keyword">else</span> commandName
<span class="hljs-built_in">module</span>.<span class="hljs-built_in">exports</span> =
<span class="hljs-attribute">start</span>: <span class="hljs-function"><span class="hljs-params">(opts = {})</span> -></span>
[major, minor, build] = process.versions.node.split<span class="hljs-function"><span class="hljs-params">(<span class="hljs-string">'.'</span>)</span>.<span class="hljs-title">map</span> <span class="hljs-params">(n)</span> -></span> parseInt(n)
<span class="hljs-keyword">if</span> major <span class="hljs-keyword">is</span> <span class="hljs-number">0</span> <span class="hljs-keyword">and</span> minor < <span class="hljs-number">8</span>
<span class="hljs-built_in">console</span>.warn <span class="hljs-string">"Node 0.8.0+ required for CoffeeScript REPL"</span>
process.exit <span class="hljs-number">1</span>
CoffeeScript.register()
process.argv = [<span class="hljs-string">'coffee'</span>].concat process.argv[<span class="hljs-number">2.</span>.]
opts = merge replDefaults, opts
repl = nodeREPL.start opts
runInContext opts.prelude, repl.context, <span class="hljs-string">'prelude'</span> <span class="hljs-keyword">if</span> opts.prelude
repl.<span class="hljs-literal">on</span> <span class="hljs-string">'exit'</span>,<span class="hljs-function"> -></span> repl.outputStream.write <span class="hljs-string">'\n'</span> <span class="hljs-keyword">if</span> <span class="hljs-keyword">not</span> repl.rli.closed
addMultilineHandler repl
addHistory repl, opts.historyFile, opts.historyMaxInputSize <span class="hljs-keyword">if</span> opts.historyFile</pre></div></div>
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<p>Adapt help inherited from the node REPL</p>
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<div class="content"><div class='highlight'><pre> repl.commands[getCommandId(repl, <span class="hljs-string">'load'</span>)].help = <span class="hljs-string">'Load code from a file into this REPL session'</span>
repl</pre></div></div>
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