625 lines
25 KiB
HTML
625 lines
25 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<title>repl.coffee</title>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<meta name="viewport" content="width=device-width, target-densitydpi=160dpi, initial-scale=1.0; maximum-scale=1.0; user-scalable=0;">
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<link rel="stylesheet" media="all" href="docco.css" />
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</head>
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<body>
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<div id="container">
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<div id="background"></div>
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<ul id="jump_to">
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<li>
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<a class="large" href="javascript:void(0);">Jump To …</a>
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<a class="small" href="javascript:void(0);">+</a>
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<div id="jump_page">
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<a class="source" href="browser.html">
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browser.coffee
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</a>
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<a class="source" href="cake.html">
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cake.coffee
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</a>
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<a class="source" href="coffee-script.html">
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coffee-script.coffee
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</a>
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<a class="source" href="command.html">
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command.coffee
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</a>
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<a class="source" href="grammar.html">
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grammar.coffee
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</a>
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<a class="source" href="helpers.html">
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helpers.coffee
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</a>
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<a class="source" href="index.html">
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index.coffee
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</a>
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lexer.coffee
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</a>
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<a class="source" href="nodes.html">
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nodes.coffee
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</a>
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<a class="source" href="optparse.html">
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optparse.coffee
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</a>
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<a class="source" href="register.html">
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register.coffee
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</a>
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<a class="source" href="repl.html">
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repl.coffee
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</a>
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<a class="source" href="rewriter.html">
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rewriter.coffee
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</a>
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<a class="source" href="scope.html">
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scope.litcoffee
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</a>
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<a class="source" href="sourcemap.html">
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sourcemap.litcoffee
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</a>
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</div>
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</div>
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</li>
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</ul>
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<ul class="sections">
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<li id="title">
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<div class="annotation">
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<h1>repl.coffee</h1>
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</div>
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</li>
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<li id="section-1">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-1">¶</a>
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</div>
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</div>
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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>
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path = <span class="hljs-built_in">require</span> <span class="hljs-string">'path'</span>
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vm = <span class="hljs-built_in">require</span> <span class="hljs-string">'vm'</span>
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nodeREPL = <span class="hljs-built_in">require</span> <span class="hljs-string">'repl'</span>
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CoffeeScript = <span class="hljs-built_in">require</span> <span class="hljs-string">'./coffee-script'</span>
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{merge, updateSyntaxError} = <span class="hljs-built_in">require</span> <span class="hljs-string">'./helpers'</span>
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replDefaults =
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prompt: <span class="hljs-string">'coffee> '</span>,
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historyFile: path.join process.env.HOME, <span class="hljs-string">'.coffee_history'</span> <span class="hljs-keyword">if</span> process.env.HOME
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historyMaxInputSize: <span class="hljs-number">10240</span>
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eval: <span class="hljs-function"><span class="hljs-params">(input, context, filename, cb)</span> -></span></pre></div></div>
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</li>
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<li id="section-2">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-2">¶</a>
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</div>
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<p>XXX: multiline hack.</p>
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</div>
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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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</li>
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<li id="section-3">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-3">¶</a>
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</div>
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<p>Node’s REPL sends the input ending with a newline and then wrapped in
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parens. Unwrap all that.</p>
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</div>
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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">'$1'</span></pre></div></div>
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</li>
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<li id="section-4">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-4">¶</a>
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</div>
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<p>Node’s REPL v6.9.1+ sends the input wrapped in a try/catch statement.
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Unwrap that too.</p>
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</div>
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<div class="content"><div class='highlight'><pre> input = input.replace <span class="hljs-regexp">/^\s*try\s*{([\s\S]*)}\s*catch.*$/m</span>, <span class="hljs-string">'$1'</span></pre></div></div>
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</li>
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<li id="section-5">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-5">¶</a>
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</div>
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<p>Require AST nodes to do some AST manipulation.</p>
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</div>
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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>
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<span class="hljs-keyword">try</span></pre></div></div>
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</li>
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<li id="section-6">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-6">¶</a>
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</div>
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<p>Tokenize the clean input.</p>
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</div>
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<div class="content"><div class='highlight'><pre> tokens = CoffeeScript.tokens input</pre></div></div>
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</li>
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<li id="section-7">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-7">¶</a>
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</div>
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<p>Collect referenced variable names just like in <code>CoffeeScript.compile</code>.</p>
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</div>
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<div class="content"><div class='highlight'><pre> referencedVars = (
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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[<span class="hljs-number">0</span>] <span class="hljs-keyword">is</span> <span class="hljs-string">'IDENTIFIER'</span>
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)</pre></div></div>
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</li>
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<li id="section-8">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-8">¶</a>
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</div>
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<p>Generate the AST of the tokens.</p>
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</div>
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<div class="content"><div class='highlight'><pre> ast = CoffeeScript.nodes tokens</pre></div></div>
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</li>
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<li id="section-9">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-9">¶</a>
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</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>
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<div class="content"><div class='highlight'><pre> ast = <span class="hljs-keyword">new</span> Block [
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<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>
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]
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js = ast.compile {bare: <span class="hljs-literal">yes</span>, locals: Object.keys(context), referencedVars}
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cb <span class="hljs-literal">null</span>, runInContext js, context, filename
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<span class="hljs-keyword">catch</span> err</pre></div></div>
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</li>
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<li id="section-10">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-10">¶</a>
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</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>
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<div class="content"><div class='highlight'><pre> updateSyntaxError err, input
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cb err
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<span class="hljs-function">
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<span class="hljs-title">runInContext</span> = <span class="hljs-params">(js, context, filename)</span> -></span>
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<span class="hljs-keyword">if</span> context <span class="hljs-keyword">is</span> <span class="hljs-built_in">global</span>
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vm.runInThisContext js, filename
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<span class="hljs-keyword">else</span>
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vm.runInContext js, context, filename
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<span class="hljs-function">
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<span class="hljs-title">addMultilineHandler</span> = <span class="hljs-params">(repl)</span> -></span>
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{rli, inputStream, outputStream} = repl</pre></div></div>
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</li>
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<li id="section-11">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-11">¶</a>
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</div>
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<p>Node 0.11.12 changed API, prompt is now _prompt.</p>
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</div>
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<div class="content"><div class='highlight'><pre> origPrompt = repl._prompt ? repl.prompt
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multiline =
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enabled: <span class="hljs-literal">off</span>
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initialPrompt: 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>
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prompt: 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>
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buffer: <span class="hljs-string">''</span></pre></div></div>
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</li>
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<li id="section-12">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-12">¶</a>
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</div>
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<p>Proxy node’s line listener</p>
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</div>
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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>]
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rli.removeListener <span class="hljs-string">'line'</span>, nodeLineListener
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rli.<span class="hljs-literal">on</span> <span class="hljs-string">'line'</span>, <span class="hljs-function"><span class="hljs-params">(cmd)</span> -></span>
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<span class="hljs-keyword">if</span> multiline.enabled
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multiline.buffer += <span class="hljs-string">"<span class="hljs-subst">#{cmd}</span>\n"</span>
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rli.setPrompt multiline.prompt
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rli.prompt <span class="hljs-literal">true</span>
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<span class="hljs-keyword">else</span>
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rli.setPrompt origPrompt
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nodeLineListener cmd
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<span class="hljs-keyword">return</span></pre></div></div>
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</li>
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<li id="section-13">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-13">¶</a>
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</div>
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<p>Handle Ctrl-v</p>
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</div>
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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>
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<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>
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<span class="hljs-keyword">if</span> multiline.enabled</pre></div></div>
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</li>
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<li id="section-14">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-14">¶</a>
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</div>
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<p>allow arbitrarily switching between modes any time before multiple lines are entered</p>
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</div>
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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>
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multiline.enabled = <span class="hljs-keyword">not</span> multiline.enabled
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rli.setPrompt origPrompt
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rli.prompt <span class="hljs-literal">true</span>
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<span class="hljs-keyword">return</span></pre></div></div>
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</li>
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<li id="section-15">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-15">¶</a>
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</div>
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<p>no-op unless the current line is empty</p>
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</div>
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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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</li>
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<li id="section-16">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-16">¶</a>
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</div>
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<p>eval, print, loop</p>
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</div>
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<div class="content"><div class='highlight'><pre> multiline.enabled = <span class="hljs-keyword">not</span> multiline.enabled
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rli.line = <span class="hljs-string">''</span>
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rli.cursor = <span class="hljs-number">0</span>
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rli.output.cursorTo <span class="hljs-number">0</span>
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rli.output.clearLine <span class="hljs-number">1</span></pre></div></div>
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</li>
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<li id="section-17">
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<div class="annotation">
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||
<div class="pilwrap ">
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<a class="pilcrow" href="#section-17">¶</a>
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</div>
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<p>XXX: multiline hack</p>
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</div>
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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>
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rli.emit <span class="hljs-string">'line'</span>, multiline.buffer
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multiline.buffer = <span class="hljs-string">''</span>
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<span class="hljs-keyword">else</span>
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multiline.enabled = <span class="hljs-keyword">not</span> multiline.enabled
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rli.setPrompt multiline.initialPrompt
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rli.prompt <span class="hljs-literal">true</span>
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<span class="hljs-keyword">return</span></pre></div></div>
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</li>
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<li id="section-18">
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<div class="annotation">
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||
<div class="pilwrap ">
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<a class="pilcrow" href="#section-18">¶</a>
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</div>
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<p>Store and load command history from a file</p>
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</div>
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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>
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lastLine = <span class="hljs-literal">null</span>
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<span class="hljs-keyword">try</span></pre></div></div>
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</li>
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<li id="section-19">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-19">¶</a>
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</div>
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<p>Get file info and at most maxSize of command history</p>
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</div>
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<div class="content"><div class='highlight'><pre> stat = fs.statSync filename
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size = Math.min maxSize, stat.size</pre></div></div>
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</li>
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<li id="section-20">
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<div class="annotation">
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<div class="pilwrap ">
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<a class="pilcrow" href="#section-20">¶</a>
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</div>
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<p>Read last <code>size</code> bytes from the file</p>
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</div>
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<div class="content"><div class='highlight'><pre> readFd = fs.openSync filename, <span class="hljs-string">'r'</span>
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buffer = <span class="hljs-keyword">new</span> Buffer(size)
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fs.readSync readFd, buffer, <span class="hljs-number">0</span>, size, stat.size - size
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fs.closeSync readFd</pre></div></div>
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</li>
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<li id="section-21">
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<div class="annotation">
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||
<div class="pilwrap ">
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<a class="pilcrow" href="#section-21">¶</a>
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</div>
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<p>Set the history on the interpreter</p>
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</div>
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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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</li>
|
||
|
||
|
||
<li id="section-22">
|
||
<div class="annotation">
|
||
|
||
<div class="pilwrap ">
|
||
<a class="pilcrow" href="#section-22">¶</a>
|
||
</div>
|
||
<p>If the history file was truncated we should pop off a potential partial line</p>
|
||
|
||
</div>
|
||
|
||
<div class="content"><div class='highlight'><pre> repl.rli.history.pop() <span class="hljs-keyword">if</span> stat.size > maxSize</pre></div></div>
|
||
|
||
</li>
|
||
|
||
|
||
<li id="section-23">
|
||
<div class="annotation">
|
||
|
||
<div class="pilwrap ">
|
||
<a class="pilcrow" href="#section-23">¶</a>
|
||
</div>
|
||
<p>Shift off the final blank newline</p>
|
||
|
||
</div>
|
||
|
||
<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> code <span class="hljs-keyword">isnt</span> <span class="hljs-string">'.exit'</span> <span class="hljs-keyword">and</span> lastLine <span class="hljs-keyword">isnt</span> code</pre></div></div>
|
||
|
||
</li>
|
||
|
||
|
||
<li id="section-24">
|
||
<div class="annotation">
|
||
|
||
<div class="pilwrap ">
|
||
<a class="pilcrow" href="#section-24">¶</a>
|
||
</div>
|
||
<p>Save the latest command in the file</p>
|
||
|
||
</div>
|
||
|
||
<div class="content"><div class='highlight'><pre> fs.writeSync 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.closeSync fd</pre></div></div>
|
||
|
||
</li>
|
||
|
||
|
||
<li id="section-25">
|
||
<div class="annotation">
|
||
|
||
<div class="pilwrap ">
|
||
<a class="pilcrow" href="#section-25">¶</a>
|
||
</div>
|
||
<p>Add a command to show the history stack</p>
|
||
|
||
</div>
|
||
|
||
<div class="content"><div class='highlight'><pre> repl.commands[getCommandId(repl, <span class="hljs-string">'history'</span>)] =
|
||
help: <span class="hljs-string">'Show command history'</span>
|
||
action: <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>
|
||
|
||
</li>
|
||
|
||
|
||
<li id="section-26">
|
||
<div class="annotation">
|
||
|
||
<div class="pilwrap ">
|
||
<a class="pilcrow" href="#section-26">¶</a>
|
||
</div>
|
||
<p>Node 0.11 changed API, a command such as ‘.help’ is now stored as ‘help’</p>
|
||
|
||
</div>
|
||
|
||
<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>.exports =
|
||
start: <span class="hljs-function"><span class="hljs-params">(opts = {})</span> -></span>
|
||
[major, minor, build] = process.versions.node.split(<span class="hljs-string">'.'</span>).map (n) -> parseInt(n, <span class="hljs-number">10</span>)
|
||
|
||
<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>
|
||
|
||
</li>
|
||
|
||
|
||
<li id="section-27">
|
||
<div class="annotation">
|
||
|
||
<div class="pilwrap ">
|
||
<a class="pilcrow" href="#section-27">¶</a>
|
||
</div>
|
||
<p>Adapt help inherited from the node REPL</p>
|
||
|
||
</div>
|
||
|
||
<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>
|
||
|
||
</li>
|
||
|
||
</ul>
|
||
</div>
|
||
</body>
|
||
</html>
|