repl.coffee | |
|---|---|
vm = require 'vm'
nodeREPL = require 'repl'
CoffeeScript = require './coffee-script'
{merge} = require './helpers'
replDefaults =
prompt: 'coffee> ',
eval: (input, context, filename, cb) -> | |
| XXX: multiline hack | input = input.replace /\uFF00/g, '\n' |
| strip single-line comments | input = input.replace /(^|[\r\n]+)(\s*)##?(?:[^#\r\n][^\r\n]*|)($|[\r\n])/, '$1$2$3' |
| empty command | return cb null if /^(\s*|\(\s*\))$/.test input |
| TODO: fix #1829: pass in-scope vars and avoid accidentally shadowing them by omitting those declarations | try
js = CoffeeScript.compile "_=(#{input}\n)", {filename, bare: yes}
cb null, vm.runInContext(js, context, filename)
catch err
cb err
addMultilineHandler = (repl) ->
{rli, inputStream, outputStream} = repl
multiline =
enabled: off
initialPrompt: repl.prompt.replace(/^[^> ]*/, (x) -> x.replace /./g, '-')
prompt: repl.prompt.replace(/^[^> ]*>?/, (x) -> x.replace /./g, '.')
buffer: '' |
| Proxy node's line listener | nodeLineListener = rli.listeners('line')[0]
rli.removeListener 'line', nodeLineListener
rli.on 'line', (cmd) ->
if multiline.enabled
multiline.buffer += "#{cmd}\n"
rli.setPrompt multiline.prompt
rli.prompt true
else
nodeLineListener cmd
return |
| Handle Ctrl-v | inputStream.on 'keypress', (char, key) ->
return unless key and key.ctrl and not key.meta and not key.shift and key.name is 'v'
if multiline.enabled |
| allow arbitrarily switching between modes any time before multiple lines are entered | unless multiline.buffer.match /\n/
multiline.enabled = not multiline.enabled
rli.setPrompt repl.prompt
rli.prompt true
return |
| no-op unless the current line is empty | return if rli.line? and not rli.line.match /^\s*$/ |
| eval, print, loop | multiline.enabled = not multiline.enabled
rli.line = ''
rli.cursor = 0
rli.output.cursorTo 0
rli.output.clearLine 1 |
| XXX: multiline hack | multiline.buffer = multiline.buffer.replace /\n/g, '\uFF00'
rli.emit 'line', multiline.buffer
multiline.buffer = ''
else
multiline.enabled = not multiline.enabled
rli.setPrompt multiline.initialPrompt
rli.prompt true
return
module.exports =
start: (opts = {}) ->
opts = merge replDefaults, opts
repl = nodeREPL.start opts
repl.on 'exit', -> repl.outputStream.write '\n'
addMultilineHandler repl
repl
|