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annotate src/luan/modules/Io.luan @ 1520:d9a5405a3102

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try statement
author Franklin Schmidt <fschmidt@gmail.com>
date Sun, 21 Jun 2020 18:14:13 -0600
parents b765f146f4dc
children 81288d8b20a2
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1 require "java"
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2 local IoLuan = require "java:luan.modules.IoLuan"
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3 local System = require "java:java.lang.System"
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4 local Boot = require "luan:Boot.luan"
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5
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6
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7 local Io = {}
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8
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9 Io.dns_lookup = IoLuan.dns_lookup
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10 Io.ip = IoLuan.ip
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11 Io.my_ips = IoLuan.my_ips
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12 Io.read_console_line = IoLuan.read_console_line
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13 Io.schemes = Boot.schemes
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14 Io.uri = Boot.uri
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15 Io.stdin = Boot.new_LuanIn( IoLuan.defaultStdin )
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16 Io.stdout = Boot.text_writer(System.out)
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17 Io.stderr = Boot.text_writer(System.err)
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18
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19 -- used by http and rpc
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20 Io.password = "password"
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21
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22 local Luan = require "luan:Luan.luan"
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23 local error = Luan.error
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24 local to_string = Luan.to_string or error()
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25 local type = Luan.type or error()
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26 local ipairs = Luan.ipairs or error()
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27 local pairs = Luan.pairs or error()
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28 local values = Luan.values or error()
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29 local load = Luan.load or error()
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30 local Table = require "luan:Table.luan"
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31 local pack = Table.pack or error()
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32 local unpack = Table.unpack or error()
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33 local String = require "luan:String.luan"
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34 local encode = String.encode or error()
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35 local matches = String.matches or error()
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36
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37
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38 -- do not change
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39 function Io.template_write(...)
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40 return Io.stdout.write(...)
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41 end
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42
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43
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44 function Io.print_to(out,...)
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45 local list = {}
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46 for _, v in values(...) do
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47 list[#list+1] = to_string(v)
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48 list[#list+1] = '\t'
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49 end
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50 if #list > 0 then
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51 list[#list] = '\n'
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52 out.write( unpack(list) )
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53 else
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54 out.write('\n')
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55 end
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56 end
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57
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58 function Io.print(...)
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59 Io.print_to(Io.stdout,...)
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60 end
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62
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63 function Io.output_to(out,fn)
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64 local old_out = Io.stdout
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65 try
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66 Io.stdout = out
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67 return fn()
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68 finally
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69 Io.stdout = old_out
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70 end
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71 end
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72
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73 local uri = Io.uri -- make local
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74
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75 function Io.output_of(fn)
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76 local string_uri = uri "string:"
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77 local out = string_uri.text_writer()
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78 Io.output_to(out,fn)
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79 out.close()
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80 return string_uri.read_text()
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81 end
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83
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84 -- debug
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85
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86 function Io.debug(prompt)
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87 prompt = prompt or "luan_debug> "
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88 local function console()
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89 return Io.read_console_line(prompt)
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90 end
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91 local env = {}
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92 for line in console do
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93 try
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94 local fn
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95 try
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96 fn = load("return "..line,"stdin",env)
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97 catch e
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98 fn = load(line,"stdin",env)
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99 end
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100 local rtn = pack( fn() )
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101 if rtn.n > 0 then
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102 Io.print( unpack(rtn) )
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103 end
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104 catch e
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105 Io.print(e)
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106 end
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107 end
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108 end
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110
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111 return Io