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annotate core/src/luan/modules/Io.luan @ 589:97c8ae330efe

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add varargs to Luan.try; add Io.output_to and Io.output_of;
author Franklin Schmidt <fschmidt@gmail.com>
date Wed, 26 Aug 2015 04:38:37 -0600
parents 18504c41b0be
children 790d5de23042
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1 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
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5 local M = {}
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6
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7 M.read_console_line = IoLuan.read_console_line
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8 M.schemes = IoLuan.newSchemes()
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9 M.uri = IoLuan.uri
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10 M.stdin = IoLuan.defaultStdin.table()
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11 M.socket_server = IoLuan.socket_server
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12 M.stdout = IoLuan.textWriter(System.out)
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13 M.stderr = IoLuan.textWriter(System.err)
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15
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16 local Luan = require "luan:Luan"
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17 local error = Luan.error
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18 local to_string = Luan.to_string or error()
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19 local type = Luan.type or error()
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20 local try = Luan.try or error()
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21 local ipairs = Luan.ipairs or error()
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22 local pairs = Luan.pairs or error()
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23 local values = Luan.values or error()
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24 local load = Luan.load or error()
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25 local Table = require "luan:Table"
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26 local unpack = Table.unpack or error()
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27 local String = require "luan:String"
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28 local encode = String.encode or error()
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29 local matches = String.matches or error()
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31
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32 function M.print_to(out,...)
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33 local list = {}
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34 for v in values(...) do
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35 list[#list+1] = to_string(v)
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36 list[#list+1] = '\t'
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37 end
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38 if #list > 0 then
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39 list[#list] = '\n'
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40 out.write( unpack(list) )
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41 end
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42 end
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43
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44 function M.print(...)
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45 M.print_to(M.stdout,...)
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46 end
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47
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48
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49 function M.output_to(out,fn,...)
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50 local old_out = M.stdout
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51 return try( {
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52 function(...)
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53 M.stdout = out
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54 fn(...)
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55 end;
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56 finally = function()
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57 M.stdout = old_out
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58 end;
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59 }, ... )
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60 end
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61
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62 local uri = M.uri -- make local
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63
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64 function M.output_of(fn,...)
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65 local string_uri = uri "string:"
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66 local out = string_uri.text_writer()
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67 M.output_to(out,fn,...)
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68 out.close()
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69 return string_uri.read_text()
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70 end
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71
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72
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73 -- repr
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74
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75 local function do_repr(obj,done)
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76 local tp = type(obj)
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77 if tp == "table" then
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78 if done[obj] == true then
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79 %><circular reference><%
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80 return
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81 end
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82 done[obj] = true
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83 %>{<%
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84 local is_first = true
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85 local in_list = {}
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86 for key, value in ipairs(obj) do
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87 if is_first then is_first = false else %>, <% end
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88 do_repr(value,done)
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89 in_list[key] = true
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90 end
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91 for key, value in pairs(obj) do
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92 if in_list[key] ~= true then
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93 if is_first then is_first = false else %>, <% end
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94 if type(key) == "string" and matches(key,"[a-zA-Z_][a-zA-Z_0-9]*") ~= nil then
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95 %><%=key%><%
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96 elseif type(key) == "table" then
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97 %>[<<%=key%>>]<%
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98 else
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99 %>[<%do_repr(key,done)%>]<%
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100 end
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101 %>=<% do_repr(value,done)
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102 end
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103 end
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104 %>}<%
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105 elseif tp == "string" then
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106 %>"<%=encode(obj)%>"<%
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107 elseif tp == "nil" or tp == "boolean" or tp == "number" then
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108 %><%=obj%><%
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109 else
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110 %><<%=obj%>><%
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111 end
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112 end
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113
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114 function M.repr(obj)
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115 return M.output_of(do_repr,obj,{})
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116 end
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117
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118
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119 -- useful for SimplyHTML responsiveness
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120
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121 local NO = {}
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122 M.NO = NO
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123
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124 function M.dont_write_when_no(write_fn)
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125 return function(...)
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126 for v in values(...) do
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127 if v == NO then
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128 return
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129 end
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130 end
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131 write_fn(...)
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132 end
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133 end
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134
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135
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136 -- debug
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137
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138 function M.debug(prompt)
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139 prompt = prompt or "luan_debug> "
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140 local function console()
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141 return M.read_console_line(prompt)
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142 end
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143 local env = {}
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144 for line in console do
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145 try {
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146 function()
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147 local fn = load(line,"stdin",env,true)
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148 M.print( fn() )
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149 end;
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150 catch = function(e)
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151 M.print(e)
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152 end;
18504c41b0be move debug() to Io and remove Debug module;
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153 }
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154 end
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155 end
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156
18504c41b0be move debug() to Io and remove Debug module;
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157
503
92c3d22745b8 make _ENV optional
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158 return M