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annotate core/src/luan/modules/Io.luan @ 693:ca169567ce07

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module URIs must now include ".luan"
author Franklin Schmidt <fschmidt@gmail.com>
date Tue, 19 Apr 2016 15:54:11 -0600
parents ecd436959855
children b620b8e1010f
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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.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.luan"
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26 local unpack = Table.unpack or error()
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27 local String = require "luan:String.luan"
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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 -- do not change
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33 function M.template_write(...)
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34 return M.stdout.write(...)
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35 end
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36
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37
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38 function M.print_to(out,...)
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39 local list = {}
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40 for v in values(...) do
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41 list[#list+1] = to_string(v)
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42 list[#list+1] = '\t'
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43 end
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44 if #list > 0 then
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45 list[#list] = '\n'
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46 out.write( unpack(list) )
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47 end
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48 end
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49
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50 function M.print(...)
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51 M.print_to(M.stdout,...)
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52 end
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53
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54
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55 function M.output_to(out,fn,...)
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56 local old_out = M.stdout
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57 return try( {
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58 function(...)
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59 M.stdout = out
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60 fn(...)
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61 end;
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62 finally = function()
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63 M.stdout = old_out
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64 end;
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65 }, ... )
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66 end
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67
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68 local uri = M.uri -- make local
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69
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70 function M.output_of(fn,...)
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71 local string_uri = uri "string:"
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72 local out = string_uri.text_writer()
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73 M.output_to(out,fn,...)
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74 out.close()
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75 return string_uri.read_text()
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76 end
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77
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78
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79 -- repr
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80
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81 local function do_repr(out,obj,strict,done)
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82 local tp = type(obj)
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83 if tp == "table" then
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84 if done[obj] == true then
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85 strict and error "circular reference"
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86 out.write "<circular reference>"
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87 return
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88 end
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89 done[obj] = true
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90 out.write( "{" )
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91 local is_first = true
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92 local in_list = {}
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93 for key, value in ipairs(obj) do
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94 if is_first then is_first = false else out.write ", " end
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95 do_repr(out,value,strict,done)
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96 in_list[key] = true
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97 end
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98 for key, value in pairs(obj) do
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99 if in_list[key] ~= true then
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100 if is_first then is_first = false else out.write ", " end
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101 if type(key) == "string" and matches(key,"^[a-zA-Z_][a-zA-Z_0-9]*$") ~= nil then
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102 out.write( key )
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103 elseif type(key) == "table" then
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104 out.write( "[<", key, ">]" )
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105 else
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106 out.write "["
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107 do_repr(out,key,strict,done)
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108 out.write "]"
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109 end
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110 out.write "="
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111 do_repr(out,value,strict,done)
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112 end
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113 end
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114 out.write "}"
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115 elseif tp == "string" then
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116 out.write( '"', encode(obj), '"' )
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117 elseif tp == "nil" or tp == "boolean" or tp == "number" then
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118 out.write( obj )
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119 else
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120 strict and error("can't repr type '"..tp.."' of "..obj)
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121 out.write( "<", obj, ">" )
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122 end
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123 end
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124
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125 function M.repr(obj,strict)
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126 local string_uri = uri "string:"
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127 local out = string_uri.text_writer()
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128 do_repr(out,obj,strict or false,{})
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129 out.close()
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130 return string_uri.read_text()
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131 end
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132
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133
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134 -- useful for SimplyHTML responsiveness
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135
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136 local NO = {}
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137 M.NO = NO
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138
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139 function M.dont_write_when_no(write_fn)
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140 return function(...)
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141 for v in values(...) do
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142 if v == NO then
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143 return
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144 end
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145 end
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146 write_fn(...)
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147 end
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148 end
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149
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150
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151 -- debug
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152
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153 function M.debug(prompt)
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154 prompt = prompt or "luan_debug> "
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155 local function console()
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156 return M.read_console_line(prompt)
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157 end
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158 local env = {}
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159 for line in console do
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160 try {
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161 function()
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162 local fn = load(line,"stdin",env,true)
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163 M.print( fn() )
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164 end;
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165 catch = function(e)
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166 M.print(e)
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167 end;
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168 }
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169 end
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170 end
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171
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172
503
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173 return M