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annotate share/lua/5.2/luarocks/util.lua @ 11624:712b78c987cf draft
<wob_jonas> fetch share/mtg/allsets-2018-05-21.zip https://yawgatog.com/resources/oracle/All%20Sets-2018-05-21.zip
author | HackEso <hackeso@esolangs.org> |
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date | Fri, 05 Oct 2018 15:41:48 +0000 |
parents | d137f631bad5 |
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1 |
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2 --- Assorted utilities for managing tables, plus a scheduler for rollback functions. |
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3 -- Does not requires modules directly (only as locals |
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4 -- inside specific functions) to avoid interdependencies, |
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5 -- as this is used in the bootstrapping stage of luarocks.cfg. |
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6 |
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7 local global_env = _G |
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8 |
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9 module("luarocks.util", package.seeall) |
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10 |
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11 local scheduled_functions = {} |
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12 |
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13 --- Schedule a function to be executed upon program termination. |
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14 -- This is useful for actions such as deleting temporary directories |
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15 -- or failure rollbacks. |
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16 -- @param f function: Function to be executed. |
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17 -- @param ... arguments to be passed to function. |
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18 -- @return table: A token representing the scheduled execution, |
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19 -- which can be used to remove the item later from the list. |
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20 function schedule_function(f, ...) |
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21 assert(type(f) == "function") |
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22 |
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23 local item = { fn = f, args = {...} } |
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24 table.insert(scheduled_functions, item) |
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25 return item |
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26 end |
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27 |
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28 --- Unschedule a function. |
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29 -- This is useful for cancelling a rollback of a completed operation. |
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30 -- @param item table: The token representing the scheduled function that was |
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31 -- returned from the schedule_function call. |
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32 function remove_scheduled_function(item) |
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33 for k, v in pairs(scheduled_functions) do |
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34 if v == item then |
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35 table.remove(scheduled_functions, k) |
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36 return |
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37 end |
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38 end |
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39 end |
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40 |
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41 --- Execute scheduled functions. |
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42 -- Some calls create temporary files and/or directories and register |
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43 -- corresponding cleanup functions. Calling this function will run |
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44 -- these function, erasing temporaries. |
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45 -- Functions are executed in the inverse order they were scheduled. |
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46 function run_scheduled_functions() |
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47 local fs = require("luarocks.fs") |
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48 fs.change_dir_to_root() |
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49 for i = #scheduled_functions, 1, -1 do |
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50 local item = scheduled_functions[i] |
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51 item.fn(unpack(item.args)) |
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52 end |
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53 end |
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54 |
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55 --- Extract flags from an arguments list. |
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56 -- Given string arguments, extract flag arguments into a flags set. |
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57 -- For example, given "foo", "--tux=beep", "--bla", "bar", "--baz", |
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58 -- it would return the following: |
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59 -- {["bla"] = true, ["tux"] = "beep", ["baz"] = true}, "foo", "bar". |
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60 function parse_flags(...) |
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61 local args = {...} |
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62 local flags = {} |
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63 for i = #args, 1, -1 do |
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64 local flag = args[i]:match("^%-%-(.*)") |
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65 if flag then |
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66 local var,val = flag:match("([a-z_%-]*)=(.*)") |
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67 if val then |
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68 flags[var] = val |
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69 else |
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70 flags[flag] = true |
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71 end |
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72 table.remove(args, i) |
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73 end |
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74 end |
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75 return flags, unpack(args) |
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76 end |
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77 |
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78 --- Merges contents of src on top of dst's contents. |
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79 -- @param dst Destination table, which will receive src's contents. |
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80 -- @param src Table which provides new contents to dst. |
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81 -- @see platform_overrides |
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82 function deep_merge(dst, src) |
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83 for k, v in pairs(src) do |
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84 if type(v) == "table" then |
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85 if not dst[k] then |
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86 dst[k] = {} |
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87 end |
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88 if type(dst[k]) == "table" then |
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89 deep_merge(dst[k], v) |
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90 else |
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91 dst[k] = v |
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92 end |
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93 else |
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94 dst[k] = v |
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95 end |
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96 end |
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97 end |
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98 |
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99 --- Perform platform-specific overrides on a table. |
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100 -- Overrides values of table with the contents of the appropriate |
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101 -- subset of its "platforms" field. The "platforms" field should |
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102 -- be a table containing subtables keyed with strings representing |
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103 -- platform names. Names that match the contents of the global |
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104 -- cfg.platforms setting are used. For example, if |
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105 -- cfg.platforms= {"foo"}, then the fields of |
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106 -- tbl.platforms.foo will overwrite those of tbl with the same |
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107 -- names. For table values, the operation is performed recursively |
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108 -- (tbl.platforms.foo.x.y.z overrides tbl.x.y.z; other contents of |
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109 -- tbl.x are preserved). |
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110 -- @param tbl table or nil: Table which may contain a "platforms" field; |
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111 -- if it doesn't (or if nil is passed), this function does nothing. |
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112 function platform_overrides(tbl) |
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113 assert(type(tbl) == "table" or not tbl) |
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114 |
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115 local cfg = require("luarocks.cfg") |
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116 |
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117 if not tbl then return end |
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118 |
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119 if tbl.platforms then |
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120 for _, platform in ipairs(cfg.platforms) do |
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121 local platform_tbl = tbl.platforms[platform] |
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122 if platform_tbl then |
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123 deep_merge(tbl, platform_tbl) |
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124 end |
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125 end |
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126 end |
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127 tbl.platforms = nil |
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128 end |
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129 |
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130 local var_format_pattern = "%$%((%a[%a%d_]+)%)" |
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131 |
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132 --- Create a new shallow copy of a table: a new table with |
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133 -- the same keys and values. Keys point to the same objects as |
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134 -- the original table (ie, does not copy recursively). |
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135 -- @param tbl table: the input table |
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136 -- @return table: a new table with the same contents. |
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137 local function make_shallow_copy(tbl) |
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138 local copy = {} |
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139 for k,v in pairs(tbl) do |
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140 copy[k] = v |
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141 end |
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142 return copy |
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143 end |
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144 |
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145 -- Check if a set of needed variables are referenced |
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146 -- somewhere in a list of definitions, warning the user |
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147 -- about any unused ones. Each key in needed_set should |
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148 -- appear as a $(XYZ) variable at least once as a |
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149 -- substring of some value of var_defs. |
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150 -- @param var_defs: a table with string keys and string |
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151 -- values, containing variable definitions. |
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152 -- @param needed_set: a set where keys are the names of |
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153 -- needed variables. |
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154 -- @param msg string: the warning message to display. |
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155 function warn_if_not_used(var_defs, needed_set, msg) |
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156 needed_set = make_shallow_copy(needed_set) |
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157 for var,val in pairs(var_defs) do |
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158 for used in val:gmatch(var_format_pattern) do |
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159 needed_set[used] = nil |
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160 end |
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161 end |
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162 for var,_ in pairs(needed_set) do |
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163 warning(msg:format(var)) |
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164 end |
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165 end |
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166 |
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167 -- Output any entries that might remain in $(XYZ) format, |
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168 -- warning the user that substitutions have failed. |
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169 -- @param line string: the input string |
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170 local function warn_failed_matches(line) |
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171 local any_failed = false |
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172 if line:match(var_format_pattern) then |
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173 for unmatched in line:gmatch(var_format_pattern) do |
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174 warning("unmatched variable " .. unmatched) |
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175 any_failed = true |
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176 end |
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177 end |
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178 return any_failed |
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179 end |
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180 |
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181 --- Perform make-style variable substitutions on string values of a table. |
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182 -- For every string value tbl.x which contains a substring of the format |
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183 -- "$(XYZ)" will have this substring replaced by vars["XYZ"], if that field |
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184 -- exists in vars. Only string values are processed; this function |
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185 -- does not scan subtables recursively. |
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186 -- @param tbl table: Table to have its string values modified. |
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187 -- @param vars table: Table containing string-string key-value pairs |
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188 -- representing variables to replace in the strings values of tbl. |
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189 function variable_substitutions(tbl, vars) |
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190 assert(type(tbl) == "table") |
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191 assert(type(vars) == "table") |
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192 |
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193 local updated = {} |
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194 for k, v in pairs(tbl) do |
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195 if type(v) == "string" then |
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196 updated[k] = v:gsub(var_format_pattern, vars) |
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197 if warn_failed_matches(updated[k]) then |
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198 updated[k] = updated[k]:gsub(var_format_pattern, "") |
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199 end |
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200 end |
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201 end |
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202 for k, v in pairs(updated) do |
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203 tbl[k] = v |
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204 end |
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205 end |
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206 |
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207 --- Return an array of keys of a table. |
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208 -- @param tbl table: The input table. |
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209 -- @return table: The array of keys. |
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210 function keys(tbl) |
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211 local ks = {} |
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212 for k,_ in pairs(tbl) do |
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213 table.insert(ks, k) |
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214 end |
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215 return ks |
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216 end |
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217 |
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218 local function default_sort(a, b) |
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219 local ta = type(a) |
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220 local tb = type(b) |
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221 if ta == "number" and tb == "number" then |
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222 return a < b |
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223 elseif ta == "number" then |
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224 return true |
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225 elseif tb == "number" then |
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226 return false |
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227 else |
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228 return tostring(a) < tostring(b) |
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229 end |
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230 end |
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231 |
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232 -- The iterator function used internally by util.sortedpairs. |
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233 -- @param tbl table: The table to be iterated. |
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234 -- @param sort_function function or nil: An optional comparison function |
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235 -- to be used by table.sort when sorting keys. |
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236 -- @see sortedpairs |
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237 local function sortedpairs_iterator(tbl, sort_function) |
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238 local ks = keys(tbl) |
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239 if not sort_function or type(sort_function) == "function" then |
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240 table.sort(ks, sort_function or default_sort) |
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241 for _, k in ipairs(ks) do |
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242 coroutine.yield(k, tbl[k]) |
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243 end |
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244 else |
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245 local order = sort_function |
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246 local done = {} |
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247 for _, k in ipairs(order) do |
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248 local sub_order |
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249 if type(k) == "table" then |
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250 sub_order = k[2] |
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251 k = k[1] |
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252 end |
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253 if tbl[k] then |
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254 done[k] = true |
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255 coroutine.yield(k, tbl[k], sub_order) |
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256 end |
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257 end |
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258 table.sort(ks, default_sort) |
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259 for _, k in ipairs(ks) do |
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260 if not done[k] then |
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261 coroutine.yield(k, tbl[k]) |
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262 end |
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263 end |
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264 end |
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265 end |
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266 |
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267 --- A table iterator generator that returns elements sorted by key, |
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268 -- to be used in "for" loops. |
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269 -- @param tbl table: The table to be iterated. |
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270 -- @param sort_function function or table or nil: An optional comparison function |
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271 -- to be used by table.sort when sorting keys, or an array listing an explicit order |
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272 -- for keys. If a value itself is an array, it is taken so that the first element |
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273 -- is a string representing the field name, and the second element is a priority table |
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274 -- for that key. |
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275 -- @return function: the iterator function. |
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276 function sortedpairs(tbl, sort_function) |
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277 return coroutine.wrap(function() sortedpairs_iterator(tbl, sort_function) end) |
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278 end |
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279 |
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280 function starts_with(s, prefix) |
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281 return s:sub(1,#prefix) == prefix |
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282 end |
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283 |
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284 --- Print a line to standard output |
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285 function printout(...) |
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286 io.stdout:write(table.concat({...},"\t")) |
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287 io.stdout:write("\n") |
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288 end |
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289 |
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290 --- Print a line to standard error |
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291 function printerr(...) |
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292 io.stderr:write(table.concat({...},"\t")) |
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293 io.stderr:write("\n") |
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294 end |
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295 |
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296 --- Display a warning message. |
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297 -- @param msg string: the warning message |
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298 function warning(msg) |
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299 printerr("Warning: "..msg) |
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300 end |
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301 |
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302 function title(msg, porcelain, underline) |
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303 if porcelain then return end |
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304 printout() |
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305 printout(msg) |
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306 printout((underline or "-"):rep(#msg)) |
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307 printout() |
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308 end |
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309 |
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310 -- from http://lua-users.org/wiki/SplitJoin |
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311 -- by PhilippeLhoste |
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312 function split_string(str, delim, maxNb) |
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313 -- Eliminate bad cases... |
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314 if string.find(str, delim) == nil then |
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315 return { str } |
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316 end |
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317 if maxNb == nil or maxNb < 1 then |
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318 maxNb = 0 -- No limit |
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319 end |
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320 local result = {} |
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321 local pat = "(.-)" .. delim .. "()" |
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322 local nb = 0 |
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323 local lastPos |
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324 for part, pos in string.gmatch(str, pat) do |
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325 nb = nb + 1 |
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326 result[nb] = part |
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327 lastPos = pos |
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328 if nb == maxNb then break end |
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329 end |
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330 -- Handle the last field |
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331 if nb ~= maxNb then |
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332 result[nb + 1] = string.sub(str, lastPos) |
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333 end |
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334 return result |
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335 end |
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336 |
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337 --- Remove repeated entries from a path-style string. |
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338 -- Example: given ("a;b;c;a;b;d", ";"), returns "a;b;c;d". |
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339 -- @param list string: A path string (from $PATH or package.path) |
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340 -- @param sep string: The separator |
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341 function remove_path_dupes(list, sep) |
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342 assert(type(list) == "string") |
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343 assert(type(sep) == "string") |
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344 local parts = split_string(list, sep) |
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345 local final, entries = {}, {} |
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346 for _, part in ipairs(parts) do |
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347 if not entries[part] then |
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348 table.insert(final, part) |
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349 entries[part] = true |
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350 end |
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351 end |
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352 return table.concat(final, sep) |
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353 end |
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354 |
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355 --- |
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356 -- Formats tables with cycles recursively to any depth. |
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357 -- References to other tables are shown as values. |
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358 -- Self references are indicated. |
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359 -- The string returned is "Lua code", which can be procesed |
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360 -- (in the case in which indent is composed by spaces or "--"). |
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361 -- Userdata and function keys and values are shown as strings, |
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362 -- which logically are exactly not equivalent to the original code. |
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363 -- This routine can serve for pretty formating tables with |
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364 -- proper indentations, apart from printing them: |
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365 -- io.write(table.show(t, "t")) -- a typical use |
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366 -- Written by Julio Manuel Fernandez-Diaz, |
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367 -- Heavily based on "Saving tables with cycles", PIL2, p. 113. |
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368 -- @param t table: is the table. |
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369 -- @param name string: is the name of the table (optional) |
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370 -- @param indent string: is a first indentation (optional). |
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371 -- @return string: the pretty-printed table |
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372 function show_table(t, name, indent) |
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373 local cart -- a container |
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374 local autoref -- for self references |
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375 |
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376 local function isemptytable(t) return next(t) == nil end |
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377 |
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378 local function basicSerialize (o) |
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379 local so = tostring(o) |
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380 if type(o) == "function" then |
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381 local info = debug.getinfo(o, "S") |
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382 -- info.name is nil because o is not a calling level |
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383 if info.what == "C" then |
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384 return ("%q"):format(so .. ", C function") |
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385 else |
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386 -- the information is defined through lines |
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387 return ("%q"):format(so .. ", defined in (" .. info.linedefined .. "-" .. info.lastlinedefined .. ")" .. info.source) |
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388 end |
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389 elseif type(o) == "number" then |
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390 return so |
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391 else |
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392 return ("%q"):format(so) |
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393 end |
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394 end |
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395 |
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396 local function addtocart (value, name, indent, saved, field) |
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397 indent = indent or "" |
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398 saved = saved or {} |
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399 field = field or name |
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400 |
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401 cart = cart .. indent .. field |
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402 |
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403 if type(value) ~= "table" then |
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404 cart = cart .. " = " .. basicSerialize(value) .. ";\n" |
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405 else |
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406 if saved[value] then |
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407 cart = cart .. " = {}; -- " .. saved[value] .. " (self reference)\n" |
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408 autoref = autoref .. name .. " = " .. saved[value] .. ";\n" |
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409 else |
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410 saved[value] = name |
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411 --if tablecount(value) == 0 then |
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412 if isemptytable(value) then |
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413 cart = cart .. " = {};\n" |
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414 else |
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415 cart = cart .. " = {\n" |
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416 for k, v in pairs(value) do |
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417 k = basicSerialize(k) |
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418 local fname = ("%s[%s]"):format(name, k) |
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419 field = ("[%s]"):format(k) |
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420 -- three spaces between levels |
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421 addtocart(v, fname, indent .. " ", saved, field) |
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422 end |
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423 cart = cart .. indent .. "};\n" |
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424 end |
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425 end |
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426 end |
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427 end |
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428 |
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429 name = name or "__unnamed__" |
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430 if type(t) ~= "table" then |
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431 return name .. " = " .. basicSerialize(t) |
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432 end |
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433 cart, autoref = "", "" |
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434 addtocart(t, name, indent) |
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435 return cart .. autoref |
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436 end |