prosody
dc7ab05005e8
util/format.lua

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util/format.lua @ 12035:dc7ab05005e8

util.format: Fix Lua 5.1 quirks thanks to ALL THE TESTS
author Kim Alvefur <zash@zash.se>
date Sat, 11 Dec 2021 20:40:23 +0100
parent 12033:161f8268c4b3
child 12036:2ce06f788093
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 --
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2 -- A string.format wrapper that gracefully handles invalid arguments
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3 --
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4
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5 local tostring = tostring;
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6 local unpack = table.unpack or unpack; -- luacheck: ignore 113/unpack
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7 local pack = require "util.table".pack; -- TODO table.pack in 5.2+
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8 local valid_utf8 = require "util.encodings".utf8.valid;
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9 local type = type;
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10 local dump = require "util.serialization".new("debug");
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11 local num_type = math.type or function (n)
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12 return n % 1 == 0 and n <= 9007199254740992 and n >= -9007199254740992 and "integer" or "float";
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13 end
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14
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15 -- In Lua 5.3+ these formats throw an error if given a float
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16 local expects_integer = { c = true, d = true, i = true, o = true, u = true, X = true, x = true, };
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17 -- Printable Unicode replacements for control characters
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18 local control_symbols = {
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19 -- 0x00 .. 0x1F --> U+2400 .. U+241F, 0x7F --> U+2421
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20 ["\000"] = "\226\144\128", ["\001"] = "\226\144\129", ["\002"] = "\226\144\130",
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21 ["\003"] = "\226\144\131", ["\004"] = "\226\144\132", ["\005"] = "\226\144\133",
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22 ["\006"] = "\226\144\134", ["\007"] = "\226\144\135", ["\008"] = "\226\144\136",
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23 ["\009"] = "\226\144\137", ["\010"] = "\226\144\138", ["\011"] = "\226\144\139",
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24 ["\012"] = "\226\144\140", ["\013"] = "\226\144\141", ["\014"] = "\226\144\142",
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25 ["\015"] = "\226\144\143", ["\016"] = "\226\144\144", ["\017"] = "\226\144\145",
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26 ["\018"] = "\226\144\146", ["\019"] = "\226\144\147", ["\020"] = "\226\144\148",
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27 ["\021"] = "\226\144\149", ["\022"] = "\226\144\150", ["\023"] = "\226\144\151",
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28 ["\024"] = "\226\144\152", ["\025"] = "\226\144\153", ["\026"] = "\226\144\154",
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29 ["\027"] = "\226\144\155", ["\028"] = "\226\144\156", ["\029"] = "\226\144\157",
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30 ["\030"] = "\226\144\158", ["\031"] = "\226\144\159", ["\127"] = "\226\144\161",
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31 };
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32 local supports_p = pcall(string.format, "%p", ""); -- >= Lua 5.4
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33 local supports_a = pcall(string.format, "%a", 0.0); -- > Lua 5.1
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34
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35 local function format(formatstring, ...)
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36 local args = pack(...);
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37 local args_length = args.n;
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38
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39 -- format specifier spec:
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40 -- 1. Start: '%%'
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41 -- 2. Flags: '[%-%+ #0]'
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42 -- 3. Width: '%d?%d?'
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43 -- 4. Precision: '%.?%d?%d?'
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44 -- 5. Option: '[cdiouxXaAeEfgGqs%%]'
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45 --
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46 -- The options c, d, E, e, f, g, G, i, o, u, X, and x all expect a number as argument, whereas q and s expect a string.
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47 -- This function does not accept string values containing embedded zeros, except as arguments to the q option.
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48 -- a and A are only in Lua 5.2+
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49 -- Lua 5.4 adds a p format that produces a pointer
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50
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51
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52 -- process each format specifier
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53 local i = 0;
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54 formatstring = formatstring:gsub("%%[^cdiouxXaAeEfgGpqs%%]*[cdiouxXaAeEfgGpqs%%]", function(spec)
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55 if spec == "%%" then return end
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56 i = i + 1;
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57 local arg = args[i];
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58
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59 if arg == nil then
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60 args[i] = "nil";
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61 return "(%s)";
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62 end
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63
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64 local option = spec:sub(-1);
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65 local t = type(arg);
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66
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67 if option == "s" and t == "string" and not arg:find("[%z\1-\31\128-\255]") then
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68 -- No UTF-8 or control characters, assumed to be the common case.
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69 return
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70 elseif option == "s" and t ~= "string" then
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71 args[i] = tostring(arg);
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72 end
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73
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74 if option ~= "s" and option ~= "q" and option ~= "p" then
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75 -- all other options expect numbers
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76 if t ~= "number" then
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77 -- arg isn't number as expected?
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78 arg = tostring(arg);
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79 option = "s";
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80 spec = "[%s]";
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81 t = "string";
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82 elseif expects_integer[option] and num_type(arg) ~= "integer" then
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83 args[i] = tostring(arg);
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84 return "[%s]";
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85 elseif (option == "a" or option == "A") and not supports_a then
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86 return "%x";
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87 else
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88 return -- acceptable number
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89 end
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90 end
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91
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92
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93 if option == "p" and not supports_p then
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94 arg = tostring(arg);
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95 option = "s";
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96 spec = "[%s]";
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97 t = "string";
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98 end
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99
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100 if t == "string" and option ~= "p" then
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101 if not valid_utf8(arg) then
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102 option = "q";
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103 else
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104 args[i] = arg:gsub("[%z\1-\8\11-\31\127]", control_symbols):gsub("\n\t?", "\n\t");
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105 return spec;
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106 end
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107 end
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108
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109 if option == "q" then
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110 args[i] = dump(arg);
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111 return "%s";
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112 end
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113
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114 if option == "p" and (t == "boolean" or t == "number") then
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115 args[i] = tostring(arg);
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116 return "[%s]";
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117 end
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118 end);
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119
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120 -- process extra args
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121 while i < args_length do
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122 i = i + 1;
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123 local arg = args[i];
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124 if arg == nil then
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125 args[i] = "(nil)";
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126 else
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127 args[i] = tostring(arg):gsub("[%z\1-\8\11-\31\127]", control_symbols):gsub("\n\t?", "\n\t");
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128 end
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129 formatstring = formatstring .. " [%s]"
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130 end
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131
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132 return formatstring:format(unpack(args));
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133 end
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134
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135 return {
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136 format = format;
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137 };