1 | var util = require("util"),
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2 | vm = require("vm");
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3 |
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4 |
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5 |
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6 |
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7 |
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8 | JSON.Command = function(args) {
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9 | this.args = null;
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10 |
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11 | this.debugOn = false;
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12 | this.fileNames = [];
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13 | this.files = null;
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14 | this.keys = [];
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15 | this.transformedKeys = [];
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16 | this.uglyOutput = false;
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17 | this.inspectOutput = false;
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18 | this.headerPassthrough = false;
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19 | this.columnOutput = false;
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20 | this.useObject = null;
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21 | this.inputIsArray = false;
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22 |
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23 | this.conditionals = [];
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24 | this.executables = [];
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25 |
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26 | this.stdin = null;
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27 | this.buffer = "";
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28 |
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29 | if (args) { this.processArgs(args); }
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30 | };
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31 |
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32 | JSON.Command.prototype.printhelp = function() {
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33 | console.log("usage: stdout_generator | json [options] [fields]");
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34 | console.log("");
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35 | console.log("json processes standard input and parses json objects. json currently handles a");
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36 | console.log("few different standard input formats and provides a number of options tailored");
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37 | console.log("toward inspecting and transforming the parsed json objects.");
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38 | console.log("");
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39 | console.log("options:\n");
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40 | console.log(" -h print this help info and exit\n");
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41 | console.log(" -v (-V | --version) print version number and exit\n");
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42 | console.log(" -u print ugly json output, each object on a single line\n");
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43 | console.log(" -d print debugging output including exception messages\n");
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44 | console.log(" -o object.path specify the path to an array to be iterated on\n");
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45 | console.log(" new.key=old_key move old_key to new.key in output object\n");
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46 | console.log(" -a input object is an array, process each element separately\n");
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47 | console.log(" -c \"js conditional\" js conditional to be run in the context of each object");
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48 | console.log(" that determines whether an object is printed\n");
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49 | console.log(" -C print the output fields as tab delimited columns in");
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50 | console.log(" the order specified by fields\n");
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51 | console.log(" -e \"js expression\" execute arbitrary js in the context of each object.\n");
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52 | console.log(" -i use node's util.inspect instead of JSON.stringify\n");
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53 | console.log(" -H print headers, if they are supplied.");
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54 | console.log(" Useful for output from curl -i.\n");
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55 |
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56 | console.log("examples:\n");
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57 | console.log(" curl http://search.twitter.com/search.json?q=node.js 2> /dev/null |");
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58 | console.log(" json -o results\n");
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59 | console.log(" curl http://search.twitter.com/search.json?q=node.js 2> /dev/null |");
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60 | console.log(" json -o results new_id=id\n");
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61 | console.log(" curl http://search.twitter.com/search.json?q=node.js 2> /dev/null |");
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62 | console.log(" json -o results -C from_user from_user_id text\n");
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63 | console.log("more help:\n");
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64 | console.log(" use \"man json\" or visit http://github.com/zpoley/json-command\n");
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65 | process.exit();
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66 | };
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67 |
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68 | JSON.Command.prototype.printversion = function() {
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69 | var npm = require("npm");
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70 | npm.load([], function(er) {
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71 | console.log("json command line toolkit\n version: ");
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72 | npm.commands.view([ "json", "version" ], function(er, data) {
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73 | process.exit();
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74 | });
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75 | });
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76 | };
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77 |
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78 |
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79 | JSON.Command.prototype.stringify = function(obj) {
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80 | return( this.inspectOutput ? util.inspect(obj, false, Infinity, true)
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81 | : this.uglyOutput ? JSON.stringify(obj)
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82 | : JSON.stringify(obj, null, 2) );
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83 | };
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84 |
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85 | JSON.Command.prototype.debug = function(msg) {
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86 | if (this.debugOn) { console.log(msg); }
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87 | };
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88 |
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89 | JSON.Command.prototype.printex = function(ex) {
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90 | this.debug("ex: " + JSON.stringify(ex, null, 2));
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91 | };
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92 |
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93 |
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94 |
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95 |
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96 |
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97 | JSON.Command.prototype.processArgs = function processArgs(args) {
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98 |
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99 |
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100 | var a = args.slice(0);
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101 |
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102 |
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103 | for (var i = 0; i < a.length; i ++) {
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104 | if (a[i].charAt(0) === "-" && a[i].length > 2) {
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105 | var arg = a[i].replace(/^-+/, "").split("").map(function (a) {
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106 | return "-" + a;
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107 | });
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108 | a.splice.apply(a, [i, 1].concat(arg));
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109 | }
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110 | }
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111 |
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112 | while (a.length > 0) {
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113 | var arg = a.shift();
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114 | switch(arg) {
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115 | case "-h":
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116 | this.printhelp();
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117 | break;
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118 | case "-v":
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119 | case "-V":
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120 | case "--version":
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121 | this.printversion();
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122 | break;
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123 | case "-f":
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124 | this.fileNames.push(a.shift());
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125 | break;
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126 | case "-d":
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127 | this.debugOn = true;
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128 | break;
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129 | case "-u":
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130 | this.uglyOutput = true;
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131 | break;
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132 | case "-c":
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133 | this.conditionals.push(a.shift());
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134 | break;
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135 | case "-C":
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136 | this.columnOutput = true;
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137 | break;
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138 | case "-e":
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139 | this.executables.push(a.shift());
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140 | break;
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141 | case "-o":
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142 | this.useObject = a.shift();
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143 | break;
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144 | case "-a":
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145 | this.inputIsArray = true;
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146 | break;
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147 | case "-i":
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148 | this.inspectOutput = true;
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149 | break;
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150 | case "-H":
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151 | this.headerPassthrough = true;
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152 | break;
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153 | default:
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154 | if (arg.match("=")) {
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155 | var kk = arg.split("=");
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156 | this.keys.push(kk[0]);
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157 | this.transformedKeys.push({
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158 | newKey : kk[0],
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159 | oldKey : kk[1]
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160 | });
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161 | }
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162 | else {
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163 | this.keys.push(arg);
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164 | }
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165 | break;
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166 | }
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167 | }
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168 | };
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169 |
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170 |
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171 |
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172 |
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173 |
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174 |
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175 | JSON.Command.prototype.createRequestedKeys = function(parsedObject) {
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176 |
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177 | for(var j = 0; (j < this.keys.length); j++) {
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178 | if (typeof(parsedObject[this.keys[j]]) === 'undefined') {
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179 | parsedObject[this.keys[j]] = null;
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180 | }
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181 | }
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182 | };
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183 |
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184 |
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185 |
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186 |
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187 |
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188 | JSON.Command.prototype.checkConditionals = function(parsedObject) {
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189 | if (this.conditionals.length) {
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190 | try {
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191 | var conditionsFailed = false;
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192 | for(var i = 0; (i < this.conditionals.length); i++) {
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193 | if (!vm.runInNewContext(this.conditionals[i], parsedObject)) {
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194 | conditionsFailed = true;
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195 | }
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196 | }
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197 |
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198 | if (conditionsFailed) { return false; }
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199 | }
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200 | catch(ex) {
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201 |
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202 |
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203 | this.printex(ex);
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204 | return false;
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205 | }
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206 | }
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207 |
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208 | return true;
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209 | };
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210 |
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211 |
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212 |
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213 |
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214 |
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215 | JSON.Command.prototype.processKeyTransforms = function(parsedObject) {
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216 | if (this.transformedKeys.length) {
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217 | for(var i = 0; (i < this.transformedKeys.length); i++) {
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218 | try {
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219 | vm.runInNewContext(this.transformedKeys[i].newKey +
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220 | " = " + this.transformedKeys[i].oldKey, parsedObject)
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221 | }
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222 | catch (ex) {
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223 | this.printex(ex);
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224 | }
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225 | }
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226 | }
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227 | };
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228 |
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229 |
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230 |
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231 |
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232 |
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233 | JSON.Command.prototype.processExecutables = function(parsedObject) {
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234 | if (this.executables.length) {
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235 | for(var i = 0; (i < this.executables.length); i++) {
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236 | try {
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237 | vm.runInNewContext(this.executables[i], parsedObject);
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238 | }
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239 | catch (ex) {
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240 |
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241 |
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242 | this.printex(ex);
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243 | }
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244 | }
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245 | }
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246 | };
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247 |
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248 |
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249 |
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250 |
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251 |
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252 |
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253 |
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254 |
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255 |
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256 |
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257 |
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258 |
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259 |
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260 |
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261 |
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262 |
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263 |
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264 |
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265 | JSON.Command.prototype.processKeys = function(parsedObject) {
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266 | if (this.keys.length) {
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267 | var hsh = {}, cols = [], evalStr = null, instStr = null, simpleKey = null;
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268 | function instantiateArrayAndPush(key) {
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269 | simpleKey = key.split("[").shift();
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270 |
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271 | instStr = "if (!hsh." + simpleKey + ") { hsh." + simpleKey + " = []; }";
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272 | eval(instStr);
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273 |
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274 | evalStr = "hsh." + simpleKey + ".push(" + "parsedObject." + key + ")";
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275 | eval(evalStr);
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276 | cols.push(eval("parsedObject." + key));
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277 | }
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278 | for (var i = 0; (i < this.keys.length); i++) {
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279 | try {
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280 | if ((this.keys[i].indexOf(".") > -1) || (this.keys[i].indexOf("[") > -1)) {
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281 |
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282 | if (this.keys[i].indexOf(".") > -1) {
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283 | var s = this.keys[i].split(".");
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284 | for (var j = 1; (j < s.length); j++) {
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285 |
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286 | evalStr = "hsh." + s.slice(0,j).join(".");
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287 | if (!eval(evalStr)) {
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288 | eval("hsh." + s.slice(0,j).join(".") + " = {};");
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289 | }
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290 | }
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291 | if (this.keys[i].indexOf("[") > -1) {
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292 | instantiateArrayAndPush(this.keys[i]);
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293 | }
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294 | else {
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295 | evalStr = "hsh." + s.join(".") + " = " + "parsedObject." + s.join(".");
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296 | eval(evalStr);
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297 | cols.push(eval("parsedObject." + s.join(".")));
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298 | }
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299 | }
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300 | else if (this.keys[i].indexOf("[") > -1) {
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301 | instantiateArrayAndPush(this.keys[i]);
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302 | }
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303 | }
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304 | else {
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305 |
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306 | hsh[this.keys[i]] = parsedObject[this.keys[i]];
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307 | cols.push(parsedObject[this.keys[i]]);
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308 | }
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309 | }
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310 | catch(ex) {
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311 | this.debug("Failed to read property " + this.keys[i] + " from object: " + JSON.stringify(parsedObject));
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312 | ex.message = "Failed to read property";
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313 | throw ex;
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314 | }
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315 | }
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316 | return this.columnOutput ? cols : hsh;
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317 | }
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318 | else {
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319 | return parsedObject;
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320 | }
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321 | };
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322 |
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323 |
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324 |
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325 |
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326 |
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327 | JSON.Command.prototype.processObjects = function(objects) {
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328 |
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329 | var rawObject = null, parsedObject = null;
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330 |
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331 | try {
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332 | if (this.useObject && objects && objects.length > 0 && typeof(objects[0]) == 'string' && objects[0].trim().length > 0) {
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333 | objects = vm.runInNewContext(this.useObject, JSON.parse(objects[0]));
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334 | }
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335 | }
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336 | catch(ex) {
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337 | this.printex(ex);
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338 | }
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339 |
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340 | if (this.inputIsArray && objects && objects.length > 0 && typeof(objects[0]) == 'string') {
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341 | var trimmed = objects[0].trim();
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342 | if (trimmed.length > 0 && trimmed[0] == '[') {
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343 | objects = JSON.parse(objects[0]);
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344 | }
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345 | }
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346 |
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347 | try {
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348 | for (var i = 0; (i < (objects.length)); i++) {
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349 |
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350 |
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351 | if ((objects[i] == null) || (objects[i] == undefined)) { continue; }
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352 |
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353 | try {
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354 | if (typeof(objects[i]) == "string") {
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355 | rawObject = objects[i];
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356 | if (rawObject.trim().length == 0) continue;
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357 | parsedObject = JSON.parse(rawObject);
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358 | }
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359 | else {
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360 | rawObject = JSON.stringify(objects[i]);
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361 | parsedObject = objects[i];
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362 | }
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363 | } catch(ex) {
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364 |
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365 | this.printex(ex);
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366 | continue;
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367 | }
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368 |
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369 |
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370 | this.createRequestedKeys(parsedObject);
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371 |
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372 |
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373 | this.processKeyTransforms(parsedObject);
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374 |
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375 |
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376 | this.processExecutables(parsedObject);
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377 |
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378 |
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379 | if (!this.checkConditionals(parsedObject)) {
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380 | continue;
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381 | }
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382 |
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383 | try {
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384 |
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385 | outputObject = this.processKeys(parsedObject);
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386 | }
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387 | catch(ex) { continue; }
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388 |
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389 |
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390 | if (this.columnOutput) {
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391 | process.stdout.write(outputObject.join("\t") + "\n");
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392 | }
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393 | else {
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394 | process.stdout.write(this.stringify(outputObject) + "\n");
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395 | }
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396 | }
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397 | }
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398 | catch(ex) {
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399 | this.printex(ex);
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400 | }
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401 | };
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402 |
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403 |
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404 |
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405 |
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406 |
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407 | JSON.Command.prototype.processInput = function() {
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408 | if (this.files) {
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409 |
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410 | }
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411 | else {
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412 | this.stdin = process.openStdin();
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413 | this.stdin.setEncoding("utf8");
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414 | this.stdin.jsonC = this;
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415 |
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416 | this.stdin.on("data", function(chunk) {
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417 | this.jsonC.buffer += chunk;
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418 | if (this.jsonC.inputIsArray) return;
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419 |
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420 | var objects = null;
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421 | if (this.jsonC.buffer.match(/\n/g) ||
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422 | this.jsonC.buffer.match(/\r\n/g) ||
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423 | this.jsonC.buffer.match(/\0/g) ||
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424 | this.jsonC.buffer.match("}{")) {
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425 | if (this.jsonC.buffer.match(/\n/g)) {
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426 | objects = this.jsonC.buffer.split("\n");
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427 | }
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428 | if (this.jsonC.buffer.match(/\r\n/g)) {
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429 | objects = this.jsonC.buffer.split("\r\n");
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430 | }
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431 | if (this.jsonC.buffer.match(/\0/g)) {
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432 | objects = this.jsonC.buffer.split("\0");
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433 | }
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434 | if (this.jsonC.buffer.match("}{")) {
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435 | objects = this.jsonC.buffer.split("}{").join("}\n{").split("\n");
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436 | }
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437 |
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438 | this.jsonC.buffer = objects.pop();
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439 |
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440 | if (this.jsonC.headerPassthrough) {
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441 | for (var i = 0, l = objects.length; i < l; i ++) {
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442 | process.stdout.write(objects[i]+"\r\n");
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443 | if (objects[i] === "") {
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444 | this.jsonC.headerPassthrough = false;
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445 | break;
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446 | }
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447 | }
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448 | objects.splice(0, i);
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449 | }
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450 |
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451 | if (objects.length) this.jsonC.processObjects(objects);
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452 | }
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453 | });
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454 |
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455 | var handleEPIPE = function(e) {
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456 | if (e.code !== "EPIPE") {
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457 | process.emit("error", e);
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458 | }
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459 | };
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460 | process.stdout.on("error", handleEPIPE);
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461 |
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462 | this.stdin.on("end", function() {
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463 | this.jsonC.processObjects([this.jsonC.buffer, null]);
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464 | process.stdout.removeListener("error", handleEPIPE);
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465 | });
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466 | }
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467 | };
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468 |
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469 |
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