--- /dev/null
+#!/usr/bin/env node
+/**
+ * Copyright (c) 2014 Trent Mick. All rights reserved.
+ * Copyright (c) 2014 Joyent Inc. All rights reserved.
+ *
+ * json -- JSON love for your command line.
+ *
+ * See <https://github.com/trentm/json> and <https://trentm.com/json/>
+ */
+
+var VERSION = '9.0.3';
+
+var p = console.warn;
+var util = require('util');
+var assert = require('assert');
+var path = require('path');
+var vm = require('vm');
+var fs = require('fs');
+var warn = console.warn;
+var EventEmitter = require('events').EventEmitter;
+
+
+
+//--- exports for module usage
+
+exports.main = main;
+exports.getVersion = getVersion;
+exports.parseLookup = parseLookup;
+
+// As an exported API, these are still experimental:
+exports.lookupDatum = lookupDatum;
+exports.printDatum = printDatum; // DEPRECATED
+
+
+
+//---- globals and constants
+
+// Output modes.
+var OM_JSONY = 1;
+var OM_JSON = 2;
+var OM_INSPECT = 3;
+var OM_COMPACT = 4;
+var OM_FROM_NAME = {
+ 'jsony': OM_JSONY,
+ 'json': OM_JSON,
+ 'inspect': OM_INSPECT,
+ 'compact': OM_COMPACT
+}
+
+
+
+//---- support functions
+
+function getVersion() {
+ return VERSION;
+}
+
+/**
+ * Return a *shallow* copy of the given object.
+ *
+ * Only support objects that you get out of JSON, i.e. no functions.
+ */
+function objCopy(obj) {
+ var copy;
+ if (Array.isArray(obj)) {
+ copy = obj.slice();
+ } else if (typeof (obj) === 'object') {
+ copy = {};
+ Object.keys(obj).forEach(function (k) {
+ copy[k] = obj[k];
+ });
+ } else {
+ copy = obj; // immutable type
+ }
+ return copy;
+}
+
+if (util.format) {
+ format = util.format;
+} else {
+ // From <https://github.com/joyent/node/blob/master/lib/util.js#L22>:
+ var formatRegExp = /%[sdj%]/g;
+
+ function format(f) {
+ if (typeof (f) !== 'string') {
+ var objects = [];
+ for (var i = 0; i < arguments.length; i++) {
+ objects.push(util.inspect(arguments[i]));
+ }
+ return objects.join(' ');
+ }
+ var i = 1;
+ var args = arguments;
+ var len = args.length;
+ var str = String(f).replace(formatRegExp, function (x) {
+ if (i >= len)
+ return x;
+ switch (x) {
+ case '%s':
+ return String(args[i++]);
+ case '%d':
+ return Number(args[i++]);
+ case '%j':
+ return JSON.stringify(args[i++]);
+ case '%%':
+ return '%';
+ default:
+ return x;
+ }
+ });
+ for (var x = args[i]; i < len; x = args[++i]) {
+ if (x === null || typeof (x) !== 'object') {
+ str += ' ' + x;
+ } else {
+ str += ' ' + util.inspect(x);
+ }
+ }
+ return str;
+ };
+}
+
+/**
+ * Parse the given string into a JS string. Basically: handle escapes.
+ */
+function _parseString(s) {
+ /* JSSTYLED */
+ var quoted = '"' + s.replace(/\\"/, '"').replace('"', '\\"') + '"';
+ return eval(quoted);
+}
+
+// json_parse.js (<https://github.com/douglascrockford/JSON-js>)
+/* BEGIN JSSTYLED */
+// START json_parse
+var json_parse=function(){"use strict";var a,b,c={'"':'"',"\\":"\\","/":"/",b:"\b",f:"\f",n:"\n",r:"\r",t:"\t"},d,e=function(b){throw{name:"SyntaxError",message:b,at:a,text:d}},f=function(c){return c&&c!==b&&e("Expected '"+c+"' instead of '"+b+"'"),b=d.charAt(a),a+=1,b},g=function(){var a,c="";b==="-"&&(c="-",f("-"));while(b>="0"&&b<="9")c+=b,f();if(b==="."){c+=".";while(f()&&b>="0"&&b<="9")c+=b}if(b==="e"||b==="E"){c+=b,f();if(b==="-"||b==="+")c+=b,f();while(b>="0"&&b<="9")c+=b,f()}a=+c;if(!isFinite(a))e("Bad number");else return a},h=function(){var a,d,g="",h;if(b==='"')while(f()){if(b==='"')return f(),g;if(b==="\\"){f();if(b==="u"){h=0;for(d=0;d<4;d+=1){a=parseInt(f(),16);if(!isFinite(a))break;h=h*16+a}g+=String.fromCharCode(h)}else if(typeof c[b]=="string")g+=c[b];else break}else g+=b}e("Bad string")},i=function(){while(b&&b<=" ")f()},j=function(){switch(b){case"t":return f("t"),f("r"),f("u"),f("e"),!0;case"f":return f("f"),f("a"),f("l"),f("s"),f("e"),!1;case"n":return f("n"),f("u"),f("l"),f("l"),null}e("Unexpected '"+b+"'")},k,l=function(){var a=[];if(b==="["){f("["),i();if(b==="]")return f("]"),a;while(b){a.push(k()),i();if(b==="]")return f("]"),a;f(","),i()}}e("Bad array")},m=function(){var a,c={};if(b==="{"){f("{"),i();if(b==="}")return f("}"),c;while(b){a=h(),i(),f(":"),Object.hasOwnProperty.call(c,a)&&e('Duplicate key "'+a+'"'),c[a]=k(),i();if(b==="}")return f("}"),c;f(","),i()}}e("Bad object")};return k=function(){i();switch(b){case"{":return m();case"[":return l();case'"':return h();case"-":return g();default:return b>="0"&&b<="9"?g():j()}},function(c,f){var g;return d=c,a=0,b=" ",g=k(),i(),b&&e("Syntax error"),typeof f=="function"?function h(a,b){var c,d,e=a[b];if(e&&typeof e=="object")for(c in e)Object.prototype.hasOwnProperty.call(e,c)&&(d=h(e,c),d!==undefined?e[c]=d:delete e[c]);return f.call(a,b,e)}({"":g},""):g}}();
+// END json_parse
+/* END JSSTYLED */
+
+function printHelp() {
+ /* BEGIN JSSTYLED */
+ var w = console.log;
+ w('Usage:');
+ w(' <something generating JSON on stdout> | json [OPTIONS] [LOOKUPS...]');
+ w(' json -f FILE [OPTIONS] [LOOKUPS...]');
+ w('');
+ w('Pipe in your JSON for pretty-printing, JSON validation, filtering, ');
+ w('and modification. Supply one or more `LOOKUPS` to extract a ');
+ w('subset of the JSON. HTTP header blocks are skipped by default.');
+ w('Roughly in order of processing, features are:');
+ w('');
+ w('Grouping:');
+ w(' Use "-g" or "--group" to group adjacent objects, separated by');
+ w(' by no space or a by a newline, or adjacent arrays, separate by');
+ w(' by a newline. This can be helpful for, e.g.: ');
+ w(' $ cat *.json | json -g ... ');
+ w(' and similar.');
+ w('');
+ w('Execution:');
+ w(' Use the "-e CODE" option to execute JavaScript code on the input JSON.');
+ w(' $ echo \'{"name":"trent","age":38}\' | json -e \'this.age++\'');
+ w(' {');
+ w(' "name": "trent",');
+ w(' "age": 39');
+ w(' }');
+ w(' If input is an array, this will automatically process each');
+ w(' item separately.');
+ w('');
+ w('Conditional filtering:');
+ w(' Use the "-c CODE" option to filter the input JSON.');
+ w(' $ echo \'[{"age":38},{"age":4}]\' | json -c \'this.age>21\'');
+ w(' [{\'age\':38}]');
+ w(' If input is an array, this will automatically process each');
+ w(' item separately. Note: "CODE" is JavaScript code.');
+ w('');
+ w('Lookups:');
+ w(' Use lookup arguments to extract particular values:');
+ w(' $ echo \'{"name":"trent","age":38}\' | json name');
+ w(' trent');
+ w('');
+ w(' Use "-a" for *array processing* of lookups and *tabular output*:');
+ w(' $ echo \'{"name":"trent","age":38}\' | json name age');
+ w(' trent');
+ w(' 38');
+ w(' $ echo \'[{"name":"trent","age":38},');
+ w(' {"name":"ewan","age":4}]\' | json -a name age');
+ w(' trent 38');
+ w(' ewan 4');
+ w('');
+ w('In-place editing:');
+ w(' Use "-I, --in-place" to edit a file in place:');
+ w(' $ json -I -f config.json # reformat');
+ w(' $ json -I -f config.json -c \'this.logLevel="debug"\' # add field');
+ w('');
+ w('Pretty-printing:');
+ w(' Output is "jsony" by default: 2-space indented JSON, except a');
+ w(' single string value is printed without quotes.');
+ w(' $ echo \'{"name": "trent", "age": 38}\' | json');
+ w(' {');
+ w(' "name": "trent",');
+ w(' "age": 38');
+ w(' }');
+ w(' $ echo \'{"name": "trent", "age": 38}\' | json name');
+ w(' trent');
+ w('');
+ w(" Use '-j' or '-o json' for explicit JSON, '-o json-N' for N-space indent:");
+ w(' $ echo \'{"name": "trent", "age": 38}\' | json -o json-0');
+ w(' {"name":"trent","age":38}');
+ w('');
+ w('Options:');
+ w(' -h, --help Print this help info and exit.');
+ w(' --version Print version of this command and exit.');
+ w(' -q, --quiet Don\'t warn if input isn\'t valid JSON.');
+ w('');
+ w(' -f FILE Path to a file to process. If not given, then');
+ w(' stdin is used.');
+ w(' -I, --in-place In-place edit of the file given with "-f".');
+ w(' Lookups are not allow with in-place editing');
+ w(' because it makes it too easy to lose content.');
+ w('');
+ w(' -H Drop any HTTP header block (as from `curl -i ...`).');
+ w(' -g, --group Group adjacent objects or arrays into an array.');
+ w(' --merge Merge adjacent objects into one. Keys in last ');
+ w(' object win.');
+ w(' --deep-merge Same as "--merge", but will recurse into objects ');
+ w(' under the same key in both.')
+ w(' -a, --array Process input as an array of separate inputs');
+ w(' and output in tabular form.');
+ w(' -A Process input as a single object, i.e. stop');
+ w(' "-e" and "-c" automatically processing each');
+ w(' item of an input array.');
+ w(' -d DELIM Delimiter char for tabular output (default is " ").');
+ w(' -D DELIM Delimiter char between lookups (default is "."). E.g.:');
+ w(' $ echo \'{"a.b": {"b": 1}}\' | json -D / a.b/b');
+ w('');
+ w(' -M, --items Itemize an object into an array of ');
+ w(' {"key": <key>, "value": <value>}');
+ w(' objects for easier processing.');
+ w('');
+ w(' -e CODE Execute the given JavaScript code on the input. If input');
+ w(' is an array, then each item of the array is processed');
+ w(' separately (use "-A" to override).');
+ w(' -c CODE Filter the input with JavaScript `CODE`. If `CODE`');
+ w(' returns false-y, then the item is filtered out. If');
+ w(' input is an array, then each item of the array is ');
+ w(' processed separately (use "-A" to override).');
+ w('');
+ w(' -k, --keys Output the input object\'s keys.');
+ w(' -n, --validate Just validate the input (no processing or output).');
+ w(' Use with "-q" for silent validation (exit status).');
+ w('');
+ w(' -o, --output MODE');
+ w(' Specify an output mode. One of:');
+ w(' jsony (default): JSON with string quotes elided');
+ w(' json: JSON output, 2-space indent');
+ w(' json-N: JSON output, N-space indent, e.g. "json-4"');
+ w(' inspect: node.js `util.inspect` output');
+ w(' -i Shortcut for `-o inspect`');
+ w(' -j Shortcut for `-o json`');
+ w(' -0, -2, -4 Set indentation to the given value w/o setting MODE.');
+ w(' -0 => -o jsony-0');
+ w(' -4 => -o jsony-4');
+ w(' -j0 => -o json-0');
+ w('');
+ w('See <http://trentm.com/json> for more docs and ');
+ w('<https://github.com/trentm/json> for project details.');
+ /* END JSSTYLED */
+}
+
+
+/**
+ * Parse the command-line options and arguments into an object.
+ *
+ * {
+ * 'args': [...] // arguments
+ * 'help': true, // true if '-h' option given
+ * // etc.
+ * }
+ *
+ * @return {Object} The parsed options. `.args` is the argument list.
+ * @throws {Error} If there is an error parsing argv.
+ */
+function parseArgv(argv) {
+ var parsed = {
+ args: [],
+ help: false,
+ quiet: false,
+ dropHeaders: false,
+ exeSnippets: [],
+ condSnippets: [],
+ outputMode: OM_JSONY,
+ jsonIndent: 2,
+ array: null,
+ delim: ' ',
+ lookupDelim: '.',
+ items: false,
+ outputKeys: false,
+ group: false,
+ merge: null, // --merge -> 'shallow', --deep-merge -> 'deep'
+ inputFiles: [],
+ validate: false,
+ inPlace: false
+ };
+
+ // Turn '-iH' into '-i -H', except for argument-accepting options.
+ var args = argv.slice(2); // drop ['node', 'scriptname']
+ var newArgs = [];
+ var optTakesArg = {
+ 'd': true,
+ 'o': true,
+ 'D': true
+ };
+ for (var i = 0; i < args.length; i++) {
+ if (args[i] === '--') {
+ newArgs = newArgs.concat(args.slice(i));
+ break;
+ }
+ if (args[i].charAt(0) === '-' && args[i].charAt(1) !== '-' &&
+ args[i].length > 2)
+ {
+ var splitOpts = args[i].slice(1).split('');
+ for (var j = 0; j < splitOpts.length; j++) {
+ newArgs.push('-' + splitOpts[j])
+ if (optTakesArg[splitOpts[j]]) {
+ var optArg = splitOpts.slice(j + 1).join('');
+ if (optArg.length) {
+ newArgs.push(optArg);
+ }
+ break;
+ }
+ }
+ } else {
+ newArgs.push(args[i]);
+ }
+ }
+ args = newArgs;
+
+ endOfOptions = false;
+ while (args.length > 0) {
+ var arg = args.shift();
+ if (endOfOptions) {
+ parsed.args.push(arg);
+ break;
+ }
+ switch (arg) {
+ case '--':
+ endOfOptions = true;
+ break;
+ case '-h': // display help and exit
+ case '--help':
+ parsed.help = true;
+ break;
+ case '--version':
+ parsed.version = true;
+ break;
+ case '-q':
+ case '--quiet':
+ parsed.quiet = true;
+ break;
+ case '-H': // drop any headers
+ parsed.dropHeaders = true;
+ break;
+ case '-o':
+ case '--output':
+ var name = args.shift();
+ if (!name) {
+ throw new Error('no argument given for "-o|--output" option');
+ }
+ var idx = name.lastIndexOf('-');
+ if (idx !== -1) {
+ var indent = name.slice(idx + 1);
+ if (/^\d+$/.test(indent)) {
+ parsed.jsonIndent = Number(indent);
+ name = name.slice(0, idx);
+ } else if (indent === 'tab') {
+ parsed.jsonIndent = '\t';
+ name = name.slice(0, idx);
+ }
+ }
+ parsed.outputMode = OM_FROM_NAME[name];
+ if (parsed.outputMode === undefined) {
+ throw new Error('unknown output mode: "' + name + '"');
+ }
+ break;
+ case '-0':
+ parsed.jsonIndent = 0;
+ break;
+ case '-2':
+ parsed.jsonIndent = 2;
+ break;
+ case '-4':
+ parsed.jsonIndent = 4;
+ break;
+ case '-I':
+ case '--in-place':
+ parsed.inPlace = true;
+ break;
+ case '-i': // output with util.inspect
+ parsed.outputMode = OM_INSPECT;
+ break;
+ case '-j': // output with JSON.stringify
+ parsed.outputMode = OM_JSON;
+ break;
+ case '-a':
+ case '--array':
+ parsed.array = true;
+ break;
+ case '-A':
+ parsed.array = false;
+ break;
+ case '-d':
+ parsed.delim = _parseString(args.shift());
+ break;
+ case '-D':
+ parsed.lookupDelim = args.shift();
+ if (parsed.lookupDelim.length !== 1) {
+ throw new Error(format(
+ 'invalid lookup delim "%s" (must be a single char)',
+ parsed.lookupDelim));
+ }
+ break;
+ case '-e':
+ case '-E': // DEPRECATED in v9
+ parsed.exeSnippets.push(args.shift());
+ break;
+ case '-c':
+ case '-C': // DEPRECATED in v9
+ parsed.condSnippets.push(args.shift());
+ break;
+ case '-M':
+ case '--items':
+ parsed.items = true;
+ break;
+ case '-k':
+ case '--keys':
+ parsed.outputKeys = true;
+ break;
+ case '-g':
+ case '--group':
+ parsed.group = true;
+ break;
+ case '--merge':
+ parsed.merge = 'shallow';
+ break;
+ case '--deep-merge':
+ parsed.merge = 'deep';
+ break;
+ case '-f':
+ parsed.inputFiles.push(args.shift());
+ break;
+ case '-n':
+ case '--validate':
+ parsed.validate = true;
+ break;
+ default: // arguments
+ if (!endOfOptions && arg.length > 0 && arg[0] === '-') {
+ throw new Error('unknown option "' + arg + '"');
+ }
+ parsed.args.push(arg);
+ break;
+ }
+ }
+
+ if (parsed.group && parsed.merge) {
+ throw new Error('cannot use -g|--group and --merge options together');
+ }
+ if (parsed.outputKeys && parsed.args.length > 0) {
+ throw new Error(
+ 'cannot use -k|--keys option and lookup arguments together');
+ }
+ if (parsed.inPlace && parsed.inputFiles.length !== 1) {
+ throw new Error('must specify exactly one file with "-f FILE" to ' +
+ 'use -I/--in-place');
+ }
+ if (parsed.inPlace && parsed.args.length > 0) {
+ throw new Error('lookups cannot be specified with in-place editing ' +
+ '(-I/--in-place), too easy to lose content');
+ }
+
+ return parsed;
+}
+
+
+
+/**
+ * Streams chunks from given file paths or stdin.
+ *
+ * @param opts {Object} Parsed options.
+ * @returns {Object} An emitter that emits 'chunk', 'error', and 'end'.
+ * - `emit('chunk', chunk, [obj])` where chunk is a complete block of JSON
+ * ready to parse. If `obj` is provided, it is the already parsed
+ * JSON.
+ * - `emit('error', error)` when an underlying stream emits an error
+ * - `emit('end')` when all streams are done
+ */
+function chunkEmitter(opts) {
+ var emitter = new EventEmitter();
+ var streaming = true;
+ var chunks = [];
+ var leftover = '';
+ var finishedHeaders = false;
+
+ function stripHeaders(s) {
+ // Take off a leading HTTP header if any and pass it through.
+ while (true) {
+ if (s.slice(0, 5) === 'HTTP/') {
+ var index = s.indexOf('\r\n\r\n');
+ var sepLen = 4;
+ if (index == -1) {
+ index = s.indexOf('\n\n');
+ sepLen = 2;
+ }
+ if (index != -1) {
+ if (!opts.dropHeaders) {
+ emit(s.slice(0, index + sepLen));
+ }
+ var is100Continue = (
+ s.slice(0, 21) === 'HTTP/1.1 100 Continue');
+ s = s.slice(index + sepLen);
+ if (is100Continue) {
+ continue;
+ }
+ finishedHeaders = true;
+ }
+ } else {
+ finishedHeaders = true;
+ }
+ break;
+ }
+ //console.warn('stripHeaders done, finishedHeaders=%s', finishedHeaders)
+ return s;
+ }
+
+ function emitChunks(block, emitter) {
+ //console.warn('emitChunks start: block="%s"', block)
+ /* JSSTYLED */
+ var splitter = /(})(\s*\n\s*)?({\s*")/;
+ var leftTrimmedBlock = block.trimLeft();
+ if (leftTrimmedBlock && leftTrimmedBlock[0] !== '{') {
+ // Currently only support streaming consecutive *objects*.
+ streaming = false;
+ chunks.push(block);
+ return '';
+ }
+ /**
+ * Example:
+ * > '{"a":"b"}\n{"a":"b"}\n{"a":"b"}'.split(/(})(\s*\n\s*)?({\s*")/)
+ * [ '{"a":"b"',
+ * '}',
+ * '\n',
+ * '{"',
+ * 'a":"b"',
+ * '}',
+ * '\n',
+ * '{"',
+ * 'a":"b"}' ]
+ */
+ var bits = block.split(splitter);
+ //console.warn('emitChunks: bits (length %d): %j', bits.length, bits);
+ if (bits.length === 1) {
+ /*
+ * An unwanted side-effect of using a regex to find
+ * newline-separated objects *with a regex*, is that we are looking
+ * for the end of one object leading into the start of a another.
+ * That means that we can end up buffering a complete object until
+ * a subsequent one comes in. If the input stream has large delays
+ * between objects, then this is unwanted buffering.
+ *
+ * One solution would be full stream parsing of objects a la
+ * <https://github.com/creationix/jsonparse>. This would nicely
+ * also remove the artibrary requirement that the input stream be
+ * newline separated. jsonparse apparently has some issues tho, so
+ * I don't want to use it right now. It also isn't *small* so not
+ * sure I want to inline it (`json` doesn't have external deps).
+ *
+ * An alternative: The block we have so far one of:
+ * 1. some JSON that we don't support grouping (e.g. a stream of
+ * non-objects),
+ * 2. a JSON object fragment, or
+ * 3. a complete JSON object (with a possible trailing '{')
+ *
+ * If #3, then we can just emit this as a chunk right now.
+ *
+ * TODO(PERF): Try out avoiding the first more complete regex split
+ * for a presumed common case of single-line newline-separated JSON
+ * objects (e.g. a bunyan log).
+ */
+ // An object must end with '}'. This is an early out to avoid
+ // `JSON.parse` which I'm *presuming* is slower.
+ var trimmed = block.split(/\s*\r?\n/)[0];
+ if (trimmed[trimmed.length - 1] === '}') {
+ var obj;
+ try {
+ obj = JSON.parse(block);
+ } catch (e) {
+ /* pass through */
+ }
+ if (obj !== undefined) {
+ // Emit the parsed `obj` to avoid re-parsing it later.
+ emitter.emit('chunk', block, obj);
+ block = '';
+ }
+ }
+ return block;
+ } else {
+ var n = bits.length - 2;
+ var s;
+ s = bits[0] + bits[1];
+ emitter.emit('chunk', s, JSON.parse(s));
+ for (var i = 3; i < n; i += 4) {
+ s = bits[i] + bits[i + 1] + bits[i + 2];
+ emitter.emit('chunk', s, JSON.parse(s));
+ }
+ return bits[n] + bits[n + 1];
+ }
+ }
+
+ function addDataListener(stream) {
+ stream.on('data', function (chunk) {
+ var s = leftover + chunk;
+ if (!finishedHeaders) {
+ s = stripHeaders(s);
+ }
+ if (!finishedHeaders) {
+ leftover = s;
+ } else {
+ if (!streaming) {
+ chunks.push(chunk);
+ return;
+ }
+ leftover = emitChunks(s, emitter);
+ }
+ });
+ }
+
+ if (opts.inputFiles.length > 0) {
+ // Stream each file in order.
+ var i = 0;
+
+ function addErrorListener(file) {
+ file.on('error', function (err) {
+ emitter.emit(
+ 'error',
+ format('could not read "%s": %s', opts.inputFiles[i], e)
+ );
+ });
+ }
+
+ function addEndListener(file) {
+ file.on('end', function () {
+ if (i < opts.inputFiles.length) {
+ var next = opts.inputFiles[i++];
+ var nextFile = fs.createReadStream(next,
+ {encoding: 'utf8'});
+ addErrorListener(nextFile);
+ addEndListener(nextFile);
+ addDataListener(nextFile);
+ } else {
+ if (!streaming) {
+ emitter.emit('chunk', chunks.join(''));
+ } else if (leftover) {
+ leftover = emitChunks(leftover, emitter);
+ emitter.emit('chunk', leftover);
+ }
+ emitter.emit('end');
+ }
+ });
+ }
+ var first = fs.createReadStream(opts.inputFiles[i++],
+ {encoding: 'utf8'});
+ addErrorListener(first);
+ addEndListener(first);
+ addDataListener(first);
+ } else {
+ // Streaming from stdin.
+ var stdin = process.openStdin();
+ stdin.setEncoding('utf8');
+ addDataListener(stdin);
+ stdin.on('end', function () {
+ if (!streaming) {
+ emitter.emit('chunk', chunks.join(''));
+ } else if (leftover) {
+ leftover = emitChunks(leftover, emitter);
+ emitter.emit('chunk', leftover);
+ }
+ emitter.emit('end');
+ });
+ }
+ return emitter;
+}
+
+/**
+ * Get input from either given file paths or stdin. If `opts.inPlace` then
+ * this calls the callback once for each `opts.inputFiles`.
+ *
+ * @param opts {Object} Parsed options.
+ * @param callback {Function} `function (err, content, filename)` where err
+ * is an error string if there was a problem, `content` is the read
+ * content and `filename` is the associated file name from which content
+ * was loaded if applicable.
+ */
+function getInput(opts, callback) {
+ if (opts.inputFiles.length === 0) {
+ // Read from stdin.
+ var chunks = [];
+
+ var stdin = process.openStdin();
+ stdin.setEncoding('utf8');
+ stdin.on('data', function (chunk) {
+ chunks.push(chunk);
+ });
+
+ stdin.on('end', function () {
+ callback(null, chunks.join(''));
+ });
+ } else if (opts.inPlace) {
+ for (var i = 0; i < opts.inputFiles.length; i++) {
+ var file = opts.inputFiles[i];
+ var content;
+ try {
+ content = fs.readFileSync(file, 'utf8');
+ } catch (e) {
+ callback(e, null, file);
+ }
+ if (content) {
+ callback(null, content, file);
+ }
+ }
+ } else {
+ // Read input files.
+ var i = 0;
+ var chunks = [];
+ try {
+ for (; i < opts.inputFiles.length; i++) {
+ chunks.push(fs.readFileSync(opts.inputFiles[i], 'utf8'));
+ }
+ } catch (e) {
+ return callback(
+ format('could not read "%s": %s', opts.inputFiles[i], e));
+ }
+ callback(null, chunks.join(''),
+ (opts.inputFiles.length === 1 ? opts.inputFiles[0] : undefined));
+ }
+}
+
+
+function isInteger(s) {
+ return (s.search(/^-?[0-9]+$/) == 0);
+}
+
+
+/**
+ * Parse a lookup string into a list of lookup bits. E.g.:
+ *
+ * 'a.b.c' -> ["a","b","c"]
+ * 'b["a"]' -> ["b","a"]
+ * 'b["a" + "c"]' -> ["b","ac"]
+ *
+ * Optionally receives an alternative lookup delimiter (other than '.')
+ */
+function parseLookup(lookup, lookupDelim) {
+ var debug = function () {};
+ //var debug = console.warn;
+
+ var bits = [];
+ debug('\n*** ' + lookup + ' ***');
+
+ bits = [];
+ lookupDelim = lookupDelim || '.';
+ var bit = '';
+ var states = [null];
+ var escaped = false;
+ var ch = null;
+ for (var i = 0; i < lookup.length; ++i) {
+ var escaped = (!escaped && ch === '\\');
+ var ch = lookup[i];
+ debug('-- i=' + i + ', ch=' + JSON.stringify(ch) + ' escaped=' +
+ JSON.stringify(escaped));
+ debug('states: ' + JSON.stringify(states));
+
+ if (escaped) {
+ bit += ch;
+ continue;
+ }
+
+ switch (states[states.length - 1]) {
+ case null:
+ switch (ch) {
+ case '"':
+ case '\'':
+ states.push(ch);
+ bit += ch;
+ break;
+ case '[':
+ states.push(ch);
+ if (bit !== '') {
+ bits.push(bit);
+ bit = ''
+ }
+ bit += ch;
+ break;
+ case lookupDelim:
+ if (bit !== '') {
+ bits.push(bit);
+ bit = ''
+ }
+ break;
+ default:
+ bit += ch;
+ break;
+ }
+ break;
+
+ case '[':
+ bit += ch;
+ switch (ch) {
+ case '"':
+ case '\'':
+ case '[':
+ states.push(ch);
+ break;
+ case ']':
+ states.pop();
+ if (states[states.length - 1] === null) {
+ var evaled = vm.runInNewContext(
+ '(' + bit.slice(1, -1) + ')', {}, '<lookup>');
+ bits.push(evaled);
+ bit = ''
+ }
+ break;
+ }
+ break;
+
+ case '"':
+ bit += ch;
+ switch (ch) {
+ case '"':
+ states.pop();
+ if (states[states.length - 1] === null) {
+ bits.push(bit);
+ bit = ''
+ }
+ break;
+ }
+ break;
+
+ case '\'':
+ bit += ch;
+ switch (ch) {
+ case '\'':
+ states.pop();
+ if (states[states.length - 1] === null) {
+ bits.push(bit);
+ bit = ''
+ }
+ break;
+ }
+ break;
+ }
+ debug('bit: ' + JSON.stringify(bit));
+ debug('bits: ' + JSON.stringify(bits));
+ }
+
+ if (bit !== '') {
+ bits.push(bit);
+ bit = ''
+ }
+
+ // Negative-intify: strings that are negative ints we change to a Number for
+ // special handling in `lookupDatum`: Python-style negative array indexing.
+ var negIntPat = /^-\d+$/;
+ for (var i = 0; i < bits.length; i++) {
+ if (negIntPat.test(bits[i])) {
+ bits[i] = Number(bits[i]);
+ }
+ }
+
+ debug(JSON.stringify(lookup) + ' -> ' + JSON.stringify(bits));
+ return bits
+}
+
+
+/**
+ * Parse the given stdin input into:
+ * {
+ * 'error': ... error object if there was an error ...,
+ * 'datum': ... parsed object if content was JSON ...
+ * }
+ *
+ * @param buffer {String} The text to parse as JSON.
+ * @param obj {Object} Optional. Set when in streaming mode to avoid
+ * re-interpretation of `group`. Also avoids reparsing.
+ * @param group {Boolean} Default false. If true, then non-JSON input
+ * will be attempted to be 'arrayified' (see inline comment).
+ * @param merge {Boolean} Default null. Can be 'shallow' or 'deep'. An
+ * attempt will be made to interpret the input as adjacent objects to
+ * be merged, last key wins. See inline comment for limitations.
+ */
+function parseInput(buffer, obj, group, merge) {
+ if (obj) {
+ return {
+ datum: obj
+ };
+ } else if (group) {
+ /**
+ * Special case: Grouping (previously called auto-arrayification)
+ * of unjoined list of objects:
+ * {"one": 1}{"two": 2}
+ * and auto-concatenation of unjoined list of arrays:
+ * ["a", "b"]["c", "d"]
+ *
+ * This can be nice to process a stream of JSON objects generated from
+ * multiple calls to another tool or `cat *.json | json`.
+ *
+ * Rules:
+ * - Only JS objects and arrays. Don't see strong need for basic
+ * JS types right now and this limitation simplifies.
+ * - The break between JS objects has to include a newline:
+ * {"one": 1}
+ * {"two": 2}
+ * or no spaces at all:
+ * {"one": 1}{"two": 2}
+ * I.e., not this:
+ * {"one": 1} {"two": 2}
+ * This condition should be fine for typical use cases and ensures
+ * no false matches inside JS strings.
+ * - The break between JS *arrays* has to include a newline:
+ * ["one", "two"]
+ * ["three"]
+ * The 'no spaces' case is NOT supported for JS arrays as of v6.0.0
+ * because <https://github.com/trentm/json/issues/55> shows that that
+ * is not safe.
+ */
+ var newBuffer = buffer;
+ /* JSSTYLED */
+ [/(})\s*\n\s*({)/g, /(})({")/g].forEach(function (pat) {
+ newBuffer = newBuffer.replace(pat, '$1,\n$2');
+ });
+ [/(\])\s*\n\s*(\[)/g].forEach(function (pat) {
+ newBuffer = newBuffer.replace(pat, ',\n');
+ });
+ newBuffer = newBuffer.trim();
+ if (newBuffer[0] !== '[') {
+ newBuffer = '[\n' + newBuffer;
+ }
+ if (newBuffer.slice(-1) !== ']') {
+ newBuffer = newBuffer + '\n]\n';
+ }
+ try {
+ return {
+ datum: JSON.parse(newBuffer)
+ };
+ } catch (e2) {
+ return {
+ error: e2
+ };
+ }
+ } else if (merge) {
+ // See the 'Rules' above for limitations on boundaries for 'adjacent'
+ // objects: KISS.
+ var newBuffer = buffer;
+ /* JSSTYLED */
+ [/(})\s*\n\s*({)/g, /(})({")/g].forEach(function (pat) {
+ newBuffer = newBuffer.replace(pat, '$1,\n$2');
+ });
+ newBuffer = '[\n' + newBuffer + '\n]\n';
+ var objs;
+ try {
+ objs = JSON.parse(newBuffer);
+ } catch (e) {
+ return {
+ error: e
+ };
+ }
+ var merged = objs[0];
+ if (merge === 'shallow') {
+ for (var i = 1; i < objs.length; i++) {
+ var obj = objs[i];
+ Object.keys(obj).forEach(function (k) {
+ merged[k] = obj[k];
+ });
+ }
+ } else if (merge === 'deep') {
+ function deepExtend(a, b) {
+ Object.keys(b).forEach(function (k) {
+ if (a[k] && b[k] &&
+ toString.call(a[k]) === '[object Object]' &&
+ toString.call(b[k]) === '[object Object]')
+ {
+ deepExtend(a[k], b[k])
+ } else {
+ a[k] = b[k];
+ }
+ });
+ }
+ for (var i = 1; i < objs.length; i++) {
+ deepExtend(merged, objs[i]);
+ }
+ } else {
+ throw new Error(format('unknown value for "merge": "%s"', merge));
+ }
+ return {
+ datum: merged
+ };
+ } else {
+ try {
+ return {
+ datum: JSON.parse(buffer)
+ };
+ } catch (e) {
+ return {
+ error: e
+ };
+ }
+ }
+}
+
+
+/**
+ * Apply a lookup to the given datum.
+ *
+ * @argument datum {Object}
+ * @argument lookup {Array} The parsed lookup (from
+ * `parseLookup(<string>, <string>)`). Might be empty.
+ * @returns {Object} The result of the lookup.
+ */
+function lookupDatum(datum, lookup) {
+ var d = datum;
+ for (var i = 0; i < lookup.length; i++) {
+ var bit = lookup[i];
+ if (typeof (bit) === 'number' && bit < 0) {
+ d = d[d.length + bit];
+ } else {
+ d = d[bit];
+ }
+ if (d === undefined) {
+ return undefined;
+ }
+ }
+ return d;
+}
+
+
+/**
+ * Output the given datasets.
+ *
+ * @param datasets {Array} Array of data sets to print, in the form:
+ * `[ [<datum>, <sep>, <alwaysPrintSep>], ... ]`
+ * @param filename {String} The filename to which to write the output. If
+ * not set, then emit to stdout.
+ * @param headers {String} The HTTP header block string, if any, to emit
+ * first.
+ * @param opts {Object} Parsed tool options.
+ */
+function printDatasets(datasets, filename, headers, opts) {
+ var isTTY = (filename ? false : process.stdout.isTTY)
+ var write = emit;
+ if (filename) {
+ var tmpPath = path.resolve(path.dirname(filename),
+ format('.%s-json-%s-%s.tmp', path.basename(filename), process.pid,
+ Date.now()));
+ var stats = fs.statSync(filename);
+ var f = fs.createWriteStream(tmpPath,
+ {encoding: 'utf8', mode: stats.mode});
+ write = f.write.bind(f);
+ }
+ if (headers && headers.length > 0) {
+ write(headers)
+ }
+ for (var i = 0; i < datasets.length; i++) {
+ var dataset = datasets[i];
+ var output = stringifyDatum(dataset[0], opts, isTTY);
+ var sep = dataset[1];
+ if (output && output.length) {
+ write(output);
+ write(sep);
+ } else if (dataset[2]) {
+ write(sep);
+ }
+ }
+ if (filename) {
+ f.end();
+ fs.renameSync(tmpPath, filename);
+ if (!opts.quiet) {
+ warn('json: updated "%s" in-place', filename);
+ }
+ }
+}
+
+
+/**
+ * Stringify the given datum according to the given output options.
+ */
+function stringifyDatum(datum, opts, isTTY) {
+ var output = null;
+ switch (opts.outputMode) {
+ case OM_INSPECT:
+ output = util.inspect(datum, false, Infinity, isTTY);
+ break;
+ case OM_JSON:
+ if (typeof (datum) !== 'undefined') {
+ output = JSON.stringify(datum, null, opts.jsonIndent);
+ }
+ break;
+ case OM_COMPACT:
+ // Dev Note: A still relatively experimental attempt at a more
+ // compact ouput somewhat a la Python's repr of a dict. I.e. try to
+ // fit elements on one line as much as reasonable.
+ if (datum === undefined) {
+ // pass
+ } else if (Array.isArray(datum)) {
+ var bits = ['[\n'];
+ datum.forEach(function (d) {
+ bits.push(' ')
+ bits.push(JSON.stringify(d, null, 0).replace(
+ /* JSSTYLED */
+ /,"(?![,:])/g, ', "'));
+ bits.push(',\n');
+ });
+ bits.push(bits.pop().slice(0, -2) + '\n') // drop last comma
+ bits.push(']');
+ output = bits.join('');
+ } else {
+ output = JSON.stringify(datum, null, 0);
+ }
+ break;
+ case OM_JSONY:
+ if (typeof (datum) === 'string') {
+ output = datum;
+ } else if (typeof (datum) !== 'undefined') {
+ output = JSON.stringify(datum, null, opts.jsonIndent);
+ }
+ break;
+ default:
+ throw new Error('unknown output mode: ' + opts.outputMode);
+ }
+ return output;
+}
+
+
+/**
+ * Print out a single result, considering input options.
+ *
+ * @deprecated
+ */
+function printDatum(datum, opts, sep, alwaysPrintSep) {
+ var output = stringifyDatum(datum, opts);
+ if (output && output.length) {
+ emit(output);
+ emit(sep);
+ } else if (alwaysPrintSep) {
+ emit(sep);
+ }
+}
+
+
+var stdoutFlushed = true;
+function emit(s) {
+ // TODO:PERF If this is try/catch is too slow (too granular): move up to
+ // mainline and be sure to only catch this particular error.
+ if (drainingStdout) {
+ return;
+ }
+ try {
+ stdoutFlushed = process.stdout.write(s);
+ } catch (e) {
+ // Handle any exceptions in stdout writing in the 'error' event above.
+ }
+}
+
+process.stdout.on('error', function (err) {
+ if (err.code === 'EPIPE') {
+ // See <https://github.com/trentm/json/issues/9>.
+ drainStdoutAndExit(0);
+ } else {
+ warn(err)
+ drainStdoutAndExit(1);
+ }
+});
+
+
+/**
+ * A hacked up version of 'process.exit' that will first drain stdout
+ * before exiting. *WARNING: This doesn't stop event processing.* IOW,
+ * callers have to be careful that code following this call isn't
+ * accidentally executed.
+ *
+ * In node v0.6 "process.stdout and process.stderr are blocking when they
+ * refer to regular files or TTY file descriptors." However, this hack might
+ * still be necessary in a shell pipeline.
+ */
+var drainingStdout = false;
+function drainStdoutAndExit(code) {
+ if (drainingStdout) {
+ return;
+ }
+ drainingStdout = true;
+ process.stdout.on('drain', function () {
+ process.exit(code);
+ });
+ process.stdout.on('close', function () {
+ process.exit(code);
+ });
+ if (stdoutFlushed) {
+ process.exit(code);
+ }
+}
+
+
+/**
+ * Return a function for the given JS code that returns.
+ *
+ * If no 'return' in the given javascript snippet, then assume we are a single
+ * statement and wrap in 'return (...)'. This is for convenience for short
+ * '-c ...' snippets.
+ */
+function funcWithReturnFromSnippet(js) {
+ // auto-"return"
+ if (js.indexOf('return') === -1) {
+ if (js.substring(js.length - 1) === ';') {
+ js = js.substring(0, js.length - 1);
+ }
+ js = 'return (' + js + ')';
+ }
+ return (new Function(js));
+}
+
+
+
+//---- mainline
+
+function main(argv) {
+ var opts;
+ try {
+ opts = parseArgv(argv);
+ } catch (e) {
+ warn('json: error: %s', e.message)
+ return drainStdoutAndExit(1);
+ }
+ //warn(opts);
+ if (opts.help) {
+ printHelp();
+ return;
+ }
+ if (opts.version) {
+ if (opts.outputMode === OM_JSON) {
+ var v = {
+ version: getVersion(),
+ author: 'Trent Mick',
+ project: 'https://github.com/trentm/json'
+ };
+ console.log(JSON.stringify(v, null, opts.jsonIndent));
+ } else {
+ console.log('json ' + getVersion());
+ console.log('written by Trent Mick');
+ console.log('https://github.com/trentm/json');
+ }
+ return;
+ }
+ var lookupStrs = opts.args;
+
+ // Prepare condition and execution funcs (and vm scripts) for -c/-e.
+ var execVm = Boolean(process.env.JSON_EXEC &&
+ process.env.JSON_EXEC === 'vm');
+ var i;
+ var condFuncs = [];
+ if (!execVm) {
+ for (i = 0; i < opts.condSnippets.length; i++) {
+ condFuncs[i] = funcWithReturnFromSnippet(opts.condSnippets[i]);
+ }
+ }
+ var condScripts = [];
+ if (execVm) {
+ for (i = 0; i < opts.condSnippets.length; i++) {
+ condScripts[i] = vm.createScript(opts.condSnippets[i]);
+ }
+ }
+ var cond = Boolean(condFuncs.length + condScripts.length);
+ var exeFuncs = [];
+ if (!execVm) {
+ for (i = 0; i < opts.exeSnippets.length; i++) {
+ exeFuncs[i] = new Function(opts.exeSnippets[i]);
+ }
+ }
+ var exeScripts = [];
+ if (execVm) {
+ for (i = 0; i < opts.exeSnippets.length; i++) {
+ exeScripts[i] = vm.createScript(opts.exeSnippets[i]);
+ }
+ }
+ var exe = Boolean(exeFuncs.length + exeScripts.length);
+
+ var lookups = lookupStrs.map(function (lookup) {
+ return parseLookup(lookup, opts.lookupDelim);
+ });
+
+ if (opts.group && opts.array && opts.outputMode !== OM_JSON) {
+ // streaming
+ var chunker = chunkEmitter(opts);
+ chunker.on('error', function (error) {
+ warn('json: error: %s', err);
+ return drainStdoutAndExit(1);
+ });
+ chunker.on('chunk', parseChunk);
+ } else if (opts.inPlace) {
+ assert.equal(opts.inputFiles.length, 1,
+ 'cannot handle more than one file with -I');
+ getInput(opts, function (err, content, filename) {
+ if (err) {
+ warn('json: error: %s', err)
+ return drainStdoutAndExit(1);
+ }
+
+ // Take off a leading HTTP header if any and pass it through.
+ var headers = [];
+ while (true) {
+ if (content.slice(0, 5) === 'HTTP/') {
+ var index = content.indexOf('\r\n\r\n');
+ var sepLen = 4;
+ if (index == -1) {
+ index = content.indexOf('\n\n');
+ sepLen = 2;
+ }
+ if (index != -1) {
+ if (!opts.dropHeaders) {
+ headers.push(content.slice(0, index + sepLen));
+ }
+ var is100Continue = (
+ content.slice(0, 21) === 'HTTP/1.1 100 Continue');
+ content = content.slice(index + sepLen);
+ if (is100Continue) {
+ continue;
+ }
+ }
+ }
+ break;
+ }
+ parseChunk(content, undefined, filename, true, headers.join(''));
+ });
+ } else {
+ // not streaming
+ getInput(opts, function (err, buffer, filename) {
+ if (err) {
+ warn('json: error: %s', err)
+ return drainStdoutAndExit(1);
+ }
+ // Take off a leading HTTP header if any and pass it through.
+ while (true) {
+ if (buffer.slice(0, 5) === 'HTTP/') {
+ var index = buffer.indexOf('\r\n\r\n');
+ var sepLen = 4;
+ if (index == -1) {
+ index = buffer.indexOf('\n\n');
+ sepLen = 2;
+ }
+ if (index != -1) {
+ if (!opts.dropHeaders) {
+ emit(buffer.slice(0, index + sepLen));
+ }
+ var is100Continue = (
+ buffer.slice(0, 21) === 'HTTP/1.1 100 Continue');
+ buffer = buffer.slice(index + sepLen);
+ if (is100Continue) {
+ continue;
+ }
+ }
+ }
+ break;
+ }
+ parseChunk(buffer, null, filename, false);
+ });
+ }
+
+ /**
+ * Parse a single chunk of JSON. This may be called more than once
+ * (when streaming or when operating on multiple files).
+ *
+ * @param chunk {String} The JSON-encoded string.
+ * @param obj {Object} Optional. For some code paths while streaming `obj`
+ * will be provided. This is an already parsed JSON object.
+ * @param filename {String} Optional. The filename from which this content
+ * came, if relevant.
+ * @param inPlace {Boolean} Optional. If true, then output will be written
+ * to `filename`.
+ * @param headers {String} Optional. Leading HTTP headers, if any to emit.
+ */
+ function parseChunk(chunk, obj, filename, inPlace, headers) {
+ // Expect the chunk to be JSON.
+ if (!chunk.length) {
+ return;
+ }
+ // parseInput() -> {datum: <input object>, error: <error object>}
+ var input = parseInput(chunk, obj, opts.group, opts.merge);
+ if (input.error) {
+ // Doesn't look like JSON. Just print it out and move on.
+ if (!opts.quiet) {
+ // Use JSON-js' "json_parse" parser to get more detail on the
+ // syntax error.
+ var details = '';
+ var normBuffer = chunk.replace(/\r\n|\n|\r/, '\n');
+ try {
+ json_parse(normBuffer);
+ details = input.error;
+ } catch (err) {
+ // err.at has the position. Get line/column from that.
+ var at = err.at - 1; // `err.at` looks to be 1-based.
+ var lines = chunk.split('\n');
+ var line, col, pos = 0;
+ for (line = 0; line < lines.length; line++) {
+ pos += lines[line].length + 1;
+ if (pos > at) {
+ col = at - (pos - lines[line].length - 1);
+ break;
+ }
+ }
+ var spaces = '';
+ for (var i = 0; i < col; i++) {
+ spaces += '.';
+ }
+ details = err.message + ' at line ' + (line + 1) +
+ ', column ' + (col + 1) + ':\n ' +
+ lines[line] + '\n ' + spaces + '^';
+ }
+ warn('json: error: %s is not JSON: %s',
+ filename ? '"' + filename + '"' : 'input', details);
+ }
+ if (!opts.validate) {
+ emit(chunk);
+ if (chunk.length && chunk[chunk.length - 1] !== '\n') {
+ emit('\n');
+ }
+ }
+ return drainStdoutAndExit(1);
+ }
+ if (opts.validate) {
+ return drainStdoutAndExit(0);
+ }
+ var data = input.datum;
+
+ // Process: items (-M, --items)
+ if (opts.items) {
+ if (!Array.isArray(data)) {
+ var key;
+ var array = [];
+ for (key in data) {
+ if (data.hasOwnProperty(key)) {
+ array.push({
+ key: key,
+ value: data[key]
+ });
+ }
+ }
+ data = array;
+ }
+ }
+
+ // Process: executions (-e, -E)
+ var i, j;
+ if (!exe) {
+ /* pass */
+ } else if (opts.array || (opts.array === null && Array.isArray(data))) {
+ var arrayified = false;
+ if (!Array.isArray(data)) {
+ arrayified = true;
+ data = [data];
+ }
+ for (i = 0; i < data.length; i++) {
+ var datum = data[i];
+ for (j = 0; j < exeFuncs.length; j++) {
+ exeFuncs[j].call(datum);
+ }
+ for (j = 0; j < exeScripts.length; j++) {
+ exeScripts[j].runInNewContext(datum);
+ }
+ }
+ if (arrayified) {
+ data = data[0];
+ }
+ } else {
+ for (j = 0; j < exeFuncs.length; j++) {
+ exeFuncs[j].call(data);
+ }
+ for (j = 0; j < exeScripts.length; j++) {
+ exeScripts[j].runInNewContext(data);
+ }
+ }
+
+ // Process: conditionals (-c)
+ if (!cond) {
+ /* pass */
+ } else if (opts.array || (opts.array === null && Array.isArray(data))) {
+ var arrayified = false;
+ if (!Array.isArray(data)) {
+ arrayified = true;
+ data = [data];
+ }
+ var filtered = [];
+ for (i = 0; i < data.length; i++) {
+ var datum = data[i];
+ var datumCopy = objCopy(datum);
+ var keep = true;
+ // TODO(perf): Perhaps drop the 'datumCopy'? "this is a gun"
+ for (j = 0; j < condFuncs.length; j++) {
+ if (!condFuncs[j].call(datumCopy)) {
+ keep = false;
+ break;
+ }
+ }
+ if (keep) {
+ for (j = 0; j < condScripts.length; j++) {
+ if (!condScripts[j].runInNewContext(datumCopy)) {
+ keep = false;
+ break;
+ }
+ }
+ if (keep) {
+ filtered.push(datum);
+ }
+ }
+ }
+ if (arrayified) {
+ data = (filtered.length ? filtered[0] : []);
+ } else {
+ data = filtered;
+ }
+ } else {
+ var keep = true;
+ var dataCopy = objCopy(data);
+ for (j = 0; j < condFuncs.length; j++) {
+ // TODO(perf): Perhaps drop the 'dataCopy'? "this is a gun"
+ if (!condFuncs[j].call(dataCopy)) {
+ keep = false;
+ break;
+ }
+ }
+ if (keep) {
+ for (j = 0; j < condScripts.length; j++) {
+ if (!condScripts[j].runInNewContext(dataCopy)) {
+ keep = false;
+ break;
+ }
+ }
+ }
+ if (!keep) {
+ data = undefined;
+ }
+ }
+
+ // Process: lookups
+ var lookupsAreIndeces = false;
+ if (lookups.length) {
+ if (opts.array) {
+ if (!Array.isArray(data)) data = [data];
+ var table = [];
+ for (j = 0; j < data.length; j++) {
+ var datum = data[j];
+ var row = {};
+ for (i = 0; i < lookups.length; i++) {
+ var lookup = lookups[i];
+ var value = lookupDatum(datum, lookup);
+ if (value !== undefined) {
+ row[lookup.join('.')] = value;
+ }
+ }
+ table.push(row);
+ }
+ data = table;
+ } else {
+ // Special case handling: Note if the 'lookups' are indeces into
+ // an array. This may be used below to change the output
+ // representation.
+ if (Array.isArray(data)) {
+ lookupsAreIndeces = true;
+ for (i = 0; i < lookups.length; i++) {
+ if (lookups[i].length !== 1 ||
+ isNaN(Number(lookups[i])))
+ {
+ lookupsAreIndeces = false;
+ break;
+ }
+ }
+ }
+ var row = {};
+ for (i = 0; i < lookups.length; i++) {
+ var lookup = lookups[i];
+ var value = lookupDatum(data, lookup);
+ if (value !== undefined) {
+ row[lookup.join('.')] = value;
+ }
+ }
+ data = row;
+ }
+ }
+
+ // --keys
+ if (opts.outputKeys) {
+ var data = Object.keys(data);
+ }
+
+ // Output
+ var datasets = [];
+ if (opts.outputMode === OM_JSON) {
+ if (lookups.length === 1 && !opts.array) {
+ /**
+ * Special case: For JSON output of a *single* lookup, *don't*
+ * use the full table structure, else there is no way to get
+ * string quoting for a single value:
+ * $ echo '{"a": [], "b": "[]"}' | json -j a
+ * []
+ * $ echo '{"a": [], "b": "[]"}' | json -j b
+ * '[]'
+ * See <https://github.com/trentm/json/issues/35> for why.
+ */
+ data = data[lookups[0].join('.')];
+ } else if (lookupsAreIndeces) {
+ /**
+ * Special case: Lookups that are all indeces into an input
+ * array are more likely to be wanted as an array of selected
+ * items rather than a 'JSON table' thing that we use otherwise.
+ */
+ var flattened = [];
+ for (i = 0; i < lookups.length; i++) {
+ var lookupStr = lookups[i].join('.');
+ if (data.hasOwnProperty(lookupStr)) {
+ flattened.push(data[lookupStr])
+ }
+ }
+ data = flattened;
+ }
+ // If JSON output mode, then always just output full set of data to
+ // ensure valid JSON output.
+ datasets.push([data, '\n', false]);
+ } else if (lookups.length) {
+ if (opts.array) {
+ // Output `data` as a 'table' of lookup results.
+ for (j = 0; j < data.length; j++) {
+ var row = data[j];
+ for (i = 0; i < lookups.length - 1; i++) {
+ datasets.push([row[lookups[i].join('.')],
+ opts.delim, true]);
+ }
+ datasets.push([row[lookups[i].join('.')], '\n', true]);
+ }
+ } else {
+ for (i = 0; i < lookups.length; i++) {
+ datasets.push([data[lookups[i].join('.')], '\n', false]);
+ }
+ }
+ } else if (opts.array) {
+ if (!Array.isArray(data)) data = [data];
+ for (j = 0; j < data.length; j++) {
+ datasets.push([data[j], '\n', false]);
+ }
+ } else {
+ // Output `data` as is.
+ datasets.push([data, '\n', false]);
+ }
+ printDatasets(datasets, inPlace ? filename : undefined, headers, opts);
+ }
+}
+
+if (require.main === module) {
+ // HACK guard for <https://github.com/trentm/json/issues/24>.
+ // We override the `process.stdout.end` guard that core node.js puts in
+ // place. The real fix is that `.end()` shouldn't be called on stdout
+ // in node core. Hopefully node v0.6.9 will fix that. Only guard
+ // for v0.6.0..v0.6.8.
+ var nodeVer = process.versions.node.split('.').map(Number);
+ if ([0, 6, 0] <= nodeVer && nodeVer <= [0, 6, 8]) {
+ var stdout = process.stdout;
+ stdout.end = stdout.destroy = stdout.destroySoon = function () {
+ /* pass */
+ };
+ }
+
+ main(process.argv);
+}