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/* |
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=====fsnip====== |
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fsnip is a command line utility to extract and modify json from a file. |
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*/ |
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const fs = require('fs') |
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const jp = require('jsonpath') |
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const stringify = require('json-stringify-pretty-compact') |
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const chalk = require('chalk') |
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export function cli (args) { |
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if (args.length === 3 && args[2] === '--help') { |
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console.info('fsnip is a tool for extracting json snippets from json files.\n\n' + |
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'Usage:\n' + '' + |
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'TODO still \n' + |
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' fsnip FILE [options [arguments]] process the file and output the result to the console\n' + |
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' FILE Specifies the file to process.\n' + |
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' --ellipsify replaces the passed object with ellipses (...)\n' + |
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' but excludes any keys which follow prepended by ~\n' + |
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' eg. fsnip myfile.json --ellipsify $..address ~postcode') |
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} else if (args.length >= 3) { |
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try { |
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var txt = fs.readFileSync(args[2]).toString() |
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} catch (err) { |
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console.error(chalk.redBright("unable to read file '" + args[2] + "'")) |
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} |
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if (typeof txt !== 'undefined') { |
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console.log(fsnipDo(args.slice(3), txt)) |
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} |
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} else { // we couldn't recognise the format on the command line |
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console.error(chalk.redBright('Unrecognised arguments passed to fsnip. See fsnip --help')) |
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} |
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} |
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function fsnipDo (cmdOpts, inputText) { |
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// does the processing of the fsnip command |
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// inputText is the text we want to modify |
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if (cmdOpts === null || cmdOpts.length === 0) { return inputText } // no processing required as no options passed in |
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var src = { // a temporary structure containing the text we are working on its type eg. 'json' (which is set later) |
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text: inputText, |
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type: '', |
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outputOptions: {}, |
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error: [], |
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json: null, |
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plain: null |
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} |
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// now we are going to parse through the options and arguments to extract individual options together with their arguments |
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var cmdOpt = '' // current option from the cmdOptsString list |
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var cmdArgs = [] // array containing any arguments for the cmdOpt |
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for (var i = 0; i < cmdOpts.length; i++) { |
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if (cmdOpts[i].substr(0, 2) === '--') { // this is a new option eg. -jsonEllipsify |
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if (cmdOpt !== '') { runOption(cmdOpt, cmdArgs, src) } // process/run any previous Option we found |
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cmdOpt = cmdOpts[i] // store the new option we have found |
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cmdArgs = [] // reset ready for any new arguments |
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} else { |
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// this must be an argument for the current option |
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if (cmdOpt === '') { // error if we don't currently have an option |
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src.error.push("invalid argument '" + cmdOpts[i] + "' passed without valid option to fsnip") |
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} |
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cmdArgs.push(cmdOpts[i]) |
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} |
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} |
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if (cmdOpt !== '') { runOption(cmdOpt, cmdArgs, src) } // process/run the very last Option we found |
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postProcess(src) |
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if (src.error.length === 0) { |
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return src.text |
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} else { |
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return chalk.redBright(src.error) |
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} |
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} |
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function runOption (option, args, inpObj) { |
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// option is a string eg. '-jsonEllipsify' |
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// arguments is an array of arguments for the option |
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// inpObj is an object containing the text, type and json object we need to modify |
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// this function acts as a marsheller to identify options and process them accordingly |
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let funcs = { |
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'--json': () => { json(inpObj, args) }, |
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'--prettify': () => { jsonPrettify(inpObj, args) }, |
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'--ellipsify': () => { jsonEllipsify(inpObj, args) }, |
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'--snip': () => { jsonSnippet(inpObj, args) }, |
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'--delKeys': () => { jsonDelKeys(inpObj, args) }, |
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'--from': () => { textFrom(inpObj, args, false) }, |
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'--start': () => { textFrom(inpObj, args, true) }, |
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'--to': () => { textTo(inpObj, args, false) }, |
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'--finish': () => { textTo(inpObj, args, true) } |
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} |
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if (funcs[option]) { |
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funcs[option]() |
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} else { |
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inpObj.error.push("invalid option '" + option + "' for fsnip") |
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} |
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} |
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function postProcess (inpObj) { |
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// does any post process tidying up |
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if (inpObj.type === 'json') { |
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// stringify as required |
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let opts = inpObj.outputOptions |
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if (opts.maxLength === 'infinity' && opts.margins === false) { |
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inpObj.text = JSON.stringify(inpObj.json) |
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} else if (opts.maxLength === 0 && opts.margins === false) { |
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inpObj.text = JSON.stringify(inpObj.json, null, opts.indent) |
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} else { |
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inpObj.text = stringify(inpObj.json, opts) |
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} |
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// now replace any placeholders. The placeholders are valid JSON but what we replace them with may not be valid JSON |
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inpObj.text = inpObj.text.replace(/\[\s*"fsnipPlaceholderArrEllipses"\s*\]/g, '[...]') |
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inpObj.text = inpObj.text.replace(/\{\s*"fsnipPlaceholderObj"\s*:\s*"Ellipses"\s*\}/g, '{...}') // do this separately to the one below so that if the object is empty it appears all on one line |
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inpObj.text = inpObj.text.replace(/"fsnipPlaceholderObj"\s*:\s*"Ellipses"/g, '...') |
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inpObj.text = inpObj.text.replace(/"fsnipPlaceholderStrEllipses"/g, '"..."') |
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} else if (inpObj.type === 'plain') { |
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inpObj.text = inpObj.plain.trim() |
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} |
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} |
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export function setInputType (inpObj, newType) { // only exported for testing purposes |
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if (typeof inpObj.type === 'undefined' || inpObj.type === '') { // type has not previously been set |
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inpObj.type = newType |
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if (newType === 'json') { |
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inpObj.json = JSON.parse(inpObj.text) |
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jsonPrettify(inpObj) // sets default output options for json |
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return true |
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} else if (newType === 'plain') { |
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inpObj.plain = inpObj.text |
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return true |
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} else { |
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return false |
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} |
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} else if (inpObj.type !== newType) { // it's already been set to something else so there's a problem |
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if (typeof inpObj.error === 'undefined') { inpObj.error = [] } |
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inpObj.error.push('cannot mix options designed to process different types of file') |
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return false |
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} else { |
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return true |
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} |
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} |
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function buildJsonSearchPath (keyName) { |
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if (keyName.substr(0, 1) === '$') { |
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return keyName |
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} else { |
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return "$..['" + keyName + "']" |
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} |
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} |
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function removeQuotes (str) { |
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// if the passed string has matching encapsulating quotes these are removed |
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if ((str.substr(0, 1) === '\'' && str.substr(-1) === '\'') || |
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(str.substr(0, 1) === '"' && str.substr(-1) === '"')) { |
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return str.substr(1, str.length - 2) |
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} else { |
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return str |
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} |
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} |
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// =================json=============================== |
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function json (inpObj, cmdArgs) { |
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// cmdArgs is an array of arguments |
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// json is an object containing the json object we need to modify |
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setInputType(inpObj, 'json') // all we do is flag our content as being json |
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} |
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// =================jsonPrettify======================= |
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function jsonPrettify (inpObj, cmdArgs) { |
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// cmdArgs is an (optional) array of arguments being indent, maxLength, margins |
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// they are all passed as strings so need to be converted to numbers where appropriate |
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// we use - 0 to convert string numbers to numeric and === against itself to check for NaN |
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if (setInputType(inpObj, 'json')) { |
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let opts = inpObj.outputOptions |
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// set defaults |
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opts.margins = false |
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opts.maxLength = 45 |
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opts.indent = 2 |
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// overwrite with any values passed in |
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if (cmdArgs !== undefined) { |
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if ((cmdArgs[0] - 0) === (cmdArgs[0] - 0)) { opts.indent = (cmdArgs[0] - 0) } |
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if ((cmdArgs[1] - 0) === (cmdArgs[1] - 0)) { opts.maxLength = (cmdArgs[1] - 0) } |
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if (cmdArgs[1] === 'infinity') { opts.maxLength = 'infinity' } |
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opts.margins = (cmdArgs[2] === 'true') // defaults to false if margins anything other than true |
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} |
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} |
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} |
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// =================ellipsify========================== |
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function jsonEllipsify (inpObj, cmdArgs) { |
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// cmdArgs is an array of arguments |
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// json is an object containing the json object we need to modify |
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if (setInputType(inpObj, 'json')) { |
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// we have two types of argument for Ellipsify, plain and exclude so separate them out |
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var cmdArgsPlain = [] |
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var cmdArgsExclude = [] |
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for (let i = 0; i < cmdArgs.length; i++) { |
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if (cmdArgs[i].substr(0, 1) === '~') { |
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cmdArgsExclude.push(removeQuotes(cmdArgs[i].substr(1))) |
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} else { |
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cmdArgsPlain.push(removeQuotes(cmdArgs[i])) |
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} |
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} |
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if (cmdArgsPlain.length === 0) { cmdArgsPlain.push('$') } |
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for (let i = 0; i < cmdArgsPlain.length; i++) { |
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minimizeJsonProperty(inpObj.json, cmdArgsPlain[i], cmdArgsExclude) |
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} |
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} |
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} |
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export function minimizeJsonProperty (json, property, excludes) { // only exported for test purposes |
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// this function takes a json object as input.and for every occurrence of the given property puts a placeholder |
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// but only if it is an array or an object. |
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var arrPlaceholder = ['fsnipPlaceholderArrEllipses'] // a valid json array used as a placeholder to be replaced later with [...] (which is not valid json) |
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var strPlaceholder = 'fsnipPlaceholderStrEllipses' |
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var jsonPaths = jp.paths(json, buildJsonSearchPath(property)) // creates an array of all the paths of instances of the the property we want to minimize |
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for (var i = 0; i < jsonPaths.length; i++) { |
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let jsonPath = jp.stringify(jsonPaths[i]) |
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switch (jp.value(json, jsonPath).constructor.name) { |
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case 'Object': |
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var keys = Object.keys(jp.value(json, jsonPath)) |
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for (var j = 0; j < keys.length; j++) { |
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if (excludes.indexOf(keys[j]) === -1) { |
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// this key is not in the excludes list so we need to delete it |
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delete jp.value(json, jsonPath)[keys[j]] |
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} |
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} |
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jp.value(json, jsonPath)['fsnipPlaceholderObj'] = 'Ellipses' // add a placeholder for the Ellipses |
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break |
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case 'Array': |
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jp.value(json, jsonPath, arrPlaceholder) |
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break |
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case 'String': |
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jp.value(json, jsonPath, strPlaceholder) |
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break |
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default: |
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// do nothing |
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} |
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} |
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} |
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// ===================snip Function============================== |
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function jsonSnippet (inpObj, cmdArgs) { |
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// cmdArgs is an array of arguments |
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// inpObj is an object containing the json object we need to modify |
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// the format of the call is eg. |
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// '--snip vessel 2' which would extract the second instance of "vessel" in the json supplied |
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// with the instance identifier being optional |
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if (setInputType(inpObj, 'json')) { |
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var occ = 1 |
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if (cmdArgs.length === 1) { |
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occ = 1 // by default we snip the first occurrence of this property |
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} else if (cmdArgs.length === 2) { |
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if ((cmdArgs[1] - 0) === (cmdArgs[1] - 0)) { |
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occ = (cmdArgs[1] - 0) |
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if (occ < 1) { |
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inpObj.error.push('--snip requires its second argument to be a numeric values of at least 1 being the instance required') |
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return |
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} |
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} else { |
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inpObj.error.push("--snip requires its second argument to be numeric eg. '--snip vessel 2' with the optional second argument being the instance required") |
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return |
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} |
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} else { |
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inpObj.error.push("--snip requires 1 or 2 arguments eg. '--snip vessel 2' with the optional second argument being the instance required.") |
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return |
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} |
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var jsonPaths = jp.paths(inpObj.json, buildJsonSearchPath(removeQuotes(cmdArgs[0]))) // creates an array of all the paths to this property |
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if (jsonPaths.length < occ) { |
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inpObj.error.push('--snip failed because there were only ' + jsonPaths.length + " occurrences of '" + removeQuotes(cmdArgs[0]) + "' found.") |
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return |
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} |
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inpObj.json = jp.value(inpObj.json, jp.stringify(jsonPaths[occ - 1])) |
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} |
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} |
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// ===================delKeys Function=========================== |
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function jsonDelKeys (inpObj, cmdArgs) { |
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// cmdArgs is an array of arguments |
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// inpObj is an object containing the json object we need to remove keys from |
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// the format of the call is eg. |
|
282
|
|
|
// '-jsonDelKeys vessel gnss' which would delete all instances of "vessel" and "gnss" in the json supplied |
|
283
|
|
|
if (setInputType(inpObj, 'json')) { |
|
284
|
|
|
for (var i = 0; i < cmdArgs.length; i++) { |
|
285
|
|
|
deleteJsonKey(inpObj.json, removeQuotes(cmdArgs[i])) |
|
286
|
|
|
} |
|
287
|
|
|
} |
|
288
|
|
|
} |
|
289
|
|
|
|
|
290
|
|
|
function deleteJsonKey (json, key) { |
|
291
|
|
|
// deletes all occurrences of key within json |
|
292
|
|
|
var jsonPaths = jp.paths(json, buildJsonSearchPath(key)) // creates an array of all the paths of instances of the key we want to delete |
|
293
|
|
|
var parent |
|
294
|
|
|
for (var i = 0; i < jsonPaths.length; i++) { |
|
295
|
|
|
let jsonPath = jp.stringify(jsonPaths[i]) |
|
296
|
|
|
parent = jp.parent(json, jsonPath) |
|
297
|
|
|
if (Array.isArray(parent)) { |
|
298
|
|
|
parent.splice(jsonPaths[i][jsonPaths[i].length - 1], 1) |
|
299
|
|
|
} else { |
|
300
|
|
|
delete parent[jsonPaths[i][jsonPaths[i].length - 1]] |
|
301
|
|
|
} |
|
302
|
|
|
} |
|
303
|
|
|
} |
|
304
|
|
|
|
|
305
|
|
|
// ===================textFrom================================= |
|
306
|
|
|
function textFrom (inpObj, cmdArgs, inclusive) { |
|
307
|
|
|
// cmdArgs is an array of arguments |
|
308
|
|
|
// inpObj is an object containing the text object we need to snip contents from |
|
309
|
|
|
// the format of the call is eg. |
|
310
|
|
|
// '--textFrom "some text" 2 - would start from the second instance of "some text" |
|
311
|
|
|
if (setInputType(inpObj, 'plain')) { |
|
312
|
|
|
let x = findLocation(inpObj, cmdArgs, inclusive ? '--start' : '--from') |
|
313
|
|
|
if (x.found) { |
|
314
|
|
|
inpObj.plain = inpObj.plain.substr(x.loc + (inclusive === true ? 0 : x.len)) |
|
315
|
|
|
} |
|
316
|
|
|
} |
|
317
|
|
|
} |
|
318
|
|
|
|
|
319
|
|
|
// ===================textTo=================================== |
|
320
|
|
|
function textTo (inpObj, cmdArgs, inclusive) { |
|
321
|
|
|
// cmdArgs is an array of arguments |
|
322
|
|
|
// inpObj is an object containing the text object we need to snip contents from |
|
323
|
|
|
// the format of the call is eg. |
|
324
|
|
|
// '--textTo "some text" 2 - would go up to the second instance of "some text" |
|
325
|
|
|
if (setInputType(inpObj, 'plain')) { |
|
326
|
|
|
let x = findLocation(inpObj, cmdArgs, inclusive ? '--finish' : '--to') |
|
327
|
|
|
if (x.found) { |
|
328
|
|
|
inpObj.plain = inpObj.plain.substring(0, x.loc + (inclusive === true ? x.len : 0)) |
|
329
|
|
|
} |
|
330
|
|
|
} |
|
331
|
|
|
} |
|
332
|
|
|
|
|
333
|
|
|
function findLocation (inpObj, cmdArgs, errString) { |
|
334
|
|
|
// find the location of the nth occurrence of the text specified in the command arguments |
|
335
|
|
|
let occ |
|
336
|
|
|
if (cmdArgs.length === 1) { |
|
337
|
|
|
occ = 1 // by default we take from the first occurrence of this text |
|
338
|
|
|
} else if (cmdArgs.length === 2) { |
|
339
|
|
|
if ((cmdArgs[1] - 0) === (cmdArgs[1] - 0)) { |
|
340
|
|
|
occ = (cmdArgs[1] - 0) |
|
341
|
|
|
if (occ < 1) { |
|
342
|
|
|
inpObj.error.push(errString + ' requires its second argument to be a numeric value of at least 1 being the instance required') |
|
343
|
|
|
return {found: false} |
|
344
|
|
|
} |
|
345
|
|
|
} else { |
|
346
|
|
|
inpObj.error.push(errString + " requires its second argument to be numeric eg. '" + errString + " sometext 2' with the optional second argument being the instance required") |
|
347
|
|
|
return {found: false} |
|
348
|
|
|
} |
|
349
|
|
|
} else { |
|
350
|
|
|
inpObj.error.push(errString + " requires 1 or 2 arguments eg. '" + errString + " sometext' with the optional second argument being the instance required.") |
|
351
|
|
|
return {found: false} |
|
352
|
|
|
} |
|
353
|
|
|
let x = -1 |
|
354
|
|
|
let arg = removeQuotes(cmdArgs[0]) |
|
355
|
|
|
for (let i = 0; i < occ; i++) { |
|
356
|
|
|
x = inpObj.plain.indexOf(arg, x + 1) |
|
357
|
|
|
} |
|
358
|
|
|
if (x === -1) { |
|
359
|
|
|
inpObj.error.push('unable to find occurrence ' + occ + ' of "' + arg + '"') |
|
360
|
|
|
} |
|
361
|
|
|
return {found: (x !== -1), loc: x, len: arg.length} |
|
362
|
|
|
} |
|
363
|
|
|
|
bkp7 /
fsnip
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