Print all string tokens in the given js file in format: path/to/file.js:line:col: 'value'

print-strings.js

var esprima = require('esprima');
var fs = require('fs');

function die(err) {
    process.stderr.write(err + '\n');
    process.exit(1);
}

function format(filename, obj) {
    return filename + ':' +
        obj.loc.start.line + ':' + obj.loc.start.column + ': ' +
        obj.value;
}

function getStrings(contents) {
    return esprima.parse(contents, {
        loc: true,
        tokens: true
    }).tokens.filter(function (token) {
        return token.type === 'String';
    });
}

function main(filename) {
    fs.readFile(filename, function (err, data) {
        if (err) die(err);
        var strings = getStrings(data);
        strings.forEach(function (s) {
            console.log(format(filename, s));
        });
    });
}

if (process.argv.length > 2) {
    process.argv.slice(2).forEach(main);
} else {
    process.stderr.write('Usage: node print-strings.js [files]\n');
    process.exit(2);
}