source: trip-planner-front/node_modules/streamroller/lib/fileNameParser.js@ 6fe77af

Last change on this file since 6fe77af was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit

  • Property mode set to 100644
File size: 2.8 KB
Line 
1const debug = require("debug")("streamroller:fileNameParser");
2const FILENAME_SEP = ".";
3const ZIP_EXT = ".gz";
4const format = require("date-format");
5
6module.exports = ({ file, keepFileExt, pattern }) => {
7 // All these functions take two arguments: f, the filename, and p, the result placeholder
8 // They return the filename with any matching parts removed.
9 // The "zip" function, for instance, removes the ".gz" part of the filename (if present)
10 const zip = (f, p) => {
11 if (f.endsWith(ZIP_EXT)) {
12 debug("it is gzipped");
13 p.isCompressed = true;
14 return f.slice(0, -1 * ZIP_EXT.length);
15 }
16 return f;
17 };
18
19 const __NOT_MATCHING__ = "__NOT_MATCHING__";
20
21 const extAtEnd = f => {
22 if (f.startsWith(file.name) && f.endsWith(file.ext)) {
23 debug("it starts and ends with the right things");
24 return f.slice(file.name.length + 1, -1 * file.ext.length);
25 }
26 return __NOT_MATCHING__;
27 };
28
29 const extInMiddle = f => {
30 if (f.startsWith(file.base)) {
31 debug("it starts with the right things");
32 return f.slice(file.base.length + 1);
33 }
34 return __NOT_MATCHING__;
35 };
36
37 const dateAndIndex = (f, p) => {
38 const items = f.split(FILENAME_SEP);
39 let indexStr = items[items.length - 1];
40 debug("items: ", items, ", indexStr: ", indexStr);
41 let dateStr = f;
42 if (indexStr !== undefined && indexStr.match(/^\d+$/)) {
43 dateStr = f.slice(0, -1 * (indexStr.length + 1));
44 debug(`dateStr is ${dateStr}`);
45 if (pattern && !dateStr) {
46 dateStr = indexStr;
47 indexStr = "0";
48 }
49 } else {
50 indexStr = "0";
51 }
52
53 try {
54 // Two arguments for new Date() are intentional. This will set other date
55 // components to minimal values in the current timezone instead of UTC,
56 // as new Date(0) will do.
57 const date = format.parse(pattern, dateStr, new Date(0, 0));
58 if (format.asString(pattern, date) !== dateStr) return f;
59 p.index = parseInt(indexStr, 10);
60 p.date = dateStr;
61 p.timestamp = date.getTime();
62 return "";
63 } catch (e) {
64 //not a valid date, don't panic.
65 debug(`Problem parsing ${dateStr} as ${pattern}, error was: `, e);
66 return f;
67 }
68 };
69
70 const index = (f, p) => {
71 if (f.match(/^\d+$/)) {
72 debug("it has an index");
73 p.index = parseInt(f, 10);
74 return "";
75 }
76 return f;
77 };
78
79 let parts = [
80 zip,
81 keepFileExt ? extAtEnd : extInMiddle,
82 pattern ? dateAndIndex : index
83 ];
84
85 return filename => {
86 let result = { filename, index: 0, isCompressed: false };
87 // pass the filename through each of the file part parsers
88 let whatsLeftOver = parts.reduce(
89 (remains, part) => part(remains, result),
90 filename
91 );
92 // if there's anything left after parsing, then it wasn't a valid filename
93 return whatsLeftOver ? null : result;
94 };
95};
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