Runtime error for weird mappings using only the prefix/suffix notation

[ericcornelissen]

Bug Report

• wordrow version: v0.4.0-beta

Description

wordrow does not handle mappings that use the prefix/suffix notation in a way that was not intended.

Actual Behaviour

wordrow panics.

Expected Behaviour

wordrow provides an error.

Working Example

1. Create a file specifying the following mapping

# mapping.csv
- -,-

2. Create a non-empty input file

# inputfile.txt

Hello world!

3. Run wordrow using mapping.csv as a --map-file:

$ ./wordrow --map-file ./mapping.csv ./input.txt

Log Output

$ ./wordrow -v -M ./mapping.csv ./inputfile.txt
[Debug] Processing CLI specified map files...
[Debug] Parsing argument './mapping.csv'

[Debug] Reading './mapping.csv'

[Debug] Processing '/media/win/workspace/wordrow/mapping.csv' as a .csv mapping file

[Debug] Processing CLI specified mappings...
[Debug] Processing '/media/win/workspace/wordrow/inputfile.txt' as input file

panic: runtime error: slice bounds out of range [:-1]

goroutine 7 [running]:
github.com/ericcornelissen/wordrow/internal/wordmaps.removePrefixAndSuffixSymbols(0xc0000144ce, 0x1, 0xc00006a598, 0xc000001338)
        /media/win/workspace/wordrow/internal/wordmaps/mapping.go:27 +0x206
github.com/ericcornelissen/wordrow/internal/wordmaps.(*Mapping).GetTo(...)
        /media/win/workspace/wordrow/internal/wordmaps/mapping.go:165
github.com/ericcornelissen/wordrow/internal/wordmaps.(*Mapping).getReplacement(0xc00000c220, 0xc000014520, 0x2, 0xc000014523, 0x3, 0x0, 0x0)
        /media/win/workspace/wordrow/internal/wordmaps/mapping.go:111 +0x3c
github.com/ericcornelissen/wordrow/internal/wordmaps.(*Mapping).Match.func1(0xc000022420, 0xc000014520, 0x10, 0xc00000c220)
        /media/win/workspace/wordrow/internal/wordmaps/mapping.go:178 +0x1ca
created by github.com/ericcornelissen/wordrow/internal/wordmaps.(*Mapping).Match
        /media/win/workspace/wordrow/internal/wordmaps/mapping.go:172 +0x76