We should implement the QBasic "NAME" statement, which changes the name of a disk file or directory.

Its syntax is "NAME oldfilename AS newfilename".

The NAME statement is similar to the DOS RENAME command. NAME can move a file from one directory to another but cannot move a directory.

The arguments oldfilename and newfilename are string expressions each of which contains a file or directory name and an optional path. If the path in newfilename is different from the path in oldfilename, the NAME statement changes the pathname as well as renames the file as indicated.

Examples

NAME "ACCTS" AS "LEDGER"

In principle, resolving this is very similar to implementing the KILL statement in #96. Specifically, the skeleton for declaring a new QBasic statement is the same, but instead of deleting the file (like KILL does), we must rename it.

The relevant files to change are:

• libbababasic/src/main/antlr/io/atha/libbababasic/grammar/BabaBASIC.g4
• libbababasic/src/main/java/io/atha/libbababasic/file/BBFiles.kt
• libbababasic/src/main/java/io/atha/libbababasic/parser/IR.kt
• libbababasic/src/main/java/io/atha/libbababasic/parser/IRListener.kt
• libbababasic/src/main/java/io/atha/libbababasic/runtime/BBRuntime.kt
• libbababasic/src/main/java/io/atha/libbababasic/runtime/Functions.kt