This is a toy compiler for a simple dialect of BASIC in golang. It's written in Go and it generates (ugly!) Go code. I made this just for fun. The code is pretty short and hopefully easy to read. I hope you enjoy it too.
Example program example/hello.bas
10 PRINT "Hello, world."
20 LET x = (3 * 2) + 3
30 LET x = x + 1
40 IF x == 10 THEN PRINT "Ten!"
45 PRINT x
50 IF x >= 15 THEN GOTO 70
60 GOTO 30
70 ENDExample output
$ ./toybasic <example/hello.bas
$ go run out.go
Hello, world.
Ten!
10
11
12
13
14
15
The lexer uses github.com/blynn/nex. I really like nex's awk-like syntax.
$ go run github.com/blynn/nex lexer.nex
The parser uses goyacc
$ go run golang.org/x/tools/cmd/goyacc -o toybasic.go parser.y
$ go build -o toybasic toybasic.go lexer.nn.go compiler.go