Reduce Go programs
Reduce a program to its simplest form as long as it produces a compiler error or any output (such as a panic) matching a regular expression.
go get -u mvdan.cc/goreduce
Note that this project isn't being actively developed right now. If you are interested in continuing the work, feel free to fork the repository, or email me to discuss transferring the entire repository over.
func main() {
a := []int{1, 2, 3}
if true {
a = append(a, 4)
}
a[1] = -2
println(a[10])
}
goreduce -match 'index out of range' .
func main() {
a := []int{}
println(a[0])
}
For more usage information, see goreduce -h
.
Before | After | |
---|---|---|
statement | a; b |
a or b |
index | a[1] |
a |
slice | a[:2] |
a or a[:] |
binary part | a + b , a && b |
a or b |
unary op | -a , !a |
a |
star | *a |
a |
parentheses | (a) |
a |
if/else | if a { b } else c |
b or c |
defer | defer f() |
f() |
go | go f() |
f() |
basic value | 123, "foo" |
0, "" |
composite value | T{a, b} |
T{} |
Before | After | |
---|---|---|
const | const c = 0; f(c) |
f(0) |
var | v := false; f(v) |
f(false) |
case | case x: a |
a |
block | { a } |
a |
simple call | f() |
{ body } |
Before | After | |
---|---|---|
integer op | 2 * 3 |
6 |
string op | "foo" + "bar" |
"foobar" |
slice | "foo"[1:] |
"oo" |
index | "foo"[0] |
'f' |
builtin | len("foo") |
3 |