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|
package rope
import (
"bytes"
"errors"
"fmt"
"testing"
"github.com/bruth/assert"
)
var (
lhs = leaf("123")
rhs = leaf("456")
tree node
)
var substrings []struct {
orig, want node
start, end int64
}
func init() {
defer disableCoalesce()()
tree = conc(lhs, rhs, 0, 0)
substrings = []struct {
orig, want node
start, end int64
}{
{
orig: tree,
want: tree,
start: 0,
end: tree.length(),
},
{
orig: tree,
want: tree,
start: -100,
end: 100,
},
{
orig: tree,
want: leaf("1"),
start: 0,
end: 1,
},
{
orig: tree,
want: conc(lhs, leaf("4"), 0, 0),
start: 0,
end: 4,
},
{
orig: tree,
want: leaf("1"),
start: -100,
end: 1,
},
{
orig: tree,
want: conc(leaf("3"), rhs, 0, 0),
start: 2,
end: tree.length(),
},
{
orig: tree,
want: rhs,
start: 3,
end: tree.length(),
},
{
orig: tree,
want: leaf(""),
start: 3,
end: 2,
},
{
orig: tree,
want: lhs,
start: 0,
end: 3,
},
{
orig: tree,
want: tree,
start: 0,
end: 100,
},
{
orig: tree,
want: leaf(""),
start: 0,
end: 0,
},
{
orig: tree,
want: leaf(""),
start: -200,
end: -100,
},
{
orig: tree,
want: conc(leaf("23"), leaf("4"), 0, 0),
start: 1,
end: 4,
},
}
}
func TestConcatLength(t *testing.T) {
assert.Equal(t, depthT(1), tree.depth())
assert.Equal(t, int64(6), tree.length())
}
func TestConcatSubstr(t *testing.T) {
defer disableCoalesce()()
for _, ss := range substrings {
got := ss.orig.slice(ss.start, ss.end)
msg := fmt.Sprintf("%q[%v:%v] != %q", Rope{ss.orig}, ss.start, ss.end, Rope{got})
assert.Equal(t, ss.want, got, msg)
}
}
func TestConcatDropPrefix(t *testing.T) {
defer disableCoalesce()()
for _, ss := range substrings {
if ss.end < ss.orig.length() {
// Ignore non-suffix substrings
continue
}
got := ss.orig.dropPrefix(ss.start)
msg := fmt.Sprintf("%q[%v:] != %q", Rope{ss.orig}, ss.start, Rope{got})
assert.Equal(t, ss.want, got, msg)
}
}
func TestConcatDropPostfix(t *testing.T) {
defer disableCoalesce()()
for _, ss := range substrings {
if ss.start > 0 {
// Ignore non-prefix substrings
continue
}
got := ss.orig.dropPostfix(ss.end)
msg := fmt.Sprintf("%q[:%v] != %q", Rope{ss.orig}, ss.end, Rope{got})
assert.Equal(t, ss.want, got, msg)
}
}
func TestConcatWriteTo(t *testing.T) {
buf := bytes.NewBuffer(nil)
_, _ = tree.WriteTo(buf)
assert.Equal(t, string(lhs+rhs), buf.String())
}
func TestConcatWalkLeaves(t *testing.T) {
counter := 0
err := tree.walkLeaves(func(l string) error {
switch counter {
case 0:
assert.Equal(t, string(lhs), l)
case 1:
assert.Equal(t, string(rhs), l)
case 2:
t.Errorf("leaf.walkLeaves: function called too many times")
default:
// Ignore more than two calls, error has already been produced.
}
counter++
return nil
})
assert.Nil(t, err)
counter = 0
err = tree.walkLeaves(func(l string) error {
switch counter {
case 0:
assert.Equal(t, string(lhs), l)
return errors.New("stop now")
case 1:
t.Errorf("leaf.walkLeaves: did not stop after returning true")
default:
// Ignore more than two calls, error has already been produced.
}
counter++
return nil
})
assert.Equal(t, errors.New("stop now"), err)
}
|
