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dynamic_map.go
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dynamic_map.go
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package op
import (
"bytes"
"fmt"
"strconv"
"strings"
"github.com/emicklei/melrose/core"
)
type DynamicMap struct {
Target []core.Sequenceable
IndexDynamics []index2dynamic
}
type index2dynamic struct {
at int // at is one-based
dynamic string
}
func NewDynamicMap(slist []core.Sequenceable, dynamics string) (DynamicMap, error) {
id, err := parseIndex2Dynamics(dynamics)
dm := DynamicMap{Target: slist, IndexDynamics: id}
if err != nil {
return dm, err
}
return dm, nil
}
func (d DynamicMap) S() core.Sequence {
target := [][]core.Note{}
source := Join{Target: d.Target}.S().Notes
for _, entry := range d.IndexDynamics {
if entry.at <= 0 || entry.at > len(source) {
// invalid offset, skip
continue
}
eachGroup := source[entry.at-1] // at is one-based
newGroup := []core.Note{}
for _, eachNote := range eachGroup {
newGroup = append(newGroup, eachNote.WithVelocity(core.ParseVelocity(entry.dynamic)))
}
target = append(target, newGroup)
}
return core.Sequence{Notes: target}
}
func (d DynamicMap) Storex() string {
var b bytes.Buffer
fmt.Fprintf(&b, "dynamicmap('%s'", formatIndex2Dynamics(d.IndexDynamics))
core.AppendStorexList(&b, false, d.Target)
fmt.Fprintf(&b, ")")
return b.String()
}
// "1:++,2:--"
func parseIndex2Dynamics(s string) (list []index2dynamic, err error) {
entries := strings.Split(s, ",")
for _, each := range entries {
kv := strings.Split(strings.TrimSpace(each), ":")
if len(kv) != 2 {
return list, fmt.Errorf("bad pair syntax [%s], expected [<positive int>:<dynamic>]", each)
}
ik, err := strconv.Atoi(kv[0])
if err != nil || ik < 1 { // silent ignore error TODO
return list, fmt.Errorf("bad number syntax [%s], expected [<positive int>:<dynamic>]", each)
}
dynamic := strings.TrimSpace(kv[1])
if core.ParseVelocity(dynamic) == -1 {
return list, fmt.Errorf("bad dynamic syntax [%s], expected [<positive int>:<dynamic>]", each)
}
list = append(list, index2dynamic{at: ik, dynamic: dynamic})
}
return
}
// "1:++,2:--"
func formatIndex2Dynamics(list []index2dynamic) string {
var b bytes.Buffer
for i, each := range list {
if i > 0 {
fmt.Fprintf(&b, ",")
}
fmt.Fprintf(&b, "%d:%s", each.at, each.dynamic)
}
return b.String()
}
// Replaced is part of Replaceable
func (d DynamicMap) Replaced(from, to core.Sequenceable) core.Sequenceable {
if core.IsIdenticalTo(d, from) {
return to
}
return DynamicMap{Target: replacedAll(d.Target, from, to), IndexDynamics: d.IndexDynamics}
}