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interpreter_test.go
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interpreter_test.go
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package balafon_test
import (
"errors"
"fmt"
"slices"
"testing"
"time"
"github.com/mgnsk/balafon"
"github.com/mgnsk/balafon/internal/constants"
. "github.com/onsi/gomega"
"gitlab.com/gomidi/midi/v2"
"gitlab.com/gomidi/midi/v2/smf"
)
func TestParseError(t *testing.T) {
g := NewWithT(t)
it := balafon.New()
err := it.EvalFile("testdata/parse_error.bal")
g.Expect(err).To(HaveOccurred())
var perr *balafon.ParseError
g.Expect(errors.As(err, &perr)).To(BeTrue())
g.Expect(perr.Error()).To(HavePrefix("testdata/parse_error.bal:1:1: error:"))
}
func TestEvalError(t *testing.T) {
g := NewWithT(t)
it := balafon.New()
err := it.EvalFile("testdata/eval_error.bal")
g.Expect(err).To(HaveOccurred())
var perr *balafon.EvalError
g.Expect(errors.As(err, &perr)).To(BeTrue())
g.Expect(perr.Error()).To(HavePrefix("testdata/eval_error.bal:2:1: error:"))
}
func TestCommands(t *testing.T) {
for _, tc := range []struct {
input string
timesig [2]uint8
messages [][]byte
}{
{
":assign c 60; c",
[2]uint8{4, 4},
[][]byte{
smf.MetaMeter(4, 4),
midi.NoteOn(0, 60, constants.DefaultVelocity),
midi.NoteOff(0, 60),
},
},
{
":tempo 200",
[2]uint8{4, 4},
[][]byte{
// Note: missing MetaMeter since there are no notes.
smf.MetaTempo(200),
},
},
{
":time 1 4",
[2]uint8{1, 4},
[][]byte{
smf.MetaMeter(1, 4),
},
},
{
":velocity 10",
[2]uint8{4, 4},
nil, // Nil bar.
},
{
":channel 10",
[2]uint8{4, 4},
nil, // Nil bar.
},
{
":voice 4",
[2]uint8{4, 4},
nil, // Nil bar.
},
{
":channel 10; :assign c 60; c",
[2]uint8{4, 4},
[][]byte{
smf.MetaMeter(4, 4),
midi.NoteOn(9, 60, constants.DefaultVelocity),
midi.NoteOff(9, 60),
},
},
{
":velocity 30; :assign c 60; c",
[2]uint8{4, 4},
[][]byte{
smf.MetaMeter(4, 4),
midi.NoteOn(0, 60, 30),
midi.NoteOff(0, 60),
},
},
{
":program 0",
[2]uint8{4, 4},
[][]byte{
midi.ProgramChange(0, 0),
},
},
{
":control 1 2",
[2]uint8{4, 4},
[][]byte{
midi.ControlChange(0, 1, 2),
},
},
{
`:assign c 60; :bar bar :time 1 4; c :end; :play bar`,
[2]uint8{1, 4},
[][]byte{
smf.MetaMeter(1, 4),
midi.NoteOn(0, 60, constants.DefaultVelocity),
midi.NoteOff(0, 60),
},
},
{
":start",
[2]uint8{4, 4},
[][]byte{
midi.Start(),
},
},
{
":stop",
[2]uint8{4, 4},
[][]byte{
midi.Stop(),
},
},
} {
t.Run(tc.input, func(t *testing.T) {
g := NewWithT(t)
it := balafon.New()
g.Expect(it.EvalString(tc.input)).To(Succeed())
bars := it.Flush()
switch len(tc.messages) {
case 0:
g.Expect(bars).To(HaveLen(0))
default:
g.Expect(bars).To(HaveLen(1))
g.Expect(bars[0].Cap()).To(Equal(uint32(tc.timesig[0]) * (uint32(constants.TicksPerWhole) / uint32(tc.timesig[1]))))
g.Expect(bars[0].Events).To(HaveLen(len(tc.messages)))
for i, msg := range tc.messages {
g.Expect(bars[0].Events[i].Message).To(BeEquivalentTo(msg))
}
}
})
}
}
func TestUndefinedKey(t *testing.T) {
g := NewWithT(t)
it := balafon.New()
g.Expect(it.EvalString("k")).NotTo(Succeed())
}
func TestNoteAlreadyAssigned(t *testing.T) {
g := NewWithT(t)
it := balafon.New()
g.Expect(it.EvalString(":assign c 60")).To(Succeed())
g.Expect(it.EvalString(":assign c 61")).NotTo(Succeed())
}
func TestSharpFlatNote(t *testing.T) {
t.Run("success cases", func(t *testing.T) {
for _, tc := range []struct {
input string
key uint8
}{
{":assign c 125; c#", 126},
{":assign c 2; c$", 1},
} {
t.Run(tc.input, func(t *testing.T) {
g := NewWithT(t)
it := balafon.New()
g.Expect(it.EvalString(tc.input)).To(Succeed())
bars := it.Flush()
g.Expect(bars).To(HaveLen(1))
_, key, _, ok := FindNote(bars[0])
g.Expect(ok).To(BeTrue())
g.Expect(key).To(Equal(tc.key))
})
}
})
t.Run("error cases", func(t *testing.T) {
for _, tc := range []struct {
input string
}{
{":assign c 127; c#"},
{":assign c 0; c$"},
} {
t.Run(tc.input, func(t *testing.T) {
g := NewWithT(t)
it := balafon.New()
err := it.EvalString(tc.input)
g.Expect(err).To(HaveOccurred())
var perr *balafon.EvalError
g.Expect(errors.As(err, &perr)).To(BeTrue())
g.Expect(perr.Error()).To(ContainSubstring("note key must be in range"))
})
}
})
}
func TestAccentuatedAndGhostNote(t *testing.T) {
for _, tc := range []struct {
input string
velocity uint8
}{
{":velocity 110; :assign c 60; c", 110},
{":velocity 110; :assign c 60; c>", 115},
{":velocity 110; :assign c 60; c>>", 120},
{":velocity 110; :assign c 60; c>>>", 125},
{":velocity 110; :assign c 60; c>>>>", constants.MaxValue},
{":velocity 110; :assign c 60; c^", 120},
{":velocity 110; :assign c 60; c^^", constants.MaxValue},
{":velocity 110; :assign c 60; c^^^", constants.MaxValue},
{":velocity 110; :assign c 60; c^>", 125},
{":velocity 110; :assign c 60; c^>>", constants.MaxValue},
{":velocity 10; :assign c 60; c", 10},
{":velocity 10; :assign c 60; c)", 5},
{":velocity 10; :assign c 60; c))", 0},
} {
t.Run(tc.input, func(t *testing.T) {
g := NewWithT(t)
it := balafon.New()
g.Expect(it.EvalString(tc.input)).To(Succeed())
bars := it.Flush()
g.Expect(bars).To(HaveLen(1))
_, _, velocity, ok := FindNote(bars[0])
g.Expect(ok).To(BeTrue())
g.Expect(velocity).To(Equal(velocity))
})
}
}
func TestStaccatoNote(t *testing.T) {
for _, tc := range []struct {
input string
offAt uint32
}{
{":time 1 4; :assign c 60; c", uint32(constants.TicksPerQuarter)},
{":time 1 4; :assign c 60; c`", uint32(constants.TicksPerQuarter / 2)},
{":time 1 4; :assign c 60; c``", uint32(constants.TicksPerQuarter / 4)},
} {
t.Run(tc.input, func(t *testing.T) {
g := NewWithT(t)
it := balafon.New()
g.Expect(it.EvalString(tc.input)).To(Succeed())
bars := it.Flush()
g.Expect(bars).To(HaveLen(1))
g.Expect(bars[0].Cap()).To(Equal(uint32(1) * (uint32(constants.TicksPerWhole) / uint32(4))))
g.Expect(bars[0].Events[1].Duration).To(Equal(tc.offAt))
g.Expect(bars[0].Events[2].Pos).To(Equal(tc.offAt))
})
}
}
func TestNoteLengths(t *testing.T) {
for _, tc := range []struct {
input string
offAt uint32
}{
{
input: "k", // Quarter note.
offAt: uint32(constants.TicksPerQuarter),
},
{
input: "k.", // Dotted quarter note, x1.5.
offAt: uint32(constants.TicksPerQuarter * 3 / 2),
},
{
input: "k..", // Double dotted quarter note, x1.75.
offAt: uint32(constants.TicksPerQuarter * 7 / 4),
},
{
input: "k...", // Triple dotted quarter note, x1.875.
offAt: uint32(constants.TicksPerQuarter * 15 / 8),
},
{
input: "k/5", // Quintuplet quarter note.
offAt: uint32(constants.TicksPerQuarter * 2 / 5),
},
{
input: "k./3", // Dotted triplet quarter note == quarter note.
offAt: uint32(constants.TicksPerQuarter),
},
} {
t.Run(tc.input, func(t *testing.T) {
g := NewWithT(t)
it := balafon.New()
tempo := 60
g.Expect(it.EvalString(fmt.Sprintf(":tempo %d", tempo))).To(Succeed())
g.Expect(it.EvalString(":time 4 4")).To(Succeed())
g.Expect(it.EvalString(":assign k 36")).To(Succeed())
g.Expect(it.EvalString(tc.input)).To(Succeed())
bars := it.Flush()
g.Expect(bars).To(HaveLen(1))
g.Expect(bars[0].Cap()).To(Equal(uint32(4) * (uint32(constants.TicksPerWhole) / uint32(4))))
events := bars[0].Events
g.Expect(events).To(HaveLen(4))
g.Expect(events[0]).To(HaveField("Message", smf.MetaTempo(float64(tempo))))
g.Expect(events[1]).To(HaveField("Message", smf.MetaMeter(4, 4)))
g.Expect(events[2]).To(SatisfyAll(
HaveField("Pos", uint32(0)),
HaveField("Duration", uint32(tc.offAt)),
))
g.Expect(events[3]).To(SatisfyAll(
HaveField("Pos", uint32(tc.offAt)),
HaveField("Duration", uint32(0)),
))
})
}
}
func TestSilence(t *testing.T) {
t.Run("end of bar", func(t *testing.T) {
g := NewWithT(t)
it := balafon.New()
err := it.EvalString(`
:time 4 4
:assign c 60
c
`)
g.Expect(err).NotTo(HaveOccurred())
bars := it.Flush()
g.Expect(bars).To(HaveLen(1))
g.Expect(bars[0].Cap()).To(Equal(uint32(constants.TicksPerWhole)))
// TODO: fill with rests?
g.Expect(bars[0].String()).To(Equal(`time: 4/4
events:
track: 1 pos: 0 dur: 0 message: MetaTimeSig meter: 4/4
track: 1 pos: 0 dur: 960 note: c message: NoteOn channel: 0 key: 60 velocity: 100
track: 1 pos: 960 dur: 0 message: NoteOff channel: 0 key: 60
`))
})
t.Run("beginning of bar", func(t *testing.T) {
g := NewWithT(t)
it := balafon.New()
err := it.EvalString(`
:time 4 4
:assign c 60
---c
`)
g.Expect(err).NotTo(HaveOccurred())
bars := it.Flush()
g.Expect(bars).To(HaveLen(1))
g.Expect(bars[0].Cap()).To(Equal(uint32(constants.TicksPerWhole)))
g.Expect(bars[0].String()).To(Equal(`time: 4/4
events:
track: 1 pos: 0 dur: 0 message: MetaTimeSig meter: 4/4
track: 1 pos: 0 dur: 960 note: - message: UnknownType
track: 1 pos: 960 dur: 960 note: - message: UnknownType
track: 1 pos: 1920 dur: 960 note: - message: UnknownType
track: 1 pos: 2880 dur: 960 note: c message: NoteOn channel: 0 key: 60 velocity: 100
track: 1 pos: 3840 dur: 0 message: NoteOff channel: 0 key: 60
`))
})
}
func TestTimeSignature(t *testing.T) {
g := NewWithT(t)
it := balafon.New()
err := it.EvalString(`
:assign c 60
:time 3 4
:bar bar
:time 1 4
c
:end
:play bar
/* Expect time signature to be restored to 3 4 in next bar. */
c
`)
g.Expect(err).NotTo(HaveOccurred())
bars := it.Flush()
g.Expect(bars).To(HaveLen(2))
g.Expect(bars[0].Cap()).To(Equal(uint32(1) * (uint32(constants.TicksPerWhole) / uint32(4))))
g.Expect(bars[0].Cap()).To(BeEquivalentTo(constants.TicksPerQuarter))
g.Expect(bars[1].Cap()).To(Equal(uint32(3) * (uint32(constants.TicksPerWhole) / uint32(4))))
g.Expect(bars[1].Cap()).To(BeEquivalentTo(3 * constants.TicksPerQuarter))
}
func TestBarTooLong(t *testing.T) {
g := NewWithT(t)
it := balafon.New()
err := it.EvalString(`
:assign c 60
:tempo 60
/* Default time 4 4. */
ccccc
`)
g.Expect(err).To(HaveOccurred())
}
func TestFlushSkipsTooLongBar(t *testing.T) {
g := NewWithT(t)
it := balafon.New()
g.Expect(it.EvalString(":assign c 60")).To(Succeed())
g.Expect(it.EvalString(":time 4 4")).To(Succeed())
g.Expect(it.EvalString("ccccc")).NotTo(Succeed())
g.Expect(it.EvalString("c")).To(Succeed())
bars := it.Flush()
g.Expect(bars).To(HaveLen(1))
g.Expect(bars[0].String()).To(Equal(`time: 4/4
events:
track: 1 pos: 0 dur: 0 message: MetaTimeSig meter: 4/4
track: 1 pos: 0 dur: 960 note: c message: NoteOn channel: 0 key: 60 velocity: 100
track: 1 pos: 960 dur: 0 message: NoteOff channel: 0 key: 60
`))
}
func TestMultiTrackNotesAreSortedPairs(t *testing.T) {
g := NewWithT(t)
it := balafon.New()
input := `
:channel 1
:assign a 0
:assign b 1
:assign c 2
:assign d 3
:channel 2
:assign a 0
:assign b 1
:assign c 2
:assign d 3
:tempo 60
:time 4 4
:bar test
:channel 1
abcd
:channel 2
abcd
:end
:play test
`
g.Expect(it.EvalString(input)).To(Succeed())
bars := it.Flush()
g.Expect(bars).To(HaveLen(1))
g.Expect(bars[0].Duration(60)).To(Equal(4 * time.Second))
g.Expect(bars[0].Events).To(HaveLen(4 + 16)) // 2 tempo, 2 timesig, 8 note on, 8 note off
pos := make([]uint32, 16)
for i, ev := range bars[0].Events[4:] { // skip meta messages
pos[i] = ev.Pos
}
g.Expect(slices.IsSorted(pos)).To(BeTrue())
for i := 0; i < len(pos)-1; i += 2 {
g.Expect(pos[i]).To(Equal(pos[i+1]))
}
}
func TestPendingGlobalCommands(t *testing.T) {
g := NewWithT(t)
it := balafon.New()
err := it.EvalString(`
:channel 2; :assign d 62
:channel 1; :assign c 60
:tempo 60
:time 1 4
:velocity 50
:program 1
:control 1 1
:bar one
:key Cm
:tempo 120
:time 2 8
:velocity 25
:program 2
:control 1 2
/* on channel 1: */
:voice 1
c
:channel 2
:voice 2
d
:end
:bar two
/* time is 1 4 */
c
:end
:play one
:play two
/*
Channel is 1, voice is 1, velocity 50
but time is 1 4, tempo is 120 and key is Cm.
Only velocity, channel and voice are local to bars.
time, tempo, key, program, control, start, stop
are global commands.
*/
c
`)
g.Expect(err).NotTo(HaveOccurred())
bars := it.Flush()
g.Expect(bars).To(HaveLen(3))
// Note: time 1 4 does not exist here. It is overridden by 2 8.
// time 1 4 is reintroduced in the next bar because
// bar captures the current timesig at the moment of
// :bar evaluation instead of :play evaluation.
g.Expect(bars[0].String()).To(Equal(`time: 2/8
events:
track: 1 pos: 0 dur: 0 message: MetaTempo bpm: 60.00
track: 2 pos: 0 dur: 0 message: MetaTempo bpm: 60.00
track: 1 pos: 0 dur: 0 message: ProgramChange channel: 0 program: 1
track: 1 pos: 0 dur: 0 message: ControlChange channel: 0 controller: 1 value: 1
track: 1 pos: 0 dur: 0 message: MetaKeySig key: CMin
track: 1 pos: 0 dur: 0 message: MetaTempo bpm: 120.00
track: 2 pos: 0 dur: 0 message: MetaTempo bpm: 120.00
track: 1 pos: 0 dur: 0 message: MetaTimeSig meter: 2/8
track: 2 pos: 0 dur: 0 message: MetaTimeSig meter: 2/8
track: 1 pos: 0 dur: 0 message: ProgramChange channel: 0 program: 2
track: 1 pos: 0 dur: 0 message: ControlChange channel: 0 controller: 1 value: 2
track: 1 pos: 0 dur: 0 message: MetaText text: "on channel 1:"
track: 1 pos: 0 dur: 960 voice: 1 note: c message: NoteOn channel: 0 key: 60 velocity: 25
track: 2 pos: 0 dur: 960 voice: 2 note: d message: NoteOn channel: 1 key: 62 velocity: 25
track: 1 pos: 960 dur: 0 message: NoteOff channel: 0 key: 60
track: 2 pos: 960 dur: 0 message: NoteOff channel: 1 key: 62
`))
// Note: time is 1 4 now.
g.Expect(bars[1].String()).To(Equal(`time: 1/4
events:
track: 1 pos: 0 dur: 0 message: MetaTimeSig meter: 1/4
track: 2 pos: 0 dur: 0 message: MetaTimeSig meter: 1/4
track: 1 pos: 0 dur: 0 message: MetaText text: "time is 1 4"
track: 1 pos: 0 dur: 960 note: c message: NoteOn channel: 0 key: 60 velocity: 50
track: 1 pos: 960 dur: 0 message: NoteOff channel: 0 key: 60
`))
g.Expect(bars[2].String()).To(Equal(`time: 1/4
events:
track: 1 pos: 0 dur: 0 message: MetaText text: "Channel is 1, voice is 1, velocity 50\nbut time is 1 4, tempo is 120 and key is Cm.\nOnly velocity, channel and voice are local to bars.\ntime, tempo, key, program, control, start, stop\nare global commands."
track: 1 pos: 0 dur: 0 message: MetaTimeSig meter: 1/4
track: 2 pos: 0 dur: 0 message: MetaTimeSig meter: 1/4
track: 1 pos: 0 dur: 960 note: c message: NoteOn channel: 0 key: 60 velocity: 50
track: 1 pos: 960 dur: 0 message: NoteOff channel: 0 key: 60
`))
}
func TestGlobalCommands(t *testing.T) {
g := NewWithT(t)
it := balafon.New()
err := it.EvalString(`
:channel 1; :assign c 60
:tempo 60
:time 1 4
/* Tempo 60 4th rest == 1s. */
-
:bar two
c
:end
:bar one
:tempo 120
:time 2 8
c
:end
:play one
:play two
c
`)
g.Expect(err).NotTo(HaveOccurred())
bars := it.Flush()
g.Expect(bars).To(HaveLen(4))
g.Expect(bars[0].String()).To(Equal(`time: 1/4
events:
track: 1 pos: 0 dur: 0 message: MetaTempo bpm: 60.00
track: 1 pos: 0 dur: 0 message: MetaTimeSig meter: 1/4
track: 1 pos: 0 dur: 0 message: MetaText text: "Tempo 60 4th rest == 1s."
track: 1 pos: 0 dur: 960 note: - message: UnknownType
`))
g.Expect(bars[1].String()).To(Equal(`time: 2/8
events:
track: 1 pos: 0 dur: 0 message: MetaTempo bpm: 120.00
track: 1 pos: 0 dur: 0 message: MetaTimeSig meter: 2/8
track: 1 pos: 0 dur: 960 note: c message: NoteOn channel: 0 key: 60 velocity: 100
track: 1 pos: 960 dur: 0 message: NoteOff channel: 0 key: 60
`))
g.Expect(bars[2].String()).To(Equal(`time: 1/4
events:
track: 1 pos: 0 dur: 0 message: MetaTimeSig meter: 1/4
track: 1 pos: 0 dur: 960 note: c message: NoteOn channel: 0 key: 60 velocity: 100
track: 1 pos: 960 dur: 0 message: NoteOff channel: 0 key: 60
`))
g.Expect(bars[3].String()).To(Equal(`time: 1/4
events:
track: 1 pos: 0 dur: 0 message: MetaTimeSig meter: 1/4
track: 1 pos: 0 dur: 960 note: c message: NoteOn channel: 0 key: 60 velocity: 100
track: 1 pos: 960 dur: 0 message: NoteOff channel: 0 key: 60
`))
}
func TestLetRing(t *testing.T) {
g := NewWithT(t)
it := balafon.New()
g.Expect(it.EvalString(":assign k 36")).To(Succeed())
g.Expect(it.EvalString("k*")).To(Succeed())
bars := it.Flush()
g.Expect(bars).To(HaveLen(1))
// No note off event.
g.Expect(bars[0].String()).To(Equal(`time: 4/4
events:
track: 1 pos: 0 dur: 0 message: MetaTimeSig meter: 4/4
track: 1 pos: 0 dur: 960 note: k* message: NoteOn channel: 0 key: 36 velocity: 100
`))
}
func TestCommandsForbiddenInBar(t *testing.T) {
for _, input := range []string{
":assign c 60",
`:bar inner :start :end`,
`:play test`,
} {
t.Run(input, func(t *testing.T) {
g := NewGomegaWithT(t)
it := balafon.New()
err := it.EvalString(fmt.Sprintf(`:bar outer %s; :end`, input))
g.Expect(err).To(HaveOccurred())
var perr *balafon.EvalError
g.Expect(errors.As(err, &perr)).To(BeTrue())
g.Expect(perr.Error()).To(HaveSuffix("not allowed in bar"))
})
}
}
func TestVoice(t *testing.T) {
g := NewWithT(t)
it := balafon.New()
g.Expect(it.EvalString(":assign k 36")).To(Succeed())
g.Expect(it.EvalString(":voice 1; k")).To(Succeed())
g.Expect(it.EvalString(":voice 2; k")).To(Succeed())
bars := it.Flush()
g.Expect(bars).To(HaveLen(2))
g.Expect(bars[0].String()).To(Equal(`time: 4/4
events:
track: 1 pos: 0 dur: 0 message: MetaTimeSig meter: 4/4
track: 1 pos: 0 dur: 960 voice: 1 note: k message: NoteOn channel: 0 key: 36 velocity: 100
track: 1 pos: 960 dur: 0 message: NoteOff channel: 0 key: 36
`))
g.Expect(bars[1].String()).To(Equal(`time: 4/4
events:
track: 1 pos: 0 dur: 0 message: MetaTimeSig meter: 4/4
track: 1 pos: 0 dur: 960 voice: 2 note: k message: NoteOn channel: 0 key: 36 velocity: 100
track: 1 pos: 960 dur: 0 message: NoteOff channel: 0 key: 36
`))
}
func TestChannelHumanValue(t *testing.T) {
for _, tc := range []struct {
humanCh uint8
midiCh uint8
}{
{1, 0},
{16, 15},
} {
t.Run(fmt.Sprintf(":channel %d", tc.humanCh), func(t *testing.T) {
g := NewWithT(t)
it := balafon.New()
g.Expect(it.EvalString(fmt.Sprintf(":channel %d", tc.humanCh))).To(Succeed())
g.Expect(it.EvalString(":assign c 60")).To(Succeed())
g.Expect(it.EvalString("c")).To(Succeed())
bars := it.Flush()
g.Expect(bars).To(HaveLen(1))
ch, _, _, ok := FindNote(bars[0])
g.Expect(ok).To(BeTrue())
g.Expect(ch).To(Equal(tc.midiCh))
})
}
}
func TestDefaultChannel(t *testing.T) {
g := NewWithT(t)
it := balafon.New()
g.Expect(it.EvalString(":assign c 60")).To(Succeed())
g.Expect(it.EvalString("c")).To(Succeed())
bars := it.Flush()
g.Expect(bars).To(HaveLen(1))
ch, _, _, ok := FindNote(bars[0])
g.Expect(ok).To(BeTrue())
g.Expect(ch).To(Equal(uint8(0)))
}
func TestMetaEventsOnAllChannels(t *testing.T) {
t.Run("single default channel", func(t *testing.T) {
g := NewWithT(t)
it := balafon.New()
g.Expect(it.EvalString(":assign c 60")).To(Succeed())
g.Expect(it.EvalString(":tempo 100")).To(Succeed())
g.Expect(it.EvalString("c")).To(Succeed())
bars := it.Flush()
g.Expect(bars).To(HaveLen(1))
g.Expect(bars[0].String()).To(Equal(`time: 4/4
events:
track: 1 pos: 0 dur: 0 message: MetaTempo bpm: 100.00
track: 1 pos: 0 dur: 0 message: MetaTimeSig meter: 4/4
track: 1 pos: 0 dur: 960 note: c message: NoteOn channel: 0 key: 60 velocity: 100
track: 1 pos: 960 dur: 0 message: NoteOff channel: 0 key: 60
`))
})
t.Run("default channel", func(t *testing.T) {
g := NewWithT(t)
it := balafon.New()
g.Expect(it.EvalString("/* channel 1 */")).To(Succeed())
g.Expect(it.EvalString(":channel 2")).To(Succeed())
g.Expect(it.EvalString(":assign c 60")).To(Succeed())
g.Expect(it.EvalString("c")).To(Succeed())
bars := it.Flush()
g.Expect(bars).To(HaveLen(1))
g.Expect(bars[0].String()).To(Equal(`time: 4/4
events:
track: 1 pos: 0 dur: 0 message: MetaText text: "channel 1"
track: 2 pos: 0 dur: 0 message: MetaTimeSig meter: 4/4
track: 2 pos: 0 dur: 960 note: c message: NoteOn channel: 1 key: 60 velocity: 100
track: 2 pos: 960 dur: 0 message: NoteOff channel: 1 key: 60
`))
})
t.Run("multiple channels", func(t *testing.T) {
g := NewWithT(t)
it := balafon.New()
g.Expect(it.EvalString(`
:channel 1; :assign c 60
:channel 2; :assign c 60
:tempo 100
:bar one
:channel 1; c
:channel 2; c
:end
:play one
`)).To(Succeed())
bars := it.Flush()
g.Expect(bars).To(HaveLen(1))
g.Expect(bars[0].String()).To(Equal(`time: 4/4
events:
track: 1 pos: 0 dur: 0 message: MetaTempo bpm: 100.00
track: 2 pos: 0 dur: 0 message: MetaTempo bpm: 100.00
track: 1 pos: 0 dur: 0 message: MetaTimeSig meter: 4/4
track: 2 pos: 0 dur: 0 message: MetaTimeSig meter: 4/4
track: 1 pos: 0 dur: 960 note: c message: NoteOn channel: 0 key: 60 velocity: 100
track: 2 pos: 0 dur: 960 note: c message: NoteOn channel: 1 key: 60 velocity: 100
track: 1 pos: 960 dur: 0 message: NoteOff channel: 0 key: 60
track: 2 pos: 960 dur: 0 message: NoteOff channel: 1 key: 60
`))
})
}