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cantool/generate: handle mux bool types correctly + skip overflow values #52

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cantool/generate: handle mux bool types correctly + skip overflow values #52

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38 changes: 36 additions & 2 deletions internal/generate/file.go
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@ import (
"fmt"
"go/format"
"go/types"
"log"
"path"
"regexp"
"strings"
Expand Down Expand Up @@ -128,6 +129,15 @@ func slugifyString(s string) string {
return nonAlphaNumericRegexp.ReplaceAllString(s, "")
}

func countBits(v int) int {
out := 0
for v != 0 {
out += 1
v = v >> 1
}
return out
}

func SignalCustomType(f *File, m *descriptor.Message, s *descriptor.Signal) {
f.P("// ", signalType(m, s), " models the ", s.Name, " signal of the ", m.Name, " message.")
f.P("type ", signalType(m, s), " ", signalPrimitiveType(s))
Expand All @@ -136,6 +146,10 @@ func SignalCustomType(f *File, m *descriptor.Message, s *descriptor.Signal) {
f.P("const (")
for _, vd := range s.ValueDescriptions {
desc := slugifyString(vd.Description)
if countBits(vd.Value) > int(s.Length) {
log.Printf("warning: %s = %d overflows len %d", desc, vd.Value, s.Length)
continue
}
switch {
case s.Length == 1 && vd.Value == 1:
f.P(signalType(m, s), "_", desc, " ", signalType(m, s), " = true")
Expand Down Expand Up @@ -163,6 +177,10 @@ func SignalCustomType(f *File, m *descriptor.Message, s *descriptor.Signal) {
} else {
f.P("switch v {")
for _, vd := range s.ValueDescriptions {
if countBits(vd.Value) > int(s.Length) {
log.Printf("warning: %s = %d overflows len %d", vd.Description, vd.Value, s.Length)
continue
}
f.P("case ", vd.Value, ":")
f.P(`return "`, vd.Description, `"`)
}
Expand Down Expand Up @@ -402,7 +420,15 @@ func MarshalFrame(f *File, m *descriptor.Message) {
if !s.IsMultiplexed {
continue
}
f.P("if m.", signalField(mux), " == ", s.MultiplexerValue, " {")
var v interface{} = s.MultiplexerValue
if mux.Length == 1 {
if s.MultiplexerValue == 0 {
v = "false"
} else {
v = "true"
}
}
f.P("if m.", signalField(mux), " == ", v, " {")
f.P(
"md.", s.Name, ".Marshal", signalSuperType(s), "(&f.Data, ", signalPrimitiveSuperType(s),
"(m.", signalField(s), "))",
Expand Down Expand Up @@ -467,7 +493,15 @@ func UnmarshalFrame(f *File, m *descriptor.Message) {
if !s.IsMultiplexed {
continue
}
f.P("if m.", signalField(mux), " == ", s.MultiplexerValue, " {")
var v interface{} = s.MultiplexerValue
if mux.Length == 1 {
if s.MultiplexerValue == 0 {
v = "false"
} else {
v = "true"
}
}
f.P("if m.", signalField(mux), " == ", v, " {")
f.P("m.", signalField(s), " = ", signalType(m, s), "(md.", s.Name, ".Unmarshal", signalSuperType(s), "(f.Data))")
f.P("}")
}
Expand Down