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package main
import (
"bytes"
"io"
)
type Var interface {
Value
Append(*Evaluator, string) Var
AppendVar(*Evaluator, Var) Var
Flavor() string
Origin() string
IsDefined() bool
}
type TargetSpecificVar struct {
v Var
op string
}
func (v TargetSpecificVar) Append(ev *Evaluator, s string) Var {
return TargetSpecificVar{
v: v.v.Append(ev, s),
op: v.op,
}
}
func (v TargetSpecificVar) AppendVar(ev *Evaluator, v2 Var) Var {
return TargetSpecificVar{
v: v.v.AppendVar(ev, v2),
op: v.op,
}
}
func (v TargetSpecificVar) Flavor() string {
return v.v.Flavor()
}
func (v TargetSpecificVar) Origin() string {
return v.v.Origin()
}
func (v TargetSpecificVar) IsDefined() bool {
return v.v.IsDefined()
}
func (v TargetSpecificVar) String() string {
// TODO: If we add the info of |op| a test starts
// failing. Shouldn't we use this only for debugging?
return v.v.String()
// return v.v.String() + " (op=" + v.op + ")"
}
func (v TargetSpecificVar) Eval(w io.Writer, ev *Evaluator) {
v.v.Eval(w, ev)
}
type SimpleVar struct {
// TODO(ukai): []byte -> Value (literal or so?)
value []byte
origin string
}
func (v SimpleVar) Flavor() string { return "simple" }
func (v SimpleVar) Origin() string { return v.origin }
func (v SimpleVar) IsDefined() bool { return true }
func (v SimpleVar) String() string { return string(v.value) }
func (v SimpleVar) Eval(w io.Writer, ev *Evaluator) {
w.Write(v.value)
}
func (v SimpleVar) Append(ev *Evaluator, s string) Var {
val, _, err := parseExpr([]byte(s), nil)
if err != nil {
panic(err)
}
buf := bytes.NewBuffer(v.value)
buf.WriteByte(' ')
val.Eval(buf, ev)
v.value = buf.Bytes()
return v
}
func (v SimpleVar) AppendVar(ev *Evaluator, val Var) Var {
buf := bytes.NewBuffer(v.value)
buf.WriteByte(' ')
val.Eval(buf, ev)
v.value = buf.Bytes()
return v
}
type RecursiveVar struct {
expr Value
origin string
}
func (v RecursiveVar) Flavor() string { return "recursive" }
func (v RecursiveVar) Origin() string { return v.origin }
func (v RecursiveVar) IsDefined() bool { return true }
func (v RecursiveVar) String() string { return v.expr.String() }
func (v RecursiveVar) Eval(w io.Writer, ev *Evaluator) {
v.expr.Eval(w, ev)
}
func (v RecursiveVar) Append(_ *Evaluator, s string) Var {
var buf bytes.Buffer
buf.WriteString(v.expr.String())
buf.WriteByte(' ')
buf.WriteString(s)
e, _, err := parseExpr(buf.Bytes(), nil)
if err != nil {
panic(err)
}
v.expr = e
return v
}
func (v RecursiveVar) AppendVar(ev *Evaluator, val Var) Var {
var buf bytes.Buffer
buf.WriteString(v.expr.String())
buf.WriteByte(' ')
buf.WriteString(val.String())
e, _, err := parseExpr(buf.Bytes(), nil)
if err != nil {
panic(err)
}
v.expr = e
return v
}
type UndefinedVar struct{}
func (_ UndefinedVar) Flavor() string { return "undefined" }
func (_ UndefinedVar) Origin() string { return "undefined" }
func (_ UndefinedVar) IsDefined() bool { return false }
func (_ UndefinedVar) String() string { return "" }
func (_ UndefinedVar) Eval(_ io.Writer, _ *Evaluator) {
}
func (_ UndefinedVar) Append(*Evaluator, string) Var {
return UndefinedVar{}
}
func (_ UndefinedVar) AppendVar(_ *Evaluator, val Var) Var {
return UndefinedVar{}
}
type Vars map[string]Var
func (vt Vars) Lookup(name string) Var {
if v, ok := vt[name]; ok {
return v
}
return UndefinedVar{}
}
func (vt Vars) Assign(name string, v Var) {
switch v.Origin() {
case "override", "environment override":
default:
ov := vt.Lookup(name)
if ov.Origin() == "command line" {
return
}
}
vt[name] = v
}
func NewVars(vt Vars) Vars {
r := make(Vars)
r.Merge(vt)
return r
}
func (vt Vars) Merge(vt2 Vars) {
for k, v := range vt2 {
vt[k] = v
}
}
// save saves value of the variable named name.
// calling returned value will restore to the old value at the time
// when save called.
func (vt Vars) save(name string) func() {
v := vt.Lookup(name)
if v.IsDefined() {
return func() {
vt[name] = v
}
}
return func() {
delete(vt, name)
}
}
|
