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subst.go
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subst.go
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package dsl
import (
"encoding/json"
"fmt"
"io/ioutil"
"regexp"
"github.com/Comcast/plax/subst"
)
func maybeUnmarshalString(s string) (string, bool) {
var x interface{}
if err := json.Unmarshal([]byte(s), &x); err == nil {
if s, is := x.(string); is {
return s, true
}
}
return s, false
}
func maybeMarshalString(s string, maybe bool) (string, error) {
if !maybe {
return s, nil
}
js, err := subst.JSONMarshal(&s)
if err != nil {
return "", err
}
return string(js), nil
}
var atAtFilename = regexp.MustCompile(`"?{@@(.+?)}"?`)
func atAtSub(ctx *Ctx, s string) (string, error) {
s, un := maybeUnmarshalString(s)
var err error
y := atAtFilename.ReplaceAllStringFunc(s, func(s string) string {
m := atAtFilename.FindStringSubmatch(s)
if len(m) != 2 {
err = Brokenf("internal error: failed to @@ submatch on '%s'", s)
return fmt.Sprintf("<error: %s>", err)
}
filename := m[1]
var bs []byte
if bs, err = ioutil.ReadFile(ctx.Dir + "/" + filename); err != nil {
return fmt.Sprintf("<error: %s>", err)
}
return string(bs)
})
if err != nil {
return "", err
}
if y, err = maybeMarshalString(y, un); err != nil {
return "", err
}
return y, nil
}
var bangBangFilename = regexp.MustCompile(`"?{!!(.+?)!!}"?`)
func bangBangSub(ctx *Ctx, s string) (string, error) {
s, un := maybeUnmarshalString(s)
var err error
y := bangBangFilename.ReplaceAllStringFunc(s, func(s string) string {
m := bangBangFilename.FindStringSubmatch(s)
if len(m) != 2 {
err = Brokenf("internal error: failed to !! submatch on '%s'", s)
return fmt.Sprintf("<error: %s>", err)
}
src := m[1]
ctx.Inddf(" Expansion: Javascript '%s'", short(src))
var x interface{}
if x, err = JSExec(ctx, src, nil); err != nil {
return fmt.Sprintf("<error: %s>", err)
}
str, is := x.(string)
if !is {
var js []byte
if js, err = subst.JSONMarshal(&x); err != nil {
return fmt.Sprintf("<error: %s>", err)
}
str = string(js)
}
return str
})
if err != nil {
return "", err
}
if y, err = maybeMarshalString(y, un); err != nil {
return "", err
}
return y, nil
}