terraform/internal/lang/funcs/string.go

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package funcs
import (
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"regexp"
"strings"
"github.com/zclconf/go-cty/cty"
"github.com/zclconf/go-cty/cty/function"
)
// ReplaceFunc constructs a function that searches a given string for another
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// given substring, and replaces each occurence with a given replacement string.
var ReplaceFunc = function.New(&function.Spec{
Params: []function.Parameter{
{
Name: "str",
Type: cty.String,
},
{
Name: "substr",
Type: cty.String,
},
{
Name: "replace",
Type: cty.String,
},
},
Type: function.StaticReturnType(cty.String),
Impl: func(args []cty.Value, retType cty.Type) (ret cty.Value, err error) {
str := args[0].AsString()
substr := args[1].AsString()
replace := args[2].AsString()
// We search/replace using a regexp if the string is surrounded
// in forward slashes.
if len(substr) > 1 && substr[0] == '/' && substr[len(substr)-1] == '/' {
re, err := regexp.Compile(substr[1 : len(substr)-1])
if err != nil {
return cty.UnknownVal(cty.String), err
}
return cty.StringVal(re.ReplaceAllString(str, replace)), nil
}
return cty.StringVal(strings.Replace(str, substr, replace, -1)), nil
},
})
// Replace searches a given string for another given substring,
// and replaces all occurences with a given replacement string.
func Replace(str, substr, replace cty.Value) (cty.Value, error) {
return ReplaceFunc.Call([]cty.Value{str, substr, replace})
}