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string.go
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/
string.go
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// Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: MPL-2.0
package funcs
import (
"regexp"
"strings"
"github.com/zclconf/go-cty/cty"
"github.com/zclconf/go-cty/cty/function"
)
// StartsWithFunc constructs a function that checks if a string starts with
// a specific prefix using strings.HasPrefix
var StartsWithFunc = function.New(&function.Spec{
Params: []function.Parameter{
{
Name: "str",
Type: cty.String,
AllowUnknown: true,
},
{
Name: "prefix",
Type: cty.String,
},
},
Type: function.StaticReturnType(cty.Bool),
RefineResult: refineNotNull,
Impl: func(args []cty.Value, retType cty.Type) (cty.Value, error) {
prefix := args[1].AsString()
if !args[0].IsKnown() {
// If the unknown value has a known prefix then we might be
// able to still produce a known result.
if prefix == "" {
// The empty string is a prefix of any string.
return cty.True, nil
}
if knownPrefix := args[0].Range().StringPrefix(); knownPrefix != "" {
if strings.HasPrefix(knownPrefix, prefix) {
return cty.True, nil
}
if len(knownPrefix) >= len(prefix) {
// If the prefix we're testing is no longer than the known
// prefix and it didn't match then the full string with
// that same prefix can't match either.
return cty.False, nil
}
}
return cty.UnknownVal(cty.Bool), nil
}
str := args[0].AsString()
if strings.HasPrefix(str, prefix) {
return cty.True, nil
}
return cty.False, nil
},
})
// EndsWithFunc constructs a function that checks if a string ends with
// a specific suffix using strings.HasSuffix
var EndsWithFunc = function.New(&function.Spec{
Params: []function.Parameter{
{
Name: "str",
Type: cty.String,
},
{
Name: "suffix",
Type: cty.String,
},
},
Type: function.StaticReturnType(cty.Bool),
RefineResult: refineNotNull,
Impl: func(args []cty.Value, retType cty.Type) (cty.Value, error) {
str := args[0].AsString()
suffix := args[1].AsString()
if strings.HasSuffix(str, suffix) {
return cty.True, nil
}
return cty.False, nil
},
})
// ReplaceFunc constructs a function that searches a given string for another
// 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),
RefineResult: refineNotNull,
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
},
})
// StrContainsFunc searches a given string for another given substring,
// if found the function returns true, otherwise returns false.
var StrContainsFunc = function.New(&function.Spec{
Params: []function.Parameter{
{
Name: "str",
Type: cty.String,
},
{
Name: "substr",
Type: cty.String,
},
},
Type: function.StaticReturnType(cty.Bool),
Impl: func(args []cty.Value, retType cty.Type) (ret cty.Value, err error) {
str := args[0].AsString()
substr := args[1].AsString()
if strings.Contains(str, substr) {
return cty.True, nil
}
return cty.False, 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})
}
func StrContains(str, substr cty.Value) (cty.Value, error) {
return StrContainsFunc.Call([]cty.Value{str, substr})
}