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// Copyright 2022 Google Inc. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package starlark_fmt
import (
"fmt"
"reflect"
"sort"
"strconv"
"strings"
)
const (
indent = 4
)
// Indention returns an indent string of the specified level.
func Indention(level int) string {
if level < 0 {
panic(fmt.Errorf("indent level cannot be less than 0, but got %d", level))
}
return strings.Repeat(" ", level*indent)
}
func PrintAny(value any, indentLevel int) string {
return printAnyRecursive(reflect.ValueOf(value), indentLevel)
}
func printAnyRecursive(value reflect.Value, indentLevel int) string {
switch value.Type().Kind() {
case reflect.String:
val := value.String()
if strings.Contains(val, "\"") || strings.Contains(val, "\n") {
return `'''` + val + `'''`
}
return `"` + val + `"`
case reflect.Bool:
if value.Bool() {
return "True"
} else {
return "False"
}
case reflect.Int:
return fmt.Sprintf("%d", value.Int())
case reflect.Slice:
if value.Len() == 0 {
return "[]"
} else if value.Len() == 1 {
return "[" + printAnyRecursive(value.Index(0), indentLevel) + "]"
}
list := make([]string, 0, value.Len()+2)
list = append(list, "[")
innerIndent := Indention(indentLevel + 1)
for i := 0; i < value.Len(); i++ {
list = append(list, innerIndent+printAnyRecursive(value.Index(i), indentLevel+1)+`,`)
}
list = append(list, Indention(indentLevel)+"]")
return strings.Join(list, "\n")
case reflect.Map:
if value.Len() == 0 {
return "{}"
}
items := make([]string, 0, value.Len())
for _, key := range value.MapKeys() {
items = append(items, fmt.Sprintf(`%s%s: %s,`, Indention(indentLevel+1), printAnyRecursive(key, indentLevel+1), printAnyRecursive(value.MapIndex(key), indentLevel+1)))
}
sort.Strings(items)
return fmt.Sprintf(`{
%s
%s}`, strings.Join(items, "\n"), Indention(indentLevel))
case reflect.Struct:
if value.NumField() == 0 {
return "struct()"
}
items := make([]string, 0, value.NumField()+2)
items = append(items, "struct(")
for i := 0; i < value.NumField(); i++ {
if value.Type().Field(i).Anonymous {
panic("anonymous fields aren't supported")
}
name := value.Type().Field(i).Name
items = append(items, fmt.Sprintf(`%s%s = %s,`, Indention(indentLevel+1), name, printAnyRecursive(value.Field(i), indentLevel+1)))
}
items = append(items, Indention(indentLevel)+")")
return strings.Join(items, "\n")
default:
panic("Unhandled kind: " + value.Kind().String())
}
}
// PrintBool returns a Starlark compatible bool string.
func PrintBool(item bool) string {
if item {
return "True"
} else {
return "False"
}
}
// PrintsStringList returns a Starlark-compatible string of a list of Strings/Labels.
func PrintStringList(items []string, indentLevel int) string {
return PrintList(items, indentLevel, func(s string) string {
if strings.Contains(s, "\"") {
return `'''%s'''`
}
return `"%s"`
})
}
// PrintList returns a Starlark-compatible string of list formmated as requested.
func PrintList(items []string, indentLevel int, formatString func(string) string) string {
if len(items) == 0 {
return "[]"
} else if len(items) == 1 {
return fmt.Sprintf("["+formatString(items[0])+"]", items[0])
}
list := make([]string, 0, len(items)+2)
list = append(list, "[")
innerIndent := Indention(indentLevel + 1)
for _, item := range items {
list = append(list, fmt.Sprintf(`%s`+formatString(item)+`,`, innerIndent, item))
}
list = append(list, Indention(indentLevel)+"]")
return strings.Join(list, "\n")
}
// PrintStringListDict returns a Starlark-compatible string formatted as dictionary with
// string keys and list of string values.
func PrintStringListDict(dict map[string][]string, indentLevel int) string {
formattedValueDict := make(map[string]string, len(dict))
for k, v := range dict {
formattedValueDict[k] = PrintStringList(v, indentLevel+1)
}
return PrintDict(formattedValueDict, indentLevel)
}
// PrintBoolDict returns a starlark-compatible string containing a dictionary with string keys and
// values printed with no additional formatting.
func PrintBoolDict(dict map[string]bool, indentLevel int) string {
formattedValueDict := make(map[string]string, len(dict))
for k, v := range dict {
formattedValueDict[k] = PrintBool(v)
}
return PrintDict(formattedValueDict, indentLevel)
}
// PrintStringIntDict returns a Starlark-compatible string formatted as dictionary with
// string keys and int values.
func PrintStringIntDict(dict map[string]int, indentLevel int) string {
valDict := make(map[string]string, len(dict))
for k, v := range dict {
valDict[k] = strconv.Itoa(v)
}
return PrintDict(valDict, indentLevel)
}
// PrintStringStringDict returns a Starlark-compatible string formatted as dictionary with
// string keys and string values.
func PrintStringStringDict(dict map[string]string, indentLevel int) string {
valDict := make(map[string]string, len(dict))
for k, v := range dict {
valDict[k] = fmt.Sprintf(`"%s"`, v)
}
return PrintDict(valDict, indentLevel)
}
// PrintDict returns a starlark-compatible string containing a dictionary with string keys and
// values printed with no additional formatting.
func PrintDict(dict map[string]string, indentLevel int) string {
if len(dict) == 0 {
return "{}"
}
items := make([]string, 0, len(dict))
for k, v := range dict {
items = append(items, fmt.Sprintf(`%s"%s": %s,`, Indention(indentLevel+1), k, v))
}
sort.Strings(items)
return fmt.Sprintf(`{
%s
%s}`, strings.Join(items, "\n"), Indention(indentLevel))
}
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