5
0
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matterbridge/vendor/github.com/d5/tengo/v2/stdlib/text.go
2020-01-09 21:52:19 +01:00

1073 lines
22 KiB
Go

package stdlib
import (
"fmt"
"regexp"
"strconv"
"strings"
"unicode/utf8"
"github.com/d5/tengo/v2"
)
var textModule = map[string]tengo.Object{
"re_match": &tengo.UserFunction{
Name: "re_match",
Value: textREMatch,
}, // re_match(pattern, text) => bool/error
"re_find": &tengo.UserFunction{
Name: "re_find",
Value: textREFind,
}, // re_find(pattern, text, count) => [[{text:,begin:,end:}]]/undefined
"re_replace": &tengo.UserFunction{
Name: "re_replace",
Value: textREReplace,
}, // re_replace(pattern, text, repl) => string/error
"re_split": &tengo.UserFunction{
Name: "re_split",
Value: textRESplit,
}, // re_split(pattern, text, count) => [string]/error
"re_compile": &tengo.UserFunction{
Name: "re_compile",
Value: textRECompile,
}, // re_compile(pattern) => Regexp/error
"compare": &tengo.UserFunction{
Name: "compare",
Value: FuncASSRI(strings.Compare),
}, // compare(a, b) => int
"contains": &tengo.UserFunction{
Name: "contains",
Value: FuncASSRB(strings.Contains),
}, // contains(s, substr) => bool
"contains_any": &tengo.UserFunction{
Name: "contains_any",
Value: FuncASSRB(strings.ContainsAny),
}, // contains_any(s, chars) => bool
"count": &tengo.UserFunction{
Name: "count",
Value: FuncASSRI(strings.Count),
}, // count(s, substr) => int
"equal_fold": &tengo.UserFunction{
Name: "equal_fold",
Value: FuncASSRB(strings.EqualFold),
}, // "equal_fold(s, t) => bool
"fields": &tengo.UserFunction{
Name: "fields",
Value: FuncASRSs(strings.Fields),
}, // fields(s) => [string]
"has_prefix": &tengo.UserFunction{
Name: "has_prefix",
Value: FuncASSRB(strings.HasPrefix),
}, // has_prefix(s, prefix) => bool
"has_suffix": &tengo.UserFunction{
Name: "has_suffix",
Value: FuncASSRB(strings.HasSuffix),
}, // has_suffix(s, suffix) => bool
"index": &tengo.UserFunction{
Name: "index",
Value: FuncASSRI(strings.Index),
}, // index(s, substr) => int
"index_any": &tengo.UserFunction{
Name: "index_any",
Value: FuncASSRI(strings.IndexAny),
}, // index_any(s, chars) => int
"join": &tengo.UserFunction{
Name: "join",
Value: textJoin,
}, // join(arr, sep) => string
"last_index": &tengo.UserFunction{
Name: "last_index",
Value: FuncASSRI(strings.LastIndex),
}, // last_index(s, substr) => int
"last_index_any": &tengo.UserFunction{
Name: "last_index_any",
Value: FuncASSRI(strings.LastIndexAny),
}, // last_index_any(s, chars) => int
"repeat": &tengo.UserFunction{
Name: "repeat",
Value: textRepeat,
}, // repeat(s, count) => string
"replace": &tengo.UserFunction{
Name: "replace",
Value: textReplace,
}, // replace(s, old, new, n) => string
"substr": &tengo.UserFunction{
Name: "substr",
Value: textSubstring,
}, // substr(s, lower, upper) => string
"split": &tengo.UserFunction{
Name: "split",
Value: FuncASSRSs(strings.Split),
}, // split(s, sep) => [string]
"split_after": &tengo.UserFunction{
Name: "split_after",
Value: FuncASSRSs(strings.SplitAfter),
}, // split_after(s, sep) => [string]
"split_after_n": &tengo.UserFunction{
Name: "split_after_n",
Value: FuncASSIRSs(strings.SplitAfterN),
}, // split_after_n(s, sep, n) => [string]
"split_n": &tengo.UserFunction{
Name: "split_n",
Value: FuncASSIRSs(strings.SplitN),
}, // split_n(s, sep, n) => [string]
"title": &tengo.UserFunction{
Name: "title",
Value: FuncASRS(strings.Title),
}, // title(s) => string
"to_lower": &tengo.UserFunction{
Name: "to_lower",
Value: FuncASRS(strings.ToLower),
}, // to_lower(s) => string
"to_title": &tengo.UserFunction{
Name: "to_title",
Value: FuncASRS(strings.ToTitle),
}, // to_title(s) => string
"to_upper": &tengo.UserFunction{
Name: "to_upper",
Value: FuncASRS(strings.ToUpper),
}, // to_upper(s) => string
"pad_left": &tengo.UserFunction{
Name: "pad_left",
Value: textPadLeft,
}, // pad_left(s, pad_len, pad_with) => string
"pad_right": &tengo.UserFunction{
Name: "pad_right",
Value: textPadRight,
}, // pad_right(s, pad_len, pad_with) => string
"trim": &tengo.UserFunction{
Name: "trim",
Value: FuncASSRS(strings.Trim),
}, // trim(s, cutset) => string
"trim_left": &tengo.UserFunction{
Name: "trim_left",
Value: FuncASSRS(strings.TrimLeft),
}, // trim_left(s, cutset) => string
"trim_prefix": &tengo.UserFunction{
Name: "trim_prefix",
Value: FuncASSRS(strings.TrimPrefix),
}, // trim_prefix(s, prefix) => string
"trim_right": &tengo.UserFunction{
Name: "trim_right",
Value: FuncASSRS(strings.TrimRight),
}, // trim_right(s, cutset) => string
"trim_space": &tengo.UserFunction{
Name: "trim_space",
Value: FuncASRS(strings.TrimSpace),
}, // trim_space(s) => string
"trim_suffix": &tengo.UserFunction{
Name: "trim_suffix",
Value: FuncASSRS(strings.TrimSuffix),
}, // trim_suffix(s, suffix) => string
"atoi": &tengo.UserFunction{
Name: "atoi",
Value: FuncASRIE(strconv.Atoi),
}, // atoi(str) => int/error
"format_bool": &tengo.UserFunction{
Name: "format_bool",
Value: textFormatBool,
}, // format_bool(b) => string
"format_float": &tengo.UserFunction{
Name: "format_float",
Value: textFormatFloat,
}, // format_float(f, fmt, prec, bits) => string
"format_int": &tengo.UserFunction{
Name: "format_int",
Value: textFormatInt,
}, // format_int(i, base) => string
"itoa": &tengo.UserFunction{
Name: "itoa",
Value: FuncAIRS(strconv.Itoa),
}, // itoa(i) => string
"parse_bool": &tengo.UserFunction{
Name: "parse_bool",
Value: textParseBool,
}, // parse_bool(str) => bool/error
"parse_float": &tengo.UserFunction{
Name: "parse_float",
Value: textParseFloat,
}, // parse_float(str, bits) => float/error
"parse_int": &tengo.UserFunction{
Name: "parse_int",
Value: textParseInt,
}, // parse_int(str, base, bits) => int/error
"quote": &tengo.UserFunction{
Name: "quote",
Value: FuncASRS(strconv.Quote),
}, // quote(str) => string
"unquote": &tengo.UserFunction{
Name: "unquote",
Value: FuncASRSE(strconv.Unquote),
}, // unquote(str) => string/error
}
func textREMatch(args ...tengo.Object) (ret tengo.Object, err error) {
if len(args) != 2 {
err = tengo.ErrWrongNumArguments
return
}
s1, ok := tengo.ToString(args[0])
if !ok {
err = tengo.ErrInvalidArgumentType{
Name: "first",
Expected: "string(compatible)",
Found: args[0].TypeName(),
}
return
}
s2, ok := tengo.ToString(args[1])
if !ok {
err = tengo.ErrInvalidArgumentType{
Name: "second",
Expected: "string(compatible)",
Found: args[1].TypeName(),
}
return
}
matched, err := regexp.MatchString(s1, s2)
if err != nil {
ret = wrapError(err)
return
}
if matched {
ret = tengo.TrueValue
} else {
ret = tengo.FalseValue
}
return
}
func textREFind(args ...tengo.Object) (ret tengo.Object, err error) {
numArgs := len(args)
if numArgs != 2 && numArgs != 3 {
err = tengo.ErrWrongNumArguments
return
}
s1, ok := tengo.ToString(args[0])
if !ok {
err = tengo.ErrInvalidArgumentType{
Name: "first",
Expected: "string(compatible)",
Found: args[0].TypeName(),
}
return
}
re, err := regexp.Compile(s1)
if err != nil {
ret = wrapError(err)
return
}
s2, ok := tengo.ToString(args[1])
if !ok {
err = tengo.ErrInvalidArgumentType{
Name: "second",
Expected: "string(compatible)",
Found: args[1].TypeName(),
}
return
}
if numArgs < 3 {
m := re.FindStringSubmatchIndex(s2)
if m == nil {
ret = tengo.UndefinedValue
return
}
arr := &tengo.Array{}
for i := 0; i < len(m); i += 2 {
arr.Value = append(arr.Value,
&tengo.ImmutableMap{Value: map[string]tengo.Object{
"text": &tengo.String{Value: s2[m[i]:m[i+1]]},
"begin": &tengo.Int{Value: int64(m[i])},
"end": &tengo.Int{Value: int64(m[i+1])},
}})
}
ret = &tengo.Array{Value: []tengo.Object{arr}}
return
}
i3, ok := tengo.ToInt(args[2])
if !ok {
err = tengo.ErrInvalidArgumentType{
Name: "third",
Expected: "int(compatible)",
Found: args[2].TypeName(),
}
return
}
m := re.FindAllStringSubmatchIndex(s2, i3)
if m == nil {
ret = tengo.UndefinedValue
return
}
arr := &tengo.Array{}
for _, m := range m {
subMatch := &tengo.Array{}
for i := 0; i < len(m); i += 2 {
subMatch.Value = append(subMatch.Value,
&tengo.ImmutableMap{Value: map[string]tengo.Object{
"text": &tengo.String{Value: s2[m[i]:m[i+1]]},
"begin": &tengo.Int{Value: int64(m[i])},
"end": &tengo.Int{Value: int64(m[i+1])},
}})
}
arr.Value = append(arr.Value, subMatch)
}
ret = arr
return
}
func textREReplace(args ...tengo.Object) (ret tengo.Object, err error) {
if len(args) != 3 {
err = tengo.ErrWrongNumArguments
return
}
s1, ok := tengo.ToString(args[0])
if !ok {
err = tengo.ErrInvalidArgumentType{
Name: "first",
Expected: "string(compatible)",
Found: args[0].TypeName(),
}
return
}
s2, ok := tengo.ToString(args[1])
if !ok {
err = tengo.ErrInvalidArgumentType{
Name: "second",
Expected: "string(compatible)",
Found: args[1].TypeName(),
}
return
}
s3, ok := tengo.ToString(args[2])
if !ok {
err = tengo.ErrInvalidArgumentType{
Name: "third",
Expected: "string(compatible)",
Found: args[2].TypeName(),
}
return
}
re, err := regexp.Compile(s1)
if err != nil {
ret = wrapError(err)
} else {
s, ok := doTextRegexpReplace(re, s2, s3)
if !ok {
return nil, tengo.ErrStringLimit
}
ret = &tengo.String{Value: s}
}
return
}
func textRESplit(args ...tengo.Object) (ret tengo.Object, err error) {
numArgs := len(args)
if numArgs != 2 && numArgs != 3 {
err = tengo.ErrWrongNumArguments
return
}
s1, ok := tengo.ToString(args[0])
if !ok {
err = tengo.ErrInvalidArgumentType{
Name: "first",
Expected: "string(compatible)",
Found: args[0].TypeName(),
}
return
}
s2, ok := tengo.ToString(args[1])
if !ok {
err = tengo.ErrInvalidArgumentType{
Name: "second",
Expected: "string(compatible)",
Found: args[1].TypeName(),
}
return
}
var i3 = -1
if numArgs > 2 {
i3, ok = tengo.ToInt(args[2])
if !ok {
err = tengo.ErrInvalidArgumentType{
Name: "third",
Expected: "int(compatible)",
Found: args[2].TypeName(),
}
return
}
}
re, err := regexp.Compile(s1)
if err != nil {
ret = wrapError(err)
return
}
arr := &tengo.Array{}
for _, s := range re.Split(s2, i3) {
arr.Value = append(arr.Value, &tengo.String{Value: s})
}
ret = arr
return
}
func textRECompile(args ...tengo.Object) (ret tengo.Object, err error) {
if len(args) != 1 {
err = tengo.ErrWrongNumArguments
return
}
s1, ok := tengo.ToString(args[0])
if !ok {
err = tengo.ErrInvalidArgumentType{
Name: "first",
Expected: "string(compatible)",
Found: args[0].TypeName(),
}
return
}
re, err := regexp.Compile(s1)
if err != nil {
ret = wrapError(err)
} else {
ret = makeTextRegexp(re)
}
return
}
func textReplace(args ...tengo.Object) (ret tengo.Object, err error) {
if len(args) != 4 {
err = tengo.ErrWrongNumArguments
return
}
s1, ok := tengo.ToString(args[0])
if !ok {
err = tengo.ErrInvalidArgumentType{
Name: "first",
Expected: "string(compatible)",
Found: args[0].TypeName(),
}
return
}
s2, ok := tengo.ToString(args[1])
if !ok {
err = tengo.ErrInvalidArgumentType{
Name: "second",
Expected: "string(compatible)",
Found: args[1].TypeName(),
}
return
}
s3, ok := tengo.ToString(args[2])
if !ok {
err = tengo.ErrInvalidArgumentType{
Name: "third",
Expected: "string(compatible)",
Found: args[2].TypeName(),
}
return
}
i4, ok := tengo.ToInt(args[3])
if !ok {
err = tengo.ErrInvalidArgumentType{
Name: "fourth",
Expected: "int(compatible)",
Found: args[3].TypeName(),
}
return
}
s, ok := doTextReplace(s1, s2, s3, i4)
if !ok {
err = tengo.ErrStringLimit
return
}
ret = &tengo.String{Value: s}
return
}
func textSubstring(args ...tengo.Object) (ret tengo.Object, err error) {
argslen := len(args)
if argslen != 2 && argslen != 3 {
err = tengo.ErrWrongNumArguments
return
}
s1, ok := tengo.ToString(args[0])
if !ok {
err = tengo.ErrInvalidArgumentType{
Name: "first",
Expected: "string(compatible)",
Found: args[0].TypeName(),
}
return
}
i2, ok := tengo.ToInt(args[1])
if !ok {
err = tengo.ErrInvalidArgumentType{
Name: "second",
Expected: "int(compatible)",
Found: args[1].TypeName(),
}
return
}
strlen := len(s1)
i3 := strlen
if argslen == 3 {
i3, ok = tengo.ToInt(args[2])
if !ok {
err = tengo.ErrInvalidArgumentType{
Name: "third",
Expected: "int(compatible)",
Found: args[2].TypeName(),
}
return
}
}
if i2 > i3 {
err = tengo.ErrInvalidIndexType
return
}
if i2 < 0 {
i2 = 0
} else if i2 > strlen {
i2 = strlen
}
if i3 < 0 {
i3 = 0
} else if i3 > strlen {
i3 = strlen
}
ret = &tengo.String{Value: s1[i2:i3]}
return
}
func textPadLeft(args ...tengo.Object) (ret tengo.Object, err error) {
argslen := len(args)
if argslen != 2 && argslen != 3 {
err = tengo.ErrWrongNumArguments
return
}
s1, ok := tengo.ToString(args[0])
if !ok {
err = tengo.ErrInvalidArgumentType{
Name: "first",
Expected: "string(compatible)",
Found: args[0].TypeName(),
}
return
}
i2, ok := tengo.ToInt(args[1])
if !ok {
err = tengo.ErrInvalidArgumentType{
Name: "second",
Expected: "int(compatible)",
Found: args[1].TypeName(),
}
return
}
if i2 > tengo.MaxStringLen {
return nil, tengo.ErrStringLimit
}
sLen := len(s1)
if sLen >= i2 {
ret = &tengo.String{Value: s1}
return
}
s3 := " "
if argslen == 3 {
s3, ok = tengo.ToString(args[2])
if !ok {
err = tengo.ErrInvalidArgumentType{
Name: "third",
Expected: "string(compatible)",
Found: args[2].TypeName(),
}
return
}
}
padStrLen := len(s3)
if padStrLen == 0 {
ret = &tengo.String{Value: s1}
return
}
padCount := ((i2 - padStrLen) / padStrLen) + 1
retStr := strings.Repeat(s3, padCount) + s1
ret = &tengo.String{Value: retStr[len(retStr)-i2:]}
return
}
func textPadRight(args ...tengo.Object) (ret tengo.Object, err error) {
argslen := len(args)
if argslen != 2 && argslen != 3 {
err = tengo.ErrWrongNumArguments
return
}
s1, ok := tengo.ToString(args[0])
if !ok {
err = tengo.ErrInvalidArgumentType{
Name: "first",
Expected: "string(compatible)",
Found: args[0].TypeName(),
}
return
}
i2, ok := tengo.ToInt(args[1])
if !ok {
err = tengo.ErrInvalidArgumentType{
Name: "second",
Expected: "int(compatible)",
Found: args[1].TypeName(),
}
return
}
if i2 > tengo.MaxStringLen {
return nil, tengo.ErrStringLimit
}
sLen := len(s1)
if sLen >= i2 {
ret = &tengo.String{Value: s1}
return
}
s3 := " "
if argslen == 3 {
s3, ok = tengo.ToString(args[2])
if !ok {
err = tengo.ErrInvalidArgumentType{
Name: "third",
Expected: "string(compatible)",
Found: args[2].TypeName(),
}
return
}
}
padStrLen := len(s3)
if padStrLen == 0 {
ret = &tengo.String{Value: s1}
return
}
padCount := ((i2 - padStrLen) / padStrLen) + 1
retStr := s1 + strings.Repeat(s3, padCount)
ret = &tengo.String{Value: retStr[:i2]}
return
}
func textRepeat(args ...tengo.Object) (ret tengo.Object, err error) {
if len(args) != 2 {
return nil, tengo.ErrWrongNumArguments
}
s1, ok := tengo.ToString(args[0])
if !ok {
return nil, tengo.ErrInvalidArgumentType{
Name: "first",
Expected: "string(compatible)",
Found: args[0].TypeName(),
}
}
i2, ok := tengo.ToInt(args[1])
if !ok {
return nil, tengo.ErrInvalidArgumentType{
Name: "second",
Expected: "int(compatible)",
Found: args[1].TypeName(),
}
}
if len(s1)*i2 > tengo.MaxStringLen {
return nil, tengo.ErrStringLimit
}
return &tengo.String{Value: strings.Repeat(s1, i2)}, nil
}
func textJoin(args ...tengo.Object) (ret tengo.Object, err error) {
if len(args) != 2 {
return nil, tengo.ErrWrongNumArguments
}
var slen int
var ss1 []string
switch arg0 := args[0].(type) {
case *tengo.Array:
for idx, a := range arg0.Value {
as, ok := tengo.ToString(a)
if !ok {
return nil, tengo.ErrInvalidArgumentType{
Name: fmt.Sprintf("first[%d]", idx),
Expected: "string(compatible)",
Found: a.TypeName(),
}
}
slen += len(as)
ss1 = append(ss1, as)
}
case *tengo.ImmutableArray:
for idx, a := range arg0.Value {
as, ok := tengo.ToString(a)
if !ok {
return nil, tengo.ErrInvalidArgumentType{
Name: fmt.Sprintf("first[%d]", idx),
Expected: "string(compatible)",
Found: a.TypeName(),
}
}
slen += len(as)
ss1 = append(ss1, as)
}
default:
return nil, tengo.ErrInvalidArgumentType{
Name: "first",
Expected: "array",
Found: args[0].TypeName(),
}
}
s2, ok := tengo.ToString(args[1])
if !ok {
return nil, tengo.ErrInvalidArgumentType{
Name: "second",
Expected: "string(compatible)",
Found: args[1].TypeName(),
}
}
// make sure output length does not exceed the limit
if slen+len(s2)*(len(ss1)-1) > tengo.MaxStringLen {
return nil, tengo.ErrStringLimit
}
return &tengo.String{Value: strings.Join(ss1, s2)}, nil
}
func textFormatBool(args ...tengo.Object) (ret tengo.Object, err error) {
if len(args) != 1 {
err = tengo.ErrWrongNumArguments
return
}
b1, ok := args[0].(*tengo.Bool)
if !ok {
err = tengo.ErrInvalidArgumentType{
Name: "first",
Expected: "bool",
Found: args[0].TypeName(),
}
return
}
if b1 == tengo.TrueValue {
ret = &tengo.String{Value: "true"}
} else {
ret = &tengo.String{Value: "false"}
}
return
}
func textFormatFloat(args ...tengo.Object) (ret tengo.Object, err error) {
if len(args) != 4 {
err = tengo.ErrWrongNumArguments
return
}
f1, ok := args[0].(*tengo.Float)
if !ok {
err = tengo.ErrInvalidArgumentType{
Name: "first",
Expected: "float",
Found: args[0].TypeName(),
}
return
}
s2, ok := tengo.ToString(args[1])
if !ok {
err = tengo.ErrInvalidArgumentType{
Name: "second",
Expected: "string(compatible)",
Found: args[1].TypeName(),
}
return
}
i3, ok := tengo.ToInt(args[2])
if !ok {
err = tengo.ErrInvalidArgumentType{
Name: "third",
Expected: "int(compatible)",
Found: args[2].TypeName(),
}
return
}
i4, ok := tengo.ToInt(args[3])
if !ok {
err = tengo.ErrInvalidArgumentType{
Name: "fourth",
Expected: "int(compatible)",
Found: args[3].TypeName(),
}
return
}
ret = &tengo.String{Value: strconv.FormatFloat(f1.Value, s2[0], i3, i4)}
return
}
func textFormatInt(args ...tengo.Object) (ret tengo.Object, err error) {
if len(args) != 2 {
err = tengo.ErrWrongNumArguments
return
}
i1, ok := args[0].(*tengo.Int)
if !ok {
err = tengo.ErrInvalidArgumentType{
Name: "first",
Expected: "int",
Found: args[0].TypeName(),
}
return
}
i2, ok := tengo.ToInt(args[1])
if !ok {
err = tengo.ErrInvalidArgumentType{
Name: "second",
Expected: "int(compatible)",
Found: args[1].TypeName(),
}
return
}
ret = &tengo.String{Value: strconv.FormatInt(i1.Value, i2)}
return
}
func textParseBool(args ...tengo.Object) (ret tengo.Object, err error) {
if len(args) != 1 {
err = tengo.ErrWrongNumArguments
return
}
s1, ok := args[0].(*tengo.String)
if !ok {
err = tengo.ErrInvalidArgumentType{
Name: "first",
Expected: "string",
Found: args[0].TypeName(),
}
return
}
parsed, err := strconv.ParseBool(s1.Value)
if err != nil {
ret = wrapError(err)
return
}
if parsed {
ret = tengo.TrueValue
} else {
ret = tengo.FalseValue
}
return
}
func textParseFloat(args ...tengo.Object) (ret tengo.Object, err error) {
if len(args) != 2 {
err = tengo.ErrWrongNumArguments
return
}
s1, ok := args[0].(*tengo.String)
if !ok {
err = tengo.ErrInvalidArgumentType{
Name: "first",
Expected: "string",
Found: args[0].TypeName(),
}
return
}
i2, ok := tengo.ToInt(args[1])
if !ok {
err = tengo.ErrInvalidArgumentType{
Name: "second",
Expected: "int(compatible)",
Found: args[1].TypeName(),
}
return
}
parsed, err := strconv.ParseFloat(s1.Value, i2)
if err != nil {
ret = wrapError(err)
return
}
ret = &tengo.Float{Value: parsed}
return
}
func textParseInt(args ...tengo.Object) (ret tengo.Object, err error) {
if len(args) != 3 {
err = tengo.ErrWrongNumArguments
return
}
s1, ok := args[0].(*tengo.String)
if !ok {
err = tengo.ErrInvalidArgumentType{
Name: "first",
Expected: "string",
Found: args[0].TypeName(),
}
return
}
i2, ok := tengo.ToInt(args[1])
if !ok {
err = tengo.ErrInvalidArgumentType{
Name: "second",
Expected: "int(compatible)",
Found: args[1].TypeName(),
}
return
}
i3, ok := tengo.ToInt(args[2])
if !ok {
err = tengo.ErrInvalidArgumentType{
Name: "third",
Expected: "int(compatible)",
Found: args[2].TypeName(),
}
return
}
parsed, err := strconv.ParseInt(s1.Value, i2, i3)
if err != nil {
ret = wrapError(err)
return
}
ret = &tengo.Int{Value: parsed}
return
}
// Modified implementation of strings.Replace
// to limit the maximum length of output string.
func doTextReplace(s, old, new string, n int) (string, bool) {
if old == new || n == 0 {
return s, true // avoid allocation
}
// Compute number of replacements.
if m := strings.Count(s, old); m == 0 {
return s, true // avoid allocation
} else if n < 0 || m < n {
n = m
}
// Apply replacements to buffer.
t := make([]byte, len(s)+n*(len(new)-len(old)))
w := 0
start := 0
for i := 0; i < n; i++ {
j := start
if len(old) == 0 {
if i > 0 {
_, wid := utf8.DecodeRuneInString(s[start:])
j += wid
}
} else {
j += strings.Index(s[start:], old)
}
ssj := s[start:j]
if w+len(ssj)+len(new) > tengo.MaxStringLen {
return "", false
}
w += copy(t[w:], ssj)
w += copy(t[w:], new)
start = j + len(old)
}
ss := s[start:]
if w+len(ss) > tengo.MaxStringLen {
return "", false
}
w += copy(t[w:], ss)
return string(t[0:w]), true
}