forked from robertkrimen/otto
/
type_regexp.go
248 lines (230 loc) · 6.83 KB
/
type_regexp.go
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package otto
import (
"bytes"
"fmt"
"regexp"
"strings"
"unicode/utf8"
)
type _regExpObject struct {
regularExpression *regexp.Regexp
global bool
ignoreCase bool
multiline bool
source string
flags string
}
func (runtime *_runtime) newRegExpObject(pattern string, flags string) *_object {
self := runtime.newObject()
self.class = "RegExp"
global := false
ignoreCase := false
multiline := false
re2flags := ""
for _, chr := range flags {
switch chr {
case 'g':
if global {
panic(newError("SyntaxError: newRegExpObject: %s %s", pattern, flags))
}
global = true
case 'm':
if multiline {
panic(newError("SyntaxError: newRegExpObject: %s %s", pattern, flags))
}
multiline = true
re2flags += "m"
case 'i':
if ignoreCase {
panic(newError("SyntaxError: newRegExpObject: %s %s", pattern, flags))
}
ignoreCase = true
re2flags += "i"
}
}
re2pattern := transformRegExp(pattern)
if len(re2flags) > 0 {
re2pattern = fmt.Sprintf("(?%s:%s)", re2flags, re2pattern)
}
regularExpression, err := regexp.Compile(re2pattern)
if err != nil {
panic(newSyntaxError("Invalid regular expression: %s", err.Error()[22:]))
}
self.value = _regExpObject{
regularExpression: regularExpression,
global: global,
ignoreCase: ignoreCase,
multiline: multiline,
source: pattern,
flags: flags,
}
self.defineProperty("global", toValue_bool(global), 0, false)
self.defineProperty("ignoreCase", toValue_bool(ignoreCase), 0, false)
self.defineProperty("multiline", toValue_bool(multiline), 0, false)
self.defineProperty("lastIndex", toValue_int(0), 0100, false)
self.defineProperty("source", toValue_string(pattern), 0, false)
return self
}
func (self *_object) regExpValue() _regExpObject {
value, _ := self.value.(_regExpObject)
return value
}
func execRegExp(this *_object, target string) (match bool, result []int) {
if this.class != "RegExp" {
panic(newTypeError("Calling RegExp.exec on a non-RegExp object"))
}
lastIndex := toInteger(this.get("lastIndex")).value
index := lastIndex
global := toBoolean(this.get("global"))
if !global {
index = 0
}
if 0 > index || index > int64(len(target)) {
} else {
result = this.regExpValue().regularExpression.FindStringSubmatchIndex(target[index:])
}
if result == nil {
//this.defineProperty("lastIndex", toValue_(0), 0111, true)
this.put("lastIndex", toValue_int(0), true)
return // !match
}
match = true
startIndex := index
endIndex := int(lastIndex) + result[1]
// We do this shift here because the .FindStringSubmatchIndex above
// was done on a local subordinate slice of the string, not the whole string
for index, _ := range result {
result[index] += int(startIndex)
}
if global {
//this.defineProperty("lastIndex", toValue_(endIndex), 0111, true)
this.put("lastIndex", toValue_int(endIndex), true)
}
return // match
}
func execResultToArray(runtime *_runtime, target string, result []int) *_object {
captureCount := len(result) / 2
valueArray := make([]Value, captureCount)
for index := 0; index < captureCount; index++ {
offset := 2 * index
if result[offset] != -1 {
valueArray[index] = toValue_string(target[result[offset]:result[offset+1]])
} else {
valueArray[index] = UndefinedValue()
}
}
matchIndex := result[0]
if matchIndex != 0 {
matchIndex = 0
// Find the rune index in the string, not the byte index
for index := 0; index < result[0]; {
_, size := utf8.DecodeRuneInString(target[index:])
matchIndex += 1
index += size
}
}
match := runtime.newArrayOf(valueArray)
match.defineProperty("input", toValue_string(target), 0111, false)
match.defineProperty("index", toValue_int(matchIndex), 0111, false)
return match
}
// 0031,0032,0033,0034,0035,0036,0037,0038,0039 // 1 - 9
// 0043,0045,0046,0047,0048,0049,004A,004B,004C,004D,004E,004F
// 0050,0052,0054,0055,0056,0058,0059,005A
// 0063,0065,0067,0068,0069,006A,006B,006C,006D,006F
// 0070,0071,0075,0078,0079
// 0080,0081,0082,0083,0084,0085,0086,0087,0088,0089,008A,008B,008C,008D,008E,008F
// 0090,0091,0092,0093,0094,0095,0096,0097,0098,0099,009A,009B,009C,009D,009E,009F
// 00A0,00A1,00A2,00A3,00A4,00A5,00A6,00A7,00A8,00A9,00AA,00AB,00AC,00AD,00AE,00AF
// 00B0,00B1,00B2,00B3,00B4,00B5,00B6,00B7,00B8,00B9,00BA,00BB,00BC,00BD,00BE,00BF
// 00C0,00C1,00C2,00C3,00C4,00C5,00C6,00C7,00C8,00C9,00CA,00CB,00CC,00CD,00CE,00CF
// ...
// c = 63* c[A-Z]
// p = 70
// u = 75* u[:xdigit:]{4}
// x = 78* x[:xdigit:]{2}
//\x{0031}-\x{0039}
var transformRegExp_matchSlashU = regexp.MustCompile(`\\u([[:xdigit:]]{1,4})`)
var transformRegExp_escape_c = regexp.MustCompile(`\\c([A-Za-z])`)
var transformRegExp_unescape_c = regexp.MustCompile(`\\c`)
var transformRegExp_unescape = []*regexp.Regexp{
regexp.MustCompile(strings.NewReplacer("\n", "", "\t", "", " ", "").Replace(`
\\(
[
\x{0043}\x{0045}-\x{004F}
\x{0050}\x{0052}\x{0054}-\x{0056}\x{0058}-\x{005A}
\x{0065}\x{0067}-\x{006D}\x{006F}
\x{0070}\x{0071}\x{0079}
\x{0080}-\x{FFFF}
]
)()
`)),
regexp.MustCompile(`\\(u)([^[:xdigit:]])`),
regexp.MustCompile(`\\(u)([[:xdigit:]][^[:xdigit:]])`),
regexp.MustCompile(`\\(u)([[:xdigit:]][[:xdigit:]][^[:xdigit:]])`),
regexp.MustCompile(`\\(u)([[:xdigit:]][[:xdigit:]][[:xdigit:]][^[:xdigit:]])`),
regexp.MustCompile(`\\(x)([^[:xdigit:]])`),
regexp.MustCompile(`\\(x)([[:xdigit:]][^[:xdigit:]])`),
}
var transformRegExp_unescapeDollar = regexp.MustCompile(`\\([cux])$`)
// TODO Go "regexp" bug? Can't do: (?:)|(?:$)
func transformRegExp(ecmaRegExp string) (goRegExp string) {
// https://bugzilla.mozilla.org/show_bug.cgi/show_bug.cgi?id=334158
tmp := []byte(ecmaRegExp)
for _, value := range transformRegExp_unescape {
tmp = value.ReplaceAll(tmp, []byte(`$1$2`))
}
tmp = transformRegExp_escape_c.ReplaceAllFunc(tmp, func(in []byte) []byte {
in = bytes.ToUpper(in)
// in = [ \, c, A-Z ]
in[2] -= 64 // 64 => 01
return []byte(fmt.Sprintf("\\0%o", in[2]))
})
tmp = transformRegExp_unescape_c.ReplaceAll(tmp, []byte(`c`))
tmp = transformRegExp_unescapeDollar.ReplaceAll(tmp, []byte(`$1`))
tmp = transformRegExp_matchSlashU.ReplaceAll(tmp, []byte(`\x{$1}`))
return string(tmp)
}
func isValidRegExp(ecmaRegExp string) bool {
shibboleth := 0 // The shibboleth in this case is (?
// Since we're looking for (?! / (?=
inSet := false // In a bracketed set, e.g. [0-9]
escape := false
for _, chr := range ecmaRegExp {
if escape {
escape = false
shibboleth = 0
continue
}
if chr == '\\' {
escape = true
continue
}
if inSet {
if chr == ']' {
inSet = false
shibboleth = 0
}
continue
}
switch chr {
case '[':
inSet = true
continue
case '(':
shibboleth = 1
continue
case '?':
if shibboleth == 1 {
shibboleth = 2
}
continue
case '=', '!':
if shibboleth == 2 {
return false
}
}
shibboleth = 0
}
return true
}