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package otto
import (
"fmt"
"regexp"
"unicode/utf8"
"github.com/robertkrimen/otto/parser"
)
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 := ""
// TODO Maybe clean up the panicking here... TypeError, SyntaxError, ?
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, err := parser.TransformRegExp(pattern)
if err != nil {
panic(newTypeError("Invalid regular expression: %s", err.Error()))
}
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
}
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