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regex.go
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regex.go
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package builtin_libs
import (
"regexp"
"unicode/utf8"
. "github.com/zgg-lang/zgg-go/runtime"
)
func regexStrRunes(s string, begin, end int) int64 {
return int64(utf8.RuneCountInString(s[begin:end]))
}
func regexMakeMatchGroupArray(c *Context, s string, begin, end int) Value {
if begin < 0 || end < begin {
return NewArrayByValues(NewStr(""), NewInt(-1), NewInt(-1))
}
oBegin := regexStrRunes(s, 0, begin)
oEnd := oBegin + regexStrRunes(s, begin, end)
return NewArrayByValues(
NewStr(s[begin:end]),
NewInt(oBegin),
NewInt(oEnd),
)
}
func regexMakeMatchGroupObject(c *Context, s string, begin, end int) Value {
rv := NewObject()
if begin < 0 || end < begin {
rv.SetMember("text", NewStr(""), c)
rv.SetMember("begin", NewInt(-1), c)
rv.SetMember("end", NewInt(-1), c)
} else {
oBegin := regexStrRunes(s, 0, begin)
oEnd := oBegin + regexStrRunes(s, begin, end)
rv.SetMember("text", NewStr(s[begin:end]), c)
rv.SetMember("begin", NewInt(oBegin), c)
rv.SetMember("end", NewInt(oEnd), c)
}
return rv
}
func libRegexInner(c *Context, libName string, regexMakeMatchGroup func(*Context, string, int, int) Value) ValueObject {
lib := NewObject()
cls := buildRegexpClass(regexMakeMatchGroup)
lib.SetMember("Regexp", cls, nil)
lib.SetMember("findAll", NewNativeFunction("findAll", func(c *Context, this Value, args []Value) Value {
var (
pattern ValueStr
text ValueStr
)
EnsureFuncParams(c, libName+".findAll", args,
ArgRuleRequired("pattern", TypeStr, &pattern),
ArgRuleRequired("text", TypeStr, &text),
)
re := NewObjectAndInit(cls, c, pattern)
return c.InvokeMethod(re, "findAll", Args(args[1:]...))
}, "pattern", "text"), nil)
lib.SetMember("find", NewNativeFunction("find", func(c *Context, this Value, args []Value) Value {
var (
pattern ValueStr
text ValueStr
offset ValueInt
)
EnsureFuncParams(c, libName+".find", args,
ArgRuleRequired("pattern", TypeStr, &pattern),
ArgRuleRequired("text", TypeStr, &text),
ArgRuleOptional("offset", TypeInt, &offset, NewInt(0)),
)
re := NewObjectAndInit(cls, c, pattern)
return c.InvokeMethod(re, "find", Args(args[1:]...))
}, "pattern", "text", "offset"), nil)
lib.SetMember("split", NewNativeFunction("split", func(c *Context, this Value, args []Value) Value {
var (
pattern ValueStr
text ValueStr
)
EnsureFuncParams(c, libName+".split", args,
ArgRuleRequired("pattern", TypeStr, &pattern),
ArgRuleRequired("text", TypeStr, &text),
)
re := NewObjectAndInit(cls, c, pattern)
return c.InvokeMethod(re, "split", Args(args[1:]...))
}, "pattern", "text"), nil)
lib.SetMember("replaceAll", NewNativeFunction("replaceAll", func(c *Context, this Value, args []Value) Value {
var (
pattern ValueStr
src ValueStr
repl Value
)
EnsureFuncParams(c, libName+".replaceAll", args,
ArgRuleRequired("pattern", TypeStr, &pattern),
ArgRuleRequired("src", TypeStr, &src),
ArgRuleRequired("repl", TypeAny, &repl),
)
re := NewObjectAndInit(cls, c, pattern)
return c.InvokeMethod(re, "replaceAll", Args(args[1:]...))
}, "pattern", "src", "repl"), nil)
return lib
}
func libRegex(c *Context) ValueObject {
return libRegexInner(c, "regex", regexMakeMatchGroupArray)
}
func libRegex2(c *Context) ValueObject {
return libRegexInner(c, "regex2", regexMakeMatchGroupObject)
}
func buildRegexpClass(regexMakeMatchGroup func(*Context, string, int, int) Value) ValueType {
return NewClassBuilder("Regexp").
Constructor(func(c *Context, this ValueObject, args []Value) {
var p ValueStr
EnsureFuncParams(c, "Regexp.__init__", args, ArgRuleRequired("pattern", TypeStr, &p))
re, err := regexp.Compile(p.Value())
if err != nil {
c.RaiseRuntimeError("compile regexp %s error %+v", p.Value(), err)
}
this.Reserved = re
}).
Method("find", func(c *Context, this ValueObject, args []Value) Value {
var (
text ValueStr
offset ValueInt
)
EnsureFuncParams(c, "Regexp.find", args,
ArgRuleRequired("text", TypeStr, &text),
ArgRuleOptional("offset", TypeInt, &offset, NewInt(0)),
)
re := this.Reserved.(*regexp.Regexp)
n := offset.AsInt()
runes := text.Runes()
if n >= len(runes) || n < -len(runes) {
return NewArray(0)
}
if n < 0 {
n += len(runes)
}
s := text.Value()
if n > 0 {
nInBytes := 0
for i := 0; i < n; i++ {
nInBytes += utf8.RuneLen(runes[i])
}
n = nInBytes
}
rv := re.FindStringSubmatchIndex(s[n:])
if rv == nil {
return NewArray(0)
}
rvItem := NewArray(len(rv) / 2)
for i := 0; i < len(rv); i += 2 {
begin, end := rv[i]+n, rv[i+1]+n
rvItem.PushBack(regexMakeMatchGroup(c, s, begin, end))
}
return rvItem
}, "text", "offset").
Method("findAll", func(c *Context, this ValueObject, args []Value) Value {
var text ValueStr
EnsureFuncParams(c, "Regexp.findAll", args,
ArgRuleRequired("text", TypeStr, &text),
)
re := this.Reserved.(*regexp.Regexp)
s := text.Value()
rv := re.FindAllStringSubmatchIndex(s, -1)
if rv == nil {
return NewArray(0)
}
rvArr := NewArray(len(rv))
for _, rs := range rv {
rvItem := NewArray(len(rs) / 2)
for i := 0; i < len(rs); i += 2 {
begin, end := rs[i], rs[i+1]
rvItem.PushBack(regexMakeMatchGroup(c, s, begin, end))
}
rvArr.PushBack(rvItem)
}
return rvArr
}, "text").
Method("split", func(c *Context, this ValueObject, args []Value) Value {
var (
text ValueStr
n ValueInt
)
EnsureFuncParams(c, "Regexp.split", args,
ArgRuleRequired("text", TypeStr, &text),
ArgRuleOptional("n", TypeInt, &n, NewInt(-1)),
)
var (
re = this.Reserved.(*regexp.Regexp)
subs = re.Split(text.Value(), n.AsInt())
rv = NewArray(len(subs))
)
for _, sub := range subs {
rv.PushBack(NewStr(sub))
}
return rv
}, "text").
Method("replaceAll", func(c *Context, this ValueObject, args []Value) Value {
var (
src ValueStr
replStr ValueStr
replFunc ValueCallable
replWhich int
)
EnsureFuncParams(c, "Regexp.replaceAll", args,
ArgRuleRequired("src", TypeStr, &src),
ArgRuleOneOf("repl",
[]ValueType{TypeStr, TypeCallable},
[]any{&replStr, &replFunc},
&replWhich, nil, nil,
),
)
p := this.Reserved.(*regexp.Regexp)
if replWhich == 1 {
return NewStr(p.ReplaceAllStringFunc(src.Value(), func(s string) string {
c.Invoke(replFunc, nil, Args(NewStr(s)))
return c.RetVal.ToString(c)
}))
} else {
return NewStr(p.ReplaceAllString(src.Value(), replStr.Value()))
}
}, "src", "repl").
Build()
}