128 lines
3.4 KiB
Go
128 lines
3.4 KiB
Go
package builtins
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import (
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"sync"
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"go.elara.ws/pcre"
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"go.starlark.net/starlark"
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"go.starlark.net/starlarkstruct"
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)
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var (
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cacheMtx = &sync.Mutex{}
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regexCache = map[string]*pcre.Regexp{}
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)
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var regexModule = &starlarkstruct.Module{
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Name: "regex",
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Members: starlark.StringDict{
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"compile": starlark.NewBuiltin("regex.compile", regexCompile),
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"compile_glob": starlark.NewBuiltin("regex.compile_glob", regexCompileGlob),
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},
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}
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func regexCompile(thread *starlark.Thread, b *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
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var regexStr string
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err := starlark.UnpackArgs("regex.compile", args, kwargs, "regex", ®exStr)
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if err != nil {
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return nil, err
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}
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cacheMtx.Lock()
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regex, ok := regexCache[regexStr]
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if !ok {
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regex, err = pcre.Compile(regexStr)
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if err != nil {
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return nil, err
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}
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regexCache[regexStr] = regex
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}
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cacheMtx.Unlock()
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return starlarkRegex(regex), nil
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}
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func regexCompileGlob(thread *starlark.Thread, b *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
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var globStr string
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err := starlark.UnpackArgs("regex.compile_glob", args, kwargs, "glob", &globStr)
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if err != nil {
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return nil, err
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}
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cacheMtx.Lock()
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regex, ok := regexCache[globStr]
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if !ok {
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regex, err = pcre.CompileGlob(globStr)
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if err != nil {
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return nil, err
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}
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regexCache[globStr] = regex
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}
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cacheMtx.Unlock()
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return starlarkRegex(regex), nil
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}
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func starlarkRegex(regex *pcre.Regexp) *starlarkstruct.Struct {
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return starlarkstruct.FromStringDict(starlarkstruct.Default, starlark.StringDict{
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"find_all": findAll(regex),
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"find_one": findOne(regex),
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"matches": matches(regex),
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})
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}
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func findAll(regex *pcre.Regexp) *starlark.Builtin {
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return starlark.NewBuiltin("regex.regexp.find_all", func(thread *starlark.Thread, fn *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
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var in string
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err := starlark.UnpackArgs("regex.compile", args, kwargs, "in", &in)
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if err != nil {
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return nil, err
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}
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matches := regex.FindAllStringSubmatch(in, -1)
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return matchesToStarlark2D(matches), nil
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})
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}
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func findOne(regex *pcre.Regexp) *starlark.Builtin {
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return starlark.NewBuiltin("regex.regexp.find_one", func(thread *starlark.Thread, fn *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
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var in string
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err := starlark.UnpackArgs("regex.compile", args, kwargs, "in", &in)
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if err != nil {
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return nil, err
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}
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match := regex.FindStringSubmatch(in)
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return matchesToStarlark1D(match), nil
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})
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}
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func matches(regex *pcre.Regexp) *starlark.Builtin {
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return starlark.NewBuiltin("regex.regexp.find_one", func(thread *starlark.Thread, fn *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
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var in string
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err := starlark.UnpackArgs("regex.compile", args, kwargs, "in", &in)
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if err != nil {
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return nil, err
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}
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found := regex.MatchString(in)
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return starlark.Bool(found), nil
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})
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}
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func matchesToStarlark2D(matches [][]string) *starlark.List {
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outer := make([]starlark.Value, len(matches))
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for i, match := range matches {
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outer[i] = matchesToStarlark1D(match)
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}
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return starlark.NewList(outer)
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}
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func matchesToStarlark1D(match []string) *starlark.List {
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list := make([]starlark.Value, len(match))
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for j, val := range match {
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list[j] = starlark.String(val)
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}
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return starlark.NewList(list)
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}
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