lure-updater/internal/builtins/regex.go

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2023-06-09 17:54:15 +00:00
/*
* LURE Updater - Automated updater bot for LURE packages
* Copyright (C) 2023 Elara Musayelyan
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
2023-06-09 17:48:46 +00:00
package builtins
import (
"sync"
"go.elara.ws/pcre"
"go.starlark.net/starlark"
"go.starlark.net/starlarkstruct"
)
var (
cacheMtx = &sync.Mutex{}
regexCache = map[string]*pcre.Regexp{}
)
var regexModule = &starlarkstruct.Module{
Name: "regex",
Members: starlark.StringDict{
"compile": starlark.NewBuiltin("regex.compile", regexCompile),
"compile_glob": starlark.NewBuiltin("regex.compile_glob", regexCompileGlob),
},
}
func regexCompile(thread *starlark.Thread, b *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
var regexStr string
err := starlark.UnpackArgs("regex.compile", args, kwargs, "regex", &regexStr)
if err != nil {
return nil, err
}
cacheMtx.Lock()
regex, ok := regexCache[regexStr]
if !ok {
regex, err = pcre.Compile(regexStr)
if err != nil {
return nil, err
}
regexCache[regexStr] = regex
}
cacheMtx.Unlock()
return starlarkRegex(regex), nil
}
func regexCompileGlob(thread *starlark.Thread, b *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
var globStr string
err := starlark.UnpackArgs("regex.compile_glob", args, kwargs, "glob", &globStr)
if err != nil {
return nil, err
}
cacheMtx.Lock()
regex, ok := regexCache[globStr]
if !ok {
regex, err = pcre.CompileGlob(globStr)
if err != nil {
return nil, err
}
regexCache[globStr] = regex
}
cacheMtx.Unlock()
return starlarkRegex(regex), nil
}
func starlarkRegex(regex *pcre.Regexp) *starlarkstruct.Struct {
return starlarkstruct.FromStringDict(starlarkstruct.Default, starlark.StringDict{
"find_all": findAll(regex),
"find_one": findOne(regex),
"matches": matches(regex),
})
}
func findAll(regex *pcre.Regexp) *starlark.Builtin {
return starlark.NewBuiltin("regex.regexp.find_all", func(thread *starlark.Thread, fn *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
var in string
err := starlark.UnpackArgs("regex.compile", args, kwargs, "in", &in)
if err != nil {
return nil, err
}
matches := regex.FindAllStringSubmatch(in, -1)
return matchesToStarlark2D(matches), nil
})
}
func findOne(regex *pcre.Regexp) *starlark.Builtin {
return starlark.NewBuiltin("regex.regexp.find_one", func(thread *starlark.Thread, fn *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
var in string
err := starlark.UnpackArgs("regex.compile", args, kwargs, "in", &in)
if err != nil {
return nil, err
}
match := regex.FindStringSubmatch(in)
return matchesToStarlark1D(match), nil
})
}
func matches(regex *pcre.Regexp) *starlark.Builtin {
return starlark.NewBuiltin("regex.regexp.find_one", func(thread *starlark.Thread, fn *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
var in string
err := starlark.UnpackArgs("regex.compile", args, kwargs, "in", &in)
if err != nil {
return nil, err
}
found := regex.MatchString(in)
return starlark.Bool(found), nil
})
}
func matchesToStarlark2D(matches [][]string) *starlark.List {
outer := make([]starlark.Value, len(matches))
for i, match := range matches {
outer[i] = matchesToStarlark1D(match)
}
return starlark.NewList(outer)
}
func matchesToStarlark1D(match []string) *starlark.List {
list := make([]starlark.Value, len(match))
for j, val := range match {
list[j] = starlark.String(val)
}
return starlark.NewList(list)
}