package promql

import (
	"errors"
	"strconv"
)

// validateUnicodeEscape checks that the provided escape sequence is a
// valid Unicode escape sequence.
func validateUnicodeEscape(escape, errMsg string) (interface{}, error) {
	r, _, _, err := strconv.UnquoteChar("\\"+escape, '"')
	if err != nil {
		return nil, errors.New(errMsg)
	}
	if 0xD800 <= r && r <= 0xDFFF {
		return nil, errors.New(errMsg)
	}
	return nil, nil
}

var unicodeClasses = map[string]bool{
	"ASCII_Hex_Digit":                    true,
	"Arabic":                             true,
	"Armenian":                           true,
	"Avestan":                            true,
	"Balinese":                           true,
	"Bamum":                              true,
	"Bassa_Vah":                          true,
	"Batak":                              true,
	"Bengali":                            true,
	"Bidi_Control":                       true,
	"Bopomofo":                           true,
	"Brahmi":                             true,
	"Braille":                            true,
	"Buginese":                           true,
	"Buhid":                              true,
	"C":                                  true,
	"Canadian_Aboriginal":                true,
	"Carian":                             true,
	"Caucasian_Albanian":                 true,
	"Cc":                                 true,
	"Cf":                                 true,
	"Chakma":                             true,
	"Cham":                               true,
	"Cherokee":                           true,
	"Co":                                 true,
	"Common":                             true,
	"Coptic":                             true,
	"Cs":                                 true,
	"Cuneiform":                          true,
	"Cypriot":                            true,
	"Cyrillic":                           true,
	"Dash":                               true,
	"Deprecated":                         true,
	"Deseret":                            true,
	"Devanagari":                         true,
	"Diacritic":                          true,
	"Duployan":                           true,
	"Egyptian_Hieroglyphs":               true,
	"Elbasan":                            true,
	"Ethiopic":                           true,
	"Extender":                           true,
	"Georgian":                           true,
	"Glagolitic":                         true,
	"Gothic":                             true,
	"Grantha":                            true,
	"Greek":                              true,
	"Gujarati":                           true,
	"Gurmukhi":                           true,
	"Han":                                true,
	"Hangul":                             true,
	"Hanunoo":                            true,
	"Hebrew":                             true,
	"Hex_Digit":                          true,
	"Hiragana":                           true,
	"Hyphen":                             true,
	"IDS_Binary_Operator":                true,
	"IDS_Trinary_Operator":               true,
	"Ideographic":                        true,
	"Imperial_Aramaic":                   true,
	"Inherited":                          true,
	"Inscriptional_Pahlavi":              true,
	"Inscriptional_Parthian":             true,
	"Javanese":                           true,
	"Join_Control":                       true,
	"Kaithi":                             true,
	"Kannada":                            true,
	"Katakana":                           true,
	"Kayah_Li":                           true,
	"Kharoshthi":                         true,
	"Khmer":                              true,
	"Khojki":                             true,
	"Khudawadi":                          true,
	"L":                                  true,
	"Lao":                                true,
	"Latin":                              true,
	"Lepcha":                             true,
	"Limbu":                              true,
	"Linear_A":                           true,
	"Linear_B":                           true,
	"Lisu":                               true,
	"Ll":                                 true,
	"Lm":                                 true,
	"Lo":                                 true,
	"Logical_Order_Exception":            true,
	"Lt":                                 true,
	"Lu":                                 true,
	"Lycian":                             true,
	"Lydian":                             true,
	"M":                                  true,
	"Mahajani":                           true,
	"Malayalam":                          true,
	"Mandaic":                            true,
	"Manichaean":                         true,
	"Mc":                                 true,
	"Me":                                 true,
	"Meetei_Mayek":                       true,
	"Mende_Kikakui":                      true,
	"Meroitic_Cursive":                   true,
	"Meroitic_Hieroglyphs":               true,
	"Miao":                               true,
	"Mn":                                 true,
	"Modi":                               true,
	"Mongolian":                          true,
	"Mro":                                true,
	"Myanmar":                            true,
	"N":                                  true,
	"Nabataean":                          true,
	"Nd":                                 true,
	"New_Tai_Lue":                        true,
	"Nko":                                true,
	"Nl":                                 true,
	"No":                                 true,
	"Noncharacter_Code_Point":            true,
	"Ogham":                              true,
	"Ol_Chiki":                           true,
	"Old_Italic":                         true,
	"Old_North_Arabian":                  true,
	"Old_Permic":                         true,
	"Old_Persian":                        true,
	"Old_South_Arabian":                  true,
	"Old_Turkic":                         true,
	"Oriya":                              true,
	"Osmanya":                            true,
	"Other_Alphabetic":                   true,
	"Other_Default_Ignorable_Code_Point": true,
	"Other_Grapheme_Extend":              true,
	"Other_ID_Continue":                  true,
	"Other_ID_Start":                     true,
	"Other_Lowercase":                    true,
	"Other_Math":                         true,
	"Other_Uppercase":                    true,
	"P":                                  true,
	"Pahawh_Hmong":                       true,
	"Palmyrene":                          true,
	"Pattern_Syntax":                     true,
	"Pattern_White_Space":                true,
	"Pau_Cin_Hau":                        true,
	"Pc":                                 true,
	"Pd":                                 true,
	"Pe":                                 true,
	"Pf":                                 true,
	"Phags_Pa":                           true,
	"Phoenician":                         true,
	"Pi":                                 true,
	"Po":                                 true,
	"Ps":                                 true,
	"Psalter_Pahlavi":                    true,
	"Quotation_Mark":                     true,
	"Radical":                            true,
	"Rejang":                             true,
	"Runic":                              true,
	"S":                                  true,
	"STerm":                              true,
	"Samaritan":                          true,
	"Saurashtra":                         true,
	"Sc":                                 true,
	"Sharada":                            true,
	"Shavian":                            true,
	"Siddham":                            true,
	"Sinhala":                            true,
	"Sk":                                 true,
	"Sm":                                 true,
	"So":                                 true,
	"Soft_Dotted":                        true,
	"Sora_Sompeng":                       true,
	"Sundanese":                          true,
	"Syloti_Nagri":                       true,
	"Syriac":                             true,
	"Tagalog":                            true,
	"Tagbanwa":                           true,
	"Tai_Le":                             true,
	"Tai_Tham":                           true,
	"Tai_Viet":                           true,
	"Takri":                              true,
	"Tamil":                              true,
	"Telugu":                             true,
	"Terminal_Punctuation":               true,
	"Thaana":                             true,
	"Thai":                               true,
	"Tibetan":                            true,
	"Tifinagh":                           true,
	"Tirhuta":                            true,
	"Ugaritic":                           true,
	"Unified_Ideograph":                  true,
	"Vai":                                true,
	"Variation_Selector":                 true,
	"Warang_Citi":                        true,
	"White_Space":                        true,
	"Yi":                                 true,
	"Z":                                  true,
	"Zl":                                 true,
	"Zp":                                 true,
	"Zs":                                 true,
}