⭐ add unicode resources to core (#7157)

* ⭐ add unicode resources to core

* 🟢 feedback

Author: arlimus

providers/core/resources/classifier/unicode.go

@@ -0,0 +1,227 @@
+// Copyright Mondoo, Inc. 2024, 2026
+// SPDX-License-Identifier: BUSL-1.1
+
+package classifier
+
+import (
+	"errors"
+	"fmt"
+	"unicode"
+	"unicode/utf8"
+)
+
+// CategoryDescriptions maps Unicode general category codes to their descriptions
+var CategoryDescriptions = map[string]string{
+	// Letter categories
+	"Lu": "Letter, Uppercase",
+	"Ll": "Letter, Lowercase",
+	"Lt": "Letter, Titlecase",
+	"Lm": "Letter, Modifier",
+	"Lo": "Letter, Other",
+
+	// Mark categories
+	"Mn": "Mark, Nonspacing",
+	"Mc": "Mark, Spacing Combining",
+	"Me": "Mark, Enclosing",
+
+	// Number categories
+	"Nd": "Number, Decimal Digit",
+	"Nl": "Number, Letter",
+	"No": "Number, Other",
+
+	// Punctuation categories
+	"Pc": "Punctuation, Connector",
+	"Pd": "Punctuation, Dash",
+	"Ps": "Punctuation, Open",
+	"Pe": "Punctuation, Close",
+	"Pi": "Punctuation, Initial quote",
+	"Pf": "Punctuation, Final quote",
+	"Po": "Punctuation, Other",
+
+	// Symbol categories
+	"Sm": "Symbol, Math",
+	"Sc": "Symbol, Currency",
+	"Sk": "Symbol, Modifier",
+	"So": "Symbol, Other",
+
+	// Separator categories
+	"Zs": "Separator, Space",
+	"Zl": "Separator, Line",
+	"Zp": "Separator, Paragraph",
+
+	// Control categories
+	"Cc": "Control",
+	"Cf": "Format",
+	"Cs": "Surrogate",
+	"Co": "Private Use",
+	"Cn": "Unassigned",
+}
+
+// CharacterInfo represents detailed information about a Unicode character
+type CharacterInfo struct {
+	// Position is the zero-based index of the character in the original string
+	Position int `json:"position"`
+
+	// Character is the actual Unicode character as a string
+	Character string `json:"character"`
+
+	// UnicodePoint is the Unicode code point in U+XXXX format
+	UnicodePoint string `json:"unicodePoint"`
+
+	// MajorCategory is the major Unicode category (single letter)
+	MajorCategory string `json:"majorCategory"`
+
+	// Category is the Unicode general category code (two-letter code)
+	Category string `json:"category"`
+
+	// Description is the human-readable description of the category
+	Description string `json:"description"`
+
+	// Rune is the raw Go rune (int32) value of the character
+	Rune rune `json:"rune"`
+}
+
+// UnicodeClassifier provides Unicode character classification functionality
+type UnicodeClassifier struct{}
+
+// NewUnicodeClassifier creates a new Unicode classifier instance
+func NewUnicodeClassifier() *UnicodeClassifier {
+	return &UnicodeClassifier{}
+}
+
+// validateUTF8 is a helper function to validate UTF-8 strings
+func validateUTF8(text string) error {
+	if !utf8.ValidString(text) {
+		return errors.New("invalid UTF-8 string")
+	}
+	return nil
+}
+
+// formatUnicodePoint efficiently formats a rune as a Unicode code point
+func formatUnicodePoint(r rune) string {
+	return fmt.Sprintf("U+%04X", r)
+}
+
+// getUnicodeCategory determines the Unicode general category for a rune
+// see https://en.wikipedia.org/wiki/Unicode_character_property#General_Category
+func (c *UnicodeClassifier) getUnicodeCategory(r rune) string {
+	switch {
+	case unicode.IsUpper(r):
+		return "Lu"
+	case unicode.IsLower(r):
+		return "Ll"
+	case unicode.IsTitle(r):
+		return "Lt"
+	case unicode.In(r, unicode.Lm):
+		return "Lm"
+	case unicode.IsLetter(r):
+		return "Lo"
+	case unicode.In(r, unicode.Mn):
+		return "Mn"
+	case unicode.In(r, unicode.Mc):
+		return "Mc"
+	case unicode.In(r, unicode.Me):
+		return "Me"
+	case unicode.IsDigit(r):
+		return "Nd"
+	case unicode.In(r, unicode.Nl):
+		return "Nl"
+	case unicode.IsNumber(r):
+		return "No"
+	case unicode.In(r, unicode.Pc):
+		return "Pc"
+	case unicode.In(r, unicode.Pd):
+		return "Pd"
+	case unicode.In(r, unicode.Ps):
+		return "Ps"
+	case unicode.In(r, unicode.Pe):
+		return "Pe"
+	case unicode.In(r, unicode.Pi):
+		return "Pi"
+	case unicode.In(r, unicode.Pf):
+		return "Pf"
+	case unicode.IsPunct(r):
+		return "Po"
+	case unicode.In(r, unicode.Sm):
+		return "Sm"
+	case unicode.In(r, unicode.Sc):
+		return "Sc"
+	case unicode.In(r, unicode.Sk):
+		return "Sk"
+	case unicode.IsSymbol(r):
+		return "So"
+	case unicode.In(r, unicode.Zs):
+		return "Zs"
+	case unicode.In(r, unicode.Zl):
+		return "Zl"
+	case unicode.In(r, unicode.Zp):
+		return "Zp"
+	case unicode.IsControl(r):
+		return "Cc"
+	case unicode.In(r, unicode.Cf):
+		return "Cf"
+	case unicode.In(r, unicode.Cs):
+		return "Cs"
+	case unicode.In(r, unicode.Co):
+		return "Co"
+	default:
+		return "Cn"
+	}
+}
+
+// ClassifyRune classifies a single rune and returns its category and description
+func (c *UnicodeClassifier) ClassifyRune(r rune) (category, description string) {
+	category = c.getUnicodeCategory(r)
+	if desc, exists := CategoryDescriptions[category]; exists {
+		description = desc
+	} else {
+		description = "Unknown category"
+	}
+	return
+}
+
+// ClassifyString analyzes all characters in a string and returns detailed information
+func (c *UnicodeClassifier) ClassifyString(text string) ([]CharacterInfo, error) {
+	if err := validateUTF8(text); err != nil {
+		return nil, err
+	}
+
+	runeCount := utf8.RuneCountInString(text)
+	results := make([]CharacterInfo, 0, runeCount)
+
+	position := 0
+	for _, r := range text {
+		category, description := c.ClassifyRune(r)
+
+		info := CharacterInfo{
+			Position:      position,
+			Character:     string(r),
+			UnicodePoint:  formatUnicodePoint(r),
+			MajorCategory: string(category[0]),
+			Category:      category,
+			Description:   description,
+			Rune:          r,
+		}
+
+		results = append(results, info)
+		position++
+	}
+
+	return results, nil
+}
+
+// GetCategorySummary returns a count of each Unicode category in the text
+func (c *UnicodeClassifier) GetCategorySummary(text string) (map[string]int, error) {
+	if err := validateUTF8(text); err != nil {
+		return nil, err
+	}
+
+	categoryCounts := make(map[string]int)
+
+	for _, r := range text {
+		category := c.getUnicodeCategory(r)
+		categoryCounts[category]++
+	}
+
+	return categoryCounts, nil
+}