/**
 * Greek Isopsephy Computation Functions
 *
 * Provides computation functions for Greek isopsephy (ἰσοψηφία), the practice
 * of summing the numerical values of Greek letters.
 *
 * ## Systems Implemented
 *
 * | System | Greek Name | Method | Source |
 * |--------|------------|--------|--------|
 * | Standard | ἰσοψηφία | Milesian numerals (27 letters) | Gow 1883 |
 * | Ordinal | στοιχεῖα | Alphabet position (1-24) | Dionysius Thrax 2nd c. BCE |
 * | Reduced | πυθμήν | Digital root of standard | Hippolytus ~220 CE |
 *
 * ## Primary Sources (Public Domain)
 *
 * ### Standard Isopsephy (ἰσοψηφία)
 *
 * Gow, James. "The Greek Numerical Alphabet." *The Journal of Philology* 12
 *   (1883): 278–84.
 *
 * - Internet Archive: https://archive.org/details/journalofphilolo12claruoft
 *
 * ### Ordinal (στοιχεῖα)
 *
 * Dionysius Thrax. *Ars Grammatica* (Τέχνη Γραμματική). Section 6. 2nd century BCE.
 *   Edited by Gustav Uhlig. Leipzig: Teubner, 1883.
 *
 * - Internet Archive: https://archive.org/details/dionysiithracis00unkngoog
 * - Wikisource (English): https://en.wikisource.org/wiki/The_grammar_of_Dionysios_Thrax
 *
 * ### Reduced/Pythmen (πυθμήν)
 *
 * Hippolytus of Rome. *Refutation of All Heresies*. Book IV, Chapter 14 (~220 CE).
 *   Trans. J. H. MacMahon. In *Ante-Nicene Fathers*, vol. 5. Buffalo, NY:
 *   Christian Literature Publishing, 1886.
 *
 * - Internet Archive: https://archive.org/details/antenicenefathe00444gut
 * - Early Church Texts: https://www.earlychurchtexts.com/public/hippolytus_refutation_book4.htm
 * - New Advent: https://www.newadvent.org/fathers/050104.htm
 *
 * @module greek/isopsephy/compute
 */
import type { IsopsephyResult } from './types.js';
import { STANDARD, ORDINAL, ARCHAIC_LETTERS } from './systems.js';
export { STANDARD, ORDINAL, ARCHAIC_LETTERS };
/**
 * Check if text contains Greek characters.
 */
export declare function isGreek(text: string): boolean;
/**
 * Remove diacritical marks from Greek text.
 * Iota subscripts are first converted to adscripts so they count for isopsephy.
 */
export declare function removeDiacritics(text: string): string;
/**
 * Extract only Greek letters from text.
 */
export declare function extractGreekLetters(text: string): string;
/**
 * Count Greek words in text.
 */
export declare function countWords(text: string): number;
/**
 * Compute standard Greek isopsephy value (ἰσοψηφία).
 *
 * Uses the Milesian/Ionic numeral system with 27 letters:
 * - Units (1-9): α, β, γ, δ, ε, ϛ, ζ, η, θ
 * - Tens (10-90): ι, κ, λ, μ, ν, ξ, ο, π, ϟ
 * - Hundreds (100-900): ρ, σ, τ, υ, φ, χ, ψ, ω, ϡ
 *
 * Includes three archaic "episema" (ἐπίσημα): stigma (ϛ=6), koppa (ϟ=90),
 * and sampi (ϡ=900).
 *
 * Source: Gow, "The Greek Numerical Alphabet," *Journal of Philology* 12
 *   (1883): 278–284.
 */
export declare function computeStandard(text: string): number;
/**
 * Compute ordinal Greek value (alphabet position).
 *
 * Uses the standard 24-letter Greek alphabet (alpha to omega), numbered 1-24.
 * Archaic letters (stigma Ϛ/ϛ, koppa Ϟ/ϟ, sampi Ϡ/ϡ) have standard isopsephy
 * values but NO ordinal position in the alphabet.
 *
 * The Greek concept of ordered letters is explicit in Dionysius Thrax's
 * *Ars Grammatica* (2nd c. BCE), which states that letters are called
 * "stoicheia" (στοιχεῖα) because they have "order and arrangement" (στοῖχος
 * and τάξις). The alphabet was standardized in Athens in 403 BCE.
 *
 * Source: Dionysius Thrax, *Ars Grammatica*, Section 6 (2nd century BCE).
 *
 * @param text - The Greek text to calculate
 * @param strict - If true (default), throws an error when archaic letters are
 *   encountered. If false, silently skips archaic letters (treats them as 0).
 * @throws {Error} When archaic letters are detected and strict mode is enabled
 */
export declare function computeOrdinal(text: string, strict?: boolean): number;
/**
 * Compute reduced Greek value (πυθμήν / pythmen).
 *
 * Calculates the digital root of the standard isopsephy value, reducing it
 * to a single digit (1-9). The Pythagoreans called this the "πυθμήν" (pythmen),
 * meaning "root" or "base."
 *
 * The "Pythagoras to Telauges" (Πυθαγόρας πρὸς Τελαύγην) divination method
 * uses this reduction technique. It is attested in ~60 Byzantine manuscripts.
 *
 * Source: Hippolytus, *Refutation of All Heresies* IV.14 (~220 CE).
 */
export declare function computeReduced(text: string): number;
/**
 * Compute isopsephy with full result metadata.
 */
export declare function compute(text: string, system: 'standard' | 'ordinal' | 'reduced'): IsopsephyResult;
/**
 * Compute all isopsephy systems at once.
 */
export declare function computeAll(text: string): Record<string, number>;
/**
 * List all available system names.
 */
export declare function listSystems(): string[];
//# sourceMappingURL=compute.d.ts.map