@silvana-one/nft/dist/node/metadata/text.js

Mina NFT library

import { MerkleTree, Field } from "o1js";
export { Text, TEXT_TREE_HEIGHT };
/**
 * The default height of the Merkle tree used to represent the text data.
 */
const TEXT_TREE_HEIGHT = 20;
/**
 * The `Text` class represents textual data in the form of a Merkle tree. Each character of the text is converted to its
 * ASCII code and stored as a leaf in the Merkle tree. The root of the tree can be used as a compact representation
 * of the text data in cryptographic proofs.
 */
class Text {
    /**
     * Constructs a new `Text` instance by creating a Merkle tree from the given text string.
     * Each character in the text is converted to its ASCII code and stored as a leaf in the tree.
     *
     * @param text - The text string to be represented.
     * @param height - The height of the Merkle tree. Defaults to `TEXT_TREE_HEIGHT`.
     * @throws Will throw an error if the text length exceeds the number of leaves in the Merkle tree.
     */
    constructor(text, height = TEXT_TREE_HEIGHT) {
        this.text = text;
        this.size = text.length;
        const tree = new MerkleTree(height);
        if (this.size > tree.leafCount)
            throw new Error(`Text is too long`);
        for (let i = 0; i < this.size; i++) {
            tree.setLeaf(BigInt(i), Field.from(this.text.charCodeAt(i)));
        }
        this.root = tree.getRoot();
        this.height = height;
    }
    /**
     * Returns the original text string.
     *
     * @returns The text string.
     */
    toString() {
        return this.text;
    }
}
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