react-native-advanced-input-mask/lib/module/web/helper/FormatSanitizer.js

Text input mask for React Native on iOS, Android and web. Synchronous and easy formatting without hustle

import FormatError from "./FormatError";
export default class FormatSanitizer {
  static sanitize(formatString) {
    FormatSanitizer.checkOpenBraces(formatString);
    const blocks = this.divideBlocksWithMixedCharacters(this.getFormatBlocks(formatString));
    return FormatSanitizer.sortFormatBlocks(blocks).join("");
  }
  static getFormatBlocks(formatString) {
    const blocks = [];
    let currentBlock = "";
    let escape = false;
    for (const char of formatString) {
      if (char === "\\") {
        if (!escape) {
          escape = true;
          currentBlock += char;
          continue;
        }
      }
      if ((char === "[" || char === "{") && !escape) {
        if (currentBlock.length > 0) {
          blocks.push(currentBlock);
        }
        currentBlock = "";
      }
      currentBlock += char;
      if ((char === "]" || char === "}") && !escape) {
        blocks.push(currentBlock);
        currentBlock = "";
      }
      escape = false;
    }
    if (currentBlock.length > 0) {
      blocks.push(currentBlock);
    }
    return blocks;
  }
  static divideBlocksWithMixedCharacters(blocks) {
    const resultingBlocks = [];
    for (const block of blocks) {
      if (block.startsWith("[")) {
        let blockBuffer = "";
        for (let i = 0; i < block.length; i++) {
          const blockCharacter = block[i];
          if (blockCharacter === "[") {
            blockBuffer += blockCharacter;
            continue;
          }
          if (blockCharacter === "]" && !blockBuffer.endsWith("\\")) {
            blockBuffer += blockCharacter;
            resultingBlocks.push(blockBuffer);
            break;
          }
          if ((blockCharacter === "0" || blockCharacter === "9") && (blockBuffer.includes("A") || blockBuffer.includes("a") || blockBuffer.includes("-") || blockBuffer.includes("_"))) {
            blockBuffer += "]";
            resultingBlocks.push(blockBuffer);
            blockBuffer = "[" + blockCharacter;
            continue;
          }
          if ((blockCharacter === "A" || blockCharacter === "a") && (blockBuffer.includes("0") || blockBuffer.includes("9") || blockBuffer.includes("-") || blockBuffer.includes("_"))) {
            blockBuffer += "]";
            resultingBlocks.push(blockBuffer);
            blockBuffer = "[" + blockCharacter;
            continue;
          }
          if ((blockCharacter === "-" || blockCharacter === "_") && (blockBuffer.includes("0") || blockBuffer.includes("9") || blockBuffer.includes("A") || blockBuffer.includes("a"))) {
            blockBuffer += "]";
            resultingBlocks.push(blockBuffer);
            blockBuffer = "[" + blockCharacter;
            continue;
          }
          blockBuffer += blockCharacter;
        }
      } else {
        resultingBlocks.push(block);
      }
    }
    return resultingBlocks;
  }
  static sortFormatBlocks(blocks) {
    const sortedBlocks = [];
    for (const block of blocks) {
      let sortedBlock;
      if (block.startsWith("[")) {
        if (block.includes("0") || block.includes("9") || block.includes("A") || block.includes("a")) {
          sortedBlock = "[" + block.replace("[", "").replace("]", "").split("").sort().join("") + "]";
        } else {
          // For `_` or `-`, temporarily replace for sorting
          sortedBlock = "[" + block.replace("[", "").replace("]", "").replace("_", "A").replace("-", "a").split("").sort().join("") + "]";
          sortedBlock = sortedBlock.replace("A", "_").replace("a", "-");
        }
      } else {
        sortedBlock = block;
      }
      sortedBlocks.push(sortedBlock);
    }
    return sortedBlocks;
  }
  static checkOpenBraces(str) {
    let escape = false;
    let squareBraceOpen = false;
    let curlyBraceOpen = false;
    for (const char of str) {
      if (char === "\\") {
        escape = !escape;
        continue;
      }
      if (char === "[") {
        if (squareBraceOpen) {
          throw new FormatError();
        }
        squareBraceOpen = !escape;
      }
      if (char === "]" && !escape) {
        squareBraceOpen = false;
      }
      if (char === "{") {
        if (curlyBraceOpen) {
          throw new FormatError();
        }
        curlyBraceOpen = !escape;
      }
      if (char === "}" && !escape) {
        curlyBraceOpen = false;
      }
      escape = false;
    }
  }
}
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