RR0/rr0.org

import { DomReplacement } from '../../../../../../time/DomReplacement';
import { HtmlRR0SsgContext } from '../../../../../../RR0SsgContext';
import { CodeParser } from './CodeParser';

export class CodeReplacer implements DomReplacement<HtmlRR0SsgContext> {
  constructor(protected parsers: CodeParser[]) {
  }

  async replacement(context: HtmlRR0SsgContext, codeElement: HTMLElement): Promise<HTMLElement> {
    if (codeElement) {
      const output = context.file.document.createElement("code")
      const innerHTML = codeElement.innerHTML;
      const lines = innerHTML.split('\n');
      this.trimEnd(lines);
      this.removeIndent(lines);
      this.parse(lines);
      output.innerHTML = lines.join('\n');
      codeElement = output;
    }
    return codeElement;
  }

  protected removeIndent(lines: string[]) {
    let minIndent = Number.MAX_VALUE;
    for (const line of lines) {
      if (line.length > 0) {
        let i = 0;
        while (line.charAt(i) === ' ') i++;
        if (i < minIndent) {
          minIndent = i;
        }
      }
    }
    for (let i = 0; i < lines.length; i++) {
      const line = lines[i];
      lines[i] = line.substring(minIndent);
    }
  }

  protected trimEnd(lines: string[]) {
    for (let i = 0; i < lines.length; i++) {
      const line = lines[i];
      lines[i] = line.trimEnd();
    }
  }

  protected parse(lines: string[]) {
    for (const parser of this.parsers) {
      parser.parse(lines);
    }
  }
}