Function parseSteps

packs/step-parser/src/step-parser.ts:7–109

(
  inputSteps: {
    code: string;
    focus?: string;
    lang?: string;
    title?: string;
    subtitle?: string;
    showNumbers?: boolean;
  }[]
)

import { applyPatch } from "diff";

export function parseSteps(
  inputSteps: {
    code: string;
    focus?: string;
    lang?: string;
    title?: string;
    subtitle?: string;
    showNumbers?: boolean;
  }[]
) {
  if (inputSteps.length === 0) {
    return {
      tokens: [],
      types: [],
      steps: []
    };
  }

  const { lang, showNumbers = false } = inputSteps[0];

  if (!lang) {
    throw new Error("Missing code language");
  }

  const codeList = getCodeList(inputSteps);

  const { lineIds, steps } = linesDiff(codeList);
  const allTokens: string[][] = [];
  const allTypes: string[][] = [];
  const allSteps: {
    lines: number[];
    focus: Record<number, true | number[]>;
    focusCenter: number;
    focusCount: number;
    longestLineIndex: number;
    title?: string;
    subtitle?: string;
  }[] = [];

  steps.forEach((step, i) => {
    const code = codeList[i];
    const { tokens, types } = tokenize(code, lang);
    const lineKeys: number[] = [];
    step.forEach((lineId, lineIndex) => {
      const lineKey = lineIds.indexOf(lineId);
      allTokens[lineKey] = tokens[lineIndex];
      allTypes[lineKey] = types[lineIndex];
      lineKeys.push(lineKey);
    });

    const focusString = inputSteps[i].focus;
    const prevLineKeys = allSteps[i - 1] ? allSteps[i - 1].lines : [];
    const focus = focusString
      ? parseFocus(focusString)
      : getDefaultFocus(prevLineKeys, lineKeys);
    const { focusCenter, focusCount } = getFocusSize(focus);
    allSteps.push({
      lines: lineKeys,