"use strict";

exports.BlockValue = exports.Chomp = void 0;

var _constants = require("../constants");

var _Node = require("./Node");

var _Range = require("./Range");

const Chomp = {
  CLIP: 'CLIP',
  KEEP: 'KEEP',
  STRIP: 'STRIP'
};
exports.Chomp = Chomp;

class BlockValue extends _Node.Node {
  constructor(type, props) {
    super(type, props);
    this.blockIndent = null;
    this.chomping = Chomp.CLIP;
    this.header = null;
  }

  get includesTrailingLines() {
    return this.chomping === Chomp.KEEP;
  }

  get strValue() {
    if (!this.valueRange || !this.context) return null;
    let {
      start,
      end
    } = this.valueRange;
    const {
      indent,
      src
    } = this.context;
    if (this.valueRange.isEmpty()) return '';
    let lastNewLine = null;
    let ch = src[end - 1];

    while (ch === '\n' || ch === '\t' || ch === ' ') {
      end -= 1;

      if (end <= start) {
        if (this.chomping === Chomp.KEEP) break;else return ''; // probably never happens
      }

      if (ch === '\n') lastNewLine = end;
      ch = src[end - 1];
    }

    let keepStart = end + 1;

    if (lastNewLine) {
      if (this.chomping === Chomp.KEEP) {
        keepStart = lastNewLine;
        end = this.valueRange.end;
      } else {
        end = lastNewLine;
      }
    }

    const bi = indent + this.blockIndent;
    const folded = this.type === _constants.Type.BLOCK_FOLDED;
    let atStart = true;
    let str = '';
    let sep = '';
    let prevMoreIndented = false;

    for (let i = start; i < end; ++i) {
      for (let j = 0; j < bi; ++j) {
        if (src[i] !== ' ') break;
        i += 1;
      }

      const ch = src[i];

      if (ch === '\n') {
        if (sep === '\n') str += '\n';else sep = '\n';
      } else {
        const lineEnd = _Node.Node.endOfLine(src, i);

        const line = src.slice(i, lineEnd);
        i = lineEnd;

        if (folded && (ch === ' ' || ch === '\t') && i < keepStart) {
          if (sep === ' ') sep = '\n';else if (!prevMoreIndented && !atStart && sep === '\n') sep = '\n\n';
          str += sep + line; //+ ((lineEnd < end && src[lineEnd]) || '')

          sep = lineEnd < end && src[lineEnd] || '';
          prevMoreIndented = true;
        } else {
          str += sep + line;
          sep = folded && i < keepStart ? ' ' : '\n';
          prevMoreIndented = false;
        }

        if (atStart && line !== '') atStart = false;
      }
    }

    return this.chomping === Chomp.STRIP ? str : str + '\n';
  }

  parseBlockHeader(start) {
    const {
      src
    } = this.context;
    let offset = start + 1;
    let bi = '';

    while (true) {
      const ch = src[offset];

      switch (ch) {
        case '-':
          this.chomping = Chomp.STRIP;
          break;

        case '+':
          this.chomping = Chomp.KEEP;
          break;

        case '0':
        case '1':
        case '2':
        case '3':
        case '4':
        case '5':
        case '6':
        case '7':
        case '8':
        case '9':
          bi += ch;
          break;

        default:
          this.blockIndent = Number(bi) || null;
          this.header = new _Range.Range(start, offset);
          return offset;
      }

      offset += 1;
    }
  }

  parseBlockValue(start) {
    const {
      indent,
      src
    } = this.context;
    let offset = start;
    let valueEnd = start;
    let bi = this.blockIndent ? indent + this.blockIndent - 1 : indent;
    let minBlockIndent = 1;

    for (let ch = src[offset]; ch === '\n'; ch = src[offset]) {
      offset += 1;
      if (_Node.Node.atDocumentBoundary(src, offset)) break;

      const end = _Node.Node.endOfBlockIndent(src, bi, offset); // should not include tab?


      if (end === null) break;

      if (!this.blockIndent) {
        // no explicit block indent, none yet detected
        const lineIndent = end - (offset + indent);

        if (src[end] !== '\n') {
          // first line with non-whitespace content
          if (lineIndent < minBlockIndent) {
            offset -= 1;
            break;
          }

          this.blockIndent = lineIndent;
          bi = indent + this.blockIndent - 1;
        } else if (lineIndent > minBlockIndent) {
          // empty line with more whitespace
          minBlockIndent = lineIndent;
        }
      }

      if (src[end] === '\n') {
        offset = end;
      } else {
        offset = valueEnd = _Node.Node.endOfLine(src, end);
      }
    }

    if (this.chomping !== Chomp.KEEP) {
      offset = src[valueEnd] ? valueEnd + 1 : valueEnd;
    }

    this.valueRange = new _Range.Range(start + 1, offset);
    return offset;
  }
  /**
   * Parses a block value from the source
   *
   * Accepted forms are:
   * ```
   * BS
   * block
   * lines
   *
   * BS #comment
   * block
   * lines
   * ```
   * where the block style BS matches the regexp `[|>][-+1-9]*` and block lines
   * are empty or have an indent level greater than `indent`.
   *
   * @param {ParseContext} context
   * @param {number} start - Index of first character
   * @returns {number} - Index of the character after this block
   */


  parse(context, start) {
    this.context = context;
    const {
      src
    } = context;
    let offset = this.parseBlockHeader(start);
    offset = _Node.Node.endOfWhiteSpace(src, offset);
    offset = this.parseComment(offset);
    offset = this.parseBlockValue(offset);
    return offset;
  }

  setOrigRanges(cr, offset) {
    offset = super.setOrigRanges(cr, offset);
    return this.header ? this.header.setOrigRange(cr, offset) : offset;
  }

}

exports.BlockValue = BlockValue;