YueWen/node_modules/@babel/generator/lib/buffer.js

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;
class Buffer {
  constructor(map) {
    this._map = null;
    this._buf = "";
    this._str = "";
    this._appendCount = 0;
    this._last = 0;
    this._queue = [];
    this._queueCursor = 0;
    this._canMarkIdName = true;
    this._position = {
      line: 1,
      column: 0
    };
    this._sourcePosition = {
      identifierName: undefined,
      identifierNamePos: undefined,
      line: undefined,
      column: undefined,
      filename: undefined
    };
    this._map = map;
    this._allocQueue();
  }
  _allocQueue() {
    const queue = this._queue;
    for (let i = 0; i < 16; i++) {
      queue.push({
        char: 0,
        repeat: 1,
        line: undefined,
        column: undefined,
        identifierName: undefined,
        identifierNamePos: undefined,
        filename: ""
      });
    }
  }
  _pushQueue(char, repeat, line, column, filename) {
    const cursor = this._queueCursor;
    if (cursor === this._queue.length) {
      this._allocQueue();
    }
    const item = this._queue[cursor];
    item.char = char;
    item.repeat = repeat;
    item.line = line;
    item.column = column;
    item.filename = filename;
    this._queueCursor++;
  }
  _popQueue() {
    if (this._queueCursor === 0) {
      throw new Error("Cannot pop from empty queue");
    }
    return this._queue[--this._queueCursor];
  }
  get() {
    this._flush();
    const map = this._map;
    const result = {
      code: (this._buf + this._str).trimRight(),
      decodedMap: map == null ? void 0 : map.getDecoded(),
      get __mergedMap() {
        return this.map;
      },
      get map() {
        const resultMap = map ? map.get() : null;
        result.map = resultMap;
        return resultMap;
      },
      set map(value) {
        Object.defineProperty(result, "map", {
          value,
          writable: true
        });
      },
      get rawMappings() {
        const mappings = map == null ? void 0 : map.getRawMappings();
        result.rawMappings = mappings;
        return mappings;
      },
      set rawMappings(value) {
        Object.defineProperty(result, "rawMappings", {
          value,
          writable: true
        });
      }
    };
    return result;
  }
  append(str, maybeNewline) {
    this._flush();
    this._append(str, this._sourcePosition, maybeNewline);
  }
  appendChar(char) {
    this._flush();
    this._appendChar(char, 1, this._sourcePosition);
  }
  queue(char) {
    if (char === 10) {
      while (this._queueCursor !== 0) {
        const char = this._queue[this._queueCursor - 1].char;
        if (char !== 32 && char !== 9) {
          break;
        }
        this._queueCursor--;
      }
    }
    const sourcePosition = this._sourcePosition;
    this._pushQueue(char, 1, sourcePosition.line, sourcePosition.column, sourcePosition.filename);
  }
  queueIndentation(char, repeat) {
    this._pushQueue(char, repeat, undefined, undefined, undefined);
  }
  _flush() {
    const queueCursor = this._queueCursor;
    const queue = this._queue;
    for (let i = 0; i < queueCursor; i++) {
      const item = queue[i];
      this._appendChar(item.char, item.repeat, item);
    }
    this._queueCursor = 0;
  }
  _appendChar(char, repeat, sourcePos) {
    this._last = char;
    this._str += repeat > 1 ? String.fromCharCode(char).repeat(repeat) : String.fromCharCode(char);
    if (char !== 10) {
      this._mark(sourcePos.line, sourcePos.column, sourcePos.identifierName, sourcePos.identifierNamePos, sourcePos.filename);
      this._position.column += repeat;
    } else {
      this._position.line++;
      this._position.column = 0;
    }
    if (this._canMarkIdName) {
      sourcePos.identifierName = undefined;
      sourcePos.identifierNamePos = undefined;
    }
  }
  _append(str, sourcePos, maybeNewline) {
    const len = str.length;
    const position = this._position;
    this._last = str.charCodeAt(len - 1);
    if (++this._appendCount > 4096) {
      +this._str;
      this._buf += this._str;
      this._str = str;
      this._appendCount = 0;
    } else {
      this._str += str;
    }
    if (!maybeNewline && !this._map) {
      position.column += len;
      return;
    }
    const {
      column,
      identifierName,
      identifierNamePos,
      filename
    } = sourcePos;
    let line = sourcePos.line;
    if ((identifierName != null || identifierNamePos != null) && this._canMarkIdName) {
      sourcePos.identifierName = undefined;
      sourcePos.identifierNamePos = undefined;
    }
    let i = str.indexOf("\n");
    let last = 0;
    if (i !== 0) {
      this._mark(line, column, identifierName, identifierNamePos, filename);
    }
    while (i !== -1) {
      position.line++;
      position.column = 0;
      last = i + 1;
      if (last < len && line !== undefined) {
        this._mark(++line, 0, null, null, filename);
      }
      i = str.indexOf("\n", last);
    }
    position.column += len - last;
  }
  _mark(line, column, identifierName, identifierNamePos, filename) {
    var _this$_map;
    (_this$_map = this._map) == null ? void 0 : _this$_map.mark(this._position, line, column, identifierName, identifierNamePos, filename);
  }
  removeTrailingNewline() {
    const queueCursor = this._queueCursor;
    if (queueCursor !== 0 && this._queue[queueCursor - 1].char === 10) {
      this._queueCursor--;
    }
  }
  removeLastSemicolon() {
    const queueCursor = this._queueCursor;
    if (queueCursor !== 0 && this._queue[queueCursor - 1].char === 59) {
      this._queueCursor--;
    }
  }
  getLastChar() {
    const queueCursor = this._queueCursor;
    return queueCursor !== 0 ? this._queue[queueCursor - 1].char : this._last;
  }
  getNewlineCount() {
    const queueCursor = this._queueCursor;
    let count = 0;
    if (queueCursor === 0) return this._last === 10 ? 1 : 0;
    for (let i = queueCursor - 1; i >= 0; i--) {
      if (this._queue[i].char !== 10) {
        break;
      }
      count++;
    }
    return count === queueCursor && this._last === 10 ? count + 1 : count;
  }
  endsWithCharAndNewline() {
    const queue = this._queue;
    const queueCursor = this._queueCursor;
    if (queueCursor !== 0) {
      const lastCp = queue[queueCursor - 1].char;
      if (lastCp !== 10) return;
      if (queueCursor > 1) {
        return queue[queueCursor - 2].char;
      } else {
        return this._last;
      }
    }
  }
  hasContent() {
    return this._queueCursor !== 0 || !!this._last;
  }
  exactSource(loc, cb) {
    if (!this._map) {
      cb();
      return;
    }
    this.source("start", loc);
    const identifierName = loc.identifierName;
    const sourcePos = this._sourcePosition;
    if (identifierName) {
      this._canMarkIdName = false;
      sourcePos.identifierName = identifierName;
    }
    cb();
    if (identifierName) {
      this._canMarkIdName = true;
      sourcePos.identifierName = undefined;
      sourcePos.identifierNamePos = undefined;
    }
    this.source("end", loc);
  }
  source(prop, loc) {
    if (!this._map) return;
    this._normalizePosition(prop, loc, 0);
  }
  sourceWithOffset(prop, loc, columnOffset) {
    if (!this._map) return;
    this._normalizePosition(prop, loc, columnOffset);
  }
  withSource(prop, loc, cb) {
    if (this._map) {
      this.source(prop, loc);
    }
    cb();
  }
  _normalizePosition(prop, loc, columnOffset) {
    const pos = loc[prop];
    const target = this._sourcePosition;
    if (pos) {
      target.line = pos.line;
      target.column = Math.max(pos.column + columnOffset, 0);
      target.filename = loc.filename;
    }
  }
  getCurrentColumn() {
    const queue = this._queue;
    const queueCursor = this._queueCursor;
    let lastIndex = -1;
    let len = 0;
    for (let i = 0; i < queueCursor; i++) {
      const item = queue[i];
      if (item.char === 10) {
        lastIndex = len;
      }
      len += item.repeat;
    }
    return lastIndex === -1 ? this._position.column + len : len - 1 - lastIndex;
  }
  getCurrentLine() {
    let count = 0;
    const queue = this._queue;
    for (let i = 0; i < this._queueCursor; i++) {
      if (queue[i].char === 10) {
        count++;
      }
    }
    return this._position.line + count;
  }
}
exports.default = Buffer;

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