@babel/parser/lib/parser/comments.js

A JavaScript parser

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;
exports.setInnerComments = setInnerComments;
var _base = require("./base");
function setTrailingComments(node, comments) {
  if (node.trailingComments === undefined) {
    node.trailingComments = comments;
  } else {
    node.trailingComments.unshift(...comments);
  }
}
function setLeadingComments(node, comments) {
  if (node.leadingComments === undefined) {
    node.leadingComments = comments;
  } else {
    node.leadingComments.unshift(...comments);
  }
}
function setInnerComments(node, comments) {
  if (node.innerComments === undefined) {
    node.innerComments = comments;
  } else {
    node.innerComments.unshift(...comments);
  }
}
function adjustInnerComments(node, elements, commentWS) {
  let lastElement = null;
  let i = elements.length;
  while (lastElement === null && i > 0) {
    lastElement = elements[--i];
  }
  if (lastElement === null || lastElement.start > commentWS.start) {
    setInnerComments(node, commentWS.comments);
  } else {
    setTrailingComments(lastElement, commentWS.comments);
  }
}
class CommentsParser extends _base.default {
  addComment(comment) {
    if (this.filename) comment.loc.filename = this.filename;
    this.state.comments.push(comment);
  }
  processComment(node) {
    const {
      commentStack
    } = this.state;
    const commentStackLength = commentStack.length;
    if (commentStackLength === 0) return;
    let i = commentStackLength - 1;
    const lastCommentWS = commentStack[i];
    if (lastCommentWS.start === node.end) {
      lastCommentWS.leadingNode = node;
      i--;
    }
    const {
      start: nodeStart
    } = node;
    for (; i >= 0; i--) {
      const commentWS = commentStack[i];
      const commentEnd = commentWS.end;
      if (commentEnd > nodeStart) {
        commentWS.containingNode = node;
        this.finalizeComment(commentWS);
        commentStack.splice(i, 1);
      } else {
        if (commentEnd === nodeStart) {
          commentWS.trailingNode = node;
        }
        break;
      }
    }
  }
  finalizeComment(commentWS) {
    const {
      comments
    } = commentWS;
    if (commentWS.leadingNode !== null || commentWS.trailingNode !== null) {
      if (commentWS.leadingNode !== null) {
        setTrailingComments(commentWS.leadingNode, comments);
      }
      if (commentWS.trailingNode !== null) {
        setLeadingComments(commentWS.trailingNode, comments);
      }
    } else {
      const {
        containingNode: node,
        start: commentStart
      } = commentWS;
      if (this.input.charCodeAt(commentStart - 1) === 44) {
        switch (node.type) {
          case "ObjectExpression":
          case "ObjectPattern":
          case "RecordExpression":
            adjustInnerComments(node, node.properties, commentWS);
            break;
          case "CallExpression":
          case "OptionalCallExpression":
            adjustInnerComments(node, node.arguments, commentWS);
            break;
          case "FunctionDeclaration":
          case "FunctionExpression":
          case "ArrowFunctionExpression":
          case "ObjectMethod":
          case "ClassMethod":
          case "ClassPrivateMethod":
            adjustInnerComments(node, node.params, commentWS);
            break;
          case "ArrayExpression":
          case "ArrayPattern":
          case "TupleExpression":
            adjustInnerComments(node, node.elements, commentWS);
            break;
          case "ExportNamedDeclaration":
          case "ImportDeclaration":
            adjustInnerComments(node, node.specifiers, commentWS);
            break;
          default:
            {
              setInnerComments(node, comments);
            }
        }
      } else {
        setInnerComments(node, comments);
      }
    }
  }
  finalizeRemainingComments() {
    const {
      commentStack
    } = this.state;
    for (let i = commentStack.length - 1; i >= 0; i--) {
      this.finalizeComment(commentStack[i]);
    }
    this.state.commentStack = [];
  }
  resetPreviousNodeTrailingComments(node) {
    const {
      commentStack
    } = this.state;
    const {
      length
    } = commentStack;
    if (length === 0) return;
    const commentWS = commentStack[length - 1];
    if (commentWS.leadingNode === node) {
      commentWS.leadingNode = null;
    }
  }
  resetPreviousIdentifierLeadingComments(node) {
    const {
      commentStack
    } = this.state;
    const {
      length
    } = commentStack;
    if (length === 0) return;
    if (commentStack[length - 1].trailingNode === node) {
      commentStack[length - 1].trailingNode = null;
    } else if (length >= 2 && commentStack[length - 2].trailingNode === node) {
      commentStack[length - 2].trailingNode = null;
    }
  }
  takeSurroundingComments(node, start, end) {
    const {
      commentStack
    } = this.state;
    const commentStackLength = commentStack.length;
    if (commentStackLength === 0) return;
    let i = commentStackLength - 1;
    for (; i >= 0; i--) {
      const commentWS = commentStack[i];
      const commentEnd = commentWS.end;
      const commentStart = commentWS.start;
      if (commentStart === end) {
        commentWS.leadingNode = node;
      } else if (commentEnd === start) {
        commentWS.trailingNode = node;
      } else if (commentEnd < start) {
        break;
      }
    }
  }
}
exports.default = CommentsParser;

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