java-parser/src/index.js

Java Parser in JavaScript

"use strict";
const JavaLexer = require("./lexer");
const JavaParser = require("./parser");
const { attachComments, matchFormatterOffOnPairs } = require("./comments");

const parser = new JavaParser();

const BaseJavaCstVisitor = parser.getBaseCstVisitorConstructor();
const BaseJavaCstVisitorWithDefaults = parser.getBaseCstVisitorConstructorWithDefaults();

function parse(inputText, entryPoint = "compilationUnit") {
  // Lex
  const lexResult = JavaLexer.tokenize(inputText);

  if (lexResult.errors.length > 0) {
    const firstError = lexResult.errors[0];
    throw Error(
      "Sad sad panda, lexing errors detected in line: " +
        firstError.line +
        ", column: " +
        firstError.column +
        "!\n" +
        firstError.message
    );
  }

  parser.input = lexResult.tokens;
  parser.mostEnclosiveCstNodeByStartOffset = {};
  parser.mostEnclosiveCstNodeByEndOffset = {};

  parser.setOnOffCommentPairs(
    matchFormatterOffOnPairs(lexResult.groups.comments)
  );

  // Automatic CST created when parsing
  const cst = parser[entryPoint]();

  if (parser.errors.length > 0) {
    const error = parser.errors[0];
    throw Error(
      "Sad sad panda, parsing errors detected in line: " +
        error.token.startLine +
        ", column: " +
        error.token.startColumn +
        "!\n" +
        error.message +
        "!\n\t->" +
        error.context.ruleStack.join("\n\t->")
    );
  }

  attachComments(
    lexResult.tokens,
    lexResult.groups.comments,
    parser.mostEnclosiveCstNodeByStartOffset,
    parser.mostEnclosiveCstNodeByEndOffset
  );

  return cst;
}

module.exports = {
  parse,
  BaseJavaCstVisitor,
  BaseJavaCstVisitorWithDefaults
};