decaffeinate-parser/dist/util/getOperatorInfoInRange.mjs

A better AST for CoffeeScript, inspired by CoffeeScriptRedux.

import SourceType from 'coffee-lex/dist/SourceType';
import { OperatorInfo } from '../nodes';
/**
 * Gets information about an operator token found between start and end source
 * offsets, exclusive. When calling, make sure `start` is before the text of
 * the operator in the range, and `end` is after it.
 */
export default function getOperatorInfoInRange(context, start, end) {
    var startIndex = context.sourceTokens.indexOfTokenNearSourceIndex(start);
    var endIndex = context.sourceTokens.indexOfTokenNearSourceIndex(end);
    if (!startIndex || !endIndex) {
        throw new Error("cannot find token indexes of range bounds: [" + start + ", " + end + "]");
    }
    var operatorIndex = context.sourceTokens.indexOfTokenMatchingPredicate(function (token) {
        return token.type !== SourceType.LPAREN && token.type !== SourceType.RPAREN;
    }, startIndex.next(), endIndex);
    var operatorToken = operatorIndex && context.sourceTokens.tokenAtIndex(operatorIndex);
    if (!operatorToken) {
        throw new Error("cannot find operator token in range: [" + start + ", " + end + "]");
    }
    return new OperatorInfo(context.source.slice(operatorToken.start, operatorToken.end), operatorToken);
}