decaffeinate-parser/dist/util/isPlusTokenBetweenRanges.js

A better AST for CoffeeScript, inspired by CoffeeScriptRedux.

"use strict";
exports.__esModule = true;
var coffee_lex_1 = require("coffee-lex");
/**
 * Given the ranges of two operands, determine from the token list whether there
 * is a real '+' operator between them. A plus operation without an actual '+'
 * operator is an implicit string interpolation operation.
 */
function isPlusTokenBetweenRanges(leftRange, rightRange, context) {
    var tokens = context.sourceTokens;
    var leftEnd = tokens.indexOfTokenContainingSourceIndex(leftRange[1] - 1);
    var rightStart = tokens.indexOfTokenContainingSourceIndex(rightRange[0]);
    // Normal '+' operators should find tokens here, so if we don't, this must be
    // an implicit '+' operator.
    if (!leftEnd || !rightStart) {
        return false;
    }
    var afterLeftEnd = leftEnd.next();
    if (!afterLeftEnd) {
        return false;
    }
    var tokensBetweenOperands = tokens.slice(afterLeftEnd, rightStart);
    // If we find an actual operator, this must have been a real '+'. Otherwise,
    // this must be an implicit '+'.
    var foundPlusToken = false;
    tokensBetweenOperands.forEach(function (_a) {
        var type = _a.type, start = _a.start, end = _a.end;
        if (type === coffee_lex_1.SourceType.OPERATOR &&
            context.source.slice(start, end) === '+') {
            foundPlusToken = true;
        }
    });
    return foundPlusToken;
}
exports["default"] = isPlusTokenBetweenRanges;