function addComments()

in escodegen.js [659:770]
90 lines of code
24 McCabe index (conditional complexity)

    function addComments(stmt, result) {
        var i, len, comment, save, tailingToStatement, specialBase, fragment,
            extRange, range, prevRange, prefix, infix, suffix, count;

        if (stmt.leadingComments && stmt.leadingComments.length > 0) {
            save = result;

            if (preserveBlankLines) {
                comment = stmt.leadingComments[0];
                result = [];

                extRange = comment.extendedRange;
                range = comment.range;

                prefix = sourceCode.substring(extRange[0], range[0]);
                count = (prefix.match(/\n/g) || []).length;
                if (count > 0) {
                    result.push(stringRepeat('\n', count));
                    result.push(addIndent(generateComment(comment)));
                } else {
                    result.push(prefix);
                    result.push(generateComment(comment));
                }

                prevRange = range;

                for (i = 1, len = stmt.leadingComments.length; i < len; i++) {
                    comment = stmt.leadingComments[i];
                    range = comment.range;

                    infix = sourceCode.substring(prevRange[1], range[0]);
                    count = (infix.match(/\n/g) || []).length;
                    result.push(stringRepeat('\n', count));
                    result.push(addIndent(generateComment(comment)));

                    prevRange = range;
                }

                suffix = sourceCode.substring(range[1], extRange[1]);
                count = (suffix.match(/\n/g) || []).length;
                result.push(stringRepeat('\n', count));
            } else {
                comment = stmt.leadingComments[0];
                result = [];
                if (safeConcatenation && stmt.type === Syntax.Program && stmt.body.length === 0) {
                    result.push('\n');
                }
                result.push(generateComment(comment));
                if (!endsWithLineTerminator(toSourceNodeWhenNeeded(result).toString())) {
                    result.push('\n');
                }

                for (i = 1, len = stmt.leadingComments.length; i < len; ++i) {
                    comment = stmt.leadingComments[i];
                    fragment = [generateComment(comment)];
                    if (!endsWithLineTerminator(toSourceNodeWhenNeeded(fragment).toString())) {
                        fragment.push('\n');
                    }
                    result.push(addIndent(fragment));
                }
            }

            result.push(addIndent(save));
        }

        if (stmt.trailingComments) {

            if (preserveBlankLines) {
                comment = stmt.trailingComments[0];
                extRange = comment.extendedRange;
                range = comment.range;

                prefix = sourceCode.substring(extRange[0], range[0]);
                count = (prefix.match(/\n/g) || []).length;

                if (count > 0) {
                    result.push(stringRepeat('\n', count));
                    result.push(addIndent(generateComment(comment)));
                } else {
                    result.push(prefix);
                    result.push(generateComment(comment));
                }
            } else {
                tailingToStatement = !endsWithLineTerminator(toSourceNodeWhenNeeded(result).toString());
                specialBase = stringRepeat(' ', calculateSpaces(toSourceNodeWhenNeeded([base, result, indent]).toString()));
                for (i = 0, len = stmt.trailingComments.length; i < len; ++i) {
                    comment = stmt.trailingComments[i];
                    if (tailingToStatement) {
                        // We assume target like following script
                        //
                        // var t = 20;  /**
                        //               * This is comment of t
                        //               */
                        if (i === 0) {
                            // first case
                            result = [result, indent];
                        } else {
                            result = [result, specialBase];
                        }
                        result.push(generateComment(comment, specialBase));
                    } else {
                        result = [result, addIndent(generateComment(comment))];
                    }
                    if (i !== len - 1 && !endsWithLineTerminator(toSourceNodeWhenNeeded(result).toString())) {
                        result = [result, '\n'];
                    }
                }
            }
        }

        return result;
    }