private String consumeInsideString()

in smithy-jmespath/src/main/java/software/amazon/smithy/jmespath/Lexer.java [304:393]
83 lines of code
24 McCabe index (conditional complexity)

    private String consumeInsideString() {
        StringBuilder builder = new StringBuilder();

        loop: while (!eof()) {
            switch (peek()) {
                case '"':
                    skip();
                    return builder.toString();
                case '\\':
                    skip();
                    switch (peek()) {
                        case '"':
                            builder.append('"');
                            skip();
                            break;
                        case 'n':
                            builder.append('\n');
                            skip();
                            break;
                        case 't':
                            builder.append('\t');
                            skip();
                            break;
                        case 'r':
                            builder.append('\r');
                            skip();
                            break;
                        case 'f':
                            builder.append('\f');
                            skip();
                            break;
                        case 'b':
                            builder.append('\b');
                            skip();
                            break;
                        case '/':
                            builder.append('/');
                            skip();
                            break;
                        case '\\':
                            builder.append('\\');
                            skip();
                            break;
                        case 'u':
                            // Read \ u XXXX
                            skip();
                            int unicode = 0;
                            for (int i = 0; i < 4; i++) {
                                char c = peek();
                                skip();
                                if (c >= '0' && c <= '9') {
                                    unicode = (unicode << 4) | (c - '0');
                                } else if (c >= 'a' && c <= 'f') {
                                    unicode = (unicode << 4) | (10 + c - 'a');
                                } else if (c >= 'A' && c <= 'F') {
                                    unicode = (unicode << 4) | (10 + c - 'A');
                                } else {
                                    throw syntax("Invalid unicode escape character: `" + c + "`");
                                }
                            }
                            builder.append((char) unicode);
                            break;
                        case '`':
                            // Ticks can be escaped when parsing literals.
                            if (currentlyParsingLiteral) {
                                builder.append('`');
                                skip();
                                break;
                            }
                            // fall-through.
                        default:
                            throw syntax("Invalid escape: " + peek());
                    }
                    break;
                case '`':
                    // If parsing a literal and an unescaped "`" is encountered,
                    // then the literal was erroneously closed while parsing a string.
                    if (currentlyParsingLiteral) {
                        skip();
                        break loop;
                    } // fall-through
                default:
                    builder.append(peek());
                    skip();
                    break;
            }
        }

        throw syntax("Unclosed quotes");
    }