public String nextToken()

in src/main/core-api/java/com/mysql/cj/util/EscapeTokenizer.java [87:220]
105 lines of code
37 McCabe index (conditional complexity)

    public String nextToken() {
        this.lock.lock();
        try {
            StringBuilder tokenBuf = new StringBuilder();
            boolean backslashEscape = false;

            if (this.emittingEscapeCode) {
                // Previous token ended at the beginning of an escape code, so this token must start with '{'
                tokenBuf.append("{");
                this.emittingEscapeCode = false;
            }

            for (; this.pos < this.sourceLength; this.pos++) {
                char c = this.source.charAt(this.pos);

                // process escape char: (\)
                if (c == CHR_BACKSLASH) {
                    tokenBuf.append(c);
                    backslashEscape = !backslashEscape;
                    continue;
                }

                // process quotes: ('|")
                if ((c == CHR_SGL_QUOTE || c == CHR_DBL_QUOTE) && !backslashEscape) {
                    tokenBuf.append(c);
                    if (this.inQuotes) {
                        if (c == this.quoteChar) {
                            // look ahead for doubled quote
                            if (this.pos + 1 < this.sourceLength && this.source.charAt(this.pos + 1) == this.quoteChar) {
                                tokenBuf.append(c);
                                this.pos++; // consume following char '\'' or '"'
                            } else {
                                this.inQuotes = false;
                            }
                        }
                    } else {
                        this.inQuotes = true;
                        this.quoteChar = c;
                    }
                    continue;
                }

                // process new line: (\n|\r)
                if (c == CHR_LF || c == CHR_CR) {
                    tokenBuf.append(c);
                    backslashEscape = false;
                    continue;
                }

                if (!this.inQuotes && !backslashEscape) {
                    // process slash-star comments: (/* */)
                    if (c == CHR_SLASH) {
                        tokenBuf.append(c);
                        // look ahead for asterisk
                        if (this.pos + 1 < this.sourceLength && this.source.charAt(this.pos + 1) == CHR_STAR) {
                            // consume following chars until end of comment
                            while (++this.pos < this.sourceLength - 1) {
                                c = this.source.charAt(this.pos);
                                tokenBuf.append(c);
                                if (c == CHR_STAR && this.source.charAt(this.pos + 1) == CHR_SLASH) {
                                    tokenBuf.append(CHR_SLASH);
                                    this.pos++;
                                    break;
                                }
                            }
                        }
                        continue;
                    }

                    // process hash comment char: (#)
                    if (c == CHR_HASH) {
                        tokenBuf.append(c);
                        // consume following chars until new line or end of string
                        while (++this.pos < this.sourceLength && c != CHR_LF && c != CHR_CR) {
                            c = this.source.charAt(this.pos);
                            tokenBuf.append(c);
                        }
                        this.pos--;
                        continue;
                    }

                    // process comments: (--)
                    if (c == CHR_DASH) {
                        tokenBuf.append(c);
                        // look ahead for double hyphen and a space
                        if (this.pos + 2 < this.sourceLength && this.source.charAt(this.pos + 1) == CHR_DASH && this.source.charAt(this.pos + 2) == CHR_SPACE) {
                            // consume following chars until new line or end of string
                            while (++this.pos < this.sourceLength && c != CHR_LF && c != CHR_CR) {
                                c = this.source.charAt(this.pos);
                                tokenBuf.append(c);
                            }
                            this.pos--;
                        }
                        continue;
                    }

                    // process begin token: ({)
                    if (c == CHR_BEGIN_TOKEN) {
                        this.bracesLevel++;
                        if (this.bracesLevel == 1) {
                            this.emittingEscapeCode = true;
                            this.pos++; // consume char '{' before returning
                            return tokenBuf.toString();
                        }
                        tokenBuf.append(c);
                        continue;
                    }

                    // process end token: (})
                    if (c == CHR_END_TOKEN) {
                        tokenBuf.append(c);
                        this.bracesLevel--;
                        if (this.bracesLevel == 0) {
                            this.pos++; // consume char '}' before returning
                            return tokenBuf.toString();
                        }
                        continue;
                    }

                    // detect variable usage: (@)
                    if (c == CHR_VARIABLE) {
                        this.sawVariableUse = true;
                    }
                }

                tokenBuf.append(c);
                backslashEscape = false;
            }

            return tokenBuf.toString();
        } finally {
            this.lock.unlock();
        }
    }