#include "../src/unicode.h"
#include "../src/llama-grammar.h"
#include <cstdio>
#include <cstdlib>
#include <sstream>
#include <fstream>
#include <string>
#include <vector>
static bool llama_grammar_validate(struct llama_grammar * grammar, const std::string & input_str, size_t & error_pos, std::string & error_msg) {
const auto cpts = unicode_cpts_from_utf8(input_str);
auto & stacks_cur = llama_grammar_get_stacks(grammar);
size_t pos = 0;
for (const auto & cpt : cpts) {
llama_grammar_accept(grammar, cpt);
if (stacks_cur.empty()) {
error_pos = pos;
error_msg = "Unexpected character '" + unicode_cpt_to_utf8(cpt) + "'";
return false;
}
++pos;
}
for (const auto & stack : stacks_cur) {
if (stack.empty()) {
return true;
}
}
error_pos = pos;
error_msg = "Unexpected end of input";
return false;
}
static void print_error_message(const std::string & input_str, size_t error_pos, const std::string & error_msg) {
fprintf(stdout, "Input string is invalid according to the grammar.\n");
fprintf(stdout, "Error: %s at position %zu\n", error_msg.c_str(), error_pos);
fprintf(stdout, "\n");
fprintf(stdout, "Input string:\n");
fprintf(stdout, "%s", input_str.substr(0, error_pos).c_str());
if (error_pos < input_str.size()) {
fprintf(stdout, "\033[1;31m%c", input_str[error_pos]);
if (error_pos+1 < input_str.size()) {
fprintf(stdout, "\033[0;31m%s", input_str.substr(error_pos+1).c_str());
}
fprintf(stdout, "\033[0m\n");
}
}
int main(int argc, char** argv) {
if (argc != 3) {
fprintf(stdout, "Usage: %s <grammar_filename> <input_filename>\n", argv[0]);
return 1;
}
const std::string grammar_filename = argv[1];
const std::string input_filename = argv[2];
// Read the GBNF grammar file
FILE* grammar_file = fopen(grammar_filename.c_str(), "r");
if (!grammar_file) {
fprintf(stdout, "Failed to open grammar file: %s\n", grammar_filename.c_str());
return 1;
}
std::string grammar_str;
{
std::ifstream grammar_file(grammar_filename);
GGML_ASSERT(grammar_file.is_open() && "Failed to open grammar file");
std::stringstream buffer;
buffer << grammar_file.rdbuf();
grammar_str = buffer.str();
}
llama_grammar * grammar = llama_grammar_init_impl(nullptr, grammar_str.c_str(), "root", false, nullptr, 0, nullptr, 0);
if (grammar == nullptr) {
fprintf(stdout, "Failed to initialize llama_grammar\n");
return 1;
}
// Read the input file
std::string input_str;
{
std::ifstream input_file(input_filename);
GGML_ASSERT(input_file.is_open() && "Failed to open input file");
std::stringstream buffer;
buffer << input_file.rdbuf();
input_str = buffer.str();
}
// Validate the input string against the grammar
size_t error_pos;
std::string error_msg;
bool is_valid = llama_grammar_validate(grammar, input_str, error_pos, error_msg);
if (is_valid) {
fprintf(stdout, "Input string is valid according to the grammar.\n");
} else {
print_error_message(input_str, error_pos, error_msg);
}
// Clean up
llama_grammar_free_impl(grammar);
return 0;
}