mirror of
https://github.com/ggml-org/llama.cpp.git
synced 2025-11-03 09:22:01 +00:00
cbaadc9294
* grammars: reserve rejects & next candidates * grammars: reuse new_stacks * grammars: fix missing sig change in llama.h * grammars: fix test (api changed) * grammars: update gbnf-validator.cpp * grammars: simpler syntax (no swap)
133 lines
4.2 KiB
C++
133 lines
4.2 KiB
C++
#define LLAMA_API_INTERNAL
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#include "grammar-parser.h"
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#include "ggml.h"
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#include "llama.h"
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#include "unicode.h"
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#include <cstdio>
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#include <cstdlib>
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#include <string>
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#include <vector>
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static bool llama_sample_grammar_string(struct llama_grammar * grammar, const std::string & input_str, size_t & error_pos, std::string & error_msg) {
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auto decoded = decode_utf8(input_str, {});
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const auto & code_points = decoded.first;
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size_t pos = 0;
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for (auto it = code_points.begin(), end = code_points.end() - 1; it != end; ++it) {
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auto prev_stacks = grammar->stacks;
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llama_grammar_accept(grammar->rules, prev_stacks, *it, grammar->stacks);
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if (grammar->stacks.empty()) {
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error_pos = pos;
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error_msg = "Unexpected character '" + unicode_cpt_to_utf8(*it) + "'";
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grammar->stacks = prev_stacks;
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return false;
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}
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++pos;
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}
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for (const auto & stack : grammar->stacks) {
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if (stack.empty()) {
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return true;
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}
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}
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error_pos = pos;
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error_msg = "Unexpected end of input";
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return false;
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}
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static void print_error_message(const std::string & input_str, size_t error_pos, const std::string & error_msg) {
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fprintf(stdout, "Input string is invalid according to the grammar.\n");
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fprintf(stdout, "Error: %s at position %zu\n", error_msg.c_str(), error_pos);
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fprintf(stdout, "\n");
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fprintf(stdout, "Input string:\n");
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fprintf(stdout, "%s", input_str.substr(0, error_pos).c_str());
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if (error_pos < input_str.size()) {
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fprintf(stdout, "\033[1;31m%c", input_str[error_pos]);
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if (error_pos+1 < input_str.size()) {
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fprintf(stdout, "\033[0;31m%s", input_str.substr(error_pos+1).c_str());
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}
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fprintf(stdout, "\033[0m\n");
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}
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}
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int main(int argc, char** argv) {
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if (argc != 3) {
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fprintf(stdout, "Usage: %s <grammar_filename> <input_filename>\n", argv[0]);
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return 1;
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}
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const std::string grammar_filename = argv[1];
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const std::string input_filename = argv[2];
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// Read the GBNF grammar file
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FILE* grammar_file = fopen(grammar_filename.c_str(), "r");
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if (!grammar_file) {
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fprintf(stdout, "Failed to open grammar file: %s\n", grammar_filename.c_str());
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return 1;
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}
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fseek(grammar_file, 0, SEEK_END);
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size_t grammar_size = ftell(grammar_file);
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fseek(grammar_file, 0, SEEK_SET);
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std::string grammar_str(grammar_size, ' ');
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fread(&grammar_str[0], 1, grammar_size, grammar_file);
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fclose(grammar_file);
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// Parse the GBNF grammar
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auto parsed_grammar = grammar_parser::parse(grammar_str.c_str());
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// will be empty (default) if there are parse errors
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if (parsed_grammar.rules.empty()) {
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fprintf(stdout, "%s: failed to parse grammar\n", __func__);
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return 1;
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}
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// Ensure that there is a "root" node.
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if (parsed_grammar.symbol_ids.find("root") == parsed_grammar.symbol_ids.end()) {
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fprintf(stdout, "%s: grammar does not contain a 'root' symbol\n", __func__);
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return 1;
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}
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std::vector<const llama_grammar_element *> grammar_rules(parsed_grammar.c_rules());
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// Create the LLAMA grammar
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auto grammar = llama_grammar_init(
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grammar_rules.data(),
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grammar_rules.size(), parsed_grammar.symbol_ids.at("root"));
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// Read the input file
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FILE* input_file = fopen(input_filename.c_str(), "r");
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if (!input_file) {
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fprintf(stdout, "Failed to open input file: %s\n", input_filename.c_str());
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return 1;
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}
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fseek(input_file, 0, SEEK_END);
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size_t input_size = ftell(input_file);
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fseek(input_file, 0, SEEK_SET);
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std::string input_str(input_size, ' ');
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fread(&input_str[0], 1, input_size, input_file);
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fclose(input_file);
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// Validate the input string against the grammar
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size_t error_pos;
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std::string error_msg;
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bool is_valid = llama_sample_grammar_string(grammar, input_str, error_pos, error_msg);
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if (is_valid) {
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fprintf(stdout, "Input string is valid according to the grammar.\n");
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} else {
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print_error_message(input_str, error_pos, error_msg);
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}
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// Clean up
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llama_grammar_free(grammar);
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return 0;
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}
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