mirror of
https://github.com/ggerganov/llama.cpp.git
synced 2024-12-30 21:34:36 +00:00
425 lines
17 KiB
C++
425 lines
17 KiB
C++
#include "grammar-parser.h"
|
|
#include <cstdint>
|
|
#include <cwchar>
|
|
#include <string>
|
|
#include <utility>
|
|
#include <stdexcept>
|
|
#include <exception>
|
|
|
|
namespace grammar_parser {
|
|
// NOTE: assumes valid utf8 (but checks for overrun)
|
|
// copied from llama.cpp
|
|
static std::pair<uint32_t, const char *> decode_utf8(const char * src) {
|
|
static const int lookup[] = { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 3, 4 };
|
|
uint8_t first_byte = static_cast<uint8_t>(*src);
|
|
uint8_t highbits = first_byte >> 4;
|
|
int len = lookup[highbits];
|
|
uint8_t mask = (1 << (8 - len)) - 1;
|
|
uint32_t value = first_byte & mask;
|
|
const char * end = src + len; // may overrun!
|
|
const char * pos = src + 1;
|
|
for ( ; pos < end && *pos; pos++) {
|
|
value = (value << 6) + (static_cast<uint8_t>(*pos) & 0x3F);
|
|
}
|
|
return std::make_pair(value, pos);
|
|
}
|
|
|
|
static uint32_t get_symbol_id(parse_state & state, const char * src, size_t len) {
|
|
uint32_t next_id = static_cast<uint32_t>(state.symbol_ids.size());
|
|
auto result = state.symbol_ids.insert(std::make_pair(std::string(src, len), next_id));
|
|
return result.first->second;
|
|
}
|
|
|
|
static uint32_t generate_symbol_id(parse_state & state, const std::string & base_name) {
|
|
uint32_t next_id = static_cast<uint32_t>(state.symbol_ids.size());
|
|
state.symbol_ids[base_name + '_' + std::to_string(next_id)] = next_id;
|
|
return next_id;
|
|
}
|
|
|
|
static void add_rule(
|
|
parse_state & state,
|
|
uint32_t rule_id,
|
|
const std::vector<llama_grammar_element> & rule) {
|
|
if (state.rules.size() <= rule_id) {
|
|
state.rules.resize(rule_id + 1);
|
|
}
|
|
state.rules[rule_id] = rule;
|
|
}
|
|
|
|
static bool is_word_char(char c) {
|
|
return ('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z') || c == '-' || ('0' <= c && c <= '9');
|
|
}
|
|
|
|
static std::pair<uint32_t, const char *> parse_hex(const char * src, int size) {
|
|
const char * pos = src;
|
|
const char * end = src + size;
|
|
uint32_t value = 0;
|
|
for ( ; pos < end && *pos; pos++) {
|
|
value <<= 4;
|
|
char c = *pos;
|
|
if ('a' <= c && c <= 'f') {
|
|
value += c - 'a' + 10;
|
|
} else if ('A' <= c && c <= 'F') {
|
|
value += c - 'A' + 10;
|
|
} else if ('0' <= c && c <= '9') {
|
|
value += c - '0';
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
if (pos != end) {
|
|
throw std::runtime_error("expecting " + std::to_string(size) + " hex chars at " + src);
|
|
}
|
|
return std::make_pair(value, pos);
|
|
}
|
|
|
|
static const char * parse_space(const char * src, bool newline_ok) {
|
|
const char * pos = src;
|
|
while (*pos == ' ' || *pos == '\t' || *pos == '#' ||
|
|
(newline_ok && (*pos == '\r' || *pos == '\n'))) {
|
|
if (*pos == '#') {
|
|
while (*pos && *pos != '\r' && *pos != '\n') {
|
|
pos++;
|
|
}
|
|
} else {
|
|
pos++;
|
|
}
|
|
}
|
|
return pos;
|
|
}
|
|
|
|
static const char * parse_name(const char * src) {
|
|
const char * pos = src;
|
|
while (is_word_char(*pos)) {
|
|
pos++;
|
|
}
|
|
if (pos == src) {
|
|
throw std::runtime_error(std::string("expecting name at ") + src);
|
|
}
|
|
return pos;
|
|
}
|
|
|
|
static std::pair<uint32_t, const char *> parse_char(const char * src) {
|
|
if (*src == '\\') {
|
|
switch (src[1]) {
|
|
case 'x': return parse_hex(src + 2, 2);
|
|
case 'u': return parse_hex(src + 2, 4);
|
|
case 'U': return parse_hex(src + 2, 8);
|
|
case 't': return std::make_pair('\t', src + 2);
|
|
case 'r': return std::make_pair('\r', src + 2);
|
|
case 'n': return std::make_pair('\n', src + 2);
|
|
case '\\':
|
|
case '"':
|
|
case '[':
|
|
case ']':
|
|
return std::make_pair(src[1], src + 2);
|
|
default:
|
|
throw std::runtime_error(std::string("unknown escape at ") + src);
|
|
}
|
|
} else if (*src) {
|
|
return decode_utf8(src);
|
|
}
|
|
throw std::runtime_error("unexpected end of input");
|
|
}
|
|
|
|
const char * parse_alternates(
|
|
parse_state & state,
|
|
const char * src,
|
|
const std::string & rule_name,
|
|
uint32_t rule_id,
|
|
bool is_nested);
|
|
|
|
static const char * parse_sequence(
|
|
parse_state & state,
|
|
const char * src,
|
|
const std::string & rule_name,
|
|
std::vector<llama_grammar_element> & out_elements,
|
|
bool is_nested) {
|
|
size_t last_sym_start = out_elements.size();
|
|
const char * pos = src;
|
|
while (*pos) {
|
|
if (*pos == '"') { // literal string
|
|
pos++;
|
|
last_sym_start = out_elements.size();
|
|
while (*pos != '"') {
|
|
auto char_pair = parse_char(pos);
|
|
pos = char_pair.second;
|
|
out_elements.push_back({LLAMA_GRETYPE_CHAR, char_pair.first});
|
|
}
|
|
pos = parse_space(pos + 1, is_nested);
|
|
} else if (*pos == '[') { // char range(s)
|
|
pos++;
|
|
enum llama_gretype start_type = LLAMA_GRETYPE_CHAR;
|
|
if (*pos == '^') {
|
|
pos++;
|
|
start_type = LLAMA_GRETYPE_CHAR_NOT;
|
|
}
|
|
last_sym_start = out_elements.size();
|
|
while (*pos != ']') {
|
|
auto char_pair = parse_char(pos);
|
|
pos = char_pair.second;
|
|
enum llama_gretype type = last_sym_start < out_elements.size()
|
|
? LLAMA_GRETYPE_CHAR_ALT
|
|
: start_type;
|
|
|
|
out_elements.push_back({type, char_pair.first});
|
|
if (pos[0] == '-' && pos[1] != ']') {
|
|
auto endchar_pair = parse_char(pos + 1);
|
|
pos = endchar_pair.second;
|
|
out_elements.push_back({LLAMA_GRETYPE_CHAR_RNG_UPPER, endchar_pair.first});
|
|
}
|
|
}
|
|
pos = parse_space(pos + 1, is_nested);
|
|
} else if (is_word_char(*pos)) { // rule reference
|
|
const char * name_end = parse_name(pos);
|
|
uint32_t ref_rule_id = get_symbol_id(state, pos, name_end - pos);
|
|
pos = parse_space(name_end, is_nested);
|
|
last_sym_start = out_elements.size();
|
|
out_elements.push_back({LLAMA_GRETYPE_RULE_REF, ref_rule_id});
|
|
} else if (*pos == '(') { // grouping
|
|
// parse nested alternates into synthesized rule
|
|
pos = parse_space(pos + 1, true);
|
|
uint32_t sub_rule_id = generate_symbol_id(state, rule_name);
|
|
pos = parse_alternates(state, pos, rule_name, sub_rule_id, true);
|
|
last_sym_start = out_elements.size();
|
|
// output reference to synthesized rule
|
|
out_elements.push_back({LLAMA_GRETYPE_RULE_REF, sub_rule_id});
|
|
if (*pos != ')') {
|
|
throw std::runtime_error(std::string("expecting ')' at ") + pos);
|
|
}
|
|
pos = parse_space(pos + 1, is_nested);
|
|
} else if (*pos == '*' || *pos == '+' || *pos == '?') { // repetition operator
|
|
if (last_sym_start == out_elements.size()) {
|
|
throw std::runtime_error(std::string("expecting preceding item to */+/? at ") + pos);
|
|
}
|
|
|
|
// apply transformation to previous symbol (last_sym_start to end) according to
|
|
// rewrite rules:
|
|
// S* --> S' ::= S S' |
|
|
// S+ --> S' ::= S S' | S
|
|
// S? --> S' ::= S |
|
|
uint32_t sub_rule_id = generate_symbol_id(state, rule_name);
|
|
std::vector<llama_grammar_element> sub_rule;
|
|
// add preceding symbol to generated rule
|
|
sub_rule.insert(
|
|
sub_rule.end(), out_elements.begin() + last_sym_start, out_elements.end());
|
|
if (*pos == '*' || *pos == '+') {
|
|
// cause generated rule to recurse
|
|
sub_rule.push_back({LLAMA_GRETYPE_RULE_REF, sub_rule_id});
|
|
}
|
|
// mark start of alternate def
|
|
sub_rule.push_back({LLAMA_GRETYPE_ALT, 0});
|
|
if (*pos == '+') {
|
|
// add preceding symbol as alternate only for '+' (otherwise empty)
|
|
sub_rule.insert(
|
|
sub_rule.end(), out_elements.begin() + last_sym_start, out_elements.end());
|
|
}
|
|
sub_rule.push_back({LLAMA_GRETYPE_END, 0});
|
|
add_rule(state, sub_rule_id, sub_rule);
|
|
|
|
// in original rule, replace previous symbol with reference to generated rule
|
|
out_elements.resize(last_sym_start);
|
|
out_elements.push_back({LLAMA_GRETYPE_RULE_REF, sub_rule_id});
|
|
|
|
pos = parse_space(pos + 1, is_nested);
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
return pos;
|
|
}
|
|
|
|
const char * parse_alternates(
|
|
parse_state & state,
|
|
const char * src,
|
|
const std::string & rule_name,
|
|
uint32_t rule_id,
|
|
bool is_nested) {
|
|
std::vector<llama_grammar_element> rule;
|
|
const char * pos = parse_sequence(state, src, rule_name, rule, is_nested);
|
|
while (*pos == '|') {
|
|
rule.push_back({LLAMA_GRETYPE_ALT, 0});
|
|
pos = parse_space(pos + 1, true);
|
|
pos = parse_sequence(state, pos, rule_name, rule, is_nested);
|
|
}
|
|
rule.push_back({LLAMA_GRETYPE_END, 0});
|
|
add_rule(state, rule_id, rule);
|
|
return pos;
|
|
}
|
|
|
|
static const char * parse_rule(parse_state & state, const char * src) {
|
|
const char * name_end = parse_name(src);
|
|
const char * pos = parse_space(name_end, false);
|
|
size_t name_len = name_end - src;
|
|
uint32_t rule_id = get_symbol_id(state, src, name_len);
|
|
const std::string name(src, name_len);
|
|
|
|
if (!(pos[0] == ':' && pos[1] == ':' && pos[2] == '=')) {
|
|
throw std::runtime_error(std::string("expecting ::= at ") + pos);
|
|
}
|
|
pos = parse_space(pos + 3, true);
|
|
|
|
pos = parse_alternates(state, pos, name, rule_id, false);
|
|
|
|
if (*pos == '\r') {
|
|
pos += pos[1] == '\n' ? 2 : 1;
|
|
} else if (*pos == '\n') {
|
|
pos++;
|
|
} else if (*pos) {
|
|
throw std::runtime_error(std::string("expecting newline or end at ") + pos);
|
|
}
|
|
return parse_space(pos, true);
|
|
}
|
|
|
|
parse_state parse(const char * src) {
|
|
try {
|
|
parse_state state;
|
|
const char * pos = parse_space(src, true);
|
|
while (*pos) {
|
|
pos = parse_rule(state, pos);
|
|
}
|
|
return state;
|
|
} catch (const std::exception & err) {
|
|
fprintf(stderr, "%s: error parsing grammar: %s\n", __func__, err.what());
|
|
return parse_state();
|
|
}
|
|
}
|
|
|
|
static void print_grammar_char(FILE * file, uint32_t c) {
|
|
if (0x20 <= c && c <= 0x7f) {
|
|
fprintf(file, "%c", static_cast<char>(c));
|
|
} else {
|
|
// cop out of encoding UTF-8
|
|
fprintf(file, "<U+%04X>", c);
|
|
}
|
|
}
|
|
|
|
static bool is_char_element(llama_grammar_element elem) {
|
|
switch (elem.type) {
|
|
case LLAMA_GRETYPE_CHAR: return true;
|
|
case LLAMA_GRETYPE_CHAR_NOT: return true;
|
|
case LLAMA_GRETYPE_CHAR_ALT: return true;
|
|
case LLAMA_GRETYPE_CHAR_RNG_UPPER: return true;
|
|
default: return false;
|
|
}
|
|
}
|
|
|
|
static void print_rule_binary(FILE * file, const std::vector<llama_grammar_element> & rule) {
|
|
for (auto elem : rule) {
|
|
switch (elem.type) {
|
|
case LLAMA_GRETYPE_END: fprintf(file, "END"); break;
|
|
case LLAMA_GRETYPE_ALT: fprintf(file, "ALT"); break;
|
|
case LLAMA_GRETYPE_RULE_REF: fprintf(file, "RULE_REF"); break;
|
|
case LLAMA_GRETYPE_CHAR: fprintf(file, "CHAR"); break;
|
|
case LLAMA_GRETYPE_CHAR_NOT: fprintf(file, "CHAR_NOT"); break;
|
|
case LLAMA_GRETYPE_CHAR_RNG_UPPER: fprintf(file, "CHAR_RNG_UPPER"); break;
|
|
case LLAMA_GRETYPE_CHAR_ALT: fprintf(file, "CHAR_ALT"); break;
|
|
}
|
|
switch (elem.type) {
|
|
case LLAMA_GRETYPE_END:
|
|
case LLAMA_GRETYPE_ALT:
|
|
case LLAMA_GRETYPE_RULE_REF:
|
|
fprintf(file, "(%u) ", elem.value);
|
|
break;
|
|
case LLAMA_GRETYPE_CHAR:
|
|
case LLAMA_GRETYPE_CHAR_NOT:
|
|
case LLAMA_GRETYPE_CHAR_RNG_UPPER:
|
|
case LLAMA_GRETYPE_CHAR_ALT:
|
|
fprintf(file, "(\"");
|
|
print_grammar_char(file, elem.value);
|
|
fprintf(file, "\") ");
|
|
break;
|
|
}
|
|
}
|
|
fprintf(file, "\n");
|
|
}
|
|
|
|
static void print_rule(
|
|
FILE * file,
|
|
uint32_t rule_id,
|
|
const std::vector<llama_grammar_element> & rule,
|
|
const std::map<uint32_t, std::string> & symbol_id_names) {
|
|
if (rule.empty() || rule.back().type != LLAMA_GRETYPE_END) {
|
|
throw std::runtime_error(
|
|
"malformed rule, does not end with LLAMA_GRETYPE_END: " + std::to_string(rule_id));
|
|
}
|
|
fprintf(file, "%s ::= ", symbol_id_names.at(rule_id).c_str());
|
|
for (size_t i = 0, end = rule.size() - 1; i < end; i++) {
|
|
llama_grammar_element elem = rule[i];
|
|
switch (elem.type) {
|
|
case LLAMA_GRETYPE_END:
|
|
throw std::runtime_error(
|
|
"unexpected end of rule: " + std::to_string(rule_id) + "," +
|
|
std::to_string(i));
|
|
case LLAMA_GRETYPE_ALT:
|
|
fprintf(file, "| ");
|
|
break;
|
|
case LLAMA_GRETYPE_RULE_REF:
|
|
fprintf(file, "%s ", symbol_id_names.at(elem.value).c_str());
|
|
break;
|
|
case LLAMA_GRETYPE_CHAR:
|
|
fprintf(file, "[");
|
|
print_grammar_char(file, elem.value);
|
|
break;
|
|
case LLAMA_GRETYPE_CHAR_NOT:
|
|
fprintf(file, "[^");
|
|
print_grammar_char(file, elem.value);
|
|
break;
|
|
case LLAMA_GRETYPE_CHAR_RNG_UPPER:
|
|
if (i == 0 || !is_char_element(rule[i - 1])) {
|
|
throw std::runtime_error(
|
|
"LLAMA_GRETYPE_CHAR_RNG_UPPER without preceding char: " +
|
|
std::to_string(rule_id) + "," + std::to_string(i));
|
|
}
|
|
fprintf(file, "-");
|
|
print_grammar_char(file, elem.value);
|
|
break;
|
|
case LLAMA_GRETYPE_CHAR_ALT:
|
|
if (i == 0 || !is_char_element(rule[i - 1])) {
|
|
throw std::runtime_error(
|
|
"LLAMA_GRETYPE_CHAR_ALT without preceding char: " +
|
|
std::to_string(rule_id) + "," + std::to_string(i));
|
|
}
|
|
print_grammar_char(file, elem.value);
|
|
break;
|
|
}
|
|
if (is_char_element(elem)) {
|
|
switch (rule[i + 1].type) {
|
|
case LLAMA_GRETYPE_CHAR_ALT:
|
|
case LLAMA_GRETYPE_CHAR_RNG_UPPER:
|
|
break;
|
|
default:
|
|
fprintf(file, "] ");
|
|
}
|
|
}
|
|
}
|
|
fprintf(file, "\n");
|
|
}
|
|
|
|
void print_grammar(FILE * file, const parse_state & state) {
|
|
try {
|
|
std::map<uint32_t, std::string> symbol_id_names;
|
|
for (const auto & kv : state.symbol_ids) {
|
|
symbol_id_names[kv.second] = kv.first;
|
|
}
|
|
for (size_t i = 0, end = state.rules.size(); i < end; i++) {
|
|
// fprintf(file, "%zu: ", i);
|
|
// print_rule_binary(file, state.rules[i]);
|
|
print_rule(file, uint32_t(i), state.rules[i], symbol_id_names);
|
|
// fprintf(file, "\n");
|
|
}
|
|
} catch (const std::exception & err) {
|
|
fprintf(stderr, "\n%s: error printing grammar: %s\n", __func__, err.what());
|
|
}
|
|
}
|
|
|
|
std::vector<const llama_grammar_element *> parse_state::c_rules() {
|
|
std::vector<const llama_grammar_element *> ret;
|
|
ret.reserve(rules.size());
|
|
for (const auto & rule : rules) {
|
|
ret.push_back(rule.data());
|
|
}
|
|
return ret;
|
|
}
|
|
}
|