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#include "sql_reflect.h"
#include <library/cpp/resource/resource.h>
#include <util/string/split.h>
#include <util/string/strip.h>
namespace NSQLReflect {
const TStringBuf ReflectPrefix = "//!";
const TStringBuf SectionPrefix = "//! section:";
const TStringBuf SectionPunctuation = "//! section:punctuation";
const TStringBuf SectionLetter = "//! section:letter";
const TStringBuf SectionKeyword = "//! section:keyword";
const TStringBuf SectionOther = "//! section:other";
const TStringBuf FragmentPrefix = "fragment ";
TVector<TString> GetResourceLines(const TStringBuf key) {
TString text;
Y_ENSURE(NResource::FindExact(key, &text));
TVector<TString> lines;
Split(text, "\n", lines);
return lines;
}
void Format(TVector<TString>& lines) {
for (size_t i = 0; i < lines.size(); ++i) {
auto& line = lines[i];
StripInPlace(line);
if (line.StartsWith("//") || (line.Contains(':') && line.Contains(';'))) {
continue;
}
size_t j = i + 1;
do {
line += lines.at(j);
} while (!lines.at(j++).Contains(';'));
auto first = std::next(std::begin(lines), i + 1);
auto last = std::next(std::begin(lines), j);
lines.erase(first, last);
}
for (auto& line : lines) {
CollapseInPlace(line);
SubstGlobal(line, " ;", ";");
SubstGlobal(line, " :", ":");
SubstGlobal(line, " )", ")");
SubstGlobal(line, "( ", "(");
}
}
void Purify(TVector<TString>& lines) {
const auto [first, last] = std::ranges::remove_if(lines, [](const TString& line) {
return (line.StartsWith("//") && !line.StartsWith(ReflectPrefix)) || line.empty();
});
lines.erase(first, last);
}
THashMap<TStringBuf, TVector<TString>> GroupBySection(TVector<TString>&& lines) {
TVector<TStringBuf> sections = {
"",
SectionPunctuation,
SectionLetter,
SectionKeyword,
SectionOther,
};
size_t section = 0;
THashMap<TStringBuf, TVector<TString>> groups;
for (auto& line : lines) {
if (line.StartsWith(SectionPrefix)) {
Y_ENSURE(sections.at(section + 1) == line);
section += 1;
continue;
}
groups[sections.at(section)].emplace_back(std::move(line));
}
groups.erase("");
groups.erase(SectionLetter);
return groups;
}
std::tuple<TString, TString> ParseLexerRule(TString&& line) {
size_t colonPos = line.find(':');
size_t semiPos = line.rfind(';');
Y_ENSURE(
colonPos != TString::npos &&
semiPos != TString::npos &&
colonPos < semiPos);
TString block = line.substr(colonPos + 2, semiPos - colonPos - 2);
SubstGlobal(block, "\\\\", "\\");
TString name = std::move(line);
name.resize(colonPos);
return std::make_tuple(std::move(name), std::move(block));
}
void ParsePunctuationLine(TString&& line, TLexerGrammar& grammar) {
auto [name, block] = ParseLexerRule(std::move(line));
block = block.erase(std::begin(block));
block.pop_back();
SubstGlobal(block, "\\\'", "\'");
if (!name.StartsWith(FragmentPrefix)) {
grammar.PunctuationNames.emplace(name);
}
SubstGlobal(name, FragmentPrefix, "");
grammar.BlockByName.emplace(std::move(name), std::move(block));
}
void ParseKeywordLine(TString&& line, TLexerGrammar& grammar) {
auto [name, block] = ParseLexerRule(std::move(line));
SubstGlobal(block, "'", "");
SubstGlobal(block, " ", "");
Y_ENSURE(name == block || (name == "TSKIP" && block == "SKIP"));
grammar.KeywordNames.emplace(std::move(name));
}
void ParseOtherLine(TString&& line, TLexerGrammar& grammar) {
auto [name, block] = ParseLexerRule(std::move(line));
if (!name.StartsWith(FragmentPrefix)) {
grammar.OtherNames.emplace_back(name);
}
SubstGlobal(name, FragmentPrefix, "");
SubstGlobal(block, " -> channel(HIDDEN)", "");
grammar.BlockByName.emplace(std::move(name), std::move(block));
}
TLexerGrammar LoadLexerGrammar() {
TVector<TString> lines = GetResourceLines("SQLv1Antlr4.g.in");
Purify(lines);
Format(lines);
Purify(lines);
THashMap<TStringBuf, TVector<TString>> sections;
sections = GroupBySection(std::move(lines));
TLexerGrammar grammar;
for (auto& [section, lines] : sections) {
for (auto& line : lines) {
if (section == SectionPunctuation) {
ParsePunctuationLine(std::move(line), grammar);
} else if (section == SectionKeyword) {
ParseKeywordLine(std::move(line), grammar);
} else if (section == SectionOther) {
ParseOtherLine(std::move(line), grammar);
} else {
Y_ABORT("Unexpected section %s", section);
}
}
}
return grammar;
}
} // namespace NSQLReflect
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