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//===---- QueryParser.cpp - mlir-query command parser ---------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "QueryParser.h"
#include "llvm/ADT/StringSwitch.h"
namespace mlir::query {
// Lex any amount of whitespace followed by a "word" (any sequence of
// non-whitespace characters) from the start of region [begin,end). If no word
// is found before end, return StringRef(). begin is adjusted to exclude the
// lexed region.
llvm::StringRef QueryParser::lexWord() {
// Don't trim newlines.
line = line.ltrim(" \t\v\f\r");
if (line.empty())
// Even though the line is empty, it contains a pointer and
// a (zero) length. The pointer is used in the LexOrCompleteWord
// code completion.
return line;
llvm::StringRef word;
if (line.front() == '#') {
word = line.substr(0, 1);
} else {
word = line.take_until([](char c) {
// Don't trim newlines.
return llvm::StringRef(" \t\v\f\r").contains(c);
});
}
line = line.drop_front(word.size());
return word;
}
// This is the StringSwitch-alike used by LexOrCompleteWord below. See that
// function for details.
template <typename T>
struct QueryParser::LexOrCompleteWord {
llvm::StringRef word;
llvm::StringSwitch<T> stringSwitch;
QueryParser *queryParser;
// Set to the completion point offset in word, or StringRef::npos if
// completion point not in word.
size_t wordCompletionPos;
// Lexes a word and stores it in word. Returns a LexOrCompleteword<T> object
// that can be used like a llvm::StringSwitch<T>, but adds cases as possible
// completions if the lexed word contains the completion point.
LexOrCompleteWord(QueryParser *queryParser, llvm::StringRef &outWord)
: word(queryParser->lexWord()), stringSwitch(word),
queryParser(queryParser), wordCompletionPos(llvm::StringRef::npos) {
outWord = word;
if (queryParser->completionPos &&
queryParser->completionPos <= word.data() + word.size()) {
if (queryParser->completionPos < word.data())
wordCompletionPos = 0;
else
wordCompletionPos = queryParser->completionPos - word.data();
}
}
LexOrCompleteWord &Case(llvm::StringLiteral caseStr, const T &value,
bool isCompletion = true) {
if (wordCompletionPos == llvm::StringRef::npos)
stringSwitch.Case(caseStr, value);
else if (!caseStr.empty() && isCompletion &&
wordCompletionPos <= caseStr.size() &&
caseStr.substr(0, wordCompletionPos) ==
word.substr(0, wordCompletionPos)) {
queryParser->completions.emplace_back(
(caseStr.substr(wordCompletionPos) + " ").str(),
std::string(caseStr));
}
return *this;
}
T Default(T value) { return stringSwitch.Default(value); }
};
QueryRef QueryParser::endQuery(QueryRef queryRef) {
llvm::StringRef extra = line;
llvm::StringRef extraTrimmed = extra.ltrim(" \t\v\f\r");
if (extraTrimmed.starts_with('\n') || extraTrimmed.starts_with("\r\n"))
queryRef->remainingContent = extra;
else {
llvm::StringRef trailingWord = lexWord();
if (trailingWord.starts_with('#')) {
line = line.drop_until([](char c) { return c == '\n'; });
line = line.drop_while([](char c) { return c == '\n'; });
return endQuery(queryRef);
}
if (!trailingWord.empty()) {
return new InvalidQuery("unexpected extra input: '" + extra + "'");
}
}
return queryRef;
}
namespace {
enum class ParsedQueryKind {
Invalid,
Comment,
NoOp,
Help,
Match,
Quit,
};
QueryRef
makeInvalidQueryFromDiagnostics(const matcher::internal::Diagnostics &diag) {
std::string errStr;
llvm::raw_string_ostream os(errStr);
diag.print(os);
return new InvalidQuery(errStr);
}
} // namespace
QueryRef QueryParser::completeMatcherExpression() {
std::vector<matcher::MatcherCompletion> comps =
matcher::internal::Parser::completeExpression(
line, completionPos - line.begin(), qs.getRegistryData(),
&qs.namedValues);
for (const auto &comp : comps) {
completions.emplace_back(comp.typedText, comp.matcherDecl);
}
return QueryRef();
}
QueryRef QueryParser::doParse() {
llvm::StringRef commandStr;
ParsedQueryKind qKind =
LexOrCompleteWord<ParsedQueryKind>(this, commandStr)
.Case("", ParsedQueryKind::NoOp)
.Case("#", ParsedQueryKind::Comment, /*isCompletion=*/false)
.Case("help", ParsedQueryKind::Help)
.Case("m", ParsedQueryKind::Match, /*isCompletion=*/false)
.Case("match", ParsedQueryKind::Match)
.Case("q", ParsedQueryKind::Quit, /*IsCompletion=*/false)
.Case("quit", ParsedQueryKind::Quit)
.Default(ParsedQueryKind::Invalid);
switch (qKind) {
case ParsedQueryKind::Comment:
case ParsedQueryKind::NoOp:
line = line.drop_until([](char c) { return c == '\n'; });
line = line.drop_while([](char c) { return c == '\n'; });
if (line.empty())
return new NoOpQuery;
return doParse();
case ParsedQueryKind::Help:
return endQuery(new HelpQuery);
case ParsedQueryKind::Quit:
return endQuery(new QuitQuery);
case ParsedQueryKind::Match: {
if (completionPos) {
return completeMatcherExpression();
}
matcher::internal::Diagnostics diag;
auto matcherSource = line.ltrim();
auto origMatcherSource = matcherSource;
std::optional<matcher::DynMatcher> matcher =
matcher::internal::Parser::parseMatcherExpression(
matcherSource, qs.getRegistryData(), &qs.namedValues, &diag);
if (!matcher) {
return makeInvalidQueryFromDiagnostics(diag);
}
auto actualSource = origMatcherSource.substr(0, origMatcherSource.size() -
matcherSource.size());
QueryRef query = new MatchQuery(actualSource, *matcher);
query->remainingContent = matcherSource;
return query;
}
case ParsedQueryKind::Invalid:
return new InvalidQuery("unknown command: " + commandStr);
}
llvm_unreachable("Invalid query kind");
}
QueryRef QueryParser::parse(llvm::StringRef line, const QuerySession &qs) {
return QueryParser(line, qs).doParse();
}
std::vector<llvm::LineEditor::Completion>
QueryParser::complete(llvm::StringRef line, size_t pos,
const QuerySession &qs) {
QueryParser queryParser(line, qs);
queryParser.completionPos = line.data() + pos;
queryParser.doParse();
return queryParser.completions;
}
} // namespace mlir::query
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