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//===--- ParseRegex.cpp - Regular expression literal parsing --------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2021 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
//
// Regular expression literal parsing
//
//===----------------------------------------------------------------------===//
#include "swift/AST/DiagnosticsParse.h"
#include "swift/Bridging/ASTGen.h"
#include "swift/Parse/Parser.h"
using namespace swift;
ParserResult<Expr> Parser::parseExprRegexLiteral() {
assert(Tok.is(tok::regex_literal));
#if SWIFT_BUILD_REGEX_PARSER_IN_COMPILER
auto regexText = Tok.getText();
// Let the Swift library parse the contents, returning an error, or null if
// successful.
size_t version = 0;
auto capturesBuf = Context.AllocateUninitialized<uint8_t>(
RegexLiteralExpr::getCaptureStructureSerializationAllocationSize(
regexText.size()));
bool hadError = swift_ASTGen_parseRegexLiteral(
regexText,
/*versionOut=*/&version,
/*captureStructureOut=*/capturesBuf.data(),
/*captureStructureSize=*/capturesBuf.size(),
/*diagBaseLoc=*/Tok.getLoc(), &Diags);
auto loc = consumeToken();
SourceMgr.recordRegexLiteralStartLoc(loc);
if (hadError) {
return makeParserResult(new (Context) ErrorExpr(loc));
}
assert(version >= 1);
return makeParserResult(RegexLiteralExpr::createParsed(
Context, loc, regexText, version, capturesBuf));
#else
llvm_unreachable("Lexer should not emit tok::regex_literal");
#endif
}
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