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05363cd55a
- Frontend: Implicitly import `_StringProcessing` when frontend flag `-enable-experimental-string-processing` is set. - Type checker: Set a regex literal expression's type as `_StringProcessing.Regex<(Substring, DynamicCaptures)>`. `(Substring, DynamicCaptures)` is a temporary `Match` type that will help get us to an end-to-end working system. This will be replaced by actual type inference based a regex's pattern in a follow-up patch (soon). - SILGen: Lower a regex literal expression to a call to `_StringProcessing.Regex.init(_regexString:)`. - String processing runtime: Add `Regex`, `DynamicCaptures` (matching actual APIs in apple/swift-experimental-string-processing), and `Regex(_regexString:)`. Upcoming: - Build `_MatchingEngine` and `_StringProcessing` modules with sources from apple/swift-experimental-string-processing. - Replace `DynamicCaptures` with inferred capture types.
60 lines
2.1 KiB
C++
60 lines
2.1 KiB
C++
//===--- ParseRegex.cpp - Regular expression literal parsing --------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2021 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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//
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// Regular expression literal parsing
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//
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//===----------------------------------------------------------------------===//
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#include "swift/Parse/Parser.h"
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#include "swift/AST/DiagnosticsParse.h"
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#include "swift/Parse/ParsedSyntaxRecorder.h"
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#include "swift/Parse/SyntaxParsingContext.h"
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#include "swift/Syntax/SyntaxKind.h"
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// Regex parser delivered via libSwift
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#include "swift/Parse/ExperimentalRegexBridging.h"
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static ParseRegexStrawperson parseRegexStrawperson = nullptr;
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void Parser_registerParseRegexStrawperson(ParseRegexStrawperson fn) {
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parseRegexStrawperson = fn;
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}
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// Exposes the presence of the regex parsing function to the lexer.
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bool Parser_hasParseRegexStrawperson() {
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return parseRegexStrawperson != nullptr;
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}
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using namespace swift;
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using namespace swift::syntax;
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ParserResult<Expr> Parser::parseExprRegexLiteral() {
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assert(Tok.is(tok::regex_literal));
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assert(parseRegexStrawperson);
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SyntaxParsingContext LocalContext(SyntaxContext,
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SyntaxKind::RegexLiteralExpr);
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// Strip off delimiters.
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auto rawText = Tok.getText();
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assert(rawText.front() == '\'' && rawText.back() == '\'');
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auto regexText = rawText.slice(1, rawText.size() - 1);
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// Let the Swift library parse the contents, returning an error, or null if
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// successful.
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// TODO: We need to be able to pass back a source location to emit the error
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// at.
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auto *errorStr = parseRegexStrawperson(regexText.str().c_str());
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if (errorStr)
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diagnose(Tok, diag::regex_literal_parsing_error, errorStr);
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auto loc = consumeToken();
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return makeParserResult(
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RegexLiteralExpr::createParsed(Context, loc, regexText));
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}
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