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8d0f3364d8
* test cases for raw string literals * raw string literal implementation * match as block string if starting with triple ", and better error message for simple string except for *#"""#* * fix broken test case block string literal cannot be one line * test cases for raw string literals * raw string literal implementation * match as block string if starting with triple ", and better error message for simple string except for *#"""#* * fix broken test case block string literal cannot be one line * removed unused initial value * rename flag to indicate multi-line string and remove comment * use * to get value from std::optional * clean-ups * removed skip_scan flag and directly return in case of a single line string starting with #+\'\'\' * Updated error message: simple string -> single-line string. Co-authored-by: josh11b <josh11b@users.noreply.github.com> * Updated test cases according to changes in error message * Removed counting_hashtag flag. * Implemented ScanHelper class to handle scanning * Fixed explanation of ReadHashTags. * Addressed PR comment. * Clarify that scan_helper holds the source text. * Addressed PR comments. * Updated error messages in test cases. * Added const keyword to return type of GetCurrentStr(). * addressed PR comments. 1. Moved ScanHelper class to lex_scan_helper.h and lex_scan_helper.cpp. 2. Moved ReadHashTags and Process* functions to lex_scan_helper.cpp. Moved YY_USER_ACTION, SIMPLE_TOKEN and ARG_TOKEN to lex_helper.h. Added a wrapper function YyinputWrapper to call static function yyinput in lexer.lpp. 3. Renamed ScanHelper with StringLexHelper. 4. Modified BUILD accordingly. 5. Renamed data members and functions. * Addressed PR comments. 1. Adjusted order to keep ret usage close. 2. Used resize to construct the string to avoid creation of temp string. Co-authored-by: Jon Ross-Perkins <jperkins@google.com> * Removed the multi_line flag and skip_read field to improve readability. * Copied default parameter value to definition of UnescapeStringLiteral. Co-authored-by: Jon Ross-Perkins <jperkins@google.com> * Copied default parameter value to definition of ParseBlockStringLiteral. Co-authored-by: Jon Ross-Perkins <jperkins@google.com> * Prefix CARBON_ to SIMPLE_TOKEN and ARG_TOKEN macros. * Rollback redefinition of arguments. * Updated comment on the flex macro. Co-authored-by: Jon Ross-Perkins <jperkins@google.com> * Updated wording. Co-authored-by: Jon Ross-Perkins <jperkins@google.com> * Moved the EOF error out of the loop. * Removed duplicated declaration. * Changed type of `hashtag_num` and `leading_quotes` to int. * Minor fix: string copy. Co-authored-by: Jon Ross-Perkins <jperkins@google.com> * Added comment on YyinputWrapper. Co-authored-by: Jon Ross-Perkins <jperkins@google.com> * Garmmar in comment. Co-authored-by: Jon Ross-Perkins <jperkins@google.com> * Added check of eof before readling next char. * Minor updates based on PR comments. * Minor changes to address PR comments. * Used a clearer way to calculate `hashtag_num` and `leading_quotes`. Switched back to indicate muti-line string with a flag. * Directly copy StringRef for compilation error message. * Make str_with_quote const as we don't change it. Co-authored-by: josh11b <josh11b@users.noreply.github.com> * Added TODO for unsupported cases. * Fixed a typo. Co-authored-by: Jon Ross-Perkins <jperkins@google.com> Co-authored-by: josh11b <josh11b@users.noreply.github.com> Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
69 lines
2.2 KiB
C++
69 lines
2.2 KiB
C++
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#include "explorer/syntax/lex_scan_helper.h"
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#include "common/string_helpers.h"
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#include "explorer/syntax/lex_helper.h"
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#include "llvm/Support/FormatVariadic.h"
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namespace Carbon {
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auto StringLexHelper::Advance() -> bool {
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CARBON_CHECK(is_eof_ == false);
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const char c = YyinputWrapper(yyscanner_);
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if (c <= 0) {
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context_.RecordSyntaxError("Unexpected end of file");
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is_eof_ = true;
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return false;
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}
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str_.push_back(c);
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return true;
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}
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auto ReadHashTags(Carbon::StringLexHelper& scan_helper,
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const size_t hashtag_num) -> bool {
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for (size_t i = 0; i < hashtag_num; ++i) {
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if (!scan_helper.Advance() || scan_helper.last_char() != '#') {
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return false;
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}
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}
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return true;
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}
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auto ProcessSingleLineString(llvm::StringRef str,
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Carbon::ParseAndLexContext& context,
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const size_t hashtag_num)
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-> Carbon::Parser::symbol_type {
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std::string hashtags(hashtag_num, '#');
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const auto str_with_quote = str;
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CARBON_CHECK(str.consume_front(hashtags + "\"") &&
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str.consume_back("\"" + hashtags));
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std::optional<std::string> unescaped =
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Carbon::UnescapeStringLiteral(str, hashtag_num);
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if (unescaped == std::nullopt) {
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return context.RecordSyntaxError(
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llvm::formatv("Invalid escaping in string: {0}", str_with_quote));
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}
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return CARBON_ARG_TOKEN(string_literal, *unescaped);
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}
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auto ProcessMultiLineString(llvm::StringRef str,
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Carbon::ParseAndLexContext& context,
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const size_t hashtag_num)
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-> Carbon::Parser::symbol_type {
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std::string hashtags(hashtag_num, '#');
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CARBON_CHECK(str.consume_front(hashtags) && str.consume_back(hashtags));
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Carbon::ErrorOr<std::string> block_string =
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Carbon::ParseBlockStringLiteral(str, hashtag_num);
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if (!block_string.ok()) {
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return context.RecordSyntaxError(llvm::formatv(
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"Invalid block string: {0}", block_string.error().message()));
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}
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return CARBON_ARG_TOKEN(string_literal, *block_string);
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}
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} // namespace Carbon
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