e7823608bc
When processing the devious NAMELIST input
&group logarray = t t t
= 666 /
for LOGICAL::logarray(3) and INTEGER::t, the runtime library
needs to do some look-ahead on the input stream to make sure
that the last "t" on the first line is a truth value rather than
an item name -- which in this case it is. This look-ahead
was implemented in a previous patch but only worked for internal
input cases; this patch implements look-ahead capabilities for
input from an external file, too (and also adjusts repeated
list-directed input items to use this infrastructure, too).
Differential Revision: https://reviews.llvm.org/D113311
55 lines
1.8 KiB
C++
55 lines
1.8 KiB
C++
//===-- runtime/connection.cpp --------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "connection.h"
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#include "environment.h"
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#include "io-stmt.h"
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#include <algorithm>
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namespace Fortran::runtime::io {
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std::size_t ConnectionState::RemainingSpaceInRecord() const {
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auto recl{recordLength.value_or(
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executionEnvironment.listDirectedOutputLineLengthLimit)};
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return positionInRecord >= recl ? 0 : recl - positionInRecord;
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}
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bool ConnectionState::NeedAdvance(std::size_t width) const {
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return positionInRecord > 0 && width > RemainingSpaceInRecord();
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}
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bool ConnectionState::IsAtEOF() const {
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return endfileRecordNumber && currentRecordNumber >= *endfileRecordNumber;
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}
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void ConnectionState::HandleAbsolutePosition(std::int64_t n) {
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positionInRecord = std::max(n, std::int64_t{0}) + leftTabLimit.value_or(0);
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}
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void ConnectionState::HandleRelativePosition(std::int64_t n) {
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positionInRecord = std::max(leftTabLimit.value_or(0), positionInRecord + n);
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}
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SavedPosition::SavedPosition(IoStatementState &io) : io_{io} {
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ConnectionState &conn{io_.GetConnectionState()};
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saved_ = conn;
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conn.pinnedFrame = true;
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}
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SavedPosition::~SavedPosition() {
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ConnectionState &conn{io_.GetConnectionState()};
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while (conn.currentRecordNumber > saved_.currentRecordNumber) {
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io_.BackspaceRecord();
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}
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conn.leftTabLimit = saved_.leftTabLimit;
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conn.furthestPositionInRecord = saved_.furthestPositionInRecord;
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conn.positionInRecord = saved_.positionInRecord;
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conn.pinnedFrame = saved_.pinnedFrame;
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}
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} // namespace Fortran::runtime::io
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