68 lines
2.1 KiB
C++
68 lines
2.1 KiB
C++
//===--- History.h - Previously Entered Lines -------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the interface for setting and retrieving previously
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// entered input, with a persistent backend (i.e. a history file).
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//
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// Axel Naumann <axel@cern.ch>, 2011-05-12
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//===----------------------------------------------------------------------===//
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#ifndef TEXTINPUT_HISTORY_H
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#define TEXTINPUT_HISTORY_H
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#include <cstddef>
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#include <string>
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#include <vector>
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namespace textinput {
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// Previous input lines.
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class History {
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public:
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enum {
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kPruneLengthDefault = -1 // Prune length equals 80% of fMaxDepth
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};
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History(const char* filename);
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~History();
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// If fMaxDepth == 0, do not create history output.
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void SetMaxDepth(size_t maxDepth) { fMaxDepth = maxDepth; }
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void SetPruneLength(size_t pruneLength = (size_t) kPruneLengthDefault) {
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fPruneLength = pruneLength; }
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// Indices are reverse! I.e. 0 is newest!
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const std::string& GetLine(size_t Idx) const {
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static const std::string sEmpty;
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if (Idx == (size_t)-1) return sEmpty;
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return fEntries[fEntries.size() - 1 - Idx];
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}
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size_t GetSize() const { return fEntries.size(); }
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size_t MatchIndex(size_t StartIdx, const char* regexp, size_t again = 0);
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void AddLine(const std::string& line);
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void ModifyLine(size_t Idx, const char* line) {
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fEntries[fEntries.size() - 1 - Idx] = line;
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// Does not sync to file!
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}
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void AppendToFile();
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void ReadFile(const char* FileName);
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private:
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std::string fHistFileName; // History file name
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size_t fMaxDepth; // Max number of entries before pruning
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size_t fPruneLength; // Remaining entries after pruning
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size_t fNumHistFileLines; // Hist file's number of lines at previous access
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std::vector<std::string> fEntries; // Previous input lines
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};
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}
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#endif //TEXTINPUT_HISTORY_H
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