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external/llvm/lib/LineEditor/LineEditor.cpp
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external/llvm/lib/LineEditor/LineEditor.cpp
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//===-- LineEditor.cpp - line editor --------------------------------------===//
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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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#include "llvm/LineEditor/LineEditor.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/Config/config.h"
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#include "llvm/Support/Path.h"
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#include "llvm/Support/raw_ostream.h"
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#include <algorithm>
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#include <cassert>
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#include <cstdio>
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#ifdef HAVE_LIBEDIT
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#include <histedit.h>
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#endif
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using namespace llvm;
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std::string LineEditor::getDefaultHistoryPath(StringRef ProgName) {
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SmallString<32> Path;
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if (sys::path::home_directory(Path)) {
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sys::path::append(Path, "." + ProgName + "-history");
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return Path.str();
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}
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return std::string();
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}
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LineEditor::CompleterConcept::~CompleterConcept() {}
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LineEditor::ListCompleterConcept::~ListCompleterConcept() {}
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std::string LineEditor::ListCompleterConcept::getCommonPrefix(
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const std::vector<Completion> &Comps) {
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assert(!Comps.empty());
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std::string CommonPrefix = Comps[0].TypedText;
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for (std::vector<Completion>::const_iterator I = Comps.begin() + 1,
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E = Comps.end();
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I != E; ++I) {
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size_t Len = std::min(CommonPrefix.size(), I->TypedText.size());
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size_t CommonLen = 0;
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for (; CommonLen != Len; ++CommonLen) {
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if (CommonPrefix[CommonLen] != I->TypedText[CommonLen])
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break;
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}
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CommonPrefix.resize(CommonLen);
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}
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return CommonPrefix;
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}
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LineEditor::CompletionAction
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LineEditor::ListCompleterConcept::complete(StringRef Buffer, size_t Pos) const {
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CompletionAction Action;
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std::vector<Completion> Comps = getCompletions(Buffer, Pos);
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if (Comps.empty()) {
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Action.Kind = CompletionAction::AK_ShowCompletions;
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return Action;
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}
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std::string CommonPrefix = getCommonPrefix(Comps);
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// If the common prefix is non-empty we can simply insert it. If there is a
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// single completion, this will insert the full completion. If there is more
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// than one, this might be enough information to jog the user's memory but if
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// not the user can also hit tab again to see the completions because the
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// common prefix will then be empty.
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if (CommonPrefix.empty()) {
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Action.Kind = CompletionAction::AK_ShowCompletions;
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for (std::vector<Completion>::iterator I = Comps.begin(), E = Comps.end();
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I != E; ++I)
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Action.Completions.push_back(I->DisplayText);
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} else {
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Action.Kind = CompletionAction::AK_Insert;
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Action.Text = CommonPrefix;
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}
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return Action;
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}
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LineEditor::CompletionAction LineEditor::getCompletionAction(StringRef Buffer,
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size_t Pos) const {
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if (!Completer) {
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CompletionAction Action;
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Action.Kind = CompletionAction::AK_ShowCompletions;
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return Action;
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}
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return Completer->complete(Buffer, Pos);
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}
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#ifdef HAVE_LIBEDIT
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// libedit-based implementation.
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struct LineEditor::InternalData {
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LineEditor *LE;
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History *Hist;
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EditLine *EL;
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unsigned PrevCount;
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std::string ContinuationOutput;
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FILE *Out;
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};
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namespace {
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const char *ElGetPromptFn(EditLine *EL) {
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LineEditor::InternalData *Data;
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if (el_get(EL, EL_CLIENTDATA, &Data) == 0)
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return Data->LE->getPrompt().c_str();
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return "> ";
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}
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// Handles tab completion.
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//
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// This function is really horrible. But since the alternative is to get into
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// the line editor business, here we are.
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unsigned char ElCompletionFn(EditLine *EL, int ch) {
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LineEditor::InternalData *Data;
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if (el_get(EL, EL_CLIENTDATA, &Data) == 0) {
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if (!Data->ContinuationOutput.empty()) {
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// This is the continuation of the AK_ShowCompletions branch below.
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FILE *Out = Data->Out;
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// Print the required output (see below).
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::fwrite(Data->ContinuationOutput.c_str(),
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Data->ContinuationOutput.size(), 1, Out);
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// Push a sequence of Ctrl-B characters to move the cursor back to its
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// original position.
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std::string Prevs(Data->PrevCount, '\02');
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::el_push(EL, const_cast<char *>(Prevs.c_str()));
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Data->ContinuationOutput.clear();
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return CC_REFRESH;
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}
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const LineInfo *LI = ::el_line(EL);
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LineEditor::CompletionAction Action = Data->LE->getCompletionAction(
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StringRef(LI->buffer, LI->lastchar - LI->buffer),
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LI->cursor - LI->buffer);
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switch (Action.Kind) {
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case LineEditor::CompletionAction::AK_Insert:
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::el_insertstr(EL, Action.Text.c_str());
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return CC_REFRESH;
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case LineEditor::CompletionAction::AK_ShowCompletions:
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if (Action.Completions.empty()) {
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return CC_REFRESH_BEEP;
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} else {
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// Push a Ctrl-E and a tab. The Ctrl-E causes libedit to move the cursor
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// to the end of the line, so that when we emit a newline we will be on
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// a new blank line. The tab causes libedit to call this function again
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// after moving the cursor. There doesn't seem to be anything we can do
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// from here to cause libedit to move the cursor immediately. This will
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// break horribly if the user has rebound their keys, so for now we do
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// not permit user rebinding.
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::el_push(EL, const_cast<char *>("\05\t"));
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// This assembles the output for the continuation block above.
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raw_string_ostream OS(Data->ContinuationOutput);
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// Move cursor to a blank line.
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OS << "\n";
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// Emit the completions.
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for (std::vector<std::string>::iterator I = Action.Completions.begin(),
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E = Action.Completions.end();
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I != E; ++I) {
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OS << *I << "\n";
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}
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// Fool libedit into thinking nothing has changed. Reprint its prompt
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// and the user input. Note that the cursor will remain at the end of
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// the line after this.
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OS << Data->LE->getPrompt()
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<< StringRef(LI->buffer, LI->lastchar - LI->buffer);
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// This is the number of characters we need to tell libedit to go back:
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// the distance between end of line and the original cursor position.
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Data->PrevCount = LI->lastchar - LI->cursor;
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return CC_REFRESH;
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}
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}
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}
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return CC_ERROR;
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}
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} // end anonymous namespace
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LineEditor::LineEditor(StringRef ProgName, StringRef HistoryPath, FILE *In,
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FILE *Out, FILE *Err)
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: Prompt((ProgName + "> ").str()), HistoryPath(HistoryPath),
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Data(new InternalData) {
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if (HistoryPath.empty())
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this->HistoryPath = getDefaultHistoryPath(ProgName);
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Data->LE = this;
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Data->Out = Out;
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Data->Hist = ::history_init();
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assert(Data->Hist);
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Data->EL = ::el_init(ProgName.str().c_str(), In, Out, Err);
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assert(Data->EL);
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::el_set(Data->EL, EL_PROMPT, ElGetPromptFn);
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::el_set(Data->EL, EL_EDITOR, "emacs");
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::el_set(Data->EL, EL_HIST, history, Data->Hist);
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::el_set(Data->EL, EL_ADDFN, "tab_complete", "Tab completion function",
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ElCompletionFn);
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::el_set(Data->EL, EL_BIND, "\t", "tab_complete", NULL);
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::el_set(Data->EL, EL_BIND, "^r", "em-inc-search-prev",
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NULL); // Cycle through backwards search, entering string
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::el_set(Data->EL, EL_BIND, "^w", "ed-delete-prev-word",
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NULL); // Delete previous word, behave like bash does.
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::el_set(Data->EL, EL_BIND, "\033[3~", "ed-delete-next-char",
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NULL); // Fix the delete key.
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::el_set(Data->EL, EL_CLIENTDATA, Data.get());
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HistEvent HE;
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::history(Data->Hist, &HE, H_SETSIZE, 800);
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::history(Data->Hist, &HE, H_SETUNIQUE, 1);
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loadHistory();
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}
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LineEditor::~LineEditor() {
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saveHistory();
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::history_end(Data->Hist);
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::el_end(Data->EL);
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::fwrite("\n", 1, 1, Data->Out);
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}
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void LineEditor::saveHistory() {
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if (!HistoryPath.empty()) {
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HistEvent HE;
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::history(Data->Hist, &HE, H_SAVE, HistoryPath.c_str());
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}
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}
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void LineEditor::loadHistory() {
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if (!HistoryPath.empty()) {
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HistEvent HE;
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::history(Data->Hist, &HE, H_LOAD, HistoryPath.c_str());
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}
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}
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Optional<std::string> LineEditor::readLine() const {
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// Call el_gets to prompt the user and read the user's input.
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int LineLen = 0;
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const char *Line = ::el_gets(Data->EL, &LineLen);
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// Either of these may mean end-of-file.
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if (!Line || LineLen == 0)
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return Optional<std::string>();
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// Strip any newlines off the end of the string.
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while (LineLen > 0 &&
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(Line[LineLen - 1] == '\n' || Line[LineLen - 1] == '\r'))
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--LineLen;
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HistEvent HE;
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if (LineLen > 0)
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::history(Data->Hist, &HE, H_ENTER, Line);
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return std::string(Line, LineLen);
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}
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#else // HAVE_LIBEDIT
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// Simple fgets-based implementation.
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struct LineEditor::InternalData {
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FILE *In;
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FILE *Out;
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};
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LineEditor::LineEditor(StringRef ProgName, StringRef HistoryPath, FILE *In,
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FILE *Out, FILE *Err)
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: Prompt((ProgName + "> ").str()), Data(new InternalData) {
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Data->In = In;
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Data->Out = Out;
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}
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LineEditor::~LineEditor() {
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::fwrite("\n", 1, 1, Data->Out);
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}
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void LineEditor::saveHistory() {}
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void LineEditor::loadHistory() {}
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Optional<std::string> LineEditor::readLine() const {
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::fprintf(Data->Out, "%s", Prompt.c_str());
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std::string Line;
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do {
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char Buf[64];
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char *Res = ::fgets(Buf, sizeof(Buf), Data->In);
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if (!Res) {
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if (Line.empty())
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return Optional<std::string>();
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else
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return Line;
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}
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Line.append(Buf);
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} while (Line.empty() ||
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(Line[Line.size() - 1] != '\n' && Line[Line.size() - 1] != '\r'));
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while (!Line.empty() &&
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(Line[Line.size() - 1] == '\n' || Line[Line.size() - 1] == '\r'))
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Line.resize(Line.size() - 1);
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return Line;
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}
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#endif // HAVE_LIBEDIT
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