85 lines
2.4 KiB
C++
85 lines
2.4 KiB
C++
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//===- CodeExpander.cpp - Expand variables in a string --------------------===//
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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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//
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/// \file Expand the variables in a string.
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//
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//===----------------------------------------------------------------------===//
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#include "CodeExpander.h"
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#include "CodeExpansions.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/TableGen/Error.h"
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using namespace llvm;
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void CodeExpander::emit(raw_ostream &OS) const {
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StringRef Current = Code;
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while (!Current.empty()) {
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size_t Pos = Current.find_first_of("$\n\\");
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if (Pos == StringRef::npos) {
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OS << Current;
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Current = "";
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continue;
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}
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OS << Current.substr(0, Pos);
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Current = Current.substr(Pos);
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if (Current.startswith("\n")) {
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OS << "\n" << Indent;
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Current = Current.drop_front(1);
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continue;
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}
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if (Current.startswith("\\$") || Current.startswith("\\\\")) {
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OS << Current[1];
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Current = Current.drop_front(2);
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continue;
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}
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if (Current.startswith("\\")) {
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Current = Current.drop_front(1);
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continue;
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}
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if (Current.startswith("${")) {
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StringRef StartVar = Current;
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Current = Current.drop_front(2);
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StringRef Var;
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std::tie(Var, Current) = Current.split("}");
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// Warn if we split because no terminator was found.
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StringRef EndVar = StartVar.drop_front(2 /* ${ */ + Var.size());
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if (EndVar.empty()) {
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PrintWarning(Loc, "Unterminated expansion '${" + Var + "'");
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PrintNote("Code: [{" + Code + "}]");
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}
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auto ValueI = Expansions.find(Var);
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if (ValueI == Expansions.end()) {
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PrintError(Loc,
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"Attempt to expand an undeclared variable '" + Var + "'");
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PrintNote("Code: [{" + Code + "}]");
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}
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if (ShowExpansions)
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OS << "/*$" << Var << "{*/";
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OS << Expansions.lookup(Var);
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if (ShowExpansions)
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OS << "/*}*/";
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continue;
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}
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PrintWarning(Loc, "Assuming missing escape character: \\$");
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PrintNote("Code: [{" + Code + "}]");
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OS << "$";
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Current = Current.drop_front(1);
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}
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}
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