You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
85 lines
2.4 KiB
85 lines
2.4 KiB
//===- CodeExpander.cpp - Expand variables in a string --------------------===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
/// \file Expand the variables in a string.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "CodeExpander.h"
|
|
#include "CodeExpansions.h"
|
|
#include "llvm/Support/CommandLine.h"
|
|
#include "llvm/Support/raw_ostream.h"
|
|
#include "llvm/TableGen/Error.h"
|
|
|
|
using namespace llvm;
|
|
|
|
void CodeExpander::emit(raw_ostream &OS) const {
|
|
StringRef Current = Code;
|
|
|
|
while (!Current.empty()) {
|
|
size_t Pos = Current.find_first_of("$\n\\");
|
|
if (Pos == StringRef::npos) {
|
|
OS << Current;
|
|
Current = "";
|
|
continue;
|
|
}
|
|
|
|
OS << Current.substr(0, Pos);
|
|
Current = Current.substr(Pos);
|
|
|
|
if (Current.startswith("\n")) {
|
|
OS << "\n" << Indent;
|
|
Current = Current.drop_front(1);
|
|
continue;
|
|
}
|
|
|
|
if (Current.startswith("\\$") || Current.startswith("\\\\")) {
|
|
OS << Current[1];
|
|
Current = Current.drop_front(2);
|
|
continue;
|
|
}
|
|
|
|
if (Current.startswith("\\")) {
|
|
Current = Current.drop_front(1);
|
|
continue;
|
|
}
|
|
|
|
if (Current.startswith("${")) {
|
|
StringRef StartVar = Current;
|
|
Current = Current.drop_front(2);
|
|
StringRef Var;
|
|
std::tie(Var, Current) = Current.split("}");
|
|
|
|
// Warn if we split because no terminator was found.
|
|
StringRef EndVar = StartVar.drop_front(2 /* ${ */ + Var.size());
|
|
if (EndVar.empty()) {
|
|
PrintWarning(Loc, "Unterminated expansion '${" + Var + "'");
|
|
PrintNote("Code: [{" + Code + "}]");
|
|
}
|
|
|
|
auto ValueI = Expansions.find(Var);
|
|
if (ValueI == Expansions.end()) {
|
|
PrintError(Loc,
|
|
"Attempt to expand an undeclared variable '" + Var + "'");
|
|
PrintNote("Code: [{" + Code + "}]");
|
|
}
|
|
if (ShowExpansions)
|
|
OS << "/*$" << Var << "{*/";
|
|
OS << Expansions.lookup(Var);
|
|
if (ShowExpansions)
|
|
OS << "/*}*/";
|
|
continue;
|
|
}
|
|
|
|
PrintWarning(Loc, "Assuming missing escape character: \\$");
|
|
PrintNote("Code: [{" + Code + "}]");
|
|
OS << "$";
|
|
Current = Current.drop_front(1);
|
|
}
|
|
}
|