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/*
* Copyright 2017 WebAssembly Community Group participants
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "src/error-handler.h"
#include <algorithm>
namespace wabt {
ErrorHandler::ErrorHandler(Location::Type location_type)
: location_type_(location_type) {}
ErrorHandler::ErrorHandler(Location::Type location_type,
std::unique_ptr<LexerSourceLineFinder> line_finder)
: location_type_(location_type), line_finder_(std::move(line_finder)) {}
bool ErrorHandler::OnError(ErrorLevel error_level,
const Location& loc,
const char* format,
va_list args) {
va_list args_copy;
va_copy(args_copy, args);
char fixed_buf[WABT_DEFAULT_SNPRINTF_ALLOCA_BUFSIZE];
char* buffer = fixed_buf;
size_t len = wabt_vsnprintf(fixed_buf, sizeof(fixed_buf), format, args);
if (len + 1 > sizeof(fixed_buf)) {
buffer = static_cast<char*>(alloca(len + 1));
len = wabt_vsnprintf(buffer, len + 1, format, args_copy);
}
LexerSourceLineFinder::SourceLine source_line;
if (line_finder_) {
Result result = line_finder_->GetSourceLine(loc, source_line_max_length(),
&source_line);
if (Failed(result)) {
// If this fails, it means that we've probably screwed up the lexer. Blow
// up.
WABT_FATAL("error getting the source line.\n");
}
}
return OnError(ErrorLevel::Error, loc, std::string(buffer), source_line.line,
source_line.column_offset);
}
std::string ErrorHandler::DefaultErrorMessage(ErrorLevel error_level,
const Color& color,
const Location& loc,
const std::string& error,
const std::string& source_line,
size_t source_line_column_offset,
int indent) {
std::string indent_str(indent, ' ');
std::string result = indent_str;
result += color.MaybeBoldCode();
if (!loc.filename.empty()) {
result += loc.filename.to_string();
result += ":";
}
if (location_type_ == Location::Type::Text) {
result += StringPrintf("%d:%d: ", loc.line, loc.first_column);
} else if (loc.offset != kInvalidOffset) {
result += StringPrintf("%07" PRIzx ": ", loc.offset);
}
result += color.MaybeRedCode();
result += GetErrorLevelName(error_level);
result += ": ";
result += color.MaybeDefaultCode();
result += error;
result += '\n';
if (!source_line.empty()) {
result += indent_str;
result += source_line;
result += '\n';
result += indent_str;
size_t num_spaces = (loc.first_column - 1) - source_line_column_offset;
size_t num_carets = loc.last_column - loc.first_column;
num_carets = std::min(num_carets, source_line.size() - num_spaces);
num_carets = std::max<size_t>(num_carets, 1);
result.append(num_spaces, ' ');
result += color.MaybeBoldCode();
result += color.MaybeGreenCode();
result.append(num_carets, '^');
result += color.MaybeDefaultCode();
result += '\n';
}
return result;
}
ErrorHandlerNop::ErrorHandlerNop()
// The Location::Type is irrelevant since we never display an error.
: ErrorHandler(Location::Type::Text) {}
ErrorHandlerFile::ErrorHandlerFile(
Location::Type location_type,
std::unique_ptr<LexerSourceLineFinder> line_finder,
FILE* file,
const std::string& header,
PrintHeader print_header,
size_t source_line_max_length)
: ErrorHandler(location_type, std::move(line_finder)),
file_(file),
header_(header),
print_header_(print_header),
source_line_max_length_(source_line_max_length),
color_(file) {}
bool ErrorHandlerFile::OnError(ErrorLevel level,
const Location& loc,
const std::string& error,
const std::string& source_line,
size_t source_line_column_offset) {
PrintErrorHeader();
int indent = header_.empty() ? 0 : 2;
std::string message =
DefaultErrorMessage(level, color_, loc, error, source_line,
source_line_column_offset, indent);
fwrite(message.data(), 1, message.size(), file_);
return true;
}
void ErrorHandlerFile::PrintErrorHeader() {
if (header_.empty()) {
return;
}
switch (print_header_) {
case PrintHeader::Never:
break;
case PrintHeader::Once:
print_header_ = PrintHeader::Never;
// Fallthrough.
case PrintHeader::Always:
fprintf(file_, "%s:\n", header_.c_str());
break;
}
}
ErrorHandlerBuffer::ErrorHandlerBuffer(
Location::Type location_type,
std::unique_ptr<LexerSourceLineFinder> line_finder,
size_t source_line_max_length)
: ErrorHandler(location_type, std::move(line_finder)),
source_line_max_length_(source_line_max_length),
color_(nullptr, false) {}
bool ErrorHandlerBuffer::OnError(ErrorLevel level,
const Location& loc,
const std::string& error,
const std::string& source_line,
size_t source_line_column_offset) {
buffer_ += DefaultErrorMessage(level, color_, loc, error, source_line,
source_line_column_offset, 0);
return true;
}
} // namespace wabt
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