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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 "source-error-handler.h"
#include <algorithm>
namespace wabt {
std::string SourceErrorHandler::DefaultErrorMessage(
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 =
string_printf("%s%s:%d:%d: %s\n", indent_str.c_str(), loc->filename,
loc->line, loc->first_column, error.c_str());
result += indent_str;
if (!source_line.empty()) {
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.append(num_carets, '^');
result += '\n';
}
return result;
}
SourceErrorHandlerFile::SourceErrorHandlerFile(FILE* file,
const std::string& header,
PrintHeader print_header,
size_t source_line_max_length)
: file_(file),
header_(header),
print_header_(print_header),
source_line_max_length_(source_line_max_length) {}
bool SourceErrorHandlerFile::OnError(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(loc, error, source_line,
source_line_column_offset, indent);
fwrite(message.data(), 1, message.size(), file_);
return true;
}
void SourceErrorHandlerFile::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;
}
}
SourceErrorHandlerBuffer::SourceErrorHandlerBuffer(
size_t source_line_max_length)
: source_line_max_length_(source_line_max_length) {}
bool SourceErrorHandlerBuffer::OnError(const Location* loc,
const std::string& error,
const std::string& source_line,
size_t source_line_column_offset) {
buffer_ += DefaultErrorMessage(loc, error, source_line,
source_line_column_offset, 0);
return true;
}
} // namespace wabt
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