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// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.
// http://code.google.com/p/protobuf/
//
// 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.
// Author: kenton@google.com (Kenton Varda)
// Based on original Protocol Buffers design by
// Sanjay Ghemawat, Jeff Dean, and others.
#include <google/protobuf/io/printer.h>
#include <google/protobuf/io/zero_copy_stream.h>
#include <google/protobuf/stubs/common.h>
#include <google/protobuf/stubs/strutil.h>
namespace google {
namespace protobuf {
namespace io {
Printer::Printer(ZeroCopyOutputStream* output, char variable_delimiter)
: variable_delimiter_(variable_delimiter),
output_(output),
buffer_(NULL),
buffer_size_(0),
at_start_of_line_(true),
failed_(false) {
}
Printer::~Printer() {
// Only BackUp() if we're sure we've successfully called Next() at least once.
if (buffer_size_ > 0) {
output_->BackUp(buffer_size_);
}
}
void Printer::Print(const map<string, string>& variables, const char* text) {
int size = strlen(text);
int pos = 0; // The number of bytes we've written so far.
for (int i = 0; i < size; i++) {
if (text[i] == '\n') {
// Saw newline. If there is more text, we may need to insert an indent
// here. So, write what we have so far, including the '\n'.
Write(text + pos, i - pos + 1);
pos = i + 1;
// Setting this true will cause the next Write() to insert an indent
// first.
at_start_of_line_ = true;
} else if (text[i] == variable_delimiter_) {
// Saw the start of a variable name.
// Write what we have so far.
Write(text + pos, i - pos);
pos = i + 1;
// Find closing delimiter.
const char* end = strchr(text + pos, variable_delimiter_);
if (end == NULL) {
GOOGLE_LOG(DFATAL) << " Unclosed variable name.";
end = text + pos;
}
int endpos = end - text;
string varname(text + pos, endpos - pos);
if (varname.empty()) {
// Two delimiters in a row reduce to a literal delimiter character.
Write(&variable_delimiter_, 1);
} else {
// Replace with the variable's value.
map<string, string>::const_iterator iter = variables.find(varname);
if (iter == variables.end()) {
GOOGLE_LOG(DFATAL) << " Undefined variable: " << varname;
} else {
Write(iter->second.data(), iter->second.size());
}
}
// Advance past this variable.
i = endpos;
pos = endpos + 1;
}
}
// Write the rest.
Write(text + pos, size - pos);
}
void Printer::Print(const char* text) {
static map<string, string> empty;
Print(empty, text);
}
void Printer::Print(const char* text,
const char* variable, const string& value) {
map<string, string> vars;
vars[variable] = value;
Print(vars, text);
}
void Printer::Print(const char* text,
const char* variable1, const string& value1,
const char* variable2, const string& value2) {
map<string, string> vars;
vars[variable1] = value1;
vars[variable2] = value2;
Print(vars, text);
}
void Printer::Indent() {
indent_ += " ";
}
void Printer::Outdent() {
if (indent_.empty()) {
GOOGLE_LOG(DFATAL) << " Outdent() without matching Indent().";
return;
}
indent_.resize(indent_.size() - 2);
}
void Printer::Write(const char* data, int size) {
if (failed_) return;
if (size == 0) return;
if (at_start_of_line_) {
// Insert an indent.
at_start_of_line_ = false;
Write(indent_.data(), indent_.size());
if (failed_) return;
}
while (size > buffer_size_) {
// Data exceeds space in the buffer. Copy what we can and request a
// new buffer.
memcpy(buffer_, data, buffer_size_);
data += buffer_size_;
size -= buffer_size_;
void* void_buffer;
failed_ = !output_->Next(&void_buffer, &buffer_size_);
if (failed_) return;
buffer_ = reinterpret_cast<char*>(void_buffer);
}
// Buffer is big enough to receive the data; copy it.
memcpy(buffer_, data, size);
buffer_ += size;
buffer_size_ -= size;
}
} // namespace io
} // namespace protobuf
} // namespace google
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