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/*
* Copyright 2014 The Android Open Source Project
*
* 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 "Parser.h"
#include <vector>
#define WHITESPACE " \t\n"
// Parse the |input| string as a list of type-specific tokens.
// This tokenizes the input, using whitespace as separators and '*' as
// a single token too. On success, return true and sets |*out| to the
// list of tokens. On failure, return false.
//
// Example: 'const char**foo' -> ['const', 'char', '*', '*', 'foo']
//
static bool parseTypeTokens(const std::string& input,
std::vector<std::string>* out,
std::string* error) {
out->clear();
size_t pos = 0U;
// Parse all tokens in the input, treat '*' as a single token.
// I.e.
for (;;) {
// skip leading whitespace.
pos = input.find_first_not_of(WHITESPACE, pos);
if (pos == std::string::npos) {
break; // end of parse.
}
// If this is a star, ensure it follows a type name.
// otherwise treat it as part of the final type.
if (input[pos] == '*') {
out->push_back(std::string("*"));
pos += 1U;
continue;
}
// find end of type/token.
size_t end = input.find_first_of(WHITESPACE "*", pos);
if (end == std::string::npos) {
end = input.size();
}
std::string str = input.substr(pos, end - pos);
if (str.size() == 0) {
// Sanity check: should not happen.
if (error != NULL) {
*error = "Unexpected empty token !?";
}
return false;
}
out->push_back(str);
pos = end;
}
if (error != NULL) {
// Sanity check: require non-empty input
if (out->empty()) {
*error = "Empty parameter declaration!";
return false;
}
// Sanity check: There must be base type name before any '*'
for (size_t n = 0; n < out->size(); ++n) {
std::string& token = (*out)[n];
if (token == "*") {
*error = "Unexpected '*' before type name";
return false;
} else if (token != "const") {
break;
}
}
}
return true;
}
// Given |tokens|, an input vector of strings, join the first |count| items
// into a normalized type string, and return it.
static std::string buildTypeString(const std::vector<std::string>& tokens,
size_t count) {
std::string result;
for (size_t n = 0; n < count; ++n) {
const std::string& token = tokens[n];
if (n > 0 && token != "*") {
result.append(" ");
}
result.append(token);
}
return result;
}
std::string normalizeTypeDeclaration(const std::string& input) {
std::vector<std::string> tokens;
if (!parseTypeTokens(input, &tokens, NULL)) {
return "";
}
return buildTypeString(tokens, tokens.size());
}
bool parseTypeDeclaration(const std::string& input,
std::string* typeName,
std::string* error) {
// The type name can be made of several tokens, e.g. 'unsigned int'
// use an array to store them, and a count variable. Each item can be
// one of '*', 'const' or a type name component (e.g. 'struct', 'unsigned')
std::vector<std::string> tokens;
if (!parseTypeTokens(input, &tokens, error)) {
return false;
}
// Sanity check, there must be a least one non-special tokens.
size_t nonSpecialCount = 0;
for (size_t n = 0; n < tokens.size(); ++n) {
if (tokens[n] != "*" && tokens[n] != "const") {
nonSpecialCount++;
}
}
if (nonSpecialCount == 0) {
*error = "Missing type name";
return false;
}
// Build the type name from all tokens before it.
*typeName = buildTypeString(tokens, tokens.size());
return true;
}
bool parseParameterDeclaration(const std::string& param,
std::string* typeName,
std::string* variableName,
std::string* error) {
std::vector<std::string> tokens;
if (!parseTypeTokens(param, &tokens, error)) {
return false;
}
// Sanity check, there must be a least two non-special tokens.
size_t nonSpecialCount = 0;
for (size_t n = 0; n < tokens.size(); ++n) {
if (tokens[n] != "*" && tokens[n] != "const") {
nonSpecialCount++;
}
}
if (nonSpecialCount == 0) {
*error = "Missing type name";
return false;
}
if (nonSpecialCount == 1) {
*error = "Missing variable name";
return false;
}
// Sanity check: variable name must not be followed by 'const' or '*'
const std::string& lastToken = tokens[tokens.size() - 1U];
if (lastToken == "*") {
*error = "Extra '*' after variable name";
return false;
}
if (lastToken == "const") {
*error = "Extra 'const' after variable name";
return false;
}
// Extract the variable name as the last token.
if (variableName) {
*variableName = lastToken;
}
// Build the type name from all tokens before it.
*typeName = buildTypeString(tokens, tokens.size() - 1U);
return true;
}
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