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/*
* Copyright (C) 2015 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 <iostream>
#include <sstream>
#include "Scanner.h"
#include "Specification.h"
#include "Utilities.h"
using namespace std;
// Maximum of errors we'll report before bailing out.
const int MAX_ERRORS = 10;
Scanner::Scanner(const string& fileName, FILE* file)
: mFileName(fileName), mFile(file), mLineNumber(0), mTagConsumed(true), mErrorCount(0) {
}
bool Scanner::atEnd() {
return (mTagConsumed && feof(mFile)) || mErrorCount > MAX_ERRORS;
}
int Scanner::getChar() {
int c = fgetc(mFile);
if (c == '\n') {
mLineNumber++;
}
return c;
}
void Scanner::readUpTo(char delimiter, string* segment) {
for (;;) {
int c = getChar();
if (c == EOF || c == '\n') {
break;
}
segment->push_back((char)c);
if (c == delimiter) {
break;
}
}
}
void Scanner::readRestOfLine(string* segment) {
for (;;) {
int c = getChar();
if (c == EOF || c == '\n') {
return;
}
segment->push_back((char)c);
}
}
bool Scanner::getNextEntry() {
mTag.clear();
mValue.clear();
for (;;) {
int c = getChar();
if (c == EOF) {
return false;
}
if (c == '#') {
// Skip the comment
string comment;
readRestOfLine(&comment);
continue;
}
if (c == ' ') {
readRestOfLine(&mValue);
break;
} else if (c == '\n') {
break;
} else {
mTag = c;
readUpTo(':', &mTag);
readRestOfLine(&mValue);
trimSpaces(&mValue);
break;
}
}
return true;
}
ostream& Scanner::error() {
return error(mLineNumber);
}
ostream& Scanner::error(int lineNumber) {
if (++mErrorCount <= MAX_ERRORS) {
cerr << mFileName << ":" << lineNumber << ": error: ";
}
return cerr;
}
void Scanner::skipBlankEntries() {
while (findOptionalTag("")) {
if (!mValue.empty()) {
error() << "Unexpected: \" " << mValue << "\".\n";
}
}
}
bool Scanner::findTag(const char* tag) {
bool found = findOptionalTag(tag);
if (!found) {
error() << "Found \"" << mTag << "\" while looking for \"" << tag << "\".\n";
}
mTagConsumed = true;
return found;
}
bool Scanner::findOptionalTag(const char* tag) {
if (mTagConsumed) {
if (!getNextEntry()) {
return false;
}
}
mTagConsumed = (mTag == tag);
return mTagConsumed;
}
void Scanner::skipUntilTag(const char* tag) {
while(!findOptionalTag(tag)) {
mTagConsumed = true;
}
}
void Scanner::checkNoValue() {
if (!mValue.empty()) {
error() << "Did not expect \"" << mValue << "\" after \"" << mTag << "\".\n";
}
}
void Scanner::parseDocumentation(string* s, string* documentation) {
size_t docStart = s->find(", \"");
if (docStart == string::npos) {
documentation->erase();
} else {
size_t first = docStart + 3;
size_t last = s->find('\"', first);
if (last == string::npos) {
error() << "Missing closing double quote\n";
}
*documentation = s->substr(first, last - first);
s->erase(docStart);
}
}
ParameterEntry* Scanner::parseArgString(bool isReturn) {
string s = mValue;
ParameterEntry* p = new ParameterEntry();
parseDocumentation(&s, &p->documentation);
size_t optionStart = s.find(", ");
if (optionStart != string::npos) {
p->testOption = s.substr(optionStart + 2);
s.erase(optionStart);
}
trimSpaces(&s);
if (!isReturn) {
size_t nameStart = s.rfind(' ');
if (nameStart == string::npos) {
error() << "Missing variable name\n";
} else {
p->name = s.substr(nameStart + 1);
s.erase(nameStart);
if (p->name.find('*') != string::npos) {
error() << "The '*' should be attached to the type\n";
}
}
}
if (s == "void" && !isReturn) {
error() << "void is only allowed for ret:\n";
}
p->type = s;
p->lineNumber = mLineNumber;
return p;
}
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