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Copy pathlexer.h
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135 lines (120 loc) · 3.52 KB
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/*
* Copyright (c) 2015 PLUMgrid, Inc.
*
* 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.
*/
#pragma once
#ifndef yyFlexLexerOnce
#undef yyFlexLexer
#define yyFlexLexer ebpfccFlexLexer
#include <FlexLexer.h>
#endif
#undef YY_DECL
#define YY_DECL int ebpf::cc::Lexer::yylex()
#include <iostream> // NOLINT
#include <list>
#include "parser.yy.hh"
namespace ebpf {
namespace cc {
typedef BisonParser::token::yytokentype Tok;
class Lexer : public yyFlexLexer {
public:
explicit Lexer(std::istream* in)
: yyFlexLexer(in), prev_tok_(Tok::TSEMI), lines_({""}), yylval_(NULL), yylloc_(NULL) {
if (!in || !*in)
fprintf(stderr, "Unable to open input stream\n");
}
int yylex(BisonParser::semantic_type *lval, BisonParser::location_type *lloc) {
yylval_ = lval;
yylloc_ = lloc;
return yylex();
}
std::string text(const BisonParser::location_type& loc) const {
return text(loc.begin, loc.end);
}
std::string text(const position& begin, const position& end) const {
std::string result;
for (size_t i = begin.line; i <= end.line; ++i) {
if (i == begin.line && i == end.line) {
result += lines_.at(i - 1).substr(begin.column - 1, end.column - begin.column);
} else if (i == begin.line && i < end.line) {
result += lines_.at(i - 1).substr(begin.column - 1);
} else if (i > begin.line && i == end.line) {
result += lines_.at(i - 1).substr(0, end.column);
} else if (i > begin.line && i == end.line) {
result += lines_.at(i - 1);
}
}
return result;
}
private:
// true if a semicolon should be replaced here
bool next_line() {
lines_.push_back("");
yylloc_->lines();
yylloc_->step();
switch (prev_tok_) {
case Tok::TIDENTIFIER:
case Tok::TINTEGER:
case Tok::THEXINTEGER:
case Tok::TRBRACE:
case Tok::TRPAREN:
case Tok::TRBRACK:
case Tok::TTRUE:
case Tok::TFALSE:
// uncomment to add implicit semicolons
//return true;
default:
break;
}
return false;
}
Tok save(Tok tok, bool ignore_text = false) {
if (!ignore_text) {
save_text();
}
switch (tok) {
case Tok::TIDENTIFIER:
case Tok::TINTEGER:
case Tok::THEXINTEGER:
yylval_->string = new std::string(yytext, yyleng);
break;
default:
yylval_->token = tok;
}
prev_tok_ = tok;
return tok;
}
/*
std::string * alloc_string(const char *c, size_t len) {
strings_.push_back(std::unique_ptr<std::string>(new std::string(c, len)));
return strings_.back().get();
}
std::string * alloc_string(const std::string &s) {
strings_.push_back(std::unique_ptr<std::string>(new std::string(s)));
return strings_.back().get();
}
*/
void save_text() {
lines_.back().append(yytext, yyleng);
yylloc_->columns(yyleng);
}
int yylex();
Tok prev_tok_;
std::vector<std::string> lines_;
//std::list<std::unique_ptr<std::string>> strings_;
BisonParser::semantic_type *yylval_;
BisonParser::location_type *yylloc_;
};
} // namespace cc
} // namespace ebpf