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/*
//
// Copyright (c) 2002-2011 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
This file contains the Lex specification for GLSL ES preprocessor.
Based on Microsoft Visual Studio 2010 Preprocessor Grammar:
http://msdn.microsoft.com/en-us/library/2scxys89.aspx
IF YOU MODIFY THIS FILE YOU ALSO NEED TO RUN generate_parser.sh.
*/
%top{
//
// Copyright (c) 2011 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// This file is auto-generated by generate_parser.sh. DO NOT EDIT!
}
%{
#include "compiler/debug.h"
#include "Context.h"
#include "pp_tab.h"
#define YY_USER_ACTION \
do { \
yylloc->first_line = yylineno; \
yylloc->first_column = yycolumn + 1; \
yycolumn += yyleng; \
} while(0);
#define YY_INPUT(buf, result, maxSize) \
result = yyextra->readInput(buf, maxSize);
static std::string* extractMacroName(const char* str, int len);
%}
%option noyywrap nounput never-interactive
%option yylineno reentrant bison-bridge bison-locations
%option stack
%option prefix="pp"
%option extra-type="pp::Context*"
HSPACE [ \t]
HASH ^{HSPACE}*#{HSPACE}*
IDENTIFIER [_a-zA-Z][_a-zA-Z0-9]*
PUNCTUATOR [][<>(){}.+-/*%^|&~=!:;,?]
DECIMAL_CONSTANT [1-9][0-9]*
OCTAL_CONSTANT 0[0-7]*
HEXADECIMAL_CONSTANT 0[xX][0-9a-fA-F]+
DIGIT [0-9]
EXPONENT_PART [eE][+-]?{DIGIT}+
FRACTIONAL_CONSTANT ({DIGIT}*"."{DIGIT}+)|({DIGIT}+".")
%%
{HASH} { return HASH; }
{HASH}define{HSPACE}+{IDENTIFIER}/[ \t\n] {
yylval->sval = extractMacroName(yytext, yyleng);
return HASH_DEFINE_OBJ;
}
{HASH}define{HSPACE}+{IDENTIFIER}/"(" {
yylval->sval = extractMacroName(yytext, yyleng);
return HASH_DEFINE_FUNC;
}
{HASH}undef{HSPACE}+ { return HASH_UNDEF; }
{HASH}if { return HASH_IF; }
{HASH}ifdef { return HASH_IFDEF; }
{HASH}ifndef { return HASH_IFNDEF; }
{HASH}else { return HASH_ELSE; }
{HASH}elif { return HASH_ELIF; }
{HASH}endif { return HASH_ENDIF; }
"defined" { return DEFINED; }
{HASH}error { return HASH_ERROR; }
{HASH}pragma { return HASH_PRAGMA; }
{HASH}extension { return HASH_EXTENSION; }
{HASH}version { return HASH_VERSION; }
{HASH}line { return HASH_LINE; }
{IDENTIFIER} {
yylval->sval = new std::string(yytext, yyleng);
return IDENTIFIER;
}
{DECIMAL_CONSTANT}|{OCTAL_CONSTANT}|{HEXADECIMAL_CONSTANT} {
yylval->sval = new std::string(yytext, yyleng);
return INT_CONSTANT;
}
({DIGIT}+{EXPONENT_PART})|({FRACTIONAL_CONSTANT}{EXPONENT_PART}?) {
yylval->sval = new std::string(yytext, yyleng);
return FLOAT_CONSTANT;
}
{PUNCTUATOR} { return yytext[0]; }
[ \t\v\f]+ { /* Ignore whitespace */ }
\n {
++yylineno; yycolumn = 0;
return yytext[0];
}
<*><<EOF>> { yyterminate(); }
%%
std::string* extractMacroName(const char* str, int len)
{
// The input string is of the form {HASH}define{HSPACE}+{IDENTIFIER}
// We just need to find the last HSPACE.
ASSERT(str && (len > 8)); // strlen("#define ") == 8;
std::string* name = NULL;
for (int i = len - 1; i >= 0; --i)
{
if ((str[i] == ' ') || (str[i] == '\t'))
{
name = new std::string(str + i + 1, len - i - 1);
break;
}
}
ASSERT(name);
return name;
}
namespace pp {
int Context::readInput(char* buf, int maxSize)
{
int nread = YY_NULL;
while (!mInput->eof() &&
(mInput->error() == pp::Input::kErrorNone) &&
(nread == YY_NULL))
{
int line = 0, file = 0;
pp::Token::decodeLocation(yyget_lineno(mLexer), &line, &file);
file = mInput->stringIndex();
yyset_lineno(pp::Token::encodeLocation(line, file), mLexer);
nread = mInput->read(buf, maxSize);
if (mInput->error() == pp::Input::kErrorUnexpectedEOF)
{
// TODO(alokp): Report error.
}
}
return nread;
}
bool Context::initLexer()
{
ASSERT(mLexer == NULL);
if (yylex_init_extra(this, &mLexer))
return false;
yyrestart(0, mLexer);
return true;
}
void Context::destroyLexer()
{
ASSERT(mLexer);
yylex_destroy(mLexer);
mLexer = NULL;
}
} // namespace pp
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