/
osogram.y
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osogram.y
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/* Copyright Contributors to the Open Shading Language project.
* SPDX-License-Identifier: BSD-3-Clause
* https://github.com/AcademySoftwareFoundation/OpenShadingLanguage
*/
/** Parser for OpenShadingLanguage 'object' files
**/
%define api.pure full
%lex-param { void *scanner }
%lex-param { OSL::pvt::OSOReader *osoreader }
%parse-param { void *scanner }
%parse-param { OSL::pvt::OSOReader *osoreader }
%{
// C++ declarations
#include <iostream>
#include <cstdlib>
#include <vector>
#include <string>
#include "osoreader.h"
#ifdef __clang__
#pragma clang diagnostic ignored "-Wparentheses-equality"
#endif
#if OSL_CLANG_VERSION >= 150000
#pragma clang diagnostic ignored "-Wunused-but-set-variable"
#endif
#if defined(__GNUC__) || defined(__clang__)
#pragma GCC visibility push(hidden)
#endif
%}
// This is the definition for the union that defines YYSTYPE
%union
{
int i; // For integer falues
float f; // For float values
const char *s; // For string values -- guaranteed to be a ustring.c_str()
}
%{
OSL_NAMESPACE_ENTER
namespace pvt {
int yylex(YYSTYPE* yylval_param, YYLTYPE* yylloc_param, void* yyscanner, OSOReader* osoreader);
void yyerror (YYLTYPE* yylloc_param, void* yyscanner, OSOReader* osoreader, const char* err);
TypeDesc osolextype (int lex);
} // namespace pvt
OSL_NAMESPACE_EXIT
using namespace OSL;
using namespace OSL::pvt;
%}
// Tell Bison to track locations for improved error messages
%locations
// Define the terminal symbols.
%token <s> IDENTIFIER STRING_LITERAL HINT
%token <i> INT_LITERAL
%token <f> FLOAT_LITERAL
%token <i> COLORTYPE FLOATTYPE INTTYPE MATRIXTYPE
%token <i> NORMALTYPE POINTTYPE STRINGTYPE VECTORTYPE VOIDTYPE CLOSURE STRUCT
%token <i> CODE SYMTYPE ENDOFLINE
// Define the nonterminals
%type <i> oso_file version shader_declaration
%type <s> shader_type
%type <i> symbols_opt symbols symbol typespec simple_typename arraylen_opt
%type <i> initial_values_opt initial_values initial_value
%type <i> codemarker label
%type <i> instructions instruction
%type <s> opcode
%type <i> arguments_opt arguments argument
%type <i> jumptargets_opt jumptargets jumptarget
%type <i> hints_opt hints hint
// Define the starting nonterminal
%start oso_file
%%
oso_file
: version shader_declaration symbols_opt codemarker instructions
{
osoreader->codeend ();
$$ = 0;
}
;
version
: IDENTIFIER FLOAT_LITERAL ENDOFLINE
{
int major = (int) $2;
int minor = (int) (100*($2-major) + 0.5);
osoreader->version ($1, major, minor);
$$ = 0;
}
;
shader_declaration
: shader_type IDENTIFIER
{
osoreader->shader ($1, $2);
}
hints_opt ENDOFLINE
{
$$ = 0;
}
;
symbols_opt
: symbols { $$ = 0; }
| /* empty */ { $$ = 0; }
;
codemarker
: CODE IDENTIFIER ENDOFLINE
{
if (! osoreader->parse_code_section())
YYACCEPT;
osoreader->codemarker ($2);
}
;
instructions
: instruction
| instructions instruction
;
instruction
: label opcode
{
osoreader->instruction ($1, $2);
}
arguments_opt jumptargets_opt hints_opt ENDOFLINE
{
osoreader->instruction_end ();
}
| codemarker
| ENDOFLINE
;
shader_type
: IDENTIFIER
;
symbols
: symbol
| symbols symbol
;
symbol
: SYMTYPE typespec arraylen_opt IDENTIFIER
{
if ((SymType)$1 == SymTypeTemp &&
osoreader->stop_parsing_at_temp_symbols())
YYACCEPT;
TypeSpec typespec = osoreader->current_typespec();
if ($3)
typespec.make_array ($3);
osoreader->symbol ((SymType)$1, typespec, $4);
}
initial_values_opt hints_opt
{
osoreader->parameter_done ();
}
ENDOFLINE
| ENDOFLINE
;
/* typespec operates by merely setting the current_typespec */
typespec
: simple_typename
{
osoreader->current_typespec(osolextype ($1));
$$ = 0;
}
| CLOSURE simple_typename
{
osoreader->current_typespec(TypeSpec (osolextype ($2), true));
$$ = 0;
}
| STRUCT IDENTIFIER
{
osoreader->current_typespec(TypeSpec ($2, 0));
$$ = 0;
}
;
simple_typename
: COLORTYPE
| FLOATTYPE
| INTTYPE
| MATRIXTYPE
| NORMALTYPE
| POINTTYPE
| STRINGTYPE
| VECTORTYPE
| VOIDTYPE
;
arraylen_opt
: '[' INT_LITERAL ']' { $$ = $2; }
| '[' ']' { $$ = -1; }
| /* empty */ { $$ = 0; }
;
initial_values_opt
: initial_values
| /* empty */ { $$ = 0; }
;
initial_values
: initial_value
| initial_values initial_value
;
initial_value
: FLOAT_LITERAL
{
osoreader->symdefault ($1);
$$ = 0;
}
| INT_LITERAL
{
osoreader->symdefault ($1);
$$ = 0;
}
| STRING_LITERAL
{
osoreader->symdefault ($1);
$$ = 0;
}
;
label
: INT_LITERAL ':'
| /* empty */ { $$ = -1; }
;
opcode
: IDENTIFIER
;
arguments_opt
: arguments
| /* empty */ { $$ = 0; }
;
arguments
: argument
| arguments argument
;
argument
: IDENTIFIER
{
osoreader->instruction_arg ($1);
}
;
jumptargets_opt
: jumptargets
| /* empty */ { $$ = 0; }
;
jumptargets
: jumptarget
| jumptargets jumptarget
;
jumptarget
: INT_LITERAL
{
osoreader->instruction_jump ($1);
}
;
hints_opt
: hints
| /* empty */ { $$ = 0; }
;
hints
: hint
| hints hint
;
hint
: HINT
{
osoreader->hint ($1);
$$ = 0;
}
;
%%
void
OSL::pvt::yyerror (YYLTYPE* yylloc_param, void* yyscanner, OSOReader* osoreader, const char* err)
{
osoreader->errhandler().errorfmt("Error, line : ",
osoreader->lineno(), err);
}
// Convert from the lexer's symbolic type (COLORTYPE, etc.) to a TypeDesc.
inline TypeDesc
OSL::pvt::osolextype (int lex)
{
switch (lex) {
case COLORTYPE : return TypeDesc::TypeColor;
case FLOATTYPE : return TypeDesc::TypeFloat;
case INTTYPE : return TypeDesc::TypeInt;
case MATRIXTYPE : return TypeDesc::TypeMatrix;
case NORMALTYPE : return TypeDesc::TypeNormal;
case POINTTYPE : return TypeDesc::TypePoint;
case STRINGTYPE : return TypeDesc::TypeString;
case VECTORTYPE : return TypeDesc::TypeVector;
case VOIDTYPE : return TypeDesc::NONE;
default: return TypeDesc::UNKNOWN;
}
}
#if defined(__GNUC__) || defined(__clang__)
#pragma GCC visibility pop
#endif