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/* sketch.y
Copyright (C) 2005,2006,2007,2008 Eugene K. Ressler, Jr.
This file is part of Sketch, a small, simple system for making
3d drawings with LaTeX and the PSTricks or TikZ package.
Sketch is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
Sketch is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Sketch; see the file COPYING.txt. If not, see
http://www.gnu.org/copyleft */
%{
#include <stdio.h>
#include <stdlib.h>
#if defined(_WIN32)
# include <malloc.h>
# if !defined(alloca)
# define alloca _alloca
# endif
# ifdef _MSC_VER
// turn of warning about unused goto label in bison skeleton
# pragma warning(disable:4102)
# endif
# define YYSTACK_USE_ALLOCA 1
#endif
#include "parse.h"
#include "expr.h"
#include "global.h"
int yylex(void);
void yyerror (char *s) /* Called by yyparse on error */
{
extern SRC_LINE line;
err(line, "%s", s);
}
static SYMBOL_TABLE *sym_tab;
// exported parse tree and global environment
static OBJECT *objects;
%}
%union {
char *str;
FLOAT flt;
POINT_3D pt;
VECTOR_3D vec;
TRANSFORM xf;
EXPR_VAL exv;
SYMBOL_NAME name;
OBJECT *obj;
OPTS *opts;
int bool;
int index;
}
%token <name>ID <name>PAREN_ID <name>BRACKET_ID
%token <name>DBL_BRACKET_ID <name>CURLY_ID <name>ANGLE_ID
%token <flt>NUM
%token <str>OPTS_STR <str>SPECIAL
%token <index>TICK
%token THEN DEF EMPTY_ANGLE
%token DOTS LINE CURVE POLYGON REPEAT SWEEP PUT
%token TRANSLATE ROTATE SCALE PROJECT PERSPECTIVE VIEW
%token SQRT SIN ASIN COS ACOS ATAN2 UNIT INVERSE
%token GLOBAL SET PICTUREBOX FRAME CAMERA
%token LANGUAGE PSTRICKS TIKZ LaTeX ConTeXt
%type <name> tagged_defs
%type <opts> options option_id_list
%type <flt> scalar scalar_expr opt_baseline
%type <pt> point point_expr
%type <vec> vector_literal vector_id vector vector_expr
%type <xf> transform transform_expr
%type <exv> expr
%type <obj> defs_and_decls rev_defs_and_decls decl def_or_decl defable
%type <obj> points rev_points transforms rev_transforms special_arg
%type <obj> special_args rev_special_args
%type <bool> opt_star
%type <index> output_language comma_macro_package graphics_language macro_package
%right THEN
%left '-' '+'
%left '*' '/' '.'
%left NEG /* negation--unary minus */
%right '^' /* exponentiation */
%left TICK /* point and vector indexing */
%%
input : defs_and_decls global_decl_block { objects = $1; }
/* sets global_env as a side effect */
global_decl_block : GLOBAL '{' global_decls '}'
| /* empty */
;
global_decls : global_decls global_decl
| global_decl
;
global_decl : SET OPTS_STR
{
set_global_env_opts(global_env, $2, line);
}
| PICTUREBOX '[' scalar_expr ']'
{
set_global_baseline(global_env, $3, line);
}
| PICTUREBOX opt_baseline point point
{
set_global_baseline(global_env, $2, line);
set_global_env_extent(global_env, $3, $4, line);
}
| CAMERA transform_expr
{
set_global_env_camera(global_env, $2, line);
}
| FRAME
{
set_global_env_frame(global_env, NULL, line);
}
| FRAME OPTS_STR
{
set_global_env_frame(global_env, $2, line);
}
| LANGUAGE output_language
{
set_global_output_language(global_env, $2, line);
}
| def
;
output_language : graphics_language comma_macro_package { $$ = $1 | $2; }
;
graphics_language : PSTRICKS { $$ = GEOL_PSTRICKS; }
| TIKZ { $$ = GEOL_TIKZ; }
;
comma_macro_package : ',' macro_package { $$ = $2; }
| /* empty */ { $$ = GEOL_LATEX; }
;
macro_package : LaTeX { $$ = GEOL_LATEX; }
| ConTeXt { $$ = GEOL_CONTEXT; }
;
opt_baseline : '[' scalar_expr ']' { $$ = $2; }
| /* empty */ { $$ = NO_BASELINE; }
;
defs_and_decls : rev_defs_and_decls { $$ = sibling_reverse($1); }
;
rev_defs_and_decls : rev_defs_and_decls def_or_decl { $$ = cat_objects(sibling_reverse($2), $1); }
| def_or_decl { $$ = sibling_reverse($1); }
;
def_or_decl : def { $$ = NULL; }
| decl { $$ = $1; }
;
/* slightly strange rules are to avoid inherited attributes */
def : DEF ID defable { new_symbol(sym_tab, $2, 0, $3, line); }
| tagged_defs EMPTY_ANGLE defable { new_symbol(sym_tab, $1, 0, $3, line); }
| DEF ID EMPTY_ANGLE { new_symbol(sym_tab, $2, 0, new_tag_def(), line); }
;
tagged_defs : DEF ID ANGLE_ID defable { strcpy($$, new_symbol(sym_tab, $2, $3, $4, line) ? "" : $2); }
| tagged_defs ANGLE_ID defable { strcpy($$, new_symbol(sym_tab, $1, $2, $3, line) ? "" : $1); }
;
defable : expr { $$ = object_from_expr(&$1); }
| decl { $$ = $1; }
| OPTS_STR { $$ = new_opts_def($1, line); }
;
decl : DOTS options points { $$ = new_dots($2, $3); }
| LINE options points { $$ = new_line($2, $3); }
| CURVE options points { $$ = new_curve($2, $3); }
| POLYGON options points { $$ = new_polygon($2, $3); }
| SWEEP options '{' scalar_expr opt_star ',' transforms '}' point
{
$$ = new_sweep($2, $4, $5, $7, new_point_def($9));
}
| SWEEP options '{' scalar_expr opt_star ',' transforms '}' decl
{
$$ = new_sweep($2, $4, $5, $7, $9);
}
| REPEAT '{' scalar_expr ',' transforms '}' decl
{
$$ = new_repeat($3, $5, $7);
}
| PUT '{' transform_expr '}' decl { $$ = new_compound($3, $5); }
| SPECIAL special_args { $$ = new_special($1, $2, line); }
| CURLY_ID { look_up_drawable(sym_tab, &$$, line, $1); }
| '{' { sym_tab = new_scope(sym_tab); }
defs_and_decls { sym_tab = old_scope(sym_tab); }
'}'
{
if ($3 == NULL)
err(line, "no drawables in compound declaration");
$$ = $3;
}
;
opt_star : EMPTY_ANGLE { $$ = 1; }
| /* empty */ { $$ = 0; }
;
option_id_list : option_id_list ',' ID
{
$$ = look_up_and_append_to_opts(sym_tab, &$1, line, $3);
}
| ID
{
$$ = NULL;
$$ = look_up_and_append_to_opts(sym_tab, &$$, line, $1);
}
;
options : OPTS_STR { $$ = new_opts($1, line); }
| BRACKET_ID { look_up_opts(sym_tab, &$$, line, $1); }
| '[' option_id_list ']' { $$ = $2; }
| /* empty */ { $$ = NULL; }
;
points : rev_points { $$ = sibling_reverse($1); }
;
rev_points : rev_points point { $$ = cat_objects(new_point_def($2), $1); }
| point { $$ = new_point_def($1); }
;
special_args : rev_special_args { $$ = sibling_reverse($1); }
;
rev_special_args : rev_special_args special_arg { $$ = cat_objects($2, $1); }
| /* empty */ { $$ = NULL; }
;
special_arg : scalar { $$ = new_scalar_def($1); }
| point { $$ = new_point_def($1); }
| vector_literal { $$ = new_vector_def($1); }
| OPTS_STR { $$ = new_opts_def($1, line); }
| BRACKET_ID { look_up_vector_or_opts(sym_tab, &$$, line, $1); }
;
transforms : rev_transforms { $$ = sibling_reverse($1); }
;
rev_transforms : rev_transforms ',' transform_expr { $$ = cat_objects(new_transform_def($3), $1); }
| transform_expr { $$ = new_transform_def($1); }
;
expr : scalar { set_float(&$$, $1); }
| point { set_point(&$$, $1); }
| vector { set_vector(&$$, $1); }
| transform { set_transform(&$$, $1); }
| expr '+' expr { do_add(&$$, &$1, &$3, line); }
| expr '-' expr { do_sub(&$$, &$1, &$3, line); }
| expr '*' expr { do_mul(&$$, &$1, &$3, line); }
| expr '/' expr { do_dvd(&$$, &$1, &$3, line); }
| expr '.' expr { do_dot(&$$, &$1, &$3, line); }
| expr THEN expr { do_thn(&$$, &$1, &$3, line); }
| '|' expr '|' { do_mag(&$$, &$2, line); }
| '-' expr %prec NEG { do_neg(&$$, &$2, line); }
| expr '^' expr { do_pwr(&$$, &$1, &$3, line); }
| '(' expr ')' { $$ = $2; }
| UNIT expr ')' { do_unit(&$$, &$2, line); }
| SQRT expr ')' { do_sqrt(&$$, &$2, line); }
| SIN expr ')' { do_sin(&$$, &$2, line); }
| COS expr ')' { do_cos(&$$, &$2, line); }
| ASIN expr ')' { do_asin(&$$, &$2, line); }
| ACOS expr ')' { do_acos(&$$, &$2, line); }
| ATAN2 expr ',' expr ')' { do_atan2(&$$, &$2, &$4, line); }
| expr TICK { do_index(&$$, &$1, $2, line); }
;
scalar : NUM { $$ = $1; }
| ID { look_up_scalar(sym_tab, &$$, line, $1); }
;
scalar_expr : expr { coerce_to_float(&$1, &$$, line); }
;
point : '(' scalar_expr ',' scalar_expr ',' scalar_expr ')'
{
$$[X] = $2; $$[Y] = $4; $$[Z] = $6;
}
| '(' scalar_expr ',' scalar_expr ')'
{
$$[X] = $2; $$[Y] = $4; $$[Z] = 0;
}
| PAREN_ID { look_up_point(sym_tab, $$, line, $1); }
;
point_expr : expr { coerce_to_point(&$1, $$, line); }
;
vector : vector_literal { copy_vec_3d($$, $1); }
| vector_id { copy_vec_3d($$, $1); }
;
vector_literal : '[' scalar_expr ',' scalar_expr ',' scalar_expr ']'
{
$$[X] = $2; $$[Y] = $4; $$[Z] = $6;
}
| '[' scalar_expr ',' scalar_expr ']'
{
$$[X] = $2; $$[Y] = $4; $$[Z] = 0;
}
;
vector_id : BRACKET_ID { look_up_vector(sym_tab, $$, line, $1); }
;
vector_expr : expr { coerce_to_vector(&$1, $$, line); }
;
transform : '['
'[' scalar_expr ',' scalar_expr ',' scalar_expr',' scalar_expr ']'
'[' scalar_expr ',' scalar_expr ',' scalar_expr',' scalar_expr ']'
'[' scalar_expr ',' scalar_expr ',' scalar_expr',' scalar_expr ']'
'[' scalar_expr ',' scalar_expr ',' scalar_expr',' scalar_expr ']'
']'
{ // transform is column major while elements are row major
$$[0] = $3; $$[4] = $5; $$[8] = $7; $$[12] = $9;
$$[1] = $12; $$[5] = $14; $$[9] = $16; $$[13] = $18;
$$[2] = $21; $$[6] = $23; $$[10] = $25; $$[14] = $27;
$$[3] = $30; $$[7] = $32; $$[11] = $34; $$[15] = $36;
}
| ROTATE scalar_expr ')'
{
set_angle_axis_rot_about_point($$, $2 * (PI/180), 0, 0);
}
| ROTATE scalar_expr ',' expr ')'
{
if (EXPR_TYPE_IS(&$4, E_POINT))
set_angle_axis_rot_about_point($$, $2 * (PI/180), $4.val.pt, 0);
else if (EXPR_TYPE_IS(&$4, E_VECTOR))
set_angle_axis_rot_about_point($$, $2 * (PI/180), 0, $4.val.vec);
else
err(line, "expected point or vector rotation parameter, and it's a %s",
expr_val_type_str[$4.tag]);
}
| ROTATE scalar_expr ',' point_expr ',' vector_expr ')'
{
set_angle_axis_rot_about_point($$, $2 * (PI/180), $4, $6);
}
| TRANSLATE vector_expr ')'
{
set_translation($$, $2[X], $2[Y], $2[Z]);
}
| SCALE expr ')'
{
if ($2.tag == E_FLOAT) {
FLOAT s = $2.val.flt;
set_scale($$, s, s, s);
}
else if ($2.tag == E_VECTOR) {
VECTOR v = $2.val.vec;
set_scale($$, v[X], v[Y], v[Z]);
}
else {
err(line,
"expected scalar or vector scale parameter, and it's a %s",
expr_val_type_str[$2.tag]);
set_ident($$);
}
}
| PROJECT ')' { set_parallel_projection($$); }
| PROJECT scalar_expr ')' { set_perspective_projection($$, $2); }
| PERSPECTIVE scalar_expr ')' { set_perspective_transform($$, $2); }
| VIEW point_expr ',' expr ',' vector_expr ')'
{
if ($4.tag == E_VECTOR)
set_view_transform($$, $2, $4.val.vec, $6);
else if ($4.tag == E_POINT)
set_view_transform_with_look_at($$, $2, $4.val.pt, $6);
else
err(line, "expected point or vector view parameter, and it's a %s",
expr_val_type_str[$4.tag]);
}
| VIEW point_expr ',' expr ')'
{
if ($4.tag == E_VECTOR)
set_view_transform($$, $2, $4.val.vec, NULL);
else if ($4.tag == E_POINT)
set_view_transform_with_look_at($$, $2, $4.val.pt, NULL);
else
err(line, "expected point or vector view parameter, and it's a %s",
expr_val_type_str[$4.tag]);
}
| VIEW point_expr ')'
{
set_view_transform($$, $2, NULL, NULL);
}
| INVERSE transform_expr ')' { do_inverse($$, $2, line); }
| DBL_BRACKET_ID { look_up_transform(sym_tab, $$, line, $1); }
;
transform_expr : expr { coerce_to_transform(&$1, $$, line); }
;
%%
int parse(SYMBOL_TABLE *st)
{
int ret;
objects = NULL;
sym_tab = st;
ret = yyparse();
// should set sym_tab back to NULL
sym_tab = old_scope(sym_tab);
if (sym_tab)
die(no_line, "zombie symbol table");
return ret;
}
OBJECT *parsed_objects(void)
{
return objects;
}
|