%{
/*
 * lang.y - Toolpath adaptation language
 *
 * Written 2010 by Werner Almesberger
 * Copyright 2010 by Werner Almesberger
 *
 * This program 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 2 of the License, or
 * (at your option) any later version.
 */


#include <stdlib.h>

#include "path.h"
#include "ops.h"
#include "gnuplot.h"
#include "gerber.h"

#include "y.tab.h"


static double xo = 0, yo = 0, zo = 0;
static struct path *paths = NULL;


static void add_paths(struct path *new)
{
	struct path **anchor = &paths;

	while (*anchor)
		anchor = &(*anchor)->next;
	*anchor = new;
}


static void translate(double x, double y, double z)
{
	struct path *path;
	struct point *p;

	for (path = paths; path; path = path->next)
		for (p = path->first; p; p = p->next) {
			p->x += x;
			p->y += y;
			p->z += z;
		}
}


static double ref_pick_1(int ref, double a, double b)
{
	switch (ref) {
	case 0:
		return a;
	case 1:
		return (a+b)/2;
	case 2:
		return b;
	default:
		abort();
	}
}


static void ref_pick_xy(int ref, double xa, double ya, double xb, double yb,
    double *x, double *y)
{
	*x = ref_pick_1((ref-1) % 3, xa, xb);
	*y = ref_pick_1((ref-1)/3, ya, yb);
}


static void align(int ref, double x, double y)
{
	const struct path *path;
	const struct point *p;
	double xa = 0, ya = 0, xb = 0, yb = 0;
	double xr, yr, xd, yd;
	int first = 1;

	for (path = paths; path; path = path->next)
		for (p = path->first; p; p = p->next) {
			if (first || p->x < xa)
				xa = p->x;
			if (first || p->x > xb)
				xb = p->x;
			if (first || p->y < ya)
				ya = p->y;
			if (first || p->y > yb)
				yb = p->y;
			first = 0;
		}

	ref_pick_xy(ref, xa, ya, xb, yb, &xr, &yr);
	xd = x-xr;
	yd = y-yr;

	translate(xd, yd, 0);
	xo += xd;
	yo += yd;
}


%}


%union {
	double num;
	char *str;
};


%token		TOK_ALIGN TOK_ARRAY TOK_CLEAR TOK_RESET TOK_TOOL
%token		TOK_TRANSLATE TOK_Z
%token		TOK_GERBER TOK_GNUPLOT TOK_WRITE
%token		TOK_DOG

%token	<num>	NUMBER
%token	<str>	STRING

%type	<str>	opt_filename

%%

all:
	| command all
	;

command:
	TOK_ALIGN NUMBER NUMBER NUMBER
		{
			align((int) $2, $3, $4);
		}
	| TOK_ALIGN NUMBER NUMBER NUMBER NUMBER NUMBER
		{
			int ref = $2;
			double x, y;

			ref_pick_xy(ref, $3, $4, $5, $6, &x, &y);
			align(ref, x, y);
		}
	| TOK_ARRAY NUMBER NUMBER NUMBER NUMBER
		{
			double x = $2*$4;
			double y = $3*$5;

			translate(x, y, 0);
		}
	| TOK_CLEAR
		{
			struct path *next;

			while (paths) {
				next = paths->next;
				path_free(paths);
				paths = next;
			}
		}
	| TOK_RESET
		{
			xo = yo = 0;
		}
	| TOK_TOOL
		{
			tool_comp_paths(paths, 0);
		}
	| TOK_TOOL TOK_DOG
		{
			tool_comp_paths(paths, 1);
		}
	| TOK_TRANSLATE NUMBER NUMBER
		{
			translate($2, $3, 0);
			xo += $2;
			yo += $3;
		}
	| TOK_Z NUMBER
		{
			zo -= $2;
		}
	| TOK_Z NUMBER NUMBER
		{
			zo -= $2+$3;
		}
	| TOK_GERBER NUMBER opt_filename
		{
			add_paths(gerber_read($3, $2/2));
			translate(xo, yo, 0);
		}
	| TOK_GNUPLOT NUMBER opt_filename
		{
			add_paths(gnuplot_read($3, $2/2));
			translate(xo, yo, 0);
		}
	| TOK_WRITE opt_filename
		{
			translate(0, 0, zo);
			gnuplot_write($2, paths);
			translate(0, 0, -zo);
		}
	;

opt_filename:
		{
			$$ = NULL;
		}
	| STRING
		{
			$$ = $1;
		}
	;