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diff --git a/kicad/sch.h b/kicad/sch.h
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+/*
+ * kicad/sch.h - Parse Eeschema .sch file
+ *
+ * Written 2016 by Werner Almesberger
+ * Copyright 2016 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.
+ */
+
+
+#ifndef KICAD_SCH_H
+#define KICAD_SCH_H
+
+#include <stdbool.h>
+
+#include "dwg.h"
+#include "text.h"
+#include "file/file.h"
+#include "kicad/lib.h"
+
+
+enum sch_state {
+ sch_basic, /* basic state */
+ sch_descr, /* prelude and description */
+ sch_comp, /* component */
+ sch_sheet, /* sub-sheet */
+ sch_text, /* text or label */
+ sch_wire, /* wire */
+ sch_eof, /* skipping anything after $EndSCHEMATC */
+};
+
+struct sheet;
+
+struct sch_obj {
+ enum sch_obj_type {
+ sch_obj_wire,
+ sch_obj_junction,
+ sch_obj_noconn,
+ sch_obj_text,
+ sch_obj_glabel,
+ sch_obj_comp,
+ sch_obj_sheet,
+ } type;
+
+ int x, y;
+
+ union {
+ struct sch_wire {
+ void (*fn)(int sx, int sy, int ex, int ey);
+ int ex, ey;
+ } wire;
+ struct sch_text {
+ void (*fn)(int x, int y, const char *s,
+ int dir, int dim, enum dwg_shape shape,
+ struct dwg_bbox *bbox);
+ const char *s;
+ int dir; /* orientation */
+ int dim; /* dimension */
+ enum dwg_shape shape;
+ struct dwg_bbox bbox; /* set when rendering; glabel */
+ } text;
+ struct sch_comp {
+ const struct comp *comp; /* current component */
+ unsigned unit; /* unit of current component */
+ unsigned convert;/* "De Morgan" selection */
+ struct comp_field {
+ struct text txt;
+ struct comp_field *next;
+ } *fields;
+ int m[6];
+ } comp;
+ struct sch_sheet {
+ unsigned h, w;
+ const char *name;
+ unsigned name_dim;
+ const char *file;
+ unsigned file_dim;
+ bool rotated;
+ bool error; /* if set, sheet == NULL */
+ const struct sheet *sheet;
+ /* pointer to sub-sheet; NULL if absent */
+
+ struct sheet_field {
+ char *s;
+ int x, y;
+ unsigned dim;
+ enum dwg_shape shape;
+ unsigned side;
+ struct sheet_field *next;
+ } *fields;
+ } sheet;
+ } u;
+
+ struct sch_obj *next;
+};
+
+struct sheet {
+ const char *title; /* malloced, unless delta */
+ struct sch_obj *objs;
+ struct sch_obj **next_obj;
+ struct sheet *next;
+
+ bool has_children; /* aka sub-sheets */
+
+ /* caching */
+ void *oid;
+};
+
+struct sch_ctx {
+ enum sch_state state;
+
+ bool recurse;
+
+ struct sch_obj obj;
+
+ struct sheet *curr_sheet;
+ struct sheet *sheets;
+ struct sheet **next_sheet;
+
+ /* for caching */
+ const struct sch_ctx *prev;
+
+ const struct lib *lib;
+};
+
+
+void decode_alignment(struct text *txt, char hor, char vert);
+
+void sch_render(const struct sheet *sheet);
+bool sch_parse(struct sch_ctx *ctx, struct file *file, const struct lib *lib,
+ const struct sch_ctx *prev);
+void sch_init(struct sch_ctx *ctx, bool recurse);
+void sch_free(struct sch_ctx *ctx);
+
+#endif /* !KICAD_SCH_H */