sch2fig/: recursively parse sub-sheets

sch2fig/TODO

@@ -1,5 +1,5 @@
 - better text size guessing also for FIG
-- recursing into sheets:; use base path as starting point
+- let user to enable/disable recursion; communicate sheet boundaries to backend
 - unify alignment, direction
 - support fonts attributes ?
 - support line thickness ?

sch2fig/main.c

@@ -24,12 +24,6 @@
 #include "sch.h"
 
 
-static bool do_sch_parse(void *user, const char *line)
-{
-	return sch_parse(user, line);
-}
-
-
 static bool do_lib_parse(void *user, const char *line)
 {
 	return lib_parse(user, line);
@@ -81,9 +75,9 @@ int main(int argc, char **argv)
 	}
 
 	sch_init(&sch_ctx);
-	file_read(argv[argc - 1], do_sch_parse, &sch_ctx);
+	sch_parse(&sch_ctx, argv[argc - 1]);
 	gfx_init(&fig_ops, template, n_vars, vars);
 	//gfx_init(&cairo_ops, template, n_vars, vars);
-	sch_render(&sch_ctx);
+	sch_render(sch_ctx.sheets);
 	gfx_end();
 }

sch2fig/sch-parse.c

@@ -15,11 +15,13 @@
 #include <stdbool.h>
 #include <stdlib.h>
 #include <stdio.h>
+#include <unistd.h>
 #include <string.h>
 #include <assert.h>
 
 #include "util.h"
 #include "dwg.h"
+#include "file.h"
 #include "lib.h"
 #include "sch.h"
 
@@ -266,18 +268,78 @@ static void submit_obj(struct sch_ctx *ctx, enum sch_obj_type type)
 	obj = alloc_type(struct sch_obj);
 	*obj = ctx->obj;
 	obj->type = type;
-	obj->next = ctx->objs;
+	obj->next = NULL;
-	ctx->objs = obj;
+
+	*ctx->next_obj = obj;
+	ctx->next_obj = &obj->next;
 }
 
 
-bool sch_parse(struct sch_ctx *ctx, const char *line)
+static struct sheet *new_sheet(struct sch_ctx *ctx)
 {
+	struct sheet *sheet;
+
+	sheet = alloc_type(struct sheet);
+	sheet->objs = NULL;
+	sheet->next = NULL;
+
+	ctx->next_obj = &sheet->objs;
+
+	*ctx->next_sheet = sheet;
+	ctx->next_sheet = &sheet->next;
+
+	return sheet;
+}
+
+
+static bool parse_line(void *user, const char *line);
+
+
+static void recurse_sheet(struct sch_ctx *ctx)
+{
+	struct sch_obj **saved_next_obj = ctx->next_obj;
+	const char *parent = ctx->file->name;
+	char *tmp = NULL;
+	struct sch_file dsc = {
+		.name	= ctx->obj.u.sheet.file,
+		.lineno	= 0,
+		.parent	= ctx->file,
+	};
+
+	/* @@@ clean this up */
+
+	if (access(dsc.name, R_OK)) {
+		const char *slash;
+
+		slash = strrchr(parent, '/');
+		if (slash) {
+			unsigned len = slash + 1 - parent;
+
+			tmp = alloc_size(len + strlen(dsc.name) + 1);
+			memcpy(tmp, parent, len);
+			strcpy(tmp + len, dsc.name);
+			dsc.name = tmp;
+		}
+	}
+
+	new_sheet(ctx);
+	ctx->file = &dsc;
+	ctx->state = sch_descr;
+	file_read(dsc.name, parse_line, ctx);
+	ctx->file = dsc.parent;
+	ctx->next_obj = saved_next_obj;
+	free(tmp);
+}
+
+
+static bool parse_line(void *user, const char *line)
+{
+	struct sch_ctx *ctx = user;
 	struct sch_obj *obj = &ctx->obj;
 	int n = 0;
 	char *s;
 
-	ctx->lineno++;
+	ctx->file->lineno++;
 
 	switch (ctx->state) {
 	case sch_basic:
@@ -423,8 +485,9 @@ bool sch_parse(struct sch_ctx *ctx, const char *line)
 		break;
 	case sch_sheet:
 		if (sscanf(line, "$EndSheet%n", &n) == 0 && n) {
-			ctx->state = sch_basic;
 			submit_obj(ctx, sch_obj_sheet);
+			recurse_sheet(ctx);
+			ctx->state = sch_basic;
 			return 1;
 		}
 		if (sscanf(line, "S %d %d %u %u",
@@ -467,14 +530,29 @@ bool sch_parse(struct sch_ctx *ctx, const char *line)
 	default:
 		abort();
 	}
-	fprintf(stderr, "%u: cannot parse\n\"%s\"\n", ctx->lineno, line);
+	fprintf(stderr, "%s:%u: cannot parse\n\"%s\"\n",
+	    ctx->file->name, ctx->file->lineno, line);
 	exit(1);
 }
 
 
+void sch_parse(struct sch_ctx *ctx, const char *file)
+{
+	struct sch_file dsc = {
+		.name	= file,
+		.lineno	= 0,
+		.parent	= NULL,
+	};
+
+	ctx->file = &dsc;
+	file_read(file, parse_line, ctx);
+}
+
+
 void sch_init(struct sch_ctx *ctx)
 {
 	ctx->state = sch_descr;
-	ctx->objs = NULL;
+	ctx->sheets = NULL;
-	ctx->lineno = 0;
+	ctx->next_sheet = &ctx->sheets;
+	new_sheet(ctx);
 }

sch2fig/sch-render.c

@@ -129,11 +129,11 @@ static void render_sheet(const struct sch_obj *obj,
 }
 
 
-void sch_render(const struct sch_ctx *ctx)
+void sch_render(const struct sheet *sheet)
 {
 	const struct sch_obj *obj;
 
-	for (obj = ctx->objs; obj; obj = obj->next)
+	for (obj = sheet->objs; obj; obj = obj->next)
 		switch (obj->type) {
 		case sch_obj_wire:
 			{

sch2fig/sch.h

@@ -86,20 +86,34 @@ struct sch_obj {
 	struct sch_obj *next;
 };
 
+struct sheet {
+	struct sch_obj *objs;
+	struct sheet *next;
+};
+
+struct sch_file {
+	const char *name;
+	int lineno;
+	struct sch_file *parent;
+};
+
 struct sch_ctx {
 	enum sch_state state;
 
 	struct sch_obj obj;
-	struct sch_obj *objs;
+	struct sch_obj **next_obj;
 
-	unsigned lineno;
+	struct sheet *sheets;
+	struct sheet **next_sheet;
+
+	struct sch_file *file;
 };
 
 
 void decode_alignment(struct text *txt, char hor, char vert);
 
-void sch_render(const struct sch_ctx *ctx);
+void sch_render(const struct sheet *sheet);
-bool sch_parse(struct sch_ctx *ctx, const char *line);
+void sch_parse(struct sch_ctx *ctx, const char *line);
 void sch_init(struct sch_ctx *ctx);
 
 #endif /* !SCH_H */