1 files changed, 63 insertions, 0 deletions
diff --git a/lib/aplwc_internal.h b/lib/aplwc_internal.h
index 99c16ee..dd676fb 100644
--- a/lib/aplwc_internal.h
+++ b/lib/aplwc_internal.h
@@ -21,11 +21,74 @@
 #ifndef APLWC_INTERNAL_H
 #define APLWC_INTERNAL_H
 
+#include <stdarg.h>
+#include <stdbool.h>
+
+enum aplwc_token_tag {
+	APLWC_TOKEN_SYSCMD,
+	APLWC_TOKEN_SYSCMD_ARGS,
+	
+	APLWC_TOKEN_ERROR,
+};
+
+enum aplwc_ast_tag {
+	APLWC_AST_SYSCMD,
+
+	APLWC_AST_ERROR,
+};
+
 struct aplwc {
+	void *(*alloc)(size_t);
+	void (*free)(void *);
+	void *(*realloc)(void *, size_t);
+	
 	struct aplwc_syscmd **syscmds;
 	int n_syscmds;
+        bool running;
+};
+
+struct aplwc_eval_context {
+	struct aplwc *aplwc;
+	char *text;
+	size_t offset;
+	size_t length;
+
+	size_t n_tokens;
+	struct aplwc_token **tokens;
+
+	size_t token_offset;
+	struct aplwc_ast *ast;
+};
+
+struct aplwc_token {
+	enum aplwc_token_tag tag;
+	size_t offset_start;
+	size_t offset_end;
+	
+	union {
+	} data;
+};
+
+struct aplwc_ast {
+	enum aplwc_ast_tag tag;
+
+	union {
+		struct {
+			struct aplwc_syscmd *syscmd;
+			char *args;
+		} syscmd;
+	} data;
 };
 
 struct aplwc_syscmd *aplwc_lookup_syscmd(struct aplwc *, const char *);
+struct aplwc_eval_context *aplwc_new_eval_context(struct aplwc *);
+void aplwc_scan_line(struct aplwc_eval_context *, const char *);
+void aplwc_parse(struct aplwc_eval_context *);
+void aplwc_eval(struct aplwc_eval_context *);
+void aplwc_free_eval_context(struct aplwc_eval_context *);
+void aplwc_free_ast(struct aplwc *, struct aplwc_ast *);
+char *aplwc_strdup(struct aplwc *, const char *);
+void aplwc_output(struct aplwc *, const char *, ...);
+void aplwc_voutput(struct aplwc *, const char *, va_list);
 
 #endif /* APLWC_INTERNAL_H */