statemachine basic architecture

engine/slc.h

@@ -1,6 +1,10 @@
 #ifndef SLC_H
 #define SLC_H
 
+#include<stdint.h> // uint8_t, uint32_t..
+#include<string.h> // memcpy, strlen..
+#include<stddef.h> // NULL
+
 /** Possible word types */
 enum SLC_WORDTYP {
 	/** Still in plain text */
@@ -107,6 +111,12 @@ enum SLC_IO_OP {
 };
 typedef enum SLC_IO_OP SLC_IO_OP;
 
+union symptr {
+	uint32_t *varp;
+	wordstart *worp;
+};
+typedef union symptr symptr;
+
 /**
  * Function-abstraction for a "symbol-table".
  *
@@ -123,8 +133,7 @@ typedef enum SLC_IO_OP SLC_IO_OP;
  * @param ptr When adding a found word/variable to the symbol table, the key will point to this wordstart* or uint32_t*
  * @returns The word/var definition stored for the key, or NULL when it is not stored yet or op is SET and there was an error.
  */
-typedef void* (*sym)(SLC_SYM_OP op, char *key, void *ptr);
+typedef symptr (*sym)(SLC_SYM_OP op, char *key, symptr ptr);
-// TODO: union for this?
 
 /**
  * Function-abstraction for an integer "stack".
@@ -161,6 +170,14 @@ typedef uint32_t (*stack)(SLC_STACK_OP op, uint32_t param);
  */
 typedef uint32_t (*session)(SLC_SESSION_OP op, uint32_t i, uint32_t j);
 
+union iores {
+	/** Either the cmd result or the handle pointer*/
+	const char *ptr;
+	/** The read character */
+	char c;
+};
+typedef union iores iores;
+
 /**
  * Function-abstraction for io connectors.
  *
@@ -180,14 +197,54 @@ typedef uint32_t (*session)(SLC_SESSION_OP op, uint32_t i, uint32_t j);
  * @param param The name or temporary name or command or the handle pointer parameter depending on op.
  * @returns A handle pointer or pointer to character to read / written or closed/unlocked handle (NULL on errors). Also cmd stdout.
  */
-typedef const char* (*ioconn)(SLC_IO_OP op, const char *param);
+typedef iores (*ioconn)(SLC_IO_OP op, const char *param);
-// TODO: union for this?
 
 /**
  * Function-abstraction for reading the source code byte-by-byte.
  */
 typedef uint8_t (*coderead)();
 
+enum slc_state : uint32_t {
+	/** Before things */
+	SLC_START,
+	/** In a comment */
+	SLC_COMMENT,
+	/** In multi-line comment */
+	SLC_MULTILINE_COMMENT,
+	/** Name part of word-definition (after ':') - whitespace ends it */
+	SLC_DEF_NAME,
+	/** Variable-listing part of word-definition - endline, '(', '[' or '{' ends it */
+	SLC_DEF_VAR,
+	/** Raw body part of the word definition - these can contain local variable accesses + words, depth counted by vars */
+	SLC_DEF_BODY,
+	/** Name part of a word "call" (non-definition). Ends by whitespace, '@' (in case of variable) or various parentheses */
+	SLC_WORD_NAME,
+	/** Variable call (MYWORD@MYVAR) - we get to be here from SLC_WORD_NAME or from START */
+	SLC_WORD_VAR,
+};
+typedef enum slc_state slc_state;
+
+static inline slc_state slc_comment_statechange_in(
+		slc_state current_state,
+		char c,
+		const char *singleline_comment,
+		const char *multiline_comment_opener,
+		int singleline_comment_len,
+		int multiline_comment_len,
+		int *comment_i,
+		int *multiline_i){
+	// FIXME: Implement
+	return current_state;
+}
+
+static inline slc_state slc_defname_statechange(
+		slc_state current_state,
+		char c,
+		const char *prefix) {
+	// FIXME: Implement
+	return current_state;
+}
+
 /**
  * This function runs the main slc engine over a snippet of code.
  *
@@ -217,9 +274,13 @@ typedef uint8_t (*coderead)();
  * @param session_storage Can allocate and use arbitrary memory with this.
  * @param symbol_table The symbol table to use while processing.
  * @param code_stack The code stack (return addresses) to use.
+ * @param nesting_stack The stack used for the state-machine of the nested words.
  * @param data_stack The data stack (forth-like stack) to use.
  * @param insert_stack Used for temporarily expanding the input stream (one word level above current) with further words.
  * @param io_connector The engine uses this to open/close pipes/files and write/read them.
+ * @param singleline_comment Like "//" - the character string that makes the rest of the line being comment. Can be "" (no NULL).
+ * @param multiline_comment_opener The character string that starts a multiline comment. Like / and * for C. Can be "" (no NULL).
+ * @param multiline_comment_closer The character string that ends a multiline comment. Like * and / for C. Can be "" (no NULL).
  * @param prefix The prefix added to the lookup of built-ins. Useful when you write a compiler with SLC. Defaults to "" (empty).
  * @param ender The character string that ends a word definition. Defaults to ";".
  * @param varprefix The character string that prefixes variable declarations. Defaults to "@".
@@ -229,14 +290,64 @@ static inline void slc(
 		session session_storage,
 		sym symbol_table,
 		stack code_stack,
+		stack nesting_stack,
 		stack data_stack,
 		stack insert_stack,
 		ioconn io_connector,
+		const char *singleline_comment,
+		const char *multiline_comment_opener,
+		const char *multiline_comment_closer,
 		const char *prefix,
 		const char *ender,
-	const char *varprefix
+		const char *varprefix) {
-) {
+	slc_state state = SLC_START;
-	// TODO
+	int singleline_comment_len = strlen(singleline_comment);
+	int multiline_comment_opener_len = strlen(multiline_comment_opener);
+
+	uint8_t c = 0;
+	while(((c = code_src()) != 0)) {
+		switch(state) {
+			case SLC_START:
+				int comment_i = 0;
+				int multiline_i = 0;
+				int def_name_i = 0;
+				/* state -> comment | multiline_comment */
+				state = slc_comment_statechange_in(
+						state,
+						c,
+						singleline_comment,
+						multiline_comment_opener, 
+						singleline_comment_len,
+						multiline_comment_opener_len,
+						&comment_i,
+						&multiline_i);
+				/* state -> def_name */
+				if(state == SLC_START) {
+					state = slc_defname_statechange(
+							state,
+							c,
+							prefix);
+
+				}
+				if(state == SLC_START) {
+				}
+				break;
+			case SLC_COMMENT:
+				break;
+			case SLC_MULTILINE_COMMENT:
+				break;
+			case SLC_DEF_NAME:
+				break;
+			case SLC_DEF_VAR:
+				break;
+			case SLC_DEF_BODY:
+				break;
+			case SLC_WORD_NAME:
+				break;
+			case SLC_WORD_VAR:
+				break;
+		}
+	}
 }
 
 #endif /* SLC_H */