Funny C unions

src/parser.c

@@ -45,7 +45,7 @@ tSyntaxElement* parse(FILE* file) {
 				instring = false;
 				syntaxtree->type = STRING;
 				char* string = es_tostring(extstring);
-				syntaxtree->content = string;
+				syntaxtree->content.string = string;
 				es_free(extstring);
 				extstring = NULL;
 			} else {
@@ -64,7 +64,7 @@ tSyntaxElement* parse(FILE* file) {
 				intoken = false;
 				syntaxtree->type = TOKEN;
 				char* string = es_tostring(exttoken);
-				syntaxtree->content = string;
+				syntaxtree->content.string = string;
 				es_free(exttoken);
 				exttoken = NULL;
 			} else {

src/printtree.c

@@ -12,13 +12,13 @@ void printtree(tSyntaxElement* syntaxtree, int depth) {
 	switch (syntaxtree->type) {
 		case TREE:
 			printf("TREE\n");
-			printtree((tSyntaxElement*)syntaxtree->content, depth + 1);
+			printtree(syntaxtree->content.syntax, depth + 1);
 			break;
 		case TOKEN:
-			printf("TOKEN: %s\n", (char*)syntaxtree->content);
+			printf("TOKEN: %s\n", syntaxtree->content.string);
 			break;
 		case STRING:
-			printf("STRING: %s\n", (char*)syntaxtree->content);
+			printf("STRING: %s\n", syntaxtree->content.string);
 			break;
 		case NONE:
 			printf("NONE\n");

src/process.c

@@ -9,13 +9,13 @@ bool replace(tSyntaxElement* tree, tProcessingData* pdata) {
 	tProcessingData* pd = pdata;
 	bool didreplace = false;
 	while (1) {
-		if (pd->replacethis == NULL)
+		if (pd->data.replace.replacethis == NULL)
 			break;
 		if (tree->type == TOKEN)
-			if (strcmp(tree->content, pd->replacethis) == 0) {
+			if (strcmp(tree->content.string, pd->data.replace.replacethis) == 0) {
 				didreplace = true;
-				free(tree->content);
+				free(tree->content.string);
-				tSyntaxElement* clone = se_clone_no_next(pd->replacewiththis, tree);
+				tSyntaxElement* clone = se_clone_no_next(pd->data.replace.replacewiththis, tree);
 				tree->content = clone->content;
 				tree->type = clone->type;
 			}
@@ -31,14 +31,15 @@ bool process_find(tSyntaxElement* tree, tProcessingData** p_pdata) {
 	tProcessingData* pd = *p_pdata;
 	bool deffound = false;
 	if (se_istraversable(tree))
-		if (((tSyntaxElement*)tree->content)->type == TOKEN && ((tSyntaxElement*)tree->content)->next != NULL) {
+		if (tree->content.syntax->type == TOKEN && tree->content.syntax->next != NULL) {
-			tSyntaxElement* token = (tSyntaxElement*)tree->content;
+			tSyntaxElement* token = tree->content.syntax;
-			if (strcmp((char*)token->content,"def") == 0) {
+			if (strcmp(token->content.string,"def") == 0) {
-				char* replacethis = token->next->content;
+				char* replacethis = token->next->content.string;
 				tSyntaxElement* replacewiththis = token->next->next;
 				tProcessingData* npd = malloc(sizeof(tSyntaxElement));
-				npd->replacethis = replacethis;
+				npd->type = REPLACE;
-				npd->replacewiththis = replacewiththis;
+				npd->data.replace.replacethis = replacethis;
+				npd->data.replace.replacewiththis = replacewiththis;
 				npd->prev = pd;
 				*p_pdata = npd;
 				deffound = true;
@@ -59,8 +60,14 @@ void process(tSyntaxElement* tree, tProcessingData* pdata) {
 	}
 	if (!deffound) {
 		if (se_istraversable(tree)) {
-			process((tSyntaxElement*)tree->content, pd);
+			process(tree->content.syntax, pd);
 		}
+		switch (pd->type) {
+			case REPLACE:
 				replace(tree, pd);
+				break;
+			case FUNCTION:
+				break;
+		}
 	}
 }

src/process.h

@@ -1,10 +1,34 @@
 #include <stdbool.h>
 #include "syntax.h"
 
-typedef struct ProcessingData {
+typedef enum {
-	struct ProcessingData* prev;
+	REPLACE,
+	FUNCTION
+} tProcessingType;
+
+
+
+typedef struct {
 	char* replacethis;
 	tSyntaxElement* replacewiththis;
+} tProcessingReplace;
+
+typedef struct {
+	char** args;
+	tSyntaxElement* body;
+} tProcessingFunction;
+
+
+
+typedef union {
+	tProcessingReplace replace;
+	tProcessingFunction function;
+} tuProcessingData;
+
+typedef struct ProcessingData {
+	struct ProcessingData* prev;
+	tProcessingType type;
+	tuProcessingData data;
 } tProcessingData;
 
 void process(tSyntaxElement*, tProcessingData*);

src/syntax.c

@@ -4,13 +4,13 @@
 #include "syntax.h"
 
 bool se_istraversable(tSyntaxElement* syntaxtree) {
-	return syntaxtree->type == TREE && syntaxtree->content != NULL;
+	return syntaxtree->type == TREE && syntaxtree->content.syntax != NULL;
 }
 
 tSyntaxElement* se_create(void) {
 	tSyntaxElement* syntaxelement = malloc(sizeof(tSyntaxElement));
 	syntaxelement->type = NONE;
-	syntaxelement->content = NULL;
+	syntaxelement->content.none = NULL;
 	syntaxelement->next = NULL;
 	syntaxelement->top = NULL;
 	return syntaxelement;
@@ -18,9 +18,9 @@ tSyntaxElement* se_create(void) {
 }
 
 tSyntaxElement* se_bottom(tSyntaxElement* syntaxelement) {
-	syntaxelement->content = se_create();
+	syntaxelement->content.syntax = se_create();
-	((tSyntaxElement*)syntaxelement->content)->top = syntaxelement;
+	syntaxelement->content.syntax->top = syntaxelement;
-	return ((tSyntaxElement*)syntaxelement->content);
+	return syntaxelement->content.syntax;
 }
 
 tSyntaxElement* se_next(tSyntaxElement* syntaxelement) {
@@ -39,12 +39,12 @@ void se_free(tSyntaxElement* syntaxtree) {
 			free(syntaxtree);
 			return;
 		case TREE:
-			if (syntaxtree->content != NULL) {
+			if (syntaxtree->content.syntax != NULL) {
-				se_free((tSyntaxElement*)syntaxtree->content);
+				se_free(syntaxtree->content.syntax);
 			}
 			break;
 		default:
-			free(syntaxtree->content);
+			free(syntaxtree->content.none);
 			break;
 	}
 	if (syntaxtree->next != NULL) {
@@ -59,8 +59,8 @@ tSyntaxElement* se_clone(tSyntaxElement* syntaxelement, tSyntaxElement* newtop)
 		case TREE:
 			clone = se_create();
 			clone->type = TREE;
-			if (syntaxelement->content != NULL)
+			if (syntaxelement->content.syntax != NULL)
-				clone->content = se_clone(syntaxelement->content, clone);
+				clone->content.syntax = se_clone(syntaxelement->content.syntax, clone);
 			if (syntaxelement->next != NULL)
 				clone->next = se_clone(syntaxelement->next, newtop);
 			break;
@@ -68,8 +68,8 @@ tSyntaxElement* se_clone(tSyntaxElement* syntaxelement, tSyntaxElement* newtop)
 		case STRING:
 			clone = se_create();
 			clone->type = syntaxelement->type;
-			clone->content = malloc(strlen(syntaxelement->content));
+			clone->content.string = malloc(strlen(syntaxelement->content.string));
-			strcpy(clone->content, syntaxelement->content);
+			strcpy(clone->content.string, syntaxelement->content.string);
 			if (syntaxelement->next != NULL)
 				clone->next = se_clone(syntaxelement->next, newtop);
 			break;

src/syntax.h

@@ -10,9 +10,15 @@ enum SyntaxElementType {
 	NONE
 };
 
+typedef union {
+	struct SyntaxElement* syntax;
+	char* string;
+	void* none;
+} tSyntaxContent;
+
 typedef struct SyntaxElement {
 	enum SyntaxElementType type;
-	void* content;
+	tSyntaxContent content;
 	struct SyntaxElement* next;
 	struct SyntaxElement* top;
 } tSyntaxElement;