Merge branch 'pretty_print' into dev

.gitignore

@@ -177,3 +177,4 @@ m4/ltversion.m4
 m4/lt~obsolete.m4
 
 Makefile
+*.svg

src/parser/parser.c

@@ -51,4 +51,4 @@ struct ast *get_ast_str(char *command)
 {
     (void)command;
     return NULL;
-}
+}

src/utils/ast/ast.c

@@ -1,31 +1,119 @@
 #include "ast.h"
 
+#include <assert.h>
 #include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
 
-void ast_free(struct ast **node)
+static void ast_print_dot_recursive(struct ast *node, FILE *out)
 {
-    if (*node == NULL)
+    if (!node)
         return;
-    // ast void does not need to be freed.
-    if (ast_is_if(*node))
-        ast_free_if(ast_get_if(*node));
-    else if (ast_is_command(*node))
-        ast_free_command(ast_get_command(*node));
-    else if (ast_is_list(*node))
-        ast_free_list(ast_get_list(*node));
-    else if (ast_is_and_or(*node))
-        ast_free_and_or(ast_get_and_or(*node));
-    else if (ast_is_redir(*node))
-        ast_free_redir(ast_get_redir(*node));
 
-    free(*node);
-    *node = NULL;
+    switch (node->type)
+    {
+    case AST_IF: {
+        struct ast_if *if_data = ast_get_if(node);
+        fprintf(out, "  node%p [label=\"IF\"];\n", (void *)node);
+
+        if (if_data->condition)
+        {
+            fprintf(out, "  node%p -> node%p;\n", (void *)node,
+                    (void *)if_data->condition);
+            fprintf(out,
+                    "  node%p [fillcolor=\"lightyellow\", style=\"filled\"];\n",
+                    (void *)if_data->condition);
+            ast_print_dot_recursive(if_data->condition, out);
+
+            if (if_data->then_clause)
+            {
+                fprintf(out, "  node%p -> node%p [label=\"true\"];\n",
+                        (void *)if_data->condition,
+                        (void *)if_data->then_clause);
+                ast_print_dot_recursive(if_data->then_clause, out);
+            }
+
+            if (if_data->else_clause)
+            {
+                fprintf(out, "  node%p -> node%p [label=\"false\"];\n",
+                        (void *)if_data->condition,
+                        (void *)if_data->else_clause);
+                ast_print_dot_recursive(if_data->else_clause, out);
+            }
+        }
+        break;
+    }
+    case AST_CMD: {
+        struct ast_cmd *cmd_data = ast_get_cmd(node);
+        fprintf(out, "  node%p [label=\"", (void *)node);
+        struct list *l = cmd_data->cmd;
+        while (l)
+        {
+            fprintf(out, "%s", (char *)l->data);
+            if (l->next)
+                fprintf(out, " ");
+            l = l->next;
+        }
+        fprintf(out, "\"];\n");
+        break;
+    }
+    case AST_END:
+        fprintf(out, "  node%p [label=\"END\"];\n", (void *)node);
+        break;
+    default:
+        break;
+    }
 }
 
-struct ast *ast_create(enum ast_type type, void *data)
+void ast_print_dot(struct ast *ast)
+{
+    if (!ast)
+        return;
+
+    FILE *dot_pipe = popen("dot -Tsvg -o ast.svg", "w");
+    if (!dot_pipe)
+    {
+        return;
+    }
+
+    fprintf(dot_pipe, "digraph AST {\n");
+    ast_print_dot_recursive(ast, dot_pipe);
+    fprintf(dot_pipe, "}\n");
+    pclose(dot_pipe);
+
+    system("open ast.svg");
+}
+
+bool ast_is_if(struct ast *node)
+{
+    assert(node != NULL);
+    return node->type == AST_IF;
+}
+
+bool ast_is_cmd(struct ast *node)
+{
+    assert(node != NULL);
+    return node->type == AST_CMD;
+}
+
+struct ast_if *ast_get_if(struct ast *node)
+{
+    assert(node != NULL);
+    assert(node->type == AST_IF);
+    return (struct ast_if *)node->data;
+}
+
+struct ast_cmd *ast_get_cmd(struct ast *node)
+{
+    assert(node != NULL);
+    assert(node->type == AST_CMD);
+    return (struct ast_cmd *)node->data;
+}
+
+static struct ast *ast_create(enum ast_type type, void *data)
 {
     struct ast *node = malloc(sizeof(struct ast));
-    if (node == NULL)
+    if (!node)
         return NULL;
 
     node->type = type;
@@ -33,3 +121,28 @@ struct ast *ast_create(enum ast_type type, void *data)
 
     return node;
 }
+
+struct ast *ast_create_if(struct ast *condition, struct ast *then_clause,
+                          struct ast *else_clause)
+{
+    struct ast_if *if_data = malloc(sizeof(struct ast_if));
+    if (!if_data)
+        return NULL;
+
+    if_data->condition = condition;
+    if_data->then_clause = then_clause;
+    if_data->else_clause = else_clause;
+
+    return ast_create(AST_IF, if_data);
+}
+
+struct ast *ast_create_cmd(struct list *cmd)
+{
+    struct ast_cmd *cmd_data = malloc(sizeof(struct ast_cmd));
+    if (!cmd_data)
+        return NULL;
+
+    cmd_data->cmd = cmd;
+
+    return ast_create(AST_CMD, cmd_data);
+}

src/utils/ast/ast.h

@@ -10,4 +10,9 @@
 #include "ast_redir.h"
 #include "ast_void.h"
 
+/**
+ * Prints the Graphviz DOT representation of the given AST to stdout.
+ */
+void ast_print_dot(struct ast *ast);
+
 #endif /* ! AST_H */