95 lines
1.8 KiB
C
95 lines
1.8 KiB
C
#ifndef AST_H
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#define AST_H
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#include <stdbool.h>
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#include "../lists/lists.h"
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enum ast_type
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{
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AST_END,
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AST_LIST,
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AST_IF,
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AST_CMD
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};
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struct ast_cmd
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{
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struct list *cmd; // A list of words (char*)
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};
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struct ast_if
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{
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struct ast *condition;
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struct ast *then_clause;
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struct ast *else_clause;
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};
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struct ast
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{
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enum ast_type type;
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/**
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* Data associated with this AST node. It can be one of the following:
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* - NULL (AST_END)
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* - struct ast_if* (AST_IF)
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* - struct ast_cmd* (AST_CMD)
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*/
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void *data;
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};
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struct ast_list
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{
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struct list *children; // A list of ASTs (ast*)
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};
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/**
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* Checks if the given AST node is an if statement.
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*/
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bool ast_is_if(struct ast *node);
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/**
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* Checks if the given AST node is a command.
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*/
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bool ast_is_cmd(struct ast *node);
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/**
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* Checks if the given AST node is a command.
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*/
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bool ast_is_list(struct ast *node);
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/**
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* Retrieves the if statement data from the given AST node.
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* Assumes that the node is of type AST_IF.
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*/
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struct ast_if *ast_get_if(struct ast *node);
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/**
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* Retrieves the command data from the given AST node.
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* Assumes that the node is of type AST_CMD.
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*/
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struct ast_cmd *ast_get_cmd(struct ast *node);
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/**
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* Retrieves the command data from the given AST node.
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* Assumes that the node is of type AST_LIST.
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*/
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struct ast_list *ast_get_list(struct ast *node);
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/**
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* Creates a new AST node representing an if statement.
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*/
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struct ast *ast_create_if(struct ast *condition, struct ast *then_clause,
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struct ast *else_clause);
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/**
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* Creates a new AST node representing a command.
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*/
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struct ast *ast_create_cmd(struct list *cmd);
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/**
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* Creates a new AST node representing a list of ASTs
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*/
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struct ast* ast_create_list(struct list* ast_list);
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#endif /* ! AST_H */
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