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#pragma once
#include <stdbool.h>
typedef struct InterState InterState;
typedef struct InterRet InterRet;
typedef struct AST AST;
typedef InterRet (*lambdafunc_t)(InterState *is,int nargs,AST **args);
typedef enum ASTtype{
AST_LIST,
AST_LAMBDA,
AST_LAMBDAARG,
AST_WORD,
AST_NUMBER,
AST_STRING,
AST_SYMBOL,
AST_QUOTED,
} ASTtype;
typedef struct ASTlist{
int len;
AST **nodes;
} ASTlist;
typedef struct ASTlambda{
//exactly one is non-NULL
lambdafunc_t cfunc;
AST *body;
} ASTlambda;
typedef struct ASTlambdaArg{
int idx;
} ASTlambdaArg;
typedef struct ASTword{
char *word;
} ASTword;
typedef struct ASTnumber{
double num;
} ASTnumber;
typedef struct ASTstring{
char *str;
int len;
} ASTstring;
typedef struct ASTsymbol{
char *name;
int symid;
//if you're not the interpreter:
// if you just allocated the ASTsymbol yourself, set symid to -1;
// else, leave symid alone.
//You should probably use ast_symbol(), in which case you don't have to do anything.
} ASTsymbol;
typedef struct ASTquoted{
AST *ast;
} ASTquoted;
struct AST{
ASTtype type;
union {
ASTlist li;
ASTlambda la;
ASTlambdaArg ar;
ASTword wo;
ASTnumber nu;
ASTstring st;
ASTsymbol sy;
ASTquoted qu;
};
};
void ast_free(AST *ast);
AST* ast_copy(const AST *ast);
char* ast_stringify(const AST *ast);
AST* ast_list(int len,AST **nodes); //these convenience functions DO NOT copy their arguments
AST* ast_lambda(lambdafunc_t cfunc,AST *body);
AST* ast_word(char *word);
AST* ast_number(double num);
AST* ast_string(char *str,int len);
AST* ast_symbol(char *name);
AST* ast_quoted(AST *ast);
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