add first draft to eval a form
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parent
62cb03ebf0
commit
3ba49003f3
129
tokenize.l
129
tokenize.l
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@ -26,6 +26,7 @@ struct ast {
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} v;
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struct ast *next;
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};
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enum asttype {
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AST_TOK = 400,
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@ -88,101 +89,155 @@ make_token(enum yytokentype type, int num, char* str)
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}
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struct ast*
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make_ast(enum asttype type, struct token *t, struct ast *n) {
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make_ast(enum asttype type, struct token *t)
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{
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struct ast *a = (struct ast*) calloc(1, sizeof(struct ast));
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if (a == NULL)
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err(1, "malloc failed");
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a->type = type;
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if (type == AST_TOK)
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a->v.token = t;
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else if (type == AST_LIST)
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a->v.list = n;
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/* else if (type == AST_LIST) */
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/* a->v.list = n; */
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return a;
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}
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struct token *next;
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struct ast*
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parse(struct token *t)
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{
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if (t == NULL)
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err(1, "Unexpected token: <NULL>");
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if (t->type == LPAR) {
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struct ast *head;
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struct ast *a = head = make_ast(AST_LIST, NULL, NULL);
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if (t->type == LPAR) {
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struct ast *head = make_ast(AST_LIST, NULL);
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struct ast *a, *p;
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t = t->next;
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assert (t != NULL);
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while (t->type != RPAR) {
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a->next = parse(t);
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t = t->next;
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assert (t != NULL);
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a = parse(t);
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if (a == NULL)
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err(1, "syntax error");
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if (head->v.list == NULL) {
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p = head->v.list = a;
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} else {
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p->next = a;
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}
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p = a;
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t = next; /* skip all tokens that are processed */
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assert(t != NULL);
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}
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fprintf(stderr, "a=%p, t=%p\n", a, t);
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assert(t->type == RPAR);
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t = t->next;
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next = t;
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return head;
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} else if (t->type == NUM) {
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printf("is a number %d\n", t->v.num);
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return make_ast(AST_TOK, t, NULL);
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next = t->next;
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return make_ast(AST_TOK, t);
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} else if (t->type == SYM) {
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printf("is a sym: %s\n", t->v.str);
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return make_ast(AST_TOK, t, NULL);
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printf("is a sym: %s (%p)\n", t->v.str, t);
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next = t->next;
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return make_ast(AST_TOK, t);
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} else if (t->type == STR) {
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next = t->next;
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printf("is a str: %s\n", t->v.str);
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return make_ast(AST_TOK, t, NULL);
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return make_ast(AST_TOK, t);
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}
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return NULL;
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}
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void
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debug_token(struct token *x) {
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fprintf(stderr, "%d: ", x->type);
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if (x->type == NUM) fprintf(stderr, "%d", x->v.num);
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debug_token(struct token *x, indent) {
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for (int i = 0; i < indent; i++) putc(' ', stderr);
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fprintf(stderr, "%d: (%p)", x->type, x);
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if (x->type == NUM) fprintf(stderr, "%d @ %p", x->v.num, x);
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if (x->type == STR || x->type == SYM)
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fprintf(stderr, "%s", x->v.str);
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putc('\n', stderr);
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}
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void
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debug_ast(struct ast *a) {
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debug_ast(struct ast *a, indent) {
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while (a) {
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fprintf(stderr, "AST: %s", (a->type == AST_TOK) ? "AST_TOK" :
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"AST_LIST");
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fprintf(stderr, " [%p]", (a->type == AST_TOK) ? a->v.list :
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a->v.token);
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for (int i = 0; i < indent; i++) putc(' ', stderr);
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fprintf(stderr, "AST: %s,a=%p,list=%p,token=%p,next=%p", (a->type == AST_TOK) ? "AST_TOK" :
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"AST_LIST", a, a->v.list, a->v.token, a->next);
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putc('\n', stderr);
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if (a->type == AST_LIST) debug_ast(a->v.list);
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if (a->type == AST_LIST) {
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fprintf(stderr, "enter %p\n", a->v.list);
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fprintf(stderr, "==\n");
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debug_ast(a->v.list, indent+4);
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fprintf(stderr, "==\n");
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}
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else if(a->type == AST_TOK)
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debug_token(a->v.token);
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debug_token(a->v.token, indent);
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a = a->next;
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}
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}
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struct ast *
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eval(struct ast *a)
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{
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if (a->type == AST_TOK) {
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if (a->v.token->type == NUM) {
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return make_ast(AST_TOK, a->v.token);
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}
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else if (a->v.token->type == SYM) {
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if (strcmp(a->v.token->v.str, "def") == 0) {
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printf("define: %s\n", a->next->v.token->v.str);
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/* x = eval a->next->next */
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/* install: var:=x */
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}
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} else if (a->v.token->type == STR)
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fprintf(stderr, "str\n");
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} else if (a->type == AST_LIST) {
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eval(a->v.list);
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} else {
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fprintf(stderr, "%d\n", a->type);
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assert(0);
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}
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return NULL;
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}
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void
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pr(struct ast *a)
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{
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switch (a->type) {
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case AST_TOK:
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if (a->v.token->type == NUM)
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printf("%d\n", a->v.token->v.num);
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}
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}
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int main(void)
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{
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int tok;
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struct token *t, *u = NULL, *start = NULL;
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while(tok = yylex()) {
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//printf("token: %d, %d, %s\n", tok, yylval, yytext);
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//printf("t=%p\n", t);
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//if(t->type == NUMBER) printf(" = %d\n", t->v.num);
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/* form=read_form() .. */
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/* eval(form) */
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/* read token and create list */
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t = make_token(tok, yylval, yytext);
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if (start == NULL) start = t;
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if (u == NULL) u = t;
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else u->next = t;
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u = t;
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/* if EOL is reached, parse and evaluate form: */
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if (t->type == EOL) {
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struct token *x = start;
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while (x != NULL) {
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debug_token(x);
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x = x->next;
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}
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// while (x != NULL) {debug_token(x, 0); x = x->next;}
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struct ast *tl = parse(start);
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debug_ast(tl);
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/* XXX: eval(parse(start)) */
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/* struct ast *tl = parse(start); */
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/* eval(tl); */
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eval(parse(start));
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//debug_ast(tl, 1);
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/* start anew: */
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start = NULL;
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}
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}
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