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Alexander Rosenberg 2024-08-15 02:11:26 -07:00
commit 2d33b594c5
Signed by: Zander671
GPG Key ID: 5FD0394ADBD72730
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cmake_minimum_required(VERSION 3.15.0)
set(CMAKE_C_STANDARD 99)
set(CMAKE_EXPORT_COMPILE_COMMANDS YES)
project(simple-lisp)
set(SOURCE_FILES main.c parse.c lisp.c)
foreach(FILE IN LISTS SOURCE_FILES)
list(APPEND REAL_SOURCE_FILES "src/${FILE}")
endforeach()
add_executable(simple-lisp ${REAL_SOURCE_FILES})

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parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

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#include <stddef.h>
#include <stdbool.h>
#include <stdint.h>
#include <setjmp.h>
typedef enum {
LISP_TYPE_NIL = 0, // only one value, nil (unit type)
LISP_TYPE_SYMBOL,
LISP_TYPE_CONS,
LISP_TYPE_STRING,
LISP_TYPE_ARRAY,
LISP_TYPE_INT,
LISP_TYPE_FLOAT,
LISP_TYPE_FUNCTION,
LISP_TYPE_CLASS,
LISP_TYPE_HASH_TABLE,
LISP_TYPE_INSTANCE,
LISP_TYPE_POINTER,
LISP_N_NATIVE_TYPES,
} LispType;
typedef struct {
LispType type;
bool persist;
size_t ref_count;
} LispObject;
typedef struct {
LispObject parent;
bool skip_free;
char *text;
size_t length;
} LispString;
typedef struct {
LispObject parent;
LispString *name;
} LispSymbol;
typedef struct {
LispObject parent;
LispObject *car;
LispObject *cdr;
} LispCons;
#define CONS(car, cdr) ((void *) call_native(Fcons, 2, (car), (cdr)))
#define EMPTY_LIST ((LispCons *) Vnil)
#define DOLIST(cvar, list, body) \
for (LispCons *__dolist_c = list; CONSP(__dolist_c); __dolist_c = (void *) \
__dolist_c->cdr) { \
LispObject * cvar = __dolist_c->car; \
body \
}
typedef struct {
LispObject parent;
LispObject **data;
size_t length;
} LispArray;
#define DOARRAY(index, value, arr, body) \
for (size_t index = 0; index < (arr)->length; ++ index) { \
LispObject * value = (arr)->data[ index ]; \
body \
}
typedef struct {
LispObject parent;
int64_t value;
} LispInt;
typedef struct {
LispObject parent;
double value;
} LispFloat;
typedef struct {
LispObject parent;
LispString *doc;
bool nativep;
bool macrop;
union {
struct {
LispObject *(*action)(size_t argc, LispObject **argv);
size_t nparg;
size_t noarg;
bool rargp;
} native;
struct {
LispObject *form;
LispArray *pargs; // list of position arguments
LispArray *oargs; // list of optional positional arguments
LispSymbol *rarg; // name of the rest argument
} lisp;
};
} LispFunction;
#define LISP_HASH_TABLE_INITIAL_SIZE 32
struct LispHashTableBucket {
uint64_t hash;
LispObject *key;
LispObject *value;
struct LispHashTableBucket *next;
struct LispHashTableBucket *prev;
};
typedef struct {
LispObject parent;
size_t size;
size_t count;
struct LispHashTableBucket **data;
LispObject *hash_func;
LispObject *eq_func;
} LispHashTable;
#define DOHASH(kvar, vvar, table, body) \
for (size_t __dohash_i = 0; __dohash_i < (table)->size; ++__dohash_i) { \
struct LispHashTableBucket *__dohash_bucket = (table)->data[__dohash_i]; \
while (__dohash_bucket) { \
LispObject * kvar = __dohash_bucket->key; \
LispObject * vvar = __dohash_bucket->value; \
body \
__dohash_bucket = __dohash_bucket->next; \
} \
}
typedef struct _LispClass {
LispObject parent;
struct _LispClass *superclass;
LispSymbol *name;
LispSymbol *module;
LispFunction *constructor;
LispHashTable *slots; // (name . index)
size_t high_slot;
LispHashTable *methods; // (name . function)
} LispClass;
typedef struct {
LispObject parent;
LispClass *class;
LispArray *slots;
} LispInstance;
typedef struct {
LispObject parent;
void *data;
void (*free_func)(void *);
} LispPointer;
extern LispObject *native_type_symbols[LISP_N_NATIVE_TYPES];
extern LispSymbol *system_module;
extern LispInstance *current_error;
// Error classes
extern LispClass *error_class;
extern LispClass *type_error_class;
extern LispClass *argument_error_class;
extern LispClass *function_not_found_error_class;
extern LispClass *class_slot_error_class;
typedef struct {
LispString *file;
bool is_native;
size_t line;
size_t col;
} StackFramePlace;
typedef struct _StackFrame {
struct _StackFrame *up;
LispSymbol *block_name;
// (error class . int (to return from setjmp)) or nil
bool has_place;
StackFramePlace place;
LispHashTable *handlers;
jmp_buf *jmp;
LispHashTable *locals;
LispCons *extras; // extra objects to be unrefed
LispCons *cleanup; // list of cleanup forms
} StackFrame;
extern StackFrame *call_stack;
extern size_t call_stack_size;
#define AS_OBJECT(obj) ((LispObject *) (obj))
#define LISP_BOOL(obj) ((obj) ? Vt : Vnil)
#define TYPE_OF(obj) (AS_OBJECT(obj)->type)
#define COUNT_REFS(obj) (AS_OBJECT(obj)->ref_count)
#define LISP_DEFVAR(name) LispObject * V ## name
extern void *Vnil;
extern LISP_DEFVAR(t); // symbol
extern LISP_DEFVAR(module);
extern LISP_DEFVAR(all_functions); // hash table (symbol . (symbol . function))
extern LISP_DEFVAR(globals); // hash table (symbol . (symbol . any))
extern LISP_DEFVAR(classes); // hash table (symbol . (symbol. class))
void *ref_lisp_object(void *obj);
void *unref_lisp_object(void *obj);
void *lisp_check_type(LispType type, void *obj);
LispObject *call_native(LispObject *(*func)(size_t argc, LispObject **argv),
size_t argc, ...);
LispString *make_lisp_string(const char *text, size_t length,
bool skip_free);
LispInt *make_lisp_int(int64_t value);
LispFloat *make_lisp_float(double value);
LispSymbol *make_lisp_symbol(const char *text, size_t length, bool skip_free);
LispFunction *make_native_function(bool macrop, size_t nparg, size_t noarg, bool rargp,
LispObject *(*action)(size_t argc, LispObject **argv));
LispObject *lookup_in_module(LispHashTable *table, LispSymbol *module,
LispSymbol *name, bool include_system);
void register_in_module(LispHashTable *table, LispSymbol *module,
LispSymbol *name, LispObject *thing);
LispArray *make_lisp_array(size_t size, LispObject **init_data);
LispClass *make_lisp_class(LispSymbol *name, LispSymbol *module,
LispClass *superclass, LispFunction *constructor,
LispCons *slots);
LispInstance *make_lisp_instance(LispClass *class, LispHashTable *slots);
LispPointer *make_lisp_pointer(void *data, void(*free_func)(void *));
void push_stack(LispSymbol *block_name, StackFramePlace *place, jmp_buf *jmp,
LispHashTable *handlers);
void pop_stack(void);
void add_auto_unref(void *obj);
void dump_stack(LispInstance *error);
void throw_error(LispInstance *error);
LispClass *new_class(LispClass *superclass, LispSymbol *module,
const char *name, bool skip_free, LispFunction *constructor,
...);
LispInstance *new_instance(LispClass *class, ...);
#define ERROR(...) throw_error(new_instance(__VA_ARGS__, NULL))
#define TYPE_ERROR(exp, got) (ERROR(type_error_class, "expected", \
STRING_FROM_LITERAL(exp), "got", (got)))
bool instanceof(LispInstance *instance, LispClass *class);
size_t list_length(LispCons *list);
#define INTERN_LITERAL(name) \
(AS_OBJECT(make_lisp_symbol(name, sizeof(name) - 1, true)))
#define STRING_FROM_LITERAL(text) (make_lisp_string(text, sizeof(text) - 1, true))
void init_lisp(void);
void deinit_lisp(void);
#define LISP_DEFUN(name) LispObject * F ## name (size_t argc, LispObject **argv)
#define NILP(obj) (TYPE_OF(obj) == LISP_TYPE_NIL)
#define SYMBOLP(obj) (TYPE_OF(obj) == LISP_TYPE_SYMBOL)
#define AS_SYMBOL(obj) ((LispSymbol *) lisp_check_type(LISP_TYPE_SYMBOL, obj))
LISP_DEFUN(symbolp);
#define STRINGP(obj) (TYPE_OF(obj) == LISP_TYPE_STRING)
#define AS_STRING(obj) ((LispString *) lisp_check_type(LISP_TYPE_STRING, obj))
LISP_DEFUN(stringp);
#define CONSP(obj) (TYPE_OF(obj) == LISP_TYPE_CONS)
#define AS_CONS(obj) ((LispCons *) lisp_check_type(LISP_TYPE_CONS, obj))
LISP_DEFUN(consp);
#define ARRAYP(obj) (TYPE_OF(obj) == LISP_TYPE_ARRAY)
#define AS_ARRAY(obj) ((LispArray *) lisp_check_type(LISP_TYPE_ARRAY, obj))
LISP_DEFUN(arrayp);
#define INTP(obj) (TYPE_OF(obj) == LISP_TYPE_INT)
#define AS_INT(obj) ((LispInt *) lisp_check_type(LISP_TYPE_INT, obj))
LISP_DEFUN(intp);
#define FLOATP(obj) (TYPE_OF(obj) == LISP_TYPE_FLOAT)
#define AS_FLOAT(obj) ((LispFloat *) lisp_check_type(LISP_TYPE_FLOAT, obj))
LISP_DEFUN(floatp);
#define FUNCTIONP(obj) (TYPE_OF(obj) == LISP_TYPE_FUNCTION)
#define AS_FUNCTION(obj) ((LispFunction *) lisp_check_type(LISP_TYPE_FUNCTION, obj))
LISP_DEFUN(functionp);
#define HASH_TABLE_P(obj) (TYPE_OF(obj) == LISP_TYPE_HASH_TABLE)
#define AS_HASH_TABLE(obj) ((LispHashTable *) lisp_check_type(LISP_TYPE_HASH_TABLE, obj))
LISP_DEFUN(hash_table_p);
#define CLASSP(obj) (TYPE_OF(obj) == LISP_TYPE_CLASS)
#define AS_CLASS(obj) ((LispClass *) lisp_check_type(LISP_TYPE_CLASS, obj))
LISP_DEFUN(classp);
#define INSTANCEP(obj) (TYPE_OF(obj) == LISP_TYPE_INSTANCE)
#define AS_INSTANCE(obj) ((LispInstance *) lisp_check_type(LISP_TYPE_INSTANCE, obj))
LISP_DEFUN(instancep);
#define POINTERP(obj) (TYPE_OF(obj) == LISP_TYPE_POINTER)
#define AS_POINTER(obj) ((LispPointer *) lisp_check_type(LISP_TYPE_POINTER, obj))
LISP_DEFUN(pointerp);
// NOTE: this evaluates obj twice!!
#define LISTP(obj) (NILP(obj) || CONSP(obj))
LISP_DEFUN(listp);
#define ATOM(obj) (!CONSP(obj))
LISP_DEFUN(atom);
#define NATIVE(obj) (!INSTANCEP(obj))
LISP_DEFUN(native);
LISP_DEFUN(type_of);
#define TYPE_STR(obj) (((LispSymbol *) call_native(Ftype_of, 1, (obj)))->name)
LISP_DEFUN(cons);
LISP_DEFUN(list);
LISP_DEFUN(length);
LISP_DEFUN(intern);
LISP_DEFUN(not);
LISP_DEFUN(hash);
LISP_DEFUN(make_hash_table);
LISP_DEFUN(float);
LISP_DEFUN(eq);
LISP_DEFUN(gethash);
LISP_DEFUN(puthash);
LISP_DEFUN(remhash);
LISP_DEFUN(symbol_function);
LISP_DEFUN(funcall);
LISP_DEFUN(apply);
LISP_DEFUN(eval);
LISP_DEFUN(make_instance);
LISP_DEFUN(slot);
LISP_DEFUN(setslot);
LISP_DEFUN(array_to_list);
LISP_DEFUN(list_to_array);
LISP_DEFUN(superclassp);
LISP_DEFUN(subclassp);
LISP_DEFUN(hash_as_zero);
// These are special forms, they their argument are NOT evaluated
LISP_DEFUN(quote);
LISP_DEFUN(and);
LISP_DEFUN(or);

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#include <stdio.h>
#include "parse.h"
static const char *token_type_to_str(TokenType type) {
switch (type) {
case TOKEN_TYPE_EOF:
return "EOF";
case TOKEN_TYPE_COMMENT:
return "COMMENT";
case TOKEN_TYPE_PAREN:
return "PAREN";
case TOKEN_TYPE_BRACKET:
return "BRACKET";
case TOKEN_TYPE_SYMBOL:
return "SYMBOL";
case TOKEN_TYPE_QUOTE:
return "QUOTE";
case TOKEN_TYPE_NUMBER:
return "NUMBER";
case TOKEN_TYPE_CHAR:
return "CHAR";
case TOKEN_TYPE_STRING:
return "STRING";
default:
return "UNKNOWN";
}
}
int main(int argc, const char **argv) {
init_lisp();
LispObject *msg_slot = ref_lisp_object(INTERN_LITERAL("message"));
jmp_buf jmp;
int branch = setjmp(jmp);
if (!branch) {
LispHashTable *handlers = (void *) call_native(Fmake_hash_table, 2, Vnil, Vnil);
call_native(Fputhash, 3, handlers, type_error_class, make_lisp_int(1));
call_native(Fputhash, 3, handlers, class_slot_error_class, make_lisp_int(2));
StackFramePlace err_place = {
.file = STRING_FROM_LITERAL(__FILE__),
.is_native = true,
.line = __LINE__ - 3,
.col = 8,
};
push_stack((void *) INTERN_LITERAL(__FUNCTION__), &err_place, &jmp, handlers);
unref_lisp_object(handlers);
AS_STRING(Vnil);
} else if (branch == 1) {
LispString *msg = (void *) call_native(Fslot, 2, current_error, msg_slot);
printf("Caught %s: %*s\n",
current_error->class->name->name->text,
(int) msg->length, msg->text);
dump_stack(current_error);
}
unref_lisp_object(msg_slot);
pop_stack();
deinit_lisp();
return 0;
}

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#include "parse.h"
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
static void append_char(Token *token, char new_char) {
if (token->len >= token->buf_len) {
token->buf_len = token->len + 1;
token->text = realloc(token->text, token->buf_len);
}
token->text[token->len++] = new_char;
}
static void append_null_byte(Token *token) {
if (token->len >= token->buf_len) {
token->buf_len = token->len + 1;
token->text = realloc(token->text, token->buf_len);
}
token->text[token->len] = '\0';
}
static void copy_to_buffer(Token *token, const char *src, size_t src_len) {
if (src_len >= token->buf_len) {
token->buf_len = src_len + 1;
token->text = realloc(token->text, token->buf_len);
}
memcpy(token->text, src, src_len);
token->len = src_len;
token->text[src_len] = '\0';
}
static int issymbolend(int c) {
return isspace(c) || c == ')' || c == ']';
}
// takes the string arguments
static void token_stream_push_error(TokenStream *stream, Token *token,
char *desc) {
ParseError *err = malloc(sizeof(ParseError));
err->next = NULL;
err->col = token->col;
err->line = token->line;
err->desc = desc;
err->context = malloc(token->len + 1);
memcpy(err->context, token->text, token->len);
err->context[token->len] = '\0';
if (stream->error_tail) {
stream->error_tail->next = err;
} else {
stream->error_head = err;
}
stream->error_tail = err;
++stream->error_count;
token->type = TOKEN_TYPE_UNKNOWN;
copy_to_buffer(token, "", 0);
}
// src is taken by this function
TokenStream *make_token_stream(FILE *src) {
TokenStream *stream = malloc(sizeof(TokenStream));
stream->src = src;
stream->col = 0;
stream->line = 1;
stream->error_tail = NULL;
stream->error_head = NULL;
stream->error_count = 0;
return stream;
}
void destroy_token_stream(TokenStream *stream) {
while (stream->error_head) {
void *next = stream->error_head->next;
free(stream->error_head);
stream->error_head = next;
}
fclose(stream->src);
free(stream);
}
static void next_comment(TokenStream *stream, Token *token) {
char c;
while ((c = fgetc(stream->src)) != EOF) {
if (c == '\n') {
break;
}
append_char(token, c);
}
append_null_byte(token);
++stream->line;
stream->col = 0;
}
static void skip_while(TokenStream *stream, int(*pred)(int c), bool inv) {
char c;
while ((c = fgetc(stream->src)) != EOF &&
((!inv && pred(c)) || (inv && !pred(c)))) {
if (c == '\n') {
++stream->line;
stream->col = 0;
} else {
++stream->col;
}
}
ungetc(c, stream->src);
}
static void next_char(TokenStream *stream, Token *token) {
token->len = 1;
char c = fgetc(stream->src);
copy_to_buffer(token, &c, 1);
++stream->col;
}
static void next_string(TokenStream *stream, Token *token) {
bool backslash = false;
char c = fgetc(stream->src); // opening "
append_char(token, c);
while ((c = fgetc(stream->src)) != EOF && (backslash || c != '"')) {
if (c == '\\' && !backslash) {
backslash = true;
} else {
backslash = false;
append_char(token, c);
if (c == '\n') {
++stream->line;
stream->col = 0;
} else {
++stream->col;
}
}
}
++stream->col;
append_char(token, '"');
append_null_byte(token);
if (feof(stream->src)) {
token_stream_push_error(stream, token,
strdup("expected '\"', got EOF"));
}
}
static void next_symbol(TokenStream *stream, Token *token) {
char c;
bool backslash = false;
while ((c = fgetc(stream->src)) != EOF &&
(backslash || !issymbolend(c))) {
if (c == '\\' && !backslash) {
backslash = true;
} else {
backslash = false;
append_char(token, c);
}
}
append_null_byte(token);
ungetc(c, stream->src);
}
static void next_char_literal(TokenStream *stream, Token *token) {
fgetc(stream->src);
append_char(token, '#');
char c = fgetc(stream->src);
append_char(token, c);
stream->col += 2;
if (c == EOF) {
token_stream_push_error(stream, token,
strdup("expected character literal, got EOF"));
token->len = 0;
token->type = TOKEN_TYPE_UNKNOWN;
} else if (c == '\\') {
// named character literal, like "#\newline"
while ((c = fgetc(stream->src)) != EOF && isalpha(c)) {
append_char(token, c);
++stream->col;
}
}
append_null_byte(token);
c = fgetc(stream->src);
if (c != EOF && !issymbolend(c)) {
token_stream_push_error(stream, token,
strdup("character literal too long"));
skip_while(stream, &issymbolend, true);
} else {
ungetc(c, stream->src);
}
}
// we accept base = 2, 8, 10, and 16
static int isbasechar(char c, int base) {
if (c < '0') {
return false;
}
switch (base) {
case 16:
c = tolower(c);
if (c >= 'a' && c <= 'f') {
return true;
}
base = 10;
case 2:
case 8:
case 10:
return c <= '0' + (base - 1);
default:
return false;
}
}
static int get_base_from_token(Token *token) {
size_t i;
for (i = 0; i < token->len; ++i) {
if (token->text[i] != '0') {
break;
}
}
if (token->len - i == 1) {
switch (token->text[i]) {
case '2':
return 2;
case '8':
return 8;
}
return 0;
} else if (token->len - i == 2 && token->text[i] == '1') {
switch (token->text[i + 1]) {
case '0':
return 10;
case '6':
return 16;
}
return 0;
}
return 0;
}
static void next_number_or_symbol(TokenStream *stream, Token *token, char first_char) {
token->type = TOKEN_TYPE_NUMBER;
bool has_decimal = false;
bool has_base = false;
bool only_nums = true;
bool has_exp = false;
bool allow_plus_minus = false;
int base = 10;
bool has_num = isbasechar(first_char, 10);
if (first_char == '.') {
has_decimal = true;
only_nums = false;
} else if (first_char == '-' || first_char == '+') {
only_nums = false;
}
append_char(token, first_char);
char c;
while ((c = fgetc(stream->src)) != EOF && !issymbolend(c)) {
++stream->col;
if (c == '.') {
if (has_decimal || has_base) {
token->type = TOKEN_TYPE_SYMBOL;
ungetc(c, stream->src);
next_symbol(stream, token);
return;
}
only_nums = false;
has_decimal = true;
} else if (c == '#') {
if (has_base || !only_nums) {
token->type = TOKEN_TYPE_SYMBOL;
ungetc(c, stream->src);
next_symbol(stream, token);
return;
} else {
base = get_base_from_token(token);
if (base == 0) {
token->type = TOKEN_TYPE_SYMBOL;
ungetc(c, stream->src);
next_symbol(stream, token);
return;
}
}
has_base = true;
has_num = false;
allow_plus_minus = true;
append_char(token, c);
continue;
} else if (c == 'e') {
if (has_exp) {
token->type = TOKEN_TYPE_SYMBOL;
ungetc(c, stream->src);
next_symbol(stream, token);
return;
}
allow_plus_minus = true;
only_nums = false;
has_exp = true;
has_decimal = false; // the exponent can have a decimal point
append_char(token, c);
continue;
} else if (allow_plus_minus && (c == '+' || c == '-')) {
// fall-through
} else if (!isbasechar(c, base)) {
token->type = TOKEN_TYPE_SYMBOL;
ungetc(c, stream->src);
next_symbol(stream, token);
return;
}
has_num = true;
allow_plus_minus = false;
append_char(token, c);
}
if (!has_num) {
token->type = TOKEN_TYPE_SYMBOL;
}
append_null_byte(token);
ungetc(c, stream->src);
}
// return the number of errors after parsing
size_t token_stream_next(TokenStream *stream, Token *token) {
skip_while(stream, &isspace, false);
token->line = stream->line;
token->col = stream->col + 1;
token->len = 0;
char nc = fgetc(stream->src);
if (nc == EOF) {
token->type = TOKEN_TYPE_EOF;
copy_to_buffer(token, "", 0);
return stream->error_count;
}
ungetc(nc, stream->src);
if (nc == ';') {
token->type = TOKEN_TYPE_COMMENT;
next_comment(stream, token);
} else if (nc == '(' || nc == ')') {
token->type = TOKEN_TYPE_PAREN;
next_char(stream, token);
} else if (nc == '[' || nc == ']') {
token->type = TOKEN_TYPE_BRACKET;
next_char(stream, token);
} else if (nc == '\'') {
token->type = TOKEN_TYPE_QUOTE;
next_char(stream, token);
} else if (nc == '"') {
token->type = TOKEN_TYPE_STRING;
next_string(stream, token);
} else if (nc == '.') {
// look at character after the .
char chars[2];
fread(chars, 1, 2, stream->src);
ungetc(chars[1], stream->src);
if (isspace(chars[1])) {
++stream->col;
token->type = TOKEN_TYPE_SYMBOL;
copy_to_buffer(token, ".", 1);
} else {
// the . is part of something bigger
next_number_or_symbol(stream, token, chars[1]);
}
} else if (nc == '#') {
token->type = TOKEN_TYPE_CHAR;
next_char_literal(stream, token);
} else if (nc == '-' || nc == '+' || (nc >= '0' && nc <= '9')) {
next_number_or_symbol(stream, token, fgetc(stream->src));
} else {
token->type = nc == ':' ? TOKEN_TYPE_PROPERTY : TOKEN_TYPE_SYMBOL;
next_symbol(stream, token);
}
return stream->error_count;
}
void token_free(Token *token) {
free(token->text);
}
// return the number of errors left
ParseError *token_stream_error(TokenStream *stream) {
if (stream->error_count == 0) {
return NULL;
}
ParseError *error = stream->error_head;
stream->error_head = stream->error_head->next;
if (!stream->error_head) {
stream->error_tail = NULL;
}
error->next = NULL;
--stream->error_count;
return error;
}
void parse_error_free(ParseError *error) {
if (error) {
free(error->desc);
free(error->context);
free(error);
}
}
void read_native(FILE *src, LispObject ***result, size_t *result_len,
ParseError *errors, size_t *error_count) {
TokenStream *stream = make_token_stream(src);
errors = stream->error_head;
stream->error_head = NULL;
stream->error_tail = NULL;
stream->error_count = 0;
*error_count = stream->error_count;
destroy_token_stream(stream);
}

60
src/parse.h Normal file
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#include <stdio.h>
#include <stdbool.h>
#include "lisp.h"
typedef struct {
size_t line;
size_t col;
char *context;
char *desc;
void *next;
} ParseError;
typedef struct {
FILE *src;
size_t line;
size_t col;
ParseError *error_head;
ParseError *error_tail;
size_t error_count;
} TokenStream;
typedef enum {
TOKEN_TYPE_EOF,
TOKEN_TYPE_UNKNOWN,
TOKEN_TYPE_COMMENT,
TOKEN_TYPE_PAREN,
TOKEN_TYPE_BRACKET,
TOKEN_TYPE_SYMBOL,
TOKEN_TYPE_PROPERTY,
TOKEN_TYPE_QUOTE,
TOKEN_TYPE_CHAR,
TOKEN_TYPE_NUMBER,
TOKEN_TYPE_STRING,
} TokenType;
typedef struct {
TokenType type;
char *text;
size_t buf_len;
size_t len;
size_t line;
size_t col;
} Token;
// src is taken by this function
TokenStream *make_token_stream(FILE *src);
void destroy_token_stream(TokenStream *stream);
// return the number of errors after parsing
size_t token_stream_next(TokenStream *stream, Token *token);
void token_free(Token *token);
// return the number of errors left
ParseError *token_stream_error(TokenStream *stream);
void parse_error_free(ParseError *error);
void read_native(FILE *src, LispObject ***result, size_t *result_len,
ParseError *errors, size_t *error_count);