mirror of
https://github.com/kanaka/mal.git
synced 2024-09-11 21:57:38 +03:00
- Reorder README to have implementation list after "learning tool" bullet. - This also moves tests/ and libs/ into impls. It would be preferrable to have these directories at the top level. However, this causes difficulties with the wasm implementations which need pre-open directories and have trouble with paths starting with "../../". So in lieu of that, symlink those directories to the top-level. - Move the run_argv_test.sh script into the tests directory for general hygiene.
125 lines
3.7 KiB
Objective-C
125 lines
3.7 KiB
Objective-C
#import <Foundation/Foundation.h>
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#import "mal_readline.h"
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#import "types.h"
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#import "reader.h"
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#import "printer.h"
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#import "env.h"
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// read
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NSObject *READ(NSString *str) {
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return read_str(str);
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}
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// eval
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// forward declaration
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NSObject *EVAL(NSObject *ast, Env *env);
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NSObject *eval_ast(NSObject *ast, Env *env) {
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if ([ast isMemberOfClass:[MalSymbol class]]) {
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return [env get:(MalSymbol *)ast];
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} else if ([ast isKindOfClass:[NSArray class]]) {
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NSMutableArray *newLst = [NSMutableArray array];
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for (NSObject * x in (NSArray *)ast) {
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[newLst addObject:EVAL(x, env)];
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}
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if ([ast isKindOfClass:[MalVector class]]) {
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return [MalVector fromArray:newLst];
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} else {
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return newLst;
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}
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} else if ([ast isKindOfClass:[NSDictionary class]]) {
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NSMutableDictionary *newDict = [NSMutableDictionary dictionary];
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for (NSString * k in (NSDictionary *)ast) {
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newDict[k] = EVAL(((NSDictionary *)ast)[k], env);
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}
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return newDict;
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} else {
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return ast;
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}
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}
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NSObject *EVAL(NSObject *ast, Env *env) {
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//NSLog(@"EVAL: %@", ast);
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if (!list_Q(ast)) {
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return eval_ast(ast, env);
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}
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// apply list
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if ([(NSArray *)ast count] == 0) {
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return ast;
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}
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NSArray * alst = (NSArray *)ast;
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id a0 = alst[0];
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if (![a0 isKindOfClass:[MalSymbol class]]) {
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@throw @"attempt to apply on non-symbol";
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}
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if ([(NSString *)a0 isEqualTo:@"def!"]) {
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return [env set:((MalSymbol *)alst[1]) val:EVAL(alst[2], env)];
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} else if ([(NSString *)a0 isEqualTo:@"let*"]) {
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Env *let_env = [Env fromOuter:env];
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NSArray * binds = (NSArray *)alst[1];
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for (int i=0; i < [binds count]; i+=2) {
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[let_env set:binds[i] val:EVAL(binds[i+1], let_env)];
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}
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return EVAL(alst[2], let_env);
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} else {
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NSArray * el = (NSArray *) eval_ast(ast, env);
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NSObject * (^ f)(NSArray *) = el[0];
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NSArray * args = _rest(el);
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return f(args);
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}
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}
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// print
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NSString *PRINT(NSObject *exp) {
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return _pr_str(exp, true);
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}
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// REPL
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NSString *REP(NSString *line, Env *env) {
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return PRINT(EVAL(READ(line), env));
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}
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int main () {
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Env * repl_env = [[Env alloc] init];
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// Create an autorelease pool to manage the memory into the program
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NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
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// If using automatic reference counting (ARC), use @autoreleasepool instead:
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// @autoreleasepool {
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[repl_env set:(MalSymbol *)@"+" val:^(NSArray *args){
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return [NSNumber numberWithInt:[args[0] intValue] + [args[1] intValue]];
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}];
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[repl_env set:(MalSymbol *)@"-" val:^(NSArray *args){
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return [NSNumber numberWithInt:[args[0] intValue] - [args[1] intValue]];
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}];
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[repl_env set:(MalSymbol *)@"*" val:^(NSArray *args){
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return [NSNumber numberWithInt:[args[0] intValue] * [args[1] intValue]];
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}];
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[repl_env set:(MalSymbol *)@"/" val:^(NSArray *args){
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return [NSNumber numberWithInt:[args[0] intValue] / [args[1] intValue]];
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}];
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while (true) {
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char *rawline = _readline("user> ");
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if (!rawline) { break; }
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NSString *line = [NSString stringWithUTF8String:rawline];
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if ([line length] == 0) { continue; }
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@try {
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printf("%s\n", [[REP(line, repl_env) description] UTF8String]);
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} @catch(NSString *e) {
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printf("Error: %s\n", [e UTF8String]);
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} @catch(NSException *e) {
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if ([[e name] isEqualTo:@"ReaderContinue"]) { continue; }
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printf("Exception: %s\n", [[e reason] UTF8String]);
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}
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}
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[pool drain];
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// }
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}
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