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MiniMathParser.m
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144 lines (104 loc) · 3.72 KB
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#import "MiniMathParser.h"
#import <ParseKit/ParseKit.h>
#define LT(i) [self LT:(i)]
#define LA(i) [self LA:(i)]
#define LS(i) [self LS:(i)]
#define LF(i) [self LF:(i)]
#define POP() [self.assembly pop]
#define POP_STR() [self _popString]
#define POP_TOK() [self _popToken]
#define POP_BOOL() [self _popBool]
#define POP_INT() [self _popInteger]
#define POP_FLOAT() [self _popDouble]
#define PUSH(obj) [self.assembly push:(id)(obj)]
#define PUSH_BOOL(yn) [self _pushBool:(BOOL)(yn)]
#define PUSH_INT(i) [self _pushInteger:(NSInteger)(i)]
#define PUSH_FLOAT(f) [self _pushDouble:(double)(f)]
#define EQ(a, b) [(a) isEqual:(b)]
#define NE(a, b) (![(a) isEqual:(b)])
#define EQ_IGNORE_CASE(a, b) (NSOrderedSame == [(a) compare:(b)])
#define ABOVE(fence) [self.assembly objectsAbove:(fence)]
#define LOG(obj) do { NSLog(@"%@", (obj)); } while (0);
#define PRINT(str) do { printf("%s\n", (str)); } while (0);
@interface PKSParser ()
@property (nonatomic, retain) NSMutableDictionary *_tokenKindTab;
@property (nonatomic, retain) NSMutableArray *_tokenKindNameTab;
- (BOOL)_popBool;
- (NSInteger)_popInteger;
- (double)_popDouble;
- (PKToken *)_popToken;
- (NSString *)_popString;
- (void)_pushBool:(BOOL)yn;
- (void)_pushInteger:(NSInteger)i;
- (void)_pushDouble:(double)d;
@end
@interface MiniMathParser ()
@end
@implementation MiniMathParser
- (id)init {
self = [super init];
if (self) {
self._tokenKindTab[@"*"] = @(MINIMATHPARSER_TOKEN_KIND_STAR);
self._tokenKindTab[@"("] = @(MINIMATHPARSER_TOKEN_KIND_OPEN_PAREN);
self._tokenKindTab[@"+"] = @(MINIMATHPARSER_TOKEN_KIND_PLUS);
self._tokenKindTab[@")"] = @(MINIMATHPARSER_TOKEN_KIND_CLOSE_PAREN);
self._tokenKindNameTab[MINIMATHPARSER_TOKEN_KIND_STAR] = @"*";
self._tokenKindNameTab[MINIMATHPARSER_TOKEN_KIND_OPEN_PAREN] = @"(";
self._tokenKindNameTab[MINIMATHPARSER_TOKEN_KIND_PLUS] = @"+";
self._tokenKindNameTab[MINIMATHPARSER_TOKEN_KIND_CLOSE_PAREN] = @")";
}
return self;
}
- (void)_start {
[self expr];
[self matchEOF:YES];
}
- (void)expr {
[self addExpr];
}
- (void)addExpr {
[self multExpr];
while ([self predicts:MINIMATHPARSER_TOKEN_KIND_PLUS, 0]) {
if ([self speculate:^{ [self match:MINIMATHPARSER_TOKEN_KIND_PLUS discard:YES]; [self multExpr]; [self execute:(id)^{PUSH_FLOAT(POP_FLOAT() + POP_FLOAT ());}];}]) {
[self match:MINIMATHPARSER_TOKEN_KIND_PLUS discard:YES];
[self multExpr];
[self execute:(id)^{
PUSH_FLOAT(POP_FLOAT() + POP_FLOAT ());
}];
} else {
break;
}
}
}
- (void)multExpr {
[self primary];
while ([self predicts:MINIMATHPARSER_TOKEN_KIND_STAR, 0]) {
if ([self speculate:^{ [self match:MINIMATHPARSER_TOKEN_KIND_STAR discard:YES]; [self primary]; [self execute:(id)^{ PUSH_FLOAT(POP_FLOAT() * POP_FLOAT());}];}]) {
[self match:MINIMATHPARSER_TOKEN_KIND_STAR discard:YES];
[self primary];
[self execute:(id)^{
PUSH_FLOAT(POP_FLOAT() * POP_FLOAT());
}];
} else {
break;
}
}
}
- (void)primary {
if ([self predicts:TOKEN_KIND_BUILTIN_NUMBER, 0]) {
[self atom];
} else if ([self predicts:MINIMATHPARSER_TOKEN_KIND_OPEN_PAREN, 0]) {
[self match:MINIMATHPARSER_TOKEN_KIND_OPEN_PAREN discard:YES];
[self expr];
[self match:MINIMATHPARSER_TOKEN_KIND_CLOSE_PAREN discard:YES];
} else {
[self raise:@"No viable alternative found in rule 'primary'."];
}
}
- (void)atom {
[self matchNumber:NO];
[self execute:(id)^{
PUSH_FLOAT(POP_FLOAT());
}];
}
@end