simple calculator example

1 files changed, 0 insertions, 85 deletions

diff --git a/lexer.c b/lexer.c
deleted file mode 100644
index 7ebf2e7..0000000
--- a/lexer.c
+++ /dev/null
@@ -1,85 +0,0 @@
-#include <stdio.h>
-#include <stdlib.h>
-#include <ctype.h>
-#include <string.h>
-
-struct token {
-    enum symbol {
-        LPAREN, RPAREN, STRING, IDEN, NUM
-    } sym;
-    
-    union {
-        char *iden;
-        int i;
-        char *str;
-    };
-};
-
-static struct token tok;
-
-static inline int issep(char c)
-{
-    return isspace(c) || c == '\0' || c == '}' || c == '{' || c == '"';
-}
-    
-static inline int tillsep(char *str)
-{
-    size_t i = 0;
-    while(!issep(str[i++]));
-    return i-1;
-}
-
-static inline char *substring(char *str, size_t sub_end)
-{
-    static char sub[128];
-    if(sub_end+1 > sizeof(sub)) return NULL;
-    
-    sub[sub_end+1] = '\0';
-    return memcpy(sub, str, sub_end);
-}
-
-static char *next_token(char *str)
-{
-    size_t off = 0;
-    char c0 = str[0];
-
-    if(c0 == '\0')  return NULL;
-    if(isspace(c0)) return next_token(str+1);
-    else {
-        off = tillsep(str);
-        if(off == 0) { // sep
-            switch(str[off++]) {
-            case '{': tok.sym = LPAREN; break;
-            case '}': tok.sym = RPAREN; break;
-            case '"':
-                while(str[off] != '"') if(str[off++] == '\0') return NULL;
-                tok.sym = STRING;
-                tok.str = strdup(substring(str, off));
-            }
-        } else if(isalpha(c0)) { // iden
-            tok.sym = IDEN;
-            tok.iden = strdup(substring(str, off));
-        } else if(c0 >= '0' && c0 <= '9') { // num
-            tok.sym = NUM;
-            tok.i = atoi(substring(str, off));
-        }
-    }
-    
-    return str+off;
-}
-
-int main(void)
-{
-    char *str = "blah 0 1 443 test{here}13}{1\"fdlkfjakl{fher}  fdsfj\" here {  {tok {";
-    while((str = next_token(str)))
-        switch(tok.sym) {
-        case LPAREN: printf("{ "); break;
-        case RPAREN: printf("} "); break;
-        case STRING: printf("\"%s\" ", tok.str); free(tok.str); break;
-        case IDEN:   printf("'%s' ", tok.iden); free(tok.iden); break;
-        case NUM:    printf("%d ", tok.i); break;
-        }
-    
-    printf("\n");
-    return 0;
-}