| PulkoMandy | 17fc759 | 2022-07-28 18:27:54 +0200 | [diff] [blame] | 1 | |
| 2 | FILE *infile; |
| 3 | static int cur_char=' '; |
| 4 | |
| 5 | char tkname[MAXLEN]; |
| 6 | |
| 7 | int yylex() |
| 8 | { |
| 9 | char *p=tkname; |
| 10 | int tmp; |
| 11 | |
| 12 | while(isspace(cur_char)) |
| 13 | cur_char=getc(infile); |
| 14 | |
| 15 | if(isdigit(cur_char)){ |
| 16 | do{ |
| 17 | *p++=cur_char; |
| 18 | cur_char=getc(infile); |
| 19 | }while(isdigit(cur_char)); |
| 20 | if(cur_char=='.'){ |
| 21 | *p++=cur_char; |
| 22 | cur_char=getc(infile); |
| 23 | while(isdigit(cur_char)){ |
| 24 | *p++=cur_char; |
| 25 | cur_char=getc(infile); |
| 26 | } |
| 27 | } |
| 28 | *p++=0; |
| 29 | return TKNUMBER; |
| 30 | } |
| 31 | if(isalpha(cur_char)){ |
| 32 | do{ |
| 33 | *p++=cur_char; |
| 34 | cur_char=getc(infile); |
| 35 | }while(isalnum(cur_char)); |
| 36 | *p++=0; |
| 37 | if(!strcmp(tkname,"int")) |
| 38 | return TKINT; |
| 39 | if(!strcmp(tkname,"real")) |
| 40 | return TKREAL; |
| 41 | if(!strcmp(tkname,"if")) |
| 42 | return TKIF; |
| 43 | if(!strcmp(tkname,"else")) |
| 44 | return TKELSE; |
| 45 | if(!strcmp(tkname,"while")) |
| 46 | return TKWHILE; |
| 47 | if(!strcmp(tkname,"return")) |
| 48 | return TKRETURN; |
| 49 | return TKIDENTIFIER; |
| 50 | } |
| 51 | tmp=cur_char; |
| 52 | cur_char=getc(infile); |
| 53 | if(tmp=='!'&&cur_char=='='){ |
| 54 | cur_char=getc(infile); |
| 55 | return TKNEQ; |
| 56 | } |
| 57 | if(tmp=='<'&&cur_char=='='){ |
| 58 | cur_char=getc(infile); |
| 59 | return TKLEQ; |
| 60 | } |
| 61 | if(tmp=='>'&&cur_char=='='){ |
| 62 | cur_char=getc(infile); |
| 63 | return TKGEQ; |
| 64 | } |
| 65 | if(tmp=='&'&&cur_char=='&'){ |
| 66 | cur_char=getc(infile); |
| 67 | return TKAND; |
| 68 | } |
| 69 | if(tmp=='|'&&cur_char=='|'){ |
| 70 | cur_char=getc(infile); |
| 71 | return TKOR; |
| 72 | } |
| 73 | if(tmp==':'&&cur_char=='='){ |
| 74 | cur_char=getc(infile); |
| 75 | return TKASSIGN; |
| 76 | } |
| 77 | return tmp; |
| 78 | } |
| 79 | |