| 8 |
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#include "copyright.h" |
| 9 |
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|
| 10 |
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#include <stdio.h> |
| 11 |
+ |
#include <string.h> |
| 12 |
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|
| 13 |
+ |
#include "rterror.h" |
| 14 |
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#include "calcomp.h" |
| 15 |
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| 16 |
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|
| 17 |
+ |
/* is child binary operation lower precedence than parent? */ |
| 18 |
+ |
static int |
| 19 |
+ |
lower_precedent_binop(int typ, EPNODE *ek) |
| 20 |
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{ |
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+ |
if (ek == NULL) |
| 22 |
+ |
return(0); |
| 23 |
+ |
switch (typ) { |
| 24 |
+ |
case '+': |
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+ |
return(0); |
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+ |
case '-': |
| 27 |
+ |
return(ek->type == '+'); |
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+ |
case '*': |
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+ |
return(strchr("+-", ek->type) != NULL); |
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+ |
case '/': |
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+ |
return(strchr("+-*", ek->type) != NULL); |
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+ |
case '^': |
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+ |
return(strchr("+-*/^", ek->type) != NULL); |
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+ |
} |
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+ |
return(0); /* child not binary op */ |
| 36 |
+ |
} |
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+ |
|
| 38 |
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void |
| 39 |
< |
eprint(ep, fp) /* print a parse tree */ |
| 40 |
< |
register EPNODE *ep; |
| 41 |
< |
FILE *fp; |
| 39 |
> |
eprint( /* print a parse tree */ |
| 40 |
> |
EPNODE *ep, |
| 41 |
> |
FILE *fp |
| 42 |
> |
) |
| 43 |
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{ |
| 44 |
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static EPNODE *curdef = NULL; |
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< |
register EPNODE *ep1; |
| 45 |
> |
EPNODE *ep1 = NULL; |
| 46 |
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|
| 47 |
< |
switch (ep->type) { |
| 47 |
> |
switch (ep==NULL ? -1 : ep->type) { |
| 48 |
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|
| 49 |
|
case VAR: |
| 50 |
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fputs(ep->v.ln->name, fp); |
| 79 |
|
fprintf(fp, "%.9g", ep->v.num); |
| 80 |
|
break; |
| 81 |
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|
| 58 |
– |
case UMINUS: |
| 59 |
– |
fputc('-', fp); |
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– |
eprint(ep->v.kid, fp); |
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– |
break; |
| 62 |
– |
|
| 82 |
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case CHAN: |
| 83 |
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fprintf(fp, "$%d", ep->v.chan); |
| 84 |
|
break; |
| 94 |
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eprint(ep->v.kid->sibling, fp); |
| 95 |
|
curdef = ep1; |
| 96 |
|
break; |
| 97 |
< |
|
| 97 |
> |
|
| 98 |
> |
case UMINUS: |
| 99 |
> |
fputc('-', fp); |
| 100 |
> |
if (ep->v.kid != NULL && strchr("+-*/^", ep->v.kid->type)) { |
| 101 |
> |
fputc('(', fp); |
| 102 |
> |
eprint(ep->v.kid, fp); |
| 103 |
> |
fputc(')', fp); |
| 104 |
> |
} else |
| 105 |
> |
eprint(ep->v.kid, fp); |
| 106 |
> |
break; |
| 107 |
> |
|
| 108 |
|
case '+': |
| 109 |
|
case '-': |
| 110 |
|
case '*': |
| 111 |
|
case '/': |
| 112 |
|
case '^': |
| 113 |
< |
fputc('(', fp); |
| 114 |
< |
eprint(ep->v.kid, fp); |
| 115 |
< |
fputc(' ', fp); |
| 116 |
< |
fputc(ep->type, fp); |
| 117 |
< |
fputc(' ', fp); |
| 118 |
< |
eprint(ep->v.kid->sibling, fp); |
| 119 |
< |
fputc(')', fp); |
| 113 |
> |
if (lower_precedent_binop(ep->type, ep->v.kid)) { |
| 114 |
> |
fputc('(', fp); |
| 115 |
> |
eprint(ep->v.kid, fp); |
| 116 |
> |
fputc(')', fp); |
| 117 |
> |
} else |
| 118 |
> |
eprint(ep->v.kid, fp); |
| 119 |
> |
if (ep->type != '^') { |
| 120 |
> |
fputc(' ', fp); |
| 121 |
> |
fputc(ep->type, fp); |
| 122 |
> |
fputc(' ', fp); |
| 123 |
> |
} else |
| 124 |
> |
fputc(ep->type, fp); |
| 125 |
> |
if (lower_precedent_binop(ep->type, ep->v.kid->sibling)) { |
| 126 |
> |
fputc('(', fp); |
| 127 |
> |
eprint(ep->v.kid->sibling, fp); |
| 128 |
> |
fputc(')', fp); |
| 129 |
> |
} else |
| 130 |
> |
eprint(ep->v.kid->sibling, fp); |
| 131 |
|
break; |
| 132 |
|
|
| 133 |
|
default: |
| 135 |
|
quit(1); |
| 136 |
|
|
| 137 |
|
} |
| 98 |
– |
|
| 138 |
|
} |
| 139 |
|
|
| 140 |
|
|
| 141 |
|
void |
| 142 |
< |
dprint(name, fp) /* print a definition (all if no name) */ |
| 143 |
< |
char *name; |
| 144 |
< |
FILE *fp; |
| 142 |
> |
dprint( /* print a definition (all if no name) */ |
| 143 |
> |
char *name, |
| 144 |
> |
FILE *fp |
| 145 |
> |
) |
| 146 |
|
{ |
| 147 |
< |
register EPNODE *ep; |
| 147 |
> |
EPNODE *ep; |
| 148 |
|
|
| 149 |
|
if (name == NULL) |
| 150 |
|
for (ep = dfirst(); ep != NULL; ep = dnext()) { |
