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finduses.nw
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LaTeX Document
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1995-02-24
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5KB
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141 lines
\section{Scanning for uses of identifiers}
\subsection{Main program}
<<*>>=
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "errors.h"
#include "match.h"
#include "getline.h"
#include "recognize.h"
These choices of alphanumerics and symbols seem to work for most languages.
Making [[@]] alphanumeric helps {\LaTeX}, and making [[#]]
alphanumeric helps avoid false hits on C preprocessor directives like
[[#define]] and [[#include]].
<<*>>=
static Recognizer nwindex;
#define ALPHANUM "_'@ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789#"
#define SYMBOLS "!%^&*-+:=|~<>./?`"
/* note $ and \ both delimiters */
@ %def ALPHANUM SYMBOLS
By default, find uses within quoted code ([[[[...]]]]).
<<*>>=
static int showquotes = 1;
<<typedefs>>
<<local prototypes>>
<<*>>=
main(int argc, char **argv) {
FILE *fp;
char *myself = *argv;
int i;
for (i = 1; i < argc && argv[i][0] == '-' && argv[i][1] != 0; i++)
if (!strcmp(argv[i], "-noquote"))
showquotes = 0;
else
errormsg(Error, "%s: unknown option -%c\n", myself, argv[i][1]);
nwindex = new_recognizer(ALPHANUM, SYMBOLS);
if (i == argc) {
<<add uses to stdin, grabbing defns from stdin>>
} else {
<<read identifiers to be defined from files named in [[argv]]>>
stop_adding(nwindex);
add_use_markers(stdin, stdout);
}
exit(errorlevel);
return errorlevel; /* slay warning */
<<read identifiers to be defined from files named in [[argv]]>>=
for (; i < argc; i++)
if ((fp=fopen(argv[i],"r"))==NULL)
errormsg(Error, "%s: couldn't open file %s\n", myself, argv[i]);
else {
read_ids(fp);
fclose(fp);
}
<<local prototypes>>=
static void read_ids(FILE *in);
<<*>>=
static void read_ids(FILE *in) {
char *line;
while ((line = getline(in)) != NULL) {
if (line[strlen(line)-1] == '\n') line[strlen(line)-1] = 0;
add_ident(nwindex, line);
}
@ %def read_ids
<<add uses to stdin, grabbing defns from stdin>>=
{ FILE *tmp = tmpfile();
char *line;
if (tmp == NULL) <<complain about opening temp file and exit>>
while ((line = getline(stdin)) != NULL) {
if (fputs(line, tmp) == EOF) <<complain about writing temp file and exit>>
if (is_index(line, "defn")) {
if (line[strlen(line)-1] == '\n') line[strlen(line)-1] = 0;
add_ident(nwindex, line+1+5+1+4+1);
} else if (is_index(line, "localdefn")) {
if (line[strlen(line)-1] == '\n') line[strlen(line)-1] = 0;
add_ident(nwindex, line+1+5+1+9+1);
}
}
rewind(tmp);
stop_adding(nwindex);
add_use_markers(tmp, stdout);
<<typedefs>>=
typedef struct line_and_outfile {
char *line;
FILE *out;
} LineOut;
<<local prototypes>>=
static void add_use_markers(FILE *in, FILE *out);
<<*>>=
static void add_use_markers(FILE *in, FILE *out) {
char *line;
int incode = 0;
LineOut info; info.line = (char *)0; info.out = out;
while ((line = getline(in)) != NULL) {
if (is_begin(line, "code") || showquotes && is_keyword(line, "quote"))
incode = 1;
else if (is_end(line, "code") || is_keyword(line, "endquote"))
incode = 0;
if (is_keyword(line, "text") && incode) {
info.line = line + 6; /* skip "@text " */
search_for_ident(nwindex, line, write_index_use, &info);
if (*info.line && *info.line != '\n')
fprintf(out, "@text %s", info.line); /* has newline */
} else
fprintf(out, "%s", line);
}
@ %def add_use_markers
We gradually cut out the uses, and the tail of the line is left in [[info.line]],
to be printed by the code above.
There's a tricky bug lurking here---if one identifier is a prefix of another,
but both are recognized (as with the C$++$ [[::]] separator), we have to avoid
writing them both out in full, because that would duplicate text unnecessarily.
As a result, we always emit the line in pieces.
The function [[emit_up_to(f, s, limit)]] emits the piece of the string [[s]] up to
but not including [[limit]], if any.
It returns [[limit]] or [[s]], whichever is greater.
<<*>>=
static void write_index_use(void *closure, char *id, char *instance) {
LineOut *info = (LineOut *) closure;
info->line = emit_up_to(info->out, info->line, instance);
fprintf(info->out, "@index use %s\n", id);
info->line = emit_up_to(info->out, info->line, instance + strlen(id));
@ %def write_index_use
<<*>>=
static char *emit_up_to(FILE *f, char *s, char *limit) {
if (s < limit) {
char saved = *limit;
*limit = 0;
fprintf(f, "@text %s\n", s);
*limit = saved;
return limit;
} else {
return s;
<<local prototypes>>=
static void write_index_use(void *closure, char *id, char *instance);
static char *emit_up_to(FILE *f, char *s, char *limit);
<<complain about opening temp file and exit>>=
errormsg(Fatal, "%s: couldn't open temporary file\n");
<<complain about writing temp file and exit>>=
errormsg(Fatal, "%s: error writing temporary file\n");