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man2tcl.c
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C/C++ Source or Header
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1999-04-29
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8KB
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403 lines
/*
* man2tcl.c --
*
* This file contains a program that turns a man page of the
* form used for Tcl and Tk into a Tcl script that invokes
* a Tcl command for each construct in the man page. The
* script can then be eval'ed to translate the manual entry
* into some other format such as MIF or HTML.
*
* Usage:
*
* man2tcl ?fileName?
*
* Copyright (c) 1995 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* RCS: @(#) $Id: man2tcl.c,v 1.3 1999/04/16 00:47:40 stanton Exp $
*/
static char sccsid[] = "@(#) man2tcl.c 1.3 95/08/12 17:34:08";
#include <stdio.h>
#include <string.h>
#include <ctype.h>
/*
* Imported things that aren't defined in header files:
*/
extern int errno;
/*
* Current line number, used for error messages.
*/
static int lineNumber;
/*
* The variable below is set to 1 if an error occurs anywhere
* while reading in the file.
*/
static int status;
/*
* The variable below is set to 1 if output should be generated.
* If it's 0, it means we're doing a pre-pass to make sure that
* the file can be properly parsed.
*/
static int writeOutput;
/*
* Prototypes for procedures defined in this file:
*/
static void DoMacro(char *line);
static void DoText(char *line);
static void QuoteText(char *string, int count);
/*
*----------------------------------------------------------------------
*
* main --
*
* This procedure is the main program, which does all of the work
* of the program.
*
* Results:
* None: exits with a 0 return status to indicate success, or
* 1 to indicate that there were problems in the translation.
*
* Side effects:
* A Tcl script is output to standard output. Error messages may
* be output on standard error.
*
*----------------------------------------------------------------------
*/
int
main(argc, argv)
int argc; /* Number of command-line arguments. */
char **argv; /* Values of command-line arguments. */
{
FILE *f;
#define MAX_LINE_SIZE 500
char line[MAX_LINE_SIZE];
char *p;
/*
* Find the file to read, and open it if it isn't stdin.
*/
if (argc == 1) {
f = stdin;
} else if (argc == 2) {
f = fopen(argv[1], "r");
if (f == NULL) {
fprintf(stderr, "Couldn't read \"%s\": %s\n", argv[1],
strerror(errno));
exit(1);
}
} else {
fprintf(stderr, "Usage: %s ?fileName?\n", argv[0]);
}
/*
* Make two passes over the file. In the first pass, just check
* to make sure we can handle everything. If there are problems,
* generate output and stop. If everything is OK, make a second
* pass to actually generate output.
*/
for (writeOutput = 0; writeOutput < 2; writeOutput++) {
lineNumber = 0;
status = 0;
while (fgets(line, MAX_LINE_SIZE, f) != NULL) {
for (p = line; *p != 0; p++) {
if (*p == '\n') {
*p = 0;
break;
}
}
lineNumber++;
if ((line[0] == '\'') && (line[1] == '\\') && (line[2] == '\"')) {
/*
* This line is a comment. Ignore it.
*/
continue;
}
if ((line[0] == '.') || (line[0] == '\'')) {
/*
* This line is a macro invocation.
*/
DoMacro(line);
} else {
/*
* This line is text, possibly with formatting characters
* embedded in it.
*/
DoText(line);
}
}
if (status != 0) {
break;
}
fseek(f, 0, SEEK_SET);
}
exit(status);
}
/*
*----------------------------------------------------------------------
*
* DoMacro --
*
* This procedure is called to handle a macro invocation.
* It parses the arguments to the macro and generates a
* Tcl command to handle the invocation.
*
* Results:
* None.
*
* Side effects:
* A Tcl command is written to stdout.
*
*----------------------------------------------------------------------
*/
static void
DoMacro(line)
char *line; /* The line of text that contains the
* macro invocation. */
{
char *p, *end;
/*
* If there is no macro name, then just skip the whole line.
*/
if ((line[1] == 0) || (isspace(line[1]))) {
return;
}
if (writeOutput) {
printf("macro");
}
if (*line != '.') {
if (writeOutput) {
printf("2");
}
}
/*
* Parse the arguments to the macro (including the name), in order.
*/
p = line+1;
while (1) {
if (writeOutput) {
putc(' ', stdout);
}
if (*p == '"') {
/*
* The argument is delimited by quotes.
*/
for (end = p+1; *end != '"'; end++) {
if (*end == 0) {
fprintf(stderr,
"Unclosed quote in macro call on line %d.\n",
lineNumber);
status = 1;
break;
}
}
QuoteText(p+1, (end-(p+1)));
} else {
for (end = p+1; (*end != 0) && !isspace(*end); end++) {
/* Empty loop body. */
}
QuoteText(p, end-p);
}
if (*end == 0) {
break;
}
p = end+1;
while (isspace(*p)) {
/*
* Skip empty space before next argument.
*/
p++;
}
if (*p == 0) {
break;
}
}
if (writeOutput) {
putc('\n', stdout);
}
}
/*
*----------------------------------------------------------------------
*
* DoText --
*
* This procedure is called to handle a line of troff text.
* It parses the text, generating Tcl commands for text and
* for formatting stuff such as font changes.
*
* Results:
* None.
*
* Side effects:
* Tcl commands are written to stdout.
*
*----------------------------------------------------------------------
*/
static void
DoText(line)
char *line; /* The line of text. */
{
char *p, *end;
/*
* Divide the line up into pieces consisting of backslash sequences,
* tabs, and other text.
*/
p = line;
while (*p != 0) {
if (*p == '\t') {
if (writeOutput) {
printf("tab\n");
}
p++;
} else if (*p != '\\') {
/*
* Ordinary text.
*/
for (end = p+1; (*end != '\\') && (*end != 0); end++) {
/* Empty loop body. */
}
if (writeOutput) {
printf("text ");
}
QuoteText(p, end-p);
if (writeOutput) {
putc('\n', stdout);
}
p = end;
} else {
/*
* A backslash sequence. There are particular ones
* that we understand; output an error message for
* anything else and just ignore the backslash.
*/
p++;
if (*p == 'f') {
/*
* Font change.
*/
if (writeOutput) {
printf("font %c\n", p[1]);
}
p += 2;
} else if (*p == '-') {
if (writeOutput) {
printf("dash\n");
}
p++;
} else if (*p == 'e') {
if (writeOutput) {
printf("text \\\\\n");
}
p++;
} else if (*p == '.') {
if (writeOutput) {
printf("text .\n");
}
p++;
} else if (*p == '&') {
p++;
} else if (*p == '(') {
if ((p[1] == 0) || (p[2] == 0)) {
fprintf(stderr, "Bad \\( sequence on line %d.\n",
lineNumber);
status = 1;
} else {
if (writeOutput) {
printf("char {\\(%c%c}\n", p[1], p[2]);
}
p += 3;
}
} else if (*p != 0) {
if (writeOutput) {
printf("char {\\%c}\n", *p);
}
p++;
}
}
}
if (writeOutput) {
printf("newline\n");
}
}
/*
*----------------------------------------------------------------------
*
* QuoteText --
*
* Copy the "string" argument to stdout, adding quote characters
* around any special Tcl characters so that they'll just be treated
* as ordinary text.
*
* Results:
* None.
*
* Side effects:
* Text is written to stdout.
*
*----------------------------------------------------------------------
*/
static void
QuoteText(string, count)
char *string; /* The line of text. */
int count; /* Number of characters to write from string. */
{
if (count == 0) {
if (writeOutput) {
printf("{}");
}
return;
}
for ( ; count > 0; string++, count--) {
if ((*string == '$') || (*string == '[') || (*string == '{')
|| (*string == ' ') || (*string == ';') || (*string == '\\')
|| (*string == '"') || (*string == '\t')) {
if (writeOutput) {
putc('\\', stdout);
}
}
if (writeOutput) {
putc(*string, stdout);
}
}
}