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/*
* 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.
*/
static char sccsid[] = "@(#) man2tcl.c 1.3 95/08/12 17:34:08";
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
/*
* Imported things that aren't defined in header files:
*/
/*
* Some <errno.h> define errno to be something complex and thread-aware; in
* that case we definitely do not want to declare errno ourselves!
*/
#ifndef errno
extern int errno;
#endif
/*
* 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;
#define PRINT(args) if (writeOutput) { printf args; }
#define PRINTC(chr) if (writeOutput) { putc((chr), stdout); }
/*
* Prototypes for functions defined in this file:
*/
static void DoMacro(char *line);
static void DoText(char *line);
static void QuoteText(char *string, int count);
/*
*----------------------------------------------------------------------
*
* main --
*
* This function 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(
int argc, /* Number of command-line arguments. */
char **argv) /* Values of command-line arguments. */
{
FILE *f;
#define MAX_LINE_SIZE 4000
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[0] == '\'')) && (line[1] == '\\') && (line[2] == '\"')) {
/*
* This line is a comment. Ignore it.
*/
continue;
}
if (strlen(line) >= MAX_LINE_SIZE -1) {
fprintf(stderr, "Too long line. Max is %d chars.\n",
MAX_LINE_SIZE - 1);
exit(1);
}
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 function 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(
char *line) /* The line of text that contains the macro
* invocation. */
{
char *p, *end;
int quote;
/*
* If there is no macro name, then just skip the whole line.
*/
if ((line[1] == 0) || (isspace(line[1]))) {
return;
}
PRINT(("macro"));
if (*line != '.') {
PRINT(("2"));
}
/*
* Parse the arguments to the macro (including the name), in order.
*/
p = line+1;
while (1) {
PRINTC(' ');
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 {
quote = 0;
for (end = p+1; (*end != 0) && (quote || !isspace(*end)); end++) {
if (*end == '\'') {
quote = !quote;
}
}
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;
}
}
PRINTC('\n');
}
/*
*----------------------------------------------------------------------
*
* DoText --
*
* This function 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(
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') {
PRINT(("tab\n"));
p++;
} else if (*p != '\\') {
/*
* Ordinary text.
*/
for (end = p+1; (*end != '\\') && (*end != 0); end++) {
/* Empty loop body. */
}
PRINT(("text "));
QuoteText(p, end-p);
PRINTC('\n');
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.
*/
PRINT(("font %c\n", p[1]));
p += 2;
} else if (*p == '-') {
PRINT(("dash\n"));
p++;
} else if (*p == 'e') {
PRINT(("text \\\\\n"));
p++;
} else if (*p == '.') {
PRINT(("text .\n"));
p++;
} else if (*p == '&') {
p++;
} else if (*p == '0') {
PRINT(("text { }\n"));
p++;
} else if (*p == '(') {
if ((p[1] == 0) || (p[2] == 0)) {
fprintf(stderr, "Bad \\( sequence on line %d.\n",
lineNumber);
status = 1;
} else {
PRINT(("char {\\(%c%c}\n", p[1], p[2]));
p += 3;
}
} else if (*p == 'N' && *(p+1) == '\'') {
int ch;
p += 2;
sscanf(p,"%d",&ch);
PRINT(("text \\u%04x\n", ch));
while(*p&&*p!='\'') p++;
p++;
} else if (*p != 0) {
PRINT(("char {\\%c}\n", *p));
p++;
}
}
}
PRINT(("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(
char *string, /* The line of text. */
int count) /* Number of characters to write from
* string. */
{
if (count == 0) {
PRINT(("{}"));
return;
}
for ( ; count > 0; string++, count--) {
switch (*string) {
case '\\':
if (*(string+1) == 'N' && *(string+2) == '\'') {
int ch;
string += 3;
count -= 3;
sscanf(string,"%d",&ch);
PRINT(("\\u%04x", ch));
while(count>0&&*string!='\'') {string++;count--;}
continue;
} else if (*(string+1) == '0') {
PRINT(("\\ "));
string++;
count--;
continue;
}
case '$': case '[': case '{': case ' ': case ';':
case '"': case '\t':
PRINTC('\\');
default:
PRINTC(*string);
}
}
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/
|
