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/src/main.c (raw)
#define _XOPEN_SOURCE 600
#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "str.h"
#include "unicode.h"
#include "util.h"
static struct str *parse_section(struct parser *p) {
struct str *section = str_create();
uint32_t ch;
char *subsection;
while ((ch = parser_getch(p)) != UTF8_INVALID) {
if (ch < 0x80 && isalnum((unsigned char)ch)) {
int ret = str_append_ch(section, ch);
assert(ret != -1);
} else if (ch == ')') {
if (section->len == 0) {
break;
}
int sec = strtol(section->str, &subsection, 10);
if (section->str == subsection) {
parser_fatal(p, "Expected section digit");
break;
}
if (sec < 0 || sec > 9) {
parser_fatal(p, "Expected section between 0 and 9");
break;
}
return section;
} else {
parser_fatal(p, "Expected alphanumerical character or )");
break;
}
};
parser_fatal(p, "Expected manual section");
return NULL;
}
static struct str *parse_extra(struct parser *p) {
struct str *extra = str_create();
int ret = str_append_ch(extra, '"');
assert(ret != -1);
uint32_t ch;
while ((ch = parser_getch(p)) != UTF8_INVALID) {
if (ch == '"') {
ret = str_append_ch(extra, ch);
assert(ret != -1);
return extra;
} else if (ch == '\n') {
parser_fatal(p, "Unclosed extra preamble field");
break;
} else {
ret = str_append_ch(extra, ch);
assert(ret != -1);
}
}
str_free(extra);
return NULL;
}
static void parse_preamble(struct parser *p) {
struct str *name = str_create();
int ex = 0;
struct str *extras[2] = { NULL };
struct str *section = NULL;
uint32_t ch;
time_t date_time;
char date[256];
char *source_date_epoch = getenv("SOURCE_DATE_EPOCH");
if (source_date_epoch != NULL) {
unsigned long long epoch;
char *endptr;
errno = 0;
epoch = strtoull(source_date_epoch, &endptr, 10);
if ((errno == ERANGE && (epoch == ULLONG_MAX || epoch == 0))
|| (errno != 0 && epoch == 0)) {
fprintf(stderr, "$SOURCE_DATE_EPOCH: strtoull: %s\n",
strerror(errno));
exit(EXIT_FAILURE);
}
if (endptr == source_date_epoch) {
fprintf(stderr, "$SOURCE_DATE_EPOCH: No digits were found: %s\n",
endptr);
exit(EXIT_FAILURE);
}
if (*endptr != '\0') {
fprintf(stderr, "$SOURCE_DATE_EPOCH: Trailing garbage: %s\n",
endptr);
exit(EXIT_FAILURE);
}
if (epoch > ULLONG_MAX) {
fprintf(stderr, "$SOURCE_DATE_EPOCH: value must be smaller than or "
"equal to %llu but was found to be: %llu \n",
ULLONG_MAX, epoch);
exit(EXIT_FAILURE);
}
date_time = epoch;
} else {
date_time = time(NULL);
}
struct tm *date_tm = gmtime(&date_time);
strftime(date, sizeof(date), "%F", date_tm);
while ((ch = parser_getch(p)) != UTF8_INVALID) {
if ((ch < 0x80 && isalnum((unsigned char)ch))
|| ch == '_' || ch == '-' || ch == '.') {
int ret = str_append_ch(name, ch);
assert(ret != -1);
} else if (ch == '(') {
section = parse_section(p);
} else if (ch == '"') {
if (ex == 2) {
parser_fatal(p, "Too many extra preamble fields");
}
extras[ex++] = parse_extra(p);
} else if (ch == '\n') {
if (name->len == 0) {
parser_fatal(p, "Expected preamble");
}
if (section == NULL) {
parser_fatal(p, "Expected manual section");
}
char *ex2 = extras[0] != NULL ? extras[0]->str : NULL;
char *ex3 = extras[1] != NULL ? extras[1]->str : NULL;
fprintf(p->output, ".TH \"%s\" \"%s\" \"%s\"", name->str, section->str, date);
/* ex2 and ex3 are already double-quoted */
if (ex2) {
fprintf(p->output, " %s", ex2);
}
if (ex3) {
fprintf(p->output, " %s", ex3);
}
fprintf(p->output, "\n");
break;
} else if (section == NULL) {
parser_fatal(p, "Name characters must be A-Z, a-z, 0-9, `-`, `_`, or `.`");
}
}
str_free(name);
for (int i = 0; i < 2; ++i) {
if (extras[i] != NULL) {
str_free(extras[i]);
}
}
}
static void parse_format(struct parser *p, enum formatting fmt) {
char formats[FORMAT_LAST] = {
[FORMAT_BOLD] = 'B',
[FORMAT_UNDERLINE] = 'I',
};
char error[512];
if (p->flags) {
if ((p->flags & ~fmt)) {
snprintf(error, sizeof(error), "Cannot nest inline formatting "
"(began with %c at %d:%d)",
p->flags == FORMAT_BOLD ? '*' : '_',
p->fmt_line, p->fmt_col);
parser_fatal(p, error);
}
fprintf(p->output, "\\fR");
} else {
fprintf(p->output, "\\f%c", formats[fmt]);
p->fmt_line = p->line;
p->fmt_col = p->col;
}
p->flags ^= fmt;
}
static bool parse_linebreak(struct parser *p) {
uint32_t plus = parser_getch(p);
if (plus != '+') {
fprintf(p->output, "+");
parser_pushch(p, plus);
return false;
}
uint32_t lf = parser_getch(p);
if (lf != '\n') {
fprintf(p->output, "+");
parser_pushch(p, lf);
parser_pushch(p, plus);
return false;
}
uint32_t ch = parser_getch(p);
if (ch == '\n') {
parser_fatal(
p, "Explicit line breaks cannot be followed by a blank line");
}
parser_pushch(p, ch);
fprintf(p->output, "\n.br\n");
return true;
}
static void parse_text(struct parser *p) {
uint32_t ch, next, last = ' ';
bool chomp_next_indent = false;
int i = 0;
while ((ch = parser_getch(p)) != UTF8_INVALID) {
// skip indentation if last was a linebreak
// and we need to chomp indentation
if (chomp_next_indent) {
if (ch == '\t' || ch == ' ') {
continue;
}
chomp_next_indent = false;
}
switch (ch) {
case '\\':
ch = parser_getch(p);
if (ch == UTF8_INVALID) {
parser_fatal(p, "Unexpected EOF");
} else if (ch == '\\') {
fprintf(p->output, "\\e");
} else if (ch == '`') {
fprintf(p->output, "\\`");
} else {
utf8_fputch(p->output, ch);
}
break;
case '*':
parse_format(p, FORMAT_BOLD);
break;
case '_':
next = parser_getch(p);
if (!isalnum((unsigned char)last) || (
(p->flags & FORMAT_UNDERLINE) &&
!isalnum((unsigned char)next))) {
parse_format(p, FORMAT_UNDERLINE);
} else {
utf8_fputch(p->output, ch);
}
if (next == UTF8_INVALID) {
return;
}
parser_pushch(p, next);
break;
case '+':
if (parse_linebreak(p)) {
last = '\n';
chomp_next_indent = true;
}
break;
case '\n':
utf8_fputch(p->output, ch);
return;
case '.':
if (!i) {
// Escape . if it's the first character
fprintf(p->output, "\\&.\\&");
break;
}
/* fallthrough */
case '\'':
if (!i) {
// Escape ' if it's the first character
fprintf(p->output, "\\&'\\&");
break;
}
/* fallthrough */
case '!':
case '?':
last = ch;
utf8_fputch(p->output, ch);
// Suppress sentence spacing
fprintf(p->output, "\\&");
break;
case '~':
// Escape ~ to not render it with U+02DC
fprintf(p->output, "\\(ti");
break;
case '^':
// Escape ^ to not render it with U+02C6
fprintf(p->output, "\\(ha");
break;
default:
last = ch;
utf8_fputch(p->output, ch);
break;
}
++i;
}
}
static void parse_heading(struct parser *p) {
uint32_t ch;
int level = 1;
while ((ch = parser_getch(p)) != UTF8_INVALID) {
if (ch == '#') {
++level;
} else if (ch == ' ') {
break;
} else {
parser_fatal(p, "Invalid start of heading (probably needs a space)");
}
}
switch (level) {
case 1:
fprintf(p->output, ".SH ");
break;
case 2:
fprintf(p->output, ".SS ");
break;
default:
parser_fatal(p, "Only headings up to two levels deep are permitted");
break;
}
while ((ch = parser_getch(p)) != UTF8_INVALID) {
utf8_fputch(p->output, ch);
if (ch == '\n') {
break;
}
}
}
static int parse_indent(struct parser *p, int *indent, bool write) {
int i = 0;
uint32_t ch;
while ((ch = parser_getch(p)) == '\t') {
++i;
}
parser_pushch(p, ch);
if ((ch == '\n' || ch == UTF8_INVALID) && *indent != 0) {
// Don't change indent when we encounter empty lines or EOF
return *indent;
}
if (write) {
if ((i - *indent) > 1) {
parser_fatal(p, "Indented by an amount greater than 1");
} else if (i < *indent) {
for (int j = *indent; i < j; --j) {
roff_macro(p, "RE", NULL);
}
} else if (i == *indent + 1) {
fprintf(p->output, ".RS 4\n");
}
}
*indent = i;
return i;
}
static void list_header(struct parser *p, int *num) {
if (*num == -1) {
fprintf(p->output, ".IP %s 4\n", "\\(bu");
} else {
fprintf(p->output, ".IP %d. 4\n", *num);
*num = *num + 1;
}
}
static void parse_list(struct parser *p, int *indent, int num) {
uint32_t ch;
if ((ch = parser_getch(p)) != ' ') {
parser_fatal(p, "Expected space before start of list entry");
}
fprintf(p->output, ".PD 0\n");
list_header(p, &num);
parse_text(p);
do {
parse_indent(p, indent, true);
if ((ch = parser_getch(p)) == UTF8_INVALID) {
break;
}
switch (ch) {
case ' ':
if ((ch = parser_getch(p)) != ' ') {
parser_fatal(p, "Expected two spaces for list entry continuation");
}
parse_text(p);
break;
case '-':
case '.':
if ((ch = parser_getch(p)) != ' ') {
parser_fatal(p, "Expected space before start of list entry");
}
list_header(p, &num);
parse_text(p);
break;
default:
roff_macro(p, "PD", NULL);
parser_pushch(p, ch);
return;
}
} while (ch != UTF8_INVALID);
}
static void parse_literal(struct parser *p, int *indent) {
uint32_t ch;
if ((ch = parser_getch(p)) != '`' ||
(ch = parser_getch(p)) != '`' ||
(ch = parser_getch(p)) != '\n') {
parser_fatal(p, "Expected ``` and a newline to begin literal block");
}
int stops = 0;
roff_macro(p, "nf", NULL);
fprintf(p->output, ".RS 4\n");
bool check_indent = true;
do {
if (check_indent) {
int _indent = *indent;
parse_indent(p, &_indent, false);
if (_indent < *indent) {
parser_fatal(p, "Cannot deindent in literal block");
}
while (_indent > *indent) {
--_indent;
fprintf(p->output, "\t");
}
check_indent = false;
}
if ((ch = parser_getch(p)) == UTF8_INVALID) {
break;
}
if (ch == '`') {
if (++stops == 3) {
if ((ch = parser_getch(p)) != '\n') {
parser_fatal(p, "Expected literal block to end with newline");
}
roff_macro(p, "fi", NULL);
roff_macro(p, "RE", NULL);
return;
}
} else {
while (stops != 0) {
fputc('`', p->output);
--stops;
}
switch (ch) {
case '.':
fprintf(p->output, "\\&.");
break;
case '\'':
fprintf(p->output, "\\&'");
break;
case '\\':
ch = parser_getch(p);
if (ch == UTF8_INVALID) {
parser_fatal(p, "Unexpected EOF");
} else if (ch == '\\') {
fprintf(p->output, "\\\\");
} else {
utf8_fputch(p->output, ch);
}
break;
case '\n':
check_indent = true;
/* fallthrough */
default:
utf8_fputch(p->output, ch);
break;
}
}
} while (ch != UTF8_INVALID);
}
enum table_align {
ALIGN_LEFT,
ALIGN_CENTER,
ALIGN_RIGHT,
ALIGN_LEFT_EXPAND,
ALIGN_CENTER_EXPAND,
ALIGN_RIGHT_EXPAND,
};
struct table_row {
struct table_cell *cell;
struct table_row *next;
};
struct table_cell {
enum table_align align;
struct str *contents;
struct table_cell *next;
};
static void parse_table(struct parser *p, uint32_t style) {
struct table_row *table = NULL;
struct table_row *currow = NULL, *prevrow = NULL;
struct table_cell *curcell = NULL;
int column = 0;
int numcolumns = -1;
uint32_t ch;
parser_pushch(p, '|');
do {
if ((ch = parser_getch(p)) == UTF8_INVALID) {
break;
}
switch (ch) {
case '\n':
goto commit_table;
case '|':
prevrow = currow;
currow = xcalloc(1, sizeof(struct table_row));
if (prevrow) {
if (column != numcolumns && numcolumns != -1) {
parser_fatal(p, "Each row must have the "
"same number of columns");
}
numcolumns = column;
column = 0;
prevrow->next = currow;
}
curcell = xcalloc(1, sizeof(struct table_cell));
currow->cell = curcell;
if (!table) {
table = currow;
}
break;
case ':':
if (!currow) {
parser_fatal(p, "Cannot start a column without "
"starting a row first");
} else {
struct table_cell *prev = curcell;
curcell = xcalloc(1, sizeof(struct table_cell));
if (prev) {
prev->next = curcell;
}
++column;
}
break;
case ' ':
goto continue_cell;
default:
parser_fatal(p, "Expected either '|' or ':'");
break;
}
if ((ch = parser_getch(p)) == UTF8_INVALID) {
break;
}
switch (ch) {
case '[':
curcell->align = ALIGN_LEFT;
break;
case '-':
curcell->align = ALIGN_CENTER;
break;
case ']':
curcell->align = ALIGN_RIGHT;
break;
case '<':
curcell->align = ALIGN_LEFT_EXPAND;
break;
case '=':
curcell->align = ALIGN_CENTER_EXPAND;
break;
case '>':
curcell->align = ALIGN_RIGHT_EXPAND;
break;
case ' ':
if (prevrow) {
struct table_cell *pcell = prevrow->cell;
for (int i = 0; i <= column && pcell; ++i, pcell = pcell->next) {
if (i == column) {
curcell->align = pcell->align;
break;
}
}
} else {
parser_fatal(p, "No previous row to infer alignment from");
}
break;
default:
parser_fatal(p, "Expected one of '[', '-', ']', or ' '");
break;
}
curcell->contents = str_create();
continue_cell:
switch (ch = parser_getch(p)) {
case ' ':
// Read out remainder of the text
while ((ch = parser_getch(p)) != UTF8_INVALID) {
switch (ch) {
case '\n':
goto commit_cell;
default:;
int ret = str_append_ch(curcell->contents, ch);
assert(ret != -1);
break;
}
}
break;
case '\n':
goto commit_cell;
default:
parser_fatal(p, "Expected ' ' or a newline");
break;
}
commit_cell:
if (strstr(curcell->contents->str, "T{")
|| strstr(curcell->contents->str, "T}")) {
parser_fatal(p, "Cells cannot contain T{ or T} "
"due to roff limitations");
}
} while (ch != UTF8_INVALID);
commit_table:
if (ch == UTF8_INVALID) {
return;
}
roff_macro(p, "TS", NULL);
switch (style) {
case '[':
fprintf(p->output, "allbox;");
break;
case ']':
fprintf(p->output, "box;");
break;
}
// Print alignments first
currow = table;
while (currow) {
curcell = currow->cell;
while (curcell) {
char *align = "";
switch (curcell->align) {
case ALIGN_LEFT:
align = "l";
break;
case ALIGN_CENTER:
align = "c";
break;
case ALIGN_RIGHT:
align = "r";
break;
case ALIGN_LEFT_EXPAND:
align = "lx";
break;
case ALIGN_CENTER_EXPAND:
align = "cx";
break;
case ALIGN_RIGHT_EXPAND:
align = "rx";
break;
}
fprintf(p->output, "%s%s", align, curcell->next ? " " : "");
curcell = curcell->next;
}
fprintf(p->output, "%s\n", currow->next ? "" : ".");
currow = currow->next;
}
// Then contents
currow = table;
while (currow) {
curcell = currow->cell;
fprintf(p->output, "T{\n");
while (curcell) {
parser_pushstr(p, curcell->contents->str);
parse_text(p);
if (curcell->next) {
fprintf(p->output, "\nT}\tT{\n");
} else {
fprintf(p->output, "\nT}");
}
struct table_cell *prev = curcell;
curcell = curcell->next;
str_free(prev->contents);
free(prev);
}
fprintf(p->output, "\n");
struct table_row *prev = currow;
currow = currow->next;
free(prev);
}
roff_macro(p, "TE", NULL);
fprintf(p->output, ".sp 1\n");
}
static void parse_document(struct parser *p) {
uint32_t ch;
int indent = 0;
do {
parse_indent(p, &indent, true);
if ((ch = parser_getch(p)) == UTF8_INVALID) {
break;
}
switch (ch) {
case ';':
if ((ch = parser_getch(p)) != ' ') {
parser_fatal(p, "Expected space after ; to begin comment");
}
do {
ch = parser_getch(p);
} while (ch != UTF8_INVALID && ch != '\n');
break;
case '#':
if (indent != 0) {
parser_pushch(p, ch);
parse_text(p);
break;
}
parse_heading(p);
break;
case '-':
parse_list(p, &indent, -1);
break;
case '.':
if ((ch = parser_getch(p)) == ' ') {
parser_pushch(p, ch);
parse_list(p, &indent, 1);
} else {
parser_pushch(p, ch);
parse_text(p);
}
break;
case '`':
parse_literal(p, &indent);
break;
case '[':
case '|':
case ']':
if (indent != 0) {
parser_fatal(p, "Tables cannot be indented");
}
parse_table(p, ch);
break;
case ' ':
parser_fatal(p, "Tabs are required for indentation");
break;
case '\n':
if (p->flags) {
char error[512];
snprintf(error, sizeof(error), "Expected %c before starting "
"new paragraph (began with %c at %d:%d)",
p->flags == FORMAT_BOLD ? '*' : '_',
p->flags == FORMAT_BOLD ? '*' : '_',
p->fmt_line, p->fmt_col);
parser_fatal(p, error);
}
roff_macro(p, "PP", NULL);
break;
default:
parser_pushch(p, ch);
parse_text(p);
break;
}
} while (ch != UTF8_INVALID);
}
static void output_scdoc_preamble(struct parser *p) {
fprintf(p->output, ".\\\" Generated by scdoc " VERSION "\n");
fprintf(p->output, ".\\\" Complete documentation for this program is not "
"available as a GNU info page\n");
// Fix weird quotation marks
// http://bugs.debian.org/507673
// http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
fprintf(p->output, ".ie \\n(.g .ds Aq \\(aq\n");
fprintf(p->output, ".el .ds Aq '\n");
// Disable hyphenation:
roff_macro(p, "nh", NULL);
// Disable justification:
roff_macro(p, "ad l", NULL);
fprintf(p->output, ".\\\" Begin generated content:\n");
}
int main(int argc, char **argv) {
if (argc == 2 && strcmp(argv[1], "-v") == 0) {
printf("scdoc " VERSION "\n");
return 0;
} else if (argc > 1) {
fprintf(stderr, "Usage: scdoc < input.scd > output.roff\n");
return 1;
}
struct parser p = {
.input = stdin,
.output = stdout,
.line = 1,
.col = 1
};
output_scdoc_preamble(&p);
parse_preamble(&p);
parse_document(&p);
return 0;
}