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/*
* Routines to wrap lines and indent them.
*
* Copyright © 1998-2016 World Wide Web Consortium
* See http://www.w3.org/Consortium/Legal/copyright-software
*
* To do: count characters, not bytes
*
* Bert Bos
* Created 10 May 1998
* $Id: textwrap.c,v 1.32 2017/11/24 10:14:49 bbos Exp $
*/
#include "config.h"
#include <stdio.h>
#include <ctype.h>
#include <assert.h>
#if STDC_HEADERS
# include <string.h>
#else
# ifndef HAVE_STRCHR
# define strchr index
# define strrchr rindex
# endif
#endif
#include <stdlib.h>
#include <stdbool.h>
#include "export.h"
#include "types.e"
#include "errexit.e"
#include "heap.e"
/* To do: XML 1.1 allows , so the following isn't safe anymore */
#define NBSP 1 /* Marks non-break-space */
#define BREAKOP 2 /* '\002' marks a line break opportunity */
static unsigned char *buf = NULL;
static int buflen = 0; /* Size of buf */
static int len = 0; /* Length of buf */
static int bufchars = 0; /* Ditto in chars, not bytes */
static int linelen = 0; /* Length of printed line */
static int level = 0; /* Indentation level */
static int indent = 2; /* # of spaces per indent */
static int maxlinelen = 72; /* Desired line length */
static unsigned char prev = NBSP; /* Previously added char */
/* set_indent -- set the amount of indent per level */
EXPORT void set_indent(int n) {indent = n;}
/* set_linelen -- set the maximum length of a line */
EXPORT void set_linelen(int n) {maxlinelen = n;}
/* flush -- print word in buf */
EXPORT void flush()
{
int i, j, k;
assert(len <= buflen);
while (len != 0 && linelen + bufchars >= maxlinelen) { /* Need break */
/* Find last breakpoint i before maxlinelen, or first after it */
for (i = -1, j = 0, k = 0; j < len && (k < maxlinelen || i == -1); j++)
if (buf[j] == ' ') {i = j; k++;}
else if (buf[j] == BREAKOP) i = j; /* Breakpoint but no character */
else if ((buf[j] & 0xC0) != 0x80) k++; /* Start of a UTF-8 sequence */
if (i < 0) break; /* No breakpoint */
assert(i >= 0); /* Found a breakpoint at i */
assert(buf[i] == ' ' || buf[i]==BREAKOP);
/* Print up to breakpoint (removing non-break-space markers) */
for (j = 0; j < i; j++)
if (buf[j] != BREAKOP) {
putchar(buf[j] == NBSP ? ' ' : buf[j]);
if ((buf[j] & 0xC0) != 0x80) bufchars--;
}
putchar('\n'); /* Break line */
linelen = 0;
assert(level >= 0);
assert(len >= 0);
assert(i <= len);
i++; /* Skip the breakpoint */
len -= i;
if (len != 0) { /* If anything left, insert the indent */
memmove(buf + level * indent, buf + i, len);
for (j = 0; j < level * indent; j++) buf[j] = NBSP; /* Indent */
len += level * indent;
bufchars += level * indent;
}
}
/* Print rest, if any (removing non-break-space markers) */
/* First remove spaces at end of line */
while (len > 0 && buf[len-1] == ' ') {len--; bufchars--;}
for (j = 0; j < len; j++)
if (buf[j] == BREAKOP) /* skip */;
else if (buf[j] == '\n' || buf[j] == '\r') {putchar(buf[j]); linelen = 0;}
else if (buf[j] == NBSP) {putchar(' '); linelen++;}
else if ((buf[j] & 0xC0) != 0x80) {putchar(buf[j]); linelen++;}
else putchar(buf[j]);
bufchars = 0;
len = 0;
}
/* outc -- add one character to output buffer */
EXPORT void outc(char c, bool preformatted)
{
if (c == '\n' && !preformatted) c = ' '; /* Newline is just a space */
if (c == '\r' && !preformatted) c = ' '; /* CR is just a space */
if (c == '\t' && !preformatted) c = ' '; /* Tab is just a space */
if (c == '\f' && !preformatted) c = ' '; /* Formfeed is just a space */
if (c == ' ' && preformatted) c = NBSP; /* Non-break-space marker */
if (c == ' ' && prev == ' ') return; /* Don't add another space */
if ((c == ' ' || c == BREAKOP) && linelen + bufchars >= maxlinelen) flush();
if (c == '\n' || c == '\r' || c == '\f') flush(); /* Empty the buf */
if (c == ' ' && linelen + len == 0) return; /* No ins at BOL */
while (level * indent >= buflen) {buflen += 1024; renewarray(buf, buflen);}
if (linelen + len == 0 && !preformatted)
while (len < level * indent) {buf[len++] = NBSP; bufchars++;}
if (c == ' ' && len && buf[len-1] == ' ') return; /* Skip multiple spaces */
while (len >= buflen) {buflen += 1024; renewarray(buf, buflen);}
if ((c & 0xC0) != 0x80) bufchars++; /* Character */
buf[len++] = c; /* Finally, insert c */
prev = c; /* Remember for next round */
}
/* out -- add text to current output line, print line if getting too long */
EXPORT void out(string s, bool preformatted)
{
if (s) for (; *s; s++) outc(*s, preformatted);
}
/* outn -- add n chars to current output, print line if getting too long */
EXPORT void outn(string s, size_t n, bool preformatted)
{
size_t i;
for (i = 0; i < n; i++) outc(s[i], preformatted);
}
/* outln -- add string to output buffer, followed by '\n' */
EXPORT void outln(char *s, bool preformatted)
{
out(s, preformatted);
flush();
assert(len == 0);
assert(bufchars == 0);
putchar('\n');
linelen = 0;
}
/* outbreak -- conditional new line; make sure next text starts on new line */
EXPORT void outbreak(void)
{
flush();
assert(len == 0);
assert(bufchars == 0);
if (linelen != 0) {
putchar('\n');
linelen = 0;
}
}
/* outbreakpoint -- mark a possible line break point */
EXPORT void outbreakpoint(void)
{
outc(BREAKOP, false);
}
/* inc_indent -- increase indentation level by 1 */
EXPORT void inc_indent(void)
{
flush();
level++;
}
/* dec_indent -- decrease indentation level by 1 */
EXPORT void dec_indent(void)
{
flush();
level--;
}
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