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pdf-operators: word wrap latin text strings

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This commit is contained in:
Adrian Johnson 2010-10-02 12:34:42 +09:30
parent 165a14b564
commit cd74f5edab
1 changed files with 65 additions and 8 deletions
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73
src/cairo-pdf-operators.c
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@ -169,8 +169,10 @@ typedef struct _word_wrap_stream {
int max_column;
int column;
cairo_bool_t last_write_was_space;
cairo_bool_t in_string;
cairo_bool_t in_hexstring;
cairo_bool_t empty_hexstring;
cairo_bool_t empty_string;
cairo_bool_t in_escape;
} word_wrap_stream_t;
static int
@ -179,7 +181,7 @@ _count_word_up_to (const unsigned char *s, int length)
int word = 0;
while (length--) {
if (! (_cairo_isspace (*s) || *s == '<')) {
if (! (_cairo_isspace (*s) || *s == '<' || *s == '(')) {
s++;
word++;
} else {
@ -213,6 +215,33 @@ _count_hexstring_up_to (const unsigned char *s, int length, int columns)
return word;
}
/* Count up to either the end of the string or the number of columns
* remaining.
*/
static int
_count_string_up_to (const unsigned char *s, int length, int columns, cairo_bool_t *in_escape)
{
int word = 0;
while (length--) {
if (*in_escape || *s != ')') {
word++;
if (!*in_escape && *s++ == '\\')
*in_escape = TRUE;
else
*in_escape = FALSE;
} else {
return word;
}
columns--;
if (columns < 0 && word > 0)
return word;
}
return word;
}
static cairo_status_t
_word_wrap_stream_write (cairo_output_stream_t *base,
const unsigned char *data,
@ -225,7 +254,7 @@ _word_wrap_stream_write (cairo_output_stream_t *base,
while (length) {
if (*data == '<') {
stream->in_hexstring = TRUE;
stream->empty_hexstring = TRUE;
stream->empty_string = TRUE;
stream->last_write_was_space = FALSE;
data++;
length--;
@ -238,7 +267,27 @@ _word_wrap_stream_write (cairo_output_stream_t *base,
length--;
_cairo_output_stream_printf (stream->output, ">");
stream->column++;
} else if (_cairo_isspace (*data)) {
} else if (*data == '(') {
stream->in_string = TRUE;
stream->in_escape = FALSE;
stream->empty_string = TRUE;
stream->last_write_was_space = FALSE;
data++;
length--;
_cairo_output_stream_printf (stream->output, "(");
stream->column++;
} else if (*data == ')') {
stream->in_string = FALSE;
stream->last_write_was_space = FALSE;
data++;
length--;
_cairo_output_stream_printf (stream->output, ")");
stream->column++;
if (stream->column > stream->max_column) {
_cairo_output_stream_printf (stream->output, "\n");
stream->column = 0;
}
} else if (_cairo_isspace (*data) && !stream->in_string) {
newline = (*data == '\n' || *data == '\r');
if (! newline && stream->column >= stream->max_column) {
_cairo_output_stream_printf (stream->output, "\n");
@ -257,6 +306,9 @@ _word_wrap_stream_write (cairo_output_stream_t *base,
if (stream->in_hexstring) {
word = _count_hexstring_up_to (data, length,
MAX (stream->max_column - stream->column, 0));
} else if (stream->in_string) {
word = _count_string_up_to (data, length,
MAX (stream->max_column - stream->column, 0), &stream->in_escape);
} else {
word = _count_word_up_to (data, length);
}
@ -264,8 +316,11 @@ _word_wrap_stream_write (cairo_output_stream_t *base,
* string word from a previous call to write. */
if (stream->column + word >= stream->max_column) {
if (stream->last_write_was_space ||
(stream->in_hexstring && !stream->empty_hexstring))
(stream->in_hexstring && !stream->empty_string) ||
(stream->in_string && !stream->empty_string && !stream->in_escape))
{
if (stream->in_string)
_cairo_output_stream_printf (stream->output, "\\");
_cairo_output_stream_printf (stream->output, "\n");
stream->column = 0;
}
@ -275,8 +330,8 @@ _word_wrap_stream_write (cairo_output_stream_t *base,
length -= word;
stream->column += word;
stream->last_write_was_space = FALSE;
if (stream->in_hexstring)
stream->empty_hexstring = FALSE;
if (stream->in_hexstring || stream->in_string)
stream->empty_string = FALSE;
}
}
@ -314,7 +369,9 @@ _word_wrap_stream_create (cairo_output_stream_t *output, int max_column)
stream->column = 0;
stream->last_write_was_space = FALSE;
stream->in_hexstring = FALSE;
stream->empty_hexstring = TRUE;
stream->in_string = FALSE;
stream->in_escape = FALSE;
stream->empty_string = TRUE;
return &stream->base;
}