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-rw-r--r--FL/Fl_Text_Buffer.H33
-rw-r--r--src/Fl_Text_Buffer.cxx177
-rw-r--r--test/editor.cxx2
3 files changed, 194 insertions, 18 deletions
diff --git a/FL/Fl_Text_Buffer.H b/FL/Fl_Text_Buffer.H
index 3cc65da8d..1aaa4e792 100644
--- a/FL/Fl_Text_Buffer.H
+++ b/FL/Fl_Text_Buffer.H
@@ -300,20 +300,22 @@ public:
non-zero on error (strerror() contains reason). 1 indicates open
for read failed (no data loaded). 2 indicates error occurred
while reading data (data was partially loaded).
+ File can be UTF-8 or CP1252-encoded.
+ If the input file is not UTF-8-encoded, the Fl_Text_Buffer widget will contain
+ UTF-8-recoded data. By default, the message Fl_Text_Buffer::file_encoding_warning_message
+ will warn the user about this.
+ \see input_file_was_reencoded and transcoding_warning_action.
*/
int insertfile(const char *file, int pos, int buflen = 128*1024);
/**
- Appends the named file to the end of the buffer. Returns 0 on
- success, non-zero on error (strerror() contains reason). 1 indicates
- open for read failed (no data loaded). 2 indicates error occurred
- while reading data (data was partially loaded).
+ Appends the named file to the end of the buffer. See also insertfile().
*/
int appendfile(const char *file, int buflen = 128*1024)
{ return insertfile(file, length(), buflen); }
/**
- Loads a text file into the buffer
+ Loads a text file into the buffer. See also insertfile().
*/
int loadfile(const char *file, int buflen = 128*1024)
{ select(0, length()); remove_selection(); return appendfile(file, buflen); }
@@ -669,6 +671,27 @@ public:
*/
int utf8_align(int) const;
+ /**
+ \brief true iff the loaded file has been re-encoded to UTF-8
+ */
+ int input_file_was_reencoded;
+
+ /** This message may be displayed using the fl_alert() function when a file
+ which was not UTF-8 encoded is input.
+ */
+ static const char* file_encoding_warning_message;
+
+ /**
+ \brief Pointer to a function called after reading a non UTF-8 encoded file.
+
+ This function is called after reading a file if the file content
+ was re-encoded to UTF-8. Its default implementation calls fl_alert()
+ with the text of \ref file_encoding_warning_message. No warning message is
+ displayed if this pointer is set to NULL. Use \ref input_file_was_reencoded
+ to be programmatically informed if file input required re-encoding to UTF-8.
+ */
+ void (*transcoding_warning_action)(Fl_Text_Buffer*);
+
protected:
/**
diff --git a/src/Fl_Text_Buffer.cxx b/src/Fl_Text_Buffer.cxx
index abafcc29b..f31bd13d1 100644
--- a/src/Fl_Text_Buffer.cxx
+++ b/src/Fl_Text_Buffer.cxx
@@ -32,6 +32,7 @@
#include <ctype.h>
#include <FL/Fl.H>
#include <FL/Fl_Text_Buffer.H>
+#include <FL/fl_ask.H>
/*
@@ -102,6 +103,10 @@ static void undobuffersize(int n)
}
}
+static void def_transcoding_warning_action(Fl_Text_Buffer *text)
+{
+ fl_alert(text->file_encoding_warning_message);
+}
/*
Initialize all variables.
@@ -128,6 +133,8 @@ Fl_Text_Buffer::Fl_Text_Buffer(int requestedSize, int preferredGapSize)
mPredeleteCbArgs = NULL;
mCursorPosHint = 0;
mCanUndo = 1;
+ input_file_was_reencoded = 0;
+ transcoding_warning_action = def_transcoding_warning_action;
}
@@ -1513,30 +1520,174 @@ int Fl_Text_Buffer::findchar_backward(int startPos, unsigned int searchChar,
return 0;
}
+//#define FIXED_LENGTH_ENCODING // shows how to process any fixed-length encoding
+#ifdef FIXED_LENGTH_ENCODING
+
+// returns the UCS equivalent of *p in CP1252 and advances p by 1
+unsigned cp1252toucs(char* &p)
+{
+ // Codes 0x80..0x9f from the Microsoft CP1252 character set, translated
+ // to Unicode
+ static unsigned cp1252[32] = {
+ 0x20ac, 0x0081, 0x201a, 0x0192, 0x201e, 0x2026, 0x2020, 0x2021,
+ 0x02c6, 0x2030, 0x0160, 0x2039, 0x0152, 0x008d, 0x017d, 0x008f,
+ 0x0090, 0x2018, 0x2019, 0x201c, 0x201d, 0x2022, 0x2013, 0x2014,
+ 0x02dc, 0x2122, 0x0161, 0x203a, 0x0153, 0x009d, 0x017e, 0x0178
+ };
+ unsigned char uc = *(unsigned char*)p;
+ p++;
+ return (uc < 0x80 || uc >= 0xa0 ? uc : cp1252[uc - 0x80]);
+}
+
+// returns the UCS equivalent of *p in UTF-16 and advances p by 2
+unsigned utf16toucs(char* &p)
+{
+ union {
+#if WORDS_BIGENDIAN
+ struct { unsigned char a, b;} chars;
+#else
+ struct { unsigned char b, a;} chars;
+#endif
+ U16 short_val;
+ } u;
+ u.chars.a = *(unsigned char*)p++;
+ u.chars.b = *(unsigned char*)p++;
+ return u.short_val;
+}
+
+// filter that produces, from an input stream fed by reading from fp,
+// a UTF-8-encoded output stream written in buffer.
+// Input can be any fixed-length (e.g., 8-bit, UTF-16) encoding.
+// Output is true UTF-8.
+// p_trf points to a function that transforms encoded byte(s) into UCS
+// and that increases the pointer by the adequate quantity
+static int fixed_length_input_filter(char *buffer, int buflen,
+ char *line, int sline, char* &endline,
+ unsigned (*p_trf)(char* &),
+ FILE *fp)
+{
+ char *p, *q, multibyte[5];
+ int lq, r, offset;
+ p = endline = line;
+ q = buffer;
+ while (q < buffer + buflen) {
+ if (p >= endline) {
+ r = fread(line, 1, sline, fp);
+ endline = line + r;
+ if (r == 0) return q - buffer;
+ p = line;
+ }
+ if (q + 4 /*max width of utf-8 char*/ > buffer + buflen) {
+ memmove(line, p, endline - p);
+ endline -= (p - line);
+ return q - buffer;
+ }
+ lq = fl_utf8encode( p_trf(p), multibyte );
+ memcpy(q, multibyte, lq);
+ q += lq;
+ }
+ memmove(line, p, endline - p);
+ endline -= (p - line);
+ return q - buffer;
+}
+#endif // FIXED_LENGTH_ENCODING
+
+/*
+ filter that produces, from an input stream fed by reading from fp,
+ a UTF-8-encoded output stream written in buffer.
+ Input can be UTF-8. If it is not, it is decoded with CP1252.
+ Output is UTF-8.
+ *input_was_changed is set to true if the input was not strict UTF-8 so output
+ differs from input.
+ */
+static int utf8_input_filter(char *buffer, int buflen, char *line, int sline, char* &endline,
+ FILE *fp, int *input_was_changed)
+{
+ char *p, *q, multibyte[5];
+ int l, lp, lq, r;
+ unsigned u;
+ p = endline = line;
+ q = buffer;
+ while (q < buffer + buflen) {
+ if (p >= endline) {
+ r = fread(line, 1, sline, fp);
+ endline = line + r;
+ if (r == 0) return q - buffer;
+ p = line;
+ }
+ l = fl_utf8len1(*p);
+ if (p + l > endline) {
+ memmove(line, p, endline - p);
+ endline -= (p - line);
+ r = fread(endline, 1, sline - (endline - line), fp);
+ endline += r;
+ p = line;
+ if (endline - line < l) break;
+ }
+ while ( l > 0) {
+ u = fl_utf8decode(p, p+l, &lp);
+ lq = fl_utf8encode(u, multibyte);
+ if (lp != l || lq != l) *input_was_changed = true;
+ if (q + lq > buffer + buflen) {
+ memmove(line, p, endline - p);
+ endline -= (p - line);
+ return q - buffer;
+ }
+ memcpy(q, multibyte, lq);
+ q += lq;
+ p += lp;
+ l -= lp;
+ }
+ }
+ memmove(line, p, endline - p);
+ endline -= (p - line);
+ return q - buffer;
+}
+
+const char *Fl_Text_Buffer::file_encoding_warning_message =
+"Displayed text contains the UTF-8 re-encoding\n"
+"of the input file which was not UTF-8 encoded.\n"
+"Some changes may have occurred.";
/*
Insert text from a file.
- Unicode safe. Input must be correct UTF-8!
+ Input file can be of various encodings according to what input fiter is used.
+ utf8_input_filter accepts UTF-8 or CP1252 as input encoding.
+ Output is always UTF-8.
*/
-int Fl_Text_Buffer::insertfile(const char *file, int pos, int /*buflen*/) {
+ int Fl_Text_Buffer::insertfile(const char *file, int pos, int buflen)
+{
FILE *fp;
if (!(fp = fl_fopen(file, "r")))
return 1;
- fseek(fp, 0, SEEK_END);
- size_t filesize = ftell(fp);
- fseek(fp, 0, SEEK_SET);
- if (!filesize) return 0;
- char *buffer = new char[filesize+1];
- // Note: If we read Windows text files in text mode, then Windows
- // strips the <CR>'s from the text. Hence, rsize < filesize !
- size_t rsize = fread(buffer, 1, filesize, fp);
- if (rsize > 0) {
- buffer[rsize] = (char) 0;
+ char *buffer = new char[buflen + 1];
+ char *endline, line[100];
+ int l;
+ input_file_was_reencoded = false;
+ endline = line;
+ while (true) {
+#ifdef FIXED_LENGTH_ENCODING
+ // example of 16-bit encoding: UTF-16
+ l = fixed_length_input_filter(buffer, buflen,
+ line, sizeof(line), endline,
+ utf16toucs, // use cp1252toucs to read CP1252-encoded files
+ fp);
+ input_file_was_reencoded = true;
+#else
+ l = utf8_input_filter(buffer, buflen, line, sizeof(line), endline,
+ fp, &input_file_was_reencoded);
+#endif
+ if (l == 0) break;
+ buffer[l] = 0;
insert(pos, buffer);
- }
+ pos += l;
+ }
int e = ferror(fp) ? 2 : 0;
fclose(fp);
delete[]buffer;
+ if ( (!e) && input_file_was_reencoded && transcoding_warning_action) {
+ transcoding_warning_action(this);
+ }
return e;
}
diff --git a/test/editor.cxx b/test/editor.cxx
index 6a920edae..92742ad48 100644
--- a/test/editor.cxx
+++ b/test/editor.cxx
@@ -492,6 +492,7 @@ void load_file(const char *newfile, int ipos) {
int r;
if (!insert) r = textbuf->loadfile(newfile);
else r = textbuf->insertfile(newfile, ipos);
+ changed = changed || textbuf->input_file_was_reencoded;
if (r)
fl_alert("Error reading from file \'%s\':\n%s.", newfile, strerror(errno));
else
@@ -795,6 +796,7 @@ Fl_Window* new_view() {
int main(int argc, char **argv) {
textbuf = new Fl_Text_Buffer;
+//textbuf->transcoding_warning_action = NULL;
style_init();
Fl_Window* window = new_view();
generated by cgit v1.2.3 (git 2.25.1) at 2026-02-08 10:17:45 +0000