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3660343dc7
lyx_mirror/src/vspace.C
Lars Gullik Bjønnes 3660343dc7 a couple of name changes and new functionality in lyxvc and vc-backend 
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@302 a592a061-630c-0410-9148-cb99ea01b6c8
1999-11-09 23:52:04 +00:00

596 lines
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C
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// -*- C++ -*-
/* This file is part of
* ======================================================
*
* LyX, The Document Processor
*
* Copyright 1995 Matthias Ettrich
* Copyright 1995-1999 The LyX Team.
*
* ======================================================*/
#include <config.h>
#ifdef __GNUG__
#pragma implementation "vspace.h"
#endif
#include "lyx_main.h"
#include "buffer.h"
#include "vspace.h"
#include "lyxrc.h"
#include "lyxtext.h"
#include <cstdio>
#include <cstring>
#include "BufferView.h"
#include "support/lstrings.h"
extern LyXRC * lyxrc;
extern BufferView *current_view;
/* length units
*/
static const int num_units = LyXLength::UNIT_NONE;
// I am not sure if "mu" should be possible to select (Lgb)
static char const * unit_name[num_units] = { "sp", "pt", "bp", "dd",
"mm", "pc", "cc", "cm",
"in", "ex", "em", "mu" };
LyXLength::UNIT unitFromString (string const & data)
{
int i=0;
while ((i<num_units) && (data != unit_name[i])) ++i;
return (LyXLength::UNIT)i;
}
/* The following static items form a simple scanner for
* length strings, used by isValid[Glue]Length. See comments there.
*/
static float number[4] = { 0, 0, 0, 0 };
static LyXLength::UNIT unit[4] = { LyXLength::UNIT_NONE,
LyXLength::UNIT_NONE,
LyXLength::UNIT_NONE,
LyXLength::UNIT_NONE };
//static int number_index, unit_index;
int number_index, unit_index;
static inline void lyx_advance (string & data, unsigned int n)
{
data.erase(0, n);
}
static inline bool isEndOfData (string const & data)
{
return frontStrip (data).empty();
}
static char nextToken (string & data)
{
data = frontStrip(data);
if (data.empty())
return '\0';
else if (data[0] == '+') {
lyx_advance (data, 1);
return '+';
}
else if (prefixIs(data, "plus")) {
lyx_advance (data, 4);
return '+';
}
else if (data[0] == '-') {
lyx_advance (data, 1);
return '-';
}
else if (prefixIs(data, "minus")) {
lyx_advance (data, 5);
return '-';
}
else {
string::size_type i;
// I really mean assignment ("=") below, not equality!
if ((i = data.find_last_of("0123456789.")) != string::npos) {
if (number_index > 3) return 'E'; // Error
string buffer = data.substr(0, i + 1);
if (sscanf (buffer.c_str(),
"%f", &number[number_index]) == 1) {
lyx_advance (data, i + 1);
++number_index;
return 'n';
} else
return 'E'; // Error
} else if ((i=data.find_last_of("abcdefghijklmnopqrstuvwxyz"))
!= string::npos) {
if (unit_index > 3) return 'E'; // Error
string buffer = data.substr(0, i + 1);
unit[unit_index] = unitFromString (buffer);
if (unit[unit_index] != LyXLength::UNIT_NONE) {
lyx_advance (data, i + 1);
++unit_index;
return 'u';
} else
return 'E'; // Error
} else
return 'E'; // Error
}
}
static struct {
char const * pattern;
int plus_val_index, minus_val_index,
plus_uni_index, minus_uni_index;
} table[] = { { "nu", 0, 0, 0, 0 },
{ "nu+nu", 2, 0, 2, 0 },
{ "nu+nu-nu", 2, 3, 2, 3 },
{ "nu+-nu", 2, 2, 2, 2 },
{ "nu-nu", 0, 2, 0, 2 },
{ "nu-nu+nu", 3, 2, 3, 2 },
{ "nu-+nu", 2, 2, 2, 2 },
{ "n+nu", 2, 0, 1, 0 },
{ "n+n-nu", 2, 3, 1, 1 },
{ "n+-nu", 2, 2, 1, 1 },
{ "n-nu", 0, 2, 0, 1 },
{ "n-n+nu", 3, 2, 1, 1 },
{ "n-+nu", 2, 2, 1, 1 },
{ "", 0, 0, 0, 0 } // sentinel, must be empty
};
bool isValidGlueLength (string const & data, LyXGlueLength * result)
{
// This parser is table-driven. First, it constructs a "pattern"
// that describes the sequence of tokens in "data". For example,
// "n-nu" means: number, minus sign, number, unit. As we go along,
// numbers and units are stored into static arrays. Then, "pattern"
// is searched in the "table". If it is found, the associated
// table entries tell us which number and unit should go where
// in the LyXLength structure. Example: if "data" has the "pattern"
// "nu+nu-nu", the associated table entries are "2, 3, 2, 3".
// That means, "plus_val" is the second number that was seen
// in the input, "minus_val" is the third number, and "plus_uni"
// and "minus_uni" are the second and third units, respectively.
// ("val" and "uni" are always the first items seen in "data".)
// This is the most elegant solution I could find -- a straight-
// forward approach leads to very long, tedious code that would be
// much harder to understand and maintain. (AS)
if (data.empty())
return true;
string buffer = frontStrip(data);
// To make isValidGlueLength recognize negative values as
// the first number this little hack is needed:
short val_sign = 1; // positive as default
switch(buffer[0]) {
case '-':
lyx_advance(buffer, 1);
val_sign = -1;
break;
case '+':
lyx_advance(buffer, 1);
// fall through
default:
// no action
break;
}
// end of hack
int pattern_index = 0, table_index = 0;
char pattern[20];
number_index = unit_index = 1; // entries at index 0 are sentinels
// construct "pattern" from "data"
while (!isEndOfData (buffer)) {
if (pattern_index > 20) return false;
pattern[pattern_index] = nextToken (buffer);
if (pattern[pattern_index] == 'E') return false;
++pattern_index;
}
pattern[pattern_index] = '\0';
// search "pattern" in "table"
table_index = 0;
while (compare(pattern, table[table_index].pattern)) {
++table_index;
if (!*table[table_index].pattern) return false;
}
// Get the values from the appropriate places. If an index
// is zero, the corresponding array value is zero or UNIT_NONE,
// so we needn't check this.
if (result) {
result->val = number[1] * val_sign;
result->uni = unit[1];
result->plus_val = number[table[table_index].plus_val_index];
result->minus_val = number[table[table_index].minus_val_index];
result->plus_uni = unit [table[table_index].plus_uni_index];
result->minus_uni = unit [table[table_index].minus_uni_index];
}
return true;
}
bool isValidLength(string const & data, LyXLength * result)
{
/// This is a trimmed down version of isValidGlueLength.
/// The parser may seem overkill for lengths without
/// glue, but since we already have it, using it is
/// easier than writing something from scratch.
string buffer = data;
int pattern_index = 0;
char pattern[3];
// To make isValidLength recognize negative values
// this little hack is needed:
short val_sign = 1; // positive as default
switch(buffer[0]) {
case '-':
lyx_advance(buffer, 1);
val_sign = -1;
break;
case '+':
lyx_advance(buffer, 1);
// fall through
default:
// no action
break;
}
// end of hack
number_index = unit_index = 1; // entries at index 0 are sentinels
// construct "pattern" from "data"
while (!isEndOfData (buffer)) {
if (pattern_index > 2) return false;
pattern[pattern_index] = nextToken (buffer);
if (pattern[pattern_index] == 'E') return false;
++pattern_index;
}
pattern[pattern_index] = '\0';
// only the most basic pattern is accepted here
if (compare(pattern, "nu") != 0) return false;
// It _was_ a correct length string.
// Store away the values we found.
if (result) {
result->val = number[1]*val_sign;
result->uni = unit[1];
}
return true;
}
/// LyXLength class
LyXLength::LyXLength(string const & data)
{
LyXLength tmp;
if (!isValidLength (data, &tmp))
return; // should raise an exception
else {
val = tmp.val;
uni = tmp.uni;
}
}
bool LyXLength::operator== (LyXLength const & other) const
{
return (val == other.val &&
uni == other.uni);
}
string LyXLength::asString() const
{
char buffer[20];
sprintf (buffer, "%g%s", val, unit_name[uni]);
return string (buffer);
}
/* LyXGlueLength class
*/
LyXGlueLength::LyXGlueLength (string const & data)
{
LyXGlueLength tmp(0.0, PT);
if (!isValidGlueLength (data, &tmp))
return; // should raise an exception
else {
val=tmp.val;
uni=tmp.uni;
plus_val =tmp.plus_val;
plus_uni =tmp.plus_uni;
minus_val=tmp.minus_val;
minus_uni=tmp.minus_uni;
}
}
bool LyXGlueLength::operator== (LyXGlueLength const & other) const
{
return (val == other.val &&
uni == other.uni &&
plus_val == other.plus_val &&
plus_uni == other.plus_uni &&
minus_val == other.minus_val &&
minus_uni == other.minus_uni);
}
string LyXGlueLength::asString() const
{
char buffer[20];
if (plus_val != 0.0)
if (minus_val != 0.0)
if ((uni == plus_uni) && (uni == minus_uni))
if (plus_val == minus_val)
sprintf (buffer, "%g+-%g%s",
val, plus_val, unit_name[uni]);
else
sprintf (buffer, "%g+%g-%g%s",
val, plus_val, minus_val,
unit_name[uni]);
else
if ((plus_uni == minus_uni) && (plus_val == minus_val))
sprintf (buffer, "%g%s+-%g%s",
val, unit_name[uni],
plus_val, unit_name[plus_uni]);
else
sprintf (buffer, "%g%s+%g%s-%g%s",
val, unit_name[uni],
plus_val, unit_name[plus_uni],
minus_val, unit_name[minus_uni]);
else
if (uni == plus_uni)
sprintf (buffer, "%g+%g%s",
val, plus_val, unit_name[uni]);
else
sprintf (buffer, "%g%s+%g%s",
val, unit_name[uni],
plus_val, unit_name[plus_uni]);
else
if (minus_val != 0.0)
if (uni == minus_uni)
sprintf (buffer, "%g-%g%s",
val, minus_val, unit_name[uni]);
else
sprintf (buffer, "%g%s-%g%s",
val, unit_name[uni],
minus_val, unit_name[minus_uni]);
else
sprintf (buffer, "%g%s", val, unit_name[uni]);
return string (buffer);
}
string LyXGlueLength::asLatexString() const
{
char buffer[40];
if (plus_val != 0.0)
if (minus_val != 0.0)
sprintf (buffer, "%g%s plus %g%s minus %g%s",
val, unit_name[uni],
plus_val, unit_name[plus_uni],
minus_val, unit_name[minus_uni]);
else
sprintf (buffer, "%g%s plus %g%s",
val, unit_name[uni],
plus_val, unit_name[plus_uni]);
else
if (minus_val != 0.0)
sprintf (buffer, "%g%s minus %g%s",
val, unit_name[uni],
minus_val, unit_name[minus_uni]);
else
sprintf (buffer, "%g%s",
val, unit_name[uni]);
return string (buffer);
}
/* VSpace class
*/
VSpace::VSpace (string const & data)
: kin (NONE), len (0.0, LyXLength::PT)
{
kp = false;
if (data.empty())
return;
float value;
string input = strip(data);
int length = input.length();
if (length > 1 && input[length-1] == '*') {
kp = true;
input.erase(length - 1);
}
if (prefixIs (input, "defskip")) kin = DEFSKIP;
else if (prefixIs (input, "smallskip")) kin = SMALLSKIP;
else if (prefixIs (input, "medskip")) kin = MEDSKIP;
else if (prefixIs (input, "bigskip")) kin = BIGSKIP;
else if (prefixIs (input, "vfill")) kin = VFILL;
else if (isValidGlueLength (input, &len))
kin = LENGTH;
else if (sscanf (input.c_str(), "%f", &value) == 1) {
// This last one is for reading old .lyx files
// without units in added_space_top/bottom.
// Let unit default to centimeters here.
kin = LENGTH;
len = LyXGlueLength (value, LyXLength::CM);
}
}
bool VSpace::operator== (VSpace const & other) const
{
if (this->kin == other.kin)
if (this->kin == LENGTH)
if (this->len == other.len)
return this->kp == other.kp;
else
return false;
else
return this->kp == other.kp;
else
return false;
}
string VSpace::asLyXCommand() const
{
string result;
switch (kin) {
case NONE: break;
case DEFSKIP: result = "defskip"; break;
case SMALLSKIP: result = "smallskip"; break;
case MEDSKIP: result = "medskip"; break;
case BIGSKIP: result = "bigskip"; break;
case VFILL: result = "vfill"; break;
case LENGTH: result = len.asString(); break;
}
if (kp && (kin != NONE) && (kin != DEFSKIP))
return result += '*';
else
return result;
}
string VSpace::asLatexCommand() const
{
switch (kin) {
case NONE: return string();
case DEFSKIP:
return current_view->buffer()->params.getDefSkip().asLatexCommand();
case SMALLSKIP: return kp ? "\\vspace*{\\smallskipamount}"
: "\\smallskip{}";
case MEDSKIP: return kp ? "\\vspace*{\\medskipamount}"
: "\\medskip{}";
case BIGSKIP: return kp ? "\\vspace*{\\bigskipamount}"
: "\\bigskip{}";
case VFILL: return kp ? "\\vspace*{\\fill}"
: "\\vfill{}";
case LENGTH: return kp ? "\\vspace*{" + len.asLatexString() + '}'
: "\\vspace{" + len.asLatexString() + '}';
}
return string(); // should never be reached
}
int VSpace::inPixels() const
{
// Height of a normal line in pixels (zoom factor considered)
int height = current_view->buffer()->text->DefaultHeight(); // [pixels]
// Zoom factor specified by user in percent
float const zoom = lyxrc->zoom / 100.0; // [percent]
// DPI setting for monitor: pixels/inch
float const dpi = lyxrc->dpi; // screen resolution [pixels/inch]
// We want the result in pixels
float result, value;
switch (kin) {
case NONE: return 0;
case DEFSKIP:
return current_view->buffer()->params.getDefSkip().inPixels();
// This is how the skips are normally defined by
// LateX. But there should be some way to change
// this per document.
case SMALLSKIP: return height/4;
case MEDSKIP: return height/2;
case BIGSKIP: return height;
case VFILL: return 3*height;
// leave space for the vfill symbol
case LENGTH:
// Pixel values are scaled so that the ratio
// between lengths and font sizes on the screen
// is the same as on paper.
// we don't care about sign of value, we
// can't display negative anyway
result = 0.0;
value = len.value();
short val_sign = value < 0.0 ? -1 : 1;
switch (len.unit()) {
case LyXLength::SP:
// Scaled point: sp = 1/65536 pt
result = zoom * dpi * value
/ (72.27 * 65536); // 4736286.7
break;
case LyXLength::PT:
// Point: 1 pt = 1/72.27 inch
result = zoom * dpi * value
/ 72.27; // 72.27
break;
case LyXLength::BP:
// Big point: 1 bp = 1/72 inch
result = zoom * dpi * value
/ 72; // 72
break;
case LyXLength::DD:
// Didot: 1157dd = 1238 pt?
result = zoom * dpi * value
/ (72.27/(0.376 * 2.845)); // 67.559735
break;
case LyXLength::MM:
// Millimeter: 1 mm = 1/25.4 inch
result = zoom * dpi * value
/ 25.4; // 25.4
break;
case LyXLength::PC:
// Pica: 1 pc = 12 pt
result = zoom * dpi * value
/ (72.27/12); // 6.0225
break;
case LyXLength::CC:
// Cicero: 1 cc = 12 dd
result = zoom * dpi * value
/ (72.27/ (12*0.376*2.845)); // 5.6299779
break;
case LyXLength::CM:
// Centimeter: 1 cm = 1/2.54 inch
result = zoom * dpi * value
/ 2.54; // 2.54
break;
case LyXLength::IN:
// Inch
result = zoom * dpi * value;
break;
case LyXLength::EX:
// Ex: The height of an "x"
result = zoom * value * height / 2; // what to / width?
break;
case LyXLength::EM: // what to / width?
// Em: The width of an "m"
result = zoom * value * height / 2; // Why 2?
break;
case LyXLength::MU: // This is probably only allowed in
// math mode
result = zoom * value * height;
break;
case LyXLength::UNIT_NONE:
result = 0; // this cannot happen
break;
}
return int (result * val_sign + 0.5);
}
return 0; // never reached
}
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