lyx_mirror/src/vspace.C
Lars Gullik Bjønnes 33a28bdc9c Add string << operators for the other streams as well, and removes
c_str() all places where it is not needed anymore.
(I also add config.h to several files that was missing it)
+ added s string constructor to math_symbolinset

I also change some "while(" to "while ("

mmm ... yes ... I add a "zero()" function to LyXLength... an "empty()"
function did not seem appropriate. changed a couple of places that
checked on length.value() != 0.0.


git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@3149 a592a061-630c-0410-9148-cb99ea01b6c8
2001-12-05 08:04:20 +00:00

552 lines
13 KiB
C

/* This file is part of
* ======================================================
*
* LyX, The Document Processor
*
* Copyright 1995 Matthias Ettrich
* Copyright 1995-2001 The LyX Team.
*
* ====================================================== */
#include <config.h>
#ifdef __GNUG__
#pragma implementation
#endif
#include "vspace.h"
#include "lengthcommon.h"
#include "lyx_main.h"
#include "buffer.h"
#include "lyxrc.h"
#include "lyxtext.h"
#include "BufferView.h"
#include "support/lstrings.h"
#include <cstdio>
namespace {
double number[4] = { 0, 0, 0, 0 };
LyXLength::UNIT unit[4] = { LyXLength::UNIT_NONE,
LyXLength::UNIT_NONE,
LyXLength::UNIT_NONE,
LyXLength::UNIT_NONE };
int number_index;
int unit_index;
inline
void lyx_advance(string & data, string::size_type n)
{
data.erase(0, n);
}
inline
bool isEndOfData(string const & data)
{
return frontStrip(data).empty();
}
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 = data.find_first_not_of("0123456789.");
if (i != 0) {
if (number_index > 3) return 'E';
string buffer;
// we have found some number
if (i == string::npos) {
buffer = data;
i = data.size() + 1;
} else
buffer = data.substr(0, i);
lyx_advance(data, i);
if (isStrDbl(buffer)) {
number[number_index] = strToDbl(buffer);
++number_index;
return 'n';
} else return 'E';
}
i = data.find_first_not_of("abcdefghijklmnopqrstuvwxyz%");
if (i != 0) {
if (unit_index > 3) return 'E';
string buffer;
// we have found some alphabetical string
if (i == string::npos) {
buffer = data;
i = data.size() + 1;
} else
buffer = data.substr(0, i);
// possibly we have "mmplus" string or similar
if (buffer.size() > 5 && (buffer.substr(2,4) == string("plus") || buffer.substr(2,5) == string("minus"))) {
lyx_advance(data, 2);
unit[unit_index] = unitFromString(buffer.substr(0, 2));
} else {
lyx_advance(data, i);
unit[unit_index] = unitFromString(buffer);
}
if (unit[unit_index] != LyXLength::UNIT_NONE) {
++unit_index;
return 'u';
} else return 'E'; // Error
}
return 'E'; // Error
}
}
struct LaTeXLength {
char const * pattern;
int plus_val_index;
int minus_val_index;
int plus_uni_index;
int minus_uni_index;
};
LaTeXLength 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
};
} // namespace anon
const char * stringFromUnit(int unit)
{
if (unit < 0 || unit >= num_units)
return 0;
return unit_name[unit];
}
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:
int 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;
int table_index = 0;
char pattern[20];
number_index = 1;
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->len_.value (number[1] * val_sign);
result->len_.unit (unit[1]);
result->plus_.value (number[table[table_index].plus_val_index]);
result->plus_.unit (unit [table[table_index].plus_uni_index]);
result->minus_.value(number[table[table_index].minus_val_index]);
result->minus_.unit (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.
if (data.empty())
return true;
string buffer = data;
int pattern_index = 0;
char pattern[3];
// To make isValidLength recognize negative values
// this little hack is needed:
int 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->unit_ = unit[1];
}
return true;
}
//
// VSpace class
//
VSpace::VSpace()
: kind_(NONE), len_(), keep_(false)
{}
VSpace::VSpace(vspace_kind k)
: kind_(k), len_(), keep_(false)
{}
VSpace::VSpace(LyXLength const & l)
: kind_(LENGTH), len_(l), keep_(false)
{}
VSpace::VSpace(LyXGlueLength const & l)
: kind_(LENGTH), len_(l), keep_(false)
{}
VSpace::VSpace(string const & data)
: kind_(NONE), len_(), keep_(false)
{
if (data.empty())
return;
double value;
string input = strip(data);
string::size_type const length = input.length();
if (length > 1 && input[length-1] == '*') {
keep_ = true;
input.erase(length - 1);
}
if (prefixIs (input, "defskip")) kind_ = DEFSKIP;
else if (prefixIs (input, "smallskip")) kind_ = SMALLSKIP;
else if (prefixIs (input, "medskip")) kind_ = MEDSKIP;
else if (prefixIs (input, "bigskip")) kind_ = BIGSKIP;
else if (prefixIs (input, "vfill")) kind_ = VFILL;
else if (isValidGlueLength(input, &len_)) kind_ = LENGTH;
else if (sscanf(input.c_str(), "%lf", &value) == 1) {
// This last one is for reading old .lyx files
// without units in added_space_top/bottom.
// Let unit default to centimeters here.
kind_ = LENGTH;
len_ = LyXGlueLength(LyXLength(value, LyXLength::CM));
}
}
VSpace::vspace_kind VSpace::kind() const
{
return kind_;
}
LyXGlueLength VSpace::length() const
{
return len_;
}
bool VSpace::keep() const
{
return keep_;
}
void VSpace::setKeep(bool val)
{
keep_ = val;
}
bool VSpace::operator==(VSpace const & other) const
{
if (kind_ != other.kind_)
return false;
if (kind_ != LENGTH)
return this->keep_ == other.keep_;
if (len_ != other.len_)
return false;
return keep_ == other.keep_;
}
string const VSpace::asLyXCommand() const
{
string result;
switch (kind_) {
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 (keep_ && kind_ != NONE && kind_ != DEFSKIP)
result += '*';
return result;
}
string const VSpace::asLatexCommand(BufferParams const & params) const
{
switch (kind_) {
case NONE: return string();
case DEFSKIP:
return params.getDefSkip().asLatexCommand(params);
case SMALLSKIP: return keep_ ? "\\vspace*{\\smallskipamount}"
: "\\smallskip{}";
case MEDSKIP: return keep_ ? "\\vspace*{\\medskipamount}"
: "\\medskip{}";
case BIGSKIP: return keep_ ? "\\vspace*{\\bigskipamount}"
: "\\bigskip{}";
case VFILL: return keep_ ? "\\vspace*{\\fill}"
: "\\vfill{}";
case LENGTH: return keep_ ? "\\vspace*{" + len_.asLatexString() + '}'
: "\\vspace{" + len_.asLatexString() + '}';
}
return string(); // should never be reached
}
int VSpace::inPixels(BufferView * bv) const
{
// Height of a normal line in pixels (zoom factor considered)
int default_height = bv->text->defaultHeight(); // [pixels]
int default_skip = 0;
int default_width = bv->workWidth();
if (kind_ == DEFSKIP)
default_skip = bv->buffer()->params.getDefSkip().inPixels(bv);
// Height of a normal line in pixels (zoom factor considered)
int height = default_height; // [pixels]
// Zoom factor specified by user in percent
double const zoom = lyxrc.zoom / 100.0; // [percent]
// DPI setting for monitor: pixels/inch
double const dpi = lyxrc.dpi; // screen resolution [pixels/inch]
// We want the result in pixels
double result;
double value;
switch (kind_) {
case NONE:
return 0;
case DEFSKIP:
return default_skip;
// 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
// display negative space with text too
result = 0.0;
value = len_.len().value();
int val_sign = value < 0.0 ? -1 : 1;
switch (len_.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::PW: // Always % of workarea
case LyXLength::PE:
case LyXLength::PP:
case LyXLength::PL:
result = value * default_width / 100;
break;
case LyXLength::UNIT_NONE:
result = 0; // this cannot happen
break;
}
return static_cast<int>(result * val_sign + 0.5);
}
return 0; // never reached
}