mirror of
https://git.lyx.org/repos/lyx.git
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367 lines
9.0 KiB
C++
367 lines
9.0 KiB
C++
/**
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* \file lengthcommon.cpp
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* This file is part of LyX, the document processor.
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* Licence details can be found in the file COPYING.
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*
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* \author Lars Gullik Bjønnes
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* \author Matthias Ettrich
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* \author John Levon
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*
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* Full author contact details are available in file CREDITS.
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*/
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#include <config.h>
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#include "support/convert.h"
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#include "support/gettext.h"
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#include "support/lassert.h"
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#include "support/Length.h"
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#include "support/lstrings.h"
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using namespace std;
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using namespace lyx::support;
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namespace lyx {
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// I am not sure if "mu" should be possible to select (Lgb)
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// the latex units
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char const * const unit_name[] = {
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"bp", "cc", "cm", "dd", "em", "ex", "in", "mm", "mu",
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"pc", "pt", "sp",
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"text%", "col%", "page%", "line%",
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"theight%", "pheight%", "baselineskip%", "" };
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int const num_units = int(sizeof(unit_name) / sizeof(unit_name[0]) - 1);
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// the LyX gui units
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char const * const unit_name_gui[] = {
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N_("bp"), N_("cc[[unit of measure]]"), N_("cm"), N_("dd"), N_("em"),
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N_("ex"), N_("in[[unit of measure]]"), N_("mm"), N_("mu[[unit of measure]]"), N_("pc"),
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N_("pt"), N_("sp"), N_("Text Width %"),
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N_("Column Width %"), N_("Page Width %"), N_("Line Width %"),
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N_("Text Height %"), N_("Page Height %"), N_("Line Distance %"), "" };
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Length::UNIT unitFromString(string const & data)
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{
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int i = 0;
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while (i < num_units && data != unit_name[i])
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++i;
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return static_cast<Length::UNIT>(i);
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}
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namespace {
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/// skip n characters of input
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inline void lyx_advance(string & data, size_t n)
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{
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data.erase(0, n);
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}
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/// return true when the input is at the end
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inline bool isEndOfData(string const & data)
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{
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return ltrim(data).empty();
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}
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/**
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* nextToken - return the next token in the input
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* @param data input string
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* @param number_index the current position in the number array
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* @param unit_index the current position in the unit array
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* @return a char representing the type of token returned
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*
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* The possible return values are :
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* + stretch indicator for glue length
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* - shrink indicator for glue length
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* n a numeric value (stored in number array)
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* u a unit type (stored in unit array)
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* E parse error
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*/
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char nextToken(string & data, double * number, int & number_index,
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Length::UNIT * unit, int & unit_index)
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{
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data = ltrim(data);
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if (data.empty())
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return '\0';
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if (data[0] == '+') {
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lyx_advance(data, 1);
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return '+';
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}
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if (prefixIs(data, "plus")) {
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lyx_advance(data, 4);
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return '+';
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}
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if (data[0] == '-') {
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lyx_advance(data, 1);
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return '-';
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}
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if (prefixIs(data, "minus")) {
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lyx_advance(data, 5);
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return '-';
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}
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size_t i = data.find_first_not_of("0123456789.");
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if (i != 0) {
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if (number_index > 3)
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return 'E';
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string buffer;
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// we have found some number
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if (i == string::npos) {
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buffer = data;
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i = data.size() + 1;
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} else {
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buffer = data.substr(0, i);
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}
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lyx_advance(data, i);
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if (isStrDbl(buffer)) {
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number[number_index] = convert<double>(buffer);
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++number_index;
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return 'n';
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}
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return 'E';
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}
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i = data.find_first_not_of("abcdefghijklmnopqrstuvwxyz%");
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if (i != 0) {
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if (unit_index > 3)
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return 'E';
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string buffer;
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// we have found some alphabetical string
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if (i == string::npos) {
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buffer = data;
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i = data.size() + 1;
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} else {
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buffer = data.substr(0, i);
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}
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// possibly we have "mmplus" string or similar
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if (buffer.size() > 5 &&
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(buffer.substr(2, 4) == string("plus") ||
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buffer.substr(2, 5) == string("minus")))
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{
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lyx_advance(data, 2);
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unit[unit_index] = unitFromString(buffer.substr(0, 2));
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} else {
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lyx_advance(data, i);
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unit[unit_index] = unitFromString(buffer);
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}
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if (unit[unit_index] != Length::UNIT_NONE) {
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++unit_index;
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return 'u';
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}
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return 'E'; // Error
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}
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return 'E'; // Error
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}
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/// latex representation of a vspace
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struct LaTeXLength {
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char const * pattern;
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int plus_val_index;
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int minus_val_index;
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int plus_uni_index;
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int minus_uni_index;
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};
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/// the possible formats for a vspace string
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LaTeXLength table[] = {
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{ "nu", 0, 0, 0, 0 },
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{ "nu+nu", 2, 0, 2, 0 },
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{ "nu+nu-nu", 2, 3, 2, 3 },
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{ "nu+-nu", 2, 2, 2, 2 },
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{ "nu-nu", 0, 2, 0, 2 },
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{ "nu-nu+nu", 3, 2, 3, 2 },
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{ "nu-+nu", 2, 2, 2, 2 },
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{ "n+nu", 2, 0, 1, 0 },
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{ "n+n-nu", 2, 3, 1, 1 },
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{ "n+-nu", 2, 2, 1, 1 },
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{ "n-nu", 0, 2, 0, 1 },
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{ "n-n+nu", 3, 2, 1, 1 },
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{ "n-+nu", 2, 2, 1, 1 },
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{ "", 0, 0, 0, 0 } // sentinel, must be empty
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};
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} // namespace
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const char * stringFromUnit(int unit)
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{
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if (unit < 0 || unit > num_units)
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return nullptr;
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return unit_name[unit];
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}
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bool isValidGlueLength(string const & data, GlueLength * result)
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{
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// This parser is table-driven. First, it constructs a "pattern"
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// that describes the sequence of tokens in "data". For example,
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// "n-nu" means: number, minus sign, number, unit. As we go along,
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// numbers and units are stored into static arrays. Then, "pattern"
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// is searched in the "table". If it is found, the associated
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// table entries tell us which number and unit should go where
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// in the Length structure. Example: if "data" has the "pattern"
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// "nu+nu-nu", the associated table entries are "2, 3, 2, 3".
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// That means, "plus_val" is the second number that was seen
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// in the input, "minus_val" is the third number, and "plus_uni"
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// and "minus_uni" are the second and third units, respectively.
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// ("val" and "uni" are always the first items seen in "data".)
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// This is the most elegant solution I could find -- a straight-
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// forward approach leads to very long, tedious code that would be
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// much harder to understand and maintain. (AS)
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if (data.empty()) {
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if (result)
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*result = GlueLength();
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return true;
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}
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string buffer = ltrim(data);
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// To make isValidGlueLength recognize negative values as
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// the first number this little hack is needed:
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int val_sign = 1; // positive as default
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switch (buffer[0]) {
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case '-':
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lyx_advance(buffer, 1);
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val_sign = -1;
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break;
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case '+':
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lyx_advance(buffer, 1);
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break;
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default:
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break;
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}
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// end of hack
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// used to return numeric values in parsing vspace
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double number[4] = { 0, 0, 0, 0 };
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// used to return unit types in parsing vspace
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Length::UNIT unit[4] = {Length::UNIT_NONE, Length::UNIT_NONE,
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Length::UNIT_NONE, Length::UNIT_NONE};
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int number_index = 1; // entries at index 0 are sentinels
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int unit_index = 1; // entries at index 0 are sentinels
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// construct "pattern" from "data"
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size_t const pattern_max_size = 20;
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string pattern;
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while (!isEndOfData(buffer)) {
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if (pattern.size() > pattern_max_size)
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return false;
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char const c = nextToken(buffer, number, number_index, unit,
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unit_index);
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if (c == 'E')
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return false;
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pattern.push_back(c);
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}
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// search "pattern" in "table"
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size_t table_index = 0;
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while (pattern != table[table_index].pattern) {
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++table_index;
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if (!*table[table_index].pattern)
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return false;
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}
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// Get the values from the appropriate places. If an index
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// is zero, the corresponding array value is zero or UNIT_NONE,
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// so we needn't check this.
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if (result) {
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result->len_.value (number[1] * val_sign);
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result->len_.unit (unit[1]);
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result->plus_.value (number[table[table_index].plus_val_index]);
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result->plus_.unit (unit [table[table_index].plus_uni_index]);
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result->minus_.value(number[table[table_index].minus_val_index]);
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result->minus_.unit (unit [table[table_index].minus_uni_index]);
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}
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return true;
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}
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bool isValidLength(string const & data, Length * result)
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{
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// This is a trimmed down version of isValidGlueLength.
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// The parser may seem overkill for lengths without
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// glue, but since we already have it, using it is
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// easier than writing something from scratch.
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if (data.empty()) {
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if (result)
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*result = Length();
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return true;
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}
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string buffer = data;
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// To make isValidLength recognize negative values
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// this little hack is needed:
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int val_sign = 1; // positive as default
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switch (buffer[0]) {
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case '-':
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lyx_advance(buffer, 1);
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val_sign = -1;
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break;
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case '+':
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lyx_advance(buffer, 1);
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// fall through
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default:
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// no action
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break;
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}
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// end of hack
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// used to return numeric values in parsing vspace
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double number[4] = { 0, 0, 0, 0 };
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// used to return unit types in parsing vspace
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Length::UNIT unit[4] = {Length::UNIT_NONE, Length::UNIT_NONE,
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Length::UNIT_NONE, Length::UNIT_NONE};
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int number_index = 1; // entries at index 0 are sentinels
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int unit_index = 1; // entries at index 0 are sentinels
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// construct "pattern" from "data"
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string pattern;
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while (!isEndOfData(buffer)) {
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if (pattern.size() > 2)
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return false;
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char const token = nextToken(buffer, number,
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number_index, unit, unit_index);
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if (token == 'E')
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return false;
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pattern += token;
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}
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// only the most basic pattern is accepted here
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if (pattern != "nu")
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return false;
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// It _was_ a correct length string.
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// Store away the values we found.
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if (result) {
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result->val_ = number[1] * val_sign;
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result->unit_ = unit[1];
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}
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return true;
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}
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} // namespace lyx
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