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opennurbs/opennurbs_parse_number.cpp
Bozo The Builder 60f8f82f2f Sync changes from upstream repository 
Co-authored-by: David Eränen <david.eranen@mcneel.com>
Co-authored-by: piac <giulio@mcneel.com>
Co-authored-by: Steve Baer <steve@mcneel.com>
2023-02-27 12:29:30 -08:00

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//
// Copyright (c) 1993-2022 Robert McNeel & Associates. All rights reserved.
// OpenNURBS, Rhinoceros, and Rhino3D are registered trademarks of Robert
// McNeel & Associates.
//
// THIS SOFTWARE IS PROVIDED "AS IS" WITHOUT EXPRESS OR IMPLIED WARRANTY.
// ALL IMPLIED WARRANTIES OF FITNESS FOR ANY PARTICULAR PURPOSE AND OF
// MERCHANTABILITY ARE HEREBY DISCLAIMED.
//
// For complete openNURBS copyright information see <http://www.opennurbs.org>.
//
////////////////////////////////////////////////////////////////
#include "opennurbs.h"
#if !defined(ON_COMPILING_OPENNURBS)
// This check is included in all opennurbs source .c and .cpp files to insure
// ON_COMPILING_OPENNURBS is defined when opennurbs source is compiled.
// When opennurbs source is being compiled, ON_COMPILING_OPENNURBS is defined
// and the opennurbs .h files alter what is declared and how it is declared.
#error ON_COMPILING_OPENNURBS must be defined when compiling opennurbs
#endif
static void DisableCompoundUnitParsingStuff(
ON_ParseSettings& parse_settings
)
{
parse_settings.SetParseFeetInches(false);
parse_settings.SetParseArcDegreesMinutesSeconds(false);
}
static void DisableStartAndExpressionParsingStuff(
ON_ParseSettings& parse_settings
)
{
// parsing of things that have multiple numbers like
// feet and inches, arc degrees minutes seconds,
// integer-fraction and rational numbers uses
// this helper to prevent "fancy" stuff when parsing
// the "additional" numbers.
parse_settings.SetParseLeadingWhiteSpace(false);
parse_settings.SetParseUnaryMinus(false);
parse_settings.SetParseUnaryPlus(false);
parse_settings.SetAllExpressionSettingsToFalse();
DisableCompoundUnitParsingStuff(parse_settings);
}
static int GetExplicitFormulaEndIndex(
const wchar_t* str,
int str_index,
int str_count,
const ON_ParseSettings& input_parse_settings,
int& formula_index0,
int& formula_index1
)
{
formula_index0 = 0;
formula_index1 = 0;
if ( !input_parse_settings.ParseExplicitFormulaExpression() )
return 0;
if ( str_index+2 >= str_count )
return 0;
if ( '=' != str[str_index] )
return 0;
if ( '(' != str[str_index+1] )
return 0;
str_index += 2;
while ( str_index < str_count
&& input_parse_settings.IsLeadingWhiteSpace(str[str_index])
)
{
str_index++;
}
formula_index0 = str_index;
int paren_count = 1;
while ( str_index < str_count
&& 0 != str[str_index]
&& paren_count > 0
)
{
switch( str[str_index] )
{
case '(':
paren_count++;
break;
case ')':
paren_count--;
if ( 0 == paren_count )
formula_index1 = str_index;
break;
default:
break;
}
str_index++;
}
if ( 0 != paren_count )
return 0;
while ( formula_index1 > formula_index0
&& input_parse_settings.IsInteriorWhiteSpace(str[formula_index1])
)
{
formula_index1--;
}
if ( formula_index1 <= formula_index0 )
return 0;
// str[formula_index0]...str[formula_index1-1]
// is what was parsed by the old parsing code.
return str_index;
}
static int ParseExplicitFormulaHelper(
const wchar_t* str,
int str_index,
int str_count,
ON_ParseSettings& input_parse_settings,
ON_ParseSettings* parse_results,
double* value
)
{
// Support for old V5 =( ... ) syntax
const int str_index0 = str_index;
int str_index1 = 0;
int formula_index0 = 0;
int formula_index1 = 0;
str_index = 0;
for(;;)
{
str_index1 = GetExplicitFormulaEndIndex(
str,str_index0,str_count,input_parse_settings,
formula_index0,formula_index1
);
if ( str_index1 <= 0 )
break;
if ( formula_index1 <= formula_index0 )
break;
if ( formula_index0 < str_index0+2 )
break;
if ( formula_index1+1 > str_index1 )
break;
if ( str_index1 < str_index0+3+formula_index1-formula_index0)
break;
input_parse_settings.SetParseExplicitFormulaExpression(false);
input_parse_settings.SetParseIntegerDashFraction(false);
double x = ON_UNSET_VALUE;
ON_ParseSettings pr(ON_ParseSettings::FalseSettings);
int formula_count = formula_index1-formula_index0;
int parsed_formula_count = ON_ParseNumberExpression(
str+formula_index0,
formula_count,
input_parse_settings,
&pr,
&x
);
if ( parsed_formula_count <= 0 )
break;
if ( parsed_formula_count <= 0 )
break;
if ( !ON_IsValid(x) )
break;
pr.SetParseExplicitFormulaExpression(true);
str_index = str_index1;
if ( parse_results )
*parse_results = pr;
if ( value )
*value = x;
break;
}
return str_index;
}
static int ON_ParsePiHelper(
const wchar_t* str,
int str_index,
int str_count,
const ON_ParseSettings& input_parse_settings,
ON_ParseSettings& pr,
double* value
)
{
if ( input_parse_settings.ParsePi()
&& str_index >= 0
&& 0 != str
&& str_index < str_count
)
{
int pi_str_count = 0;
switch(str[str_index])
{
case 0x03A0: // UNICODE GREEK CAPITAL LETTER PI
case 0x03C0: // UNICODE GREEK SMALL LETTER PI
pi_str_count = 1;
break;
case 'P':
case 'p':
if ( -1 == str_count || str_index+1 < str_count )
{
if ('I' == str[str_index+1] || 'i' == str[str_index+1] )
pi_str_count = 2;
}
break;
}
if ( pi_str_count > 0 )
{
*value = ON_PI;
pr.SetParsePi(true);
str_index += pi_str_count;
return str_index;
}
}
return 0;
}
static int ON_ParseDoubleExponentHelper(
const wchar_t* str,
int str_index,
int str_count,
const ON_ParseSettings& input_parse_settings,
char* buffer,
unsigned int& buffer_count,
unsigned int buffer_capacity
)
{
char c;
if ( str_index + 1 >= str_count )
return 0;
if ( !input_parse_settings.ParseScientificENotation() )
return 0;
if ( !input_parse_settings.IsDecimalExponentSymbol(str[str_index]) )
return 0;
unsigned int buffer_index = buffer_count;
if ( buffer_index >= buffer_capacity )
return 0;
buffer[buffer_index++] = 'e';
const unsigned int buffer_exponent_index = buffer_index;
str_index++;
if ( str_index < str_count )
{
if ( input_parse_settings.IsUnaryMinus(str[str_index]) )
{
if ( buffer_index >= buffer_capacity )
return 0;
buffer[buffer_index++] = '-';
str_index++;
}
else if ( input_parse_settings.IsUnaryPlus(str[str_index]) )
{
str_index++;
}
if ( str_index < str_count && 0 != (c = input_parse_settings.IsDigit(str[str_index])) )
{
if ( buffer_index >= buffer_capacity )
return 0;
bool bExponentIsZero = ('0' == c);
buffer[buffer_index++] = c;
str_index++;
while ( str_index < str_count
&& 0 != (c = input_parse_settings.IsDigit(str[str_index]))
)
{
str_index++;
if ( bExponentIsZero )
{
if ('0' == c )
continue;
bExponentIsZero = false;
buffer_index--;
}
if ( buffer_index >= buffer_capacity )
return 0;
buffer[buffer_index++] = c;
}
if ( bExponentIsZero )
{
buffer_index = buffer_exponent_index;
buffer[buffer_index++] = '0';
}
buffer_count = buffer_index;
return str_index;
}
}
return 0;
}
static int ON_ParseDoubleHelper(
const wchar_t* str,
int str_index,
int str_count,
const ON_ParseSettings& input_parse_settings,
ON_ParseSettings& pr,
double* value
)
{
// Please discuss any changes with Dale Lear.
char buffer[256]; // must have room for end of line junk
const unsigned int buffer_capacity = sizeof(buffer)/sizeof(buffer[0]);
unsigned int buffer_count = 0;
char c = 0;
bool bHaveSignificand = false;
bool bHaveSignificandDecimalPoint = false;
if ( str_index < str_count )
{
bool bIntegerPartIsNotZero = false;
const bool bParseDigitSeparators = input_parse_settings.ParseSignificandDigitSeparators();
bool bParseSignificandIntegerPart = input_parse_settings.ParseSignificandIntegerPart()
|| input_parse_settings.ParseIntegerDashFraction()
|| input_parse_settings.ParseRationalNumber()
;
if ( bParseSignificandIntegerPart
&& 0 != (c = input_parse_settings.IsDigit(str[str_index]))
)
{
if ( buffer_count >= buffer_capacity )
return 0;
if ( bIntegerPartIsNotZero || '0' != c )
{
bIntegerPartIsNotZero = true;
buffer[buffer_count++] = c;
}
bHaveSignificand = true;
pr.SetParseSignificandIntegerPart(true);
for( str_index++; str_index < str_count; str_index++ )
{
c = input_parse_settings.IsDigit(str[str_index]);
if ( 0 != c )
{
if ( buffer_count >= buffer_capacity )
return 0;
if ( bIntegerPartIsNotZero || '0' != c )
{
bIntegerPartIsNotZero = true;
buffer[buffer_count++] = c;
}
continue;
}
if ( bParseDigitSeparators
&& str_index+1 < str_count
&& input_parse_settings.IsDigitSeparator(str[str_index])
&& 0 != input_parse_settings.IsDigit(str[str_index+1])
)
{
pr.SetParseSignificandDigitSeparators(true);
continue;
}
break;
}
}
if ( bHaveSignificand && 0 == buffer_count )
{
buffer[0] = '0';
buffer[1] = 0;
buffer_count = 1;
}
if ( str_index < str_count
&& input_parse_settings.ParseSignificandDecimalPoint()
&& input_parse_settings.IsDecimalPoint(str[str_index])
)
{
bHaveSignificandDecimalPoint = true;
str_index++;
pr.SetParseSignificandDecimalPoint(true);
if ( input_parse_settings.ParseSignificandFractionalPart()
&& 0 != (c = input_parse_settings.IsDigit(str[str_index]))
)
{
if ( buffer_count+1 >= buffer_capacity )
return 0;
buffer[buffer_count++] = '.';
buffer[buffer_count++] = c;
const unsigned int buffer_hundredths_index = buffer_count;
bHaveSignificand = true;
pr.SetParseSignificandFractionalPart(true);
for( str_index++; str_index < str_count; str_index++ )
{
c = input_parse_settings.IsDigit(str[str_index]);
if ( 0 != c )
{
if ( buffer_count+1 >= buffer_capacity )
return 0;
buffer[buffer_count++] = c;
continue;
}
if ( bParseDigitSeparators
&& str_index+1 < str_count
&& input_parse_settings.IsDigitSeparator(str[str_index])
&& input_parse_settings.IsDigit(str[str_index+1])
)
{
pr.SetParseSignificandDigitSeparators(true);
continue;
}
break;
}
while ( buffer_count > buffer_hundredths_index && '0' == buffer[buffer_count-1] )
buffer_count--;
}
}
}
if ( !bHaveSignificand )
return 0;
bool bHaveExponent = false;
int end_of_exponent_index = ON_ParseDoubleExponentHelper(str,str_index,str_count,input_parse_settings,
buffer,buffer_count,buffer_capacity
);
if ( end_of_exponent_index > str_index )
{
bHaveExponent = true;
pr.SetParseScientificENotation(true);
str_index = end_of_exponent_index;
}
if ( buffer_count <= 0 || buffer_count >= buffer_capacity )
return 0;
buffer[buffer_count] = 0;
double x = ON_UNSET_VALUE;
if ( nullptr == ON_String::ToNumber(buffer,ON_DBL_QNAN,&x) )
return 0;
if ( 0 != value )
*value = x;
return str_index;
}
int ON_ParseNumber(
const wchar_t* str,
int str_count,
ON_ParseSettings parse_settings,
ON_ParseSettings* parse_results,
double* value
)
{
const ON_ParseSettings input_parse_settings(parse_settings);
double x = ON_UNSET_VALUE;
ON_ParseSettings pr = ON_ParseSettings::FalseSettings;
if ( 0 != value )
*value = ON_UNSET_VALUE;
if ( 0 != parse_results )
*parse_results = pr;
if ( -1 == str_count )
{
// parse up to non number element (null, ...)
str_count = ON_ParseSettings::max_number_str_count;
}
if ( 0 == str || str_count <= 0 || 0 == str[0] )
return 0;
int str_index = 0;
if ( str_index < str_count
&& input_parse_settings.ParseLeadingWhiteSpace()
&& input_parse_settings.IsLeadingWhiteSpace(str[str_index])
)
{
// skip over leading white space
pr.SetParseLeadingWhiteSpace(true);
while ( str_index < str_count && input_parse_settings.IsLeadingWhiteSpace(str[str_index]) )
{
str_index++;
}
}
bool bIsNegative = false;
if ( str_index < str_count )
{
if ( input_parse_settings.ParseUnaryMinus() && input_parse_settings.IsUnaryMinus(str[str_index] ) )
{
bIsNegative = true;
pr.SetParseUnaryMinus(true);
str_index++;
}
else if ( input_parse_settings.ParseUnaryPlus() && input_parse_settings.IsUnaryPlus(str[str_index] ) )
{
pr.SetParseUnaryPlus(true);
str_index++;
}
}
const int str_index0 = str_index;
for(;;)
{
str_index = ON_ParsePiHelper(
str, str_index0, str_count,
input_parse_settings, pr, &x
);
if ( str_index > str_index0 )
{
break; // got pi
}
str_index = ON_ParseDoubleHelper(
str, str_index0, str_count,
input_parse_settings, pr, &x
);
if ( str_index <= str_index0 )
break;
if ( !ON_IsValid(x)
|| !(x == floor(x))
|| !pr.ParseSignificandIntegerPart()
|| pr.ParseSignificandDecimalPoint()
|| pr.ParseSignificandFractionalPart()
|| pr.ParseScientificENotation()
)
{
// The number we parsed was not an integer
break;
}
if ( str_index+1 >= str_count )
break;
const bool bIsNumberDash = input_parse_settings.IsNumberDash(str[str_index]);
const bool bIsFractionBar = !bIsNumberDash && input_parse_settings.IsRationalNumberFractionBar(str[str_index]);
if ( !bIsNumberDash && !bIsFractionBar )
break;
if ( bIsNumberDash && !input_parse_settings.ParseIntegerDashFraction() )
break;
if ( bIsFractionBar && !input_parse_settings.ParseRationalNumber() )
break;
ON_ParseSettings parse_int = ON_ParseSettings::IntegerNumberSettings;
parse_int.SetParseLeadingWhiteSpace(false);
parse_int.SetParseUnaryPlus(false);
parse_int.SetParseUnaryMinus(false);
// Need another integer value;
double x1 = ON_UNSET_VALUE;
ON_ParseSettings pr1(ON_ParseSettings::FalseSettings);
int str_index1 = ON_ParseDoubleHelper(
str, str_index+1, str_count,
parse_int, pr1, &x1
);
if ( str_index1 <= str_index+1 )
{
break;
}
if ( !ON_IsValid(x1) || x1 != floor(x1) )
{
break;
}
if ( bIsFractionBar )
{
if ( 0.0 == x1 )
break;
x /= x1;
pr |= pr1;
pr.SetParseRationalNumber(true);
str_index = str_index1;
break;
}
// At this point we are parsing integer-dash-fraction in the form I-N/D.
// I, N and D must be integers, N > 0 and D > N.
// If a symbol follows D, it cannot be an arithmetic operator
if ( !bIsNumberDash )
{
// With the code as of 6 SWep 2013, this never happens.
// It is here to prevent future changes from breaking this code.
break;
}
if ( !(x1 > 0.0) )
break;
if ( str_index1+1 >= str_count )
break;
if ( !input_parse_settings.IsRationalNumberFractionBar(str[str_index1]) )
break;
// Need another integer value for the denominator "D" in value = I-N/D
double x2 = ON_UNSET_VALUE;
ON_ParseSettings pr2(ON_ParseSettings::FalseSettings);
int str_index2 = ON_ParseDoubleHelper(
str, str_index1+1, str_count,
parse_int, pr2, &x2
);
if ( str_index2 <= str_index1+1 )
{
break;
}
if ( !ON_IsValid(x2) || x2 != floor(x2) || !(x2 > x1) )
{
break;
}
if ( (str_index2 < str_count || -1 == str_count )
&& parse_settings.ParseArithmeticExpression()
)
{
// c = symbol after the last digit of D in I-N/D
const wchar_t c = str[str_index2];
if ( parse_settings.IsAdditionSymbol(c)
&& parse_settings.ParseAddition()
)
break;
if ( parse_settings.IsSubtractionSymbol(c)
&& parse_settings.ParseSubtraction()
)
break;
if ( parse_settings.IsMultiplicationSymbol(c)
&& parse_settings.ParseMultiplication()
)
break;
if ( parse_settings.IsDivisionSymbol(c)
&& parse_settings.ParseDivision()
)
break;
if ( parse_settings.IsDecimalPoint(c)
&& parse_settings.ParseSignificandDecimalPoint()
)
break;
if ( parse_settings.IsRationalNumberFractionBar(c) )
break;
if ( parse_settings.IsNumberDash(c) )
break;
}
// We have I-N/D where I,N,D are integers and D > N > 0.
//
// (I*D+N)/D is more accurate than I + N/D because the double precision calculation (I*D+N) is typically mathematically exact in the ranges we with.
//x += (x1/x2); // x = I + (N/D)
x = (x*x2 + x1) / x2; // x = (I*D + N)/D
pr |= pr1;
pr |= pr2;
pr.SetParseIntegerDashFraction(true);
str_index = str_index2;
break;
}
if ( str_index > str_index0 )
{
if ( bIsNegative && x > 0.0 )
x = -x;
}
else
{
// parse number failed
str_index = 0;
}
if ( value )
*value = x;
if ( 0 != parse_results )
*parse_results = pr;
return str_index;
}
static void SetParseExpressionError(
const ON_ArithmeticCalculator& calculator,
ON_ParseSettings* parse_results
)
{
if ( 0 != parse_results )
{
switch ( calculator.ErrorCondition() )
{
case ON_ArithmeticCalculator::no_error:
break;
case ON_ArithmeticCalculator::invalid_expression_error:
parse_results->SetParseInvalidExpressionError(true);
break;
case ON_ArithmeticCalculator::divide_by_zero_error:
parse_results->SetParseDivideByZeroError(true);
break;
case ON_ArithmeticCalculator::overflow_error:
parse_results->SetParseOverflowError(true);
break;
default:
break;
}
}
}
#define ON_PARSE_FUNCTIONS
#if defined(ON_PARSE_FUNCTIONS)
static bool IsFunctionNameFirstSymbol(wchar_t c)
{
return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z');
}
class tagFUNCTION
{
public:
const wchar_t* m_function_name;
bool (*m_function)(const double*,double*);
unsigned int m_function_parameter_count;
bool m_bRadiansParameter;
static int CompareFunctionName(
const wchar_t* a,
int a_count,
const wchar_t* b
)
{
wchar_t c, d=0;
for ( int a_index = 0; a_index < a_count; a_index++ )
{
c = a[a_index];
d = *b++;
if ( c >= 'A' && c <= 'Z' )
c += 'a'-'A';
if ( c < d )
return -1;
if ( c > d )
return 1;
if ( 0 == c )
return 0;
}
d = *b++;
if ( 0 < d )
return -1;
if ( 0 > d )
return 1;
return 0;
}
};
static bool atan2_function(const double* a,double* x)
{
if ( 0.0 == a[0] && 0.0 == a[1] )
return false;
*x = atan2(a[0],a[1]);
return true;
}
static bool cos_function(const double* a, double* x)
{
*x = cos(a[0]);
return true;
}
static bool sin_function(const double* a, double* x)
{
*x = sin(a[0]);
return true;
}
static bool tan_function(const double* a, double* x)
{
*x = tan(a[0]);
return true;
}
static bool ln_function(const double* a, double* x)
{
if ( !(a[0] > 0.0) )
return false;
*x = log(a[0]);
return true;
}
static bool log10_function(const double* a, double* x)
{
if ( !(a[0] > 0.0) )
return false;
*x = log10(a[0]);
return true;
}
static bool sqrt_function(const double* a, double* x)
{
if ( !(a[0] >= 0.0) )
return false;
*x = sqrt(a[0]);
return true;
}
static bool acos_function(const double* a, double* x)
{
if ( !(a[0] >= -1.0 && a[0] <= 1.0) )
return false;
*x = acos(a[0]);
return true;
}
static bool asin_function(const double* a, double* x)
{
if ( !(a[0] >= -1.0 && a[0] <= 1.0) )
return false;
*x = asin(a[0]);
return true;
}
static bool atan_function(const double* a, double* x)
{
*x = atan(a[0]);
return true;
}
static bool exp_function(const double* a, double* x)
{
if ( !(a[0] < 709.7827) )
return false; // exp(709.7827) > max double
*x = exp(a[0]);
return true;
}
static bool pow_function(const double* a, double* x)
{
if ( 0.0 == a[0] && a[1] < 0.0 )
return false;
*x = pow(a[0],a[1]);
return true;
}
static bool sinh_function(const double* a, double* x)
{
if ( !(a[0] < 710.4760) )
return false;
*x = sinh(a[0]);
return true;
}
static bool cosh_function(const double* a, double* x)
{
if ( !(a[0] < 710.4760) )
return false;
*x = cosh(a[0]);
return true;
}
static bool tanh_function(const double* a, double* x)
{
*x = tanh(a[0]);
return true;
}
static class tagFUNCTION* GetFunction(
const wchar_t* function_name,
int function_name_count
)
{
static bool bAngleRadiansParameter = true;
static tagFUNCTION f[] =
{
{0,0,0},
{L"acos",acos_function,1,false},
{L"asin",asin_function,1,false},
{L"atan",atan_function,1,false},
{L"atan2",atan2_function,2,false},
{L"cos",cos_function,1,bAngleRadiansParameter},
{L"cosh",cosh_function,1,false},
{L"exp",exp_function,1,false},
{L"ln",ln_function,1,false},
//{L"log",ln_function,1,true},
{L"log10",log10_function,1,false},
{L"pow",pow_function,2,false},
{L"sin",sin_function,1,bAngleRadiansParameter},
{L"sinh",sinh_function,1,false},
{L"sqrt",sqrt_function,1,false},
{L"tan",tan_function,1,bAngleRadiansParameter},
{L"tanh",tanh_function,1,false},
};
int i0 = 1;
int i1 = (int)(sizeof(f)/sizeof(f[0]));
while ( i0 < i1 )
{
int i = (i0+i1)/2;
int j = tagFUNCTION::CompareFunctionName( function_name, function_name_count, f[i].m_function_name );
if ( j < 0 )
i1 = i;
else if ( j > 0 )
i0 = i+1;
else
return &f[i];
}
return 0;
}
static int ON_ParseFunctionHelper(
const wchar_t* str,
int str_count,
const ON_ParseSettings& input_parse_settings,
ON_ParseSettings& pr,
double* value
)
{
// Please discuss any changes with Dale Lear.
double f_parameters[16];
unsigned int f_parameter_count = 0;
unsigned int f_parameter_capacity = (unsigned int)(sizeof(f_parameters)/sizeof(f_parameters[0]));
tagFUNCTION* f = 0;
double f_value = ON_UNSET_VALUE;
int str_index = 0;
if ( !input_parse_settings.ParseArithmeticExpression() )
return false;
if ( !input_parse_settings.ParseMathFunctions() )
return false;
for(;;)
{
if ( str_index >= str_count )
break;
int str_index1;
for ( str_index1 = 0; str_index1 < str_count; str_index1++ )
{
if ( !IsFunctionNameFirstSymbol(str[str_index1]) )
break;
}
if ( str_index1 <= 0 )
break;
while ( str_index1 < str_count && str[str_index1] >= '0' && str[str_index1] <= '9' )
{
str_index1++;
}
if ( str_index1+1 >= str_count )
break;
if ( !input_parse_settings.IsLeftParenthesisSymbol(str[str_index1]) )
break;
f = GetFunction(str,str_index1);
if ( 0 == f )
break;
if ( f->m_function_parameter_count <= 0 )
break;
if ( f_parameter_capacity < f->m_function_parameter_count )
break;
// The angle parameters passed to trig functions always have
// an "implicit" angle system of radians. It is intentional that
// this cannot be changed by parse settings. The reason is
// to insure that the same script will create the same values
// on all computers. The implicit angle units are radians
// because that is what all trig functions use by default
// in C, C++, C#, and python. Please discuss any changes
// with Dale Lear.
ON_ParseSettings psRadiansParameter(input_parse_settings);
psRadiansParameter.SetDefaultAngleUnitSystem(ON::AngleUnitSystem::Radians);
str_index1++;
for ( f_parameter_count = 0;
f_parameter_count < f->m_function_parameter_count;
f_parameter_count++)
{
ON_ParseSettings pr1(ON_ParseSettings::FalseSettings);
f_parameters[f_parameter_count] = ON_UNSET_VALUE;
int str_index2 = f->m_bRadiansParameter
? ON_ParseAngleExpression(str + str_index1, str_count - str_index1 - 1, psRadiansParameter, ON::AngleUnitSystem::Radians, &f_parameters[f_parameter_count], &pr1, 0)
: ON_ParseNumberExpression(str+str_index1,str_count-str_index1-1,input_parse_settings,&pr1,&f_parameters[f_parameter_count]);
pr |= pr1;
if ( str_index2 <= 0 )
break;
if ( pr1.ParseError() )
break;
if ( !ON_IsValid(f_parameters[f_parameter_count]) )
break;
str_index1 += str_index2;
if ( str_index1+1 >= str_count )
break;
if ( f_parameter_count+1 < f->m_function_parameter_count )
{
if ( ',' != str[str_index1] )
break;
}
else if ( !input_parse_settings.IsRightParenthesisSymbol(str[str_index1]) )
break;
str_index1++;
}
if ( f_parameter_count != f->m_function_parameter_count )
break;
if ( !f->m_function(f_parameters,&f_value) )
{
f_value = ON_UNSET_VALUE;
break;
}
str_index += str_index1;
break;
}
if ( value )
*value = f_value;
return str_index;
}
#endif
int ON_ParseNumberExpression(
const wchar_t* str,
int str_count,
ON_ParseSettings parse_settings,
ON_ParseSettings* parse_results,
double* value
)
{
// Please discuss changes with Dale Lear.
// Do not make this funtion recursive.
// This function support parsing limited arithmetic expressions.
ON_ParseSettings input_parse_settings(parse_settings);
ON_ParseSettings pr = ON_ParseSettings::FalseSettings;
if ( 0 != value )
*value = ON_UNSET_VALUE;
if ( 0 != parse_results )
*parse_results = pr;
if ( -1 == str_count )
{
// parse up to non-parsing element (null, ...)
str_count = ON_ParseSettings::max_expression_str_count;
}
if ( 0 == str || str_count <= 0 || 0 == str[0] )
return 0;
int str_index = 0;
if ( str_index < str_count
&& input_parse_settings.ParseLeadingWhiteSpace()
&& input_parse_settings.IsLeadingWhiteSpace(str[str_index])
)
{
// skip over leading white space
pr.SetParseLeadingWhiteSpace(true);
while ( str_index < str_count && input_parse_settings.IsLeadingWhiteSpace(str[str_index]) )
{
str_index++;
}
}
if ( str_index+2 < str_count // room for =(...)
&& '=' == str[str_index]
&& '(' == str[str_index+1]
)
{
// Support for old V5 =( ... ) syntax
str_index = ParseExplicitFormulaHelper(
str,str_index,str_count,
input_parse_settings,
parse_results,
value
);
return str_index;
}
input_parse_settings.SetParseLeadingWhiteSpace(false);
ON_ArithmeticCalculator calculator;
unsigned int parenthesis_depth = 0;
const bool bParseArithmeticExpression = parse_settings.ParseArithmeticExpression();
const bool bParseExplicitMultiplication = bParseArithmeticExpression && parse_settings.ParseMultiplication();
const bool bParseExplicitDivision = bParseArithmeticExpression && parse_settings.ParseDivision();
const bool bParseExplicitAddition = bParseArithmeticExpression && parse_settings.ParseAddition();
const bool bParseExplicitSubtraction = bParseArithmeticExpression && parse_settings.ParseSubtraction();
const bool bParsePairedParenthises = bParseArithmeticExpression && parse_settings.ParsePairedParentheses();
if ( bParseExplicitDivision && input_parse_settings.ParseRationalNumber() )
{
// This adjustment necessary so expressions where like
// (a+b)/c/d with "c" and "d" being integer values
// will be parsed correctly as ((a+b)/c)/d instead of
// being parsed as (a+b)/rational_number_value(c/d).
// Note that disabling rational number parsing does
// not disable integer-hyphen-fraction parsing.
// When integer-hyphen-fraction parsing is enabled,
// 3/1-1/2 will be parsed as 3/1.5 = 2.
input_parse_settings.SetParseRationalNumber(false);
}
while( str_index < str_count && 0 != str[str_index] )
{
if ( input_parse_settings.ParseUnaryMinus() && input_parse_settings.IsUnaryMinus(str[str_index] ) )
{
if ( !calculator.UnaryMinus() )
{
SetParseExpressionError(calculator,parse_results);
return 0;
}
pr.SetParseUnaryMinus(true);
str_index++;
}
else if ( input_parse_settings.ParseUnaryPlus() && input_parse_settings.IsUnaryPlus(str[str_index] ) )
{
pr.SetParseUnaryPlus(true);
str_index++;
}
if ( bParsePairedParenthises && input_parse_settings.IsLeftParenthesisSymbol(str[str_index]) )
{
if ( !calculator.LeftParenthesis() )
{
SetParseExpressionError(calculator,parse_results);
return 0;
}
str_index++;
parenthesis_depth++;
pr.SetParseArithmeticExpression(true);
continue;
}
double x1 = ON_UNSET_VALUE;
ON_ParseSettings pr1(ON_ParseSettings::FalseSettings);
int str_index1 = ON_ParseNumber(str+str_index,str_count-str_index,input_parse_settings,&pr1,&x1);
#if defined(ON_PARSE_FUNCTIONS)
if ( str_index1 == 0 )
{
ON_ParseSettings pr2(ON_ParseSettings::FalseSettings);
str_index1 = ON_ParseFunctionHelper(
str+str_index, str_count-str_index,
input_parse_settings, pr2, &x1
);
if ( str_index1 > 0 )
pr1 = pr2;
}
#endif
if ( str_index1 <= 0 )
break;
if ( str_index + str_index1 > str_count )
break;
if ( pr1.ParsePi() )
{
if ( !calculator.Number(x1) )
{
SetParseExpressionError(calculator,parse_results);
return 0;
}
}
else
{
if ( !calculator.SimpleNumber(x1) )
{
SetParseExpressionError(calculator,parse_results);
return 0;
}
}
pr |= pr1;
str_index += str_index1;
if ( str_index >= str_count )
break;
while ( parenthesis_depth > 0
&& str_index < str_count
&& bParsePairedParenthises
&& input_parse_settings.IsRightParenthesisSymbol(str[str_index])
)
{
if ( !calculator.RightParenthesis() )
{
SetParseExpressionError(calculator,parse_results);
return 0;
}
str_index++;
parenthesis_depth--;
pr.SetParseArithmeticExpression(true);
pr.SetParsePairedParentheses(true);
}
if ( str_index >= str_count )
break;
if ( bParseExplicitMultiplication
&& input_parse_settings.IsMultiplicationSymbol(str[str_index])
)
{
if ( !calculator.Multiply() )
{
SetParseExpressionError(calculator,parse_results);
return 0;
}
str_index++;
pr.SetParseArithmeticExpression(true);
pr.SetParseMultiplication(true);
continue;
}
if ( bParseExplicitDivision
&& input_parse_settings.IsDivisionSymbol(str[str_index])
)
{
if ( !calculator.Divide() )
{
SetParseExpressionError(calculator,parse_results);
return 0;
}
str_index++;
pr.SetParseArithmeticExpression(true);
pr.SetParseDivision(true);
continue;
}
if ( bParseExplicitAddition
&& input_parse_settings.IsAdditionSymbol(str[str_index])
)
{
if ( !calculator.Add() )
{
SetParseExpressionError(calculator,parse_results);
return 0;
}
str_index++;
pr.SetParseArithmeticExpression(true);
pr.SetParseAddition(true);
continue;
}
if ( bParseExplicitSubtraction
&& input_parse_settings.IsSubtractionSymbol(str[str_index])
)
{
if ( !calculator.Subtract() )
{
SetParseExpressionError(calculator,parse_results);
return 0;
}
str_index++;
pr.SetParseArithmeticExpression(true);
pr.SetParseSubtraction(true);
continue;
}
if ( calculator.PendingImpliedMultiplication() )
continue;
break;
}
if ( str_index <= 0 || str_index > str_count )
return 0;
double x = ON_UNSET_VALUE;
if ( !calculator.Evaluate(&x) )
{
x = ON_UNSET_VALUE;
str_index = 0;
pr = ON_ParseSettings::FalseSettings;
SetParseExpressionError(calculator,&pr);
}
if ( value )
*value = x;
if ( 0 != parse_results )
*parse_results = pr;
return str_index;
}
int ON_ParseLengthExpression(
const wchar_t* str,
int str_count,
ON_ParseSettings parse_settings,
double* length_value,
ON_ParseSettings* parse_results,
ON::LengthUnitSystem* str_length_unit_system
)
{
double x = ON_UNSET_VALUE;
ON::LengthUnitSystem length_us = ON::LengthUnitSystem::None;
const ON_ParseSettings input_parse_settings(parse_settings);
ON_ParseSettings pr = ON_ParseSettings::FalseSettings;
if ( 0 != length_value )
*length_value = ON_UNSET_VALUE;
if ( 0 != str_length_unit_system )
*str_length_unit_system = length_us;
if ( 0 != parse_results )
*parse_results = pr;
int str_index = ON_ParseNumberExpression(str,str_count,input_parse_settings,&pr,&x);
if ( str_index <= 0 )
return 0;
if ( -1 != str_count )
{
if (str_index > str_count )
return 0;
str_count -= str_index;
}
const bool bParseWhiteSpaceBetweenValueAndUnitSystem
= (str_index < str_count || -1 == str_count)
&& input_parse_settings.ParseWhiteSpaceBetweenValueAndUnitSystem()
&& input_parse_settings.IsInteriorWhiteSpace(str[str_index]);
ON_ParseSettings parse_unit_name_settings(input_parse_settings);
parse_unit_name_settings.SetParseLeadingWhiteSpace(false);
parse_unit_name_settings.SetParseWhiteSpaceBetweenValueAndUnitSystem(bParseWhiteSpaceBetweenValueAndUnitSystem);
const int end_of_unit_index = ON_ParseLengthUnitName(
str+str_index,
str_count,
parse_unit_name_settings,
&length_us
);
if ( end_of_unit_index > 0 )
{
if ( -1 != str_count )
{
if (end_of_unit_index > str_count )
return 0;
str_count -= end_of_unit_index;
}
str_index += end_of_unit_index;
pr.SetParseWhiteSpaceBetweenValueAndUnitSystem(bParseWhiteSpaceBetweenValueAndUnitSystem);
if ( -1 == str_count || str_count > 0 )
{
if ( ON::LengthUnitSystem::Feet == length_us
&& floor(x) == x
&& input_parse_settings.ParseFeetInches()
&& false == pr.ParseSignificandDecimalPoint()
&& false == pr.ParseScientificENotation()
&& false == pr.ParseRationalNumber()
&& false == pr.ParseMultiplication()
&& false == pr.ParseDivision()
&& false == pr.ParsePi()
&& false == pr.ParseIntegerDashFraction()
)
{
// parse inches part or feet and inches
int inches_index0 = str_index;
ON_ParseSettings parse_inches = input_parse_settings;
DisableStartAndExpressionParsingStuff(parse_inches);
parse_inches.SetParsePi(false);
parse_inches.SetParseFeetInches(false);
double inches_value = ON_UNSET_VALUE;
ON::LengthUnitSystem inches_us = ON::LengthUnitSystem::None;
ON_ParseSettings inches_pr = ON_ParseSettings::FalseSettings;
// Dale Lear 9 April 2014 - fix RH-23095
// Checking for a number dash is required to parse 1'-1-1/2" as 13.5 inches.
int number_dash_count = 0;
if ( input_parse_settings.IsNumberDash(str[inches_index0]) )
{
// It is intentional that the "number dash" between feet and inches
// cannot have leading or trailing interior space.
if (-1 == str_count || str_count >= 3)
{
if ( input_parse_settings.IsDigit(str[inches_index0 + 1]) )
number_dash_count = 1;
if (-1 != str_count)
str_count--;
}
}
// June 10, 2016 Dale Lear
// http://mcneel.myjetbrains.com/youtrack/issue/RH-34577
// Allow embedded interior white space between the feet and inches.
// Example <1' 3"> should parse as 15 inches.
bool bParseWhiteSpaceBetweenFeetAndInches = false;
if (0 == number_dash_count)
{
if (-1 == str_count || str_count >= 3)
{
bParseWhiteSpaceBetweenFeetAndInches
= (str_index < str_count || -1 == str_count)
&& input_parse_settings.ParseWhiteSpaceBetweenFeetAndInches()
&& input_parse_settings.IsInteriorWhiteSpace(str[inches_index0]);
parse_inches.SetParseLeadingWhiteSpace(bParseWhiteSpaceBetweenFeetAndInches);
}
}
int end_of_inches_index = ON_ParseLengthExpression(
str + inches_index0 + number_dash_count,
str_count,
parse_inches,&inches_value,&inches_pr,&inches_us);
if (
end_of_inches_index > 0
&& ON::LengthUnitSystem::None == inches_us
&& inches_value >= 0.0
&& inches_value < 12.0
&& str[inches_index0 + number_dash_count] >= '0'
&& str[inches_index0 + number_dash_count] <= '9'
)
{
// "lazy" inches format 1'6 is parsed as 1'6"
inches_us = ON::LengthUnitSystem::Inches;
}
if ( end_of_inches_index > 0
&& ON::LengthUnitSystem::Inches == inches_us
&& inches_value >= 0.0 // Dale Lear: 1'0" parses as 12 inches http://mcneel.myjetbrains.com/youtrack/issue/RH-34577
&& inches_value < 12.0
)
{
// result of correctly adjusting str_count is never used.
//if ( -1 != str_count)
// str_count -= end_of_inches_index;
str_index = inches_index0 + end_of_inches_index + number_dash_count;
if ( x < 0.0 && inches_value > 0.0 )
x = x*12.0 - inches_value;
else
x = x*12.0 + inches_value;
length_us = ON::LengthUnitSystem::Inches;
pr.SetParseFeetInches(true);
inches_pr.SetParseLeadingWhiteSpace(false);
pr |= inches_pr;
pr.SetParseWhiteSpaceBetweenFeetAndInches(bParseWhiteSpaceBetweenFeetAndInches);
}
}
}
}
else
{
length_us = ON::LengthUnitSystem::None;
}
if ( length_value )
*length_value = x;
if ( 0 != parse_results )
*parse_results = pr;
if ( 0 != str_length_unit_system )
*str_length_unit_system = length_us;
return str_index;
}
static bool Internal_IsInteger(
const wchar_t* str,
int str_count
)
{
if (nullptr == str || str_count < 1)
return false;
for (int i = 0; i < str_count; ++i)
{
if (str[i] >= '0' && str[i] <= '9')
continue;
return false;
}
return true;
}
static bool Internal_IsNegativeInteger(
const ON_ParseSettings& parse_settings,
const wchar_t* str,
int str_count
)
{
if (nullptr == str || str_count < 2 || false == parse_settings.ParseUnaryMinus())
return false;
if (false == parse_settings.IsUnaryMinus(str[0]))
return false;
return Internal_IsInteger(str + 1, str_count - 1);
}
int ON_ParseAngleExpression(
const wchar_t* str,
int str_count,
ON_ParseSettings parse_settings,
double* angle_value,
ON_ParseSettings* parse_results,
ON::AngleUnitSystem* str_angle_unit_system
)
{
double x = ON_UNSET_VALUE;
ON::AngleUnitSystem angle_us = ON::AngleUnitSystem::None;
ON_ParseSettings input_parse_settings(parse_settings);
ON_ParseSettings pr = ON_ParseSettings::FalseSettings;
if ( 0 != angle_value )
*angle_value = ON_UNSET_VALUE;
if ( 0 != str_angle_unit_system )
*str_angle_unit_system = angle_us;
if ( 0 != parse_results )
*parse_results = pr;
bool bNegativeDegreesMinutesSecondsIsPossible = false;
int str_index = 0;
ON__UINT32 cSurveyorsNotationNS = 0;
ON__UINT32 cSurveyorsNotationEW = 0;
if ( input_parse_settings.ParseSurveyorsNotation() )
{
if ( (str_index < str_count || -1 == str_count)
&& input_parse_settings.ParseLeadingWhiteSpace()
&& input_parse_settings.IsLeadingWhiteSpace(str[str_index])
)
{
// skip over leading white space
pr.SetParseLeadingWhiteSpace(true);
while ( str_index < str_count && input_parse_settings.IsLeadingWhiteSpace(str[str_index]) )
{
str_index++;
}
}
input_parse_settings.SetParseLeadingWhiteSpace(false);
if ( ((str_index+3 <= str_count) || -1 == str_count) )
{
// Do not localize "N" or "n" or "S" or "s".
// These letters are specified by Surveyor's notation specification.
// [TODO - Reference needed].
switch(str[str_index])
{
case 'N': // Do not localize this letter
case 'n': // Do not localize this letter
str_index++;
cSurveyorsNotationNS = 'N';
break;
case 'S': // Do not localize this letter
case 's': // Do not localize this letter
str_index++;
cSurveyorsNotationNS = 'S';
break;
}
}
if ( 0 != cSurveyorsNotationNS )
{
input_parse_settings.SetParseIntegerDashFraction(false);
}
const int str_number_count = (str_count > 0 ? str_count-str_index : str_count);
ON_ParseSettings pr1(ON_ParseSettings::FalseSettings);
int str_number_index = ON_ParseNumberExpression(str+str_index,str_number_count,input_parse_settings,&pr1,&x);
if ( str_number_index > 0 )
{
if (0 == cSurveyorsNotationNS && x <= 0.0 && Internal_IsNegativeInteger(input_parse_settings, str + str_index, str_number_index - str_index))
bNegativeDegreesMinutesSecondsIsPossible = true;
pr |= pr1;
}
else
{
if ( input_parse_settings.ParseScientificENotation() )
{
// It may be that the string looked like N15.23E and the number parser failed
// because 15.23E is an invalid attempt at using scientific E notation.
input_parse_settings.SetParseScientificENotation(false);
str_number_index = ON_ParseNumberExpression(str+str_index,str_number_count,input_parse_settings,&pr,&x);
if ( str_number_index <= 0 )
return 0;
if ( 'E' != str[str_number_index] && 'e' != str[str_number_index] )
return 0;
}
}
str_index += str_number_index;
}
else
{
str_index = ON_ParseNumberExpression(str,str_count,input_parse_settings,&pr,&x);
if ( str_index <= 0 )
return 0;
if (0 == cSurveyorsNotationNS && x <= 0.0 && Internal_IsNegativeInteger(input_parse_settings, str, str_index))
bNegativeDegreesMinutesSecondsIsPossible = true;
}
if ( str_count > 0 )
{
if (str_index > str_count )
return 0;
str_count -= str_index;
}
int end_of_unit_index = ON_ParseAngleUnitName(str+str_index,str_count,parse_settings.PreferedLocaleId(),&angle_us);
if (bNegativeDegreesMinutesSecondsIsPossible && ON::AngleUnitSystem::Degrees != angle_us)
bNegativeDegreesMinutesSecondsIsPossible = false;
if ( end_of_unit_index > 0 )
{
if ( str_count > 0 )
{
if (end_of_unit_index > str_count )
return 0;
str_count -= end_of_unit_index;
}
str_index += end_of_unit_index;
if ( -1 == str_count || str_index+1 < str_count )
{
if ( ON::AngleUnitSystem::Degrees == angle_us
&& floor(x) == x
&& input_parse_settings.ParseArcDegreesMinutesSeconds()
&& false == pr.ParseSignificandDecimalPoint()
&& false == pr.ParseScientificENotation()
&& false == pr.ParseRationalNumber()
&& false == pr.ParsePi()
&& false == pr.ParseDivision()
&& false == pr.ParseMultiplication()
&& false == pr.ParseIntegerDashFraction()
)
{
// parse arc minutes
ON_ParseSettings next_parse_settings = input_parse_settings;
DisableStartAndExpressionParsingStuff(next_parse_settings);
next_parse_settings.SetParseSignificandDigitSeparators(false);
next_parse_settings.SetParseIntegerDashFraction(false);
next_parse_settings.SetParseRationalNumber(false);
next_parse_settings.SetParsePi(false);
next_parse_settings.SetParseSurveyorsNotation(false);
next_parse_settings.SetParseUnaryMinus(false);
next_parse_settings.SetParseUnaryPlus(false);
double arc_minutes_value = 0.0;
double arc_seconds_value = 0.0;
for ( int next_value_pass = 0; next_value_pass < 2; next_value_pass++ )
{
double next_value = ON_UNSET_VALUE;
ON::AngleUnitSystem next_us(ON::AngleUnitSystem::None);
ON_ParseSettings next_pr(ON_ParseSettings::FalseSettings);
int next_str_index = ON_ParseAngleExpression(
str+str_index,
((-1 == str_count) ? str_count : (str_count-str_index-1)),
next_parse_settings,&next_value,&next_pr,&next_us);
if ( next_str_index <= 0 )
break;
if (!(next_value >= 0.0 && next_value < 60.0))
{
bNegativeDegreesMinutesSecondsIsPossible = false;
break;
}
if ( 0 == next_value_pass )
{
if ( ON::AngleUnitSystem::Minutes != next_us )
{
if ( ON::AngleUnitSystem::Seconds == next_us && 0 == next_value_pass )
next_value_pass = 1;
else
{
bNegativeDegreesMinutesSecondsIsPossible = false;
break;
}
}
}
else if ( 1 == next_value_pass )
{
if (ON::AngleUnitSystem::Seconds != next_us)
{
bNegativeDegreesMinutesSecondsIsPossible = false;
break;
}
}
if (ON::AngleUnitSystem::Minutes == next_us)
arc_minutes_value = next_value;
else if (ON::AngleUnitSystem::Seconds == next_us)
arc_seconds_value = next_value;
else
bNegativeDegreesMinutesSecondsIsPossible = false;
str_index += next_str_index;
pr.SetParseArcDegreesMinutesSeconds(true);
pr |= next_pr;
}
if (
bNegativeDegreesMinutesSecondsIsPossible
&& x <= 0.0
&& arc_minutes_value >= 0.0
&& arc_seconds_value >= 0.0
)
{
// parsing something like -90d40'30"
if (arc_minutes_value > 0.0)
arc_minutes_value = -arc_minutes_value;
if (arc_seconds_value > 0.0)
arc_seconds_value = -arc_seconds_value;
}
if ( 0 != arc_seconds_value )
{
x = 60.0*(60.0*x + arc_minutes_value) + arc_seconds_value;
angle_us = ON::AngleUnitSystem::Seconds;
}
else if ( 0 != arc_minutes_value )
{
x = 60.0*x + arc_minutes_value;
angle_us = ON::AngleUnitSystem::Minutes;
}
}
}
}
else
{
bNegativeDegreesMinutesSecondsIsPossible = false;
angle_us = parse_settings.DefaultAngleUnitSystem();
}
if ( str_index > 0 && 0 != cSurveyorsNotationNS )
{
if ( str_count > 0 )
{
if (str_index+1 > str_count )
return 0;
}
// Do not localize "E" or "e" or "W" or "w".
// These letters are specified by Surveyor's notation specification.
// [TODO - Reference needed].
switch(str[str_index])
{
case 'E': // Do not localize this letter
case 'e': // Do not localize this letter
str_index++;
cSurveyorsNotationEW = 'E';
break;
case 'W': // Do not localize this letter
case 'w': // Do not localize this letter
str_index++;
cSurveyorsNotationEW = 'W';
break;
default:
cSurveyorsNotationEW = 0;
break;
}
if (0 == cSurveyorsNotationEW )
return 0;
if ( ON::AngleUnitSystem::None == angle_us )
{
// Surveyor's notation implies degrees when no angle unit
// is explictly supplied. This is done because it is
// difficult for many users to enter a degree symbol
// when typing input and Surveyor's notation is almost
// always in degrees. [TODO cite reference].
angle_us = ON::AngleUnitSystem::Degrees;
}
// The value of right_angle is calculated this way because it will
// yield the most precise result in all angle unit systems since
// IEEE double muliplication by 0.25 is exact and the value
// returned by ON::AngleUnitScale(ON::turns,angle_us) is exact
// for all supported angle units except radians where pi rounded
// because the IEEE double must approximate the value of pi.
const double right_angle = 0.25*ON::AngleUnitScale(ON::AngleUnitSystem::Turns,angle_us);
switch(cSurveyorsNotationNS)
{
case 'N':
switch(cSurveyorsNotationEW)
{
case 'E': // N<angle>E
x = right_angle - x;
break;
case 'W': // N<angle>W
x = right_angle + x;
break;
default:
return 0;
}
break;
case 'S':
switch(cSurveyorsNotationEW)
{
case 'E': // S<angle>E
x = -(right_angle - x);
break;
case 'W': // S<angle>W
x = -(right_angle + x);
break;
default:
return 0;
}
break;
default:
return 0;
}
}
if ( angle_value )
*angle_value = x;
if ( 0 != parse_results )
*parse_results = pr;
if ( 0 != str_angle_unit_system )
*str_angle_unit_system = angle_us;
return str_index;
}
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