42/42_EXT_05_computorv1
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

fix parse coefficient

Browse Source
This commit is contained in:
hugogogo
2026-05-03 21:52:41 +02:00
parent 6157fdb59f
commit 07144c53c6
3 changed files with 44 additions and 48 deletions
Download Patch File Download Diff File Expand all files Collapse all files

84
src/parser.c
View File

@@ -3,17 +3,6 @@
#include "computorv1.h"
/**
TOKEN_VARIABLE, // x, y, etc.
TOKEN_NUMBER_INT, // int
TOKEN_NUMBER_DOUBLE, // double
TOKEN_POWER, // ^ or **
TOKEN_SIGN_PLUS, // +
TOKEN_SIGN_MINUS, // -
TOKEN_FACTOR_MULT, // *
TOKEN_FACTOR_DIV, // / or :
TOKEN_EQUAL, // =
TOKEN_END // null (end of input)
1. VAR | NUMBER_I | NUMBER_D | ! POW | SIGN_P | SIGN_M | ! FACTOR_MUL | ! FACTOR_DIV | ! EQUAL | END
NT | NUMBER | NT | SIGN | ! FACTOR | NT | NT
@@ -22,12 +11,6 @@
3. VAR | ! NUMBER_I | ! NUMBER_D | ! POW | ! SIGN_P | ! SIGN_M | FACTOR_MUL | ! FACTOR_DIV | ! EQUAL | END
NT | ! NUMBER | NT | ! SIGN | FACTOR | NT | NT
term_position position;
term_sign sign;
coefficient_type coefficient_type;
int coefficient;
int exponent;
*/
static term_sign get_sign(token *tokens, int i, int *token_count)
@@ -50,7 +33,6 @@ static term_sign get_sign(token *tokens, int i, int *token_count)
if (tokens[i].tag == TOKEN_SIGN)
{
*token_count = 1;
return tokens[i].type == TOKEN_SIGN_PLUS ? TERM_PLUS : TERM_MINUS;
}
else if (i == 0) // if most left term, the sign can be ommited for a '+' sign in front of a number or variable
{
@@ -64,10 +46,24 @@ static term_sign get_sign(token *tokens, int i, int *token_count)
}
else
{
stop_errors(ERROR_TOKEN_POSITION, "at begining of term, we should have a token 'sign', not : '%c' (token number %i)", tokens[i].value_char, i);
stop_errors(ERROR_TOKEN_POSITION, "at begining of term, we should have a token 'sign', not '%s' (token[%i])", token_type_to_str(tokens[i].type), i);
}
return TERM_PLUS; // default, but should not even be reached
return tokens[i].type == TOKEN_SIGN_PLUS ? TERM_PLUS : TERM_MINUS;
}
static double get_double_value(token token)
{
if (token.tag != TOKEN_NUMBER)
{
stop_errors(ERROR_UNKNOWN_TOKEN, "this was suppose to be a number, instead got a %s", token_type_to_str(token.type));
}
if (token.type == TOKEN_NUMBER_DOUBLE)
{
return token.value_double;
}
// else it's an int
return token.value_int;
}
static double get_coefficient(token *tokens, int i, int *token_count)
@@ -104,30 +100,30 @@ static double get_coefficient(token *tokens, int i, int *token_count)
// if coefficient tokens
if (tokens[i].tag == TOKEN_NUMBER)
{
(*token_count)++;
coefficient = tokens[i].value_double;
*token_count = 1;
coefficient = get_double_value(tokens[i]);
}
// detect more coefficients, like "3 * 2 / 5" etc
i++;
while (tokens[i].tag == TOKEN_FACTOR)
{
i++;
if (tokens[i].tag == TOKEN_NUMBER)
{
*token_count += 2;
if (tokens[i - 1].type == TOKEN_FACTOR_MULT)
{
coefficient *= tokens[i].value_double;
}
else if (tokens[i - 1].type == TOKEN_FACTOR_DIV)
{
coefficient /= tokens[i].value_double;
}
}
else
i++; // to check if token after factor is number
if (tokens[i].tag != TOKEN_NUMBER)
{
return coefficient;
}
*token_count += 2;
if (tokens[i - 1].type == TOKEN_FACTOR_MULT)
{
coefficient *= get_double_value(tokens[i]);
}
else if (tokens[i - 1].type == TOKEN_FACTOR_DIV)
{
coefficient /= get_double_value(tokens[i]);
}
i++; // to check if next token is a factor
}
return coefficient;
@@ -193,12 +189,7 @@ static int get_exponent(token *tokens, int i, int *token_count)
}
// then get exponent
if (tokens[i].type == TOKEN_NUMBER_INT)
{
i++;
(*token_count)++;
}
else
if (tokens[i].type != TOKEN_NUMBER_INT)
{
stop_errors(ERROR_TOKEN_POSITION, "at exponent place, we should have an int, but instead got : '%c' (token number %i)", tokens[i].value_char, i);
}
@@ -246,6 +237,8 @@ int parse(token *tokens, term *terms, int terms_count_max)
term_position = TERM_LEFT;
while (tokens[i].type != TOKEN_END && terms_count < terms_count_max)
{
ft_printf("- token[%i]\n", i); // debug
// equal
if (tokens[i].type == TOKEN_EQUAL)
{
@@ -261,21 +254,20 @@ int parse(token *tokens, term *terms, int terms_count_max)
term_sign ret_sign = get_sign(tokens, i, &token_count);
terms[terms_count].sign = ret_sign;
i += token_count;
ft_printf("term[%i] get_sign: (%i)[%s], token_count: [%d]\n", terms_count, ret_sign, term_sign_to_str(ret_sign), token_count);
ft_printf("term[%i] get_sign: (%i)[%s], token_count: [%d]\n", terms_count, ret_sign, term_sign_to_str(ret_sign), token_count); // debug
// coefficient
double ret_coefficient = get_coefficient(tokens, i, &token_count);
terms[terms_count].coefficient = ret_coefficient;
i += token_count;
printf("term[%i] get_coefficient: [%g], token_count: [%d]\n", terms_count, ret_coefficient, token_count);
printf("term[%i] get_coefficient: [%g], token_count: [%d]\n", terms_count, ret_coefficient, token_count); // debug
// exponent
int ret_exponent = get_exponent(tokens, i, &token_count);
terms[terms_count].exponent = ret_exponent;
i += token_count;
ft_printf("term[%i] get_exponent: [%i], token_count: [%d]\n", terms_count, ret_exponent, token_count);
ft_printf("term[%i] get_exponent: [%i], token_count: [%d]\n", terms_count, ret_exponent, token_count); // debug
i++;
terms_count++;
}