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step: add unary operations

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NunoSempere 2023-04-30 11:56:09 -04:00
parent 495418dadc
commit dcfa3c1c99
2 changed files with 31 additions and 12 deletions
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src/mumble.c
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@ -7,6 +7,15 @@
#include "mpc/mpc.h" #include "mpc/mpc.h"
#define VERBOSE 1 #define VERBOSE 1
long evaluate_unary_operation(char* op, long x)
{
if (!strcmp(op, "+")) {
return x;
} else if (!strcmp(op, "-")) {
return -x;
}
return 0;
}
long evaluate_operation(char* op, long x, long y) long evaluate_operation(char* op, long x, long y)
{ {
if (!strcmp(op, "+")) { if (!strcmp(op, "+")) {
@ -17,8 +26,6 @@ long evaluate_operation(char* op, long x, long y)
return x * y; return x * y;
} else if (!strcmp(op, "/")) { } else if (!strcmp(op, "/")) {
return x / y; return x / y;
} else if (!strcmp(op, "^")) {
return 42; // to take care of later
} }
return 0; return 0;
} }
@ -31,8 +38,6 @@ int is_ignorable(mpc_ast_t* t){
long evaluate_ast(mpc_ast_t* t) long evaluate_ast(mpc_ast_t* t)
{ {
// Base case #1: It's a number // Base case #1: It's a number
if (VERBOSE)
printf("\n\nEvaluating the ast");
if (strstr(t->tag, "number")) { if (strstr(t->tag, "number")) {
if (VERBOSE) if (VERBOSE)
printf("\nCase #1, %s", t->contents); printf("\nCase #1, %s", t->contents);
@ -46,6 +51,7 @@ long evaluate_ast(mpc_ast_t* t)
printf("\nCase #2, %s", t->children[0]->contents); printf("\nCase #2, %s", t->children[0]->contents);
return atoi(t->children[0]->contents); return atoi(t->children[0]->contents);
} }
// Base case #3: Top level parenthesis // Base case #3: Top level parenthesis
if (t->children_num == 2 && strstr(t->children[0]->tag, "expr|>") && !strcmp(t->children[1]->tag, "regex")) { if (t->children_num == 2 && strstr(t->children[0]->tag, "expr|>") && !strcmp(t->children[1]->tag, "regex")) {
if (VERBOSE) if (VERBOSE)
@ -53,10 +59,20 @@ long evaluate_ast(mpc_ast_t* t)
return evaluate_ast(t->children[0]); return evaluate_ast(t->children[0]);
} }
// Case #4: Unary operations case // "Real" cases
// Case #5: Binary (or more) operations case
long x; long x;
char* operation; char* operation;
// Case #4: Unary operations case
if (t->children_num == 3 && is_ignorable(t->children[0]) && strstr(t->children[1]->tag, "operator")) {
operation = t->children[1]->contents;
if (VERBOSE)
printf("\nCase #4, unary operation %s", operation);
x = evaluate_ast(t->children[2]);
x = evaluate_unary_operation(operation, x);
}
// Case #5: Binary (or more) operations case
if (t->children_num > 3 && is_ignorable(t->children[0]) && strstr(t->children[1]->tag, "operator")) { if (t->children_num > 3 && is_ignorable(t->children[0]) && strstr(t->children[1]->tag, "operator")) {
operation = t->children[1]->contents; operation = t->children[1]->contents;
if (VERBOSE) if (VERBOSE)
@ -80,13 +96,13 @@ void print_ast(mpc_ast_t* ast, int num_tabs)
for(int i=0; i<num_tabs;i++){ for(int i=0; i<num_tabs;i++){
strcat(tabs, " "); strcat(tabs, " ");
} }
printf("%sTag: %s\n", tabs, ast->tag); printf("\n%sTag: %s", tabs, ast->tag);
printf("%sContents: %s\n", tabs, strcmp(ast->contents, "") ? ast->contents : "None"); printf("\n%sContents: %s", tabs, strcmp(ast->contents, "") ? ast->contents : "None");
printf("%sNumber of children: %i\n", tabs, ast->children_num); printf("\n%sNumber of children: %i", tabs, ast->children_num);
/* Print the children */ /* Print the children */
for (int i = 0; i < ast->children_num; i++) { for (int i = 0; i < ast->children_num; i++) {
mpc_ast_t* child_i = ast->children[i]; mpc_ast_t* child_i = ast->children[i];
printf("%sChild #%d\n", tabs, i); printf("\n%sChild #%d", tabs, i);
print_ast(child_i, 1); print_ast(child_i, 1);
} }
} }
@ -128,7 +144,10 @@ int main(int argc, char** argv)
mpc_ast_t* ast = result.output; mpc_ast_t* ast = result.output;
// Print AST if VERBOSE // Print AST if VERBOSE
print_ast(ast, 0); if(VERBOSE) print_ast(ast, 0);
// Evaluate the AST
if(VERBOSE) printf("\n\nEvaluating the AST");
long result = evaluate_ast(ast); long result = evaluate_ast(ast);
printf("\nResult: %li\n", result); printf("\nResult: %li\n", result);
} else { } else {