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Added a shell when no arguments are given to sloth.

Now has a new dependencies on editline library.
This commit is contained in:
Brandon Rozek 2018-09-26 12:47:43 -04:00
parent f3e04ac019
commit 1186419184
5 changed files with 104 additions and 8 deletions

1
.gitignore vendored
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@ -8,6 +8,7 @@ src/variables/variable.o
src/variables/value.o src/variables/value.o
src/operations/node.o src/operations/node.o
src/operations/operators.o src/operations/operators.o
src/shell.o
sloth sloth
vgcore* vgcore*
.vscode .vscode

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@ -1,5 +1,5 @@
sloth: src/main.c src/parser/lex.yy.o src/parser/parser.tab.o src/variables/environment.o src/variables/variable.o src/variables/value.o src/operations/node.o src/operations/operators.o sloth: src/main.c src/parser/lex.yy.o src/parser/parser.tab.o src/variables/environment.o src/variables/variable.o src/variables/value.o src/operations/node.o src/operations/operators.o src/shell.o
gcc src/main.c src/parser/lex.yy.o src/parser/parser.tab.o src/variables/environment.o src/variables/variable.o src/variables/value.o src/operations/node.o src/operations/operators.o -o sloth gcc src/main.c src/parser/lex.yy.o src/parser/parser.tab.o src/variables/environment.o src/variables/variable.o src/variables/value.o src/operations/node.o src/operations/operators.o src/shell.o -ledit -o sloth
src/parser/lex.yy.o: src/parser/lex.yy.c src/parser/parser.tab.h src/parser/lex.yy.o: src/parser/lex.yy.c src/parser/parser.tab.h
gcc -c src/parser/lex.yy.c -o src/parser/lex.yy.o gcc -c src/parser/lex.yy.c -o src/parser/lex.yy.o
src/parser/parser.tab.o: src/parser/parser.tab.c src/parser/parser.tab.o: src/parser/parser.tab.c
@ -20,5 +20,7 @@ src/operations/operators.o: src/operations/operators.h src/operations/operators
gcc -c src/operations/operators.c -o src/operations/operators.o gcc -c src/operations/operators.c -o src/operations/operators.o
src/operations/node.o: src/operations/node.h src/operations/node.c src/operations/node.o: src/operations/node.h src/operations/node.c
gcc -c src/operations/node.c -o src/operations/node.o gcc -c src/operations/node.c -o src/operations/node.o
src/shell.o: src/shell.h src/shell.c
gcc -c src/shell.c -o src/shell.o
clean: clean:
rm src/parser/lex.yy.c src/parser/parser.tab.c src/parser/parser.tab.h src/parser/lex.yy.o src/parser/parser.tab.o src/variables/environment.o src/variables/variable.o src/variables/value.o src/operations/node.o src/operations/operators.o sloth rm src/parser/lex.yy.c src/parser/parser.tab.c src/parser/parser.tab.h src/parser/lex.yy.o src/parser/parser.tab.o src/variables/environment.o src/variables/variable.o src/variables/value.o src/operations/node.o src/operations/operators.o src/shell.o sloth

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@ -1,19 +1,31 @@
#include <stdio.h> #include <stdio.h>
#include <stdlib.h> #include <stdlib.h>
#include "sloth.h" #include "sloth.h"
#include "shell.h"
void interpret_file(char* fileName);
/* the result variable */ /* the result variable */
struct Node* result; struct Node* result;
int main(int argc, char* argv[]) { int main(int argc, char* argv[]) {
if (argc != 2) { if (argc == 1) {
printf("Incorrect number of arguments passed. Expected %d, got %d.\n", 1, argc - 1); start_shell();
} else if (argc == 2) {
interpret_file(argv[1]);
} else {
printf("Incorrect number of arguments passed. Expected %d or %d, got %d.\n", 0, 1, argc - 1);
printf("Usage: lexer [program_name].sl\n"); printf("Usage: lexer [program_name].sl\n");
exit(-1); exit(-1);
} }
}
void interpret_file(char* fileName) {
/* save stdin */ /* save stdin */
FILE* orig_stdin = stdin; FILE* orig_stdin = stdin;
stdin = fopen(argv[1], "r"); stdin = fopen(fileName, "r");
yyparse( ); yyparse( );
@ -27,5 +39,4 @@ int main(int argc, char* argv[]) {
eval_statement(result, env); eval_statement(result, env);
delete_environment(env); delete_environment(env);
delete_tree(result); delete_tree(result);
return 0; }
}

75
src/shell.c Normal file
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@ -0,0 +1,75 @@
#include <stdio.h>
#include <string.h>
#include "shell.h"
#include "variables/environment.h"
#include "operations/node.h"
// For keeping track of command history
#ifdef _WIN32 // If we're compiling on windows
#include <string.h>
static char buffer[2048];
// Fake readline function
char* readline(char* prompt) {
fputs(prompt, stdout);
fgets(buffer, 2048, stdin);
char* cpy = malloc(strlen(buffer) + 1);
strcpy(cpy, buffer);
cpy[strlen(cpy) - 1] = '\0';
return cpy;
}
void add_history(char* unused) {}
#else // Otherwise we'll just use the handy readline library
#include <editline/readline.h>
#endif
struct Node* result;
FILE* stringToFile(char* str) { // Creates a temporary file with the given string as its contents
int i = 0;
FILE* tmp = tmpfile();
if (tmp == NULL) {
fprintf(stderr, "Unable to create temp file");
return NULL;
}
while (str[i] != '\0') {
fputc(str[i], tmp); i++;
}
// Set the file pointer to the beginning
rewind(tmp);
return tmp;
}
void start_shell() {
printf("Welcome to SLOTH Version 0.0.1\n");
printf("Press CTRL+C to Exit\n");
struct Environment* env = create_environment();
while (1) {
// Read line from user and input it into the history
char* input = readline("sloth> ");
add_history(input);
// If user enters "exit" quit the loop
if (strcmp(input, "exit") == 0) { break; }
FILE* inputAsFile = stringToFile(input);
/* save stdin */
FILE* orig_stdin = stdin;
stdin = inputAsFile;
yyparse( );
/* restore stdin */
fclose(stdin);
stdin = orig_stdin;
eval_statement(result, env);
}
delete_environment(env);
delete_tree(result);
}

7
src/shell.h Normal file
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@ -0,0 +1,7 @@
#ifndef SHELL_H
#define SHELL_H
FILE* stringToFile(char* str);
void start_shell();
#endif