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GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
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may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

37
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.POSIX:
.SUFFIXES:
VERSION = 1.0
TARGET = rd
PREFIX ?= /usr/local
BINDIR = $(PREFIX)/bin
CFLAGS = -Os -march=native -mtune=native -pipe -s -std=c99 -pedantic -Wall -D_DEFAULT_SOURCE
SRC != find src -name "*.c"
$(TARGET): $(SRC)
$(CC) $(SRC) -Iinclude -o $@ $(CFLAGS)
dist:
mkdir -p $(TARGET)-$(VERSION)
cp -R README.md $(TARGET) $(TARGET)-$(VERSION)
tar -cf $(TARGET)-$(VERSION).tar $(TARGET)-$(VERSION)
gzip $(TARGET)-$(VERSION).tar
rm -rf $(TARGET)-$(VERSION)
install: $(TARGET)
mkdir -p $(DESTDIR)$(BINDIR)
mkdir -p $(DESTDIR)$(MANDIR)
cp -p $(TARGET) $(DESTDIR)$(BINDIR)/$(TARGET)
chmod 755 $(DESTDIR)$(BINDIR)/$(TARGET)
uninstall:
rm $(DESTDIR)$(BINDIR)/$(TARGET)
clean:
rm $(TARGET)
all: $(TARGET)
.PHONY: all dist install uninstall clean

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# Radish
Programming language.
# Usage
```sh
rd run # interpreter
rd build # compiler
rd add # dependency manager
rd test # test suite
rd ci # ci
rd lsp # lsp server
rd packager # create package
```
# Depedencies
None
# Building
You will need to run these with elevated privilages.
```
$ make
# make install
```
# Contributions
Contributions are welcomed, feel free to open a pull request.
# License
This project is licensed under the GNU Public License v3.0. See [LICENSE](https://github.com/night0721/radish/blob/master/LICENSE) for more information.

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#ifndef AST_H
#define AST_H
#include "lexer.h"
/*
expression → literal
| unary
| binary
| grouping ;
literal → NUMBER | STRING | "true" | "false" | "nil" ;
grouping → "(" expression ")" ;
unary → ( "-" | "!" ) expression ;
binary → expression operator expression ;
operator → "==" | "!=" | "<" | "<=" | ">" | ">="
| "+" | "-" | "*" | "/" ;
*/
typedef enum {
BINARY,
UNARY,
LITERAL,
GROUPING,
} expr_type;
typedef enum {
VAL_BOOL,
VAL_NIL,
VAL_NUMBER,
VAL_STRING,
} value_type_t;
typedef struct {
value_type_t type;
union {
int boolean;
double number;
char *string;
} as;
} value_t;
typedef struct expr_t {
expr_type type;
int line;
union {
struct {
token_t binary_op;
struct expr_t *left;
struct expr_t *right;
} binary;
struct {
token_t unary_op;
struct expr_t *right;
} unary;
struct {
value_t value;
} literal;
struct {
struct expr_t *expression;
} grouping;
} as;
} expr_t;
expr_t *create_binary_expr(token_t *binary_op, expr_t *left, expr_t *right);
expr_t *create_unary_expr(token_t *unary_op, expr_t *right);
expr_t *create_literal_expr(token_t *token);
expr_t *create_grouping_expr(expr_t *expression);
void print_ast(expr_t *expr);
#endif

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#ifndef INTERPRETER_H
#define INTERPRETER_H
#include "ast.h"
value_t evaluate(expr_t *expr);
void print_value(value_t *value);
#endif

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#ifndef LEXER_H
#define LEXER_H
#define DEFAULT_TOKENS_SIZE 512
typedef enum {
// Single-character tokens
LEFT_PAREN, RIGHT_PAREN, LEFT_BRACE, RIGHT_BRACE,
COMMA, DOT, MINUS, PLUS, SEMICOLON, SLASH, STAR,
// One or two character tokens
BANG, BANG_EQUAL,
EQUAL, EQUAL_EQUAL,
GREATER, GREATER_EQUAL,
LESS, LESS_EQUAL,
// Literals
IDENTIFIER, STRING, NUMBER,
// Keywords
AND, CLASS, ELSE, FALSE, FUN, FOR, IF, NIL, OR,
PRINT, RETURN, SUPER, THIS, TRUE, VAR, WHILE,
END_OF_FILE
} token_type_t;
typedef struct {
char *keyword;
token_type_t token_type;
} keyword_map;
typedef struct {
token_type_t type;
char *value;
int line;
} token_t;
typedef struct {
token_t *tokens;
int length;
int capacity;
} array_t;
array_t *tokenize(char *filename);
void print_tokens(token_t *tokens);
void free_array(array_t *array);
#endif

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#ifndef PARSER_H
#define PARSER_H
/*
expression → equality ;
equality → comparison ( ( "!=" | "==" ) comparison )* ;
comparison → term ( ( ">" | ">=" | "<" | "<=" ) term )* ;
term → factor ( ( "-" | "+" ) factor )* ;
factor → unary ( ( "/" | "*" ) unary )* ;
unary → ( "!" | "-" ) unary
| primary ;
primary → NUMBER | STRING | "true" | "false" | "nil"
| "(" expression ")" ;
*/
#include "ast.h"
#include "lexer.h"
expr_t *parse(token_t *tks);
void free_expr(expr_t *expr);
#endif

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#ifndef STMT_H
#define STMT_H
#include "ast.h"
#include "scanner.h"
typedef enum {
STMT_BLOCK,
STMT_CLASS,
STMT_EXPR,
STMT_FUN,
STMT_IF,
STMT_PRINT,
STMT_VAR,
STMT_WHILE,
STMT_COUNT,
} StmtType;
typedef struct Stmt Stmt;
struct Stmt{
StmtType type;
union {
struct {
Stmt **statements;
} block;
struct {
Token name;
Token superclass;
Stmt **methods;
} class;
struct {
Expr *expression;
} expr;
struct {
Token name;
TokenArray params;
Stmt **body;
} function;
struct {
Expr *condition;
Stmt *thenBranch;
Stmt *elseBranch;
} _if;
struct {
Expr *expression;
} print;
struct {
Token keyword;
Expr *value;
} _return;
struct {
Token name;
Expr *initializer;
} variable;
struct {
Expr *condition;
Stmt *body;
} _while;
} as;
};
typedef struct {
Stmt *statements;
int count;
int capacity;
bool hadError;
} StmtArray;
#endif

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "ast.h"
#include "lexer.h"
expr_t *create_binary_expr(token_t *binary_op, expr_t *left, expr_t *right)
{
expr_t *expr = malloc(sizeof(expr_t));
expr->type = BINARY;
expr->line = binary_op->line;
expr->as.binary.left = left;
expr->as.binary.right = right;
expr->as.binary.binary_op.type = binary_op->type;
char *bin_op_val = strdup(binary_op->value);
expr->as.binary.binary_op.value = bin_op_val;
expr->as.binary.binary_op.line = binary_op->line;
return expr;
}
expr_t *create_unary_expr(token_t *unary_op, expr_t *right)
{
expr_t *expr = malloc(sizeof(expr_t));
expr->type = UNARY;
expr->line = unary_op->line;
expr->as.unary.unary_op.type = unary_op->type;
char *u_op_val = strdup(unary_op->value);
expr->as.unary.unary_op.value = u_op_val;
expr->as.unary.unary_op.line = unary_op->line;
expr->as.unary.right = right;
return expr;
}
expr_t *create_literal_expr(token_t *token)
{
expr_t *expr = malloc(sizeof(expr_t));
expr->type = LITERAL;
expr->line = token->line;
switch (token->type) {
case NUMBER:
expr->as.literal.value.type = VAL_NUMBER;
double num;
sscanf(token->value, "%lf", &num);
expr->as.literal.value.as.number = num;
break;
case NIL:
expr->as.literal.value.type = VAL_NIL;
expr->as.literal.value.as.number = 0;
break;
case TRUE:
case FALSE:
expr->as.literal.value.type = VAL_BOOL;
expr->as.literal.value.as.boolean = token->type == TRUE;
break;
case STRING:
expr->as.literal.value.type = VAL_STRING;
char *tkvalue = strdup(token->value);
expr->as.literal.value.as.string = tkvalue;
break;
default:
break;
}
return expr;
}
expr_t *create_grouping_expr(expr_t *expression)
{
if (!expression) {
return NULL;
}
expr_t *expr = malloc(sizeof(expr_t));
expr->type = GROUPING;
expr->line = expression->line;
expr->as.grouping.expression = expression;
return expr;
}
void print_ast(expr_t *expr)
{
if (!expr)
return;
if (expr->type == LITERAL) {
switch (expr->as.literal.value.type) {
case VAL_BOOL:
printf("%s", expr->as.literal.value.as.boolean ? "true" : "false");
break;
case VAL_NIL:
printf("nil");
break;
case VAL_NUMBER:;
double value = expr->as.literal.value.as.number;
if (value == (int) value) {
printf("%.1f", value);
} else {
printf("%g", value);
}
break;
case VAL_STRING:
printf("%s", expr->as.literal.value.as.string);
break;
}
} else if (expr->type == BINARY) {
printf("(%s ", expr->as.binary.binary_op.value);
print_ast(expr->as.binary.left);
printf(" ");
print_ast(expr->as.binary.right);
printf(")");
} else if (expr->type == UNARY) {
printf("(%s ", expr->as.unary.unary_op.value);
print_ast(expr->as.unary.right);
printf(")");
} else if (expr->type == GROUPING) {
printf("(group ");
print_ast(expr->as.grouping.expression);
printf(")");
}
}

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "ast.h"
#include "interpreter.h"
#include "lexer.h"
value_t visit_literal(expr_t *expr);
value_t visit_grouping(expr_t *expr);
value_t visit_binary(expr_t *expr);
value_t visit_unary(expr_t *expr);
value_t visit_literal(expr_t *expr)
{
return expr->as.literal.value;
}
value_t visit_grouping(expr_t *expr)
{
return evaluate(expr->as.grouping.expression);
}
void runtime_error(const char *message, int line)
{
fprintf(stderr, "%s\n[line %d]\n", message, line);
errno = 70;
exit(70);
}
value_t visit_binary(expr_t *expr)
{
token_type_t op_type = expr->as.binary.binary_op.type;
value_t right = evaluate(expr->as.binary.right);
value_t left = evaluate(expr->as.binary.left);
// Arithmetic
if (left.type == VAL_NUMBER && right.type == VAL_NUMBER) {
value_t result = {.type = VAL_NUMBER};
switch (op_type) {
case PLUS:
result.as.number = left.as.number + right.as.number;
return result;
case MINUS:
result.as.number = left.as.number - right.as.number;
return result;
case STAR:
result.as.number = left.as.number * right.as.number;
return result;
case SLASH:
if (right.as.number == 0) {
runtime_error("Division by zero.", expr->line);
}
result.as.number = left.as.number / right.as.number;
return result;
default:
break;
}
}
// Comparison
if (op_type == EQUAL_EQUAL || op_type == BANG_EQUAL) {
int is_equal;
if (left.type != right.type) {
is_equal = 0;
} else {
switch (left.type) {
case VAL_NUMBER:
is_equal = left.as.number == right.as.number;
break;
case VAL_BOOL:
is_equal = left.as.boolean == right.as.boolean;
break;
case VAL_STRING:
is_equal = strcmp(left.as.string, right.as.string) == 0;
break;
case VAL_NIL:
is_equal = 1; // nil == nil
break;
default:
is_equal = 0;
break;
}
}
value_t result = {.type = VAL_BOOL};
result.as.boolean = op_type == EQUAL_EQUAL ? is_equal : !is_equal;
return result;
}
// Number Comparison
if (left.type == VAL_NUMBER && right.type == VAL_NUMBER) {
value_t result = {.type = VAL_BOOL };
switch (op_type) {
case GREATER:
result.as.boolean= left.as.number > right.as.number;
return result;
case GREATER_EQUAL:
result.as.boolean = left.as.number >= right.as.number;
return result;
case LESS:
result.as.boolean = left.as.number < right.as.number;
return result;
case LESS_EQUAL:
result.as.boolean = left.as.number <= right.as.number;
return result;
default: break;
}
}
// String concatenation
if (left.type == VAL_STRING && right.type == VAL_STRING) {
if (op_type == PLUS) {
value_t result = {.type = VAL_STRING};
size_t left_len = strlen(left.as.string);
size_t right_len = strlen(right.as.string);
result.as.string = malloc(left_len + right_len + 1);
strcpy(result.as.string, left.as.string);
strcat(result.as.string, right.as.string);
return result;
}
}
// String/number comparisons
if ((left.type == VAL_STRING && right.type == VAL_NUMBER) || (left.type == VAL_NUMBER && right.type == VAL_STRING)) {
runtime_error("Operands must be numbers.", expr->line);
}
runtime_error("Operands must be two numbers or two strings.", expr->line);
return (value_t){.type = VAL_NIL};
}
int is_truthy(value_t *value)
{
switch (value->type) {
case VAL_NIL:
return 0;
case VAL_BOOL:
return value->as.boolean;
case VAL_NUMBER:
if (value->as.number == 0)
return 0;
return 1;
case VAL_STRING:
return 1;
default:
return 0;
}
}
value_t visit_unary(expr_t *expr)
{
value_t operand = evaluate(expr->as.unary.right);
if (expr->as.unary.unary_op.type == MINUS) {
if (operand.type == VAL_NUMBER) {
value_t result = {.type = VAL_NUMBER, .as.number = -operand.as.number};
return result;
} else {
runtime_error("Operand must be a number.", expr->line);
}
} else if (expr->as.unary.unary_op.type == BANG) {
value_t result = {.type = VAL_BOOL, .as.boolean = !is_truthy(&operand)};
return result;
}
return (value_t){.type = VAL_NIL};
}
value_t evaluate(expr_t *expr)
{
if (!expr) {
value_t nil_value = {.type = VAL_NIL };
return nil_value;
}
switch (expr->type) {
case LITERAL:
return visit_literal(expr);
case BINARY:
return visit_binary(expr);
case UNARY:
return visit_unary(expr);
case GROUPING:
return visit_grouping(expr);
default:
errno = 65;
break;
}
}
void print_value(value_t *value)
{
switch (value->type) {
case VAL_BOOL:
printf("%s\n", value->as.boolean == 1 ? "true" : "false");
break;
case VAL_NIL:
printf("nil\n");
break;
case VAL_STRING:
printf("%s\n", value->as.string);
break;
case VAL_NUMBER:
if (value->as.number == (int) value->as.number) {
printf("%d\n", (int) value->as.number);
} else {
printf("%g\n", value->as.number);
}
break;
default:
break;
}
}

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include "lexer.h"
const keyword_map reserved_keywords[] = {
{"and", AND}, {"class", CLASS}, {"else", ELSE},
{"false", FALSE}, {"fun", FUN}, {"for", FOR},
{"if", IF}, {"nil", NIL}, {"or", OR},
{"print", PRINT}, {"return", RETURN},
{"super", SUPER}, {"this", THIS}, {"true", TRUE},
{"var", VAR}, {"while", WHILE}
};
const keyword_map regular_tokens[] = {
{"LEFT_PAREN", LEFT_PAREN}, {"RIGHT_PAREN", RIGHT_PAREN},
{"LEFT_BRACE", LEFT_BRACE}, {"RIGHT_BRACE", RIGHT_BRACE},
{"COMMA", COMMA}, {"DOT", DOT}, {"MINUS", MINUS},
{"PLUS", PLUS}, {"SEMICOLON", SEMICOLON}, {"SLASH", SLASH},
{"STAR", STAR}, {"BANG", BANG}, {"BANG_EQUAL", BANG_EQUAL},
{"EQUAL", EQUAL}, {"EQUAL_EQUAL", EQUAL_EQUAL}, {"GREATER", GREATER},
{"GREATER_EQUAL", GREATER_EQUAL}, {"LESS", LESS}, {"LESS_EQUAL", LESS_EQUAL},
{"IDENTIFIER", IDENTIFIER}, {"STRING", STRING}, {"NUMBER", NUMBER},
{"AND", AND}, {"CLASS", CLASS}, {"ELSE", ELSE}, {"FALSE", FALSE},
{"FUN", FUN}, {"FOR", FOR}, {"IF", IF}, {"NIL", NIL},
{"OR", OR}, {"PRINT", PRINT}, {"RETURN", RETURN},
{"SUPER", SUPER}, {"THIS", THIS}, {"TRUE", TRUE},
{"VAR", VAR}, {"WHILE", WHILE}, {"END_OF_FILE", END_OF_FILE}
};
char *read_source(const char *filename)
{
FILE *file = fopen(filename, "r");
if (file == NULL) {
fprintf(stderr, "rd: Error reading file: %s\n", filename);
return NULL;
}
fseek(file, 0, SEEK_END);
long file_size = ftell(file);
rewind(file);
char *source = malloc(file_size + 1);
if (source == NULL) {
fprintf(stderr, "rd: Error allocating memory\n");
fclose(file);
return NULL;
}
size_t bytes_read = fread(source, 1, file_size, file);
if (bytes_read < file_size) {
fprintf(stderr, "rd: Error reading file contents\n");
free(source);
fclose(file);
return NULL;
}
source[file_size] = '\0';
fclose(file);
return source;
}
int is_digit(char c)
{
return c >= '0' && c <= '9';
}
int is_alpha(char c)
{
return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c == '_';
}
void token_add(array_t *array, token_t token)
{
if (array->length == array->capacity) {
array->capacity *= 2;
array->tokens = realloc(array->tokens, array->capacity * sizeof(token_t));
}
array->tokens[array->length++] = token;
}
token_t token_gen(token_type_t type, char *value, int line)
{
token_t token;
token.type = type;
char *val = strdup(value);
token.value = val;
token.line = line;
return token;
}
char *type_str(token_type_t type)
{
for (int i = 0; i < sizeof(regular_tokens) / sizeof(regular_tokens[0]); i++) {
if (regular_tokens[i].token_type == type) {
return regular_tokens[i].keyword;
}
}
return NULL;
}
void print_tokens(token_t *tokens)
{
for (int i = 0; tokens[i].type != END_OF_FILE; i++) {
token_t token = tokens[i];
if (token.type == STRING) {
printf("STRING \"%s\" %s\n", token.value, token.value);
} else if (token.type == NUMBER) {
double value = strtod(token.value, NULL);
if (value == (int) value) {
printf("NUMBER %s %d.0\n", token.value, (int) value);
} else {
printf("NUMBER %s %g\n", token.value, value);
}
} else {
printf("%s %s null\n", type_str(token.type), token.value);
}
}
printf("EOF null\n");
}
void free_array(array_t *array)
{
for (int i = 0; i < array->length; i++) {
if (array->tokens[i].value) {
free(array->tokens[i].value);
}
}
free(array->tokens);
free(array);
}
array_t *tokenize(char *filename)
{
array_t *tokens = malloc(sizeof(array_t));
tokens->tokens = malloc(DEFAULT_TOKENS_SIZE * sizeof(token_t));
tokens->length = 0;
tokens->capacity = DEFAULT_TOKENS_SIZE;
char *source = read_source(filename);
if (!source) {
return NULL;
}
int line = 1;
size_t source_len = strlen(source);
if (source_len > 0) {
for (int i = 0; i < source_len; i++) {
switch (source[i]) {
case '(':
token_add(tokens, token_gen(LEFT_PAREN, "(", line));
break;
case ')':
token_add(tokens, token_gen(RIGHT_PAREN, ")", line));
break;
case '{':
token_add(tokens, token_gen(LEFT_BRACE, "{", line));
break;
case '}':
token_add(tokens, token_gen(RIGHT_BRACE, "}", line));
break;
case '*':
token_add(tokens, token_gen(STAR, "*", line));
break;
case '.':
token_add(tokens, token_gen(DOT, ".", line));
break;
case ',':
token_add(tokens, token_gen(COMMA, ",", line));
break;
case '+':
token_add(tokens, token_gen(PLUS, "+", line));
break;
case '-':
token_add(tokens, token_gen(MINUS, "-", line));
break;
case ';':
token_add(tokens, token_gen(SEMICOLON, ";", line));
break;
case '=':
if (source[i + 1] == '=') {
token_add(tokens, token_gen(EQUAL_EQUAL, "==", line));
i++;
} else {
token_add(tokens, token_gen(EQUAL, "=", line));
}
break;
case '!':
if (source[i + 1] == '=') {
token_add(tokens, token_gen(BANG_EQUAL, "!=", line));
i++;
} else {
token_add(tokens, token_gen(BANG, "!", line));
}
break;
case '>':
if (source[i + 1] == '=') {
token_add(tokens, token_gen(GREATER_EQUAL, ">=", line));
i++;
} else {
token_add(tokens, token_gen(GREATER, ">", line));
}
break;
case '<':
if (source[i + 1] == '=') {
token_add(tokens, token_gen(LESS_EQUAL, "<=", line));
i++;
} else {
token_add(tokens, token_gen(LESS, "<", line));
}
break;
case '/':
if (source[i + 1] == '/') {
i += 2; // Skip both forward slashes
while (i < strlen(source) && source[i] != '\n') {
i++;
}
i--;
} else {
token_add(tokens, token_gen(SLASH, "/", line));
}
break;
case ' ':
break;
case '\t':
break;
case '\n':
line++;
break;
case '"':
i++;
int str_start = i;
while (source[i] != '"' && source[i] != '\0') {
if (source[i] == '\n')
line++;
i++;
}
if (source[i] == '\0') {
fprintf(stderr, "[line %d] Error: Unterminated string.\n", line);
errno = 65;
} else {
int len = i - str_start;
char str[len + 1];
strncpy(str, &source[str_start], len);
str[len] = 0;
token_add(tokens, token_gen(STRING, str, line));
}
break;
default:
if (is_alpha(source[i])) {
int id_start = i;
while (source[i] == '_' || (source[i] >= 'a' && source[i] <= 'z') ||
(source[i] >= 'A' && source[i] <= 'Z') ||
(source[i] >= '0' && source[i] <= '9')) {
i++;
}
int len = i - id_start;
char id[len + 1];
strncpy(id, &source[i-len], len);
id[len] = 0;
int found = 0;
for (int i = 0; i < sizeof(reserved_keywords) / sizeof(reserved_keywords[0]); i++) {
if (strcmp(id, reserved_keywords[i].keyword) == 0) {
char upper_id[len + 1];
for (int i = 0; i < len; i++) {
upper_id[i] = toupper(id[i]);
}
upper_id[len] = 0;
token_add(tokens, token_gen(reserved_keywords[i].token_type, id, line));
found = 1;
}
}
if (!found) {
token_add(tokens, token_gen(IDENTIFIER, id, line));
}
i--;
break;
} else if (is_digit(source[i])) {
int int_start = i;
while (isdigit(source[i]))
i++;
if (source[i] == '.' && isdigit(source[i + 1])) {
i++;
while (isdigit(source[i]))
i++;
}
int len = i - int_start;
char *iend = source + int_start;
char integer[len + 1];
strncpy(integer, iend, len);
integer[len] = 0;
token_add(tokens, token_gen(NUMBER, integer, line));
i--;
} else {
fprintf(stderr, "[line %d] Error: Unexpected character: %c\n", line, source[i]);
errno = 65;
}
}
}
}
token_add(tokens, token_gen(END_OF_FILE, "EOF", line));
free(source);
return tokens;
}

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#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include "ast.h"
#include "lexer.h"
#include "parser.h"
int current = 0;
token_t *tokens;
expr_t *expression(void);
void error(token_t *token, char *message)
{
if (token->type == END_OF_FILE) {
fprintf(stderr, "[line %d] at end: %s\n", token->line, message);
} else {
fprintf(stderr, "[line %d] at '%s': %s\n", token->line, token->value, message);
}
errno = 65;
}
void free_expr(expr_t *expr)
{
if (!expr)
return;
switch (expr->type) {
case BINARY:
free(expr->as.binary.binary_op.value);
free_expr(expr->as.binary.left);
free_expr(expr->as.binary.right);
free(expr);
break;
case GROUPING:
free_expr(expr->as.grouping.expression);
free(expr);
break;
case UNARY:
free(expr->as.unary.unary_op.value);
free_expr(expr->as.unary.right);
free(expr);
break;
case LITERAL:
if (expr->as.literal.value.type == VAL_STRING) {
free(expr->as.literal.value.as.string);
}
free(expr);
break;
default:
break;
}
}
expr_t *parse(token_t *tks)
{
tokens = tks;
if (errno == 65) {
return NULL;
} else {
return expression();
}
}
token_t *peek(void)
{
return &tokens[current];
}
int isAtEnd(void)
{
return tokens[current].type == END_OF_FILE;
}
token_t *previous(void)
{
return &tokens[current - 1];
}
void advance(void)
{
if (!isAtEnd())
current++;
}
int check(token_type_t type)
{
if (tokens[current].type == type) {
advance();
return 1;
} else {
return 0;
}
}
void consume(token_type_t type, char *message) {
if (!check(type)) {
error(peek(), message);
}
}
expr_t *primary(void)
{
if (check(FALSE) || check(TRUE) || check(NIL) || check(NUMBER) || check(STRING)) {
return create_literal_expr(previous());
}
if (check(LEFT_PAREN)) {
expr_t *expr = expression();
consume(RIGHT_PAREN, "Expect ')' after expression.");
return create_grouping_expr(expr);
}
error(peek(), "Expect expression.");
return NULL;
}
expr_t *unary(void)
{
if (check(BANG) || check(MINUS)) {
token_t *operator = previous();
expr_t *right = unary();
return create_unary_expr(operator, right);
}
return primary();
}
expr_t *factor(void)
{
expr_t *expr = unary();
while (check(SLASH) || check(STAR)) {
token_t *operator = previous();
expr_t *right = unary();
expr = create_binary_expr(operator, expr, right);
}
return expr;
}
expr_t *term(void)
{
expr_t *expr = factor();
while (check(MINUS) || check(PLUS)) {
token_t *operator = previous();
expr_t *right = factor();
expr = create_binary_expr(operator, expr, right);
}
return expr;
}
expr_t *comparison(void)
{
expr_t *expr = term();
while (check(GREATER) || check(GREATER_EQUAL) || check(LESS) || check(LESS_EQUAL)) {
token_t *operator = previous();
expr_t *right = term();
expr = create_binary_expr(operator, expr, right);
}
return expr;
}
expr_t *equality(void)
{
expr_t *expr = comparison();
while (check(BANG_EQUAL) || check(EQUAL_EQUAL)) {
token_t *operator = previous();
expr_t *right = comparison();
expr = create_binary_expr(operator, expr, right);
}
return expr;
}
expr_t *expression(void)
{
return equality();
}
void synchronize(void)
{
advance();
while (!isAtEnd()) {
if (previous()->type == SEMICOLON) return;
switch (peek()->type) {
case CLASS:
case FUN:
case VAR:
case FOR:
case IF:
case WHILE:
case PRINT:
case RETURN:
return;
default:
return;
}
advance();
}
}

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "ast.h"
#include "interpreter.h"
#include "lexer.h"
#include "parser.h"
int main(int argc, char **argv)
{
if (argc < 3) {
fprintf(stderr, "Usage: rd tokenize|parse|evaluate <filename>\n");
return 1;
}
const char *command = argv[1];
if (!strcmp(command, "tokenize")) {
array_t *array = tokenize(argv[2]);
if (array) {
print_tokens(array->tokens);
free_array(array);
}
} else if (!strcmp(command, "parse")) {
array_t *array = tokenize(argv[2]);
expr_t *expr = parse(array->tokens);
if (errno != 65) {
print_ast(expr);
printf("\n");
}
free_array(array);
free_expr(expr);
} else if (!strcmp(command, "evaluate")) {
array_t *array = tokenize(argv[2]);
expr_t *expr = parse(array->tokens);
value_t val = evaluate(expr);
print_value(&val);
} else {
fprintf(stderr, "Unknown command: %s\n", command);
return 1;
}
if (errno == 65) {
return 65;
} else if (errno == 70) {
return 70;
}
return 0;
}