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Added a limit to string and identifier lengths

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Kayne Ruse
2022-08-15 02:53:30 +01:00
parent 9e899f5974
commit 4cda75df11
2 changed files with 31 additions and 5 deletions
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3
scripts/small.toy
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@@ -1,2 +1 @@
;

33
source/parser.c
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@@ -6,6 +6,8 @@
#include "literal.h"
#include "opcodes.h"
#include "console_colors.h"
#include <stdio.h>
//utility functions
@@ -235,9 +237,18 @@ static Opcode compound(Parser* parser, Node** nodeHandle, bool canBeAssigned) {
static Opcode string(Parser* parser, Node** nodeHandle, bool canBeAssigned) {
//handle strings
switch(parser->previous.type) {
case TOKEN_LITERAL_STRING:
emitNodeLiteral(nodeHandle, TO_STRING_LITERAL(copyString(parser->previous.lexeme, parser->previous.length)));
case TOKEN_LITERAL_STRING: {
int length = parser->previous.length;
//for safety
if (length > 4096) {
length = 4096;
error(parser, parser->previous, "Strings can only be a maximum of 4096 characters long");
}
emitNodeLiteral(nodeHandle, TO_STRING_LITERAL(copyString(parser->previous.lexeme, length)));
return OP_EOF;
}
//TODO: interpolated strings
@@ -396,7 +407,16 @@ static Opcode atomic(Parser* parser, Node** nodeHandle, bool canBeAssigned) {
static Opcode identifier(Parser* parser, Node** nodeHandle, bool canBeAssigned) {
//make a copy of the string
Token identifierToken = parser->previous;
char* cpy = copyString(identifierToken.lexeme, identifierToken.length);
int length = identifierToken.length;
//for safety
if (length > 256) {
length = 256;
error(parser, parser->previous, "Identifiers can only be a maximum of 256 characters long");
}
char* cpy = copyString(identifierToken.lexeme, length);
Literal identifier = _toIdentifierLiteral(cpy, strlen(cpy)); //BUGFIX: use this instead of the macro
emitNodeLiteral(nodeHandle, identifier);
@@ -732,6 +752,13 @@ static void assertStmt(Parser* parser, Node** nodeHandle) {
//precedence functions
static void expressionStmt(Parser* parser, Node** nodeHandle) {
//BUGFIX: check for empty statements
if (match(parser, TOKEN_SEMICOLON)) {
(*nodeHandle)->type = NODE_LITERAL;
(*nodeHandle)->atomic.literal = TO_NULL_LITERAL;
return;
}
//BUGFIX: statements assume the node exists, expressions assume it doens't
Node* ptr = NULL;
expression(parser, &ptr);