parse: add some more generic token parser functions

bshell/parse/syntax/generic.c

@@ -126,6 +126,36 @@ bool parse_keyword(struct parse_ctx *ctx, enum token_keyword kw)
 	return true;
 }
 
+bool parse_word(struct parse_ctx *ctx, struct lex_token **out)
+{
+	struct lex_token *tok = peek_token(ctx);
+	if (!tok) {
+		return false;
+	}
+
+	if (tok->tok_type != TOK_WORD) {
+		return false;
+	}
+
+	*out = claim_token(ctx);
+	return true;
+}
+
+bool parse_var(struct parse_ctx *ctx, struct lex_token **out)
+{
+	struct lex_token *tok = peek_token(ctx);
+	if (!tok) {
+		return false;
+	}
+
+	if (tok->tok_type != TOK_VAR) {
+		return false;
+	}
+
+	*out = claim_token(ctx);
+	return true;
+}
+
 bool parse_int(struct parse_ctx *ctx, long long *out)
 {
 	struct lex_token *tok = peek_token(ctx);