1 files changed, 126 insertions, 0 deletions
diff --git a/src/tests/lexer.c b/src/tests/lexer.c
new file mode 100644
index 0000000..3700ae6
--- /dev/null
+++ b/src/tests/lexer.c
@@ -0,0 +1,126 @@
+#include "tests/tests.h"
+#include "lexer.h"
+
+#include <string.h>
+
+#include "slice.h"
+#include "token.h"
+
+static void
+test_next_token(void)
+{
+	char *input = "let five = 5;\n"
+				  "let ten = 10;\n"
+				  "\n"
+				  "let add = fn(x, y) {\n"
+				  "\tx + y;\n"
+				  "};\n"
+				  "\n"
+				  "let result = add(five, ten);"
+				  "!-/*5;\n"
+				  "5 < 10 > 5;\n"
+				  "\n"
+				  "if (5 < 10) {\n"
+				  "\treturn true;\n"
+				  "} else {\n"
+				  "\treturn false;\n"
+				  "}\n"
+				  "\n"
+				  "10 == 10;\n"
+				  "10 != 9;\n";
+
+	struct lexer *lexer = lexer_new(input);
+	struct token expected[] = {
+		{ TOKEN_LET, slice_fullstr("let") },
+		{ TOKEN_IDENT, slice_fullstr("five") },
+		{ TOKEN_ASSIGN, slice_fullstr("=") },
+		{ TOKEN_INT, slice_fullstr("5") },
+		{ TOKEN_SEMICOLON, slice_fullstr(";") },
+		{ TOKEN_LET, slice_fullstr("let") },
+		{ TOKEN_IDENT, slice_fullstr("ten") },
+		{ TOKEN_ASSIGN, slice_fullstr("=") },
+		{ TOKEN_INT, slice_fullstr("10") },
+		{ TOKEN_SEMICOLON, slice_fullstr(";") },
+		{ TOKEN_LET, slice_fullstr("let") },
+		{ TOKEN_IDENT, slice_fullstr("add") },
+		{ TOKEN_ASSIGN, slice_fullstr("=") },
+		{ TOKEN_FUNC, slice_fullstr("fn") },
+		{ TOKEN_LPAREN, slice_fullstr("(") },
+		{ TOKEN_IDENT, slice_fullstr("x") },
+		{ TOKEN_COMMA, slice_fullstr(",") },
+		{ TOKEN_IDENT, slice_fullstr("y") },
+		{ TOKEN_RPAREN, slice_fullstr(")") },
+		{ TOKEN_LBRACE, slice_fullstr("{") },
+		{ TOKEN_IDENT, slice_fullstr("x") },
+		{ TOKEN_PLUS, slice_fullstr("+") },
+		{ TOKEN_IDENT, slice_fullstr("y") },
+		{ TOKEN_SEMICOLON, slice_fullstr(";") },
+		{ TOKEN_RBRACE, slice_fullstr("}") },
+		{ TOKEN_SEMICOLON, slice_fullstr(";") },
+		{ TOKEN_LET, slice_fullstr("let") },
+		{ TOKEN_IDENT, slice_fullstr("result") },
+		{ TOKEN_ASSIGN, slice_fullstr("=") },
+		{ TOKEN_IDENT, slice_fullstr("add") },
+		{ TOKEN_LPAREN, slice_fullstr("(") },
+		{ TOKEN_IDENT, slice_fullstr("five") },
+		{ TOKEN_COMMA, slice_fullstr(",") },
+		{ TOKEN_IDENT, slice_fullstr("ten") },
+		{ TOKEN_RPAREN, slice_fullstr(")") },
+		{ TOKEN_SEMICOLON, slice_fullstr(";") },
+		{ TOKEN_BANG, slice_fullstr("!") },
+		{ TOKEN_MINUS, slice_fullstr("-") },
+		{ TOKEN_SLASH, slice_fullstr("/") },
+		{ TOKEN_ASTERISK, slice_fullstr("*") },
+		{ TOKEN_INT, slice_fullstr("5") },
+		{ TOKEN_SEMICOLON, slice_fullstr(";") },
+		{ TOKEN_INT, slice_fullstr("5") },
+		{ TOKEN_LT, slice_fullstr("<") },
+		{ TOKEN_INT, slice_fullstr("10") },
+		{ TOKEN_GT, slice_fullstr(">") },
+		{ TOKEN_INT, slice_fullstr("5") },
+		{ TOKEN_SEMICOLON, slice_fullstr(";") },
+		{ TOKEN_IF, slice_fullstr("if") },
+		{ TOKEN_LPAREN, slice_fullstr("(") },
+		{ TOKEN_INT, slice_fullstr("5") },
+		{ TOKEN_LT, slice_fullstr("<") },
+		{ TOKEN_INT, slice_fullstr("10") },
+		{ TOKEN_RPAREN, slice_fullstr(")") },
+		{ TOKEN_LBRACE, slice_fullstr("{") },
+		{ TOKEN_RETURN, slice_fullstr("return") },
+		{ TOKEN_TRUE, slice_fullstr("true") },
+		{ TOKEN_SEMICOLON, slice_fullstr(";") },
+		{ TOKEN_RBRACE, slice_fullstr("}") },
+		{ TOKEN_ELSE, slice_fullstr("else") },
+		{ TOKEN_LBRACE, slice_fullstr("{") },
+		{ TOKEN_RETURN, slice_fullstr("return") },
+		{ TOKEN_FALSE, slice_fullstr("false") },
+		{ TOKEN_SEMICOLON, slice_fullstr(";") },
+		{ TOKEN_RBRACE, slice_fullstr("}") },
+		{ TOKEN_INT, slice_fullstr("10") },
+		{ TOKEN_EQ, slice_fullstr("==") },
+		{ TOKEN_INT, slice_fullstr("10") },
+		{ TOKEN_SEMICOLON, slice_fullstr(";") },
+		{ TOKEN_INT, slice_fullstr("10") },
+		{ TOKEN_NOTEQ, slice_fullstr("!=") },
+		{ TOKEN_INT, slice_fullstr("9") },
+		{ TOKEN_SEMICOLON, slice_fullstr(";") },
+		{ TOKEN_EOF, slice_fullstr("") },
+	};
+	size_t i = 0;
+
+	do {
+		struct token token = lexer_next_token(lexer);
+		asserteq(token.type, expected[i].type);
+		asserteq(slice_cmp(&token.literal, &expected[i].literal), 0);
+		i++;
+	} while (expected[i].type != TOKEN_EOF);
+
+	lexer_destroy(lexer);
+}
+
+int
+main(void)
+{
+	INIT_TESTS();
+	RUN_TEST(test_next_token);
+}