Initial commit

Basically it works, just needs some polishing and maybe a couple of
features that I could actually use.
Also probably better docs. Not sure if it will be of use to anybody
besides me.

4 files changed, 1018 insertions, 0 deletions

diff --git a/src/tests/lexer.c b/src/tests/lexer.c
new file mode 100644
index 0000000..a9cb142
--- /dev/null
+++ b/src/tests/lexer.c
@@ -0,0 +1,246 @@
+#include "tests/tests.h"
+#include "lexer.h"
+
+#include <string.h>
+
+#include "slice.h"
+#include "token.h"
+
+static void
+test_next_token(void)
+{
+	char *input = "{% extends \"template\" %}\n"
+				  "{% block rooster %}\n"
+				  "{% if true %}\n"
+				  "some content\n"
+				  "{% elif not false %}\n"
+				  "other content\n"
+				  "{% else %}\n"
+				  "yet something else\n"
+				  "{% endif %}\n"
+				  "{% for v in list %}\n"
+				  "{{ v+(1-2)*4/5 }}\n"
+				  "{% break %}\n"
+				  "{% endfor %}\n"
+				  "{% endblock %}\n"
+				  "{{ list[1] }}\n"
+				  "{{ map.value }}\n"
+				  "{{ 5 < 10 }}\n"
+				  "{{ 10 > 5 }}\n"
+				  "{{ 5 <= 10 }}\n"
+				  "{{ 10 >= 5 }}\n"
+				  "{{ 10 != 5 }}\n"
+				  "{{ 5 == 5 }}\n"
+				  "{{ 5 and 5 }}\n"
+				  "{{ 5 or 5 }}\n";
+
+	token_init_keywords();
+	struct lexer *lexer = lexer_new(input);
+	struct token expected[] = {
+		{ TOKEN_LBRACE, slice_whole("{"), 1, 1 },
+		{ TOKEN_PERCENT, slice_whole("%"), 1, 2 },
+		{ TOKEN_EXTENDS, slice_whole("extends"), 1, 4 },
+		{ TOKEN_STRING, slice_whole("\"template\""), 1, 12 },
+		{ TOKEN_PERCENT, slice_whole("%"), 1, 23 },
+		{ TOKEN_RBRACE, slice_whole("}"), 1, 24 },
+		{ TOKEN_CONTENT, slice_whole("\n"), 1, 25 },
+
+		{ TOKEN_LBRACE, slice_whole("{"), 2, 1 },
+		{ TOKEN_PERCENT, slice_whole("%"), 2, 2 },
+		{ TOKEN_BLOCK, slice_whole("block"), 2, 4 },
+		{ TOKEN_IDENT, slice_whole("rooster"), 2, 10 },
+		{ TOKEN_PERCENT, slice_whole("%"), 2, 18 },
+		{ TOKEN_RBRACE, slice_whole("}"), 2, 19 },
+		{ TOKEN_CONTENT, slice_whole("\n"), 2, 20 },
+
+		{ TOKEN_LBRACE, slice_whole("{"), 3, 1 },
+		{ TOKEN_PERCENT, slice_whole("%"), 3, 2 },
+		{ TOKEN_IF, slice_whole("if"), 3, 4 },
+		{ TOKEN_TRUE, slice_whole("true"), 3, 7 },
+		{ TOKEN_PERCENT, slice_whole("%"), 3, 12 },
+		{ TOKEN_RBRACE, slice_whole("}"), 3, 13 },
+		{ TOKEN_CONTENT, slice_whole("\nsome content\n"), 3, 14 },
+
+		{ TOKEN_LBRACE, slice_whole("{"), 5, 1 },
+		{ TOKEN_PERCENT, slice_whole("%"), 5, 2 },
+		{ TOKEN_ELIF, slice_whole("elif"), 5, 4 },
+		{ TOKEN_NOT, slice_whole("not"), 5, 9 },
+		{ TOKEN_FALSE, slice_whole("false"), 5, 12 },
+		{ TOKEN_PERCENT, slice_whole("%"), 5, 18 },
+		{ TOKEN_RBRACE, slice_whole("}"), 5, 19 },
+		{ TOKEN_CONTENT, slice_whole("\nother content\n"), 5, 20 },
+
+		{ TOKEN_LBRACE, slice_whole("{"), 7, 1 },
+		{ TOKEN_PERCENT, slice_whole("%"), 7, 2 },
+		{ TOKEN_ELSE, slice_whole("else"), 7, 4 },
+		{ TOKEN_PERCENT, slice_whole("%"), 7, 9 },
+		{ TOKEN_RBRACE, slice_whole("}"), 7, 10 },
+		{ TOKEN_CONTENT, slice_whole("\nyet something else\n"), 7, 11 },
+
+		{ TOKEN_LBRACE, slice_whole("{"), 9, 1 },
+		{ TOKEN_PERCENT, slice_whole("%"), 9, 2 },
+		{ TOKEN_ENDIF, slice_whole("endif"), 9, 4 },
+		{ TOKEN_PERCENT, slice_whole("%"), 9, 10 },
+		{ TOKEN_RBRACE, slice_whole("}"), 9, 11 },
+		{ TOKEN_CONTENT, slice_whole("\n"), 9, 12 },
+
+		{ TOKEN_LBRACE, slice_whole("{"), 10, 1 },
+		{ TOKEN_PERCENT, slice_whole("%"), 10, 2 },
+		{ TOKEN_FOR, slice_whole("for"), 10, 4 },
+		{ TOKEN_IDENT, slice_whole("v"), 10, 8 },
+		{ TOKEN_IN, slice_whole("in"), 10, 10 },
+		{ TOKEN_IDENT, slice_whole("list"), 10, 13 },
+		{ TOKEN_PERCENT, slice_whole("%"), 10, 18 },
+		{ TOKEN_RBRACE, slice_whole("}"), 10, 19 },
+		{ TOKEN_CONTENT, slice_whole("\n"), 10, 20 },
+
+		{ TOKEN_LBRACE, slice_whole("{"), 11, 1 },
+		{ TOKEN_LBRACE, slice_whole("{"), 11, 2 },
+		{ TOKEN_IDENT, slice_whole("v"), 11, 4 },
+		{ TOKEN_PLUS, slice_whole("+"), 11, 5 },
+		{ TOKEN_LPAREN, slice_whole("("), 11, 6 },
+		{ TOKEN_INT, slice_whole("1"), 11, 7 },
+		{ TOKEN_MINUS, slice_whole("-"), 11, 8 },
+		{ TOKEN_INT, slice_whole("2"), 11, 9 },
+		{ TOKEN_RPAREN, slice_whole(")"), 11, 10 },
+		{ TOKEN_ASTERISK, slice_whole("*"), 11, 11 },
+		{ TOKEN_INT, slice_whole("4"), 11, 12 },
+		{ TOKEN_SLASH, slice_whole("/"), 11, 13 },
+		{ TOKEN_INT, slice_whole("5"), 11, 14 },
+		{ TOKEN_RBRACE, slice_whole("}"), 11, 16 },
+		{ TOKEN_RBRACE, slice_whole("}"), 11, 17 },
+		{ TOKEN_CONTENT, slice_whole("\n"), 11, 18 },
+
+		{ TOKEN_LBRACE, slice_whole("{"), 12, 1 },
+		{ TOKEN_PERCENT, slice_whole("%"), 12, 2 },
+		{ TOKEN_BREAK, slice_whole("break"), 12, 4 },
+		{ TOKEN_PERCENT, slice_whole("%"), 12, 10 },
+		{ TOKEN_RBRACE, slice_whole("}"), 12, 11 },
+		{ TOKEN_CONTENT, slice_whole("\n"), 12, 12 },
+
+		{ TOKEN_LBRACE, slice_whole("{"), 13, 1 },
+		{ TOKEN_PERCENT, slice_whole("%"), 13, 2 },
+		{ TOKEN_ENDFOR, slice_whole("endfor"), 13, 4 },
+		{ TOKEN_PERCENT, slice_whole("%"), 13, 11 },
+		{ TOKEN_RBRACE, slice_whole("}"), 13, 12 },
+		{ TOKEN_CONTENT, slice_whole("\n"), 13, 13 },
+
+		{ TOKEN_LBRACE, slice_whole("{"), 14, 1 },
+		{ TOKEN_PERCENT, slice_whole("%"), 14, 2 },
+		{ TOKEN_ENDBLOCK, slice_whole("endblock"), 14, 4 },
+		{ TOKEN_PERCENT, slice_whole("%"), 14, 13 },
+		{ TOKEN_RBRACE, slice_whole("}"), 14, 14 },
+		{ TOKEN_CONTENT, slice_whole("\n"), 14, 15 },
+
+		{ TOKEN_LBRACE, slice_whole("{"), 15, 1 },
+		{ TOKEN_LBRACE, slice_whole("{"), 15, 2 },
+		{ TOKEN_IDENT, slice_whole("list"), 15, 4 },
+		{ TOKEN_LBRACKET, slice_whole("["), 15, 8 },
+		{ TOKEN_INT, slice_whole("1"), 15, 9 },
+		{ TOKEN_RBRACKET, slice_whole("]"), 15, 10 },
+		{ TOKEN_RBRACE, slice_whole("}"), 15, 12 },
+		{ TOKEN_RBRACE, slice_whole("}"), 15, 13 },
+		{ TOKEN_CONTENT, slice_whole("\n"), 15, 14 },
+
+		{ TOKEN_LBRACE, slice_whole("{"), 16, 1 },
+		{ TOKEN_LBRACE, slice_whole("{"), 16, 2 },
+		{ TOKEN_IDENT, slice_whole("map"), 16, 4 },
+		{ TOKEN_DOT, slice_whole("."), 16, 7 },
+		{ TOKEN_IDENT, slice_whole("value"), 16, 8 },
+		{ TOKEN_RBRACE, slice_whole("}"), 16, 10 },
+		{ TOKEN_RBRACE, slice_whole("}"), 16, 11 },
+		{ TOKEN_CONTENT, slice_whole("\n"), 16, 12 },
+
+		{ TOKEN_LBRACE, slice_whole("{"), 17, 1 },
+		{ TOKEN_LBRACE, slice_whole("{"), 17, 2 },
+		{ TOKEN_INT, slice_whole("5"), 17, 4 },
+		{ TOKEN_LT, slice_whole("<"), 17, 6 },
+		{ TOKEN_INT, slice_whole("10"), 17, 8 },
+		{ TOKEN_RBRACE, slice_whole("}"), 17, 11 },
+		{ TOKEN_RBRACE, slice_whole("}"), 17, 12 },
+		{ TOKEN_CONTENT, slice_whole("\n"), 17, 13 },
+
+		{ TOKEN_LBRACE, slice_whole("{"), 18, 1 },
+		{ TOKEN_LBRACE, slice_whole("{"), 18, 2 },
+		{ TOKEN_INT, slice_whole("10"), 18, 4 },
+		{ TOKEN_GT, slice_whole(">"), 18, 7 },
+		{ TOKEN_INT, slice_whole("5"), 18, 9 },
+		{ TOKEN_RBRACE, slice_whole("}"), 18, 11 },
+		{ TOKEN_RBRACE, slice_whole("}"), 18, 12 },
+		{ TOKEN_CONTENT, slice_whole("\n"), 18, 13 },
+
+		{ TOKEN_LBRACE, slice_whole("{"), 19, 1 },
+		{ TOKEN_LBRACE, slice_whole("{"), 19, 2 },
+		{ TOKEN_INT, slice_whole("5"), 19, 4 },
+		{ TOKEN_LTE, slice_whole("<="), 19, 6 },
+		{ TOKEN_INT, slice_whole("10"), 19, 9 },
+		{ TOKEN_RBRACE, slice_whole("}"), 19, 12 },
+		{ TOKEN_RBRACE, slice_whole("}"), 19, 13 },
+		{ TOKEN_CONTENT, slice_whole("\n"), 19, 14 },
+
+		{ TOKEN_LBRACE, slice_whole("{"), 20, 1 },
+		{ TOKEN_LBRACE, slice_whole("{"), 20, 2 },
+		{ TOKEN_INT, slice_whole("10"), 20, 4 },
+		{ TOKEN_GTE, slice_whole(">="), 20, 7 },
+		{ TOKEN_INT, slice_whole("5"), 20, 10 },
+		{ TOKEN_RBRACE, slice_whole("}"), 20, 12 },
+		{ TOKEN_RBRACE, slice_whole("}"), 20, 13 },
+		{ TOKEN_CONTENT, slice_whole("\n"), 20, 14 },
+
+		{ TOKEN_LBRACE, slice_whole("{"), 21, 1 },
+		{ TOKEN_LBRACE, slice_whole("{"), 21, 2 },
+		{ TOKEN_INT, slice_whole("10"), 21, 4 },
+		{ TOKEN_NOTEQ, slice_whole("!="), 21, 7 },
+		{ TOKEN_INT, slice_whole("5"), 21, 10 },
+		{ TOKEN_RBRACE, slice_whole("}"), 21, 12 },
+		{ TOKEN_RBRACE, slice_whole("}"), 21, 13 },
+		{ TOKEN_CONTENT, slice_whole("\n"), 21, 14 },
+
+		{ TOKEN_LBRACE, slice_whole("{"), 22, 1 },
+		{ TOKEN_LBRACE, slice_whole("{"), 22, 2 },
+		{ TOKEN_INT, slice_whole("5"), 22, 4 },
+		{ TOKEN_EQ, slice_whole("=="), 22, 6 },
+		{ TOKEN_INT, slice_whole("5"), 22, 9 },
+		{ TOKEN_RBRACE, slice_whole("}"), 22, 11 },
+		{ TOKEN_RBRACE, slice_whole("}"), 22, 12 },
+		{ TOKEN_CONTENT, slice_whole("\n"), 22, 13 },
+
+		{ TOKEN_LBRACE, slice_whole("{"), 23, 1 },
+		{ TOKEN_LBRACE, slice_whole("{"), 23, 2 },
+		{ TOKEN_INT, slice_whole("5"), 23, 4 },
+		{ TOKEN_AND, slice_whole("and"), 23, 6 },
+		{ TOKEN_INT, slice_whole("5"), 23, 10 },
+		{ TOKEN_RBRACE, slice_whole("}"), 23, 12 },
+		{ TOKEN_RBRACE, slice_whole("}"), 23, 13 },
+		{ TOKEN_CONTENT, slice_whole("\n"), 23, 14 },
+
+		{ TOKEN_LBRACE, slice_whole("{"), 24, 1 },
+		{ TOKEN_LBRACE, slice_whole("{"), 24, 2 },
+		{ TOKEN_INT, slice_whole("5"), 24, 4 },
+		{ TOKEN_OR, slice_whole("or"), 24, 6 },
+		{ TOKEN_INT, slice_whole("5"), 24, 9 },
+		{ TOKEN_RBRACE, slice_whole("}"), 24, 11 },
+		{ TOKEN_RBRACE, slice_whole("}"), 24, 12 },
+		{ TOKEN_CONTENT, slice_whole("\n"), 24, 13 },
+
+		{ TOKEN_EOF, },
+	};
+	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);
+	token_free_keywords();
+}
+
+int
+main(void)
+{
+	INIT_TESTS();
+	RUN_TEST(test_next_token);
+}
diff --git a/src/tests/parser.c b/src/tests/parser.c
new file mode 100644
index 0000000..eb5c2a1
--- /dev/null
+++ b/src/tests/parser.c
@@ -0,0 +1,542 @@
+#define _POSIX_C_SOURCE 200809L
+#include "parser.h"
+#include "tests/tests.h"
+
+#include "ast.h"
+#include "slice.h"
+
+#include <string.h>
+
+enum value_type {
+	VALUE_IDENT,
+	VALUE_INT,
+	VALUE_BOOL,
+	VALUE_STRING,
+};
+
+struct value {
+	union {
+		struct slice ident;
+		struct slice string;
+		int64_t integer;
+		bool boolean;
+	};
+	enum value_type type;
+};
+
+static void
+check_parser_errors(struct parser *parser, const char *file, int line,
+		const char *func)
+{
+	if (parser->errors->len > 0) {
+		printf("\n");
+		size_t i;
+		sds val;
+		vector_foreach (parser->errors, i, val) {
+			printf("parser error %lu: %s\n", i, val);
+		}
+		printf(TBLD TRED "FAIL!\n" TRST);
+		printf("%s:%d: %s: ", file, line, func);
+		printf("parser encountered errors\n");
+		abort();
+	}
+}
+
+#define check_parser_errors(p) \
+	check_parser_errors(p, __FILE__, __LINE__, __func__)
+
+static void
+test_integer_literal(struct expression *expr, int64_t val)
+{
+	char buf[128];
+	struct slice sval;
+	asserteq(expr->type, EXPRESSION_INT);
+	asserteq(expr->integer.value, val);
+	sprintf(buf, "%ld", val);
+	sval = slice_whole(buf);
+	asserteq(slice_cmp(&expr->token.literal, &sval), 0);
+}
+
+static void
+test_identifier(struct expression *expr, struct slice *ident)
+{
+	asserteq(expr->type, EXPRESSION_IDENT);
+	asserteq(slice_cmp(&expr->token.literal, ident), 0);
+}
+
+static void
+test_boolean_literal(struct expression *expr, bool val)
+{
+	char *str = val ? "true" : "false";
+	struct slice sval = slice_whole(str);
+	asserteq(expr->type, EXPRESSION_BOOL);
+	asserteq(expr->boolean.value, val);
+	asserteq(slice_cmp(&expr->token.literal, &sval), 0);
+}
+
+static void
+test_string_literal(struct expression *expr, const struct slice *val)
+{
+	asserteq(expr->type, EXPRESSION_STRING);
+	asserteq(slice_cmp(&expr->string.value, val), 0);
+}
+
+
+static inline void
+test_expected(struct expression *expr, struct value v)
+{
+	switch(v.type) {
+		case VALUE_IDENT:
+			test_identifier(expr, &v.ident);
+			break;
+		case VALUE_INT:
+			test_integer_literal(expr, v.integer);
+			break;
+		case VALUE_BOOL:
+			test_boolean_literal(expr, v.boolean);
+			break;
+		case VALUE_STRING:
+			test_string_literal(expr, &v.string);
+			break;
+	}
+}
+
+#define VIDENT(v) \
+	(struct value){ .type = VALUE_IDENT, .ident = slice_whole(v) }
+
+#define VINT(v) \
+	(struct value){ .type = VALUE_INT, .integer = v }
+
+#define VBOOL(v) \
+	(struct value){ .type = VALUE_BOOL, .boolean = v }
+
+#define VSTR(v) \
+	(struct value){ .type = VALUE_STRING, .string = slice_whole(v) }
+
+static inline void
+test_infix(struct infix *expr, struct value lval, struct slice *op,
+		struct value rval)
+{
+	test_expected(expr->left, lval);
+	asserteq(slice_cmp(&expr->operator, op), 0);
+	test_expected(expr->right, rval);
+}
+
+static inline void
+test_literal_variables(void)
+{
+	struct {
+		char *input;
+		struct value val;
+	} tests[] = {
+		{ "{{ foo }}", VIDENT("foo"), },
+		{ "{{ 20 }}", VINT(20), },
+		{ "{{ true }}", VBOOL(true), },
+		{ "{{ false }}", VBOOL(false), },
+		{ 0 },
+	};
+	for (size_t i = 0; tests[i].input != NULL; i++) {
+		struct parser *parser = parser_new(strdup("test"), tests[i].input);
+		struct template *tmpl = parser_parse_template(parser);
+		check_parser_errors(parser);
+		assertneq(tmpl, NULL);
+		asserteq(tmpl->blocks->len, 1);
+		struct block *blk = tmpl->blocks->values[0];
+		asserteq(blk->type, BLOCK_VARIABLE);
+		test_expected(blk->variable.expression, tests[i].val);
+		parser_destroy(parser);
+		template_destroy(tmpl);
+	}
+}
+
+static inline void
+test_prefix_variables(void)
+{
+	struct {
+		char *input;
+		struct slice operator;
+		struct value val;
+	} tests[] = {
+		{ "{{ !foo }}", slice_whole("!"), VIDENT("foo"), },
+		{ "{{ -bar }}", slice_whole("-"), VIDENT("bar"), },
+		{ "{{ -20 }}", slice_whole("-"), VINT(20), },
+		{ "{{ !true }}", slice_whole("!"), VBOOL(true), },
+		{ "{{ !false }}", slice_whole("!"), VBOOL(false), },
+		{ "{{ not false }}", slice_whole("not"), VBOOL(false), },
+		{ 0 },
+	};
+	for (size_t i = 0; tests[i].input != NULL; i++) {
+		struct parser *parser = parser_new(strdup("test"), tests[i].input);
+		struct template *tmpl = parser_parse_template(parser);
+		check_parser_errors(parser);
+		assertneq(tmpl, NULL);
+		asserteq(tmpl->blocks->len, 1);
+		struct block *blk = tmpl->blocks->values[0];
+		asserteq(blk->type, BLOCK_VARIABLE);
+		asserteq(blk->variable.expression->type, EXPRESSION_PREFIX);
+		struct expression *pref = blk->variable.expression;
+		asserteq(slice_cmp(&pref->prefix.operator, &tests[i].operator), 0);
+		test_expected(pref->prefix.right, tests[i].val);
+		parser_destroy(parser);
+		template_destroy(tmpl);
+	}
+}
+
+static inline void
+test_infix_variables(void)
+{
+	struct {
+		char *input;
+		struct value left;
+		struct slice operator;
+		struct value right;
+	} tests[] = {
+		{ "{{ foo + bar }}", VIDENT("foo"), slice_whole("+"), VIDENT("bar"), },
+		{ "{{ 6 - 9 }}", VINT(6),slice_whole("-"), VINT(9), },
+		{ "{{ 4 * 20 }}", VINT(4), slice_whole("*"), VINT(20), },
+		{ "{{ foo / 20 }}", VIDENT("foo"), slice_whole("/"), VINT(20), },
+		{ "{{ \"str\" == \"str\" }}", VSTR("str"), slice_whole("=="), VSTR("str"), },
+		{ "{{ true != false }}", VBOOL(true), slice_whole("!="), VBOOL(false), },
+		{ "{{ 4 < 20 }}", VINT(4), slice_whole("<"), VINT(20), },
+		{ "{{ 4 <= 20 }}", VINT(4), slice_whole("<="), VINT(20), },
+		{ "{{ 100 > 20 }}", VINT(100), slice_whole(">"), VINT(20), },
+		{ "{{ 100 >= 20 }}", VINT(100), slice_whole(">="), VINT(20), },
+		{ "{{ true and true }}", VBOOL(true), slice_whole("and"), VBOOL(true), },
+		{ "{{ true or false }}", VBOOL(true), slice_whole("or"), VBOOL(false), },
+		{ 0 },
+	};
+	for (size_t i = 0; tests[i].input != NULL; i++) {
+		struct parser *parser = parser_new(strdup("test"), tests[i].input);
+		struct template *tmpl = parser_parse_template(parser);
+		check_parser_errors(parser);
+		assertneq(tmpl, NULL);
+		asserteq(tmpl->blocks->len, 1);
+		struct block *blk = tmpl->blocks->values[0];
+		asserteq(blk->type, BLOCK_VARIABLE);
+		asserteq(blk->variable.expression->type, EXPRESSION_INFIX);
+		test_infix(&blk->variable.expression->infix,
+				tests[i].left, &tests[i].operator, tests[i].right);
+		parser_destroy(parser);
+		template_destroy(tmpl);
+	}
+}
+
+static inline void
+test_map_variables(void)
+{
+	char *input = "{{ map.key }}";
+	struct value left = VIDENT("map");
+	struct value key = VIDENT("key");
+	struct parser *parser = parser_new(strdup("test"), input);
+	struct template *tmpl = parser_parse_template(parser);
+	check_parser_errors(parser);
+	assertneq(tmpl, NULL);
+	asserteq(tmpl->blocks->len, 1);
+	struct block *blk = tmpl->blocks->values[0];
+	asserteq(blk->type, BLOCK_VARIABLE);
+	asserteq(blk->variable.expression->type, EXPRESSION_MAPKEY);
+	struct expression *map = blk->variable.expression;
+	test_expected(map->indexkey.left, left);
+	test_expected(map->indexkey.key, key);
+	parser_destroy(parser);
+	template_destroy(tmpl);
+}
+
+static inline void
+test_index_variables(void)
+{
+	char *input = "{{ arr[1 + 2] }}";
+	struct value left = VIDENT("arr");
+	struct value ileft = VINT(1);
+	struct slice iop = slice_whole("+");
+	struct value iright = VINT(2);
+	struct parser *parser = parser_new(strdup("test"), input);
+	struct template *tmpl = parser_parse_template(parser);
+	check_parser_errors(parser);
+
+	assertneq(tmpl, NULL);
+	asserteq(tmpl->blocks->len, 1);
+	struct block *blk = tmpl->blocks->values[0];
+	asserteq(blk->type, BLOCK_VARIABLE);
+	asserteq(blk->variable.expression->type, EXPRESSION_INDEX);
+	struct expression *map = blk->variable.expression;
+	test_expected(map->indexkey.left, left);
+	test_infix(&map->indexkey.key->infix, ileft, &iop, iright);
+
+	parser_destroy(parser);
+	template_destroy(tmpl);
+}
+
+static inline void
+test_operator_precedence(void)
+{
+	struct {
+		char *input;
+		char *expected;
+	} tests[] = {
+		{
+			"{{ -a * b }}",
+			"{{ ((-a) * b) }}",
+		},
+		{
+			"{{ 1 + 2 * 3 }}",
+			"{{ (1 + (2 * 3)) }}",
+		},
+		{
+			"{{ !-a }}",
+			"{{ (!(-a)) }}",
+		},
+		{
+			"{{ a + b + c }}",
+			"{{ ((a + b) + c) }}",
+		},
+		{
+			"{{ a + b - c }}",
+			"{{ ((a + b) - c) }}",
+		},
+		{
+			"{{ a * b * c }}",
+			"{{ ((a * b) * c) }}",
+		},
+		{
+			"{{ a * b / c }}",
+			"{{ ((a * b) / c) }}",
+		},
+		{
+			"{{ a + b / c }}",
+			"{{ (a + (b / c)) }}",
+		},
+		{
+			"{{ a + b * c + d / e - f }}",
+			"{{ (((a + (b * c)) + (d / e)) - f) }}",
+		},
+		{
+			"{{ 5 > 4 == 3 < 4 }}",
+			"{{ ((5 > 4) == (3 < 4)) }}",
+		},
+		{
+			"{{ 5 < 4 != 3 > 4 }}",
+			"{{ ((5 < 4) != (3 > 4)) }}",
+		},
+		{
+			"{{ 3 + 4 * 5 == 3 * 1 + 4 * 5 }}",
+			"{{ ((3 + (4 * 5)) == ((3 * 1) + (4 * 5))) }}",
+		},
+		{
+			"{{ (5 + 5) * 2 }}",
+			"{{ ((5 + 5) * 2) }}",
+		},
+		{
+			"{{ 2 / (5 + 5) }}",
+			"{{ (2 / (5 + 5)) }}",
+		},
+		{
+			"{{ (5 + 5) * 2 * (5 + 5) }}",
+			"{{ (((5 + 5) * 2) * (5 + 5)) }}",
+		},
+		{
+			"{{ -(5 + 5) }}",
+			"{{ (-(5 + 5)) }}",
+		},
+		{
+			"{{ foo[0] + bar[1 + 2] }}",
+			"{{ (foo[0] + bar[(1 + 2)]) }}",
+		},
+		{
+			"{{ foo.bar + foo.baz }}",
+			"{{ (foo.bar + foo.baz) }}",
+		},
+		{
+			"{{ foo.bar + bar[0].baz * foo.bar.baz }}",
+			"{{ (foo.bar + (bar[0].baz * foo.bar.baz)) }}",
+		},
+		{ 0 },
+	};
+	for (size_t i = 0; tests[i].input != NULL; i++) {
+		struct parser *parser = parser_new(strdup("test"), tests[i].input);
+		struct template *tmpl = parser_parse_template(parser);
+		check_parser_errors(parser);
+		assertneq(tmpl, NULL);
+		asserteq(tmpl->blocks->len, 1);
+		struct block *blk = tmpl->blocks->values[0];
+		asserteq(blk->type, BLOCK_VARIABLE);
+		sds output = block_string(blk, sdsempty());
+		asserteq(strcmp(output, tests[i].expected), 0);
+		sdsfree(output);
+		parser_destroy(parser);
+		template_destroy(tmpl);
+	}
+}
+
+static inline void
+test_loop_tag(void)
+{
+	char *input = "{% for v in seq %}"
+				  "{% break %}"
+				  "{% endfor %}";
+	struct slice item = slice_whole("v");
+	struct slice seq = slice_whole("seq");
+	struct parser *parser = parser_new(strdup("test"), input);
+	struct template *tmpl = parser_parse_template(parser);
+	check_parser_errors(parser);
+
+	assertneq(tmpl, NULL);
+	asserteq(tmpl->blocks->len, 1);
+	struct block *blk = tmpl->blocks->values[0];
+	asserteq(blk->type, BLOCK_TAG);
+	asserteq(blk->tag.type, TAG_FOR);
+	asserteq(slice_cmp(&blk->tag.loop.item.token.literal, &item), 0);
+	struct expression *seqexpr = blk->tag.loop.seq;
+	asserteq(seqexpr->type, EXPRESSION_IDENT);
+	asserteq(slice_cmp(&seqexpr->ident.token.literal, &seq), 0);
+	asserteq(blk->tag.loop.subblocks->len, 2);
+	struct block *sub1 = blk->tag.loop.subblocks->values[0];
+	struct block *sub2 = blk->tag.loop.subblocks->values[1];
+	asserteq(sub1->type, BLOCK_TAG);
+	asserteq(sub2->type, BLOCK_TAG);
+	asserteq(sub1->tag.type, TAG_BREAK);
+	asserteq(sub2->tag.type, TAG_CLOSE);
+	asserteq(sub2->tag.token.type, TOKEN_ENDFOR);
+
+	parser_destroy(parser);
+	template_destroy(tmpl);
+}
+
+static inline void
+test_cond_tag(void)
+{
+	char *input = "{% if false %}"
+				  "{{ foo }}"
+				  "{% elif 1 > 2 %}"
+				  "{{ bar }}"
+				  "{% else %}"
+				  "baz"
+				  "{% endif %}";
+	struct value ifexp = VIDENT("foo");
+	struct value elifl = VINT(1);
+	struct slice elifop = slice_whole(">");
+	struct value elifr = VINT(2);
+	struct value elifexp = VIDENT("bar");
+	struct slice elsecont = slice_whole("baz");
+	struct parser *parser = parser_new(strdup("test"), input);
+	struct template *tmpl = parser_parse_template(parser);
+	check_parser_errors(parser);
+
+	assertneq(tmpl, NULL);
+	asserteq(tmpl->blocks->len, 1);
+	struct block *blk = tmpl->blocks->values[0];
+	asserteq(blk->type, BLOCK_TAG);
+	asserteq(blk->tag.type, TAG_IF);
+
+	struct branch *b1 = blk->tag.cond.root;
+	assertneq(b1->condition, NULL);
+	asserteq(b1->condition->type, EXPRESSION_BOOL);
+	asserteq(b1->condition->token.type, TOKEN_FALSE);
+	asserteq(b1->subblocks->len, 1);
+	struct block *b1sub1 = b1->subblocks->values[0];
+	asserteq(b1sub1->type, BLOCK_VARIABLE);
+	test_expected(b1sub1->variable.expression, ifexp);
+
+	struct branch *b2 = b1->next;
+	assertneq(b2->condition, NULL);
+	test_infix(&b2->condition->infix, elifl, &elifop, elifr);
+	asserteq(b2->subblocks->len, 1);
+	struct block *b2sub1 = b2->subblocks->values[0];
+	asserteq(b2sub1->type, BLOCK_VARIABLE);
+	test_expected(b2sub1->variable.expression, elifexp);
+
+	struct branch *b3 = b2->next;
+	asserteq(b3->condition, NULL);
+	asserteq(b3->subblocks->len, 2);
+	struct block *b3sub1 = b3->subblocks->values[0];
+	asserteq(b3sub1->type, BLOCK_CONTENT);
+	asserteq(slice_cmp(&b3sub1->content.token.literal, &elsecont), 0);
+	struct block *b3sub2 = b3->subblocks->values[1];
+	asserteq(b3sub2->tag.type, TAG_CLOSE);
+	asserteq(b3sub2->tag.token.type, TOKEN_ENDIF);
+
+	parser_destroy(parser);
+	template_destroy(tmpl);
+}
+
+static inline void
+test_parent_tag(void)
+{
+	char *input = "{% extends \"base.html\" %}";
+	struct slice name = slice_whole("base.html");
+	struct parser *parser = parser_new(strdup("test"), input);
+	struct template *tmpl = parser_parse_template(parser);
+	check_parser_errors(parser);
+
+	assertneq(tmpl, NULL);
+	asserteq(tmpl->blocks->len, 1);
+	struct block *blk = tmpl->blocks->values[0];
+	asserteq(blk->type, BLOCK_TAG);
+	asserteq(blk->tag.type, TAG_EXTENDS);
+	asserteq(slice_cmp(&blk->tag.parent.name->value, &name), 0);
+
+	parser_destroy(parser);
+	template_destroy(tmpl);
+}
+
+static inline void
+test_tblock_tag(void)
+{
+	char *input = "{% block cock %}"
+				  "{% endblock %}";
+	struct slice name = slice_whole("cock");
+	struct parser *parser = parser_new(strdup("test"), input);
+	struct template *tmpl = parser_parse_template(parser);
+	check_parser_errors(parser);
+
+	assertneq(tmpl, NULL);
+	asserteq(tmpl->blocks->len, 1);
+	struct block *blk = tmpl->blocks->values[0];
+	asserteq(blk->type, BLOCK_TAG);
+	asserteq(blk->tag.type, TAG_BLOCK);
+	asserteq(slice_cmp(&blk->tag.tblock.name.token.literal, &name), 0);
+	asserteq(blk->tag.tblock.subblocks->len, 1);
+	struct block *sub1 = blk->tag.tblock.subblocks->values[0];
+	asserteq(sub1->type, BLOCK_TAG);
+	asserteq(sub1->tag.type, TAG_CLOSE);
+	asserteq(sub1->tag.token.type, TOKEN_ENDBLOCK);
+
+	blk = hmap_gets(tmpl->tblocks, &name);
+	assertneq(blk, NULL);
+	asserteq(blk->type, BLOCK_TAG);
+	asserteq(blk->tag.type, TAG_BLOCK);
+	asserteq(slice_cmp(&blk->tag.tblock.name.token.literal, &name), 0);
+
+	parser_destroy(parser);
+	template_destroy(tmpl);
+}
+
+static void
+init(void)
+{
+	parser_init();
+}
+
+static void
+cleanup(void)
+{
+	parser_deinit();
+}
+
+int
+main(void)
+{
+	init();
+	INIT_TESTS();
+	RUN_TEST(test_literal_variables);
+	RUN_TEST(test_prefix_variables);
+	RUN_TEST(test_infix_variables);
+	RUN_TEST(test_map_variables);
+	RUN_TEST(test_index_variables);
+	RUN_TEST(test_operator_precedence);
+	RUN_TEST(test_loop_tag);
+	RUN_TEST(test_cond_tag);
+	RUN_TEST(test_parent_tag);
+	RUN_TEST(test_tblock_tag);
+	cleanup();
+}
diff --git a/src/tests/roscha.c b/src/tests/roscha.c
new file mode 100644
index 0000000..92b8bc4
--- /dev/null
+++ b/src/tests/roscha.c
@@ -0,0 +1,189 @@
+#define _POSIX_C_SOURCE 200809L
+#include "tests/tests.h"
+#include "roscha.h"
+
+#include <string.h>
+
+static void
+check_env_errors(struct roscha_env *env, const char *file, int line,
+		const char *func)
+{
+	struct vector *errors = roscha_env_check_errors(env);
+	if (!errors) return;
+	printf("\n");
+	size_t i;
+	sds val;
+	vector_foreach (errors, i, val) {
+		printf("parser error %lu: %s\n", i, val);
+	}
+	printf(TBLD TRED "FAIL!\n" TRST);
+	printf("%s:%d: %s: ", file, line, func);
+	printf("parser encountered errors\n");
+	abort();
+}
+
+#define check_env_errors(p) \
+	check_env_errors(p, __FILE__, __LINE__, __func__)
+
+static void
+test_eval_variable(void)
+{
+	char *input = "{{ foo.bar }}"
+				  "{{ foo.bar + foo.baz }}"
+				  "{{ foo.bar - foo.baz }}"
+				  "{{ foo.bar * foo.baz }}"
+				  "{{ foo.bar / foo.baz }}"
+				  "{{ l }}"
+				  "{{ l[0] }}, {{ l[1] }}"
+				  "";
+	char *expected = "8"
+				  "12"
+				  "4"
+				  "32"
+				  "2"
+				  "[ hello, world, ]"
+				  "hello, world"
+				  "";
+	struct roscha_object *foo = roscha_object_new(hmap_new());
+	roscha_hmap_set_new(foo, "bar", 8);
+	roscha_hmap_set_new(foo, "baz", 4);
+	struct roscha_object *l = roscha_object_new(vector_new());
+	roscha_vector_push_new(l, (slice_whole("hello")));
+	roscha_vector_push_new(l, (slice_whole("world")));
+	struct roscha_env *env = roscha_env_new();
+	roscha_env_add_template(env, strdup("test"), input);
+	check_env_errors(env);
+	roscha_hmap_set(env->vars, "foo", foo);
+	roscha_hmap_set(env->vars, "l", l);
+
+	sds got = roscha_env_render(env, "test");
+	check_env_errors(env);
+	asserteq(strcmp(got, expected), 0);
+	roscha_env_destroy(env);
+	sdsfree(got);
+	roscha_object_unref(foo);
+	roscha_object_unref(l);
+}
+
+static void
+test_eval_cond(void)
+{
+	char *input = "{% if foo > bar %}"
+				  "Yes"
+				  "{% elif baz %}"
+				  "Maybe"
+				  "{% else %}"
+				  "No"
+				  "{% endif %}";
+	char *expected1 = "No";
+	char *expected2 = "Maybe";
+	char *expected3 = "Yes";
+	struct roscha_object *foo = roscha_object_new(10);
+	struct roscha_object *bar = roscha_object_new(20);
+	struct roscha_object *baz = roscha_object_new(69);
+
+	struct roscha_env *env = roscha_env_new();
+	roscha_env_add_template(env, strdup("test"), input);
+	check_env_errors(env);
+	roscha_hmap_set(env->vars, "foo", foo);
+	roscha_hmap_set(env->vars, "bar", bar);
+
+	sds got = roscha_env_render(env, "test");
+	check_env_errors(env);
+	asserteq(strcmp(got, expected1), 0);
+	sdsfree(got);
+
+	roscha_hmap_set(env->vars, "baz", baz);
+	got = roscha_env_render(env, "test");
+	check_env_errors(env);
+	asserteq(strcmp(got, expected2), 0);
+	sdsfree(got);
+
+	foo->integer = 420;
+	got = roscha_env_render(env, "test");
+	check_env_errors(env);
+	asserteq(strcmp(got, expected3), 0);
+	sdsfree(got);
+
+	roscha_env_destroy(env);
+	roscha_object_unref(foo);
+	roscha_object_unref(bar);
+	roscha_object_unref(baz);
+}
+
+static void
+test_eval_loop(void)
+{
+	char *input = "{% for v in foo %}"
+				  "{{ loop.index }}"
+				  "{{ v }}"
+				  "{% endfor %}";
+	char *expected = "0hello1world";
+
+	struct roscha_object *foo = roscha_object_new(vector_new());
+	roscha_vector_push_new(foo, (slice_whole("hello")));
+	roscha_vector_push_new(foo, (slice_whole("world")));
+
+	struct roscha_env *env = roscha_env_new();
+	roscha_env_add_template(env, strdup("test"), input);
+	check_env_errors(env);
+	roscha_hmap_set(env->vars, "foo", foo);
+	sds got = roscha_env_render(env, "test");
+	check_env_errors(env);
+	asserteq(strcmp(got, expected), 0);
+
+	sdsfree(got);
+	roscha_env_destroy(env);
+	roscha_object_unref(foo);
+}
+
+static void
+test_eval_child(void)
+{
+	char *parent = "hello{% block title %}{% endblock %}"
+				   "{% block content %}Content{% endblock %}"
+				   "{% block foot %}Foot{% endblock %}";
+	char *child = "{% extends \"parent\" %}"
+				  "{% block title %}, world{% endblock %}"
+				  "{% block content %}"
+				  "In a beautiful place out in the country."
+				  "{% endblock %}";
+	char *expected = "hello, world"
+					 "In a beautiful place out in the country."
+					 "Foot";
+	struct roscha_env *env = roscha_env_new();
+	roscha_env_add_template(env, strdup("parent"), parent);
+	check_env_errors(env);
+	roscha_env_add_template(env, strdup("child"), child);
+	check_env_errors(env);
+	sds got = roscha_env_render(env, "child");
+	check_env_errors(env);
+	asserteq(strcmp(got, expected), 0);
+
+	sdsfree(got);
+	roscha_env_destroy(env);
+}
+
+static void
+init(void)
+{
+	roscha_init();
+}
+
+static void
+cleanup(void)
+{
+	roscha_deinit();
+}
+
+int
+main(void)
+{
+	init();
+	INIT_TESTS();
+	RUN_TEST(test_eval_variable);
+	RUN_TEST(test_eval_cond);
+	RUN_TEST(test_eval_loop);
+	RUN_TEST(test_eval_child);
+	cleanup();
+}
diff --git a/src/tests/slice.c b/src/tests/slice.c
new file mode 100644
index 0000000..1f3875a
--- /dev/null
+++ b/src/tests/slice.c
@@ -0,0 +1,41 @@
+#include "tests/tests.h"
+#include "slice.h"
+
+#include <string.h>
+
+static void
+test_slice_cmp(void)
+{
+	struct slice s1a = {
+		.str = "hello world",
+		.start = 6,
+		.end = 11,
+	};
+	struct slice s1b = {
+		.str = "world",
+		.start = 0,
+		.end = 5,
+	};
+	asserteq(slice_cmp(&s1a, &s1b), 0);
+}
+
+static void
+test_slice_string(void)
+{
+	struct slice slice = {
+		.str = "hello world",
+		.start = 6,
+		.end = 11,
+	};
+	sds str = sdsempty();
+	slice_string(&slice, str);
+	asserteq(strcmp("world", str), 0);
+}
+
+int
+main(void)
+{
+	INIT_TESTS();
+	RUN_TEST(test_slice_cmp);
+	RUN_TEST(test_slice_string);
+}