From 3469623feef1c16e3f697560040c4b1719102548 Mon Sep 17 00:00:00 2001
From: Laria Carolin Chabowski <laria@laria.me>
Date: Thu, 16 Dec 2021 23:42:37 +0100
Subject: [PATCH] Add first parser test cases

---
 src/Makefile.am   |   5 ++
 src/parser_test.c | 150 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 155 insertions(+)
 create mode 100644 src/parser_test.c

diff --git a/src/Makefile.am b/src/Makefile.am
index 2eb2648..d97387a 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -35,3 +35,8 @@ TESTS += tokenizer.test
 check_PROGRAMS += tokenizer.test
 tokenizer_test_SOURCES = tokenizer_test.c test.h
 tokenizer_test_LDADD = libapfl.a
+
+TESTS += parser.test
+check_PROGRAMS += parser.test
+parser_test_SOURCES = parser_test.c test.h
+parser_test_LDADD = libapfl.a
diff --git a/src/parser_test.c b/src/parser_test.c
new file mode 100644
index 0000000..b0a1b89
--- /dev/null
+++ b/src/parser_test.c
@@ -0,0 +1,150 @@
+#include "apfl.h"
+
+#include "test.h"
+
+struct parser_test {
+    testctx t;
+    void *source_reader_ctx;
+    apfl_tokenizer_ptr tokenizer;
+    apfl_parser_ptr parser;
+};
+
+static struct parser_test *
+new_parser_test(testctx t, const char *source)
+{
+    struct parser_test *pt = must_alloc(t, sizeof(struct parser_test));
+    pt->t = t;
+    if ((pt->source_reader_ctx = apfl_string_source_reader_new(apfl_string_view_from(source))) == NULL) {
+        test_fatalf(t, "Failed initializing source reader");
+    }
+
+    if ((pt->tokenizer = apfl_tokenizer_new(apfl_string_source_reader, pt->source_reader_ctx)) == NULL) {
+        test_fatalf(t, "Failed initializing the tokenizer");
+    }
+
+    if ((pt->parser = apfl_parser_new(apfl_tokenizer_as_token_source(pt->tokenizer))) == NULL) {
+        test_fatalf(t, "Failed initializing the parser");
+    }
+
+    return pt;
+}
+
+static void
+destroy_parser_test(struct parser_test *pt)
+{
+    apfl_parser_destroy(pt->parser);
+    apfl_tokenizer_destroy(pt->tokenizer);
+    apfl_string_source_reader_destroy(pt->source_reader_ctx);
+    free(pt);
+}
+
+static void
+expect_eof(struct parser_test *pt)
+{
+    switch (apfl_parser_next(pt->parser)) {
+    case APFL_PARSE_OK:
+        test_fatalf(pt->t, "Expected EOF but got an expression");
+        break;
+    case APFL_PARSE_EOF:
+        break;
+    case APFL_PARSE_ERROR:
+        test_failf(pt->t, "Got an error instead of an EOF");
+        apfl_error_print(apfl_parser_get_error(pt->parser), stderr);
+        test_fatal(pt->t);
+        break;
+    }
+}
+
+static void
+expect_expr(struct parser_test *pt, struct apfl_expr expected)
+{
+    struct apfl_expr expr;
+
+    switch (apfl_parser_next(pt->parser)) {
+    case APFL_PARSE_OK:
+        expr = apfl_parser_get_expr(pt->parser);
+        if (!apfl_expr_eq(expr, expected)) {
+            test_failf(pt->t, "Expected expression differs from actual expression");
+            test_failf(pt->t, "Expected:");
+            apfl_expr_print(expected, stderr);
+            test_failf(pt->t, "Have:");
+            apfl_expr_print(expr, stderr);
+        }
+        apfl_expr_deinit(&expr);
+        apfl_expr_deinit(&expected);
+        break;
+    case APFL_PARSE_EOF:
+        test_fatalf(pt->t, "Extected an expression but got EOF");
+        break;
+    case APFL_PARSE_ERROR:
+        test_failf(pt->t, "Got an error instead of an EOF");
+        apfl_error_print(apfl_parser_get_error(pt->parser), stderr);
+        test_fatal(pt->t);
+        break;
+    }
+}
+
+static struct apfl_string
+new_string(struct parser_test *pt, const char *in)
+{
+    struct apfl_string out = { .bytes = NULL, .len = 0 };
+    if (!apfl_string_copy(&out, apfl_string_view_from(in))) {
+        test_fatalf(pt->t, "Failed copying string in new_string");
+    }
+    return out;
+}
+
+static void *
+new_helper(struct parser_test *pt, size_t size, void *data)
+{
+    void *out = must_alloc(pt->t, size);
+    memcpy(out, data, size);
+    return out;
+}
+
+// Fugly macros to make it a bit easier to create a heap allocated struct value
+#define BEGIN_NEW(pt, T) ((T *)new_helper(pt, sizeof(T), &((T)
+#define END_NEW )))
+
+TEST(empty, t) {
+    struct parser_test *pt = new_parser_test(t, "");
+    expect_eof(pt);
+    destroy_parser_test(pt);
+}
+
+TEST(hello_world, t) {
+    struct parser_test *pt = new_parser_test(t, "print \"Hello World!\"");
+    expect_expr(pt, (struct apfl_expr) {
+        .type = APFL_EXPR_CALL,
+        .position.line = 1,
+        .position.col = 1,
+        .call = (struct apfl_expr_call) {
+            .callee = BEGIN_NEW(pt, struct apfl_expr) {
+                .type = APFL_EXPR_VAR,
+                .position.line = 1,
+                .position.col = 1,
+                .var = new_string(pt, "print"),
+            } END_NEW,
+            .arguments = (struct apfl_expr_list) {
+                .len = 1,
+                .items = BEGIN_NEW(pt, struct apfl_expr_list_item) {
+                    .expand = false,
+                    .expr = BEGIN_NEW(pt, struct apfl_expr) {
+                        .type = APFL_EXPR_CONSTANT,
+                        .position.line = 1,
+                        .position.col = 7,
+                        .constant.type = APFL_EXPR_CONST_STRING,
+                        .constant.string = new_string(pt, "Hello World!"),
+                    } END_NEW,
+                } END_NEW,
+            },
+        },
+    });
+    expect_eof(pt);
+    destroy_parser_test(pt);
+}
+
+TESTS_BEGIN
+    ADDTEST(empty),
+    ADDTEST(hello_world),
+TESTS_END