Add isogram exercise

config.json

@@ -82,6 +82,14 @@
         "prerequisites": [],
         "difficulty": 3
       },
+      {
+        "slug": "isogram",
+        "name": "Isogram",
+        "uuid": "3dd7530f-fe11-4e3e-99df-47a893040cd8",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 3
+      },
       {
         "slug": "pangram",
         "name": "Pangram",

exercises/practice/isogram/.docs/instructions.md

@@ -0,0 +1,14 @@
+# Instructions
+
+Determine if a word or phrase is an isogram.
+
+An isogram (also known as a "non-pattern word") is a word or phrase without a repeating letter, however spaces and hyphens are allowed to appear multiple times.
+
+Examples of isograms:
+
+- lumberjacks
+- background
+- downstream
+- six-year-old
+
+The word _isograms_, however, is not an isogram, because the s repeats.

exercises/practice/isogram/.meta/config.json

@@ -0,0 +1,19 @@
+{
+  "authors": [
+    "keiravillekode"
+  ],
+  "files": {
+    "solution": [
+      "isogram.s"
+    ],
+    "test": [
+      "isogram_test.c"
+    ],
+    "example": [
+      ".meta/example.s"
+    ]
+  },
+  "blurb": "Determine if a word or phrase is an isogram.",
+  "source": "Wikipedia",
+  "source_url": "https://en.wikipedia.org/wiki/Isogram"
+}

exercises/practice/isogram/.meta/example.s

@@ -0,0 +1,32 @@
+.text
+.globl is_isogram
+
+/* extern int is_isogram(const char *phrase); */
+is_isogram:
+        mov     x1, x0
+        mov     x0, #0                  /* bitset of letters */
+        mov     x2, #1
+
+.loop:
+        ldrb    w3, [x1], #1            /* load byte, with post-increment */
+        cbz     x3, .accept
+
+        orr     x3, x3, #32             /* force lower-case */
+        sub     x3, x3, #97
+        cmp     x3, #26
+        bhs     .loop                   /* unsigned >= */
+
+        lsl     x3, x2, x3              /* 1 << (letter - 'a') */
+        tst     x0, x3
+        bne     .reject
+
+        orr     x0, x0, x3
+        b       .loop
+
+.accept:
+        mov     x0, #1
+        ret
+
+.reject:
+        mov     x0, #0
+        ret

exercises/practice/isogram/.meta/tests.toml

@@ -0,0 +1,52 @@
+# This is an auto-generated file.
+#
+# Regenerating this file via `configlet sync` will:
+# - Recreate every `description` key/value pair
+# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
+# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
+# - Preserve any other key/value pair
+#
+# As user-added comments (using the # character) will be removed when this file
+# is regenerated, comments can be added via a `comment` key.
+
+[a0e97d2d-669e-47c7-8134-518a1e2c4555]
+description = "empty string"
+
+[9a001b50-f194-4143-bc29-2af5ec1ef652]
+description = "isogram with only lower case characters"
+
+[8ddb0ca3-276e-4f8b-89da-d95d5bae78a4]
+description = "word with one duplicated character"
+
+[6450b333-cbc2-4b24-a723-0b459b34fe18]
+description = "word with one duplicated character from the end of the alphabet"
+
+[a15ff557-dd04-4764-99e7-02cc1a385863]
+description = "longest reported english isogram"
+
+[f1a7f6c7-a42f-4915-91d7-35b2ea11c92e]
+description = "word with duplicated character in mixed case"
+
+[14a4f3c1-3b47-4695-b645-53d328298942]
+description = "word with duplicated character in mixed case, lowercase first"
+
+[423b850c-7090-4a8a-b057-97f1cadd7c42]
+description = "hypothetical isogrammic word with hyphen"
+
+[93dbeaa0-3c5a-45c2-8b25-428b8eacd4f2]
+description = "hypothetical word with duplicated character following hyphen"
+
+[36b30e5c-173f-49c6-a515-93a3e825553f]
+description = "isogram with duplicated hyphen"
+
+[cdabafa0-c9f4-4c1f-b142-689c6ee17d93]
+description = "made-up name that is an isogram"
+
+[5fc61048-d74e-48fd-bc34-abfc21552d4d]
+description = "duplicated character in the middle"
+
+[310ac53d-8932-47bc-bbb4-b2b94f25a83e]
+description = "same first and last characters"
+
+[0d0b8644-0a1e-4a31-a432-2b3ee270d847]
+description = "word with duplicated character and with two hyphens"

exercises/practice/isogram/Makefile

@@ -0,0 +1,36 @@
+AS = aarch64-linux-gnu-as
+CC = aarch64-linux-gnu-gcc
+
+CFLAGS = -g -Wall -Wextra -pedantic -Werror
+LDFLAGS =
+
+ALL_LDFLAGS = -pie -Wl,--fatal-warnings
+
+ALL_CFLAGS = -std=c99 -fPIE $(CFLAGS)
+ALL_LDFLAGS += $(LDFLAGS)
+
+C_OBJS = $(patsubst %.c,%.o,$(wildcard *.c))
+AS_OBJS = $(patsubst %.s,%.o,$(wildcard *.s))
+ALL_OBJS = $(filter-out example.o,$(C_OBJS) $(AS_OBJS) vendor/unity.o)
+
+CC_CMD = $(CC) $(ALL_CFLAGS) -c -o $@ $<
+
+all: tests
+	qemu-aarch64 -L /usr/aarch64-linux-gnu ./$<
+
+tests: $(ALL_OBJS)
+	@$(CC) $(ALL_CFLAGS) $(ALL_LDFLAGS) -o $@ $(ALL_OBJS)
+
+%.o: %.s
+	@$(AS) -o $@ $<
+
+%.o: %.c
+	@$(CC_CMD)
+
+vendor/unity.o: vendor/unity.c vendor/unity.h vendor/unity_internals.h
+	@$(CC_CMD)
+
+clean:
+	@rm -f *.o vendor/*.o tests
+
+.PHONY: all clean

exercises/practice/isogram/isogram.s

@@ -0,0 +1,5 @@
+.text
+.globl is_isogram
+
+is_isogram:
+    ret

exercises/practice/isogram/isogram_test.c

@@ -0,0 +1,97 @@
+#include "vendor/unity.h"
+
+extern int is_isogram(const char *phrase);
+
+void setUp(void) {
+}
+
+void tearDown(void) {
+}
+
+void test_empty_string(void) {
+    TEST_ASSERT_TRUE(is_isogram(""));
+}
+
+void test_isogram_with_only_lower_case_characters(void) {
+    TEST_IGNORE();
+    TEST_ASSERT_TRUE(is_isogram("isogram"));
+}
+
+void test_word_with_one_duplicated_character(void) {
+    TEST_IGNORE();
+    TEST_ASSERT_FALSE(is_isogram("eleven"));
+}
+
+void test_word_with_one_duplicated_character_from_the_end_of_the_alphabet(void) {
+    TEST_IGNORE();
+    TEST_ASSERT_FALSE(is_isogram("zzyzx"));
+}
+
+void test_longest_reported_english_isogram(void) {
+    TEST_IGNORE();
+    TEST_ASSERT_TRUE(is_isogram("subdermatoglyphic"));
+}
+
+void test_word_with_duplicated_character_in_mixed_case(void) {
+    TEST_IGNORE();
+    TEST_ASSERT_FALSE(is_isogram("Alphabet"));
+}
+
+void test_word_with_duplicated_character_in_mixed_case_lowercase_first(void) {
+    TEST_IGNORE();
+    TEST_ASSERT_FALSE(is_isogram("alphAbet"));
+}
+
+void test_hypothetical_isogrammic_word_with_hyphen(void) {
+    TEST_IGNORE();
+    TEST_ASSERT_TRUE(is_isogram("thumbscrew-japingly"));
+}
+
+void test_hypothetical_word_with_duplicated_character_following_hyphen(void) {
+    TEST_IGNORE();
+    TEST_ASSERT_FALSE(is_isogram("thumbscrew-jappingly"));
+}
+
+void test_isogram_with_duplicated_hyphen(void) {
+    TEST_IGNORE();
+    TEST_ASSERT_TRUE(is_isogram("six-year-old"));
+}
+
+void test_madeup_name_that_is_an_isogram(void) {
+    TEST_IGNORE();
+    TEST_ASSERT_TRUE(is_isogram("Emily Jung Schwartzkopf"));
+}
+
+void test_duplicated_character_in_the_middle(void) {
+    TEST_IGNORE();
+    TEST_ASSERT_FALSE(is_isogram("accentor"));
+}
+
+void test_same_first_and_last_characters(void) {
+    TEST_IGNORE();
+    TEST_ASSERT_FALSE(is_isogram("angola"));
+}
+
+void test_word_with_duplicated_character_and_with_two_hyphens(void) {
+    TEST_IGNORE();
+    TEST_ASSERT_FALSE(is_isogram("up-to-date"));
+}
+
+int main(void) {
+    UNITY_BEGIN();
+    RUN_TEST(test_empty_string);
+    RUN_TEST(test_isogram_with_only_lower_case_characters);
+    RUN_TEST(test_word_with_one_duplicated_character);
+    RUN_TEST(test_word_with_one_duplicated_character_from_the_end_of_the_alphabet);
+    RUN_TEST(test_longest_reported_english_isogram);
+    RUN_TEST(test_word_with_duplicated_character_in_mixed_case);
+    RUN_TEST(test_word_with_duplicated_character_in_mixed_case_lowercase_first);
+    RUN_TEST(test_hypothetical_isogrammic_word_with_hyphen);
+    RUN_TEST(test_hypothetical_word_with_duplicated_character_following_hyphen);
+    RUN_TEST(test_isogram_with_duplicated_hyphen);
+    RUN_TEST(test_madeup_name_that_is_an_isogram);
+    RUN_TEST(test_duplicated_character_in_the_middle);
+    RUN_TEST(test_same_first_and_last_characters);
+    RUN_TEST(test_word_with_duplicated_character_and_with_two_hyphens);
+    return UNITY_END();
+}