Add pangram exercise (#72)

config.json

@@ -82,6 +82,14 @@
         "prerequisites": [],
         "difficulty": 3
       },
+      {
+        "slug": "pangram",
+        "name": "Pangram",
+        "uuid": "cc8d6b7d-9745-4cd1-a1d4-a6b184bdf00d",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 3
+      },
       {
         "slug": "square-root",
         "name": "Square Root",

exercises/practice/pangram/.docs/instructions.md

@@ -0,0 +1,8 @@
+# Instructions
+
+Your task is to figure out if a sentence is a pangram.
+
+A pangram is a sentence using every letter of the alphabet at least once.
+It is case insensitive, so it doesn't matter if a letter is lower-case (e.g. `k`) or upper-case (e.g. `K`).
+
+For this exercise, a sentence is a pangram if it contains each of the 26 letters in the English alphabet.

exercises/practice/pangram/.docs/introduction.md

@@ -0,0 +1,16 @@
+# Introduction
+
+You work for a company that sells fonts through their website.
+They'd like to show a different sentence each time someone views a font on their website.
+To give a comprehensive sense of the font, the random sentences should use **all** the letters in the English alphabet.
+
+They're running a competition to get suggestions for sentences that they can use.
+You're in charge of checking the submissions to see if they are valid.
+
+~~~~exercism/note
+Pangram comes from Greek, παν γράμμα, pan gramma, which means "every letter".
+
+The best known English pangram is:
+
+> The quick brown fox jumps over the lazy dog.
+~~~~

exercises/practice/pangram/.meta/config.json

@@ -0,0 +1,19 @@
+{
+  "authors": [
+    "keiravillekode"
+  ],
+  "files": {
+    "solution": [
+      "pangram.s"
+    ],
+    "test": [
+      "pangram_test.c"
+    ],
+    "example": [
+      ".meta/example.s"
+    ]
+  },
+  "blurb": "Determine if a sentence is a pangram.",
+  "source": "Wikipedia",
+  "source_url": "https://en.wikipedia.org/wiki/Pangram"
+}

exercises/practice/pangram/.meta/example.s

@@ -0,0 +1,26 @@
+.text
+.globl is_pangram
+
+/* extern int is_pangram(const char *sentence); */
+is_pangram:
+        mov     x1, x0
+        mov     x0, #0                  /* bitset of letters */
+        mov     x2, #1
+
+.loop:
+        ldrb    w3, [x1], #1            /* load byte, with post-increment */
+        cbz     x3, .return
+
+        orr     x3, x3, #32             /* force lower-case */
+        sub     x3, x3, #97
+        cmp     x3, #26
+        bhs     .loop                   /* unsigned >= */
+
+        lsl     x3, x2, x3              /* 1 << (letter - 'a') */
+        orr     x0, x0, x3
+        b       .loop
+
+.return:
+        add     x0, x0, #1              /* 2**26 iff sentence contains all letters */
+        lsr     x0, x0, #26
+        ret

exercises/practice/pangram/.meta/tests.toml

@@ -0,0 +1,45 @@
+# 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.
+
+[64f61791-508e-4f5c-83ab-05de042b0149]
+description = "empty sentence"
+
+[74858f80-4a4d-478b-8a5e-c6477e4e4e84]
+description = "perfect lower case"
+
+[61288860-35ca-4abe-ba08-f5df76ecbdcd]
+description = "only lower case"
+
+[6564267d-8ac5-4d29-baf2-e7d2e304a743]
+description = "missing the letter 'x'"
+
+[c79af1be-d715-4cdb-a5f2-b2fa3e7e0de0]
+description = "missing the letter 'h'"
+
+[d835ec38-bc8f-48e4-9e36-eb232427b1df]
+description = "with underscores"
+
+[8cc1e080-a178-4494-b4b3-06982c9be2a8]
+description = "with numbers"
+
+[bed96b1c-ff95-45b8-9731-fdbdcb6ede9a]
+description = "missing letters replaced by numbers"
+
+[938bd5d8-ade5-40e2-a2d9-55a338a01030]
+description = "mixed case and punctuation"
+
+[2577bf54-83c8-402d-a64b-a2c0f7bb213a]
+description = "case insensitive"
+include = false
+
+[7138e389-83e4-4c6e-8413-1e40a0076951]
+description = "a-m and A-M are 26 different characters but not a pangram"
+reimplements = "2577bf54-83c8-402d-a64b-a2c0f7bb213a"

exercises/practice/pangram/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/pangram/pangram.s

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

exercises/practice/pangram/pangram_test.c

@@ -0,0 +1,73 @@
+#include "vendor/unity.h"
+
+extern int is_pangram(const char *sentence);
+
+void setUp(void) {
+}
+
+void tearDown(void) {
+}
+
+void test_empty_sentence(void) {
+    TEST_ASSERT_FALSE(is_pangram(""));
+}
+
+void test_perfect_lower_case(void) {
+    TEST_IGNORE();
+    TEST_ASSERT_TRUE(is_pangram("abcdefghijklmnopqrstuvwxyz"));
+}
+
+void test_only_lower_case(void) {
+    TEST_IGNORE();
+    TEST_ASSERT_TRUE(is_pangram("the quick brown fox jumps over the lazy dog"));
+}
+
+void test_missing_the_letter_x(void) {
+    TEST_IGNORE();
+    TEST_ASSERT_FALSE(is_pangram("a quick movement of the enemy will jeopardize five gunboats"));
+}
+
+void test_missing_the_letter_h(void) {
+    TEST_IGNORE();
+    TEST_ASSERT_FALSE(is_pangram("five boxing wizards jump quickly at it"));
+}
+
+void test_with_underscores(void) {
+    TEST_IGNORE();
+    TEST_ASSERT_TRUE(is_pangram("the_quick_brown_fox_jumps_over_the_lazy_dog"));
+}
+
+void test_with_numbers(void) {
+    TEST_IGNORE();
+    TEST_ASSERT_TRUE(is_pangram("the 1 quick brown fox jumps over the 2 lazy dogs"));
+}
+
+void test_missing_letters_replaced_by_numbers(void) {
+    TEST_IGNORE();
+    TEST_ASSERT_FALSE(is_pangram("7h3 qu1ck brown fox jumps ov3r 7h3 lazy dog"));
+}
+
+void test_mixed_case_and_punctuation(void) {
+    TEST_IGNORE();
+    TEST_ASSERT_TRUE(is_pangram("\"Five quacking Zephyrs jolt my wax bed.\""));
+}
+
+void test_am_and_am_are_26_different_characters_but_not_a_pangram(void) {
+    TEST_IGNORE();
+    TEST_ASSERT_FALSE(is_pangram("abcdefghijklm ABCDEFGHIJKLM"));
+}
+
+int main(void) {
+    UNITY_BEGIN();
+    RUN_TEST(test_empty_sentence);
+    RUN_TEST(test_perfect_lower_case);
+    RUN_TEST(test_only_lower_case);
+    RUN_TEST(test_missing_the_letter_x);
+    RUN_TEST(test_missing_the_letter_h);
+    RUN_TEST(test_with_underscores);
+    RUN_TEST(test_with_numbers);
+    RUN_TEST(test_missing_letters_replaced_by_numbers);
+    RUN_TEST(test_mixed_case_and_punctuation);
+    RUN_TEST(test_am_and_am_are_26_different_characters_but_not_a_pangram);
+    return UNITY_END();
+}