is_ascii_letter (#418)

.github/workflows/linux.yml

@@ -24,7 +24,7 @@ jobs:
       - run: LLVM_CONFIG=llvm-config-${{ matrix.llvm-version }} make
       - run: ./runtests.sh --verbose --jou-flags "${{ matrix.opt-level }}"
       - run: ./runtests.sh --verbose --jou-flags "${{ matrix.opt-level }} --verbose"
-      # Valgrinding is slow, but many files affect valgrind resuls.
+      # Valgrinding is slow, but many files affect valgrind results.
       # We skip it when all changes are to .md files (docs, README etc)
       - name: Figure out if we need to run tests with valgrind
         id: check-need-valgrind

Makefile.posix

@@ -1,4 +1,4 @@
-# Linux has llvm-config-13, on macos brew installs LLVM to a weird place in /usr/local/
+# Linux has llvm-config-13/11, on macos brew installs LLVM to a weird place in /usr/local/
 LLVM_CONFIG ?= $(shell \
 	which llvm-config-13 \
 	|| which /usr/local/opt/llvm@13/bin/llvm-config \
@@ -20,7 +20,7 @@ compile_flags.txt:
 	echo "-I$(shell $(LLVM_CONFIG) --includedir)"  > compile_flags.txt
 
 config.h:
-	@v=`$(LLVM_CONFIG) --version`; case "$$v" in 11.*|13.*) ;; *) echo "Error: Found unsupported LLVM version $$v. Only LLVM 11 and LLVM 13 are supported."; exit 1; esac
+	@v=`$(LLVM_CONFIG) --version`; case "$$v" in 11.*|13.*) ;; *) echo "Error: Found unsupported LLVM version $$v. Only LLVM 11, 13 are supported."; exit 1; esac
 	echo "// auto-generated by Makefile" > config.h
 	echo "#define JOU_CLANG_PATH \"$(shell $(LLVM_CONFIG) --bindir)/clang\"" >> config.h
 

stdlib/ascii.jou

@@ -12,6 +12,10 @@ def is_ascii(s: byte*) -> bool:
 def is_ascii_digit(b: byte) -> bool:
     return '0' <= b and b <= '9'
 
+# Check for 'a-z' 'A-Z'
+def is_ascii_letter(b: byte) -> bool:
+    return ('A' <= b and b <= 'Z') or ('a' <= b and b <= 'z')
+
 # Checks if the given byte is an ASCII punctuation character, such as '*' or '_' or '"'.
 def is_ascii_punctuation(b: byte) -> bool:
     return b != '\0' and strchr("!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~", b) != NULL
@@ -35,7 +39,6 @@ def trim_ascii_whitespace(s: byte*) -> void:
         memmove(s, start, len)
     s[len] = '\0'
 
-
 # Finds all non-whitespace parts of a string.
 # For example:  " foo bar  baz \n" --> ["foo", "bar", "baz", NULL]
 #

tests/should_succeed/ascii_test.jou

@@ -13,6 +13,14 @@ def main() -> int:
     assert not is_ascii_digit('x')
     assert not is_ascii_digit('\0')
 
+    assert is_ascii_letter('A')
+    assert is_ascii_letter('Z')
+    assert is_ascii_letter('a')
+    assert is_ascii_letter('z')
+    assert not is_ascii_letter('\0')
+    assert not is_ascii_letter('\\')
+    assert not is_ascii_letter('\n')
+
     assert is_ascii_punctuation('!')
     assert is_ascii_punctuation('_')
     assert not is_ascii_punctuation('a')