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Merge pull request #4237 from snprajwal/str-withcapacity

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builtin(str): implement Str.withCapacity
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Ayaz 2022-10-08 14:31:30 -05:00 • committed by GitHub
commit 9d05bcd9d8
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11 changed files with 59 additions and 2 deletions
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1
crates/compiler/builtins/bitcode/src/main.zig
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@ -144,6 +144,7 @@ comptime {
exportStrFn(str.strTrimLeft, "trim_left");
exportStrFn(str.strTrimRight, "trim_right");
exportStrFn(str.strCloneTo, "clone_to");
exportStrFn(str.withCapacity, "with_capacity");
inline for (INTEGERS) |T| {
str.exportFromInt(T, ROC_BUILTINS ++ "." ++ STR ++ ".from_int.");

4
crates/compiler/builtins/bitcode/src/str.zig
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@ -2596,6 +2596,10 @@ pub fn reserve(string: RocStr, capacity: usize) callconv(.C) RocStr {
}
}
pub fn withCapacity(capacity: usize) callconv(.C) RocStr {
return RocStr.allocate(0, capacity);
}
pub fn getScalarUnsafe(string: RocStr, index: usize) callconv(.C) extern struct { bytesParsed: usize, scalar: u32 } {
const slice = string.asSlice();
const bytesParsed = @intCast(usize, std.unicode.utf8ByteSequenceLength(slice[index]) catch unreachable);

4
crates/compiler/builtins/roc/Str.roc
View file

@ -43,6 +43,7 @@ interface Str
appendScalar,
walkScalars,
walkScalarsUntil,
withCapacity,
]
imports [
Bool.{ Bool },
@ -144,6 +145,9 @@ Utf8Problem : { byteIndex : Nat, problem : Utf8ByteProblem }
isEmpty : Str -> Bool
concat : Str, Str -> Str
## Returns a string of the specified capacity without any content
withCapacity : Nat -> Str
## Combine a list of strings into a single string, with a separator
## string in between each.
##

1
crates/compiler/builtins/src/bitcode.rs
View file

@ -361,6 +361,7 @@ pub const STR_RESERVE: &str = "roc_builtins.str.reserve";
pub const STR_APPEND_SCALAR: &str = "roc_builtins.str.append_scalar";
pub const STR_GET_SCALAR_UNSAFE: &str = "roc_builtins.str.get_scalar_unsafe";
pub const STR_CLONE_TO: &str = "roc_builtins.str.clone_to";
pub const STR_WITH_CAPACITY: &str = "roc_builtins.str.with_capacity";
pub const LIST_MAP: &str = "roc_builtins.list.map";
pub const LIST_MAP2: &str = "roc_builtins.list.map2";