feat: make String iterable over code points with iterate/iteratorValue primitives

Add String as a subclass of Sequence in core.wren and implement the iterator protocol for strings in wren_core.c. The string_iterate native advances through UTF-8 code point boundaries, while string_iteratorValue extracts the full code point at a given byte index. Includes comprehensive test coverage for iteration, edge cases (empty strings, mid-sequence positions), and error handling for invalid iterator types and out-of-bounds indices. Also updates documentation for String, List, and Sequence classes with iterator protocol details and usage examples.

This commit is contained in:

Bob Nystrom

2015-01-23 04:58:22 +00:00

parent 7e52e36a1c

commit 488fb27b91

14 changed files with 141 additions and 21 deletions

test/string/iterate_iterator_not_int.wren

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				`@@ -0,0 +1 @@`
				`"s".iterate(1.5) // expect runtime error: Iterator must be an integer.`