More strings#73
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New string functions to remove whitespace from strings: - TRIM$(str$) removes leading and trailing spaces/tabs - LTRIM$(str$) removes leading spaces/tabs only - RTRIM$(str$) removes trailing spaces/tabs only Implementation: 3 new enum symbols, rword[] entries, code gen cases in basfun.c, and 68000 assembly runtime in new string2.s module. Verified on emulator: all 7 ASSERT tests pass. Co-Authored-By: Claude Opus 4.6 <[email protected]>
New functions for string searching and matching: - STARTSWITH(str$, prefix$) returns -1 if str$ begins with prefix$ - ENDSWITH(str$, suffix$) returns -1 if str$ ends with suffix$ - RINSTR([offset,] str$, find$) reverse search, returns last position All return LONG type. Assembly runtime in string2.s. Verified on emulator: all ASSERT tests pass (Phase 1 trim + Phase 2 search). Co-Authored-By: Claude Opus 4.6 <[email protected]>
New string transformation functions: - REPLACE$(str$, find$, repl$) replaces all occurrences of find$ with repl$ - REVERSE$(str$) reverses a string - REPEAT$(str$, count) repeats a string N times Assembly runtime in string2.s with MAXSTRINGSIZE bounds checking. Verified on emulator: all ASSERT tests pass (Phases 1-3). Co-Authored-By: Claude Opus 4.6 <[email protected]>
New string padding functions: - LPAD$(str$, width, pad$) left-pads to target width with pad character - RPAD$(str$, width, pad$) right-pads to target width with pad character Both use first character of pad$ string. If str$ is already >= width, returns str$ unchanged. Assembly runtime in string2.s. Verified on emulator: all ASSERT tests pass (Phases 1-4). Co-Authored-By: Claude Opus 4.6 <[email protected]>
FMT$(format$, arg1, arg2, ...) supports up to 8 arguments: - %d/%ld for decimal integers - %x/%lx for hexadecimal (uppercase on Amiga platform) - %s for string interpolation - %c for single character - %% for literal percent - Width/padding modifiers (e.g., %08x) Implementation: special varargs codegen stores args in BSS buffer, assembly state machine in string2.s walks format string, delegates integer formatting to _sprintf. Verified on emulator: all 8 ASSERT tests pass. Co-Authored-By: Claude Opus 4.6 <[email protected]>
Extends existing MID$ function with a statement form: MID$(x$, pos[, len]) = rhs$ that overwrites bytes in a string variable in-place, matching standard BASIC dialects. Co-Authored-By: Claude Opus 4.6 <[email protected]>
37 new assertions covering: LTRIM$/RTRIM$ empty/whitespace/tabs, STARTSWITH/ENDSWITH exact match and empty strings, RINSTR edge cases, REPEAT$ empty source, REPLACE$ start/end/consecutive, REVERSE$ two chars, LPAD$/RPAD$ empty strings, FMT$ negative int/multi strings/empty format, MID$ statement pos=1/capped rhs/empty rhs/pos beyond end. Co-Authored-By: Claude Opus 4.6 <[email protected]>
…tegory Add ref.txt entries for ENDSWITH, FMT$, LPAD$, LTRIM$, REPEAT$, REPLACE$, REVERSE$, RINSTR, RPAD$, RTRIM$, STARTSWITH, TRIM$, and update MID$ with statement form. Add corresponding quickref.txt entries. Move 9 string-related test files from syntax/ to strings/ category: case_convert, fmt_func, lcase, mid_stmt, pad_funcs, search_funcs, transform_funcs, trim, ucase. Co-Authored-By: Claude Opus 4.6 <[email protected]>
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