feat(phase-16): Complete string.format with width/precision#136
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davydog187 merged 2 commits intomainfrom Feb 12, 2026
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feat(phase-16): Complete string.format with width/precision#136davydog187 merged 2 commits intomainfrom
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Rewrite string.format to support full Lua 5.3 format specifiers: - Flags: -, +, space, 0, # - Width and precision modifiers - New specifiers: %g, %G, %e, %E, %u Implements Phase 16 from plan.md
Add 15 property tests covering string.format: Integer formatting: - %d produces correct integer strings - %d truncates floats to integers - %x produces valid lowercase hex (round-trips through Integer.parse) - %X produces valid uppercase hex (round-trips through Integer.parse) - %o produces valid octal (round-trips through Integer.parse) String/char formatting: - %s returns the original string - %c produces single byte for values 0-127 - %% always produces literal percent - %.ns truncates string to at most n characters Width/precision: - Width specifier pads to at least width characters - Left-justify flag makes result left-aligned - Zero-pad flag fills with zeros - %.nf produces exactly n decimal places Scientific notation: - %e always contains e+/e- notation - %E always contains E+/E- notation Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
%[flags][width][.precision]specifier%g/%G(general),%e/%E(scientific),%u(unsigned)%5d,%-10s,%.2f,%05d,%02xTest plan
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