convert python % string formatting to v interpolation#41
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medvednikov merged 1 commit intovlang:masterfrom Feb 20, 2026
Merged
convert python % string formatting to v interpolation#41medvednikov merged 1 commit intovlang:masterfrom
medvednikov merged 1 commit intovlang:masterfrom
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add convert_percent_format() in helpers.v that parses Python % format specifiers and emits V string interpolation with correct format specs. handles %s, %d/%i, %f/%F, %e/%E, %g/%G, %x/%X, %o, and %% (literal). preserves Python default precision (6 decimal places for bare %f/%e). left-align flag overrides zero-pad (%-05d -> :-5, not :0-5). bare dot precision means 0 (%.f -> :.0f, not default 6). integer modulo (int % int) passes through correctly. in transpiler.v, visit_binop detects Mod with string Constant on the left side and routes to convert_percent_format instead of raw %. 109 pass, 0 fail, 0 skip (v 0.5.0 a9423b5)
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Converts Python
%string formatting expressions to V string interpolationwith correct format specifiers.
Changes
convert_percent_format()inhelpers.v: parses Python%formatspecifiers (
%s,%d,%f,%e,%g,%x,%o,%%) and emits Vinterpolation with correct format specs
%f/%e)%-05d->:-5)%.f->:.0f)visit_binop()intranspiler.v: detectsModwith stringConstanton left side and routes to format conversion instead of raw
%10 % 3) passes through correctlyTest plan
string_format_percentcovers:%s,%d,%.2f,%05d,%x, multi-value tuple,%%, default%f,%.f,%-05d, integer modulo