make-tables.php

Go to the documentation of this file.

#!/usr/bin/php
<?php
 
if ( PHP_SAPI !== 'cli' && PHP_SAPI !== 'phpdbg' ) {
    die( "This script may only be executed from the command line.\n" );
}
 
$chars = [];
for ( $i = 0; $i <= 0x10ffff; $i++ ) {
    if ( $i < 0xd800 || $i > 0xdfff ) { // Skip UTF-16 surrogates
        $chars[$i] = mb_convert_encoding( pack( 'N', $i ), 'UTF-8', 'UTF-32BE' );
    }
}
 
### Uppercase and Lowercase mappings
echo "Creating upper and lower tables...\n";
$L = fopen( __DIR__ . '/lower.lua', 'w' );
if ( !$L ) {
    die( "Failed to open lower.lua\n" );
}
$U = fopen( __DIR__ . '/upper.lua', 'w' );
if ( !$U ) {
    die( "Failed to open upper.lua\n" );
}
fprintf( $L, "-- This file is automatically generated by make-tables.php\n" );
fprintf( $L, "return {\n" );
fprintf( $U, "-- This file is automatically generated by make-tables.php\n" );
fprintf( $U, "return {\n" );
foreach ( $chars as $i => $c ) {
    $l = mb_strtolower( $c, 'UTF-8' );
    $u = mb_strtoupper( $c, 'UTF-8' );
    if ( $c !== $l ) {
        fprintf( $L, "\t[\"%s\"] = \"%s\",\n", $c, $l );
    }
    if ( $c !== $u ) {
        fprintf( $U, "\t[\"%s\"] = \"%s\",\n", $c, $u );
    }
}
fprintf( $L, "}\n" );
fprintf( $U, "}\n" );
fclose( $L );
fclose( $U );
 
### Pattern code mappings
echo "Creating charsets table...\n";
$fh = fopen( __DIR__ . '/charsets.lua', 'w' );
if ( !$fh ) {
    die( "Failed to open charsets.lua\n" );
}
$pats = [
    // These should match the expressions in UstringLibrary::patternToRegex()
    'a' => [ '\p{L}', 'lu' ],
    'c' => [ '\p{Cc}', null ],
    'd' => [ '\p{Nd}', null ],
    'l' => [ '\p{Ll}', null ],
    'p' => [ '\p{P}', null ],
    's' => [ '\p{Xps}', null ],
    'u' => [ '\p{Lu}', null ],
    'w' => [ null, 'da' ], # '[\p{L}\p{Nd}]' exactly matches 'a' + 'd'
    'x' => [ '[0-9A-Fa-f０-９Ａ-Ｆａ-ｆ]', null ],
    'z' => [ '\0', null ],
];
 
$ranges = [];
// @codingStandardsIgnoreLine MediaWiki.NamingConventions.PrefixedGlobalFunctions
function addRange( $k, $start, $end ) {
    // @codingStandardsIgnoreLine MediaWiki.NamingConventions.ValidGlobalName
    global $fh, $ranges;
    // Speed/memory tradeoff
    if ( !( $start >= 0x20 && $start < 0x7f ) && $end - $start >= 10 ) {
        $ranges[$k][] = sprintf( "c >= 0x%06x and c < 0x%06x", $start, $end );
    } else {
        for ( $i = $start; $i < $end; $i++ ) {
            fprintf( $fh, "\t\t[0x%06x] = 1,\n", $i );
        }
    }
}
 
fprintf( $fh, "-- This file is automatically generated by make-tables.php\n" );
fprintf( $fh, "local pats = {\n" );
foreach ( $pats as $k => $pp ) {
    $ranges[$k] = [];
    $re = $pp[0];
    if ( !$re ) {
        fprintf( $fh, "\t[0x%02x] = {},\n", ord( $k ) );
        continue;
    }
 
    $re2 = 'fail';
    if ( $pp[1] ) {
        $re2 = [];
        foreach ( str_split( $pp[1] ) as $p ) {
            $re2[] = $pats[$p][0];
        }
        $re2 = implode( '|', $re2 );
    }
 
    fprintf( $fh, "\t[0x%02x] = {\n", ord( $k ) );
    $rstart = null;
    foreach ( $chars as $i => $c ) {
        if ( preg_match( "/^$re$/u", $c ) && !preg_match( "/^$re2$/u", $c ) ) {
            if ( $rstart === null ) {
                $rstart = $i;
            }
        } else {
            if ( $rstart !== null ) {
                addRange( $k, $rstart, $i );
                $rstart = null;
            }
        }
    }
    if ( $rstart !== null ) {
        addRange( $k, $rstart, 0x110000 );
    }
    fprintf( $fh, "\t},\n" );
}
foreach ( $pats as $k => $pp ) {
    $kk = strtoupper( $k );
    fprintf( $fh, "\t[0x%02x] = {},\n", ord( $kk ) );
}
fprintf( $fh, "}\n" );
foreach ( $pats as $k => $pp ) {
    $body = '';
    $check = [];
    if ( $pp[1] ) {
        foreach ( str_split( $pp[1] ) as $p ) {
            $check[] = sprintf( "pats[0x%02x][k]", ord( $p ) );
        }
    }
    if ( $ranges[$k] ) {
        $body = "\tlocal c = tonumber( k ) or 0/0;\n";
        $check = array_merge( $check, $ranges[$k] );
    }
    if ( $check ) {
        $body .= "\treturn " . implode( " or\n\t\t", $check );
        fprintf( $fh, "setmetatable( pats[0x%02x], { __index = function ( t, k )\n%s\nend } )\n",
            ord( $k ), $body );
    }
}
foreach ( $pats as $k => $pp ) {
    fprintf( $fh, "setmetatable( pats[0x%02x], { ", ord( strtoupper( $k ) ) );
    fprintf( $fh, "__index = function ( t, k ) return k and not pats[0x%02x][k] end", ord( $k ) );
    fprintf( $fh, " } )\n" );
}
fprintf( $fh, "\n-- For speed, cache printable ASCII characters in main tables\n" );
fprintf( $fh, "for k, t in pairs( pats ) do\n" );
fprintf( $fh, "\tif k >= 0x61 then\n" );
fprintf( $fh, "\t\tfor i = 0x20, 0x7e do\n" );
fprintf( $fh, "\t\t\tt[i] = t[i] or false\n" );
fprintf( $fh, "\t\tend\n" );
fprintf( $fh, "\tend\n" );
fprintf( $fh, "end\n" );
fprintf( $fh, "\nreturn pats\n" );
fclose( $fh );