pcbjam/wasm/cli/sym_convert_pre.js

// Host shims for the standalone sym_convert node CLI (emscripten --pre-js).
//
// KiCad's wxWidgets wasm port reads/writes settings through wxConfig, which
// bridges to JS hooks (getConfigEntryLength, …). The web editor provides those
// via wx.js, backed by the browser's localStorage. The headless converter has no
// browser/localStorage and needs no persisted settings, so we back the same hooks
// with an in-memory store: every read returns "absent" → KiCad falls back to
// defaults; writes live only for the process lifetime. Semantics mirror
// wxwidgets/build/wasm/wx.js exactly (sans persistence).
// Emscripten does NOT inherit the host environment into the wasm getenv()
// table (node included) — without this, KICAD_CONFIG_HOME / SYM_CONVERT_TRACE
// set by the caller silently never arrive. Copy process.env in before main.
Module['preRun'] = Module['preRun'] || [];
Module['preRun'].push( function() {
  if( typeof process !== 'undefined' && process.env && typeof ENV !== 'undefined' )
  {
    for( var k in process.env ) ENV[k] = process.env[k];
  }
} );

(function( g ) {
  if( !g.localStorage )
  {
    var store = new Map();
    g.localStorage = {
      get length() { return store.size; },
      key: function( i ) { var k = Array.from( store.keys() )[i]; return k === undefined ? null : k; },
      getItem: function( k ) { return store.has( k ) ? store.get( k ) : null; },
      setItem: function( k, v ) { store.set( String( k ), String( v ) ); },
      removeItem: function( k ) { store.delete( k ); },
      clear: function() { store.clear(); },
    };
  }

  var ls = g.localStorage;

  // Only reached once a stored value exists; with the empty in-memory store these
  // never run, but keep them correct in case settings are written then read back.
  var s2u = function( str, buf, len ) {
    var f = g.stringToUTF8 || ( g.Module && g.Module.stringToUTF8 );
    f( str, buf, len );
  };

  g.hasConfigEntry = function( key ) { return ls.getItem( key ) !== null; };

  g.hasConfigGroup = function( key ) {
    for( var i = 0; i < ls.length; i++ ) if( ls.key( i ).startsWith( key ) ) return true;
    return false;
  };

  g.getConfigEntryCount = function( prefix, recurse ) {
    var n = 0;
    for( var i = 0; i < ls.length; i++ ) {
      var key = ls.key( i );
      if( key.startsWith( prefix ) ) {
        var end = key.indexOf( '/', prefix.length );
        if( end == -1 || recurse ) ++n;
      }
    }
    return n;
  };

  g.getConfigEntryIndex = function( prefix, index ) {
    var n = 0;
    for( var i = 0; i < ls.length; i++ ) {
      var key = ls.key( i );
      if( key.startsWith( prefix ) ) {
        var end = key.indexOf( '/', prefix.length );
        if( end == -1 ) { if( n >= index ) return i; else ++n; }
      }
    }
    return -1;
  };

  g.getConfigGroupCount = function( prefix, recurse ) {
    var c = new Set();
    for( var i = 0; i < ls.length; i++ ) {
      var key = ls.key( i );
      if( key.startsWith( prefix ) ) {
        var end = key.indexOf( '/', prefix.length );
        if( end != -1 ) { if( recurse ) end = key.lastIndexOf( '/' ); c.add( key.substring( prefix.length, end ) ); }
      }
    }
    return c.size;
  };

  g.getConfigGroupIndex = function( prefix, index ) {
    var c = new Set();
    for( var i = 0; i < ls.length; i++ ) {
      var key = ls.key( i );
      if( key.startsWith( prefix ) ) {
        var end = key.indexOf( '/', prefix.length );
        if( end != -1 ) {
          var child = key.substring( prefix.length, end );
          if( !c.has( child ) ) { if( c.size >= index ) return i; else c.add( child ); }
        }
      }
    }
    return -1;
  };

  g.getConfigKeyLength = function( index ) { var k = ls.key( index ); return k ? k.length : 0; };
  g.getConfigKey = function( index, buf, len ) { s2u( ls.key( index ), buf, len ); };

  g.getConfigEntryLength = function( key ) { var v = ls.getItem( key ); return v === null ? -1 : v.length; };
  g.getConfigEntry = function( key, buf, len ) {
    var v = ls.getItem( key );
    if( v !== null ) { s2u( v, buf, len ); return true; }
    return false;
  };

  g.setConfigEntry = function( key, value ) { ls.setItem( key, value ); };

  g.renameConfigGroup = function( oldG, newG ) {
    var keys = [];
    for( var i = 0; i < ls.length; i++ ) {
      var key = ls.key( i );
      if( key.startsWith( oldG ) ) keys.push( key );
      else if( key.startsWith( newG ) ) return false;
    }
    for( var j = 0; j < keys.length; j++ ) {
      var nk = newG + keys[j].substring( oldG.length );
      ls.setItem( nk, ls.getItem( keys[j] ) ); ls.removeItem( keys[j] );
    }
    return keys.length > 0;
  };
})( typeof globalThis !== 'undefined' ? globalThis : this );