52 lines
2.3 KiB
JavaScript
52 lines
2.3 KiB
JavaScript
#!/usr/bin/env node
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var argv = process.argv.slice(1), fs = require('fs');
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if(argv.length < 2) {
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console.error("usage: make.njs <codepage_index> [variable]");
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process.exit(22); /* EINVAL */
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}
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var cp/*:string*/ = argv[1];
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var jsvar/*:string*/ = argv[2] || "cptable";
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var x/*:string*/ = fs.readFileSync("codepages/" + cp + ".TBL","utf8");
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var maxcp = 0, i = 0, ii = 0;
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var y/*:Array<Array<number> >*/ = x.split("\n").map(function(z/*:string*/)/*:Array<number>*/ {
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var w/*:Array<string>*/ = z.split("\t");
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if(w.length < 2) return [Number(w[0])];
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return [Number(w[0]), Number(w[1])];
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}).filter(function(z) { return z.length > 1; });
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for(i = 0; i != y.length; ++i) if(y[i][0] > maxcp) maxcp = y[i][0];
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var enc/*:{[key:string]:number}*/ = {}, dec/*:{[key:string]:string}|Array<string>*/ = (maxcp < 256 ? [] : {});
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for(i = 0; i != y.length; ++i) {
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/*:: if(Array.isArray(dec)) */ dec[y[i][0]] = String.fromCharCode(y[i][1]);
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enc[String.fromCharCode(y[i][1])] = y[i][0];
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}
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var odec = "", outstr = "";
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if(maxcp < 256) {
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/*:: if(Array.isArray(dec)) { */
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for(i = 0; i != 256; ++i) if(typeof dec[i] === "undefined") dec[i] = String.fromCharCode(0xFFFD);
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odec = JSON.stringify(dec.join(""));
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outstr = '(function(){ var d = ' + odec + ', D = [], e = {}; for(var i=0;i!=d.length;++i) { if(d.charCodeAt(i) !== 0xFFFD) e[d.charAt(i)] = i; D[i] = d.charAt(i); } return {"enc": e, "dec": D }; })();';
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/*:: } */
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} else {
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var dd = [];
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/*:: if(!Array.isArray(dec)) { */
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for(i in dec) if(dec.hasOwnProperty(i)) {
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ii = +i;
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if(typeof dd[ii >> 8] === "undefined") dd[ii >> 8] = [];
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dd[ii >> 8][ii % 256] = dec[i];
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}
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/*:: } */
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outstr = '(function(){ var d = [], e = {}, D = [], j;\n';
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for(var i = 0; i != 256; ++i) if(dd[i]) {
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for(var j = 0; j != 256; ++j) if(typeof dd[i][j] === "undefined") dd[i][j] = String.fromCharCode(0xFFFD);
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outstr += 'D[' + i + '] = ' + JSON.stringify(dd[i].join("")) + '.split("");\n';
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outstr += 'for(j = 0; j != D[' + i + '].length; ++j) if(D[' + i + '][j].charCodeAt(0) !== 0xFFFD) { e[D[' + i + '][j]] = ' + (i*256) + ' + j; d[' + (i*256) + ' + j] = D[' + i + '][j];}\n'
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}
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outstr += 'return {"enc": e, "dec": d }; })();';
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}
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process.stdout.write(jsvar + "[" + cp + "] = " + outstr + "\n");
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