88 lines
3.3 KiB
JavaScript
88 lines
3.3 KiB
JavaScript
/**
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* Created by Aleksey Chichenkov <a.chichenkov@initi.ru> on 1/23/19.
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*/
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var js_beautify = require("js-beautify");
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var args = require("args-parser")(process.argv);
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var fs = require("fs");
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var exec = require('child_process').exec;
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exec("re2c -i lexer.l", function(err, stdout, stderr) {
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err && console.log("ERROR: ", err);
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err && process.exit(1);
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post_process_lexer(stdout);
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});
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var post_process_lexer = function (_string) {
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// replace start and end fbrackets
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_string = _string.replace(/START\n\{/gm, "");
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_string = _string.replace(/\}\nEND/gm, "");
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_string = _string.replace(/^.*(_r2c_var_.*;|unsigned int yyaccept = 0;)\n/gm, ""); // replace var yych;
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_string = _string.replace(/(yych = \*this._yy_cursor);\n/gm, "\tcase 1:\n yych = this._string[this._yy_cursor];\n"); // insert "case 1:" before;
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_string = _string.replace(/\*(.*?);/gm, "this._string[$1];"); // замена разыменовываний
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_string = _string.replace(/^yy(\d*?):/gm, "case $1:"); // replace goto marker onto case
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_string = _string.replace(/\) goto yy(\d*?);/gm, ") { id = $1; break; }"); // replace goto inside if
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_string = _string.replace(/goto yy(\d*?);/gm, "id = $1; break;"); // replace goto outside if
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_string = _string.replace(/\{ (addLexeme.*break;) \}/gm, "$1"); // replace addLexeme
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_string = _string.replace(/\{ (unknownSymbol.*break;) \}/gm, "$1"); // replace unknownSymbol
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_string = _string.replace(/0x00/gm, 'undefined'); // replace 0x00
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// black magic
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_string = _string.replace(/(switch \(yych\) \{[\s\S]*?})/gm, "(function(){$1}.bind(this))(); break;"); // добавим замыкание что бы обработать свиче в свиче
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_string = _string.replace(/switch\((id)\)/gm, "switch(this._state)"); // replace id to this._state
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_string = _string.replace(/id = (\d.*?);/gm, "this._state = $1;"); // replace id = n to this._state = n
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_string = _string.replace(/yyaccept/gm, "this._yy_accept"); // replace yyaccept to this._yy_accept
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_string = _string.replace(/yych/gm, "this._yy_char"); // replace yych to this._yy_char
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if(args["t"] !== undefined) {
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switch (args["t"]) {
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case "web":
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_string = "(function(){\n" + _string + "return Lexer; \n})()";
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break;
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case "node":
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_string += "\n module.exports = Lexer";
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break;
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}
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}
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var output = args["o"] || "lexer.js";
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_string = process_metatags(_string);
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if( !(args["no-beautify"] || args["nb"]) ) {
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_string = js_beautify(_string, {indent_size: 4, space_in_empty_paren: true});
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}
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fs.writeFileSync(output, _string);
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};
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var process_metatags = function (_string) {
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var metatags = {};
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_string = _string.replace(/&&>([A-Z_][A-Z0-9_]+)([\s\S]*?)&&/gm, function (_full, _metatag, _text) {
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if(!metatags[_metatag]){
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metatags[_metatag] = {
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includes: []
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};
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}
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metatags[_metatag].includes.push(_text);
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return "";
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});
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_string = _string.replace(/&&<([A-Z_][A-Z0-9_]+)&&/gm, function (_full, _metatag) {
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var metatag = metatags[_metatag];
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if(!metatag){
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throw "not found metatag for include"
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}
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return metatag.includes.join("");
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});
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return _string;
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}; |