536 lines
16 KiB
JavaScript
536 lines
16 KiB
JavaScript
/* jslint node: true */
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'use strict';
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const miscUtil = require('./misc_util.js');
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const ansi = require('./ansi_term.js');
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const Log = require('./logger.js').log;
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// deps
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const events = require('events');
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const util = require('util');
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const _ = require('lodash');
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exports.ANSIEscapeParser = ANSIEscapeParser;
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const CR = 0x0d;
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const LF = 0x0a;
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function ANSIEscapeParser(options) {
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var self = this;
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events.EventEmitter.call(this);
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this.column = 1;
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this.graphicRendition = {};
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this.parseState = {
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re : /(?:\x1b\x5b)([?=;0-9]*?)([ABCDHJKfhlmnpsu])/g, // eslint-disable-line no-control-regex
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};
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options = miscUtil.valueWithDefault(options, {
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mciReplaceChar : '',
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termHeight : 25,
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termWidth : 80,
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trailingLF : 'default', // default|omit|no|yes, ...
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});
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this.mciReplaceChar = miscUtil.valueWithDefault(options.mciReplaceChar, '');
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this.termHeight = miscUtil.valueWithDefault(options.termHeight, 25);
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this.termWidth = miscUtil.valueWithDefault(options.termWidth, 80);
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this.trailingLF = miscUtil.valueWithDefault(options.trailingLF, 'default');
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this.row = Math.min(options?.startRow ?? 1, this.termHeight);
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self.moveCursor = function(cols, rows) {
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self.column += cols;
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self.row += rows;
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self.column = Math.max(self.column, 1);
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self.column = Math.min(self.column, self.termWidth); // can't move past term width
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self.row = Math.max(self.row, 1);
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self.positionUpdated();
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};
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self.saveCursorPosition = function() {
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self.savedPosition = {
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row : self.row,
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column : self.column
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};
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};
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self.restoreCursorPosition = function() {
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self.row = self.savedPosition.row;
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self.column = self.savedPosition.column;
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delete self.savedPosition;
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self.positionUpdated();
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// self.rowUpdated();
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};
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self.clearScreen = function() {
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self.column = 1;
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self.row = 1;
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self.emit('clear screen');
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};
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self.positionUpdated = function() {
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self.emit('position update', self.row, self.column);
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};
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function literal(text) {
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const len = text.length;
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let pos = 0;
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let start = 0;
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let charCode;
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let lastCharCode;
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while(pos < len) {
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charCode = text.charCodeAt(pos) & 0xff; // 8bit clean
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switch(charCode) {
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case CR :
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self.emit('literal', text.slice(start, pos));
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start = pos;
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self.column = 1;
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self.positionUpdated();
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break;
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case LF :
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// Handle ANSI saved with UNIX-style LF's only
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// vs the CRLF pairs
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if (lastCharCode !== CR) {
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self.column = 1;
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}
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self.emit('literal', text.slice(start, pos));
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start = pos;
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self.row += 1;
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self.positionUpdated();
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break;
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default :
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if(self.column === self.termWidth) {
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self.emit('literal', text.slice(start, pos + 1));
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start = pos + 1;
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self.column = 1;
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self.row += 1;
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self.positionUpdated();
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} else {
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self.column += 1;
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}
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break;
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}
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++pos;
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lastCharCode = charCode;
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}
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//
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// Finalize this chunk
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//
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if(self.column > self.termWidth) {
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self.column = 1;
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self.row += 1;
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self.positionUpdated();
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}
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const rem = text.slice(start);
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if(rem) {
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self.emit('literal', rem);
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}
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}
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function parseMCI(buffer) {
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// :TODO: move this to "constants" seciton @ top
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var mciRe = /%([A-Z]{2})([0-9]{1,2})?(?:\(([0-9A-Za-z,]+)\))*/g;
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var pos = 0;
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var match;
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var mciCode;
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var args;
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var id;
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do {
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pos = mciRe.lastIndex;
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match = mciRe.exec(buffer);
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if(null !== match) {
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if(match.index > pos) {
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literal(buffer.slice(pos, match.index));
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}
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mciCode = match[1];
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id = match[2] || null;
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if(match[3]) {
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args = match[3].split(',');
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} else {
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args = [];
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}
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// if MCI codes are changing, save off the current color
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var fullMciCode = mciCode + (id || '');
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if(self.lastMciCode !== fullMciCode) {
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self.lastMciCode = fullMciCode;
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self.graphicRenditionForErase = _.clone(self.graphicRendition);
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}
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self.emit('mci', {
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position : [self.row, self.column],
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mci : mciCode,
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id : id ? parseInt(id, 10) : null,
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args : args,
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SGR : ansi.getSGRFromGraphicRendition(self.graphicRendition, true)
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});
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if(self.mciReplaceChar.length > 0) {
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const sgrCtrl = ansi.getSGRFromGraphicRendition(self.graphicRenditionForErase);
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self.emit('control', sgrCtrl, 'm', sgrCtrl.slice(2).split(/[;m]/).slice(0, 3));
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literal(new Array(match[0].length + 1).join(self.mciReplaceChar));
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} else {
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literal(match[0]);
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}
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}
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} while(0 !== mciRe.lastIndex);
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if(pos < buffer.length) {
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literal(buffer.slice(pos));
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}
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}
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self.reset = function(input) {
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self.column = 1;
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self.row = Math.min(options?.startRow ?? 1, self.termHeight);
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self.parseState = {
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// ignore anything past EOF marker, if any
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buffer : input.split(String.fromCharCode(0x1a), 1)[0],
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re : /(?:\x1b\x5b)([?=;0-9]*?)([ABCDHJKfhlmnpsu])/g, // eslint-disable-line no-control-regex
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stop : false,
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};
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};
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self.stop = function() {
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self.parseState.stop = true;
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};
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self.parse = function(input) {
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if(input) {
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self.reset(input);
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}
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// :TODO: ensure this conforms to ANSI-BBS / CTerm / bansi.txt for movement/etc.
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var pos;
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var match;
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var opCode;
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var args;
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var re = self.parseState.re;
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var buffer = self.parseState.buffer;
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self.parseState.stop = false;
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do {
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if(self.parseState.stop) {
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return;
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}
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pos = re.lastIndex;
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match = re.exec(buffer);
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if(null !== match) {
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if(match.index > pos) {
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parseMCI(buffer.slice(pos, match.index));
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}
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opCode = match[2];
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args = match[1].split(';').map(v => parseInt(v, 10)); // convert to array of ints
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escape(opCode, args);
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//self.emit('chunk', match[0]);
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self.emit('control', match[0], opCode, args);
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}
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} while(0 !== re.lastIndex);
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if(pos < buffer.length) {
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var lastBit = buffer.slice(pos);
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// :TODO: check for various ending LF's, not just DOS \r\n
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if('\r\n' === lastBit.slice(-2).toString()) {
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switch(self.trailingLF) {
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case 'default' :
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//
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// Default is to *not* omit the trailing LF
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// if we're going to end on termHeight
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//
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if(this.termHeight === self.row) {
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lastBit = lastBit.slice(0, -2);
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}
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break;
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case 'omit' :
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case 'no' :
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case false :
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lastBit = lastBit.slice(0, -2);
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break;
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}
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}
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parseMCI(lastBit);
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}
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self.emit('complete');
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};
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/*
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self.parse = function(buffer, savedRe) {
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// :TODO: ensure this conforms to ANSI-BBS / CTerm / bansi.txt for movement/etc.
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// :TODO: move this to "constants" section @ top
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var re = /(?:\x1b\x5b)([\?=;0-9]*?)([ABCDHJKfhlmnpsu])/g;
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var pos = 0;
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var match;
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var opCode;
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var args;
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// ignore anything past EOF marker, if any
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buffer = buffer.split(String.fromCharCode(0x1a), 1)[0];
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do {
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pos = re.lastIndex;
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match = re.exec(buffer);
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if(null !== match) {
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if(match.index > pos) {
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parseMCI(buffer.slice(pos, match.index));
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}
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opCode = match[2];
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args = getArgArray(match[1].split(';'));
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escape(opCode, args);
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self.emit('chunk', match[0]);
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}
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} while(0 !== re.lastIndex);
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if(pos < buffer.length) {
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parseMCI(buffer.slice(pos));
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}
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self.emit('complete');
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};
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*/
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function escape(opCode, args) {
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let arg;
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switch(opCode) {
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// cursor up
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case 'A' :
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//arg = args[0] || 1;
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arg = isNaN(args[0]) ? 1 : args[0];
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self.moveCursor(0, -arg);
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break;
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// cursor down
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case 'B' :
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//arg = args[0] || 1;
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arg = isNaN(args[0]) ? 1 : args[0];
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self.moveCursor(0, arg);
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break;
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// cursor forward/right
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case 'C' :
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//arg = args[0] || 1;
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arg = isNaN(args[0]) ? 1 : args[0];
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self.moveCursor(arg, 0);
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break;
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// cursor back/left
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case 'D' :
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//arg = args[0] || 1;
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arg = isNaN(args[0]) ? 1 : args[0];
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self.moveCursor(-arg, 0);
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break;
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case 'f' : // horiz & vertical
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case 'H' : // cursor position
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//self.row = args[0] || 1;
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//self.column = args[1] || 1;
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self.row = isNaN(args[0]) ? 1 : args[0];
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self.column = isNaN(args[1]) ? 1 : args[1];
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//self.rowUpdated();
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self.positionUpdated();
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break;
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// save position
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case 's' :
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self.saveCursorPosition();
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break;
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// restore position
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case 'u' :
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self.restoreCursorPosition();
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break;
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// set graphic rendition
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case 'm' :
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self.graphicRendition.reset = false;
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for(let i = 0, len = args.length; i < len; ++i) {
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arg = args[i];
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if(ANSIEscapeParser.foregroundColors[arg]) {
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self.graphicRendition.fg = arg;
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} else if(ANSIEscapeParser.backgroundColors[arg]) {
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self.graphicRendition.bg = arg;
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} else if(ANSIEscapeParser.styles[arg]) {
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switch(arg) {
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case 0 :
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// clear out everything
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delete self.graphicRendition.intensity;
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delete self.graphicRendition.underline;
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delete self.graphicRendition.blink;
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delete self.graphicRendition.negative;
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delete self.graphicRendition.invisible;
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delete self.graphicRendition.fg;
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delete self.graphicRendition.bg;
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self.graphicRendition.reset = true;
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//self.graphicRendition.fg = 39;
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//self.graphicRendition.bg = 49;
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break;
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case 1 :
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case 2 :
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case 22 :
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self.graphicRendition.intensity = arg;
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break;
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case 4 :
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case 24 :
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self.graphicRendition.underline = arg;
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break;
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case 5 :
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case 6 :
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case 25 :
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self.graphicRendition.blink = arg;
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break;
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case 7 :
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case 27 :
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self.graphicRendition.negative = arg;
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break;
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case 8 :
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case 28 :
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self.graphicRendition.invisible = arg;
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break;
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default :
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Log.trace( { attribute : arg }, 'Unknown attribute while parsing ANSI');
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break;
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}
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}
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}
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self.emit('sgr update', self.graphicRendition);
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break; // m
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// :TODO: s, u, K
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// erase display/screen
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case 'J' :
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// :TODO: Handle other 'J' types!
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if(2 === args[0]) {
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self.clearScreen();
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}
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break;
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}
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}
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}
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util.inherits(ANSIEscapeParser, events.EventEmitter);
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ANSIEscapeParser.foregroundColors = {
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30 : 'black',
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31 : 'red',
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32 : 'green',
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33 : 'yellow',
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34 : 'blue',
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35 : 'magenta',
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36 : 'cyan',
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37 : 'white',
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39 : 'default', // same as white for most implementations
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90 : 'grey'
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};
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Object.freeze(ANSIEscapeParser.foregroundColors);
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ANSIEscapeParser.backgroundColors = {
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40 : 'black',
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41 : 'red',
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42 : 'green',
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43 : 'yellow',
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44 : 'blue',
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45 : 'magenta',
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46 : 'cyan',
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47 : 'white',
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49 : 'default', // same as black for most implementations
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};
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Object.freeze(ANSIEscapeParser.backgroundColors);
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// :TODO: ensure these names all align with that of ansi_term.js
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//
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// See the following specs:
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// * http://www.ansi-bbs.org/ansi-bbs-core-server.html
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// * http://www.vt100.net/docs/vt510-rm/SGR
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// * https://github.com/protomouse/synchronet/blob/master/src/conio/cterm.txt
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//
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// Note that these are intentionally not in order such that they
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// can be grouped by concept here in code.
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//
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ANSIEscapeParser.styles = {
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0 : 'default', // Everything disabled
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1 : 'intensityBright', // aka bold
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2 : 'intensityDim',
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22 : 'intensityNormal',
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4 : 'underlineOn', // Not supported by most BBS-like terminals
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24 : 'underlineOff', // Not supported by most BBS-like terminals
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5 : 'blinkSlow', // blinkSlow & blinkFast are generally treated the same
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6 : 'blinkFast', // blinkSlow & blinkFast are generally treated the same
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25 : 'blinkOff',
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7 : 'negativeImageOn', // Generally not supported or treated as "reverse FG & BG"
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27 : 'negativeImageOff', // Generally not supported or treated as "reverse FG & BG"
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8 : 'invisibleOn', // FG set to BG
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28 : 'invisibleOff', // Not supported by most BBS-like terminals
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};
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Object.freeze(ANSIEscapeParser.styles);
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