321 lines
6.4 KiB
JavaScript
321 lines
6.4 KiB
JavaScript
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// VD.js -- a viewdata terminal emulator
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// constructor
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function VD(wd, ht, scr_id)
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{
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var r;
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var c;
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var scr = document.getElementById(scr_id);
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this.wd_ = wd;
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this.ht_ = ht;
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this.text_ = new Array(ht);
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for (r = 0; r < ht; ++r) {
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this.text_[r] = new Array(wd);
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}
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this.scr_ = scr;
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this.cursor_vis_ = true;
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this.getch_isr_ = undefined;
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this.grab_events_ = false;
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this.key_buf_ = [];
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this.esc_state_ = 0;
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this.col_ = 0;
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this.row_ = 0;
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// Internal debug setting.
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this.clear();
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//this.refresh();
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}
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VD.A_REVERSE = 2;
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VD.A_BLINK = 4;
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VD.browser_ie_ = (navigator.appName.indexOf("Microsoft") != -1);
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VD.browser_opera_ = (navigator.appName.indexOf("Opera") != -1);
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// class variables
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VD.the_vt_ = undefined;
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// object methods
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VD.prototype.html_colours_ = function(at_fg, at_bg, at_mode)
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{
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var co0, co1;
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if (at_mode & VD.A_REVERSE) {
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co0 = 'ff';
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co1 = '00';
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} else {
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co0 = '00';
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co1 = 'ff';
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}
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return {
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f: '#' + (at_fg & 1 ? co1 : co0) +
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(at_fg & 2 ? co1 : co0) +
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(at_fg & 4 ? co1 : co0),
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b: '#' + (at_bg & 1 ? co1 : co0) +
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(at_bg & 2 ? co1 : co0) +
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(at_bg & 4 ? co1 : co0)
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};
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}
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VD.prototype.clear = function()
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{
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this.row_ = this.col_ = 0;
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for (r = 0; r < this.ht_; ++r) {
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for (c = 0; c < this.wd_; ++c) {
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this.text_[r][c] = ' ';
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}
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}
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}
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VD.prototype.curs_set = function(vis, grab, eventist)
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{
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if (vis !== undefined)
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this.cursor_vis_ = (vis > 0);
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}
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VD.prototype.getch = function(isr)
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{
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// this.refresh();
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this.getch_isr_ = isr;
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setTimeout(VD.go_getch_, 0);
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}
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VD.go_getch_ = function VD_go_getch()
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{
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var vt = VD.the_vt_;
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if (vt === undefined)
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return;
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var isr = vt.getch_isr_;
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vt.getch_isr_ = undefined;
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if (isr === undefined)
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return;
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var ch = vt.key_buf_.shift();
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if (ch === undefined) {
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vt.getch_isr_ = isr;
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return;
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}
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isr(ch, vt);
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}
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VD.prototype.move = function(r, c)
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{
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if (r < 0)
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r = 0;
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else if (r >= this.ht_)
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r = this.ht_ - 1;
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if (c < 0)
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c = 0;
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else if (c >= this.wd_)
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c = this.wd_ - 1;
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this.row_ = r;
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this.col_ = c;
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}
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VD.prototype.refresh = function()
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{
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var r, c, stuff = "", start_tag = "", end_tag = "", ch,
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pair, cr, cc, ht, wd, cv, n_fg, n_bg, n_mode, n_type, a_fg=-1, a_bg=-1, a_mode=-1;
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ht = this.ht_;
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wd = this.wd_;
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cr = this.row_;
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cc = this.col_;
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cv = this.cursor_vis_;
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// var innerHTML = this.scr_.innerHTML;
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if (cc >= wd)
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cc = wd - 1;
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for (r = 0; r < ht; ++r) {
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if (r > 0) {
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stuff += '\n';
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}
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n_fg = 7;
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n_bg = 0;
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n_mode = 0;
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n_type = 0;
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for (c = 0; c < wd; ++c) {
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if (cv && r == cr && c == cc) {
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// Draw the cursor here.
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n_mode |= VD.A_REVERSE;
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} else {
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n_mode &= ~VD.A_REVERSE;
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}
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ch = this.text_[r][c];
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//console.log('CH: %i (%s) [%i,%i]',ch.charCodeAt(0),ch,r,c);
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if (ch.charCodeAt(0) >= 129 && ch.charCodeAt(0) <= 135) {
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n_fg = ch.charCodeAt(0)-128;
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n_type &= ~2;
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n_type &= ~16;
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}
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if (ch.charCodeAt(0) >= 145 && ch.charCodeAt(0) <= 151) {
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n_fg = ch.charCodeAt(0)-144;
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n_type |= 2;
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n_type &= ~16;
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}
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if (ch == '\x88')
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n_mode |= VD.A_BLINK;
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if (ch == '\x89')
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n_mode &= ~VD.A_BLINK;
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if (ch == '\x8c')
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n_type &= ~8;
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if (ch == '\x8d')
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n_type |= 8;
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if (ch == '\x98')
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n_type |= 16;
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if (ch == '\x99')
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n_type &= ~1;
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if (ch == '\x9a')
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n_type |= 1;
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if (ch == '\x9c')
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n_bg = 0;
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if (ch == '\x9d')
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n_bg = n_fg;
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if (ch == '\x9e')
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n_type |= 32;
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if (ch == '\x9f')
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n_type &= ~32;
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// If the attributes changed, make a new span.
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if (n_mode != a_mode || n_fg != a_fg || n_bg != a_bg) {
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stuff += end_tag;
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pair = this.html_colours_(n_fg, n_bg, n_mode);
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stuff += '<span style="color:' + pair.f + ';background-color:' + pair.b + ';">';
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// + (n_mode & VD.A_BLINK ? ' class="blink"' : '') + '>';
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end_tag = "</span>";
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a_fg = n_fg;
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a_bg = n_bg;
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a_mode = n_mode;
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}
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if (ch.charCodeAt(0) >= 128)
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ch = ' ';
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if (n_type & 2) {
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if ( ch.charCodeAt(0) >= 0x20 && ch.charCodeAt(0) <= 0x3f) {
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ch = '&#x' + (ch.charCodeAt(0)+0xe1e0+((n_type & 1)*0xc0)).toString(16) +";";
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} else if ( ch.charCodeAt(0) >= 0x60 && ch.charCodeAt(0) <= 0x7f) {
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ch = '&#x' + (ch.charCodeAt(0)+0xe1c0+((n_type & 1)*0xc0)).toString(16) +";";
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}
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}
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switch (ch) {
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case '&':
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stuff += '&'; break;
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case '<':
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stuff += '<'; break;
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case '>':
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stuff += '>'; break;
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case ' ':
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// stuff += ' '; break;
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stuff += '\xa0'; break;
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case '\x7e':
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case '~':
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stuff += '\xf7'; break;
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case '\x7f':
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stuff += ""; break
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case '_':
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stuff += '#'; break
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case '{':
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stuff += '\xbc'; break
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case '\\':
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stuff += '\xbd'; break
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case '}':
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stuff += '\xbe'; break
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case '#':
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stuff += '\xa3'; break
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default:
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stuff += ch;
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}
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}
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}
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stuff += end_tag
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//this.scr_.innerHTML = "<b>" + stuff + "</b>\n";
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this.scr_.innerHTML = stuff + "\n";
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}
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VD.prototype.write = function(stuff)
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{
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var ch, i;
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for (i = 0; i < stuff.length; ++i) {
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ch = stuff.charCodeAt(i);
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if (this.esc_state_ && ch > 31)
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ch = (ch % 32) + 128;
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this.esc_state_ = 0;
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switch (ch) {
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case 8:
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if (this.col_ != 0) {
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--this.col_;
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} else {
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this.col_ = this.wd_-1;
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if (this.row_ == 0) {
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this.row_ = this.ht_-1;
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} else {
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--this.row_;
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}
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}
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break;
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case 9:
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if (this.col_ >= this.wd_) {
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this.col_ = 0;
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if (this.row_ == this.ht_-1) {
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this.row_ = 0;
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} else {
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++this.row_;
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}
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} else {
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++this.col_;
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}
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break;
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case 10:
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if (this.row_ >= this.ht_-1) {
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this.row_ = 0;
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} else {
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++this.row_;
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}
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break;
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case 11:
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if (this.row_ == 0) {
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this.row_ = this.ht_-1;
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} else {
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--this.row_;
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}
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break;
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case 12:
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this.clear();
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this.move(0, 0);
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break;
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case 13:
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this.col_ = 0;
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break;
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case 17:
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this.curs_set(1);
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break;
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case 20:
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this.curs_set(0);
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break;
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case 27:
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this.esc_state_ = 1;
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break;
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case 30:
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this.move(0, 0);
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break;
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default:
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if (ch > 31) {
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this.text_[this.row_][this.col_] = String.fromCharCode(ch);
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if (this.col_ >= this.wd_-1) {
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this.col_ = 0;
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if (this.row_ >= this.ht_-1) {
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this.row_ = 0;
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} else {
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++this.row_;
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}
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} else {
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++this.col_;
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}
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}
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}
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}
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this.refresh();
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}
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