Added support for END and GOTO. GOTO allows computed line numbers, so technically, the language is now Turing complete.
git-svn-id: https://shellinabox.googlecode.com/svn/trunk@116 0da03de8-d603-11dd-86c2-0f8696b7b6f9
This commit is contained in:
zodiac
parent
3bacdb002b
commit
dcbd78df55
2 changed files with 189 additions and 115 deletions
159
demo/demo.js
159
demo/demo.js
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@ -68,9 +68,8 @@
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// #define STATE_PROMPT 2
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// #define STATE_READLINE 3
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// #define STATE_COMMAND 4
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// #define STATE_EVAL 5
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// #define STATE_EXEC 6
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// #define STATE_NEW_Y_N 7
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// #define STATE_EXEC 5
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// #define STATE_NEW_Y_N 6
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// #define TYPE_STRING 0
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// #define TYPE_NUMBER 1
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@ -90,7 +89,7 @@ function Demo(container) {
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extend(Demo, VT100);
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Demo.prototype.keysPressed = function(ch) {
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if (this.state == 6 /* STATE_EXEC */) {
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if (this.state == 5 /* STATE_EXEC */) {
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for (var i = 0; i < ch.length; i++) {
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var c = ch.charAt(i);
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if (c == '\u0003') {
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@ -123,7 +122,7 @@ Demo.prototype.demo = function() {
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this.nextTimer = undefined;
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while (!done) {
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var state = this.state;
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this.state = 0 /* STATE_IDLE */;
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this.state = 2 /* STATE_PROMPT */;
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switch (state) {
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case 1 /* STATE_INIT */:
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done = this.doInit();
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@ -137,16 +136,12 @@ Demo.prototype.demo = function() {
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case 4 /* STATE_COMMAND */:
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done = this.doCommand();
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break;
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case 5 /* STATE_EVAL */:
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done = this.doEval();
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break;
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case 6 /* STATE_EXEC */:
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case 5 /* STATE_EXEC */:
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done = this.doExec();
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break;
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case 7 /* STATE_NEW_Y_N */:
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case 6 /* STATE_NEW_Y_N */:
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done = this.doNewYN();
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break;
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case 0 /* STATE_IDLE */:
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default:
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done = true;
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break;
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@ -258,6 +253,7 @@ Demo.prototype.doCommand = function() {
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this.program.splice(index, 1);
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}
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} else {
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tokens.reset();
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if (index >= 0) {
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// Replace line in program
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this.program[index].setTokens(tokens);
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@ -270,27 +266,32 @@ Demo.prototype.doCommand = function() {
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} else {
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this.currentLineIndex = -1;
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this.evalLineIndex = -1;
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tokens.reset();
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this.tokens = tokens;
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this.gotoState(5 /* STATE_EVAL */);
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return this.doEval();
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}
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}
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tokens.reset();
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return false;
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};
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Demo.prototype.doEval = function() {
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this.gotoState(2 /* STATE_PROMPT */);
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var token = this.tokens.peekToken();
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if (token == "DIM") {
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this.tokens.consume();
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this.doDim();
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} else if (token == "END") {
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this.tokens.consume();
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this.doEnd();
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} else if (token == "GOTO") {
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this.tokens.consume();
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this.doGoto();
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} else if (token == "HELP") {
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this.tokens.consume();
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if (this.tokens.nextToken() != undefined) {
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this.error('HELP does not take any arguments');
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} else {
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this.vt100('Supported commands:\r\n' +
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'DIM HELP LET LIST NEW PRINT RUN\r\n'+
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'DIM END GOTO HELP LET LIST NEW PRINT RUN\r\n'+
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'\r\n'+
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'Supported functions:\r\n'+
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'ABS() ASC() ATN() CHR$() COS() EXP() INT() LEFT$() LEN()\r\n'+
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@ -313,7 +314,7 @@ Demo.prototype.doEval = function() {
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this.ok();
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} else {
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this.vt100('Do you really want to delete the program (y/N) ');
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this.gotoState(7 /* STATE_NEW_Y_N */);
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this.gotoState(6 /* STATE_NEW_Y_N */);
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}
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} else if (token == "PRINT" || token == "?") {
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this.tokens.consume();
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@ -325,7 +326,7 @@ Demo.prototype.doEval = function() {
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} else if (this.program.length > 0) {
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this.currentLineIndex = 0;
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this.vars = new Object();
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this.gotoState(6 /* STATE_EXEC */);
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this.gotoState(5 /* STATE_EXEC */);
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} else {
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this.ok();
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}
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@ -335,48 +336,6 @@ Demo.prototype.doEval = function() {
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return false;
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};
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Demo.prototype.doDim = function() {
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for (;;) {
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var token = this.tokens.nextToken();
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if (token == undefined) {
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return;
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}
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if (!token || !token.match(/^[A-Za-z][A-Za-z0-9_]*$/)) {
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return this.error('Identifier expected');
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}
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token = this.tokens.nextToken();
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if (token == '$' || token == '%') {
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token = this.tokens.nextToken();
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}
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if (token != '(') {
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return this.error('"(" expected');
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}
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do {
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var size = this.expr();
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if (!size) {
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return size;
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}
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if (size.type() != 1 /* TYPE_NUMBER */) {
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return this.error('Numeric value expected');
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}
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if (Math.floor(size.val()) < 1) {
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return this.error('Range error');
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}
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token = this.tokens.nextToken();
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} while (token == ',');
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if (token != ')') {
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return this.error('")" expected');
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}
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if (this.tokens.peekToken() != ',') {
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break;
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}
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this.tokens.consume();
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}
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if (this.tokens.peekToken() != undefined) {
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return this.error();
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}
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};
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Demo.prototype.arrayIndex = function() {
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var token = this.tokens.peekToken();
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var arr = '';
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@ -457,6 +416,83 @@ Demo.prototype.doAssignment = function() {
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}
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};
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Demo.prototype.doDim = function() {
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for (;;) {
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var token = this.tokens.nextToken();
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if (token == undefined) {
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return;
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}
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if (!token || !token.match(/^[A-Za-z][A-Za-z0-9_]*$/)) {
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return this.error('Identifier expected');
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}
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token = this.tokens.nextToken();
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if (token == '$' || token == '%') {
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token = this.tokens.nextToken();
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}
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if (token != '(') {
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return this.error('"(" expected');
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}
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do {
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var size = this.expr();
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if (!size) {
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return size;
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}
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if (size.type() != 1 /* TYPE_NUMBER */) {
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return this.error('Numeric value expected');
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}
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if (Math.floor(size.val()) < 1) {
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return this.error('Range error');
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}
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token = this.tokens.nextToken();
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} while (token == ',');
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if (token != ')') {
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return this.error('")" expected');
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}
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if (this.tokens.peekToken() != ',') {
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break;
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}
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this.tokens.consume();
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}
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if (this.tokens.peekToken() != undefined) {
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return this.error();
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}
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};
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Demo.prototype.doEnd = function() {
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if (this.evalLineIndex < 0) {
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return this.error('Cannot use END interactively');
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}
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if (this.tokens.nextToken() != undefined) {
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return this.error('END does not take any arguments');
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}
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this.currentLineIndex = this.program.length;
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};
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Demo.prototype.doGoto = function() {
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if (this.evalLineIndex < 0) {
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return this.error('Cannot use GOTO interactively');
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}
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var value = this.expr();
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if (value == undefined) {
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return;
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}
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if (value.type() != 1 /* TYPE_NUMBER */) {
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return this.error('Numeric value expected');
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}
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if (this.tokens.nextToken() != undefined) {
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return this.error('GOTO takes exactly one numeric argument');
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}
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var number = this.toInt(value.val());
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if (number <= 0) {
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return this.error('Range error');
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}
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var idx = this.findLine(number);
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if (idx < 0) {
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return this.error('No line number ' + line);
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}
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this.currentLineIndex = idx;
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};
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Demo.prototype.doList = function() {
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var start = undefined;
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var stop = undefined;
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@ -586,10 +622,11 @@ Demo.prototype.doExec = function() {
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if (this.currentLineIndex < 0) {
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return false;
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} else if (this.currentLineIndex >= this.program.length) {
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this.currentLineIndex = -1;
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this.ok();
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return false;
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} else {
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this.gotoState(6 /* STATE_EXEC */, 20);
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this.gotoState(5 /* STATE_EXEC */, 20);
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return true;
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}
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};
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@ -613,7 +650,7 @@ Demo.prototype.doNewYN = function() {
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this.vt100('\u0007');
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}
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}
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this.gotoState(7 /* STATE_NEW_Y_N */);
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this.gotoState(6 /* STATE_NEW_Y_N */);
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return true;
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};
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145
demo/demo.jspp
145
demo/demo.jspp
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@ -68,9 +68,8 @@
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#define STATE_PROMPT 2
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#define STATE_READLINE 3
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#define STATE_COMMAND 4
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#define STATE_EVAL 5
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#define STATE_EXEC 6
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#define STATE_NEW_Y_N 7
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#define STATE_EXEC 5
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#define STATE_NEW_Y_N 6
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#define TYPE_STRING 0
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#define TYPE_NUMBER 1
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@ -123,7 +122,7 @@ Demo.prototype.demo = function() {
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this.nextTimer = undefined;
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while (!done) {
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var state = this.state;
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this.state = STATE_IDLE;
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this.state = STATE_PROMPT;
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switch (state) {
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case STATE_INIT:
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done = this.doInit();
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@ -137,16 +136,12 @@ Demo.prototype.demo = function() {
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case STATE_COMMAND:
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done = this.doCommand();
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break;
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case STATE_EVAL:
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done = this.doEval();
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break;
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case STATE_EXEC:
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done = this.doExec();
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break;
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case STATE_NEW_Y_N:
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done = this.doNewYN();
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break;
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case STATE_IDLE:
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default:
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done = true;
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break;
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@ -258,6 +253,7 @@ Demo.prototype.doCommand = function() {
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this.program.splice(index, 1);
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}
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} else {
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tokens.reset();
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if (index >= 0) {
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// Replace line in program
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this.program[index].setTokens(tokens);
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@ -270,27 +266,32 @@ Demo.prototype.doCommand = function() {
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} else {
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this.currentLineIndex = -1;
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this.evalLineIndex = -1;
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tokens.reset();
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this.tokens = tokens;
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this.gotoState(STATE_EVAL);
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return this.doEval();
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}
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}
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tokens.reset();
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return false;
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};
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Demo.prototype.doEval = function() {
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this.gotoState(STATE_PROMPT);
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var token = this.tokens.peekToken();
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if (token == "DIM") {
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this.tokens.consume();
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this.doDim();
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} else if (token == "END") {
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this.tokens.consume();
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this.doEnd();
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} else if (token == "GOTO") {
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this.tokens.consume();
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this.doGoto();
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} else if (token == "HELP") {
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this.tokens.consume();
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if (this.tokens.nextToken() != undefined) {
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this.error('HELP does not take any arguments');
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} else {
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this.vt100('Supported commands:\r\n' +
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'DIM HELP LET LIST NEW PRINT RUN\r\n'+
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'DIM END GOTO HELP LET LIST NEW PRINT RUN\r\n'+
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'\r\n'+
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'Supported functions:\r\n'+
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'ABS() ASC() ATN() CHR$() COS() EXP() INT() LEFT$() LEN()\r\n'+
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@ -335,48 +336,6 @@ Demo.prototype.doEval = function() {
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return false;
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};
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Demo.prototype.doDim = function() {
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for (;;) {
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var token = this.tokens.nextToken();
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if (token == undefined) {
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return;
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}
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if (!token || !token.match(/^[A-Za-z][A-Za-z0-9_]*$/)) {
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return this.error('Identifier expected');
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}
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token = this.tokens.nextToken();
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if (token == '$' || token == '%') {
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token = this.tokens.nextToken();
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}
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if (token != '(') {
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return this.error('"(" expected');
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}
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do {
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var size = this.expr();
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if (!size) {
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return size;
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}
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if (size.type() != TYPE_NUMBER) {
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return this.error('Numeric value expected');
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}
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if (Math.floor(size.val()) < 1) {
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return this.error('Range error');
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}
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token = this.tokens.nextToken();
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} while (token == ',');
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if (token != ')') {
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return this.error('")" expected');
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}
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if (this.tokens.peekToken() != ',') {
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break;
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}
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this.tokens.consume();
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}
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if (this.tokens.peekToken() != undefined) {
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return this.error();
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}
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};
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Demo.prototype.arrayIndex = function() {
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var token = this.tokens.peekToken();
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var arr = '';
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@ -457,6 +416,83 @@ Demo.prototype.doAssignment = function() {
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}
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};
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Demo.prototype.doDim = function() {
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for (;;) {
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var token = this.tokens.nextToken();
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if (token == undefined) {
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return;
|
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}
|
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if (!token || !token.match(/^[A-Za-z][A-Za-z0-9_]*$/)) {
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return this.error('Identifier expected');
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}
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token = this.tokens.nextToken();
|
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if (token == '$' || token == '%') {
|
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token = this.tokens.nextToken();
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}
|
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if (token != '(') {
|
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return this.error('"(" expected');
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}
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do {
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var size = this.expr();
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if (!size) {
|
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return size;
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}
|
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if (size.type() != TYPE_NUMBER) {
|
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return this.error('Numeric value expected');
|
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}
|
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if (Math.floor(size.val()) < 1) {
|
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return this.error('Range error');
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}
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token = this.tokens.nextToken();
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} while (token == ',');
|
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if (token != ')') {
|
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return this.error('")" expected');
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}
|
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if (this.tokens.peekToken() != ',') {
|
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break;
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}
|
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this.tokens.consume();
|
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}
|
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if (this.tokens.peekToken() != undefined) {
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return this.error();
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}
|
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};
|
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Demo.prototype.doEnd = function() {
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if (this.evalLineIndex < 0) {
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return this.error('Cannot use END interactively');
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}
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if (this.tokens.nextToken() != undefined) {
|
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return this.error('END does not take any arguments');
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}
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this.currentLineIndex = this.program.length;
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};
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Demo.prototype.doGoto = function() {
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if (this.evalLineIndex < 0) {
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return this.error('Cannot use GOTO interactively');
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}
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var value = this.expr();
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if (value == undefined) {
|
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return;
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}
|
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if (value.type() != TYPE_NUMBER) {
|
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return this.error('Numeric value expected');
|
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}
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if (this.tokens.nextToken() != undefined) {
|
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return this.error('GOTO takes exactly one numeric argument');
|
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}
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var number = this.toInt(value.val());
|
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if (number <= 0) {
|
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return this.error('Range error');
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}
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var idx = this.findLine(number);
|
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if (idx < 0) {
|
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return this.error('No line number ' + line);
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}
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this.currentLineIndex = idx;
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};
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Demo.prototype.doList = function() {
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var start = undefined;
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var stop = undefined;
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|
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@ -586,6 +622,7 @@ Demo.prototype.doExec = function() {
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if (this.currentLineIndex < 0) {
|
||||
return false;
|
||||
} else if (this.currentLineIndex >= this.program.length) {
|
||||
this.currentLineIndex = -1;
|
||||
this.ok();
|
||||
return false;
|
||||
} else {
|
||||
|
|
|
|||
Loading…
Reference in a new issue