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CodeGeneratorJs.js
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CodeGeneratorJs.js
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// CodeGeneratorJs.js - Code Generator for JavaScript
// (c) Marco Vieth, 2019
// https://benchmarko.github.io/CPCBasic/
//
//
"use strict";
var Utils;
if (typeof require !== "undefined") {
Utils = require("./Utils.js"); // eslint-disable-line global-require
}
function CodeGeneratorJs(options) {
this.init(options);
}
CodeGeneratorJs.prototype = {
init: function (options) {
this.lexer = options.lexer;
this.parser = options.parser;
this.tron = options.tron; // tron (trace on flag)
this.rsx = options.rsx; // optional RSX names to check
this.bQuiet = options.bQuiet || false;
this.bNoCodeFrame = options.bNoCodeFrame || false;
this.oStack = {
forLabel: [],
forVarName: [],
whileLabel: []
};
this.aData = []; // collected data from data lines
this.reJsKeywords = this.createJsKeywordRegex();
},
reset: function () {
var oStack = this.oStack;
oStack.forLabel.length = 0;
oStack.forVarName.length = 0;
oStack.whileLabel.length = 0;
this.iLine = 0; // current line (label)
this.resetCountsPerLine();
this.aData.length = 0;
this.oLabels = {}; // labels or line numbers
this.bMergeFound = false; // if we find chain or chain merge, the program is not complete and we cannot check for existing line numbers during compile time (or do a renumber)
},
resetCountsPerLine: function () {
this.iGosubCount = 0;
this.iIfCount = 0;
this.iStopCount = 0;
this.iForCount = 0; // stack needed
this.iWhileCount = 0; // stack needed
},
composeError: function (oError, message, value, pos) {
return Utils.composeError("CodeGeneratorJs", oError, message, value, pos, this.iLine);
},
// ECMA 3 JS Keywords which must be avoided in dot notation for properties when using IE8
aJsKeywords: [
"do",
"if",
"in",
"for",
"int",
"new",
"try",
"var",
"byte",
"case",
"char",
"else",
"enum",
"goto",
"long",
"null",
"this",
"true",
"void",
"with",
"break",
"catch",
"class",
"const",
"false",
"final",
"float",
"short",
"super",
"throw",
"while",
"delete",
"double",
"export",
"import",
"native",
"public",
"return",
"static",
"switch",
"throws",
"typeof",
"boolean",
"default",
"extends",
"finally",
"package",
"private",
"abstract",
"continue",
"debugger",
"function",
"volatile",
"interface",
"protected",
"transient",
"implements",
"instanceof",
"synchronized"
],
createJsKeywordRegex: function () {
var reJsKeywords = new RegExp("^(" + this.aJsKeywords.join("|") + ")$");
return reJsKeywords;
},
//
// evaluate
//
evaluate: function (parseTree, oVariables) {
var that = this,
fnDeclareVariable = function (sName) {
if (!oVariables.variableExist(sName)) { // variable not yet defined?
oVariables.initVariable(sName);
}
},
oDefScopeArgs = undefined, // eslint-disable-line no-undef-init
fnAdaptVariableName = function (sName, iArrayIndices) {
sName = sName.toLowerCase();
sName = sName.replace(/\./g, "_");
if (oDefScopeArgs || !Utils.bSupportReservedNames) { // avoid keywords as def fn parameters; and for IE8 avoid keywords in dot notation
if (that.reJsKeywords.test(sName)) { // IE8: avoid keywords in dot notation
sName = "_" + sName; // prepend underscore
}
}
if (sName.endsWith("!")) { // real number?
sName = sName.slice(0, -1) + "R"; // "!" => "R"
} else if (sName.endsWith("%")) { // integer number?
sName = sName.slice(0, -1) + "I";
}
if (iArrayIndices) {
sName += "A".repeat(iArrayIndices);
}
if (oDefScopeArgs) {
if (sName === "o") { // we must not use format parameter "o" since this is our vm object
sName = "oNo"; // change variable name to something we cannot set in BASIC
}
if (!oDefScopeArgs.bCollectDone) { // in collection mode?
oDefScopeArgs[sName] = true; // declare DEF scope variable
} else if (!(sName in oDefScopeArgs)) {
// variable
fnDeclareVariable(sName);
sName = "v." + sName; // access with "v."
}
} else {
fnDeclareVariable(sName);
sName = "v." + sName; // access with "v."
}
return sName;
},
fnParseOneArg = function (oArg) {
var sValue = parseNode(oArg); // eslint-disable-line no-use-before-define
return sValue;
},
fnParseArgRange = function (aArgs, iStart, iStop) {
var aNodeArgs = [], // do not modify node.args here (could be a parameter of defined function)
i;
for (i = iStart; i <= iStop; i += 1) {
aNodeArgs.push(fnParseOneArg(aArgs[i]));
}
return aNodeArgs;
},
fnParseArgs = function (aArgs) {
var aNodeArgs = [], // do not modify node.args here (could be a parameter of defined function)
i;
for (i = 0; i < aArgs.length; i += 1) {
aNodeArgs[i] = fnParseOneArg(aArgs[i]);
}
return aNodeArgs;
},
fnDetermineStaticVarType = function (sName) {
return oVariables.determineStaticVarType(sName);
},
fnIsIntConst = function (a) {
var reIntConst = /^[+-]?([0-9]+|0x[0-9a-f]+|0b[0-1]+)$/; // regex for integer, hex, binary constant
return reIntConst.test(String(a));
},
fnGetRoundString = function (node) {
if (node.pt !== "I") { // no rounding needed for integer, hex, binary constants, integer variables, functions returning integer (optimization)
node.pv = "o.vmRound(" + node.pv + ")";
}
return node.pv;
},
fnIsInString = function (sString, sFind) {
return sFind && sString.indexOf(sFind) >= 0;
},
fnPropagateStaticTypes = function (node, oLeft, oRight, sTypes) {
if (oLeft.pt && oRight.pt) {
if (fnIsInString(sTypes, oLeft.pt + oRight.pt)) {
node.pt = oLeft.pt === oRight.pt ? oLeft.pt : "R";
} else {
throw that.composeError(Error(), "Type error", node.value, node.pos);
}
} else if (oLeft.pt && !fnIsInString(sTypes, oLeft.pt) || oRight.pt && !fnIsInString(sTypes, oRight.pt)) {
throw that.composeError(Error(), "Type error", node.value, node.pos);
}
},
mOperators = {
"+": function (node, oLeft, oRight) {
var a = oLeft.pv;
if (oRight === undefined) { // unary plus? => skip it
node.pv = a;
if (fnIsInString("IR$", oLeft.pt)) { // I, R or $?
node.pt = oLeft.pt;
} else if (oLeft.pt) {
throw that.composeError(Error(), "Type error", node.value, node.pos);
}
} else {
node.pv = a + " + " + oRight.pv;
fnPropagateStaticTypes(node, oLeft, oRight, "II RR IR RI $$");
}
return node.pv;
},
"-": function (node, oLeft, oRight) {
var a = oLeft.pv;
if (oRight === undefined) { // unary minus?
// when optimizing, beware of "--" operator in JavaScript!
if (fnIsIntConst(a) || oLeft.type === "number") { // int const or number const (also fp)
a = String(a); // also ok for hex or bin strings
if (a.charAt(0) === "-") { // starting already with "-"?
node.pv = a.substr(1); // remove "-"
} else {
node.pv = "-" + a;
}
} else {
node.pv = "-(" + a + ")"; // a can be an expression
}
if (fnIsInString("IR", oLeft.pt)) { // I or R?
node.pt = oLeft.pt;
} else if (oLeft.pt) {
throw that.composeError(Error(), "Type error", node.value, node.pos);
}
} else {
node.pv = a + " - " + oRight.pv;
fnPropagateStaticTypes(node, oLeft, oRight, "II RR IR RI");
}
return node.pv;
},
"*": function (node, oLeft, oRight) {
node.pv = oLeft.pv + " * " + oRight.pv;
fnPropagateStaticTypes(node, oLeft, oRight, "II RR IR RI");
return node.pv;
},
"/": function (node, oLeft, oRight) {
node.pv = oLeft.pv + " / " + oRight.pv;
fnPropagateStaticTypes(node, oLeft, oRight, "II RR IR RI");
return node.pv;
},
"\\": function (node, oLeft, oRight) {
node.pv = "(" + oLeft.pv + " / " + oRight.pv + ") | 0"; // integer division
fnPropagateStaticTypes(node, oLeft, oRight, "II RR IR RI");
node.pt = "I";
return node.pv;
},
"^": function (node, oLeft, oRight) {
node.pv = "Math.pow(" + oLeft.pv + ", " + oRight.pv + ")";
fnPropagateStaticTypes(node, oLeft, oRight, "II RR IR RI");
return node.pv;
},
and: function (node, oLeft, oRight) {
node.pv = fnGetRoundString(oLeft) + " & " + fnGetRoundString(oRight);
fnPropagateStaticTypes(node, oLeft, oRight, "II RR IR RI");
node.pt = "I";
return node.pv;
},
or: function (node, oLeft, oRight) {
node.pv = fnGetRoundString(oLeft) + " | " + fnGetRoundString(oRight);
fnPropagateStaticTypes(node, oLeft, oRight, "II RR IR RI");
node.pt = "I";
return node.pv;
},
xor: function (node, oLeft, oRight) {
node.pv = fnGetRoundString(oLeft) + " ^ " + fnGetRoundString(oRight);
fnPropagateStaticTypes(node, oLeft, oRight, "II RR IR RI");
node.pt = "I";
return node.pv;
},
not: function (node, oRight) {
node.pv = "~(" + fnGetRoundString(oRight) + ")"; // a can be an expression
node.pt = "I";
return node.pv;
},
mod: function (node, oLeft, oRight) {
node.pv = fnGetRoundString(oLeft) + " % " + fnGetRoundString(oRight);
fnPropagateStaticTypes(node, oLeft, oRight, "II RR IR RI");
node.pt = "I";
return node.pv;
},
">": function (node, oLeft, oRight) {
node.pv = oLeft.pv + " > " + oRight.pv + " ? -1 : 0";
fnPropagateStaticTypes(node, oLeft, oRight, "II RR IR RI $$");
node.pt = "I";
return node.pv;
},
"<": function (node, oLeft, oRight) {
node.pv = oLeft.pv + " < " + oRight.pv + " ? -1 : 0";
fnPropagateStaticTypes(node, oLeft, oRight, "II RR IR RI $$");
node.pt = "I";
return node.pv;
},
">=": function (node, oLeft, oRight) {
node.pv = oLeft.pv + " >= " + oRight.pv + " ? -1 : 0";
fnPropagateStaticTypes(node, oLeft, oRight, "II RR IR RI $$");
node.pt = "I";
return node.pv;
},
"<=": function (node, oLeft, oRight) {
node.pv = oLeft.pv + " <= " + oRight.pv + " ? -1 : 0";
fnPropagateStaticTypes(node, oLeft, oRight, "II RR IR RI $$");
node.pt = "I";
return node.pv;
},
"=": function (node, oLeft, oRight) {
node.pv = oLeft.pv + " === " + oRight.pv + " ? -1 : 0";
fnPropagateStaticTypes(node, oLeft, oRight, "II RR IR RI $$");
node.pt = "I";
return node.pv;
},
"<>": function (node, oLeft, oRight) {
node.pv = oLeft.pv + " !== " + oRight.pv + " ? -1 : 0";
fnPropagateStaticTypes(node, oLeft, oRight, "II RR IR RI $$");
node.pt = "I";
return node.pv;
},
"@": function (node, oRight) {
node.pv = 'o.addressOf("' + oRight.pv + '")'; // address of
if (oRight.type !== "identifier") {
throw that.composeError(Error(), "Expected identifier", node.value, node.pos);
}
node.pt = "I";
return node.pv;
},
"#": function (node, oRight) { // stream as prefix operator
node.pv = oRight.pv;
node.pt = "I";
return node.pv;
}
},
mParseFunctions = {
fnParseDefIntRealStr: function (node) {
var aNodeArgs, i, sArg;
aNodeArgs = fnParseArgs(node.args);
for (i = 0; i < aNodeArgs.length; i += 1) {
sArg = aNodeArgs[i];
aNodeArgs[i] = "o." + node.type + '("' + sArg + '")';
}
node.pv = aNodeArgs.join("; ");
return node.pv;
},
fnParseErase: function (node) {
var aNodeArgs, i;
oDefScopeArgs = {}; // collect DEF scope args
aNodeArgs = fnParseArgs(node.args);
oDefScopeArgs = undefined;
for (i = 0; i < aNodeArgs.length; i += 1) {
aNodeArgs[i] = '"' + aNodeArgs[i] + '"'; // put in quotes
}
node.pv = "o." + node.type + "(" + aNodeArgs.join(", ") + ")";
return node.pv;
},
fnAddReferenceLabel: function (sLabel, node) {
if (sLabel in that.oLabels) {
that.oLabels[sLabel] += 1;
} else {
if (Utils.debug > 1) {
Utils.console.debug("fnAddReferenceLabel: line does not (yet) exist:", sLabel);
}
if (!that.bMergeFound) {
throw that.composeError(Error(), "Line does not exist", sLabel, node.pos);
}
}
},
fnCommandWithGoto: function (node, aNodeArgs) { // optional aNodeArgs
var sCommand = node.type,
sLabel;
aNodeArgs = aNodeArgs || fnParseArgs(node.args);
sLabel = that.iLine + "s" + that.iStopCount; // we use stopCount
that.iStopCount += 1;
node.pv = "o." + sCommand + "(" + aNodeArgs.join(", ") + "); o.goto(\"" + sLabel + "\"); break;\ncase \"" + sLabel + "\":";
return node.pv;
},
";": function (node) { // input, line input
node.pv = ";";
return node.pv;
},
",": function (node) { // input, line input
node.pv = ",";
return node.pv;
},
"|": function (node) { // rsx
var sRsxName, bRsxAvailable, aNodeArgs, sLabel;
sRsxName = node.value.substr(1).toLowerCase().replace(/\./g, "_");
bRsxAvailable = that.rsx && that.rsx.rsxIsAvailable(sRsxName);
aNodeArgs = fnParseArgs(node.args);
sLabel = that.iLine + "s" + that.iStopCount; // we use stopCount
that.iStopCount += 1;
if (!bRsxAvailable) { // if RSX not available, we delay the error until it is executed (or catched by on error goto)
aNodeArgs.unshift('"' + sRsxName + '"'); // put as first arg
sRsxName = "rsxExec"; // and call special handler which triggers error if not available
}
node.pv = "o.rsx." + sRsxName + "(" + aNodeArgs.join(", ") + "); o.goto(\"" + sLabel + "\"); break;\ncase \"" + sLabel + "\":"; // most RSX commands need goto (era, ren,...)
return node.pv;
},
number: function (node) {
node.pt = (/^[0-9]+$/).test(node.value) ? "I" : "R";
node.pv = node.value;
return node.pv;
},
binnumber: function (node) {
var sValue = node.value.slice(2); // remove &x
if (Utils.bSupportsBinaryLiterals) {
sValue = "0b" + ((sValue.length) ? sValue : "0"); // &x->0b; 0b is ES6
} else {
sValue = "0x" + ((sValue.length) ? parseInt(sValue, 2).toString(16) : "0"); // we convert it to hex
}
node.pt = "I";
node.pv = sValue;
return node.pv;
},
hexnumber: function (node) {
var sValue = node.value.slice(1), // remove &
n;
if (sValue.charAt(0).toLowerCase() === "h") { // optional h
sValue = sValue.slice(1); // remove
}
sValue = sValue || "0";
n = parseInt(sValue, 16);
if (n > 32767) { // two's complement
n = 65536 - n;
sValue = "-0x" + n.toString(16);
} else {
sValue = "0x" + sValue;
}
node.pt = "I";
node.pv = sValue;
return node.pv;
},
linenumber: function (node) {
node.pv = node.value;
return node.pv;
},
identifier: function (node) { // identifier or identifier with array
var aNodeArgs = [],
sName, sValue, sVarType;
if (node.args) { // array?
aNodeArgs = fnParseArgRange(node.args, 1, node.args.length - 2); // we skip open and close bracket
}
sName = fnAdaptVariableName(node.value, aNodeArgs.length); // here we use node.value
sValue = sName + aNodeArgs.map(function (val) {
return "[" + val + "]";
}).join("");
sVarType = fnDetermineStaticVarType(sName);
if (sVarType.length > 1) {
sVarType = sVarType.charAt(1);
node.pt = sVarType;
}
node.pv = sValue;
return node.pv;
},
letter: function (node) { // for defint, defreal, defstr
node.pv = node.value;
return node.pv;
},
range: function (node) { // for defint, defreal, defstr
var sLeft = fnParseOneArg(node.left),
sRight = fnParseOneArg(node.right);
if (sLeft > sRight) {
throw that.composeError(Error(), "Decreasing range", node.value, node.pos);
}
node.pv = sLeft + " - " + sRight;
return node.pv;
},
linerange: function (node) { // for delete, list
var sLeft, sRight, iLeft, iRight, sRightSpecified;
if (!node.left || !node.right) {
throw this.composeError(Error(), "Programming error: Undefined left or right", node.type, node.pos); // should not occure
}
sLeft = fnParseOneArg(node.left);
sRight = fnParseOneArg(node.right);
iLeft = Number(sLeft); // "undefined" gets NaN (should we check node.left.type for null?)
iRight = Number(sRight);
if (iLeft > iRight) { // comparison with NaN and number is always false
throw that.composeError(Error(), "Decreasing line range", node.value, node.pos);
}
sRightSpecified = (sRight === "undefined") ? "65535" : sRight; // make sure we set a missing right range parameter
node.pv = !sRight ? sLeft : sLeft + ", " + sRightSpecified;
return node.pv;
},
string: function (node) {
node.pt = "$";
node.pv = '"' + node.value + '"';
return node.pv;
},
"null": function (node) { // means: no parameter specified
node.pv = node.value !== "null" ? node.value : "undefined"; // use explicit value or convert "null" to "undefined"
return node.pv;
},
assign: function (node) {
// see also "let"
var sName, sVarType, value, sValue;
if (node.left.type === "identifier") {
sName = fnParseOneArg(node.left);
} else {
throw that.composeError(Error(), "Unexpected assing type", node.type, node.pos); // should not occur
}
value = fnParseOneArg(node.right);
fnPropagateStaticTypes(node, node.left, node.right, "II RR IR RI $$");
sVarType = fnDetermineStaticVarType(sName);
if (node.pt) {
if (node.left.pt === "I" && node.right.pt === "R") {
sValue = "o.vmRound(" + value + ")";
node.pt = "I"; // "R" => "I"
} else {
sValue = value;
}
} else {
sValue = "o.vmAssign(\"" + sVarType + "\", " + value + ")";
}
sValue = sName + " = " + sValue;
node.pv = sValue;
return node.pv;
},
label: function (node) {
var bDirect = false,
value = "",
label, aNodeArgs, value2, i;
label = node.value;
that.iLine = Number(label); // set line before parsing args
that.resetCountsPerLine(); // we want to have "stable" counts, even if other lines change, e.g. direct
if (isNaN(label)) {
if (label === "direct") { // special handling
bDirect = true;
value = "o.goto(\"directEnd\"); break;\n";
}
label = '"' + label + '"'; // for "direct"
}
if (!that.bNoCodeFrame) {
value += "case " + label + ":";
} else {
value = "";
}
aNodeArgs = fnParseArgs(node.args);
if (that.tron) {
value += " o.vmTrace(\"" + that.iLine + "\");";
}
for (i = 0; i < aNodeArgs.length; i += 1) {
value2 = aNodeArgs[i];
if (value2 !== "") {
if (!(/[}:;\n]$/).test(value2)) { // does not end with } : ; \n
value2 += ";";
} else if (value2.substr(-1) === "\n") {
value2 = value2.substr(0, value2.length - 1);
}
value += " " + value2;
}
}
if (bDirect && !that.bNoCodeFrame) {
value += "\n o.goto(\"end\"); break;\ncase \"directEnd\":"; // put in next line because of possible "rem"
}
node.pv = value;
return node.pv;
},
// special keyword functions
afterGosub: function (node) {
var aNodeArgs = fnParseArgs(node.args);
this.fnAddReferenceLabel(aNodeArgs[2], node.args[2]); // argument 2 = line number
node.pv = "o." + node.type + "(" + aNodeArgs.join(", ") + ")";
return node.pv;
},
call: function (node) {
node.pv = this.fnCommandWithGoto(node);
return node.pv;
},
chain: function (node) {
node.pv = this.fnCommandWithGoto(node);
return node.pv;
},
chainMerge: function (node) {
that.bMergeFound = true;
node.pv = this.fnCommandWithGoto(node);
return node.pv;
},
clear: function (node) { // will also do e.g. closeout
node.pv = this.fnCommandWithGoto(node);
return node.pv;
},
closeout: function (node) {
node.pv = this.fnCommandWithGoto(node);
return node.pv;
},
cont: function (node) {
node.pv = "o." + node.type + "(); break;"; // append break
return node.pv;
},
data: function (node) {
var aNodeArgs = fnParseArgs(node.args);
aNodeArgs.unshift(String(that.iLine)); // prepend line number
that.aData.push("o.data(" + aNodeArgs.join(", ") + ")"); // will be set at the beginning of the script
node.pv = "/* data */";
return node.pv;
},
def: function (node) { // somehow special because we need to get plain variables
var aNodeArgs, sName, sExpression, sVarType, sValue;
sName = fnParseOneArg(node.left);
oDefScopeArgs = {}; // collect DEF scope args
aNodeArgs = fnParseArgs(node.args);
oDefScopeArgs.bCollectDone = true; // collection done => now use them
sExpression = fnParseOneArg(node.right);
oDefScopeArgs = undefined;
fnPropagateStaticTypes(node, node.left, node.right, "II RR IR RI $$");
sVarType = fnDetermineStaticVarType(sName);
if (node.pt) {
if (node.left.pt === "I" && node.right.pt === "R") { // special handing for IR: rounding needed
sValue = "o.vmRound(" + sExpression + ")";
node.pt = "I"; // "R" => "I"
} else {
sValue = sExpression;
}
} else {
sValue = "o.vmAssign(\"" + sVarType + "\", " + sExpression + ")";
}
sValue = sName + " = function (" + aNodeArgs.join(", ") + ") { return " + sValue + "; };";
node.pv = sValue;
return node.pv;
},
defint: function (node) { // somehow special
node.pv = this.fnParseDefIntRealStr(node);
return node.pv;
},
defreal: function (node) { // somehow special
node.pv = this.fnParseDefIntRealStr(node);
return node.pv;
},
defstr: function (node) { // somehow special
node.pv = this.fnParseDefIntRealStr(node);
return node.pv;
},
dim: function (node) {
var aNodeArgs = [],
oNodeArg, sName, aArgs, iIndex, sFullExpression, i;
for (i = 0; i < node.args.length; i += 1) {
oNodeArg = node.args[i];
if (oNodeArg.type !== "identifier") {
throw that.composeError(Error(), "Expected identifier in DIM", node.type, node.pos);
}
aArgs = fnParseArgRange(oNodeArg.args, 1, oNodeArg.args.length - 2); // we skip open and close bracket
sFullExpression = fnParseOneArg(oNodeArg);
sName = sFullExpression;
sName = sName.substr(2); // remove preceding "v."
iIndex = sName.indexOf("["); // we should always have it
sName = sName.substr(0, iIndex);
aNodeArgs.push("/* " + sFullExpression + " = */ o.dim(\"" + sName + "\", " + aArgs.join(", ") + ")");
}
node.pv = aNodeArgs.join("; ");
return node.pv;
},
"delete": function (node) {
var aNodeArgs = fnParseArgs(node.args),
sName = Utils.bSupportReservedNames ? "o.delete" : 'o["delete"]';
if (!aNodeArgs.length) { // no arguments? => complete range
aNodeArgs.push("1");
aNodeArgs.push("65535");
}
node.pv = sName + "(" + aNodeArgs.join(", ") + "); break;";
return node.pv;
},
edit: function (node) {
var aNodeArgs = fnParseArgs(node.args);
node.pv = "o.edit(" + aNodeArgs.join(", ") + "); break;"; // we need break
return node.pv;
},
"else": function (node) { // similar to a comment, with unchecked tokens
var aArgs = node.args,
sValue = node.type,
oToken, i;
for (i = 0; i < aArgs.length; i += 1) {
oToken = aArgs[i];
if (oToken.value) {
sValue += " " + oToken.value;
}
}
node.pv = "// " + sValue + "\n";
return node.pv;
},
end: function (node) {
var sName = that.iLine + "s" + that.iStopCount; // same as stop, use also stopCount
that.iStopCount += 1;
node.pv = "o.end(\"" + sName + "\"); break;\ncase \"" + sName + "\":";
return node.pv;
},
erase: function (node) { // somehow special because we need to get plain variables
var value = this.fnParseErase(node);
node.pv = value;
return node.pv;
},
error: function (node) {
var aNodeArgs = fnParseArgs(node.args);
node.pv = "o.error(" + aNodeArgs[0] + "); break";
return node.pv;
},
everyGosub: function (node) {
var aNodeArgs = fnParseArgs(node.args);
this.fnAddReferenceLabel(aNodeArgs[2], node.args[2]); // argument 2 = line number
node.pv = "o." + node.type + "(" + aNodeArgs.join(", ") + ")";
return node.pv;
},
fn: function (node) {
var aNodeArgs = fnParseArgs(node.args),
sName = fnParseOneArg(node.left);
if (node.left.pt) {
node.pt = node.left.pt;
}
node.pv = sName + "(" + aNodeArgs.join(", ") + ")";
return node.pv;
},
"for": function (node) {
var aNodeArgs = fnParseArgs(node.args),
sVarName, sLabel, value, startValue, endValue, stepValue, startNode, endNode, stepNode, bStartIsIntConst, bEndIsIntConst, bStepIsIntConst, sStepName, sEndName, sVarType, sType, sEndNameOrValue;
sVarName = aNodeArgs[0];
sLabel = that.iLine + "f" + that.iForCount;
that.oStack.forLabel.push(sLabel);
that.oStack.forVarName.push(sVarName);
that.iForCount += 1;
startNode = node.args[1];
endNode = node.args[2];
stepNode = node.args[3];
startValue = aNodeArgs[1];
endValue = aNodeArgs[2];
stepValue = aNodeArgs[3];
if (stepNode.type === "null") { // value not available?
stepValue = "1";
}
// optimization for integer constants (check value and not type, because we also want to accept e.g. -<number>)
bStartIsIntConst = fnIsIntConst(startValue);
bEndIsIntConst = fnIsIntConst(endValue);
bStepIsIntConst = fnIsIntConst(stepValue);
sVarType = fnDetermineStaticVarType(sVarName);
sType = (sVarType.length > 1) ? sVarType.charAt(1) : "";
if (sType === "$") {
throw that.composeError(Error(), "String type in FOR at", node.type, node.pos);
}
if (!bStartIsIntConst) {
if (startNode.pt !== "I") {
startValue = "o.vmAssign(\"" + sVarType + "\", " + startValue + ")"; // assign checks and rounds, if needed
}
}
if (!bEndIsIntConst) {
if (endNode.pt !== "I") {
endValue = "o.vmAssign(\"" + sVarType + "\", " + endValue + ")";
}
sEndName = sVarName + "End";
value = sEndName.substr(2); // remove preceding "v."
fnDeclareVariable(value); // declare also end variable
}
if (!bStepIsIntConst) {
if (stepNode.pt !== "I") {
stepValue = "o.vmAssign(\"" + sVarType + "\", " + stepValue + ")";
}
sStepName = sVarName + "Step";
value = sStepName.substr(2); // remove preceding "v."
fnDeclareVariable(value); // declare also step variable
}
value = "/* for() */";
if (sType !== "I") {
value += " o.vmAssertNumberType(\"" + sVarType + "\");"; // do a type check: assert number type
}
value += " " + sVarName + " = " + startValue + ";";
if (!bEndIsIntConst) {
value += " " + sEndName + " = " + endValue + ";";
}
if (!bStepIsIntConst) {
value += " " + sStepName + " = " + stepValue + ";";
}
value += " o.goto(\"" + sLabel + "b\"); break;";
value += "\ncase \"" + sLabel + "\": ";
value += sVarName + " += " + (bStepIsIntConst ? stepValue : sStepName) + ";";
value += "\ncase \"" + sLabel + "b\": ";
sEndNameOrValue = bEndIsIntConst ? endValue : sEndName;
if (bStepIsIntConst) {
if (stepValue > 0) {
value += "if (" + sVarName + " > " + sEndNameOrValue + ") { o.goto(\"" + sLabel + "e\"); break; }";
} else if (stepValue < 0) {
value += "if (" + sVarName + " < " + sEndNameOrValue + ") { o.goto(\"" + sLabel + "e\"); break; }";
} else { // stepValue === 0 => endless loop, if starting with var < end
value += "if (" + sVarName + " < " + sEndNameOrValue + ") { o.goto(\"" + sLabel + "e\"); break; }";
}
} else {
value += "if (" + sStepName + " > 0 && " + sVarName + " > " + sEndNameOrValue + " || " + sStepName + " < 0 && " + sVarName + " < " + sEndNameOrValue + ") { o.goto(\"" + sLabel + "e\"); break; }";
}
node.pv = value;
return node.pv;
},
frame: function (node) {
node.pv = this.fnCommandWithGoto(node);
return node.pv;
},
gosub: function (node) {
var aNodeArgs = fnParseArgs(node.args),
iLine = aNodeArgs[0],
sName = that.iLine + "g" + that.iGosubCount;
that.iGosubCount += 1;
this.fnAddReferenceLabel(iLine, node.args[0]);
node.pv = 'o.gosub("' + sName + '", ' + iLine + '); break; \ncase "' + sName + '":';
return node.pv;
},
"goto": function (node) {
var aNodeArgs = fnParseArgs(node.args),
iLine = aNodeArgs[0];
this.fnAddReferenceLabel(iLine, node.args[0]);
node.pv = "o.goto(" + iLine + "); break";
return node.pv;
},
"if": function (node) {
var aNodeArgs, sLabel, value, sPart;
sLabel = that.iLine + "i" + that.iIfCount;
that.iIfCount += 1;
if (!node.left) {
throw this.composeError(Error(), "Programming error: Undefined left", node.type, node.pos); // should not occure
}
value = "if (" + fnParseOneArg(node.left) + ') { o.goto("' + sLabel + '"); break; } ';
if (node.args2) {
aNodeArgs = fnParseArgs(node.args2);
sPart = aNodeArgs.join("; ");
value += "/* else */ " + sPart + "; ";
}
value += 'o.goto("' + sLabel + 'e"); break;';
aNodeArgs = fnParseArgs(node.args); // "then" statements
sPart = aNodeArgs.join("; ");
value += '\ncase "' + sLabel + '": ' + sPart + ";";
value += '\ncase "' + sLabel + 'e": ';
node.pv = value;
return node.pv;
},
input: function (node) { // input or lineInput
var aNodeArgs = fnParseArgs(node.args),
aVarTypes = [],
sLabel, value, i, sStream, sNoCRLF, sMsg, sPrompt;
sLabel = that.iLine + "s" + that.iStopCount;
that.iStopCount += 1;
sStream = aNodeArgs.shift();
sNoCRLF = aNodeArgs.shift();
if (sNoCRLF === ";") { // ; or null
sNoCRLF = '"' + sNoCRLF + '"';
}
sMsg = aNodeArgs.shift();
if (node.args[2].type === "null") { // message type
sMsg = '""';
}
sPrompt = aNodeArgs.shift();
if (sPrompt === ";" || node.args[3].type === "null") { // ";" => insert prompt "? " in quoted string
sMsg = sMsg.substr(0, sMsg.length - 1) + "? " + sMsg.substr(-1, 1);
}
for (i = 0; i < aNodeArgs.length; i += 1) {
aVarTypes[i] = fnDetermineStaticVarType(aNodeArgs[i]);
}
value = "o.goto(\"" + sLabel + "\"); break;\ncase \"" + sLabel + "\":"; // also before input
sLabel = that.iLine + "s" + that.iStopCount;
that.iStopCount += 1;
value += "o." + node.type + "(" + sStream + ", " + sNoCRLF + ", " + sMsg + ", \"" + aVarTypes.join('", "') + "\"); o.goto(\"" + sLabel + "\"); break;\ncase \"" + sLabel + "\":";
for (i = 0; i < aNodeArgs.length; i += 1) {
value += "; " + aNodeArgs[i] + " = o.vmGetNextInput()";
}
node.pv = value;
return node.pv;
},
let: function (node) {