Starts playing with the execution stack
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Vivien Nicolas
parent
e936f305d7
commit
e739bcc515
148
PDFFont.js
148
PDFFont.js
@ -155,9 +155,19 @@ var Type1Parser = function(aAsciiStream, aBinaryStream) {
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},
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peek: function() {
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if (!this.length)
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return null;
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return this.__innerStack__[this.__innerStack__.length - 1];
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},
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toString: function() {
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log("=== Start Dumping operandStack ===");
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var str = [];
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for (var i = 0; i < this.__innerStack__.length; i++)
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log(this.__innerStack__[i]);
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log("=== End Dumping operandStack ===");
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},
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get length() {
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return this.__innerStack__.length;
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}
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@ -194,9 +204,15 @@ var Type1Parser = function(aAsciiStream, aBinaryStream) {
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},
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peek: function() {
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if (!this.length)
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return null;
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return this.__innerStack__[this.__innerStack__.length - 1];
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},
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get: function(aIndex) {
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return this.__innerStack__[aIndex];
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},
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get length() {
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return this.__innerStack__.length;
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}
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@ -212,7 +228,42 @@ var Type1Parser = function(aAsciiStream, aBinaryStream) {
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* object off the execution stack and resumes executing the suspended object
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* beneath it.
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*/
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var executionStack = [];
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var executionStack = {
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__innerStack__: [],
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push: function(aProcedure) {
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this.__innerStack__.push(aProcedure);
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},
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pop: function() {
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return this.__innerStack__.pop();
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},
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peek: function() {
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if (!this.length)
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return null;
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return this.__innerStack__[this.__innerStack__.length - 1];
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},
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get: function(aIndex) {
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return this.__innerStack__[aIndex];
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},
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get length() {
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return this.__innerStack__.length;
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}
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}
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function nextInStack() {
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var currentProcedure = executionStack.peek();
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if (currentProcedure) {
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var command = currentProcedure.shift();
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if (!currentProcedure.length)
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executionStack.pop();
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}
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return lexer.getObj();
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}
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/*
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@ -222,29 +273,65 @@ var Type1Parser = function(aAsciiStream, aBinaryStream) {
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* The method thrown an error if it encounters an unknown token.
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*/
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this.getObj = function() {
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var obj = lexer.getObj();
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var obj = nextInStack();
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if (operandIsArray && !IsCmd(obj, "{") && !IsCmd(obj, "[") &&
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!IsCmd(obj, "}") && !IsCmd(obj, "]")) {
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dump("Adding: " + obj);
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operandStack.peek().push(obj);
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this.getObj();
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} else if (IsCmd(obj, "{") || IsCmd(obj, "[")) {
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dump("Start Array: " + obj);
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operandStack.push([]);
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dump("Start" + (obj.cmd == "{" ? " Executable " : " ") + "Array");
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operandIsArray ? operandStack.peek().push([]) : operandStack.push([]);
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operandIsArray++;
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this.getObj();
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} else if (IsCmd(obj, "}") || IsCmd(obj, "]")) {
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dump("End Array: " + obj);
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dump("End" + (obj.cmd == "}" ? " Executable " : " ") + "Array");
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operandIsArray--;
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this.getObj();
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} else if (IsCmd(obj, "if")) {
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log("if");
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var procedure = operandStack.pop();
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var bool = operandStack.pop();
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if (!IsBool(bool)) {
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executionStack.push(bool);
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log(".....");
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this.getObj();
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}
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log(bool);
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if (bool)
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executionStack.push(procedure);
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this.getObj();
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} else if (IsCmd(obj, "ifelse")) {
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log("ifelse");
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var procedure1 = operandStack.pop();
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var procedure2 = operandStack.pop();
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var bool = !!operandStack.pop();
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operandStack.push(bool ? procedure1 : procedure2);
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this.getObj();
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} else if (IsBool(obj) || IsInt(obj) || IsNum(obj) || IsString(obj)) {
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//dump("Value: " + obj);
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dump("Value: " + obj);
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operandStack.push(obj);
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this.getObj();
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} else if (IsCmd(obj, "dup")) {
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dump("Duplicate");
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operandStack.push(operandStack.peek());
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this.getObj();
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} else if (IsCmd(obj, "put") || IsCmd(obj, "NP")) {
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operandStack.toString();
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var data = operandStack.pop();
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var indexOrKey = operandStack.pop();
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var object = operandStack.pop();
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log(object);
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log("put " + data + " in " + obj + "[" + indexOrKey + "]");
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if (object.set)
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object.set(indexOrKey, data);
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else
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object[indexOrKey] = data;
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this.getObj();
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} else if (IsCmd(obj, "currentdict")) {
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dump("currentdict");
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operandStack.push(dictionaryStack.peek());
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@ -254,13 +341,18 @@ var Type1Parser = function(aAsciiStream, aBinaryStream) {
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operandStack.push(systemDict);
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this.getObj();
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} else if (IsCmd(obj, "readonly") || IsCmd(obj, "executeonly") ||
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IsCmd(obj, "currentfile") || IsCmd(obj, "NP")) {
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IsCmd(obj, "noaccess") || IsCmd(obj, "currentfile")) {
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// Do nothing for the moment
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this.getObj();
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} else if (IsName(obj)) {
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//dump("Name: " + obj.name);
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operandStack.push(obj.name);
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this.getObj();
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} else if (IsCmd(obj, "array")) {
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var size = operandStack.pop();
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var array = new Array(size);
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operandStack.push(array);
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this.getObj();
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} else if (IsCmd(obj, "dict")) {
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dump("Dict: " + obj);
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var size = operandStack.pop();
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@ -275,10 +367,10 @@ var Type1Parser = function(aAsciiStream, aBinaryStream) {
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dump("Ending a dictionary");
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dictionaryStack.pop();
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this.getObj();
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} else if (IsCmd(obj, "def")) {
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} else if (IsCmd(obj, "def") || IsCmd(obj, "ND")) {
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var value = operandStack.pop();
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var key = operandStack.pop();
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dump("def: " + key + " = " + value);
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log("def: " + key + " = " + value);
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dictionaryStack.peek().set(key, value);
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this.getObj();
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} else if (IsCmd(obj, "eexec")) {
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@ -292,8 +384,7 @@ var Type1Parser = function(aAsciiStream, aBinaryStream) {
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dump("known");
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var name = operandStack.pop();
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var dict = operandStack.pop();
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// returns dict.hasKey(name);
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operandStack.push(!!dict.get(name));
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this.getObj();
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} else if (IsCmd(obj, "RD")) {
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dump("RD");
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@ -311,21 +402,50 @@ var Type1Parser = function(aAsciiStream, aBinaryStream) {
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dictionaryStack.peek().set(key, charStream);
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var decodedCharString = decodeCharString(charStream);
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log(decodedCharString);
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dump(decodedCharString);
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this.getObj();
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} else if (IsCmd(obj, "LenIV")) {
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error("LenIV: argh! we need to modify the length of discard characters for charStrings");
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} else if (IsCmd(obj, "closefile")) {
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// End of binary data;
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} else if (IsCmd(obj, "index")) {
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var operands = [];
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var size = operandStack.pop();
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for (var i = 0; i < size; i++)
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operands.push(operandStack.pop());
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var newOperand = operandStack.peek();
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for (var i = 0; i < operands.length; i++)
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operandStack.push(operands.pop());
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operandStack.push(newOperand);
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this.getObj();
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} else if (IsCmd(obj, "StandardEncoding")) {
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// For some reason the value is considered as a command, maybe it is
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// because of the uppercae 'S'
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operandStack.push(obj.cmd);
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this.getObj();
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} else {
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dump(obj);
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error("Unknow token while parsing font");
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var command = null;
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if (IsCmd(obj)) {
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for (var i = 0; i < dictionaryStack.length; i++) {
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command = dictionaryStack.get(i).get(obj.cmd);
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if (command)
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break;
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}
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}
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if (command) {
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// XXX add the command to the execution stack
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this.getObj();
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} else {
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log("operandStack: " + operandStack);
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log("dictionaryStack: " + dictionaryStack);
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dump(obj);
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error("Unknow token while parsing font");
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}
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}
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return operandStack.peek();
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