Backend skeleton and temporary testing code
This commit is contained in:
Chris Jones
parent
ef2e66bf99
commit
c46faf9e76
266
pdf.js
266
pdf.js
@ -72,11 +72,12 @@ var Obj = (function() {
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];
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for (var i = 0; i < types.length; ++i) {
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var typeName = types[i];
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constructor[typeName] = i;
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let type = i;
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var typeName = types[type];
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constructor[typeName] = type;
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constructor.prototype["is" + typeName] =
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(function (value) {
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return this.type == i &&
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return this.type == type &&
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(typeof value == "undefined" || value == this.value);
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});
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}
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@ -626,3 +627,262 @@ var PDFDoc = (function () {
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}
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};
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})();
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var Interpreter = (function() {
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function constructor(xref, resources, catalog, graphics) {
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this.xref = xref;
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this.resStack = [ resources ];
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this.catalog = catalog;
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this.gfx = graphics;
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}
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const MAX_ARGS = 33;
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constructor.prototype = {
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interpret: function(obj) {
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return this.interpretHelper(new Parser(new Lexer(obj), true));
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},
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interpretHelper: function(parser) {
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var args = [ ];
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var obj;
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while (!((obj = parser.getObj()).isEOF())) {
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if (obj.isCmd()) {
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this.dispatch(obj, args);
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args = [ ]; // yuck
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} else if (MAX_ARGS == args.length) {
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this.error("Too many arguments");
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} else {
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args.push(obj);
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}
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}
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},
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dispatch: function(cmdObj, args) {
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this.getAndCheckCmd(cmdObj, args).apply(
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this, args.map(function(o) o.value));
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},
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getAndCheckCmd: function(cmdObj, args) {
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const CMD_TABLE = {
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// Text commands
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"BT": { fn: "beginText",
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params: [ ] },
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"ET": { fn: "endText",
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params: [ ] },
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"Td": { fn: "moveText",
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params: [ "Num", "Num" ] },
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"Tf": { fn: "setFont",
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params: [ "Name", "Num" ] },
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"Tj": { fn: "showText",
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params: [ "String" ] },
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};
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var cmdName = cmdObj.value
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var cmd = CMD_TABLE[cmdName];
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if (!cmd) {
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this.error("Unknown command '"+ cmdName +"'");
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} else if (!this.typeCheck(cmd, args)) {
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this.error("Wrong arguments for command '"+ cmdName +"'");
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}
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return this[cmd.fn];
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},
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typeCheck: function(cmd, args) {
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return true;
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},
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// Text commands
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beginText: function() {
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this.gfx.beginText();
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},
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endText: function() {
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this.gfx.endText();
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},
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moveText: function(x, y) {
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this.gfx.moveText(x, y);
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},
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setFont: function(font, size) {
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// lookup font
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this.gfx.setFont(font, size);
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},
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showText: function(text) {
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this.gfx.showText(text);
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}
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};
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return constructor;
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})();
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var EchoGraphics = (function() {
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function constructor() {
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this.out = "";
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this.indentation = 0;
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this.indentationStr = "";
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}
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constructor.prototype = {
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// Graphics state
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save: function() {
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this.printdentln("q");
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},
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restore: function() {
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this.printdentln("Q");
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},
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// Text
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beginText: function() {
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this.printdentln("BT");
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this.indent();
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},
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setFont: function(font, sizePt) {
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this.printdentln("/"+ font +" "+ sizePt +" Tf");
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},
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moveText: function (x, y) {
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this.printdentln(""+ x +" "+ y +" Td");
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},
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showText: function(text) {
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this.printdentln("( "+ text +" ) Tj");
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},
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endText: function() {
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this.dedent();
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this.printdentln("ET");
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},
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// Output state
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print: function(str) {
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this.out += str;
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},
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println: function(str) {
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this.print(str);
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this.out += "\n";
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},
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printdentln: function(str) {
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this.print(this.indentationStr);
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this.println(str);
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},
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indent: function() {
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this.indentation += 2;
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this.indentationStr += " ";
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},
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dedent: function() {
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this.indentation -= 2;
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this.indentationStr = this.indentationStr.slice(0, -2);
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},
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};
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return constructor;
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})();
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var CanvasGraphicsState = (function() {
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function constructor(canvasCtx, hdpi, vdpi, pageBox) {
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// XXX canvas2d context has much of this; need to fill in what
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// canvas state doesn't store.
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this.ctx = canvasCtx;
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// Page state
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this.hdpi = hdpi
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this.vdpi = vdpi
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// ...
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// Fill state
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// ...
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// Stroke state
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// ...
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// Line state
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// ...
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// Text state
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// ...
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// Current path
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// ...
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// Transforms
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// ...
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// Clipping
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// ...
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}
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constructor.prototype = {
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// Coordinate transforms
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// ...
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// CTM mutators
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// ...
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// Path mutators
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// ...
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};
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return constructor;
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})();
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var CanvasGraphics = (function() {
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function constructor(canvasCtx, hdpi, vdpi, pageBox) {
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this.ctx = canvasCtx;
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this.current = new CanvasGraphicsState(this.ctx, hdpi, vdpi, pageBox);
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this.stateStack = [ ];
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}
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constructor.prototype = {
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save: function() {
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this.ctx.save();
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this.stateStack.push(this.current);
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// ????
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this.current = new CanvasGraphicsState(this.ctx,
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hdpi, vdpi, pageBox);
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},
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restore: function() {
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this.current = this.stateStack.pop();
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this.ctx.restore();
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},
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};
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return constructor;
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})();
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//var PostscriptGraphics
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//var SVGGraphics
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// XXX temporary testing code
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var MockParser = (function() {
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function constructor(objs) {
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this.objs = objs;
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}
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constructor.prototype = {
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getObj: function() {
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return this.objs.shift();
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}
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};
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return constructor;
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})();
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function runEchoTests() {
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function cmd(c) { return new Obj(Obj.Cmd, c); }
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function name(n) { return new Obj(Obj.Name, n); }
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function int(i) { return new Obj(Obj.Int, i); }
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function string(s) { return new Obj(Obj.String, s); }
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function eof() { return new Obj(Obj.EOF); }
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var tests = [
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{ name: "Hello world",
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objs: [
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cmd("BT"),
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name("F1"), int(24), cmd("Tf"),
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int(100), int(100), cmd("Td"),
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string("Hello World"), cmd("Tj"),
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cmd("ET"),
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eof()
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]
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},
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];
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tests.forEach(function(test) {
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putstr("Running echo test '"+ test.name +"'... ");
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var output = "";
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var gfx = new EchoGraphics(output);
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var i = new Interpreter(null, null, null, gfx);
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i.interpretHelper(new MockParser(test.objs));
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print("done. Output:");
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print(gfx.out);
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});
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}
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runEchoTests();
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