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Indirect ops so that they can access interpreter state

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This commit is contained in:
Chris Jones 2011-05-05 12:08:36 -05:00
parent 07119364fc
commit e464d31d18
1 changed files with 98 additions and 64 deletions
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162
pdf.js
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@ -655,55 +655,100 @@ var Interpreter = (function() {
const MAX_ARGS = 33; const MAX_ARGS = 33;
const CMD_TABLE = { const CMD_TABLE = {
// Graphics state // Graphics state
"w" : { fn: "setLineWidth", w : { params: [ "Num" ],
params: [ "Num" ] }, op: function(args) {
"d" : { fn: "setDash", this.gfx.setLineWidth(args[0]);
params: [ "Array", "Num" ] }, } },
"q" : { fn: "save", d : { params: [ "Array", "Num" ],
params: [ ] }, op: function(args) {
"Q" : { fn: "restore", this.gfx.setDash(args[0], args[1]);
params: [ ] }, } },
"cm": { fn: "transform", q : { params: [ ],
params: [ "Num", "Num", "Num", "Num", "Num", "Num" ] }, op: function(args) {
this.gfx.save();
} },
Q : { params: [ ],
op: function(args) {
this.gfx.restore();
} },
cm: { params: [ "Num", "Num", "Num", "Num", "Num", "Num" ],
op: function(args) {
this.gfx.transform(args[0], args[1], args[2], args[3], args[4], args[5]);
} },
// Path // Path
"m" : { fn: "moveTo", m : { params: [ "Num", "Num" ],
params: [ "Num", "Num" ] }, op: function(args) {
"l" : { fn: "lineTo", this.gfx.moveTo(args[0], args[1]);
params: [ "Num", "Num" ] }, } },
"c" : { fn: "curveTo", l : { params: [ "Num", "Num" ],
params: [ "Num", "Num", "Num", "Num", "Num", "Num" ] }, op: function(args) {
"h" : { fn: "closePath", this.gfx.lineTo(args[0], args[1]);
params: [ ] }, } },
"re": { fn: "rectangle", c : { params: [ "Num", "Num", "Num", "Num", "Num", "Num" ],
params: [ "Num", "Num", "Num", "Num" ] }, op: function(args) {
"S" : { fn: "stroke", this.gfx.curveTo(args[0], args[1], args[2], args[3], args[4], args[5]);
params: [ ] }, } },
"f" : { fn: "fill", h : { params: [ ],
params: [ ] }, op: function(args) {
"B" : { fn: "fillStroke", this.gfx.closePath();
params: [ ] }, } },
"b" : { fn: "closeFillStroke", re: { params: [ "Num", "Num", "Num", "Num" ],
params: [ ] }, op: function(args) {
this.gfx.rectangle(args[0], args[1], args[2], args[3]);
} },
S : { params: [ ],
op: function(args) {
this.gfx.stroke();
} },
f : { params: [ ],
op: function(args) {
this.gfx.fill();
} },
B : { params: [ ],
op: function(args) {
this.gfx.fillStroke();
} },
b : { params: [ ],
op: function(args) {
this.gfx.closeFillStroke();
} },
// Clipping // Clipping
// Text // Text
"BT": { fn: "beginText", BT: { params: [ ],
params: [ ] }, op: function(args) {
"ET": { fn: "endText", this.gfx.beginText();
params: [ ] }, } },
"Tf": { fn: "setFont", ET: { params: [ ],
params: [ "Name", "Num" ] }, op: function(args) {
"Td": { fn: "moveText", this.gfx.endText();
params: [ "Num", "Num" ] }, } },
"Tj": { fn: "showText", Tf: { params: [ "Name", "Num" ],
params: [ "String" ] }, op: function(args) {
var font = args[0] // XXX look up
this.gfx.setFont(font, args[1]);
} },
Td: { params: [ "Num", "Num" ],
op: function(args) {
this.gfx.moveText(args[0], args[1]);
} },
Tj: { params: [ "String" ],
op: function(args) {
this.gfx.showText(args[0]);
} },
// Type3 fonts // Type3 fonts
// Color // Color
"g" : { fn: "setFillGray", g : { params: [ "Num" ],
params: [ "Num" ] }, op: function(args) {
"RG": { fn: "setStrokeRGBColor", this.gfx.setFillGray(args[0]);
params: [ "Num", "Num", "Num" ] }, } },
"rg": { fn: "setFillRGBColor", RG: { params: [ "Num", "Num", "Num" ],
params: [ "Num", "Num", "Num" ] }, op: function(args) {
this.gfx.setStrokeRGBColor(args[0], args[1], args[2]);
} },
rg: { params: [ "Num", "Num", "Num" ],
op: function(args) {
this.gfx.setFillRGBColor(args[0], args[1], args[2]);
} },
// Shading // Shading
// Images // Images
// XObjects // XObjects
@ -720,7 +765,15 @@ var Interpreter = (function() {
var obj; var obj;
while (!((obj = parser.getObj()).isEOF())) { while (!((obj = parser.getObj()).isEOF())) {
if (obj.isCmd()) { if (obj.isCmd()) {
this.dispatch(obj, args); var cmd = obj.value;
if (!(cmd in CMD_TABLE))
this.error("Unknown command '"+ cmd +"'");
var op = CMD_TABLE[cmd];
if (!this.typeCheck(op.params, args))
this.error("Wrong arguments for command '"+ cmd +"'");
op.op.call(this, args.map(function (a) a.lowerToJS()));
args.length = 0; args.length = 0;
} else if (MAX_ARGS == args.length) { } else if (MAX_ARGS == args.length) {
this.error("Too many arguments"); this.error("Too many arguments");
@ -729,25 +782,6 @@ var Interpreter = (function() {
} }
} }
}, },
dispatch: function(cmdObj, args) {
var fnName = this.getAndCheckCmd(cmdObj, args);
if (!(fnName in this.gfx))
this.error("Unimplemented function '"+ fnName +"'");
this.gfx[fnName].apply(this.gfx,
args.map(function(o) o.lowerToJS()));
},
getAndCheckCmd: function(cmdObj, args) {
var cmdName = cmdObj.value
var cmd = CMD_TABLE[cmdName];
if (!cmd) {
this.error("Unknown command '"+ cmdName +"'");
} else if (!this.typeCheck(cmd.params, args)) {
this.error("Wrong arguments for command '"+ cmdName +"'");
}
return cmd.fn;
},
typeCheck: function(params, args) { typeCheck: function(params, args) {
if (params.length != args.length) if (params.length != args.length)
return false; return false;