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Allow parsing of the "glued" commands

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This commit is contained in:
Yury Delendik 2012-05-20 13:44:03 -05:00
parent 840fe94e46
commit ec6c185cf5
3 changed files with 48 additions and 57 deletions
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64
src/evaluator.js
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@ -108,39 +108,13 @@ var PartialEvaluator = (function PartialEvaluatorClosure() {
// Compatibility
BX: 'beginCompat',
EX: 'endCompat'
EX: 'endCompat',
// (reserved partial commands for the lexer)
BM: null,
BD: null
};
function splitCombinedOperations(operations) {
// Two or more operations can be combined together, trying to find which
// operations were concatenated.
var result = [];
var opIndex = 0;
if (!operations) {
return null;
}
while (opIndex < operations.length) {
var currentOp = '';
for (var op in OP_MAP) {
if (op == operations.substr(opIndex, op.length) &&
op.length > currentOp.length) {
currentOp = op;
}
}
if (currentOp.length > 0) {
result.push(operations.substr(opIndex, currentOp.length));
opIndex += currentOp.length;
} else {
return null;
}
}
return result;
}
PartialEvaluator.prototype = {
getOperatorList: function PartialEvaluator_getOperatorList(stream,
resources,
@ -284,39 +258,19 @@ var PartialEvaluator = (function PartialEvaluatorClosure() {
resources = resources || new Dict();
var xobjs = resources.get('XObject') || new Dict();
var patterns = resources.get('Pattern') || new Dict();
var parser = new Parser(new Lexer(stream), false, xref);
var parser = new Parser(new Lexer(stream, OP_MAP), false, xref);
var res = resources;
var hasNextObj = false, nextObjs;
var args = [], obj;
var TILING_PATTERN = 1, SHADING_PATTERN = 2;
while (true) {
if (hasNextObj) {
obj = nextObjs.pop();
hasNextObj = (nextObjs.length > 0);
} else {
obj = parser.getObj();
if (isEOF(obj))
break;
}
obj = parser.getObj();
if (isEOF(obj))
break;
if (isCmd(obj)) {
var cmd = obj.cmd;
var fn = OP_MAP[cmd];
if (!fn) {
// invalid content command, trying to recover
var cmds = splitCombinedOperations(cmd);
if (cmds) {
cmd = cmds[0];
fn = OP_MAP[cmd];
// feeding other command on the next iteration
hasNextObj = true;
nextObjs = [];
for (var idx = 1; idx < cmds.length; idx++) {
nextObjs.push(Cmd.get(cmds[idx]));
}
}
}
assertWellFormed(fn, 'Unknown command "' + cmd + '"');
// TODO figure out how to type-check vararg functions