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Change PartialEvaluator.handleColorN to throw when no valid pattern is found

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Currently `handleColorN` will fallback to add a completely unparsed/unvalidated operator when no valid pattern was found. This is unfortunate, since it could very easily lead to a couple of different errors:
 - `DataCloneError`s when attempting to send the data to the main-thread, e.g. when `args` is `Dict`/`Stream`.
 - Errors in `getShadingPatternFromIR` on the main-thread, unless `args` just happens to have the expected format.
 - Errors when actually attempting to render the pattern on the main-thread, since the `args` will most likely not have the expected format.

Hence it probably makes sense to error in `PartialEvaluator.handleColorN`, and having invalid patterns fail gracefully via the existing `ignoreErrors` code-paths instead.
This commit is contained in:
Jonas Jenwald 2019-05-04 12:39:58 +02:00
parent 155304a0c1
commit 007fab6ab5
1 changed files with 4 additions and 8 deletions
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12
src/core/evaluator.js
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@ -853,9 +853,7 @@ var PartialEvaluator = (function PartialEvaluatorClosure() {
}
},
handleColorN: function PartialEvaluator_handleColorN(operatorList, fn, args,
cs, patterns,
resources, task) {
async handleColorN(operatorList, fn, args, cs, patterns, resources, task) {
// compile tiling patterns
var patternName = args[args.length - 1];
// SCN/scn applies patterns along with normal colors
@ -875,13 +873,11 @@ var PartialEvaluator = (function PartialEvaluatorClosure() {
pattern = Pattern.parseShading(shading, matrix, this.xref, resources,
this.handler, this.pdfFunctionFactory);
operatorList.addOp(fn, pattern.getIR());
return Promise.resolve();
return undefined;
}
return Promise.reject(new Error('Unknown PatternType: ' + typeNum));
throw new FormatError(`Unknown PatternType: ${typeNum}`);
}
// TODO shall we fail here?
operatorList.addOp(fn, args);
return Promise.resolve();
throw new FormatError(`Unknown PatternName: ${patternName}`);
},
getOperatorList({ stream, task, resources, operatorList,