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Ignore double negative in Lexer_getNumber (issue 6218)

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Basic mathematics would suggest that a double negative should always become positive, but it appears that Adobe Reader simply ignores that case. Hence I think that it makes sense for us to do the same.

Fixes 6218.
This commit is contained in:
Jonas Jenwald 2015-07-16 12:11:49 +02:00
parent cf6d40f348
commit c718d1ab10
2 changed files with 12 additions and 0 deletions
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5
src/core/parser.js
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@ -671,6 +671,11 @@ var Lexer = (function LexerClosure() {
if (ch === 0x2D) { // '-'
sign = -1;
ch = this.nextChar();
if (ch === 0x2D) { // '-'
// Ignore double negative (this is consistent with Adobe Reader).
ch = this.nextChar();
}
} else if (ch === 0x2B) { // '+'
ch = this.nextChar();
}

7
test/unit/parser_spec.js
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@ -27,6 +27,13 @@ describe('parser', function() {
}
});
it('should ignore double negative before number', function() {
var input = new StringStream('--205.88');
var lexer = new Lexer(input);
var result = lexer.getNumber();
expect(result).toEqual(-205.88);
});
it('should handle glued numbers and operators', function() {
var input = new StringStream('123ET');