add support for optional chaining#412

Merged

michaelficarra merged 17 commits intoestools:masterfrom

javascript-obfuscator:optional-chaining-support

Aug 5, 2020

Commits on Aug 5, 2020

Added optional chaining support WIP
sanex3339
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Updated optional chaining support to the latest spec
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Updated tests to match examples from spec
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Updated tests with correct expectations
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Updated optional chaining parenthesis and added more tests
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Updated optional chaining support, added AST comparison tests
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Updated Chai to version 4.2.0
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Moved expression object flags to the variable
sanex3339
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Fixed optional CallExpression's. Added tests.
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Fixed optional chaining with literal member expression object
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Fixed mixed optional chaining precedence. Added more tests.
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Simplified logic of ChainExpression precedence detection
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Added OptionalChaining precedence and simplified logic
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Moved flags from variables to the calls
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Added tests with optional chaining as a part of `NewExpression` `callee`
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Removed redundant trailing parenthesis from NewExpression with ChainExpression callee without arguments
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Reverted logic to keep parenthesis of NewExpression with ChainExpression callee without arguments
sanex3339
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