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now guarded under `dead_code`
fixes #1705
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fixes #1704
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fixes #1698
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`statement_to_expression()` drops `typeof` even if it operates on undeclared variables.
Since we now have `drop_side_effect_free()`, replace and remove this deprecated functionality.
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fixes #1690
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Unlike normal variables and even function definitions, these cannot be reassigned, even though assignment expressions would "leak" the assigned value as normal.
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Process variable definitions with or without assigned values against:
- `arguments`
- named function arguments
- multiple definitions within same scope
Essentially demote variable declarations with no value assignments.
Also fixed invalid use of `AST_VarDef` over `arguments` - should use a member of `AST_SymbolDeclaration` instead.
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fixes #1686
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Conditions including strict mode would make `delete` return `true` or `false`, and are too complex to be evaluated by the compressor.
Suppress assignment folding into said operator.
fixes #1685
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- de-duplicate trailing cases only, avoid all potential side-effects
- enable switch statement fuzzing
fixes #1680
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fixes #1679
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extension of #1675
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@qfox Put value constants in a global constant 74c0fb9
@qfox And the other string based values as well a5033c5
@qfox Be more strict about parameters, allow max to be optional 9c7ce70
@qfox Support a `V` (capital) flag to only log out at intervals 2d822c7
@qfox Fewer magic variables a6a9a7c
@qfox Fix decrement such that a function is created when n=1 7e4b017
@qfox Add more values 64e596e
@qfox Make `b` appear more often d33191a
@qfox Add functions that contain (only..) functions 29a86e3
@qfox Allow the block statement to contain multiple statements 7570484
@qfox Make the interval count a constant d587ad8
@qfox Enable mangling, disable post-processing … 4dc8d35
@qfox Add more simple value that may trigger syntactic errors 8496d58
@qfox Add `else` to some `if` statements a4aed65
@qfox Move iife to expr generator, fix missing recursion arg e453159
@qfox Improve output on error where it wasnt printing the last code properly 4565a1a
@qfox Add switch statement to generator ceafa76
@qfox Add var statement, support optional comma for expr generator b83921b
@qfox Expression generator should use a simple value instead of `0` as recu… … 9d1a5c7
@qfox const -> var to keep things es5... 0143099
@qfox Add more simple values that may trigger edge cases 5e124f1
@qfox Add central name generator, take special care for global functions aeb7682
@qfox Add some `return` and function declaration cases to statement generator 6c9c3cc
@qfox Exclude switches from generator for now 91124b2
Put value constants in a global constant
And the other string based values as well
Be more strict about parameters, allow max to be optional
Support a `V` (capital) flag to only log out at intervals
Fewer magic variables
Fix decrement such that a function is created when n=1
Add more values
Make `b` appear more often
Add functions that contain (only..) functions
Allow the block statement to contain multiple statements
Make the interval count a constant
Enable mangling, disable post-processing
Mangling is kind of the whole point...
Similarly, to beautify the minified code afterwards may supress bugs so it's probably best not to beautify the code prematurely. And there's no point anyways since you won't see it most of the time and only care about the main input anyways.
Add more simple value that may trigger syntactic errors
Add `else` to some `if` statements
Move iife to expr generator, fix missing recursion arg
Improve output on error where it wasnt printing the last code properly
Add switch statement to generator
Add var statement, support optional comma for expr generator
Expression generator should use a simple value instead of `0` as recursion default
const -> var to keep things es5...
Add more simple values that may trigger edge cases
Add central name generator, take special care for global functions
Add some `return` and function declaration cases to statement generator
Exclude switches from generator for now
Enable switch generation because #1667 was merged
Add typeof generator
Add some elision tests
Add a new edge case that returns an object explicitly
Add all binary ops to try and cover more paths
Forgot four binops and added `Math` to var name pool
Harden the incremental pre/postfix tests
Improve switch generator, allow `default` to appear at any clause index
Add try/catch/finally generation
Prevent function statements being generated
Add edge case with decremental op and a group
Disable switch generation until #1679 and #1680 are solved
Only allow `default` clause as last clause for now
Tentatively enable `throw`, `break` and `continue` statements when in valid contexts
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- correctly determine reachability of (default) branches
- gracefully handle multiple default branches
- optimise branches with duplicate bodies
fixes #376
fixes #441
fixes #1674
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`AST_Try` is an `AST_Block`, so besides try block we also need to inspect catch and finally blocks for possible side effects.
Also extend this functionality to handle `AST_If` and `AST_LabeledStatement` while we are at it.
fixes #1673
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Take conditional nature of switch branches into account.
fixes #1670
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`has_side_effects()` does not take `typeof`'s magical power of not tripping over undeclared variable into account.
fixes #1668
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Need to call `extract_declarations_from_unreachable_code()`.
fixes #1663
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Turns out the only place in `Compressor` which can generate invalid `AST_For.init` is within `drop_unused()`, so focus the fix-up efforts.
supercedes #1652
fixes #1656
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closes #1647
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Operator has changed, so break out from rest of the rules.
fixes #1649
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Enforce `null` as value for empty initialisation blocks.
fixes #1648
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fixes #1645
fixes #1646
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take side effects of binary boolean operations into account
fixes #1639
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For AST_UnaryPrefix, points to the operator rather than end of expression.
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`compress()` may modify input ASTs
add tests for #1627 & #1640
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fixes #1637
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- #1634 bars variables with cross-scope references in between to collapse
- but if assigned value is side-effect-free, no states can be modified, so it is safe to move
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mostly done by @kzc
fixes #1631
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report the following only when `options.warnings = "verbose"`
- unused elements due to inlining
- collpased variables
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- "?" should not match "/"
- other minor clean-ups
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- mention performance anomaly in Node 7 and drop from CI
- remove unused npm "scripts"
- mark browserify dependency as optional
- stop `test/mozilla-ast.js` from spamming console output in later versions of Node.js
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fixes #1626
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That particular version of Node.js has messed up error messages, so provide a version-specific workaround.
Also fixed an formatting issue which would cause `expect_stdout` to fail if error message contains excerpts of input.
Apply `expect_stdout` to more applicable tests.
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The following is wrong:
`a == (b ? a : c)` => `b`
Because:
- `b` may not be boolean
- `a` might have side effects
- `a == a` is not always `true` (think `NaN`)
- `a == c` is not always `false`
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Commit eab99a1c fails to account for side effects from compound assignments.
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Guarded by `unsafe` as `charAt()` can be overridden.
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allow test to pass if both `input` and `expect` throws the same kind of error
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`input` and `expect` are parsed as `AST_BlockStatement` which does not support `AST_Directive` by default.
Emulate that by transforming preceding `AST_SimpleStatement`s of `AST_String` into `AST_Directive`.
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`reduce_vars` enables substitution of variables but did not clone the value's `AST_Node`.
This confuses `collapse_vars` and result in invalid AST and subsequent crash.
fixes #1609
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fixes #1588
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