This patch implements source map support in the parser, the runtime, the
script record, and the stack trace printing.
The library used to parse and use the source maps is gopkg.in/sourcemap.v1.
Unlike earlier versions of this patch, the consumer of otto does not need
parse the source map on their own - it's now handled similarly to parsing
JavaScript content.
To use a source map, the consumer must explicitly parse their source into
a `Script` object with `Otto.CompileWithSourceMap`. The script record
returned from that call will carry source map information with it, and
all location-related functions should reflect the original source
positions.
Previously, it was a publically accessible but invalid value (valueEmpty).
* Deprecate internal use of UndefinedValue(), NullValue(), FalseValue(), TrueValue()
* Guard against Empty, Result, Reference values from escaping the package
* Streamline what we get from "otto/parser"
* Get rid of some "otto/parser" cruft
* FunctionExpression => FunctionLiteral
* The debugger statement (debugger) should do nothing (not panic)
* Fix aspects of function expression call evaluation
* Faster, more straightforward, etc.
* More advanced object literals (get ..., set ...)
* More tests using JavaScript from the wild (http://cdnjs.com/)
Basically, check that start is less than length before trying
to take a slice.
Also, rename valueToArrayIndex to valueToRangeIndex to reflect
the fact that it does not always return a value that is valid
index (value could be length)
Use octal to designate write/enumerate/configure (experimental)
Move extensibility responsibility into the stash
Rename propertyStash => objectStash (be congruent with arrayStash, etc.)
Get rid of a bunch of useless methods
Privatize everything ([A-Z] => [a-z_])
gofmt
