I have just committed (in r59883) some changes to the R parser based on Romain Francois' parser package. Packages that made use of parser will hopefully find that the information in base R gives them what they need to work with, but the data is not identical to what parser recorded (since it was not consistent with some things already in R). One reason for the change was that the parser in the parser package was slightly different than the one in R; the hope is that by providing the services in R, it will make maintenance easier for things like code analysis, pretty printing, etc.

See ?getParseData for details, and if you are maintaining a package that depends on parser, feel free to ask me for help in the transition, or make suggestions for changes if I've done something that causes you too much trouble.

Duncan Murdoch

P.S. to Qiang Li: as mentioned privately, the goal for this change was to reproduce output equivalent to what parser did, so I have not incorporated your suggested change to outlaw expressions like "x[[1] ]" (with an embedded space where it shouldn't be). After things settle down we can consider that change and others.

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