pglr parse command - Githubissues

This command would be used to parse inputs from command line and print parse trees.

Examples:

pglr parse <grammar> <input_file>

Command would accept various switches:

--prefer-shifts/--prefer-shifts-over-empty -- choosing strategies
--glr/lr -- which parser to use, GLR or LR
--save-trees=n -- in case of ambiguity this would produce files with one tree per file up to n number of trees (some sensible default could be there so just using --save-trees would be enough). This will be handy for investigating ambiguities as the standard diff tools can be used over saved trees.
--save-intermediate-trees=n - similar to --save-trees but will save current trees at each shift step. Useful for analysis of ambiguity which results in a huge number of trees where the parse takes to long to complete (see #121).
-i -- like in trace command provides giving the input to be parsed directly on command line.

Some examples:

pglr parse calc.pg -i "2+3*5/7+(2-1)"
pglr parse ambiguous.pg myinput.amb --glr --save-trees=20

igordejanovic / parglare