! :folding=indent:collapseFolds=1:

! $Id$
!
! Copyright (C) 2004 Slava Pestov.
! 
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! modification, are permitted provided that the following conditions are met:
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! 2. Redistributions in binary form must reproduce the above copyright notice,
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IN: errors
USE: combinators
USE: continuations
USE: kernel
USE: lists
USE: logic
USE: namespaces
USE: prettyprint
USE: stack
USE: stdio
USE: strings
USE: unparser

: standard-dump ( error -- )
    "ERROR: " write error. ;

: parse-dump ( error -- )
    [
        "error-file" get [ "<interactive>" ] unless* , ":" ,
        "error-line-number" get [ 1 ] unless* unparse , ": " ,
    ] make-string write
    error.
    
    "error-line" get print
    
    [ "error-col" get " " fill , "^" , ] make-string print ;

: in-parser? ( -- ? )
    "error-line" get "error-col" get and ;

: :s ( -- ) "error-datastack"  get {.} ;
: :r ( -- ) "error-callstack"  get {.} ;
: :n ( -- ) "error-namestack"  get [.] ;
: :c ( -- ) "error-catchstack" get {.} ;

: :get ( var -- value ) "error-namestack" get (get) ;

: default-error-handler ( error -- )
    #! Print the error and return to the top level.
    [
        in-parser? [ parse-dump ] [ standard-dump ] ifte

        [ :s :r :n :c ] [ prettyprint-word " " write ] each
        "show stacks at time of error." print
        \ :get prettyprint-word
        " ( var -- value ) inspects the error namestack." print
    ] when* ;

: print-error ( quot -- )
    #! Execute a quotation, and if it throws an error, print it
    #! and return to the caller.
    [ [ default-error-handler ] when* ] catch ;