430 lines
14 KiB
Plaintext
430 lines
14 KiB
Plaintext
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' 2009-05-02 Modified to detect when inside DAT, handle :<id> specially (for local labels)
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con
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_clkmode = xtal1 + pll8x
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_xinfreq = 10_000_000
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_stack = 1000
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obj
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f: "sxfile"
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floatString: "FltStr"
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kw: "keywords"
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bt: "bintree"
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pub Open( pFilename )
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if f.Open( pFilename, "R") <> 0
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abort string("can't open file")
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InitReadLine
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insideDAT~
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Advance ' prime the pump
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pub Close
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f.Close
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{
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bytes~
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InitReadLine
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GetNextToken ' prime the pump
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t := cnt
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repeat
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case tokenType
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EOL_TOKEN:
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term.str( @tokenText )
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EOF_TOKEN:
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quit
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ID_TOKEN:
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term.str( @tokenText )
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OP_TOKEN:
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INT_TOKEN:
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term.out( "#" )
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term.dec( tokenValue )
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FLOAT_TOKEN:
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term.out( "F" )
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term.str( floatString.FloatToString( tokenValue ) )
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term.out( "\" )
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GetNextToken
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term.out( 13 )
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'}
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{ repeat while SkipWhitespace
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term.dec( lineNo )
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term.out( "," )
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term.dec( cp+1 )
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term.out( ":" )
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if cp == lineLength
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term.str( string("(eol)"))
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else
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term.out( lineBuffer[cp++] )
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term.out( 13 )
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'}
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{
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repeat
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r := sdfat.pread( @buf, BUFFERSIZE )
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if r < 0
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quit
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bytes += r
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'}
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{
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repeat 100
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r := sdfat.pgetc
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if r < 0
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quit
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++bytes
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term.dec(r)
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term.out( "," )
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'}
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con
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MAXTOKENLENGTH = 32
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BUFFERSIZE = 200
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var
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byte tokenText[MAXTOKENLENGTH+1]
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long tokenType
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word tokenLineNumber
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word tokenCol
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long tokenValue
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byte insideDAT
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pub GetPText
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return @tokenText
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pub Type
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return tokenType
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pub Column
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return tokenCol
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pub LineNumber
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return tokenLineNumber
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pub Value
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return tokenValue
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pub Advance | i, radix, fp, x, hack
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if inStringLiteral
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if comma
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comma~
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ifnot tokenValue
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abort string("Unterminated string")
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if lineBuffer[cp] <> $22 ' double-quote
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tokenType := kw#kCOMMA
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return
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++cp
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inStringLiteral~
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else
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comma~~
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tokenType := kw#kINTLITERAL
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tokenValue := lineBuffer[cp++]
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return
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if SkipWhitespace
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if cp == lineLength
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tokenType := kw#kEOL
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bytemove( @tokenText, string("(EOL)"), 6 )
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tokenLineNumber := lineNo
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tokenCol := cp
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elseif lineBuffer[cp] == $22 ' double-quote
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tokenLineNumber := LineNo
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tokenCol := cp
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++cp
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if LineBuffer[cp] == $22
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abort string("Empty string")
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comma~
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inStringLiteral~~
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Advance
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elseif lineBuffer[cp] == "%" or lineBuffer[cp] == "$"
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tokenType := kw#kINTLITERAL
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tokenLineNumber := lineNo
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tokenCol := cp
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if lineBuffer[cp] == "%"
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if lineBuffer[cp+1] == "%"
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radix := 4
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++cp
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else
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radix := 2
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else
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radix := 16
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++cp
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ifnot IsDigit( lineBuffer[cp], radix, false )
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abort string("Bad character in number")
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tokenValue~
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repeat while IsDigit( lineBuffer[cp], radix, true )
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if lineBuffer[cp] <> "_"
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tokenValue := tokenValue * radix + DigitValue( linebuffer[cp] )
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++cp
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elseif IsDigit( lineBuffer[cp], 10, false )
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tokenLineNumber := lineNo
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tokenCol := cp
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i~
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fp~ {0 => integer
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1 => have seen .
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2 => have seen e or E
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3 => have seen + or - }
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repeat while IsDigit( lineBuffer[cp], 10, true ) {
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} or ( fp < 1 and lineBuffer[cp] == "." and lineBuffer[cp+1] <> "." ) {
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} or ( fp < 2 and (lineBuffer[cp] == "e" or lineBuffer[cp] == "E") ) {
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} or ( (fp == 1 or fp == 2) and (lineBuffer[cp] == "+" or lineBuffer[cp] == "-") )
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if lineBuffer[cp] == "."
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fp := 1
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if lineBuffer[cp] == "e" or lineBuffer[cp] == "E"
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fp := 2
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if lineBuffer[cp] == "+" or lineBuffer[cp] == "-"
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fp := 3
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if lineBuffer[cp] <> "_"
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if i => MAXTOKENLENGTH
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abort string("Token too long")
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tokenText[i++] := lineBuffer[cp]
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++cp
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tokenText[i]~
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if fp
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tokenType := kw#kFLOATLITERAL
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tokenValue := floatString.StringToFloat( @tokenText )
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else
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tokenType := kw#kINTLITERAL
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tokenValue~
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i~
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repeat while tokenText[i]
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tokenValue := tokenValue * 10 + DigitValue( tokenText[i++] )
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elseif IsAlpha( lineBuffer[cp] )
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i~
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tokenLineNumber := lineNo
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tokenCol := cp
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repeat while IsAlpha( lineBuffer[cp] ) or IsDigit( lineBuffer[cp], 10, true )
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if i => MAXTOKENLENGTH
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abort string("Token too long")
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tokenText[i++] := ToUpper( lineBuffer[cp++] )
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tokenText[i]~
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x := kw.KeywordLookup( @tokenText )
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if x
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tokenType := bt.PeekL( x )
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if kw#kCON =< tokenType and tokenType =< kw#kVAR and tokenCol == 0
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insideDAT := tokenType == kw#kDAT
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else
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tokenType := kw#kID
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else ' non-alphanumeric
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tokenLineNumber := lineNo
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tokenCol := cp
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i~
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if lineBuffer[cp] < $20 or lineBuffer[cp] => $80
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abort string("Illegal character (UNICODE?)")
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if insideDat and lineBuffer[cp] == ":" and IsAlpha( lineBuffer[cp+1] )
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tokenText[i++] := lineBuffer[cp++]
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repeat while IsAlpha( lineBuffer[cp] ) or IsDigit( lineBuffer[cp], 10, true )
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if i => MAXTOKENLENGTH
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abort string("Token too long")
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tokenText[i++] := ToUpper( lineBuffer[cp++] )
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tokenText[i]~
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tokenType := kw#kID
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else
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repeat
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if cp < lineLength
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tokenText[i++] := lineBuffer[cp++]
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else
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tokenText[i++] := " "
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++cp
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tokenText[i]~
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while x := kw.KeywordLookup( @tokenText )
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if i > 1
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tokenText[--i]~ ' shorten token by 1
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--cp
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tokenType := bt.PeekL( kw.KeywordLookup( @tokenText ) )
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else
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tokenType := kw#kUNKNOWN
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if IsBinary ' This next block is a total hack to see if a binary op
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hack := blankLine ' hack is followed by "=" making it an assignment op
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SkipWhitespace ' It parses "and ==" as "(and=) =" instead of "(and)(==)"
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if lineBuffer[cp] == "=" ' PropTool does the latter. So this is wrong, but hopefully
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tokenText[i++] := lineBuffer[cp++] ' not *too* wrong.
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tokenText[i]~
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tokenType |= kw#kASSIGNMENT
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else
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blankLine := hack ' restore (this hack is necessary to reset the eol condition trigger in SkipWhitespace)
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else
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tokenType := kw#kEOF
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bytemove( @tokenText, string("(EOF)"), 6 )
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tokenLineNumber := lineNo
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tokenCol := cp
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pri ToUpper( ch )
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if "a" =< ch and ch =< "z"
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ch += constant( "A" - "a" )
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return ch
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pri IsAlpha( ch )
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return "a" =< ch and ch =< "z" or "A" =< ch and ch =< "Z" or ch == "_"
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pri IsDigit( ch, radix, u ) | upper
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{{
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Returns non-zero if ch is an acceptable digit given radix (2, 4, 10, or 16), false otherwise.
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Pass u = true if the underscore ("_") is an acceptable value for ch.
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}}
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if ch == "_"
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return u
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upper := constant("0"-1) + radix
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if radix =< 10
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return "0" =< ch and ch =< upper
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' else radix == 16
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return "0" =< ch and ch =< "9" or "a" =< ch and ch =< "f" or "A" =< ch and ch =< "F"
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pri DigitValue( ch )
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if ch =< "9"
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return ch - "0"
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if ch =< "F"
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return ch + constant( 10 - "A" )
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if ch =< "f"
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return ch + constant( 10 - "a" )
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pub IsBinary
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{{
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Returns non-zero (not necessarily -1) if token is a binary operator.
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Returns 0 otherwise.
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}}
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return ( tokenType & constant(kw#kUNARY|kw#kBINARY) ) == kw#kBINARY
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var
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byte lineBuffer[BUFFERSIZE]
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byte lineLength
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byte lineRemainder
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byte eolLength
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word lineNo
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byte cp
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byte blankLine
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byte inStringLiteral ' indicates we are splitting up a string literal
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byte comma ' flag for returning commas when splitting up a string literal
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pri SkipWhitespace
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'' Returns true on success, false on failure (eof).
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'' lineBuffer[cp] is the next non-whitespace character
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'' (comments count as whitespace).
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repeat
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repeat while cp => lineLength
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ifnot blankLine
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blankLine~~
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return true
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ifnot ReadLine
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return false
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if lineBuffer[cp] == 9
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abort string("Illegal TAB character")
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if lineBuffer[cp] == "'" ' quote comment?
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cp := lineLength ' skip to end of line
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elseif lineBuffer[cp] == "}"
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abort string("Unexpected '}'")
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elseif lineBuffer[cp] == "{"
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SkipComment
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elseif lineBuffer[cp] == " "
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++cp
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else ' non-blank character
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blankLine~
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return true
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pri SkipComment | depth
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if cp+1 < lineLength and lineBuffer[cp+1] == "{"
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++cp
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repeat
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repeat while cp => lineLength
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ifnot ReadLine
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abort string("Unterminated comment")
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if cp+1 < lineLength and lineBuffer[cp] == "}" and lineBuffer[cp+1] == "}"
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cp += 2
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return
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++cp
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else
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++cp
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depth := 1
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repeat
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repeat while cp => lineLength
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ifnot ReadLine
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abort string("Unterminated comment")
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if lineBuffer[cp] == "{"
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++cp
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++depth
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elseif lineBuffer[cp] == "}"
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++cp
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ifnot --depth
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return
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else
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++cp
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pri InitReadLine
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lineLength~
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lineRemainder~
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eolLength~
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lineNo~
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cp~
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blankLine~~
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inStringLiteral~
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{
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|<--------------- BUFFERSIZE --------------->|
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+--------------------------------------------+
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| | | | |
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+--------------------------------------------+
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|<-lineLength ->| | |
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eolLength ->| |<- |
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|<- lineRemainder ->|
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}
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pri ReadLine | bytes, i
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'' Reads a line into lineBuff. Returns true on success, false on failure (eof)
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'' The line in lineBuff is terminated with a null byte. Calling programs should
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'' not modify any memory in lineBuff after the null (the "remainder" section in
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'' the diagram above) because that's the following line(s).
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' First, move remainder up to start of buffer
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bytemove( @lineBuffer, @lineBuffer[lineLength+eolLength], lineRemainder )
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' Fill the rest of the buffer with new data
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bytes := f.Read( @lineBuffer[lineRemainder], BUFFERSIZE-lineRemainder )
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' pread returns #bytes read, but after eof it returns negative numbers
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if bytes > 0
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lineRemainder += bytes
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ifnot lineRemainder
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++lineNo
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cp~
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return false
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repeat i from 0 to (lineRemainder-2) #> 0
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if lineBuffer[i] == 13 or lineBuffer[i] == 10
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eolLength := 1 ' cr or lf
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if lineBuffer[i] == 13 and lineBuffer[i+1] == 10
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++eolLength ' cr+lf
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lineBuffer[i]~ ' set terminating null
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lineLength := i
|
||
|
|
lineRemainder -= lineLength + eolLength
|
||
|
|
++lineNo ' first line of file is line 1
|
||
|
|
cp~
|
||
|
|
return true
|
||
|
|
|
||
|
|
if lineRemainder < BUFFERSIZE
|
||
|
|
lineLength := lineRemainder~
|
||
|
|
lineBuffer[lineLength]~
|
||
|
|
++lineNo
|
||
|
|
cp~
|
||
|
|
return true
|
||
|
|
|
||
|
|
abort string("Input line too long")
|
||
|
|
|
||
|
|
|
||
|
|
{{
|
||
|
|
Copyright (c) 2009 Michael Park
|
||
|
|
+------------------------------------------------------------------------------------------------------------------------------+
|
||
|
|
| TERMS OF USE: MIT License |
|
||
|
|
+------------------------------------------------------------------------------------------------------------------------------+
|
||
|
|
|Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation |
|
||
|
|
|files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, |
|
||
|
|
|modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software|
|
||
|
|
|is furnished to do so, subject to the following conditions: |
|
||
|
|
| |
|
||
|
|
|The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.|
|
||
|
|
| |
|
||
|
|
|THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE |
|
||
|
|
|WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR |
|
||
|
|
|COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
|
||
|
|
|ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
|
||
|
|
+------------------------------------------------------------------------------------------------------------------------------+
|
||
|
|
}}
|
||
|
|
|