ba655fedbb
Sixel graphics: pure-Python decoder extracts ESC P...ESC \ sequences from the output stream, renders RGBA pixels, and encodes as PNG for inline display in the notebook. No external dependencies (no PIL, no Ghostscript). INPUT support: when gwbasic prints "? " (INPUT prompt), the kernel uses the Jupyter stdin protocol (raw_input) to request input from the user and feeds the response back to the subprocess. Pygments lexer (basic_lexer.py): GW-BASIC syntax highlighting with line numbers, keywords, builtins, string/number literals, and comments. Registered as a Pygments entry point and referenced in kernel language_info. Test suite expanded from 10 to 14 tests (Sixel decode, PNG encode, inline graphics integration, lexer tokenization).
80 lines
2.8 KiB
Python
80 lines
2.8 KiB
Python
"""Pygments lexer for GW-BASIC."""
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from pygments.lexer import RegexLexer
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from pygments.token import (
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Comment, Keyword, Name, Number, Operator, Punctuation, String, Text,
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)
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class GWBasicLexer(RegexLexer):
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name = 'GW-BASIC'
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aliases = ['gwbasic', 'basic']
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filenames = ['*.bas', '*.BAS']
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mimetypes = ['text/x-basic']
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tokens = {
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'root': [
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# REM comments (to end of line)
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(r"(?i)\bREM\b.*$", Comment.Single),
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# Single-quote comments
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(r"'.*$", Comment.Single),
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# String literals
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(r'"[^"]*"', String.Double),
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# Line numbers at start of line
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(r'^\s*\d+', Name.Label),
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# Hex and octal literals
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(r'&[Hh][0-9A-Fa-f]+', Number.Hex),
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(r'&[Oo]?[0-7]+', Number.Oct),
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# Floating point
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(r'\d+\.\d*([eEdD][+-]?\d+)?[!#]?', Number.Float),
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(r'\d+[eEdD][+-]?\d+[!#]?', Number.Float),
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# Integer
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(r'\d+[%!#]?', Number.Integer),
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# Statements / keywords
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(r'(?i)\b(AUTO|BEEP|BLOAD|BSAVE|CALL|CALLS|CHAIN|CHDIR|CIRCLE'
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r'|CLEAR|CLOSE|CLS|COLOR|COM|COMMON|CONT|DATA|DEF\s+SEG'
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r'|DEF\s+FN|DEFDBL|DEFINT|DEFSNG|DEFSTR|DELETE|DIM|DRAW'
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r'|EDIT|ELSE|END|ENVIRON|ERASE|ERROR|FIELD|FILES|FOR|GET'
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r'|GOSUB|GOTO|IF|INPUT|KEY|KILL|LCOPY|LET|LINE\s+INPUT'
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r'|LINE|LIST|LLIST|LOAD|LOCATE|LPRINT|LSET|MERGE|MKDIR'
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r'|MOTOR|NAME|NEW|NEXT|ON|OPEN|OPTION\s+BASE|OUT|PAINT'
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r'|PALETTE|PLAY|POKE|PRESET|PRINT|PSET|PUT|RANDOMIZE'
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r'|READ|REM|RENUM|RESET|RESTORE|RESUME|RETURN|RMDIR|RSET'
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r'|RUN|SAVE|SCREEN|SHELL|SOUND|STOP|SWAP|SYSTEM|THEN|TIMER'
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r'|TO|TRON|TROFF|USING|VIEW|WAIT|WEND|WHILE|WIDTH|WINDOW'
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r'|WRITE)\b', Keyword),
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# Built-in functions
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(r'(?i)\b(ABS|ASC|ATN|CDBL|CHR\$|CINT|COS|CSNG|CSRLIN'
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r'|CVD|CVI|CVS|DATE\$|EOF|ENVIRON\$|ERDEV\$?|ERL|ERR'
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r'|EXP|FIX|FN|FRE|HEX\$|INKEY\$|INP|INPUT\$|INSTR|INT'
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r'|IOCTL\$|LEFT\$|LEN|LOC|LOF|LOG|LPOS|MID\$|MKD\$'
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r'|MKI\$|MKS\$|OCT\$|PEEK|PEN|PMAP|POINT|POS|RIGHT\$'
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r'|RND|SGN|SIN|SPACE\$|SPC|SQR|STICK|STR\$|STRIG'
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r'|STRING\$|TAB|TAN|TIME\$|TIMER|USR|VAL|VARPTR\$?)\b',
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Name.Builtin),
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# Logical / arithmetic operators as keywords
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(r'(?i)\b(AND|EQV|IMP|MOD|NOT|OR|XOR|STEP)\b', Operator.Word),
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# Operators
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(r'[+\-*/\\^<>=]', Operator),
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(r'<>|<=|>=', Operator),
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# Punctuation
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(r'[(),;:#]', Punctuation),
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# Identifiers (variable names)
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(r'[A-Za-z][A-Za-z0-9]*[%!#$]?', Name),
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# Whitespace
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(r'\s+', Text),
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],
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}
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