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8be014ee46
This directory now contains third_party software that is vendored into the Servo source tree. The idea is that it would eventually hold webrender and other crates from mozilla-central as well with a standard patch management approach for each.
61 lines
1.1 KiB
Python
61 lines
1.1 KiB
Python
# An implementation of Dartmouth BASIC (1964)
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from ply import *
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keywords = (
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'LET', 'READ', 'DATA', 'PRINT', 'GOTO', 'IF', 'THEN', 'FOR', 'NEXT', 'TO', 'STEP',
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'END', 'STOP', 'DEF', 'GOSUB', 'DIM', 'REM', 'RETURN', 'RUN', 'LIST', 'NEW',
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)
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tokens = keywords + (
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'EQUALS', 'PLUS', 'MINUS', 'TIMES', 'DIVIDE', 'POWER',
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'LPAREN', 'RPAREN', 'LT', 'LE', 'GT', 'GE', 'NE',
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'COMMA', 'SEMI', 'INTEGER', 'FLOAT', 'STRING',
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'ID', 'NEWLINE'
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)
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t_ignore = ' \t'
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def t_REM(t):
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r'REM .*'
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return t
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def t_ID(t):
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r'[A-Z][A-Z0-9]*'
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if t.value in keywords:
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t.type = t.value
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return t
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t_EQUALS = r'='
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t_PLUS = r'\+'
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t_MINUS = r'-'
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t_TIMES = r'\*'
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t_POWER = r'\^'
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t_DIVIDE = r'/'
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t_LPAREN = r'\('
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t_RPAREN = r'\)'
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t_LT = r'<'
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t_LE = r'<='
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t_GT = r'>'
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t_GE = r'>='
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t_NE = r'<>'
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t_COMMA = r'\,'
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t_SEMI = r';'
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t_INTEGER = r'\d+'
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t_FLOAT = r'((\d*\.\d+)(E[\+-]?\d+)?|([1-9]\d*E[\+-]?\d+))'
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t_STRING = r'\".*?\"'
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def t_NEWLINE(t):
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r'\n'
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t.lexer.lineno += 1
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return t
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def t_error(t):
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print("Illegal character %s" % t.value[0])
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t.lexer.skip(1)
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lex.lex(debug=0)
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