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emscripten-core
GitHub Repository: emscripten-core/emscripten
 Path: blob/main/third_party/ply/test/lex_object.py
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# -----------------------------------------------------------------------------

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# lex_object.py

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# -----------------------------------------------------------------------------

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import sys

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if ".." not in sys.path: sys.path.insert(0,"..")

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import ply.lex as lex

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class CalcLexer:

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    tokens = (

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        'NAME','NUMBER',

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        'PLUS','MINUS','TIMES','DIVIDE','EQUALS',

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        'LPAREN','RPAREN',

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        )

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    # Tokens

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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_DIVIDE  = r'/'

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    t_EQUALS  = r'='

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    t_LPAREN  = r'\('

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    t_RPAREN  = r'\)'

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    t_NAME    = r'[a-zA-Z_][a-zA-Z0-9_]*'

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    def t_NUMBER(self,t):

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        r'\d+'

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        try:

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            t.value = int(t.value)

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        except ValueError:

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            print("Integer value too large %s" % t.value)

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            t.value = 0

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        return t

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    t_ignore = " \t"

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    def t_newline(self,t):

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        r'\n+'

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        t.lineno += t.value.count("\n")

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    def t_error(self,t):

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        print("Illegal character '%s'" % t.value[0])

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        t.lexer.skip(1)

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calc = CalcLexer()

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# Build the lexer

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lex.lex(object=calc)

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lex.runmain(data="3+4")

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