You have already implemented a lexical analyzer in Assignment #1 and.pdfalbert20021
You have already implemented a lexical analyzer in Assignment #1 and a parser to recognize
grammatical rules in Assignment #2. In this assignment, you will be adding semantics to the
design of a small programming language to help implement blockchain. The goal of blockchain
is to allow digital information to be recorded and distributed, but not edited. In this way, a
blockchain is a foundation for immutable records of transactions that cannot be altered, deleted,
or destroyed. The semantics that you must implement in this assignment is as follows: 1. Each
time a new blockchain is created, you must extract attributes and verifies if each attribute has a
valid type. Returns false if at least one is invalid or returns true otherwise. 2. When the add
operator (keyword) is used, the data must be stored in a dictionary. 3. When errors are detected,
the parser must describe the error, including the line of the code where it occurs. 4. When
arithmetic expressions are used, the parser will implement the corresponding arithmetic
operations. For simplicity purposes, the blockchain only will store arithmetic expressions and
strings.
import ply.lex as lex
import ply.yacc as yacc
tokens = (
'ID',
'BLOCK',
'VAR',
'ADD',
'PRINT',
'VIEW',
'RUN',
'MINE',
'EXPORT',
'STRING',
'INT',
'LONG',
'FLOAT',
'LIST',
'TUPLE',
'DICT',
'NUMBER',
'ASSIGN',
'TYPEASSIGN',
'SEPARATOR',
'LPAREN',
'RPAREN',
'NE',
'LT',
'GT',
'LE',
'GE',
'PLUS',
'MINUS',
'STAR',
'SLASH',
'PCT',
'COMMENT',
'WHITESPACE'
)
t_ASSIGN = r'\='
t_TYPEASSIGN = r'\:'
t_SEPARATOR = r'\,'
t_LPAREN = r'\('
t_RPAREN = r'\)'
t_NE = r'\!='
t_LT = r'\<'
t_GT = r'\>'
t_LE = r'\<='
t_GE = r'\>='
t_PLUS = r'\+'
t_MINUS = r'\-'
t_STAR = r'\*'
t_SLASH = r'\/'
t_PCT = r'\%'
t_ignore_COMMENT = r'\#.'
t_ignore_WHITESPACE = r'\s+'
keywords = {
'BLOCK': 'KEYWORD',
'VAR': 'KEYWORD',
'ADD': 'KEYWORD',
'PRINT': 'KEYWORD',
'VIEW': 'KEYWORD',
'RUN': 'KEYWORD',
'MINE': 'KEYWORD',
'EXPORT': 'KEYWORD',
'STR':'KEYWORD',
'INT': 'KEYWORD',
'LONG': 'KEYWORD',
'FLOAT': 'KEYWORD',
'LIST': 'KEYWORD',
'TUPLE': 'KEYWORD',
'DICT':'KEYWORD',
}
tokens1 = ['ID',
'BLOCK','VAR','ADD','PRINT','VIEW','RUN','MINE','EXPORT','STRING','LONG','FLOAT','L
IST','TUPLE','DICT','NUMBER','ASSIGN','TYPEASSIGN','SEPARATOR','LPAREN','RPARE
N','NE','LT','GT','LE','GE','PLUS','MINUS','STAR','SLASH', 'PCT',
'COMMENT','WHITESPACE']\
+ list(keywords.values())
# dictionary to store values
values = {}
def t_KEYWORD(t):
r'DEF | VAR | INT | IF | ELSE'
t.type = keywords.get(t.value, 'KEYWORD')
return t
def t_ID(t):
r'[a-zA-Z_][a-zA-Z_0-9]*'
t.type = keywords.get(t.value, 'ID')
return t
def t_NUM(t):
r'[0-9]+'
t.type = keywords.get(t.value, 'INT')
return t
def t_COMMENT(t):
r'//.'
t.type = keywords.get(t.value, 'COMMENT')
pass
def t_newline(t):
r'\n+'
t.lexer.lineno += len(t.value)
def t_error(t):
print("Illegal character '%s'" % t.value[0])
t.lexer.skip(1)
def p_block(p):
"""
block : BLOCK ID ASSIGN LPAREN attributes RPAREN
| ADD ID ASSIGN LPAREN new_atts RPAREN
| PRINT I.
Pygments is a Python package to syntax hightlight over 300 programming languages and text formats. This talk gives an overview on using the pygmentize tool to render source code as HTML, RTF or latex. It then explains the basics of lexers and tokens and show how to use the pygments API to implement source code converters. Finally a step by step life coding section describes how to implement your own lexer step by step.
You have already implemented a lexical analyzer in Assignment #1 and.pdfalbert20021
You have already implemented a lexical analyzer in Assignment #1 and a parser to recognize
grammatical rules in Assignment #2. In this assignment, you will be adding semantics to the
design of a small programming language to help implement blockchain. The goal of blockchain
is to allow digital information to be recorded and distributed, but not edited. In this way, a
blockchain is a foundation for immutable records of transactions that cannot be altered, deleted,
or destroyed. The semantics that you must implement in this assignment is as follows: 1. Each
time a new blockchain is created, you must extract attributes and verifies if each attribute has a
valid type. Returns false if at least one is invalid or returns true otherwise. 2. When the add
operator (keyword) is used, the data must be stored in a dictionary. 3. When errors are detected,
the parser must describe the error, including the line of the code where it occurs. 4. When
arithmetic expressions are used, the parser will implement the corresponding arithmetic
operations. For simplicity purposes, the blockchain only will store arithmetic expressions and
strings.
import ply.lex as lex
import ply.yacc as yacc
tokens = (
'ID',
'BLOCK',
'VAR',
'ADD',
'PRINT',
'VIEW',
'RUN',
'MINE',
'EXPORT',
'STRING',
'INT',
'LONG',
'FLOAT',
'LIST',
'TUPLE',
'DICT',
'NUMBER',
'ASSIGN',
'TYPEASSIGN',
'SEPARATOR',
'LPAREN',
'RPAREN',
'NE',
'LT',
'GT',
'LE',
'GE',
'PLUS',
'MINUS',
'STAR',
'SLASH',
'PCT',
'COMMENT',
'WHITESPACE'
)
t_ASSIGN = r'\='
t_TYPEASSIGN = r'\:'
t_SEPARATOR = r'\,'
t_LPAREN = r'\('
t_RPAREN = r'\)'
t_NE = r'\!='
t_LT = r'\<'
t_GT = r'\>'
t_LE = r'\<='
t_GE = r'\>='
t_PLUS = r'\+'
t_MINUS = r'\-'
t_STAR = r'\*'
t_SLASH = r'\/'
t_PCT = r'\%'
t_ignore_COMMENT = r'\#.'
t_ignore_WHITESPACE = r'\s+'
keywords = {
'BLOCK': 'KEYWORD',
'VAR': 'KEYWORD',
'ADD': 'KEYWORD',
'PRINT': 'KEYWORD',
'VIEW': 'KEYWORD',
'RUN': 'KEYWORD',
'MINE': 'KEYWORD',
'EXPORT': 'KEYWORD',
'STR':'KEYWORD',
'INT': 'KEYWORD',
'LONG': 'KEYWORD',
'FLOAT': 'KEYWORD',
'LIST': 'KEYWORD',
'TUPLE': 'KEYWORD',
'DICT':'KEYWORD',
}
tokens1 = ['ID',
'BLOCK','VAR','ADD','PRINT','VIEW','RUN','MINE','EXPORT','STRING','LONG','FLOAT','L
IST','TUPLE','DICT','NUMBER','ASSIGN','TYPEASSIGN','SEPARATOR','LPAREN','RPARE
N','NE','LT','GT','LE','GE','PLUS','MINUS','STAR','SLASH', 'PCT',
'COMMENT','WHITESPACE']\
+ list(keywords.values())
# dictionary to store values
values = {}
def t_KEYWORD(t):
r'DEF | VAR | INT | IF | ELSE'
t.type = keywords.get(t.value, 'KEYWORD')
return t
def t_ID(t):
r'[a-zA-Z_][a-zA-Z_0-9]*'
t.type = keywords.get(t.value, 'ID')
return t
def t_NUM(t):
r'[0-9]+'
t.type = keywords.get(t.value, 'INT')
return t
def t_COMMENT(t):
r'//.'
t.type = keywords.get(t.value, 'COMMENT')
pass
def t_newline(t):
r'\n+'
t.lexer.lineno += len(t.value)
def t_error(t):
print("Illegal character '%s'" % t.value[0])
t.lexer.skip(1)
def p_block(p):
"""
block : BLOCK ID ASSIGN LPAREN attributes RPAREN
| ADD ID ASSIGN LPAREN new_atts RPAREN
| PRINT I.
Pygments is a Python package to syntax hightlight over 300 programming languages and text formats. This talk gives an overview on using the pygmentize tool to render source code as HTML, RTF or latex. It then explains the basics of lexers and tokens and show how to use the pygments API to implement source code converters. Finally a step by step life coding section describes how to implement your own lexer step by step.
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