11.1.9.3.2. Parser

This module implements a parser for Spice expressions.

class PySpice.Spice.Expression.Parser.Parser

Bases: object

p_binary_operation(p)

expression : expression POWER expression | expression MULTIPLY expression | expression DIVIDE expression | expression MODULO expression | expression INT_DIVIDE expression | expression PLUS expression | expression MINUS expression | expression EQUAL expression | expression NOT_EQUAL expression | expression LESS expression | expression GREATER expression | expression LESS_EQUAL expression | expression GREATER_EQUAL expression | expression AND expression | expression OR expression

p_error(p)

p_float(p)

constant : NUMBER

p_if(p)

expression : expression IF expression COLON expression

p_statement(t)

statement : expression

p_unnary_operation(p)

expression : MINUS expression | NOT expression

p_value(p)

expression : variable | constant

p_variable(p)

variable : NAME

parse(text)

precedence = (('left', 'IF'), ('left', 'OR'), ('left', 'AND'), ('left', 'GREATER', 'LESS', 'GREATER_EQUAL', 'LESS_EQUAL', 'NOT_EQUAL', 'EQUAL'), ('left', 'MINUS', 'PLUS'), ('left', 'INT_DIVIDE', 'MODULO', 'DIVIDE', 'MULTIPLY'), ('left', 'POWER'), ('left', 'NOT'))

reserved = {}

start = 'statement'

t_AND = '&&'

t_COLON = ':'

t_DIVIDE = '/'

t_EQUAL = '=='

t_GREATER = '>'

t_GREATER_EQUAL = '>='

t_IF = '\\?'

t_INT_DIVIDE = '\\/'

t_LEFT_PARENTHESIS = '\\('

t_LESS = '<'

t_LESS_EQUAL = '<='

t_MINUS = '-'

t_MODULO = '%'

t_MULTIPLY = '\\*'

t_NAME(t)

[a-zA-Z_][a-zA-Z_0-9]*

t_NOT = '!'

t_NOT_EQUAL = '!='

t_NUMBER(t)

d+.d+(e(+|-)?(d+))? | d+.(e(+|-)?(d+))? | .d+(e(+|-)?(d+))? | d+

t_OR = '\\|\\|'

t_PLUS = '\\+'

t_POWER = '\\*\\*'

t_RIGHT_PARENTHESIS = '\\)'

t_SEMICOLON = ';'

t_SET = '='

t_error(token)

t_ignore = ' \t'

t_ignore_COMMENT = '\\#[^\\n]*'

t_newline(t)

r?n+

test_lexer(text)

tokens = ['NAME', 'NUMBER', 'SEMICOLON', 'LEFT_PARENTHESIS', 'RIGHT_PARENTHESIS', 'SET', 'NOT', 'POWER', 'MULTIPLY', 'DIVIDE', 'INT_DIVIDE', 'MODULO', 'PLUS', 'MINUS', 'EQUAL', 'NOT_EQUAL', 'LESS', 'GREATER', 'LESS_EQUAL', 'GREATER_EQUAL', 'AND', 'OR', 'IF', 'COLON']