22Implementation details for :mod:`.mathtext`.
33"""
44
5+ import copy
56from collections import namedtuple
67import enum
78import functools
@@ -1785,6 +1786,43 @@ def raise_error(s, loc, toks):
17851786return empty
17861787
17871788
1789+ class ParserState :
1790+ """
1791+ Parser state.
1792+
1793+ States are pushed and popped from a stack as necessary, and the "current"
1794+ state is always at the top of the stack.
1795+
1796+ Upon entering and leaving a group { } or math/non-math, the stack is pushed
1797+ and popped accordingly.
1798+ """
1799+
1800+ def __init__ (self ,font_output ,font ,font_class ,fontsize ,dpi ):
1801+ self .font_output = font_output
1802+ self ._font = font
1803+ self .font_class = font_class
1804+ self .fontsize = fontsize
1805+ self .dpi = dpi
1806+
1807+ def copy (self ):
1808+ return copy .copy (self )
1809+
1810+ @property
1811+ def font (self ):
1812+ return self ._font
1813+
1814+ @font .setter
1815+ def font (self ,name ):
1816+ if name in ('rm' ,'it' ,'bf' ):
1817+ self .font_class = name
1818+ self ._font = name
1819+
1820+ def get_current_underline_thickness (self ):
1821+ """Return the underline thickness for this state."""
1822+ return self .font_output .get_underline_thickness (
1823+ self .font ,self .fontsize ,self .dpi )
1824+
1825+
17881826class Parser :
17891827"""
17901828 A pyparsing-based parser for strings containing math expressions.
@@ -2130,7 +2168,7 @@ def parse(self, s, fonts_object, fontsize, dpi):
21302168 Returns the parse tree of `Node` instances.
21312169 """
21322170self ._state_stack = [
2133- self . State (fonts_object ,'default' ,'rm' ,fontsize ,dpi )]
2171+ ParserState (fonts_object ,'default' ,'rm' ,fontsize ,dpi )]
21342172self ._em_width_cache = {}
21352173try :
21362174result = self ._expression .parseString (s )
@@ -2144,47 +2182,6 @@ def parse(self, s, fonts_object, fontsize, dpi):
21442182self ._expression .resetCache ()
21452183return result [0 ]
21462184
2147- # The state of the parser is maintained in a stack. Upon
2148- # entering and leaving a group { } or math/non-math, the stack
2149- # is pushed and popped accordingly. The current state always
2150- # exists in the top element of the stack.
2151- class State :
2152- """
2153- Stores the state of the parser.
2154-
2155- States are pushed and popped from a stack as necessary, and
2156- the "current" state is always at the top of the stack.
2157- """
2158- def __init__ (self ,font_output ,font ,font_class ,fontsize ,dpi ):
2159- self .font_output = font_output
2160- self ._font = font
2161- self .font_class = font_class
2162- self .fontsize = fontsize
2163- self .dpi = dpi
2164-
2165- def copy (self ):
2166- return Parser .State (
2167- self .font_output ,
2168- self .font ,
2169- self .font_class ,
2170- self .fontsize ,
2171- self .dpi )
2172-
2173- @property
2174- def font (self ):
2175- return self ._font
2176-
2177- @font .setter
2178- def font (self ,name ):
2179- if name in ('rm' ,'it' ,'bf' ):
2180- self .font_class = name
2181- self ._font = name
2182-
2183- def get_current_underline_thickness (self ):
2184- """Return the underline thickness for this state."""
2185- return self .font_output .get_underline_thickness (
2186- self .font ,self .fontsize ,self .dpi )
2187-
21882185def get_state (self ):
21892186"""Get the current `State` of the parser."""
21902187return self ._state_stack [- 1 ]