22Implementation details for :mod:`.mathtext`.
33"""
44
5+ import copy
56from collections import namedtuple
67import enum
78import functools
@@ -1777,6 +1778,43 @@ def raise_error(s, loc, toks):
17771778return empty
17781779
17791780
1781+ class ParserState :
1782+ """
1783+ Parser state.
1784+
1785+ States are pushed and popped from a stack as necessary, and the "current"
1786+ state is always at the top of the stack.
1787+
1788+ Upon entering and leaving a group { } or math/non-math, the stack is pushed
1789+ and popped accordingly.
1790+ """
1791+
1792+ def __init__ (self ,font_output ,font ,font_class ,fontsize ,dpi ):
1793+ self .font_output = font_output
1794+ self ._font = font
1795+ self .font_class = font_class
1796+ self .fontsize = fontsize
1797+ self .dpi = dpi
1798+
1799+ def copy (self ):
1800+ return copy .copy (self )
1801+
1802+ @property
1803+ def font (self ):
1804+ return self ._font
1805+
1806+ @font .setter
1807+ def font (self ,name ):
1808+ if name in ('rm' ,'it' ,'bf' ):
1809+ self .font_class = name
1810+ self ._font = name
1811+
1812+ def get_current_underline_thickness (self ):
1813+ """Return the underline thickness for this state."""
1814+ return self .font_output .get_underline_thickness (
1815+ self .font ,self .fontsize ,self .dpi )
1816+
1817+
17801818class Parser :
17811819"""
17821820 A pyparsing-based parser for strings containing math expressions.
@@ -2122,7 +2160,7 @@ def parse(self, s, fonts_object, fontsize, dpi):
21222160 Returns the parse tree of `Node` instances.
21232161 """
21242162self ._state_stack = [
2125- self . State (fonts_object ,'default' ,'rm' ,fontsize ,dpi )]
2163+ ParserState (fonts_object ,'default' ,'rm' ,fontsize ,dpi )]
21262164self ._em_width_cache = {}
21272165try :
21282166result = self ._expression .parseString (s )
@@ -2136,47 +2174,6 @@ def parse(self, s, fonts_object, fontsize, dpi):
21362174self ._expression .resetCache ()
21372175return result [0 ]
21382176
2139- # The state of the parser is maintained in a stack. Upon
2140- # entering and leaving a group { } or math/non-math, the stack
2141- # is pushed and popped accordingly. The current state always
2142- # exists in the top element of the stack.
2143- class State :
2144- """
2145- Stores the state of the parser.
2146-
2147- States are pushed and popped from a stack as necessary, and
2148- the "current" state is always at the top of the stack.
2149- """
2150- def __init__ (self ,font_output ,font ,font_class ,fontsize ,dpi ):
2151- self .font_output = font_output
2152- self ._font = font
2153- self .font_class = font_class
2154- self .fontsize = fontsize
2155- self .dpi = dpi
2156-
2157- def copy (self ):
2158- return Parser .State (
2159- self .font_output ,
2160- self .font ,
2161- self .font_class ,
2162- self .fontsize ,
2163- self .dpi )
2164-
2165- @property
2166- def font (self ):
2167- return self ._font
2168-
2169- @font .setter
2170- def font (self ,name ):
2171- if name in ('rm' ,'it' ,'bf' ):
2172- self .font_class = name
2173- self ._font = name
2174-
2175- def get_current_underline_thickness (self ):
2176- """Return the underline thickness for this state."""
2177- return self .font_output .get_underline_thickness (
2178- self .font ,self .fontsize ,self .dpi )
2179-
21802177def get_state (self ):
21812178"""Get the current `State` of the parser."""
21822179return self ._state_stack [- 1 ]