diff options
Diffstat (limited to 'systems/tex-extensions/clasen/math/math.ch')
-rw-r--r-- | systems/tex-extensions/clasen/math/math.ch | 683 |
1 files changed, 683 insertions, 0 deletions
diff --git a/systems/tex-extensions/clasen/math/math.ch b/systems/tex-extensions/clasen/math/math.ch new file mode 100644 index 0000000000..2fbe62230e --- /dev/null +++ b/systems/tex-extensions/clasen/math/math.ch @@ -0,0 +1,683 @@ +@x +@d normal=0 {the most common case when several cases are named} +@y +@d normal=0 {the most common case when several cases are named} +@d under_accent=2 {|subtype| of under math accents} +@d nesting=1 {add this to an accent |subtype| to make it nesting} +@z + +@x +primitive("mathaccent",math_accent,0);@/ +@!@:math_accent_}{\.{\\mathaccent} primitive@> +@y +primitive("mathaccent",math_accent,normal);@/ +@!@:math_accent_}{\.{\\mathaccent} primitive@> +primitive("nestingmathaccent",math_accent,normal+nesting);@/ +@!@:nesting_math_accent_}{\.{\\nestingmathaccent} primitive@> +primitive("mathunderaccent",math_accent,under_accent);@/ +@!@:math_under_accent_}{\.{\\mathunderaccent} primitive@> +primitive("nestingmathunderaccent",math_accent,under_accent+nesting);@/ +@!@:nesting_math_under_accent_}{\.{\\nestingmathunderaccent} primitive@> +@z + +@x +primitive("radical",radical,0);@/ +@!@:radical_}{\.{\\radical} primitive@> +@y +primitive("radical",radical,0);@/ +@!@:radical_}{\.{\\radical} primitive@> +primitive("genradical",radical,1);@/ +@!@:genradical_}{\.{\\genradical} primitive@> +@z + +@x +math_accent: print_esc("mathaccent"); +@y +math_accent: case chr_code of + normal: print_esc("mathaccent"); + normal+nesting: print_esc("nestingmathaccent"); + under_accent: print_esc("mathunderaccent"); + under_accent+nesting:print_esc("nestingmathunderaccent"); + othercases print("Unknown accent!") +endcases; +@z + +@x +radical: print_esc("radical"); +@y +radical: if chr_code=0 then print_esc("radical") else print_esc("genradical"); +@z + +@x +@d input_line_no_code=glue_val+1 {code for \.{\\inputlineno}} +@d badness_code=glue_val+2 {code for \.{\\badness}} +@y +@d input_line_no_code=glue_val+1 {code for \.{\\inputlineno}} +@d badness_code=glue_val+2 {code for \.{\\badness}} +@d math_style_code=glue_val+3 {code for \.{\\mathstyle}} +@z + +@x +primitive("badness",last_item,badness_code); +@!@:badness_}{\.{\\badness} primitive@> +@y +primitive("badness",last_item,badness_code); +@!@:badness_}{\.{\\badness} primitive@> +primitive("mathstyle",last_item,math_style_code); +@!@:mathstyle_}{\.{\\mathstyle} primitive@> +@z + +@x + input_line_no_code: print_esc("inputlineno"); + othercases print_esc("badness") +@y + input_line_no_code: print_esc("inputlineno"); + badness_code: print_esc("badness"); + math_style_code: print_esc("mathstyle"); + othercases confusion("last_item") +@:this can't happen last_item}{\quad last_item@> +@z + +@x +if cur_chr>glue_val then + begin if cur_chr=input_line_no_code then cur_val:=line + else cur_val:=last_badness; {|cur_chr=badness_code|} + cur_val_level:=int_val; + end +@y +if cur_chr>glue_val then + begin if cur_chr=input_line_no_code then cur_val:=line + else if cur_chr=math_style_code then begin + if abs(mode)=mmode then cur_val:=mathstyle + else cur_val:=-1; + end else cur_val:=last_badness; + cur_val_level:=int_val; + end +@z + +@x +@d radical_noad_size=5 {number of |mem| words in a radical noad} +@y +@d radical_noad_size=6 {number of |mem| words in a radical noad} +@d is_null_delimiter(#) == + ((mem[#].qqqq.b0=0) and (mem[#].qqqq.b1=min_quarterword) and + (mem[#].qqqq.b2=0) and (mem[#].qqqq.b3=min_quarterword)) +@z + +@x +begin case c div 2 of +0: print_esc("displaystyle"); {|display_style=0|} +1: print_esc("textstyle"); {|text_style=2|} +2: print_esc("scriptstyle"); {|script_style=4|} +3: print_esc("scriptscriptstyle"); {|script_script_style=6|} +othercases print("Unknown style!") +@y +begin case c of +display_style: print_esc("displaystyle"); +display_style+cramped: print_esc("crampeddisplaystyle"); +text_style: print_esc("textstyle"); +text_style+cramped: print_esc("crampedtextstyle"); +script_style: print_esc("scriptstyle"); +script_style+cramped: print_esc("crampedscriptstyle"); +script_script_style: print_esc("scriptscriptstyle"); +script_script_style+cramped: print_esc("crampedscriptscriptstyle"); +othercases print("Unknown style!") +@z + +@x +radical_noad: begin print_esc("radical"); print_delimiter(left_delimiter(p)); + end; +@y +radical_noad: if subtype(p)=normal then begin + print_esc("radical"); print_delimiter(left_delimiter(p)); + end else begin + print_esc("genradical"); print_delimiter(left_delimiter(p)); + print_delimiter(right_delimiter(p)); + end; +@z + +@x +@!cur_style:small_number; {style code at current place in the list} +@y +@!cur_style,mathstyle:small_number; {style code at current place in the list} +@z + +@x +accent_noad: make_math_accent(q); +@y +accent_noad: if subtype(q)<under_accent then make_math_accent(q) + else make_math_under_accent(q); +@z + +@x +procedure make_radical(@!q:pointer); +var x,@!y:pointer; {temporary registers for box construction} +@!delta,@!clr:scaled; {dimensions involved in the calculation} +begin x:=clean_box(nucleus(q),cramped_style(cur_style)); +if cur_style<text_style then {display style} + clr:=default_rule_thickness+(abs(math_x_height(cur_size)) div 4) +else begin clr:=default_rule_thickness; clr:=clr + (abs(clr) div 4); + end; +y:=var_delimiter(left_delimiter(q),cur_size,height(x)+depth(x)+clr+ + default_rule_thickness); +delta:=depth(y)-(height(x)+depth(x)+clr); +if delta>0 then clr:=clr+half(delta); {increase the actual clearance} +shift_amount(y):=-(height(x)+clr); +link(y):=overbar(x,clr,height(y)); +info(nucleus(q)):=hpack(y,natural); math_type(nucleus(q)):=sub_box; +end; +@y +procedure make_radical(@!q:pointer); +var x,@!y,z:pointer; {temporary registers for box construction} +@!delta,@!clr,ht:scaled; {dimensions involved in the calculation} +begin x:=clean_box(nucleus(q),cramped_style(cur_style)); +if cur_style<text_style then {display style} + clr:=default_rule_thickness+(abs(math_x_height(cur_size)) div 4) +else begin clr:=default_rule_thickness; clr:=clr + (abs(clr) div 4); + end; +y:=var_delimiter(left_delimiter(q),cur_size,height(x)+depth(x)+clr+ + default_rule_thickness); +delta:=depth(y)-(height(x)+depth(x)+clr); +if delta>0 then clr:=clr+half(delta); {increase the actual clearance} +shift_amount(y):=-(height(x)+clr); +ht:=height(y); +if subtype(q)=normal then link(y):=overbar(x,clr,ht) +else begin + z:=var_delimiter(right_delimiter(q),cur_size,height(x)+depth(x)+clr+ + default_rule_thickness); + shift_amount(z):=-(height(x)+clr); + if height(z)>ht then ht:=height(z); + link(y):=overbar(x,clr,ht); + link(link(y)):=z; +end; +info(nucleus(q)):=hpack(y,natural); math_type(nucleus(q)):=sub_box; +end; +@z + +@x +procedure make_math_accent(@!q:pointer); +label done,done1; +var p,@!x,@!y:pointer; {temporary registers for box construction} +@y +procedure horizontally_stack_into_box(@!b:pointer;@!f:internal_font_number;@!c:quarterword); +var p:pointer; {new node placed into |b|} +begin + p:=char_box(f,c); link(p):=list_ptr(b); list_ptr(b):=p; + width(b):=width(b)+width(p); +end; + +procedure make_math_under_accent(@!q:pointer); +label done,done1,done2,done3; +var p,qq,@!x,@!y:pointer; {temporary registers for box construction} +@!a:integer; {address of lig/kern instruction} +@!c:quarterword; {accent character} +@!f:internal_font_number; {its font} +@!i,ii:four_quarters; {its |char_info|} +@!s:scaled; {amount to skew the accent to the right} +@!h:scaled; {height of character being accented} +@!delta,sep:scaled; {space to insert between accentee and accent} +@!w,v,u:scaled; {width of the accentee, not including sub/superscripts} +@!t:four_quarters; +@!m,n:integer; +@!hd:eight_bits; +begin fetch(accent_chr(q)); +if char_exists(cur_i) then + begin i:=cur_i; c:=cur_c; f:=cur_f;@/ + @<Compute under accent skew@>; + @<Compute separation for under accent@>; + x:=clean_box(nucleus(q),cur_style); w:=width(x); h:=height(x); + @<Switch to a larger accent if available and appropriate@>; + if (math_type(supscr(q))<>empty)or(math_type(subscr(q))<>empty) then + if math_type(nucleus(q))=math_char then + @<Swap the subscript and superscript into box |x|@>; + shift_amount(y):=half(w-width(y))-s; width(y):=0; + p:=new_kern(sep); link(x):=p; link(p):=y; + p:=new_kern(-sep-x_height(f)); link(y):=p; + y:=vpack(x,natural); width(y):=w; + depth(y):=depth(y)+height(y)-h; height(y):=h; + info(nucleus(q)):=y; math_type(nucleus(q)):=sub_box; + end; +end; + +procedure make_math_accent(@!q:pointer); +label done,done1,done2; +var p,qq,@!x,@!y:pointer; {temporary registers for box construction} +@z + +@x +@!w:scaled; {width of the accentee, not including sub/superscripts} +@y +@!w,v,u:scaled; {width of the accentee, not including sub/superscripts} +@!t:four_quarters; +@!m,n:integer; +@!hd:eight_bits; +@z + +@x + y:=char_box(f,c); +@y +@z + +@x +@ @<Switch to a larger accent if available and appropriate@>= +loop@+ begin if char_tag(i)<>list_tag then goto done; + y:=rem_byte(i); + i:=char_info(f)(y); + if not char_exists(i) then goto done; + if char_width(f)(i)>w then goto done; + c:=y; + end; +done: +@y +@ @<Switch to a larger accent if available and appropriate@>= +loop@+ begin + if char_tag(i)=ext_tag then begin + y:=new_null_box; + type(y):=hlist_node; + i:=font_info[exten_base[f]+rem_byte(i)].qqqq;@/ + c:=ext_rep(i); t:=char_info(f)(c); u:=char_width(f)(t); v:=0; + hd:=height_depth(t); height(y):=char_height(f)(hd); depth(y):=char_depth(f)(hd); + c:=ext_bot(i); t:=char_info(f)(c); @+if c<>min_quarterword then v:=v+char_width(f)(t); + c:=ext_mid(i); t:=char_info(f)(c); @+if c<>min_quarterword then v:=v+char_width(f)(t); + c:=ext_top(i); t:=char_info(f)(c); @+if c<>min_quarterword then v:=v+char_width(f)(t); + n:=0; + if u>0 then while v<w do begin + v:=v+u; incr(n); + if ext_mid(i)<>min_quarterword then v:=v+u; + end; + c:=ext_bot(i); + if c<>min_quarterword then horizontally_stack_into_box(y,f,c); + c:=ext_rep(i); + for m:=1 to n do horizontally_stack_into_box(y,f,c); + c:=ext_mid(i); + if c<>min_quarterword then begin + horizontally_stack_into_box(y,f,c); + c:=ext_rep(i); + for m:=1 to n do horizontally_stack_into_box(y,f,c); + end; + c:=ext_top(i); + if c<>min_quarterword then horizontally_stack_into_box(y,f,c); + goto done2; + end; + if char_tag(i)<>list_tag then goto done; + y:=rem_byte(i); + i:=char_info(f)(y); + if not char_exists(i) then goto done; + if char_width(f)(i)>w then goto done; + c:=y; +end; +done: + y:=char_box(f,c); +done2: +@z + +@x +@ @<Compute the amount of skew@>= +s:=0; +if math_type(nucleus(q))=math_char then + begin fetch(nucleus(q)); +@y +@ @<Compute under accent skew@>= +s:=0; +qq:=q; +if odd(subtype(q)) then + while (math_type(nucleus(qq))=sub_mlist)and + (type(info(nucleus(qq)))=accent_noad)and + ((subtype(qq)=subtype(q))or(subtype(qq) div 2<>subtype(q) div 2)) do + qq:=info(nucleus(qq)); +if math_type(nucleus(qq))=math_char then + begin fetch(nucleus(qq)); + ii:=char_info(cur_f)(skew_char[cur_f]); + if char_tag(ii)=lig_tag then + begin a:=lig_kern_start(cur_f)(ii); + ii:=font_info[a].qqqq; + if skip_byte(ii)>stop_flag then + begin a:=lig_kern_restart(cur_f)(ii); + ii:=font_info[a].qqqq; + end; + loop@+ begin if qo(next_char(ii))=cur_c then + begin if op_byte(ii)>=kern_flag then + if skip_byte(ii)<=stop_flag then s:=char_kern(cur_f)(ii); + goto done1; + end; + if skip_byte(ii)>=stop_flag then goto done1; + a:=a+qo(skip_byte(ii))+1; + ii:=font_info[a].qqqq; + end; + end; + end; +done1: + +@ @<Compute separation for under accent@>= + sep:=0; + ii:=i; + if char_tag(ii)=lig_tag then + begin a:=lig_kern_start(f)(ii); + ii:=font_info[a].qqqq; + if skip_byte(ii)>stop_flag then + begin a:=lig_kern_restart(f)(ii); + ii:=font_info[a].qqqq; + end; + loop@+ begin if qo(next_char(ii))=c then + begin if op_byte(ii)>=kern_flag then + if skip_byte(ii)<=stop_flag then sep:=char_kern(f)(ii); + goto done3; + end; + if skip_byte(ii)>=stop_flag then goto done3; + a:=a+qo(skip_byte(ii))+1; + ii:=font_info[a].qqqq; + end; + end; +done3: + +@ @<Compute the amount of skew@>= +s:=0; +qq:=q; +{while odd(subtype(qq))and(math_type(nucleus(qq))=sub_mlist)and + (type(info(nucleus(qq)))=accent_noad) do} +if odd(subtype(q)) then + while (math_type(nucleus(qq))=sub_mlist)and + (type(info(nucleus(qq)))=accent_noad)and + ((subtype(qq)=subtype(q))or(subtype(qq) div 2<>subtype(q) div 2)) do + qq:=info(nucleus(qq)); +if math_type(nucleus(qq))=math_char then + begin fetch(nucleus(qq)); +@z + +@x +begin push_math(math_shift_group); eq_word_define(int_base+cur_fam_code,-1); +if every_math<>null then begin_token_list(every_math,every_math_text); +@y +begin mathstyle:=text_style; +push_math(math_shift_group); eq_word_define(int_base+cur_fam_code,-1); +if every_math<>null then begin_token_list(every_math,every_math_text); +@z + +@x +push_math(math_shift_group); mode:=mmode; +eq_word_define(int_base+cur_fam_code,-1);@/ +@y +mathstyle:=display_style; +push_math(math_shift_group); mode:=mmode; +eq_word_define(int_base+cur_fam_code,-1);@/ +@z + +@x +mmode+left_brace: begin tail_append(new_noad); + back_input; scan_math(nucleus(tail)); +@y +mmode+left_brace: begin tail_append(new_noad); + back_input; scan_math(nucleus(tail),mathstyle); +@z + +@x +procedure scan_math(@!p:pointer); +label restart,reswitch,exit; +var c:integer; {math character code} +begin restart:@<Get the next non-blank non-relax...@>; +reswitch:case cur_cmd of +letter,other_char,char_given: begin c:=ho(math_code(cur_chr)); + if c=@'100000 then + begin @<Treat |cur_chr| as an active character@>; + goto restart; + end; + end; +char_num: begin scan_char_num; cur_chr:=cur_val; cur_cmd:=char_given; + goto reswitch; + end; +math_char_num: begin scan_fifteen_bit_int; c:=cur_val; + end; +math_given: c:=cur_chr; +delim_num: begin scan_twenty_seven_bit_int; c:=cur_val div @'10000; + end; +othercases @<Scan a subformula enclosed in braces and |return|@> +endcases;@/ +math_type(p):=math_char; character(p):=qi(c mod 256); +if (c>=var_code)and fam_in_range then fam(p):=cur_fam +else fam(p):=(c div 256) mod 16; +exit:end; +@y +procedure scan_math(@!p:pointer;s:small_number); +label restart,reswitch,exit; +var c:integer; {math character code} + savedstyle:small_number; +begin +savedstyle:=mathstyle; mathstyle:=s; +restart:@<Get the next non-blank non-relax...@>; +reswitch:case cur_cmd of +letter,other_char,char_given: begin c:=ho(math_code(cur_chr)); + if c=@'100000 then + begin @<Treat |cur_chr| as an active character@>; + goto restart; + end; + end; +char_num: begin scan_char_num; cur_chr:=cur_val; cur_cmd:=char_given; + goto reswitch; + end; +math_char_num: begin scan_fifteen_bit_int; c:=cur_val; + end; +math_given: c:=cur_chr; +delim_num: begin scan_twenty_seven_bit_int; c:=cur_val div @'10000; + end; +othercases @<Scan a subformula enclosed in braces and |return|@> +endcases;@/ +math_type(p):=math_char; character(p):=qi(c mod 256); +if (c>=var_code)and fam_in_range then fam(p):=cur_fam +else fam(p):=(c div 256) mod 16; +mathstyle:=savedstyle; +exit: +end; +@z + +@x +begin back_input; scan_left_brace;@/ +saved(0):=p; incr(save_ptr); push_math(math_group); return; +@y +begin back_input; scan_left_brace;@/ +saved(0):=p; incr(save_ptr); saved(0):=savedstyle; incr(save_ptr); +push_math(math_group); return; +@z + +@x +mmode+math_comp: begin tail_append(new_noad); + type(tail):=cur_chr; scan_math(nucleus(tail)); +@y +mmode+math_comp: begin tail_append(new_noad); + type(tail):=cur_chr; + case type(tail) of + over_noad: scan_math(nucleus(tail),cramped_style(mathstyle)); + othercases scan_math(nucleus(tail),mathstyle); + endcases; +@z + +@x +type(tail):=radical_noad; subtype(tail):=normal; +@y +type(tail):=radical_noad; subtype(tail):=cur_chr; +@z + +@x +{before |scan_math| in |math_radical|} +scan_math(nucleus(tail)); +@y +if subtype(tail)=normal then mem[right_delimiter(tail)].qqqq:=null_delimiter +else scan_delimiter(right_delimiter(tail),true); +{before |scan_math| in |math_radical|} +scan_math(nucleus(tail),cramped_style(mathstyle)); +@z + +@x +procedure math_ac; +begin if cur_cmd=accent then + @<Complain that the user should have said \.{\\mathaccent}@>; +tail_append(get_node(accent_noad_size)); +type(tail):=accent_noad; subtype(tail):=normal; +@y +procedure math_ac; +begin if cur_cmd=accent then + @<Complain that the user should have said \.{\\mathaccent}@>; +tail_append(get_node(accent_noad_size)); +type(tail):=accent_noad; subtype(tail):=cur_chr; +@z + +@x +if (cur_val>=var_code)and fam_in_range then fam(accent_chr(tail)):=cur_fam +else fam(accent_chr(tail)):=(cur_val div 256) mod 16; +scan_math(nucleus(tail)); +end; +@y +if (cur_val>=var_code)and fam_in_range then fam(accent_chr(tail)):=cur_fam +else fam(accent_chr(tail)):=(cur_val div 256) mod 16; +scan_math(nucleus(tail),cramped_style(mathstyle)); +end; +@z + +@x +primitive("displaystyle",math_style,display_style); +@!@:display_style_}{\.{\\displaystyle} primitive@> +primitive("textstyle",math_style,text_style); +@!@:text_style_}{\.{\\textstyle} primitive@> +primitive("scriptstyle",math_style,script_style); +@!@:script_style_}{\.{\\scriptstyle} primitive@> +primitive("scriptscriptstyle",math_style,script_script_style); +@!@:script_script_style_}{\.{\\scriptscriptstyle} primitive@> +@y +primitive("displaystyle",math_style,display_style); +@!@:display_style_}{\.{\\displaystyle} primitive@> +primitive("crampeddisplaystyle",math_style,display_style+cramped); +@!@:cramped_display_style_}{\.{\\crampeddisplaystyle} primitive@> +primitive("textstyle",math_style,text_style); +@!@:text_style_}{\.{\\textstyle} primitive@> +primitive("crampedtextstyle",math_style,text_style+cramped); +@!@:cramped_text_style_}{\.{\\crampedtextstyle} primitive@> +primitive("scriptstyle",math_style,script_style); +@!@:script_style_}{\.{\\scriptstyle} primitive@> +primitive("crampedscriptstyle",math_style,script_style+cramped); +@!@:cramped_script_style_}{\.{\\crampedscriptstyle} primitive@> +primitive("scriptscriptstyle",math_style,script_script_style); +@!@:script_script_style_}{\.{\\scriptscriptstyle} primitive@> +primitive("crampedscriptscriptstyle",math_style,script_script_style+cramped); +@!@:cramped_script_script_style_}{\.{\\crampedscriptscriptstyle} primitive@> +@z + +@x +mmode+math_style: tail_append(new_style(cur_chr)); +@y +mmode+math_style: begin tail_append(new_style(cur_chr)); + mathstyle:=cur_chr; +end; +@z + +@x +procedure append_choices; +begin tail_append(new_choice); incr(save_ptr); saved(-1):=0; +push_math(math_choice_group); scan_left_brace; +@y +procedure append_choices; +begin tail_append(new_choice); +incr(save_ptr); saved(-1):=mathstyle; +incr(save_ptr); saved(-1):=0; +push_math(math_choice_group); scan_left_brace; +mathstyle:=display_style; +@z + +@x +3:begin script_script_mlist(tail):=p; decr(save_ptr); return; + end; +end; {there are no other cases} +incr(saved(-1)); push_math(math_choice_group); scan_left_brace; +@y +3:begin script_script_mlist(tail):=p; decr(save_ptr); + mathstyle:=saved(-1); decr(save_ptr); + return; + end; +end; {there are no other cases} +incr(saved(-1)); push_math(math_choice_group); scan_left_brace; +mathstyle:=2*saved(-1); +@z + +@x +procedure sub_sup; +var t:small_number; {type of previous sub/superscript} +@!p:pointer; {field to be filled by |scan_math|} +begin t:=empty; p:=null; +if tail<>head then if scripts_allowed(tail) then + begin p:=supscr(tail)+cur_cmd-sup_mark; {|supscr| or |subscr|} + t:=math_type(p); + end; +if (p=null)or(t<>empty) then @<Insert a dummy noad to be sub/superscripted@>; +scan_math(p); +end; +@y +procedure sub_sup; +var t:small_number; {type of previous sub/superscript} +@!p:pointer; {field to be filled by |scan_math|} +begin t:=empty; p:=null; +if tail<>head then if scripts_allowed(tail) then + begin p:=supscr(tail)+cur_cmd-sup_mark; {|supscr| or |subscr|} + t:=math_type(p); + end; +if (p=null)or(t<>empty) then @<Insert a dummy noad to be sub/superscripted@>; +if cur_cmd=sup_mark then scan_math(p,sup_style(mathstyle)) +else scan_math(p,sub_style(mathstyle)); +end; +@z + +@x +@d delimited_code=3 { `\.{\\abovewithdelims}', etc.} +@y +@d delimited_code=3 { `\.{\\abovewithdelims}', etc.} +@d fraction_code=6 { `\.{\\fraction}', etc.} +@z + +@x +primitive("atopwithdelims",above,delimited_code+atop_code); +@!@:atop_with_delims_}{\.{\\atopwithdelims} primitive@> +@y +primitive("atopwithdelims",above,delimited_code+atop_code); +@!@:atop_with_delims_}{\.{\\atopwithdelims} primitive@> +primitive("fraction",above,fraction_code); +@!@:fraction_}{\.{\\fraction} primitive@> +@z + +@x + delimited_code+atop_code:print_esc("atopwithdelims"); + othercases print_esc("above") +@y + delimited_code+atop_code:print_esc("atopwithdelims"); + fraction_code:print_esc("fraction"); + othercases print_esc("above") +@z + +@x +mmode+above: math_fraction; +@y +mmode+above: if cur_chr=fraction_code then begin + scan_left_brace; tail_append(new_noad); + back_input; + scan_math(nucleus(tail),num_style(mathstyle)); +end else begin + math_fraction; +end; +@z + +@x +procedure math_fraction; +var c:small_number; {the type of generalized fraction we are scanning} +begin c:=cur_chr; +@y +procedure math_fraction; +var c:small_number; {the type of generalized fraction we are scanning} +begin c:=cur_chr; +mathstyle:=denom_style(save_stack[cur_boundary-1].int); +@z + +@x +math_group: begin unsave; decr(save_ptr);@/ + math_type(saved(0)):=sub_mlist; p:=fin_mlist(null); info(saved(0)):=p; +@y +math_group: begin unsave; decr(save_ptr);@/ + mathstyle:=saved(0); decr(save_ptr); + math_type(saved(0)):=sub_mlist; p:=fin_mlist(null); info(saved(0)):=p; +@z + |