add the method to measure the char's metrics

example/ex1.ug

@@ -1,5 +1,5 @@
 {@lang|en}
-{@def|@font|{@quote|FreeSans|AR PL Kaiti M}}
+{@def|@font|{@quote|FreeSans|AR PL UKai TW}}
 {@def|@fontsize|12}
 therapy of communication and pronounciation123%comment
 

src/interp.jl

@@ -1,5 +1,10 @@
 module Interp
 using Match
+using Fontconfig
+
+include("pdfoperating.jl")
+using .PDFOperating
+
 u = Main.uahgi
 c = Main.uahgi.Parsing.Passes.Classes
 
@@ -25,8 +30,8 @@ function interp(ast, env, res_box, put_char=true)
         c.SEQ([c.ELE([c.ID("def")]),
             c.ELE([c.ID(id)]),val]) => 
                         begin
-                            (val_evaled, env, res_box) = interp(val, env, res_box)
-                            println("ID~~~", id, " VAL~~~", val_evaled)
+                            (val_evaled, env, res_box) = interp(val, env, res_box, false)
+                            #println("ID~~~", id, " VAL~~~", val_evaled)
                             env[id] = val_evaled
                             return (val_evaled, env, res_box)
                         end
@@ -34,7 +39,7 @@ function interp(ast, env, res_box, put_char=true)
             y...]) =>   begin
                             list = map(x -> x[1],
                                 map(x -> interp(x, env, res_box), y))
-                            println("QUOTE", list)
+                            #println("QUOTE", list)
                             return (list, env, res_box)
                         end
         
@@ -45,16 +50,41 @@ function interp(ast, env, res_box, put_char=true)
             
                         end
         c.CHAR(ch) => begin
-                        ret = ch
+                        atomic_ch = ch[1]
+                        
                         if put_char == true
+
+                            font_idx = 1
+                            font_family = string(env["font"][font_idx])
+                            font_family_length = length(font_family)
+                            while !is_in_font(atomic_ch, font_family)
+                                if font_idx <= font_family_length
+                                    font_idx += 1
+                                    font_family = string(env["font"][font_idx])
+                                else
+                                    font_list = string(env["font"])
+                                    throw("the chars $atomic_ch is not contained in all the fonts
+                                        listed in listed fonts: $font_list")
+                                end
+                            end
+
+
+                            font_path = get_font_path(font_family)
+                            font_size = parse(Int, env["fontsize"])
+                            glyph_metrics = PDFOperating.check_char_size(
+                                                atomic_ch, font_path, font_size)
+
+
                             push!(res_box.eles[end].eles,
-                                #=TODO: check single-char size
-                                env[""]
-                                =#
-                                u.ChBox(ch, "foo", 20, 1, 2, 3))
+                                u.ChBox(ch,
+                                    font_path,
+                                    font_size,
+                                    glyph_metrics.ht,
+                                    glyph_metrics.dp,
+                                    glyph_metrics.wd))
                         end
-                        return (ret, env, res_box)
-                      end
+                            return (ch, env, res_box)
+                    end
         c.NL(nl) => return (nl, env, res_box)
         c.SPACE(sp) => return (sp, env, res_box)
 
@@ -66,4 +96,54 @@ function interp(ast, env, res_box, put_char=true)
     end
 end
 
+function get_font_path(font_family)
+    ptn = Fontconfig.Pattern(family=font_family)
+    matched = Fontconfig.match(ptn)
+    path = match(r"file=([^:]+)", string(matched))[1]
+    return path
+end
+
+"""
+check if the glyph of a char is contained by `font_family`
+"""
+function is_in_font(char, font_family)
+    ptn = Fontconfig.Pattern(family=font_family)
+    matched = Fontconfig.match(ptn)
+    charset = match(r"charset=([^:]+)", string(matched))[1]
+    splitted1 = split(charset, " ")
+    splitted2 = map(x -> split(x, "-"), splitted1)
+
+    """aux function"""
+    regex_aux(x) = map(y -> padding_zero(y), x)
+
+    x1 = map(x -> regex_aux(x), splitted2)
+    x2 = map(x -> length(x) == 1 ? "\\u" * x[1] : "\\u" * x[1] * "-\\u" * x[2] , x1)
+    regex_final = "[" * reduce((x,y)-> x*""*y, x2) * "]"
+    regex_final_wrapped = Regex(regex_final)
+
+    if match(regex_final_wrapped, string(char)) !== nothing
+        return true
+    else
+        return false
+
+    end
+end
+
+"""
+padding zero for a hex-digit string `i` to make it a 4-digit.
+- "27" -> "0027"
+- "8af" -> "08af"
+"""
+function padding_zero(i)
+    if length(i) == 2
+        i="00"*i
+    end
+    if length(i)==3
+        i="0"*i
+    end
+    return i
+end
+
+
+
 end

src/pdfoperating.jl

@@ -9,14 +9,14 @@ using TeX-like metrics, in px
  - depth
 """
 struct CharMetrics
-    height::Float64
-    width::Float64
-    depth::Float64    
+    ht::Float64
+    dp::Float64  
+    wd::Float64  
 end
 
 #the default path is Noto Serif CJK Regular
-default_font_path = "src/thirdParty/fonts/noto/NotoSerifTC-Regular.ttf"
-#default_font_path = "src/thirdParty/fonts/linuxLibertine/LinLibertine_Rah.ttf"
+#default_font_path = "src/thirdParty/fonts/noto/NotoSerifTC-Regular.ttf"
+default_font_path = "src/thirdParty/fonts/linuxLibertine/LinLibertine_Rah.ttf"
 
 function createPDF()
     #=returns pdf=#
@@ -93,7 +93,7 @@ function check_char_size(char, font_path, font_size, font_index=0)
     library = Vector{FT_Library}(undef, 1)
     error = FT_Init_FreeType(library)
     face = Ref{FT_Face}()
-    FT_New_Face(library[1], font_path, font_index, face);
+    FT_New_Face(library[1], string(font_path), 0, face)
     glyph_index = FT_Get_Char_Index(face[], char)
     FT_Load_Glyph(face[], glyph_index, FT_LOAD_NO_SCALE)
     faceRec = unsafe_load(face[])
@@ -107,11 +107,8 @@ function check_char_size(char, font_path, font_size, font_index=0)
     #from baseline down to the bottom of the glyph
     depth = metricToPx(metrics.height - metrics.horiBearingY, font_size)
 
-    println("width ", width, "px")
-    println("height ", height, "px")
-    println("depth ", depth, "px")
 
-    return CharMetrics(height, width, depth)
+    return CharMetrics(height, depth, width)
 end
 
 """
@@ -121,18 +118,18 @@ function metricToPx(metric, size_pt)
     return metric * size_pt / 750
 end
 
-pdf = createPDF()
-page = addPage(pdf)
-font = load_font(pdf, default_font_path)
-put_text(page, "上下abc", font, 15, 100, 200)
-put_text(page, "天地人", font, 15, 200, 200)
+#pdf = createPDF()
+#page = addPage(pdf)
+#font = load_font(pdf, default_font_path)
+#put_text(page, "上下abc", font, 15, 100, 200)
+#put_text(page, "天地人", font, 15, 200, 200)
 
-save_pdf(pdf, "text.pdf")
+#save_pdf(pdf, "text.pdf")
 
-println("PDF generated.")
-check_char_size(
-    'j',
-    default_font_path,
-    20)
+#println("PDF generated.")
+#check_char_size(
+#    '安',
+#    default_font_path,
+#    20)
 
 end