1# Copyright 2015 Google Inc. All Rights Reserved.
2#
3# Licensed under the Apache License, Version 2.0 (the "License");
4# you may not use this file except in compliance with the License.
5# You may obtain a copy of the License at
6#
7#     http://www.apache.org/licenses/LICENSE-2.0
8#
9# Unless required by applicable law or agreed to in writing, software
10# distributed under the License is distributed on an "AS IS" BASIS,
11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12# See the License for the specific language governing permissions and
13# limitations under the License.
14
15
16import re
17from anchors import alignComponentsToAnchors
18from string import find
19
20def parseComposite(composite):
21    c = composite.split("=")
22    d = c[1].split("/")
23    glyphName = d[0]
24    if len(d) == 1:
25        offset = [0,0]
26    else:
27        offset = [int(i) for i in d[1].split(",")]
28    accentString = c[0]
29    accents = accentString.split("+")
30    baseName = accents.pop(0)
31    accentNames = [i.split(":") for i in accents ]
32    return (glyphName, baseName, accentNames, offset)
33
34
35def copyMarkAnchors(f, g, srcname, width):
36    unicode_range = set(
37        range(0x0030, 0x02B0) + range(0x1E00, 0x1EFF) +
38        [0x430, 0x435, 0x440, 0x441, 0x445, 0x455, 0x456, 0x471])
39
40    for anchor in f[srcname].anchors:
41        if "top_dd" == anchor.name:
42            g.appendAnchor(anchor.name, (anchor.x + width, anchor.y))
43        if "bottom_dd" == anchor.name:
44            g.appendAnchor(anchor.name, (anchor.x + width, anchor.y))
45        if "top0315" == anchor.name:
46            g.appendAnchor(anchor.name, (anchor.x + width, anchor.y))
47
48        if ("top" == anchor.name and
49                (g.unicode in unicode_range or
50                 g.name.endswith((".ccmp", ".smcp", ".NAV"))) and
51                not any(a.name == "parent_top" for a in g.anchors)):
52            g.appendAnchor("parent_top", anchor.position)
53
54        if ("bottom" == anchor.name and
55                (g.unicode in unicode_range or g.name.endswith(".smcp")) and
56                not any(a.name == "bottom" for a in g.anchors)):
57            g.appendAnchor("bottom", anchor.position)
58
59    if any(a.name == "top" for a in g.anchors):
60        return
61
62    anchor_parent_top = next(
63        (a for a in g.anchors if a.name == "parent_top"), None)
64    if anchor_parent_top is not None:
65        g.appendAnchor("top", anchor_parent_top.position)
66
67
68def generateGlyph(f,gname,glyphList={}):
69    glyphName, baseName, accentNames, offset = parseComposite(gname)
70
71    if baseName.find("_") != -1:
72        g = f.newGlyph(glyphName)
73        for componentName in baseName.split("_"):
74            g.appendComponent(componentName, (g.width, 0))
75            g.width += f[componentName].width
76            setUnicodeValue(g, glyphList)
77
78    else:
79        if not f.has_key(glyphName):
80            try:
81                f.compileGlyph(glyphName, baseName, accentNames)
82            except KeyError as e:
83                print ("KeyError raised for composition rule '%s', likely %s "
84                    "anchor not found in glyph '%s'" % (gname, e, baseName))
85                return
86            g = f[glyphName]
87            setUnicodeValue(g, glyphList)
88            copyMarkAnchors(f, g, baseName, offset[1] + offset[0])
89            if len(accentNames) > 0:
90                alignComponentsToAnchors(f, glyphName, baseName, accentNames)
91            if offset[0] != 0 or offset[1] != 0:
92                g.width += offset[1] + offset[0]
93                g.move((offset[0], 0), anchors=False)
94        else:
95            print ("Existing glyph '%s' found in font, ignoring composition "
96                "rule '%s'" % (glyphName, gname))
97
98
99def setUnicodeValue(glyph, glyphList):
100    """Try to ensure glyph has a unicode value -- used by FDK to make OTFs."""
101
102    if glyph.name in glyphList:
103        glyph.unicode = int(glyphList[glyph.name], 16)
104    else:
105        uvNameMatch = re.match("uni([\dA-F]{4})$", glyph.name)
106        if uvNameMatch:
107            glyph.unicode = int(uvNameMatch.group(1), 16)
108