summaryrefslogtreecommitdiff
path: root/tex/context/base/strc-tag.lua
blob: f853cdd8505c9b534021896b3b3e11ef0b60e2d4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
if not modules then modules = { } end modules ['strc-tag'] = {
    version   = 1.001,
    comment   = "companion to strc-tag.mkiv",
    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
    copyright = "PRAGMA ADE / ConTeXt Development Team",
    license   = "see context related readme files"
}

-- This is rather experimental code.

local insert, remove, unpack, concat = table.insert, table.remove, table.unpack, table.concat
local gsub, find, topattern, format = string.gsub, string.find, string.topattern, string.format
local lpegmatch = lpeg.match
local texattribute = tex.attribute
local allocate = utilities.storage.allocate
local settings_to_hash = utilities.parsers.settings_to_hash

local trace_tags = false  trackers.register("structures.tags", function(v) trace_tags = v end)

local report_tags = logs.new("tags")

local attributes, structures = attributes, structures

local a_tagged       = attributes.private('tagged')

local unsetvalue     = attributes.unsetvalue
local codeinjections = backends.codeinjections

local taglist    = allocate()
local properties = allocate()
local labels     = allocate()
local stack      = { }
local chain      = { }
local ids        = { }
local enabled    = false

local tags       = structures.tags
tags.taglist     = taglist -- can best be hidden
tags.labels      = labels

local properties = allocate {

    document           = { pdf = "Div",        nature = "display" },

    division           = { pdf = "Div",        nature = "display" },
    paragraph          = { pdf = "P",          nature = "mixed"   },
    construct          = { pdf = "Span",       nature = "inline"  },

    section            = { pdf = "Sect",       nature = "display" },
    sectiontitle       = { pdf = "H",          nature = "mixed"   },
    sectionnumber      = { pdf = "H",          nature = "mixed"   },
    sectioncontent     = { pdf = "Div",        nature = "display" },

    itemgroup          = { pdf = "L",          nature = "display" },
    item               = { pdf = "Li",         nature = "display" },
    itemtag            = { pdf = "Lbl",        nature = "mixed"   },
    itemcontent        = { pdf = "LBody",      nature = "mixed"   },

    description        = { pdf = "Div",        nature = "display" },
    descriptiontag     = { pdf = "Div",        nature = "mixed"   },
    descriptioncontent = { pdf = "Div",        nature = "mixed"   },
    descriptionsymbol  = { pdf = "Span",       nature = "inline"  }, -- note reference

    verbatimblock      = { pdf = "Code",       nature = "display" },
    verbatimline       = { pdf = "Code",       nature = "display" },
    verbatim           = { pdf = "Code",       nature = "inline"  },

    register           = { pdf = "Div",        nature = "display" },
    registersection    = { pdf = "Div",        nature = "display" },
    registertag        = { pdf = "Span",       nature = "mixed"   },
    registerentries    = { pdf = "Div",        nature = "display" },
    registerentry      = { pdf = "Span",       nature = "mixed"   },
    registersee        = { pdf = "Span",       nature = "mixed"   },
    registerpages      = { pdf = "Span",       nature = "mixed"   },
    registerpage       = { pdf = "Span",       nature = "inline"  },
    registerpagerange  = { pdf = "Span",       nature = "mixed"   },

    table              = { pdf = "Table",      nature = "display" },
    tablerow           = { pdf = "TR",         nature = "display" },
    tablecell          = { pdf = "TD",         nature = "mixed"   },
    tabulate           = { pdf = "Table",      nature = "display" },
    tabulaterow        = { pdf = "TR",         nature = "display" },
    tabulatecell       = { pdf = "TD",         nature = "mixed"   },

    list               = { pdf = "TOC",        nature = "display" },
    listitem           = { pdf = "TOCI",       nature = "display" },
    listtag            = { pdf = "Lbl",        nature = "mixed"   },
    listcontent        = { pdf = "P",          nature = "mixed"   },
    listdata           = { pdf = "P",          nature = "mixed"   },
    listpage           = { pdf = "Reference",  nature = "mixed"   },

    delimitedblock     = { pdf = "BlockQuote", nature = "display" },
    delimited          = { pdf = "Quote",      nature = "inline"  },
    subsentence        = { pdf = "Span",       nature = "inline"  },

    float              = { pdf = "Div",        nature = "display" }, -- Figure
    floatcaption       = { pdf = "Caption",    nature = "display" },
    floattag           = { pdf = "Span",       nature = "mixed"   },
    floattext          = { pdf = "Span",       nature = "mixed"   },
    floatcontent       = { pdf = "P",          nature = "mixed"   },

    image              = { pdf = "P",          nature = "mixed"   },
    mpgraphic          = { pdf = "P",          nature = "mixed"   },

    formulaset         = { pdf = "Div",        nature = "display" },
    formula            = { pdf = "Div",        nature = "display" }, -- Formula
    formulatag         = { pdf = "Span",       nature = "mixed"   },
    formulacontent     = { pdf = "P",          nature = "display" },
    subformula         = { pdf = "Div",        nature = "display" },

    link               = { pdf = "Link",       nature = "inline"  },

    margintextblock    = { pdf = "Span",       nature = "inline"  },
    margintext         = { pdf = "Span",       nature = "inline"  },

    math               = { pdf = "Div",        nature = "display" },
    mn                 = { pdf = "Span",       nature = "mixed"   },
    mi                 = { pdf = "Span",       nature = "mixed"   },
    mo                 = { pdf = "Span",       nature = "mixed"   },
    ms                 = { pdf = "Span",       nature = "mixed"   },
    mrow               = { pdf = "Span",       nature = "display" },
    msubsup            = { pdf = "Span",       nature = "display" },
    msub               = { pdf = "Span",       nature = "display" },
    msup               = { pdf = "Span",       nature = "display" },
    merror             = { pdf = "Span",       nature = "mixed"   },
    munderover         = { pdf = "Span",       nature = "display" },
    munder             = { pdf = "Span",       nature = "display" },
    mover              = { pdf = "Span",       nature = "display" },
    mtext              = { pdf = "Span",       nature = "mixed"   },
    mfrac              = { pdf = "Span",       nature = "display" },
    mroot              = { pdf = "Span",       nature = "display" },
    msqrt              = { pdf = "Span",       nature = "display" },

}

tags.properties = properties

function tags.settagproperty(tag,key,value)
    local p = properties[tag]
    if p then
        p[key] = value
    else
        properties[tag] = { [key] = value }
    end
end

local lasttags = { }
local userdata = { }

tags.userdata = userdata

function tags.start(tag,specification)
    local label, detail, user
    if specification then
        label, detail, user = specification.label, specification.detail, specification.userdata
    end
    if not enabled then
        codeinjections.enabletags()
        enabled = true
    end
    labels[tag] = label ~= "" and label or tag
    local fulltag
    if detail and detail ~= "" then
        fulltag = tag .. ":" .. detail
    else
        fulltag = tag
    end
    local t = #taglist + 1
    local n = (ids[fulltag] or 0) + 1
    ids[fulltag] = n
    lasttags[tag] = n
--~ print("SETTING",tag,n)
    local completetag = fulltag .. "-" .. n
    chain[#chain+1] = completetag -- insert(chain,tag .. ":" .. n)
    stack[#stack+1] = t -- insert(stack,t)
    taglist[t] = { unpack(chain) } -- we can add key values for alt and actualtext if needed
    if user and user ~= "" then
        -- maybe we should merge this into taglistor or whatever ... anyway there is room to optimize
        -- taglist.userdata = settings_to_hash(user)
        userdata[completetag] = settings_to_hash(user)
    end
    texattribute[a_tagged] = t
    return t
end

function tags.stop()
    local t = stack[#stack] stack[#stack] = nil -- local t = remove(stack)
    if not t then
        if trace_tags then
            report_tags("ignoring end tag, previous chain: %s",#chain > 0 and concat(chain[#chain]) or "none")
        end
        t = unsetvalue
    else
        chain[#chain] = nil -- remove(chain)
    end
    texattribute[a_tagged] = t
    return t
end

function tags.last(tag)
    return lasttags[tag] -- or false
end

function structures.atlocation(str)
    local location = gsub(concat(taglist[texattribute[a_tagged]],"-"),"%-%d+","")
    return find(location,topattern(str)) ~= nil
end

function tags.handler(head)  -- we need a dummy
    return head, false
end

statistics.register("structure elements", function()
    if enabled then
        return format("%s element chains identified",#taglist)
    else
        return nil
    end
end)

directives.register("backend.addtags", function(v)
    if not enabled then
        codeinjections.enabletags()
        enabled = true
    end
end)