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LazyExecute = require '../lazy_execute.coffee'
Util = require '../util.coffee'
# This is an incredibly important object because the majority of the layer information
# is contained in layer info blocks. The keys of this object define how the layer info
# can be accessed. Each layer info block contains different data, so accessing the data
# within each differs from type to type.
#
# Here's an example of how to access some of this data:
#
# ``` coffeescript
# node = psd.tree().childrenAtPath('path/to/layer')[0]
# node.get('locked').allLocked
# node.get('metadata').data.layerComp
# node.get('typeTool').export()
# ```
LAYER_INFO = {
artboard: require('../layer_info/artboard.coffee')
blendClippingElements: require('../layer_info/blend_clipping_elements.coffee')
blendInteriorElements: require('../layer_info/blend_interior_elements.coffee')
fillOpacity: require('../layer_info/fill_opacity.coffee')
gradientFill: require('../layer_info/gradient_fill.coffee')
layerId: require('../layer_info/layer_id.coffee')
layerNameSource: require('../layer_info/layer_name_source.coffee')
legacyTypetool: require('../layer_info/legacy_typetool.coffee')
locked: require('../layer_info/locked.coffee')
metadata: require('../layer_info/metadata.coffee')
name: require('../layer_info/unicode_name.coffee')
nestedSectionDivider: require('../layer_info/nested_section_divider.coffee')
objectEffects: require('../layer_info/object_effects.coffee')
sectionDivider: require('../layer_info/section_divider.coffee')
solidColor: require('../layer_info/solid_color.coffee')
typeTool: require('../layer_info/typetool.coffee')
vectorMask: require('../layer_info/vector_mask.coffee')
vectorOrigination: require('../layer_info/vector_origination.coffee')
vectorStroke: require('../layer_info/vector_stroke.coffee')
vectorStrokeContent: require('../layer_info/vector_stroke_content.coffee')
}
module.exports =
parseLayerInfo: ->
# Layer info blocks are the last section in the layer, so we can continue until our
# file cursor reaches the end of the layer.
while @file.tell() < @layerEnd
@file.seek 4, true # sig
# Every layer info block is identified by a unique 4 character string.
key = @file.readString(4)
length = Util.pad2 @file.readInt()
pos = @file.tell()
keyParseable = false
for own name, klass of LAYER_INFO
continue unless klass.shouldParse(key)
# Once we find the right class to handle the layer info block, we create it and
# register it with LazyExecute. This allows us to parse the PSD significantly
# faster because we don't bother parsing the layer info block until it's accessed.
i = new klass(@, length)
@adjustments[name] = new LazyExecute(i, @file)
.now('skip')
.later('parse')
.get()
# We create a function that lets us easily access the data.
unless @[name]?
do (name) => @[name] = => @adjustments[name]
# For debugging purposes, we store every key that we can parse.
@infoKeys.push key
keyParseable = true
break
# If we don't know how to parse this particular layer info block, we can skip it since we
# know the end position of the data.
@file.seek length, true if not keyParseable