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The Plan definition
Plan contains one or multiple Areas, also called rooms.
Each plan has ID code: three four-character alphanumeric blocks, like 'ABC1-DEF2-GHI3'.
Area's walls can be attached to walls in another area of the plan by reference.
Walls in area are ordered counter-clockwise and referred by order number.

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Comments:

• single line comment: //

Separators:

• wall number: .
• areas/walls: (;|\n)
• items in line: ,
• references: :

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Area definition:
<area name>(,<wall type, default=B1.5>)(,<walls height, default=280>)((;|\n)<wall definition>)+

- samples:
Bathroom
Bedroom, B1, 260

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Wall definition:
(<wall number>. )(<wall type, default='B1'>, )(<auto-close>)<wall length>([<wall constraint>])(,<wall insert>)+

- samples:
1. 400
2. 200+150
3. 350 *0;350[^320] 400,W160[C] 400,W160[C];300[Z]

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Wall insert:
D<width>(x<height>)[<insert constraint>]({<quantifier>}) // Door
P<width>(x<height>)[<insert constraint>]({<quantifier>}) // Portal
W<width>(x<height>)[<insert constraint>]({<quantifier>}) // Window
N<width>x<height>x<depth>)[<insert constraint>]({<quantifier>}) // Niche

- samples:
D80[C]
W180x100[L10]
W80x40[L20/120]{5x30}

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Insert constraint:
<horizontal constraint code><constraint value>(<vertical constraint code><constraint value>)

- samples:
R100
C-10/40
R100\10

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Horizontal constraint code:
L - Left alignment in referenced wall
R - Right alignment in referenced wall
C - Center alignment in referenced wall

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Vertical constraint code:
/ - Bottom clearance from base
\ - Top clearance from ceiling

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Quantifier: <d{1,2}>x<d{1,3}>

- samples
2x60
12x3
15x110

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Wall constraint:
(<wall reference>:)<wall constraint code>(<constraint value>)

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Wall constraint code:
- attachments, require wall reference:
L - Left alighment in referenced wall, preserving length
R - Right alighment in referenced wall, preserving length
C - Center alighment in referenced wall, preserving length
X - Justified alighment in referenced wall, length calculated till parent wall end

- angular:
Z - 90deg CCW orientation to preceding wall
< - Arbitrary orientation angle to preceding wall
^ - Triangulation distance from this wall end to the preceding wall's start

- samples:
L120
R-40
<110
^320

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Constraint value: d{1,3}

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Wall reference: (-)<area shortcut>.<wall number>:

- samples:
Apart-1.1:
AP1.3:
WC.4:
Master-bedroom.3:

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Area name: [A-Za-z_-0-9]

- samples:
Area1
Master_bedroom-1
WC-2
Kitchen

Area shortcut: $shortcut(<area name>)

- samples:
Master_Bedroom-1
[MB, MB1, MaB, MAB1]

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Wall length: d{1,3}

- samples:
80
120
450

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Auto-close: *

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Wall number: d{1,2}

- samples:
1
12

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Wall type:

B1.5      // 1.5 bricks (40cm)
B1        // 1 brick    (28cm)
B0.5      // 0.5 brick  (15cm)
PA        // Plasterboard slim profile, single (7,5cm)
PB        // Plasterboard default profile, single (10cm)
PC        // Plasterboard wide profile, single (12,5cm)
PA2       // Plasterboard slim profile, double (10cm)
PB2       // Plasterboard default profile, double (12,5cm)
PC2       // Plasterboard wide profile, double (15cm)
W         // Wood (12cm)
C<d{1,2}> // Concrete, custom thickness (in cm)