Advanced Parsing Overview

Inline Methods

Dynamic substitutions allow value calculation:

width: "{width:source}" # Width from the input "source".
height: "{height:source}" # Height from the input "source".
random_int: "{random:5,10}"
random_float: "{random:5.0,10.0}"
var: "{var:myvar}" # Value from previously assigned variable 'myvar'.
condition: "{exists:cache/mask.png}" # 1 if file exists. 0 if not.

Parsing

By default, any inline methods, like {var:…}, {random:…}, {exists:…}, {width:…}, and {height:…}are automatically evaluated.

For simple evaluations (e.g. 20 + 5), booleans, comparisons, and more, you can wrap your expression in double-brackets ([[ … ]]).

Color Values

Color strings are processed using PIL.ImageColor.getcolor(color_str, "RGBA"). Accepted formats include #RRGGBB, rgba(...), and named colors.

Numeric Values

Supports inline math and methods:

w: "100"
x: "{var: x}" # Previously assigned variable.
y: "[[ 20/2 + (10 * 10) - 10 ]]"
z: "[[ {width:source}/2 ]]" # Inline math using input metadata.

Point Values

Coordinates can be specified as absolute or relative:

Absolute:

anchor: "(100,20)"
anchor2: "([[50*2]], {height:source})"

Relative:

relative_anchor: "rel(0.5,0.5)" # Relative to contextual value.

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Behavior and Inheritance

• Variable Inheritance:
  Nested jobs inherit the parent's variables (including those set via assign blocks) for inline substitutions.

• Override Inheritance:
  Nested jobs inherit a copy of the parent's structured overrides, merged into the nested job's definition during execution.

• Isolation:
  Changes within a nested job (including overrides and variable assignments) do not affect the parent job.

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Inline Methods (Always Parsed)

• What: {var:…}, {exists:…}, {random:…}, {width:…}, {height:…}, rel(…), etc.
• When: Always applied first, on every value, before any math or condition logic.
• Nesting: If you write an inline method inside another (e.g. {var:myvar{random:1,10}}), the inner {random:…} runs first, then its result feeds into the outer {var:…} lookup.

Double-bracket parsing

• Trigger: Any value containing [[…]].
• Scope: Only the text inside each [[…]] is evaluated—everything else remains exactly as written.
• Capabilities:
  • Full boolean & comparison logic
  • Ternary expressions (a if cond else b)
  • Tuple math ((x+5, y*0.5))
  • Math functions (abs(), round(), min(), max(), math.floor(), etc.)
  • Inline methods can still be used inside [[…]].

Escaping Brackets

• To include literal [[ or ]] without triggering advanced evaluation, prefix them with a backslash:

  message: "\[\[ escaped double brackets \]\]"
  

• You can mix escapes and eval:

  text: "\[\[unparsed\]\] 2+2=[[ 2 + 2 ]]"
  # → "[[unparsed]] 2+2=4"
  

Examples

• Arithmetic & Math

  • + - * / % **
  • e.g. [[ ({var:width} + {var:padding}) * 2 ]]

• Booleans & Comparisons

  • and, or, not
  • <, <=, >, >=, ==, !=
  • e.g. [[ not {var:done} ]]
  • e.g. [[ {var:count} > 3 and {var:flag} ]]

• Ternary (Conditional) Expressions

  • a if cond else b
  • e.g. [[ {var:padding} if {var:width} > 1000 else 10 ]]

• Math Functions

  • abs(), round(), min(), max(), math.floor(), math.ceil(), math.sqrt()
  • e.g. [[ round( max({var:width}, {var:height}) / 2 ) ]]

• Inline Methods Inside Brackets

  • You can mix any inline method inside your bracketed expressions:
    • {var:…} for variables
    • {exists:…} for file existence
    • {random:…}, {width:…}, {height:…}, etc.

Examples

# 1) Conditional step
- processor:
    processor: "trim"
    condition: "[[ {width:source} > 800 ]]"

    # 2) Ternary padding
    params:
      padding: "[[ {var:padding} if {width:source} >= 1024 else 10 ]]"

# 3) Composite anchors with tuple math
- processor:
    processor: "composite"
    params:
      overlay_anchor: " ( [[{width:background}/2]], [[{height:background}/2]] ) "

# 4) Boolean + exists + var
- processor:
    processor: "inpaint"
    condition: '[[ "{exists:cache/mask.png}" and not {var:skipped} ]]'

    # 5) Using math functions
    params:
      blur_radius: "[[ round( {var:shadow_scale} * 2.5 ) ]]"

# 6) Comparison with multiple vars
- processor:
    processor: "example"
    condition: "[[ {var:count} > 3 and {var:enabled} ]]"