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{"version":3,"file":"preprocessor.js","names":["assert","State","Directive","constructor","depth","checkDepth","stack","length","If","predicate","applyTo","parentState","state","push","allowsFollowingElse","Passing","Skipping","Seeking","ElseIf","siblingState","pop","Else","EndIf","pp","strings","values","result","stateStack","i","passing","value","_if","_elif","_else","_endif","__if","__elif","__else","__endif","___if","___elif","___else","___endif"],"sources":["../../../src/common/util/preprocessor.ts"],"sourcesContent":["import { assert } from './util.js';\n\n// The state of the preprocessor is a stack of States.\ntype StateStack = { allowsFollowingElse: boolean; state: State }[];\nconst enum State {\n Seeking, // Still looking for a passing condition\n Passing, // Currently inside a passing condition (the root is always in this state)\n Skipping, // Have already seen a passing condition; now skipping the rest\n}\n\n// The transitions in the state space are the following preprocessor directives:\n// - Sibling elif\n// - Sibling else\n// - Sibling endif\n// - Child if\nabstract class Directive {\n private readonly depth: number;\n\n constructor(depth: number) {\n this.depth = depth;\n }\n\n protected checkDepth(stack: StateStack): void {\n assert(\n stack.length === this.depth,\n `Number of \"$\"s must match nesting depth, currently ${stack.length} (e.g. $if $$if $$endif $endif)`\n );\n }\n\n abstract applyTo(stack: StateStack): void;\n}\n\nclass If extends Directive {\n private readonly predicate: boolean;\n\n constructor(depth: number, predicate: boolean) {\n super(depth);\n this.predicate = predicate;\n }\n\n applyTo(stack: StateStack) {\n this.checkDepth(stack);\n const parentState = stack[stack.length - 1].state;\n stack.push({\n allowsFollowingElse: true,\n state:\n parentState !== State.Passing\n ? State.Skipping\n : this.predicate\n ? State.Passing\n : State.Seeking,\n });\n }\n}\n\nclass ElseIf extends If {\n applyTo(stack: StateStack) {\n assert(stack.length >= 1);\n const { allowsFollowingElse, state: siblingState } = stack.pop()!;\n this.checkDepth(stack);\n assert(allowsFollowingElse, 'pp.elif after pp.else');\n if (siblingState !== State.Seeking) {\n stack.push({ allowsFollowingElse: true, state: State.Skipping });\n } else {\n super.applyTo(stack);\n }\n }\n}\n\nclass Else extends Directive {\n applyTo(stack: StateStack) {\n assert(stack.length >= 1);\n const { allowsFollowingElse, state: siblingState } = stack.pop()!;\n this.checkDepth(stack);\n assert(allowsFollowingElse, 'pp.else after pp.else');\n stack.push({\n allowsFollowingElse: false,\n state: siblingState === State.Seeking ? State.Passing : State.Skipping,\n });\n }\n}\n\nclass EndIf extends Directive {\n applyTo(stack: StateStack) {\n stack.pop();\n this.checkDepth(stack);\n }\n}\n\n/**\n * A simple template-based, non-line-based preprocessor implementing if/elif/else/endif.\n *\n * @example\n * ```\n * const shader = pp`\n * ${pp._if(expr)}\n * const x: ${type} = ${value};\n * ${pp._elif(expr)}\n * ${pp.__if(expr)}\n * ...\n * ${pp.__else}\n * ...\n * ${pp.__endif}\n * ${pp._endif}`;\n * ```\n *\n * @param strings - The array of constant string chunks of the template string.\n * @param ...values - The array of interpolated `${}` values within the template string.\n */\nexport function pp(\n strings: TemplateStringsArray,\n ...values: ReadonlyArray<Directive | string | number>\n): string {\n let result = '';\n const stateStack: StateStack = [{ allowsFollowingElse: false, state: State.Passing }];\n\n for (let i = 0; i < values.length; ++i) {\n const passing = stateStack[stateStack.length - 1].state === State.Passing;\n if (passing) {\n result += strings[i];\n }\n\n const value = values[i];\n if (value instanceof Directive) {\n value.applyTo(stateStack);\n } else {\n if (passing) {\n result += value;\n }\n }\n }\n assert(stateStack.length === 1, 'Unterminated preprocessor condition at end of file');\n result += strings[values.length];\n\n return result;\n}\npp._if = (predicate: boolean) => new If(1, predicate);\npp._elif = (predicate: boolean) => new ElseIf(1, predicate);\npp._else = new Else(1);\npp._endif = new EndIf(1);\npp.__if = (predicate: boolean) => new If(2, predicate);\npp.__elif = (predicate: boolean) => new ElseIf(2, predicate);\npp.__else = new Else(2);\npp.__endif = new EndIf(2);\npp.___if = (predicate: boolean) => new If(3, predicate);\npp.___elif = (predicate: boolean) => new ElseIf(3, predicate);\npp.___else = new Else(3);\npp.___endif = new EndIf(3);\n// Add more if 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