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{"version":3,"file":null,"sources":["src/utils.js","src/nodes.js","src/grammar.js","src/SymbolTable.js","src/dfa.js","src/StateMachine.js","src/compile.js"],"sourcesContent":["/**\n * Returns a new set representing the union of a and b.\n */\nexport function union(a, b) {\n let s = new Set(a);\n addAll(s, b);\n return s;\n}\n\n/**\n * Adds all items from the set b to a.\n */\nexport function addAll(a, b) {\n for (let x of b) {\n a.add(x);\n }\n}\n\n/**\n * Returns whether two sets are equal\n */\nexport function equal(a, b) {\n if (a === b)\n return true;\n\n if (a.size !== b.size)\n return false;\n\n for (let x of a) {\n if (!b.has(x)) {\n return false;\n }\n }\n\n return true;\n}\n","import {addAll, union} from './utils';\n\n/**\n * Base AST node\n */\nexport class Node {\n constructor() {\n Object.defineProperty(this, 'followpos', {value: new Set})\n }\n\n calcFollowpos() {\n for (let key in this) {\n if (this[key] instanceof Node) {\n this[key].calcFollowpos();\n }\n }\n }\n}\n\n/**\n * Represents a variable reference\n */\nexport class Variable extends Node {\n constructor(name) {\n super();\n this.name = name;\n }\n}\n\n/**\n * Represents a comment\n */\nexport class Comment extends Node {\n constructor(value) {\n super();\n this.value = value;\n }\n}\n\n/**\n * Represents an assignment statement.\n * e.g. `variable = expression;`\n */\nexport class Assignment extends Node {\n constructor(variable, expression) {\n super();\n this.variable = variable;\n this.expression = expression;\n }\n}\n\n/**\n * Represents an alternation.\n * e.g. `a | b`\n */\nexport class Alternation extends Node {\n constructor(a, b) {\n super();\n this.a = a;\n this.b = b;\n }\n\n get nullable() {\n return this.a.nullable || this.b.nullable;\n }\n\n get firstpos() {\n return union(this.a.firstpos, this.b.firstpos);\n }\n\n get lastpos() {\n return union(this.a.lastpos, this.b.lastpos);\n }\n\n copy() {\n return new Alternation(this.a.copy(), this.b.copy());\n }\n}\n\n/**\n * Represents a concatenation, or chain.\n * e.g. `a b c`\n */\nexport class Concatenation extends Node {\n constructor(a, b) {\n super();\n this.a = a;\n this.b = b;\n }\n\n get nullable() {\n return this.a.nullable && this.b.nullable;\n }\n\n get firstpos() {\n let s = this.a.firstpos;\n if (this.a.nullable) {\n s = union(s, this.b.firstpos);\n }\n\n return s;\n }\n\n get lastpos() {\n let s = this.b.lastpos;\n if (this.b.nullable) {\n s = union(s, this.a.lastpos);\n }\n\n return s;\n }\n\n calcFollowpos() {\n super.calcFollowpos();\n for (let n of this.a.lastpos) {\n addAll(n.followpos, this.b.firstpos);\n }\n }\n\n copy() {\n return new Concatenation(this.a.copy(), this.b.copy());\n }\n}\n\n/**\n * Represents a repetition.\n * e.g. `a+`, `b*`, or `c?`\n */\nexport class Repeat extends Node {\n constructor(expression, op) {\n super();\n this.expression = expression;\n this.op = op;\n }\n\n get nullable() {\n return this.op === '*' || this.op === '?';\n }\n\n get firstpos() {\n return this.expression.firstpos;\n }\n\n get lastpos() {\n return this.expression.lastpos;\n }\n\n calcFollowpos() {\n super.calcFollowpos();\n if (this.op === '*' || this.op === '+') {\n for (let n of this.lastpos) {\n addAll(n.followpos, this.firstpos);\n }\n }\n }\n\n copy() {\n return new Repeat(this.expression.copy(), this.op);\n }\n}\n\n/**\n * Base class for leaf nodes\n */\nclass Leaf extends Node {\n get nullable() {\n return false;\n }\n\n get firstpos() {\n return new Set([this]);\n }\n\n get lastpos() {\n return new Set([this]);\n }\n}\n\n/**\n * Represents a literal value, e.g. a number\n */\nexport class Literal extends Leaf {\n constructor(value) {\n super();\n this.value = value;\n }\n\n copy() {\n return new Literal(this.value);\n }\n}\n\n/**\n * Marks the end of an expression\n */\nexport class EndMarker
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