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-rw-r--r--llparse-builder/.gitignore3
-rw-r--r--llparse-builder/.travis.yml4
-rw-r--r--llparse-builder/README.md32
-rw-r--r--llparse-builder/package-lock.json1466
-rw-r--r--llparse-builder/package.json48
-rw-r--r--llparse-builder/src/builder.ts147
-rw-r--r--llparse-builder/src/code/and.ts7
-rw-r--r--llparse-builder/src/code/base.ts16
-rw-r--r--llparse-builder/src/code/creator.ts184
-rw-r--r--llparse-builder/src/code/field-value.ts9
-rw-r--r--llparse-builder/src/code/field.ts10
-rw-r--r--llparse-builder/src/code/index.ts15
-rw-r--r--llparse-builder/src/code/is-equal.ts7
-rw-r--r--llparse-builder/src/code/load.ts7
-rw-r--r--llparse-builder/src/code/match.ts7
-rw-r--r--llparse-builder/src/code/mul-add.ts28
-rw-r--r--llparse-builder/src/code/or.ts7
-rw-r--r--llparse-builder/src/code/span.ts5
-rw-r--r--llparse-builder/src/code/store.ts7
-rw-r--r--llparse-builder/src/code/test.ts7
-rw-r--r--llparse-builder/src/code/update.ts7
-rw-r--r--llparse-builder/src/code/value.ts7
-rw-r--r--llparse-builder/src/edge.ts54
-rw-r--r--llparse-builder/src/loop-checker/index.ts205
-rw-r--r--llparse-builder/src/loop-checker/lattice.ts115
-rw-r--r--llparse-builder/src/node/base.ts96
-rw-r--r--llparse-builder/src/node/consume.ts19
-rw-r--r--llparse-builder/src/node/error.ts24
-rw-r--r--llparse-builder/src/node/index.ts8
-rw-r--r--llparse-builder/src/node/invoke.ts39
-rw-r--r--llparse-builder/src/node/match.ts162
-rw-r--r--llparse-builder/src/node/pause.ts25
-rw-r--r--llparse-builder/src/node/span-end.ts19
-rw-r--r--llparse-builder/src/node/span-start.ts16
-rw-r--r--llparse-builder/src/property.ts12
-rw-r--r--llparse-builder/src/reachability.ts31
-rw-r--r--llparse-builder/src/span-allocator.ts182
-rw-r--r--llparse-builder/src/span.ts57
-rw-r--r--llparse-builder/src/transform/base.ts12
-rw-r--r--llparse-builder/src/transform/creator.ts28
-rw-r--r--llparse-builder/src/transform/index.ts3
-rw-r--r--llparse-builder/src/transform/to-lower-unsafe.ts7
-rw-r--r--llparse-builder/src/transform/to-lower.ts7
-rw-r--r--llparse-builder/src/utils.ts19
-rw-r--r--llparse-builder/test/builder-test.ts94
-rw-r--r--llparse-builder/test/loop-checker-test.ts118
-rw-r--r--llparse-builder/test/span-allocator-test.ts146
-rw-r--r--llparse-builder/tsconfig.json15
-rw-r--r--llparse-builder/tslint.json14
49 files changed, 3557 insertions, 0 deletions
diff --git a/llparse-builder/.gitignore b/llparse-builder/.gitignore
new file mode 100644
index 0000000..5e67ab3
--- /dev/null
+++ b/llparse-builder/.gitignore
@@ -0,0 +1,3 @@
+node_modules/
+npm-debug.log
+lib/
diff --git a/llparse-builder/.travis.yml b/llparse-builder/.travis.yml
new file mode 100644
index 0000000..b5efd79
--- /dev/null
+++ b/llparse-builder/.travis.yml
@@ -0,0 +1,4 @@
+sudo: false
+language: node_js
+node_js:
+ - "stable"
diff --git a/llparse-builder/README.md b/llparse-builder/README.md
new file mode 100644
index 0000000..522fba2
--- /dev/null
+++ b/llparse-builder/README.md
@@ -0,0 +1,32 @@
+# llparse-builder
+[![Build Status](https://secure.travis-ci.org/indutny/llparse-builder.svg)](http://travis-ci.org/indutny/llparse-builder)
+[![NPM version](https://badge.fury.io/js/llparse-builder.svg)](https://badge.fury.io/js/llparse-builder)
+
+See [llparse][0].
+
+#### LICENSE
+
+This software is licensed under the MIT License.
+
+Copyright Fedor Indutny, 2018.
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to permit
+persons to whom the Software is furnished to do so, subject to the
+following conditions:
+
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+[0]: https://github.com/indutny/llparse
diff --git a/llparse-builder/package-lock.json b/llparse-builder/package-lock.json
new file mode 100644
index 0000000..5e76f34
--- /dev/null
+++ b/llparse-builder/package-lock.json
@@ -0,0 +1,1466 @@
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diff --git a/llparse-builder/package.json b/llparse-builder/package.json
new file mode 100644
index 0000000..1c1ac54
--- /dev/null
+++ b/llparse-builder/package.json
@@ -0,0 +1,48 @@
+{
+ "name": "llparse-builder",
+ "version": "1.5.2",
+ "description": "Build graph for consumption in LLParse",
+ "main": "lib/builder.js",
+ "types": "lib/builder.d.ts",
+ "files": [
+ "lib",
+ "src"
+ ],
+ "scripts": {
+ "build": "tsc",
+ "clean": "rm -rf lib",
+ "prepare": "npm run clean && npm run build",
+ "lint": "tslint -c tslint.json src/*.ts src/**/*.ts src/**/**/*.ts test/*.ts",
+ "mocha": "mocha -r ts-node/register/type-check --reporter spec test/*-test.ts",
+ "test": "npm run mocha && npm run lint"
+ },
+ "repository": {
+ "type": "git",
+ "url": "git+ssh://git@github.com/indutny/llparse-builder.git"
+ },
+ "keywords": [
+ "llparse",
+ "builder",
+ "llvm",
+ "bitcode"
+ ],
+ "author": "Fedor Indutny <fedor@indutny.com> (http://darksi.de/)",
+ "license": "MIT",
+ "bugs": {
+ "url": "https://github.com/indutny/llparse-builder/issues"
+ },
+ "homepage": "https://github.com/indutny/llparse-builder#readme",
+ "devDependencies": {
+ "@types/mocha": "^8.0.3",
+ "@types/node": "^14.11.8",
+ "mocha": "^8.1.3",
+ "ts-node": "^9.0.0",
+ "tslint": "^5.20.1",
+ "typescript": "^4.0.3"
+ },
+ "dependencies": {
+ "@types/debug": "4.1.5 ",
+ "binary-search": "^1.3.6",
+ "debug": "^4.2.0"
+ }
+}
diff --git a/llparse-builder/src/builder.ts b/llparse-builder/src/builder.ts
new file mode 100644
index 0000000..a335a85
--- /dev/null
+++ b/llparse-builder/src/builder.ts
@@ -0,0 +1,147 @@
+import * as code from './code';
+import * as node from './node';
+import { Property, PropertyType } from './property';
+import { Span } from './span';
+import * as transform from './transform';
+
+export { code, node, transform, Property, PropertyType, Span };
+export { Edge } from './edge';
+export { LoopChecker } from './loop-checker';
+export { ISpanAllocatorResult, SpanAllocator } from './span-allocator';
+export { Reachability } from './reachability';
+
+/**
+ * Construct parsing graph for later use in `llparse`.
+ */
+export class Builder {
+ /**
+ * API for creating external callbacks and intrinsic operations.
+ */
+ public readonly code: code.Creator = new code.Creator();
+
+ /**
+ * API for creating character transforms for use in nodes created with
+ * `builder.node()`
+ */
+ public readonly transform: transform.Creator = new transform.Creator();
+
+ private readonly privProperties: Map<string, Property> = new Map();
+
+ // Various nodes
+
+ /**
+ * Create regular node for matching characters and sequences.
+ *
+ * @param name Node name
+ */
+ public node(name: string): node.Match {
+ return new node.Match(name);
+ }
+
+ /**
+ * Create terminal error node. Returns error code to user, and sets reason
+ * in the parser's state object.
+ *
+ * This node does not consume any bytes upon execution.
+ *
+ * @param errorCode Integer error code
+ * @param reason Error description
+ */
+ public error(errorCode: number, reason: string): node.Error {
+ return new node.Error(errorCode, reason);
+ }
+
+ /**
+ * Create invoke node that calls either external user callback or an
+ * intrinsic operation.
+ *
+ * This node does not consume any bytes upon execution.
+ *
+ * NOTE: When `.invoke()` is a target of `node().select()` - callback must
+ * have signature that accepts `.select()`'s value, otherwise it must be of
+ * the signature that takes no such value.
+ *
+ * @param fn Code instance to invoke
+ * @param map Object with integer keys and `Node` values. Describes
+ * nodes that are visited upon receiving particular
+ * return integer value
+ * @param otherwise Convenience `Node` argument. Effect is the same as calling
+ * `p.invoke(...).otherwise(node)`
+ */
+ public invoke(fn: code.Code, map?: node.IInvokeMap | node.Node,
+ otherwise?: node.Node): node.Invoke {
+ let res: node.Invoke;
+
+ // `.invoke(name)`
+ if (map === undefined) {
+ res = new node.Invoke(fn, {});
+ // `.invoke(name, otherwise)`
+ } else if (map instanceof node.Node) {
+ res = new node.Invoke(fn, {});
+ otherwise = map;
+ } else {
+ res = new node.Invoke(fn, map as node.IInvokeMap);
+ }
+
+ if (otherwise !== undefined) {
+ res.otherwise(otherwise);
+ }
+ return res;
+ }
+
+ /**
+ * Create node that consumes number of bytes specified by value of the
+ * state's property with name in `field` argument.
+ *
+ * @param field Property name to use
+ */
+ public consume(field: string): node.Consume {
+ return new node.Consume(field);
+ }
+
+ /**
+ * Create non-terminal node that returns `errorCode` as error number to
+ * user, but still allows feeding more data to the parser.
+ *
+ * This node does not consume any bytes upon execution.
+ *
+ * @param errorCode Integer error code
+ * @param reason Error description
+ */
+ public pause(errorCode: number, reason: string): node.Pause {
+ return new node.Pause(errorCode, reason);
+ }
+
+ // Span
+
+ /**
+ * Create Span with given `callback`.
+ *
+ * @param callback External span callback, must be result of
+ * `.code.span(...)`
+ */
+ public span(callback: code.Span): Span {
+ return new Span(callback);
+ }
+
+ // Custom property API
+
+ /**
+ * Allocate space for property in parser's state.
+ */
+ public property(ty: PropertyType, name: string): void {
+ if (this.privProperties.has(name)) {
+ throw new Error(`Duplicate property with a name: "${name}"`);
+ }
+
+ const prop = new Property(ty, name);
+ this.privProperties.set(name, prop);
+ }
+
+ /**
+ * Return list of all allocated properties in parser's state.
+ */
+ public get properties(): ReadonlyArray<Property> {
+ return Array.from(this.privProperties.values());
+ }
+}
diff --git a/llparse-builder/src/code/and.ts b/llparse-builder/src/code/and.ts
new file mode 100644
index 0000000..5f78675
--- /dev/null
+++ b/llparse-builder/src/code/and.ts
@@ -0,0 +1,7 @@
+import { FieldValue } from './field-value';
+
+export class And extends FieldValue {
+ constructor(field: string, value: number) {
+ super('match', 'and', field, value);
+ }
+}
diff --git a/llparse-builder/src/code/base.ts b/llparse-builder/src/code/base.ts
new file mode 100644
index 0000000..00b479f
--- /dev/null
+++ b/llparse-builder/src/code/base.ts
@@ -0,0 +1,16 @@
+export type Signature = 'match' | 'value';
+
+/**
+ * Base code class.
+ */
+export abstract class Code {
+ /**
+ * @param signature Code signature to be used. `match` means that code takes
+ * no input value (from `.select()`), otherwise it must be
+ * `value`
+ * @param name External function or intrinsic name.
+ */
+ constructor(public readonly signature: Signature,
+ public readonly name: string) {
+ }
+}
diff --git a/llparse-builder/src/code/creator.ts b/llparse-builder/src/code/creator.ts
new file mode 100644
index 0000000..98f9296
--- /dev/null
+++ b/llparse-builder/src/code/creator.ts
@@ -0,0 +1,184 @@
+import * as code from './';
+
+/**
+ * API for creating external callbacks and intrinsic operations.
+ */
+export class Creator {
+ // Callbacks to external C functions
+
+ /**
+ * Create an external callback that **has no** `value` argument.
+ *
+ * This callback can be used in all `Invoke` nodes except those that are
+ * targets of `.select()` method.
+ *
+ * C signature of callback must be:
+ *
+ * ```c
+ * int name(llparse_t* state, const char* p, const char* endp)
+ * ```
+ *
+ * Where `llparse_t` is parser state's type name.
+ *
+ * @param name External function name.
+ */
+ public match(name: string): code.Match {
+ return new code.Match(name);
+ }
+
+ /**
+ * Create an external callback that **has** `value` argument.
+ *
+ * This callback can be used only in `Invoke` nodes that are targets of
+ * `.select()` method.
+ *
+ * C signature of callback must be:
+ *
+ * ```c
+ * int name(llparse_t* state, const char* p, const char* endp, int value)
+ * ```
+ *
+ * Where `llparse_t` is parser state's type name.
+ *
+ * @param name External function name.
+ */
+ public value(name: string): code.Value {
+ return new code.Value(name);
+ }
+
+ /**
+ * Create an external span callback.
+ *
+ * This callback can be used only in `Span` constructor.
+ *
+ * C signature of callback must be:
+ *
+ * ```c
+ * int name(llparse_t* state, const char* p, const char* endp)
+ * ```
+ *
+ * NOTE: non-zero return value is treated as resumable error.
+ *
+ * @param name External function name.
+ */
+ public span(name: string): code.Span {
+ return new code.Span(name);
+ }
+
+ // Helpers
+
+ /**
+ * Intrinsic operation. Stores `value` from `.select()` node into the state's
+ * property with the name specified by `field`, returns zero.
+ *
+ * state[field] = value;
+ * return 0;
+ *
+ * @param field Property name
+ */
+ public store(field: string): code.Store {
+ return new code.Store(field);
+ }
+
+ /**
+ * Intrinsic operation. Loads and returns state's property with the name
+ * specified by `field`.
+ *
+ * The value of the property is either truncated or zero-extended to fit into
+ * 32-bit unsigned integer.
+ *
+ * return state[field];
+ *
+ * @param field Property name.
+ */
+ public load(field: string): code.Load {
+ return new code.Load(field);
+ }
+
+ /**
+ * Intrinsic operation. Takes `value` from `.select()`, state's property
+ * with the name `field` and does:
+ *
+ * field = state[field];
+ * field *= options.base;
+ * field += value;
+ * state[field] = field;
+ * return 0; // or 1 on overflow
+ *
+ * Return values are:
+ *
+ * - 0 - success
+ * - 1 - overflow
+ *
+ * @param field Property name
+ * @param options See `code.MulAdd` documentation.
+ */
+ public mulAdd(field: string, options: code.IMulAddOptions): code.MulAdd {
+ return new code.MulAdd(field, options);
+ }
+
+ /**
+ * Intrinsic operation. Puts `value` integer into the state's property with
+ * the name specified by `field`.
+ *
+ * state[field] = value;
+ * return 0;
+ *
+ * @param field Property name
+ * @param value Integer value to be stored into the property.
+ */
+ public update(field: string, value: number): code.Update {
+ return new code.Update(field, value);
+ }
+
+ /**
+ * Intrinsic operation. Returns 1 if the integer `value` is equal to the
+ * state's property with the name specified by `field`.
+ *
+ * return state[field] === value ? 1 : 0;
+ *
+ * @param field Property name
+ * @param value Integer value to be checked against.
+ */
+ public isEqual(field: string, value: number): code.IsEqual {
+ return new code.IsEqual(field, value);
+ }
+
+ /**
+ * Intrinsic operation.
+ *
+ * state[field] &= value
+ * return 0;
+ *
+ * @param field Property name
+ * @param value Integer value
+ */
+ public and(field: string, value: number): code.And {
+ return new code.And(field, value);
+ }
+
+ /**
+ * Intrinsic operation.
+ *
+ * state[field] |= value
+ * return 0;
+ *
+ * @param field Property name
+ * @param value Integer value
+ */
+ public or(field: string, value: number): code.Or {
+ return new code.Or(field, value);
+ }
+
+ /**
+ * Intrinsic operation.
+ *
+ * return (state[field] & value) == value ? 1 : 0;
+ *
+ * @param field Property name
+ * @param value Integer value
+ */
+ public test(field: string, value: number): code.Test {
+ return new code.Test(field, value);
+ }
+}
diff --git a/llparse-builder/src/code/field-value.ts b/llparse-builder/src/code/field-value.ts
new file mode 100644
index 0000000..2ceea69
--- /dev/null
+++ b/llparse-builder/src/code/field-value.ts
@@ -0,0 +1,9 @@
+import { Signature } from './base';
+import { Field } from './field';
+
+export abstract class FieldValue extends Field {
+ constructor(signature: Signature, name: string, field: string,
+ public readonly value: number) {
+ super(signature, name, field);
+ }
+}
diff --git a/llparse-builder/src/code/field.ts b/llparse-builder/src/code/field.ts
new file mode 100644
index 0000000..af58c84
--- /dev/null
+++ b/llparse-builder/src/code/field.ts
@@ -0,0 +1,10 @@
+import * as assert from 'assert';
+import { Code, Signature } from './base';
+
+export abstract class Field extends Code {
+ constructor(signature: Signature, name: string,
+ public readonly field: string) {
+ super(signature, name + '_' + field);
+ assert(!/^_/.test(field), 'Can\'t access internal field from user code');
+ }
+}
diff --git a/llparse-builder/src/code/index.ts b/llparse-builder/src/code/index.ts
new file mode 100644
index 0000000..7a651e3
--- /dev/null
+++ b/llparse-builder/src/code/index.ts
@@ -0,0 +1,15 @@
+export { Code } from './base';
+export { Creator } from './creator';
+export { Field } from './field';
+export { FieldValue } from './field-value';
+export { IsEqual } from './is-equal';
+export { Load } from './load';
+export { Match } from './match';
+export { IMulAddOptions, MulAdd } from './mul-add';
+export { Or } from './or';
+export { And } from './and';
+export { Span } from './span';
+export { Store } from './store';
+export { Test } from './test';
+export { Update } from './update';
+export { Value } from './value';
diff --git a/llparse-builder/src/code/is-equal.ts b/llparse-builder/src/code/is-equal.ts
new file mode 100644
index 0000000..91bb957
--- /dev/null
+++ b/llparse-builder/src/code/is-equal.ts
@@ -0,0 +1,7 @@
+import { FieldValue } from './field-value';
+
+export class IsEqual extends FieldValue {
+ constructor(field: string, value: number) {
+ super('match', 'is_equal', field, value);
+ }
+}
diff --git a/llparse-builder/src/code/load.ts b/llparse-builder/src/code/load.ts
new file mode 100644
index 0000000..9f3df2e
--- /dev/null
+++ b/llparse-builder/src/code/load.ts
@@ -0,0 +1,7 @@
+import { Field } from './field';
+
+export class Load extends Field {
+ constructor(field: string) {
+ super('match', 'load', field);
+ }
+}
diff --git a/llparse-builder/src/code/match.ts b/llparse-builder/src/code/match.ts
new file mode 100644
index 0000000..631376a
--- /dev/null
+++ b/llparse-builder/src/code/match.ts
@@ -0,0 +1,7 @@
+import { Code } from './base';
+
+export class Match extends Code {
+ constructor(name: string) {
+ super('match', name);
+ }
+}
diff --git a/llparse-builder/src/code/mul-add.ts b/llparse-builder/src/code/mul-add.ts
new file mode 100644
index 0000000..fd648ed
--- /dev/null
+++ b/llparse-builder/src/code/mul-add.ts
@@ -0,0 +1,28 @@
+import { Field } from './field';
+
+/**
+ * Options for `code.mulAdd()`.
+ */
+export interface IMulAddOptions {
+ /** Value to multiply the property with in the first step */
+ readonly base: number;
+
+ /**
+ * Maximum value of the property. If at any point of computation the
+ * intermediate result exceeds it - `mulAdd` returns 1 (overflow).
+ */
+ readonly max?: number;
+
+ /**
+ * If `true` - all arithmetics perfomed by `mulAdd` will be signed.
+ *
+ * Default value: `false`
+ */
+ readonly signed?: boolean;
+}
+
+export class MulAdd extends Field {
+ constructor(field: string, public readonly options: IMulAddOptions) {
+ super('value', 'mul_add', field);
+ }
+}
diff --git a/llparse-builder/src/code/or.ts b/llparse-builder/src/code/or.ts
new file mode 100644
index 0000000..33bd402
--- /dev/null
+++ b/llparse-builder/src/code/or.ts
@@ -0,0 +1,7 @@
+import { FieldValue } from './field-value';
+
+export class Or extends FieldValue {
+ constructor(field: string, value: number) {
+ super('match', 'or', field, value);
+ }
+}
diff --git a/llparse-builder/src/code/span.ts b/llparse-builder/src/code/span.ts
new file mode 100644
index 0000000..b97e09e
--- /dev/null
+++ b/llparse-builder/src/code/span.ts
@@ -0,0 +1,5 @@
+import { Match } from './match';
+
+export class Span extends Match {
+ // no-op
+}
diff --git a/llparse-builder/src/code/store.ts b/llparse-builder/src/code/store.ts
new file mode 100644
index 0000000..84abfef
--- /dev/null
+++ b/llparse-builder/src/code/store.ts
@@ -0,0 +1,7 @@
+import { Field } from './field';
+
+export class Store extends Field {
+ constructor(field: string) {
+ super('value', 'store', field);
+ }
+}
diff --git a/llparse-builder/src/code/test.ts b/llparse-builder/src/code/test.ts
new file mode 100644
index 0000000..a9d0a22
--- /dev/null
+++ b/llparse-builder/src/code/test.ts
@@ -0,0 +1,7 @@
+import { FieldValue } from './field-value';
+
+export class Test extends FieldValue {
+ constructor(field: string, value: number) {
+ super('match', 'test', field, value);
+ }
+}
diff --git a/llparse-builder/src/code/update.ts b/llparse-builder/src/code/update.ts
new file mode 100644
index 0000000..de62476
--- /dev/null
+++ b/llparse-builder/src/code/update.ts
@@ -0,0 +1,7 @@
+import { FieldValue } from './field-value';
+
+export class Update extends FieldValue {
+ constructor(field: string, value: number) {
+ super('match', 'update', field, value);
+ }
+}
diff --git a/llparse-builder/src/code/value.ts b/llparse-builder/src/code/value.ts
new file mode 100644
index 0000000..06c6fd7
--- /dev/null
+++ b/llparse-builder/src/code/value.ts
@@ -0,0 +1,7 @@
+import { Code } from './base';
+
+export class Value extends Code {
+ constructor(name: string) {
+ super('value', name);
+ }
+}
diff --git a/llparse-builder/src/edge.ts b/llparse-builder/src/edge.ts
new file mode 100644
index 0000000..f6b55cc
--- /dev/null
+++ b/llparse-builder/src/edge.ts
@@ -0,0 +1,54 @@
+import * as assert from 'assert';
+
+import { Buffer } from 'buffer';
+import { Invoke, Node } from './node';
+
+/**
+ * This class represents an edge in the parser graph.
+ */
+export class Edge {
+ /**
+ * Comparator for `.sort()` function.
+ */
+ public static compare(a: Edge, b: Edge): number {
+ if (typeof a.key === 'number') {
+ return a.key - (b.key as number);
+ }
+ return a.key!.compare(b.key as Buffer);
+ }
+
+ /**
+ * @param node Edge target
+ * @param noAdvance If `true` - the parent should not consume bytes before
+ * moving to the target `node`
+ * @param key `Buffer` for `node.Match`, `number` for `node.Invoke`,
+ * `undefined` for edges created with `.otherwise()`
+ * @param value `.select()` value associated with the edge
+ */
+ constructor(public readonly node: Node,
+ public readonly noAdvance: boolean,
+ public readonly key: Buffer | number | undefined,
+ public readonly value: number | undefined) {
+ if (node instanceof Invoke) {
+ if (value === undefined) {
+ assert.strictEqual(node.code.signature, 'match',
+ 'Invalid Invoke\'s code signature');
+ } else {
+ assert.strictEqual(node.code.signature, 'value',
+ 'Invalid Invoke\'s code signature');
+ }
+ } else {
+ assert.strictEqual(value, undefined,
+ 'Attempting to pass value to non-Invoke node');
+ }
+
+ if (Buffer.isBuffer(key)) {
+ assert(key.length > 0, 'Invalid edge buffer length');
+
+ if (noAdvance) {
+ assert.strictEqual(key.length, 1,
+ 'Only 1-char keys are allowed in `noAdvance` edges');
+ }
+ }
+ }
+}
diff --git a/llparse-builder/src/loop-checker/index.ts b/llparse-builder/src/loop-checker/index.ts
new file mode 100644
index 0000000..5751955
--- /dev/null
+++ b/llparse-builder/src/loop-checker/index.ts
@@ -0,0 +1,205 @@
+import * as assert from 'assert';
+import * as debugAPI from 'debug';
+
+import { Node } from '../node';
+import { Reachability } from '../reachability';
+import { Lattice } from './lattice';
+
+const debug = debugAPI('llparse-builder:loop-checker');
+
+const EMPTY_VALUE = new Lattice('empty');
+const ANY_VALUE = new Lattice('any');
+
+/**
+ * This class implements a loop checker pass. The goal of this pass is to verify
+ * that the graph doesn't contain infinite loops.
+ */
+export class LoopChecker {
+ private readonly lattice: Map<Node, Lattice> = new Map();
+
+ // Just a cache of terminated keys
+ private readonly terminatedCache: Map<Node, Lattice> = new Map();
+
+ /**
+ * Run loop checker pass on a graph starting from `root`.
+ *
+ * Throws on failure.
+ *
+ * @param root Graph root node
+ */
+ public check(root: Node): void {
+ const r = new Reachability();
+
+ const nodes = r.build(root);
+
+ for (const node of nodes) {
+ debug('checking loops starting from %j', node.name);
+
+ // Set initial lattice value for all nodes
+ this.clear(nodes);
+
+ // Mark root as reachable with any value
+ this.lattice.set(node, ANY_VALUE);
+
+ // Raise lattice values
+ let changed: Set<Node> = new Set([ root ]);
+ while (changed.size !== 0) {
+ if (debug.enabled) {
+ debug('changed %j', Array.from(changed).map((other) => other.name));
+ }
+
+ const next: Set<Node> = new Set();
+ for (const changedNode of changed) {
+ this.propagate(changedNode, next);
+ }
+ changed = next;
+ }
+
+ debug('lattice stabilized');
+
+ // Visit nodes and walk through reachable edges to detect loops
+ this.visit(node, []);
+ }
+ }
+
+ private clear(nodes: ReadonlyArray<Node>): void {
+ for (const node of nodes) {
+ this.lattice.set(node, EMPTY_VALUE);
+ }
+ }
+
+ private propagate(node: Node, changed: Set<Node>): void {
+ let value: Lattice = this.lattice.get(node)!;
+ debug('propagate(%j), initial value %j', node.name, value);
+
+ // Terminate values that are consumed by `match`/`select`
+ const terminated = this.terminate(node, value, changed);
+ if (!terminated.isEqual(EMPTY_VALUE)) {
+ debug('node %j terminates %j', node.name, terminated);
+ value = value.subtract(terminated);
+ if (value.isEqual(EMPTY_VALUE)) {
+ return;
+ }
+ }
+
+ const keysByTarget: Map<Node, Lattice> = new Map();
+ // Propagate value through `.peek()`/`.otherwise()` edges
+ for (const edge of node.getAllEdges()) {
+ if (!edge.noAdvance) {
+ continue;
+ }
+
+ let targetValue: Lattice;
+ if (keysByTarget.has(edge.node)) {
+ targetValue = keysByTarget.get(edge.node)!;
+ } else {
+ targetValue = this.lattice.get(edge.node)!;
+ }
+
+ // `otherwise` or `Invoke`'s edges
+ if (edge.key === undefined || typeof edge.key === 'number') {
+ targetValue = targetValue.union(value);
+ } else {
+ // `.peek()`
+ const edgeValue = new Lattice([ edge.key[0] ]).intersect(value);
+ if (edgeValue.isEqual(EMPTY_VALUE)) {
+ continue;
+ }
+
+ targetValue = targetValue.union(edgeValue);
+ }
+
+ keysByTarget.set(edge.node, targetValue);
+ }
+
+ for (const [ child, childValue ] of keysByTarget) {
+ debug('node %j propagates %j to %j', node.name, childValue,
+ child.name);
+ this.update(child, childValue, changed);
+ }
+ }
+
+ private update(node: Node, newValue: Lattice, changed: Set<Node>): boolean {
+ const value = this.lattice.get(node)!;
+ if (newValue.isEqual(value)) {
+ return false;
+ }
+
+ this.lattice.set(node, newValue);
+ changed.add(node);
+ return true;
+ }
+
+ private terminate(node: Node, value: Lattice, changed: Set<Node>): Lattice {
+ if (this.terminatedCache.has(node)) {
+ return this.terminatedCache.get(node)!;
+ }
+
+ const terminated: number[] = [];
+ for (const edge of node.getAllEdges()) {
+ if (edge.noAdvance) {
+ continue;
+ }
+
+ // Ignore `otherwise` and `Invoke`'s edges
+ if (edge.key === undefined || typeof edge.key === 'number') {
+ continue;
+ }
+
+ terminated.push(edge.key[0]);
+ }
+
+ const result = new Lattice(terminated);
+ this.terminatedCache.set(node, result);
+ return result;
+ }
+
+ private visit(node: Node, path: ReadonlyArray<Node>): void {
+ let value = this.lattice.get(node)!;
+ debug('enter %j, value is %j', node.name, value);
+
+ const terminated = this.terminatedCache.has(node) ?
+ this.terminatedCache.get(node)! : EMPTY_VALUE;
+ if (!terminated.isEqual(EMPTY_VALUE)) {
+ debug('subtract terminated %j', terminated);
+ value = value.subtract(terminated);
+ if (value.isEqual(EMPTY_VALUE)) {
+ debug('terminated everything');
+ return;
+ }
+ }
+
+ for (const edge of node.getAllEdges()) {
+ if (!edge.noAdvance) {
+ continue;
+ }
+
+ let edgeValue = value;
+
+ // `otherwise` or `Invoke`'s edges
+ if (edge.key === undefined || typeof edge.key === 'number') {
+ // nothing to do
+ // `.peek()`
+ } else {
+ edgeValue = edgeValue.intersect(new Lattice([ edge.key[0] ]));
+ }
+
+ // Ignore unreachable edges
+ if (edgeValue.isEqual(EMPTY_VALUE)) {
+ continue;
+ }
+ if (path.indexOf(edge.node) !== -1) {
+ if (path.length === 0) {
+ throw new Error(
+ `Detected loop in "${edge.node.name}" through "${edge.node.name}"`);
+ }
+ throw new Error(
+ `Detected loop in "${edge.node.name}" through chain ` +
+ `${path.map((parent) => '"' + parent.name + '"').join(' -> ')}`);
+ }
+ this.visit(edge.node, path.concat(edge.node));
+ }
+
+ debug('leave %j', node.name);
+ }
+}
diff --git a/llparse-builder/src/loop-checker/lattice.ts b/llparse-builder/src/loop-checker/lattice.ts
new file mode 100644
index 0000000..8d2a7fe
--- /dev/null
+++ b/llparse-builder/src/loop-checker/lattice.ts
@@ -0,0 +1,115 @@
+import * as assert from 'assert';
+
+const MAX_VALUE = 256;
+const WORD_SIZE = 32;
+const SIZE = (MAX_VALUE / WORD_SIZE) | 0;
+const WORD_FILL = -1 | 0;
+
+assert.strictEqual(MAX_VALUE % WORD_SIZE, 0);
+
+export type LatticeValue = 'empty' | ReadonlyArray<number> | 'any';
+
+/**
+ * A fixed-size bitfield, really
+ */
+export class Lattice {
+ protected readonly words: number[];
+
+ constructor(value: LatticeValue) {
+ this.words = new Array(SIZE).fill(value === 'any' ? WORD_FILL : 0);
+
+ if (Array.isArray(value)) {
+ for (const single of value) {
+ this.add(single);
+ }
+ }
+ }
+
+ public check(bit: number): boolean {
+ assert(0 <= bit && bit < MAX_VALUE, 'Invalid bit');
+ const index = (bit / WORD_SIZE) | 0;
+ const off = bit % WORD_SIZE;
+ return (this.words[index] & (1 << off)) !== 0;
+ }
+
+ public union(other: Lattice): Lattice {
+ const result = new Lattice('empty');
+
+ for (let i = 0; i < SIZE; i++) {
+ result.words[i] = this.words[i] | other.words[i];
+ }
+
+ return result;
+ }
+
+ public intersect(other: Lattice): Lattice {
+ const result = new Lattice('empty');
+
+ for (let i = 0; i < SIZE; i++) {
+ result.words[i] = this.words[i] & other.words[i];
+ }
+
+ return result;
+ }
+
+ public subtract(other: Lattice): Lattice {
+ const result = new Lattice('empty');
+
+ for (let i = 0; i < SIZE; i++) {
+ result.words[i] = this.words[i] & (~other.words[i]);
+ }
+
+ return result;
+ }
+
+ public isEqual(other: Lattice): boolean {
+ if (this === other) {
+ return true;
+ }
+
+ for (let i = 0; i < SIZE; i++) {
+ if (this.words[i] !== other.words[i]) {
+ return false;
+ }
+ }
+ return true;
+ }
+
+ public *[Symbol.iterator](): Iterator<number> {
+ // TODO(indutny): improve speed if needed
+ for (let i = 0; i < MAX_VALUE; i++) {
+ if (this.check(i)) {
+ yield i;
+ }
+ }
+ }
+
+ public toJSON(): any {
+ let isEmpty = true;
+ let isFull = true;
+ for (let i = 0; i < SIZE; i++) {
+ if (this.words[i] !== 0) {
+ isEmpty = false;
+ }
+ if (this.words[i] !== WORD_FILL) {
+ isFull = false;
+ }
+ }
+ if (isEmpty) {
+ return 'empty';
+ }
+ if (isFull) {
+ return 'any';
+ }
+ return Array.from(this);
+ }
+
+ // Private
+
+ private add(bit: number): void {
+ assert(0 <= bit && bit < MAX_VALUE, 'Invalid bit');
+ const index = (bit / WORD_SIZE) | 0;
+ const off = bit % WORD_SIZE;
+ this.words[index] |= 1 << off;
+ }
+}
diff --git a/llparse-builder/src/node/base.ts b/llparse-builder/src/node/base.ts
new file mode 100644
index 0000000..9840f16
--- /dev/null
+++ b/llparse-builder/src/node/base.ts
@@ -0,0 +1,96 @@
+import * as assert from 'assert';
+import binarySearch = require('binary-search');
+import { Edge } from '../edge';
+
+/**
+ * Base class for all graph nodes.
+ */
+export abstract class Node {
+ private otherwiseEdge: Edge | undefined;
+ private privEdges: Edge[] = [];
+
+ /**
+ * @param name Node name
+ */
+ constructor(public readonly name: string) {
+ // no-op
+ }
+
+ /**
+ * Create an otherwise edge to node `node`.
+ *
+ * This edge is executed when no other edges match current input. No
+ * characters are consumed upon transition.
+ *
+ * NOTE: At most one otherwise (skipping or not) edge can be set, most nodes
+ * except `Error` require it.
+ *
+ * @param node Target node
+ */
+ public otherwise(node: Node): this {
+ if (this.otherwiseEdge !== undefined) {
+ throw new Error('Node already has `otherwise` or `skipTo`');
+ }
+
+ this.otherwiseEdge = new Edge(node, true, undefined, undefined);
+ return this;
+ }
+
+ /**
+ * Create a skipping otherwise edge to node `node`.
+ *
+ * This edge is executed when no other edges match current input. Single
+ * character is consumed upon transition.
+ *
+ * NOTE: At most one otherwise (skipping or not) edge can be set, most nodes
+ * except `Error` require it.
+ *
+ * @param node Target node
+ */
+ public skipTo(node: Node): this {
+ if (this.otherwiseEdge !== undefined) {
+ throw new Error('Node already has `otherwise` or `skipTo`');
+ }
+
+ this.otherwiseEdge = new Edge(node, false, undefined, undefined);
+ return this;
+ }
+
+ // Limited public use
+
+ /** Get otherwise edge. */
+ public getOtherwiseEdge(): Edge | undefined {
+ return this.otherwiseEdge;
+ }
+
+ /** Get list of all non-otherwise edges. */
+ public getEdges(): ReadonlyArray<Edge> {
+ return this.privEdges;
+ }
+
+ /** Get list of all edges (including otherwise, if present). */
+ public getAllEdges(): ReadonlyArray<Edge> {
+ const res = this.privEdges;
+ if (this.otherwiseEdge === undefined) {
+ return res;
+ } else {
+ return res.concat(this.otherwiseEdge);
+ }
+ }
+
+ /** Get iterator through all non-otherwise edges. */
+ public *[Symbol.iterator](): Iterator<Edge> {
+ yield* this.privEdges;
+ }
+
+ // Internal
+
+ protected addEdge(edge: Edge): void {
+ assert.notStrictEqual(edge.key, undefined);
+
+ const index = binarySearch(this.privEdges, edge, Edge.compare);
+ assert(index < 0, 'Attempting to create duplicate edge');
+
+ this.privEdges.splice(-1 - index, 0, edge);
+ }
+}
diff --git a/llparse-builder/src/node/consume.ts b/llparse-builder/src/node/consume.ts
new file mode 100644
index 0000000..eff4037
--- /dev/null
+++ b/llparse-builder/src/node/consume.ts
@@ -0,0 +1,19 @@
+import * as assert from 'assert';
+import { Node } from './base';
+
+/**
+ * This node consumes number of characters specified by state's property with
+ * name `field` from the input, and forwards execution to `otherwise` node.
+ */
+export class Consume extends Node {
+ /**
+ * @param field State's property name
+ */
+ constructor(public readonly field: string) {
+ super('consume_' + field);
+
+ if (/^_/.test(field)) {
+ throw new Error(`Can't use internal field in \`consume()\`: "${field}"`);
+ }
+ }
+}
diff --git a/llparse-builder/src/node/error.ts b/llparse-builder/src/node/error.ts
new file mode 100644
index 0000000..393f566
--- /dev/null
+++ b/llparse-builder/src/node/error.ts
@@ -0,0 +1,24 @@
+import * as assert from 'assert';
+import { Node } from './base';
+
+/**
+ * This node terminates the execution with an error
+ */
+class NodeError extends Node {
+ /**
+ * @param code Error code to return to user
+ * @param reason Error description to store in parser's state
+ */
+ constructor(public readonly code: number, public readonly reason: string) {
+ super('error');
+ assert.strictEqual(code, code | 0, 'code must be integer');
+ }
+
+ /** `.otherwise()` is not supported on this type of node */
+ public otherwise(node: Node): this { throw new Error('Not supported'); }
+
+ /** `.skipTo()` is not supported on this type of node */
+ public skipTo(node: Node): this { throw new Error('Not supported'); }
+}
+
+export { NodeError as Error };
diff --git a/llparse-builder/src/node/index.ts b/llparse-builder/src/node/index.ts
new file mode 100644
index 0000000..e3d5fe5
--- /dev/null
+++ b/llparse-builder/src/node/index.ts
@@ -0,0 +1,8 @@
+export { Node } from './base';
+export { Consume } from './consume';
+export { Error } from './error';
+export { Invoke, IInvokeMap } from './invoke';
+export { Match } from './match';
+export { Pause } from './pause';
+export { SpanStart } from './span-start';
+export { SpanEnd } from './span-end';
diff --git a/llparse-builder/src/node/invoke.ts b/llparse-builder/src/node/invoke.ts
new file mode 100644
index 0000000..d6791a7
--- /dev/null
+++ b/llparse-builder/src/node/invoke.ts
@@ -0,0 +1,39 @@
+import * as assert from 'assert';
+
+import { Code } from '../code';
+import { Edge } from '../edge';
+import { Node } from './base';
+
+/**
+ * Map of return codes of the callback. Each key is a return code,
+ * value is the target node that must be executed upon getting such return code.
+ */
+export interface IInvokeMap {
+ readonly [key: number]: Node;
+}
+
+/**
+ * This node invokes either external callback or intrinsic code and passes the
+ * execution to either a target from a `map` (if the return code matches one of
+ * registered in it), or to `otherwise` node.
+ */
+export class Invoke extends Node {
+ /**
+ * @param code External callback or intrinsic code. Can be created with
+ * `builder.code.*()` methods.
+ * @param map Map from callback return codes to target nodes
+ */
+ constructor(public readonly code: Code, map: IInvokeMap) {
+ super('invoke_' + code.name);
+
+ Object.keys(map).forEach((mapKey) => {
+ const numKey: number = parseInt(mapKey, 10);
+ const targetNode = map[numKey]!;
+
+ assert.strictEqual(numKey, numKey | 0,
+ 'Invoke\'s map keys must be integers');
+
+ this.addEdge(new Edge(targetNode, true, numKey, undefined));
+ });
+ }
+}
diff --git a/llparse-builder/src/node/match.ts b/llparse-builder/src/node/match.ts
new file mode 100644
index 0000000..617a659
--- /dev/null
+++ b/llparse-builder/src/node/match.ts
@@ -0,0 +1,162 @@
+import * as assert from 'assert';
+import { Buffer } from 'buffer';
+
+import { Edge } from '../edge';
+import { Transform } from '../transform';
+import { toBuffer } from '../utils';
+import { Node } from './base';
+
+/**
+ * Character/sequence to match.
+ *
+ * May have following types:
+ *
+ * * `number` - for single character
+ * * `string` - for printable character sequence
+ * * `Buffer` - for raw byte sequence
+ */
+export type MatchSingleValue = string | number | Buffer;
+
+/**
+ * Convenience type for passing several characters/sequences to match methods.
+ */
+export type MatchValue = MatchSingleValue | ReadonlyArray<MatchSingleValue>;
+
+/**
+ * A map from characters/sequences to `.select()`'s values. Used for specifying
+ * the value to be passed to `.select()'`s targets.
+ */
+export interface IMatchSelect {
+ readonly [key: string]: number;
+}
+
+/**
+ * This node matches characters/sequences and forwards the execution according
+ * to matched character with optional attached value (See `.select()`).
+ */
+export class Match extends Node {
+ private transformFn: Transform | undefined;
+
+ /**
+ * Set character transformation function.
+ *
+ * @param transform Transformation to apply. Can be created with
+ * `builder.transform.*()` methods.
+ */
+ public transform(transformFn: Transform): this {
+ this.transformFn = transformFn;
+ return this;
+ }
+
+ /**
+ * Match sequence/character and forward execution to `next` on success,
+ * consuming matched bytes of the input.
+ *
+ * No value is attached on such execution forwarding, and the target node
+ * **must not** be an `Invoke` node with a callback expecting the value.
+ *
+ * @param value Sequence/character to be matched
+ * @param next Target node to be executed on success.
+ */
+ public match(value: MatchValue, next: Node): this {
+ if (Array.isArray(value)) {
+ for (const subvalue of value) {
+ this.match(subvalue, next);
+ }
+ return this;
+ }
+
+ const buffer = toBuffer(value as MatchSingleValue);
+ const edge = new Edge(next, false, buffer, undefined);
+ this.addEdge(edge);
+ return this;
+ }
+
+ /**
+ * Match character and forward execution to `next` on success
+ * without consuming one byte of the input.
+ *
+ * No value is attached on such execution forwarding, and the target node
+ * **must not** be an `Invoke` with a callback expecting the value.
+ *
+ * @param value Character to be matched
+ * @param next Target node to be executed on success.
+ */
+ public peek(value: MatchValue, next: Node): this {
+ if (Array.isArray(value)) {
+ for (const subvalue of value) {
+ this.peek(subvalue, next);
+ }
+ return this;
+ }
+
+ const buffer = toBuffer(value as MatchSingleValue);
+ assert.strictEqual(buffer.length, 1,
+ '`.peek()` accepts only single character keys');
+
+ const edge = new Edge(next, true, buffer, undefined);
+ this.addEdge(edge);
+ return this;
+ }
+
+ /**
+ * Match character/sequence and forward execution to `next` on success
+ * consumed matched bytes of the input.
+ *
+ * Value is attached on such execution forwarding, and the target node
+ * **must** be an `Invoke` with a callback expecting the value.
+ *
+ * Possible signatures:
+ *
+ * * `.select(key, value [, next ])`
+ * * `.select({ key: value } [, next])`
+ *
+ * @param keyOrMap Either a sequence to match, or a map from sequences to
+ * values
+ * @param valueOrNext Either an integer value to be forwarded to the target
+ * node, or an otherwise node
+ * @param next Convenience param. Same as calling `.otherwise(...)`
+ */
+ public select(keyOrMap: MatchSingleValue | IMatchSelect,
+ valueOrNext?: number | Node, next?: Node): this {
+ // .select({ key: value, ... }, next)
+ if (typeof keyOrMap === 'object') {
+ assert(valueOrNext instanceof Node,
+ 'Invalid `next` argument of `.select()`');
+ assert.strictEqual(next, undefined,
+ 'Invalid argument count of `.select()`');
+
+ const map: IMatchSelect = keyOrMap as IMatchSelect;
+ next = valueOrNext as Node | undefined;
+
+ Object.keys(map).forEach((mapKey) => {
+ const numKey: number = mapKey as any;
+
+ this.select(numKey, map[numKey]!, next);
+ });
+ return this;
+ }
+
+ // .select(key, value, next)
+ assert.strictEqual(typeof valueOrNext, 'number',
+ 'Invalid `value` argument of `.select()`');
+ assert.notStrictEqual(next, undefined,
+ 'Invalid `next` argument of `.select()`');
+
+ const key = toBuffer(keyOrMap as MatchSingleValue);
+ const value = valueOrNext as number;
+
+ const edge = new Edge(next!, false, key, value);
+ this.addEdge(edge);
+ return this;
+ }
+
+ // Limited public use
+
+ /**
+ * Get tranformation function
+ */
+ public getTransform(): Transform | undefined {
+ return this.transformFn;
+ }
+}
diff --git a/llparse-builder/src/node/pause.ts b/llparse-builder/src/node/pause.ts
new file mode 100644
index 0000000..2dcf5d1
--- /dev/null
+++ b/llparse-builder/src/node/pause.ts
@@ -0,0 +1,25 @@
+import * as assert from 'assert';
+import { Node } from './base';
+
+/**
+ * This returns the specified error code, but makes the resumption to
+ * `otherwise` target possible.
+ */
+export class Pause extends Node {
+ /**
+ * @param code Error code to return
+ * @param reason Error description
+ */
+ constructor(public readonly code: number, public readonly reason: string) {
+ super('pause');
+ assert.strictEqual(code, code | 0, 'code must be integer');
+ }
+
+ /**
+ * `.skipTo()` is not supported on this type of node, please use
+ * `.otherwise()`
+ */
+ public skipTo(node: Node): this {
+ throw new Error('Not supported, please use `pause.otherwise()`');
+ }
+}
diff --git a/llparse-builder/src/node/span-end.ts b/llparse-builder/src/node/span-end.ts
new file mode 100644
index 0000000..377cd73
--- /dev/null
+++ b/llparse-builder/src/node/span-end.ts
@@ -0,0 +1,19 @@
+import { Span } from '../span';
+import { Node } from './base';
+
+/**
+ * Indicates span end.
+ *
+ * A callback will be invoked with all input data since the most recent of:
+ *
+ * * Span start invocation
+ * * Parser execution
+ */
+export class SpanEnd extends Node {
+ /**
+ * @param span Span instance
+ */
+ constructor(public readonly span: Span) {
+ super(`span_end_${span.callback.name}`);
+ }
+}
diff --git a/llparse-builder/src/node/span-start.ts b/llparse-builder/src/node/span-start.ts
new file mode 100644
index 0000000..f81b432
--- /dev/null
+++ b/llparse-builder/src/node/span-start.ts
@@ -0,0 +1,16 @@
+import { Span } from '../span';
+import { Node } from './base';
+
+/**
+ * Indicates span start.
+ *
+ * See `SpanEnd` for details on callback invocation.
+ */
+export class SpanStart extends Node {
+ /**
+ * @param span Span instance
+ */
+ constructor(public readonly span: Span) {
+ super(`span_start_${span.callback.name}`);
+ }
+}
diff --git a/llparse-builder/src/property.ts b/llparse-builder/src/property.ts
new file mode 100644
index 0000000..cf2fe4b
--- /dev/null
+++ b/llparse-builder/src/property.ts
@@ -0,0 +1,12 @@
+export type PropertyType = 'i8' | 'i16' | 'i32' | 'i64' | 'ptr';
+
+/**
+ * Class describing allocated property in parser's state
+ */
+export class Property {
+ constructor(public readonly ty: PropertyType, public readonly name: string) {
+ if (/^_/.test(name)) {
+ throw new Error(`Can't use internal property name: "${name}"`);
+ }
+ }
+}
diff --git a/llparse-builder/src/reachability.ts b/llparse-builder/src/reachability.ts
new file mode 100644
index 0000000..88bcd65
--- /dev/null
+++ b/llparse-builder/src/reachability.ts
@@ -0,0 +1,31 @@
+import { Node } from './node';
+
+/**
+ * This class finds all reachable nodes
+ */
+export class Reachability {
+ /**
+ * Build and return list of reachable nodes.
+ */
+ public build(root: Node): ReadonlyArray<Node> {
+ const res = new Set();
+ const queue = [ root ];
+ while (queue.length !== 0) {
+ const node = queue.pop()!;
+ if (res.has(node)) {
+ continue;
+ }
+ res.add(node);
+
+ for (const edge of node) {
+ queue.push(edge.node);
+ }
+
+ const otherwise = node.getOtherwiseEdge();
+ if (otherwise !== undefined) {
+ queue.push(otherwise.node);
+ }
+ }
+ return Array.from(res) as ReadonlyArray<Node>;
+ }
+}
diff --git a/llparse-builder/src/span-allocator.ts b/llparse-builder/src/span-allocator.ts
new file mode 100644
index 0000000..b3e8f6b
--- /dev/null
+++ b/llparse-builder/src/span-allocator.ts
@@ -0,0 +1,182 @@
+import * as assert from 'assert';
+import * as debugAPI from 'debug';
+
+import { Node, SpanEnd, SpanStart } from './node';
+import { Reachability } from './reachability';
+import { Span } from './span';
+
+const debug = debugAPI('llparse-builder:span-allocator');
+
+type SpanSet = Set<Span>;
+
+interface ISpanActiveInfo {
+ readonly active: Map<Node, SpanSet>;
+ readonly spans: ReadonlyArray<Span>;
+}
+
+type SpanOverlap = Map<Span, SpanSet>;
+
+export interface ISpanAllocatorResult {
+ readonly colors: ReadonlyMap<Span, number>;
+ readonly concurrency: ReadonlyArray<ReadonlyArray<Span> >;
+ readonly max: number;
+}
+
+function id(node: SpanStart | SpanEnd): Span {
+ return node.span;
+}
+
+export class SpanAllocator {
+ public allocate(root: Node): ISpanAllocatorResult {
+ const r = new Reachability();
+ const nodes = r.build(root);
+ const info = this.computeActive(nodes);
+ this.check(info);
+ const overlap = this.computeOverlap(info);
+ return this.color(info.spans, overlap);
+ }
+
+ private computeActive(nodes: ReadonlyArray<Node>): ISpanActiveInfo {
+ const activeMap: Map<Node, SpanSet> = new Map();
+ nodes.forEach((node) => activeMap.set(node, new Set()));
+
+ const queue: Set<Node> = new Set(nodes);
+ const spans: SpanSet = new Set();
+ for (const node of queue) {
+ queue.delete(node);
+
+ const active = activeMap.get(node)!;
+
+ if (node instanceof SpanStart) {
+ const span = id(node);
+ spans.add(span);
+ active.add(span);
+ }
+
+ active.forEach((span) => {
+ // Don't propagate span past the spanEnd
+ if (node instanceof SpanEnd && span === id(node)) {
+ return;
+ }
+
+ node.getAllEdges().forEach((edge) => {
+ const edgeNode = edge.node;
+
+ // Disallow loops
+ if (edgeNode instanceof SpanStart) {
+ assert.notStrictEqual(id(edgeNode), span,
+ `Detected loop in span "${span.callback.name}", started ` +
+ `at "${node.name}"`);
+ }
+
+ const edgeActive = activeMap.get(edgeNode)!;
+ if (edgeActive.has(span)) {
+ return;
+ }
+
+ edgeActive.add(span);
+ queue.add(edgeNode);
+ });
+ });
+ }
+
+ return { active: activeMap, spans: Array.from(spans) };
+ }
+
+ private check(info: ISpanActiveInfo): void {
+ debug('check start');
+ for (const [ node, spans ] of info.active) {
+ for (const edge of node.getAllEdges()) {
+ if (edge.node instanceof SpanStart) {
+ continue;
+ }
+
+ // Skip terminal nodes
+ if (edge.node.getAllEdges().length === 0) {
+ continue;
+ }
+
+ debug('checking edge from %j to %j', node.name, edge.node.name);
+
+ const edgeSpans = info.active.get(edge.node)!;
+ for (const subSpan of edgeSpans) {
+ assert(spans.has(subSpan),
+ `Unmatched span end for "${subSpan.callback.name}" ` +
+ `at "${edge.node.name}", coming from "${node.name}"`);
+ }
+
+ if (edge.node instanceof SpanEnd) {
+ const span = id(edge.node);
+ assert(spans.has(span),
+ `Unmatched span end for "${span.callback.name}"`);
+ }
+ }
+ }
+ }
+
+ private computeOverlap(info: ISpanActiveInfo): SpanOverlap {
+ const active = info.active;
+ const overlap: SpanOverlap = new Map();
+
+ info.spans.forEach((span) => overlap.set(span, new Set()));
+
+ active.forEach((spans) => {
+ spans.forEach((one) => {
+ const set = overlap.get(one)!;
+ spans.forEach((other) => {
+ if (other !== one) {
+ set.add(other);
+ }
+ });
+ });
+ });
+
+ return overlap;
+ }
+
+ private color(spans: ReadonlyArray<Span>, overlapMap: SpanOverlap)
+ : ISpanAllocatorResult {
+ let max = -1;
+ const colors: Map<Span, number> = new Map();
+
+ const allocate = (span: Span): number => {
+ if (colors.has(span)) {
+ return colors.get(span)!;
+ }
+
+ const overlap = overlapMap.get(span)!;
+
+ // See which colors are already used
+ const used: Set<number> = new Set();
+ for (const subSpan of overlap) {
+ if (colors.has(subSpan)) {
+ used.add(colors.get(subSpan)!);
+ }
+ }
+
+ // Find minimum available color
+ let i;
+ for (i = 0; used.has(i); i++) {
+ // no-op
+ }
+
+ max = Math.max(max, i);
+ colors.set(span, i);
+
+ return i;
+ };
+
+ const map: Map<Span, number> = new Map();
+
+ spans.forEach((span) => map.set(span, allocate(span)));
+
+ const concurrency: Span[][] = new Array(max + 1);
+ for (let i = 0; i < concurrency.length; i++) {
+ concurrency[i] = [];
+ }
+
+ spans.forEach((span) => concurrency[allocate(span)].push(span));
+
+ return { colors: map, concurrency, max };
+ }
+}
diff --git a/llparse-builder/src/span.ts b/llparse-builder/src/span.ts
new file mode 100644
index 0000000..99cafb0
--- /dev/null
+++ b/llparse-builder/src/span.ts
@@ -0,0 +1,57 @@
+import * as assert from 'assert';
+
+import { Span as SpanCallback } from './code';
+import { Node, SpanEnd, SpanStart } from './node';
+
+/**
+ * Spans are used for notifying parser user about matched data. Each byte after
+ * span start will be sent to the span callback until span end is called.
+ */
+export class Span {
+ private readonly startCache: Map<Node, SpanStart> = new Map();
+ private readonly endCache: Map<Node, SpanEnd> = new Map();
+
+ /**
+ * @param callback External callback, must be `code.span(...)` result.
+ */
+ constructor(public readonly callback: SpanCallback) {
+ }
+
+ /**
+ * Create `SpanStart` that indicates the start of the span.
+ *
+ * @param otherwise Optional convenience value. Same as calling
+ * `span.start().otherwise(...)`
+ */
+ public start(otherwise?: Node) {
+ if (otherwise !== undefined && this.startCache.has(otherwise)) {
+ return this.startCache.get(otherwise)!;
+ }
+
+ const res = new SpanStart(this);
+ if (otherwise !== undefined) {
+ res.otherwise(otherwise);
+ this.startCache.set(otherwise, res);
+ }
+ return res;
+ }
+
+ /**
+ * Create `SpanEnd` that indicates the end of the span.
+ *
+ * @param otherwise Optional convenience value. Same as calling
+ * `span.end().otherwise(...)`
+ */
+ public end(otherwise?: Node) {
+ if (otherwise !== undefined && this.endCache.has(otherwise)) {
+ return this.endCache.get(otherwise)!;
+ }
+
+ const res = new SpanEnd(this);
+ if (otherwise !== undefined) {
+ res.otherwise(otherwise);
+ this.endCache.set(otherwise, res);
+ }
+ return res;
+ }
+}
diff --git a/llparse-builder/src/transform/base.ts b/llparse-builder/src/transform/base.ts
new file mode 100644
index 0000000..902199c
--- /dev/null
+++ b/llparse-builder/src/transform/base.ts
@@ -0,0 +1,12 @@
+export type TransformName = 'to_lower_unsafe' | 'to_lower';
+
+/**
+ * Character transformation.
+ */
+export abstract class Transform {
+ /**
+ * @param name Transform name
+ */
+ constructor(public readonly name: TransformName) {
+ }
+}
diff --git a/llparse-builder/src/transform/creator.ts b/llparse-builder/src/transform/creator.ts
new file mode 100644
index 0000000..eaf3d5c
--- /dev/null
+++ b/llparse-builder/src/transform/creator.ts
@@ -0,0 +1,28 @@
+import { Transform } from './base';
+import { ToLower } from './to-lower';
+import { ToLowerUnsafe } from './to-lower-unsafe';
+
+/**
+ * API for creating character transformations.
+ *
+ * The results of methods of this class can be used as an argument to:
+ * `p.node().transform(...)`.
+ */
+export class Creator {
+ /**
+ * Unsafe transform to lowercase.
+ *
+ * The operation of this transformation is equivalent to:
+ * `String.fromCharCode(input.charCodeAt(0) | 0x20)`.
+ */
+ public toLowerUnsafe(): Transform {
+ return new ToLowerUnsafe();
+ }
+
+ /**
+ * Safe transform to lowercase.
+ */
+ public toLower(): Transform {
+ return new ToLower();
+ }
+}
diff --git a/llparse-builder/src/transform/index.ts b/llparse-builder/src/transform/index.ts
new file mode 100644
index 0000000..acdcf01
--- /dev/null
+++ b/llparse-builder/src/transform/index.ts
@@ -0,0 +1,3 @@
+export { Transform } from './base';
+export { Creator } from './creator';
+export { ToLowerUnsafe } from './to-lower-unsafe';
diff --git a/llparse-builder/src/transform/to-lower-unsafe.ts b/llparse-builder/src/transform/to-lower-unsafe.ts
new file mode 100644
index 0000000..99d9618
--- /dev/null
+++ b/llparse-builder/src/transform/to-lower-unsafe.ts
@@ -0,0 +1,7 @@
+import { Transform } from './base';
+
+export class ToLowerUnsafe extends Transform {
+ constructor() {
+ super('to_lower_unsafe');
+ }
+}
diff --git a/llparse-builder/src/transform/to-lower.ts b/llparse-builder/src/transform/to-lower.ts
new file mode 100644
index 0000000..b333fce
--- /dev/null
+++ b/llparse-builder/src/transform/to-lower.ts
@@ -0,0 +1,7 @@
+import { Transform } from './base';
+
+export class ToLower extends Transform {
+ constructor() {
+ super('to_lower');
+ }
+}
diff --git a/llparse-builder/src/utils.ts b/llparse-builder/src/utils.ts
new file mode 100644
index 0000000..3521b20
--- /dev/null
+++ b/llparse-builder/src/utils.ts
@@ -0,0 +1,19 @@
+import * as assert from 'assert';
+import { Buffer } from 'buffer';
+
+/**
+ * Internal
+ */
+export function toBuffer(value: number | string | Buffer): Buffer {
+ let res: Buffer;
+ if (Buffer.isBuffer(value)) {
+ res = value;
+ } else if (typeof value === 'string') {
+ res = Buffer.from(value);
+ } else {
+ assert(0 <= value && value <= 0xff, 'Invalid byte value');
+ res = Buffer.from([ value ]);
+ }
+ assert(res.length >= 1, 'Invalid key length');
+ return res;
+}
diff --git a/llparse-builder/test/builder-test.ts b/llparse-builder/test/builder-test.ts
new file mode 100644
index 0000000..82723ec
--- /dev/null
+++ b/llparse-builder/test/builder-test.ts
@@ -0,0 +1,94 @@
+import * as assert from 'assert';
+
+import { Builder } from '../src/builder';
+
+describe('LLParse/Builder', () => {
+ let b: Builder;
+ beforeEach(() => {
+ b = new Builder();
+ });
+
+ it('should build primitive graph', () => {
+ const start = b.node('start');
+ const end = b.node('end');
+
+ start
+ .peek('e', end)
+ .match('a', start)
+ .otherwise(b.error(1, 'error'));
+
+ end
+ .skipTo(start);
+
+ const edges = start.getEdges();
+ assert.strictEqual(edges.length, 2);
+
+ assert(!edges[0].noAdvance);
+ assert.strictEqual(edges[0].node, start);
+
+ assert(edges[1].noAdvance);
+ assert.strictEqual(edges[1].node, end);
+ });
+
+ it('should disallow duplicate edges', () => {
+ const start = b.node('start');
+
+ start.peek('e', start);
+
+ assert.throws(() => {
+ start.peek('e', start);
+ }, /duplicate edge/);
+ });
+
+ it('should disallow select to non-invoke', () => {
+ const start = b.node('start');
+
+ assert.throws(() => {
+ start.select('a', 1, start);
+ }, /value to non-Invoke/);
+ });
+
+ it('should disallow select to match-invoke', () => {
+ const start = b.node('start');
+ const invoke = b.invoke(b.code.match('something'));
+
+ assert.throws(() => {
+ start.select('a', 1, invoke);
+ }, /Invalid.*code signature/);
+ });
+
+ it('should disallow peek to value-invoke', () => {
+ const start = b.node('start');
+ const invoke = b.invoke(b.code.value('something'));
+
+ assert.throws(() => {
+ start.peek('a', invoke);
+ }, /Invalid.*code signature/);
+ });
+
+ it('should allow select to value-invoke', () => {
+ const start = b.node('start');
+ const invoke = b.invoke(b.code.value('something'));
+
+ assert.doesNotThrow(() => {
+ start.select('a', 1, invoke);
+ });
+ });
+
+ it('should create edges for Invoke', () => {
+ const start = b.node('start');
+ const invoke = b.invoke(b.code.value('something'), {
+ '-1': start,
+ '1': start,
+ '10': start,
+ });
+
+ const edges = invoke.getEdges();
+ const keys = edges.map((edge) => edge.key!);
+ assert.deepStrictEqual(keys, [
+ -1,
+ 1,
+ 10,
+ ]);
+ });
+});
diff --git a/llparse-builder/test/loop-checker-test.ts b/llparse-builder/test/loop-checker-test.ts
new file mode 100644
index 0000000..0df6064
--- /dev/null
+++ b/llparse-builder/test/loop-checker-test.ts
@@ -0,0 +1,118 @@
+import * as assert from 'assert';
+
+import { Builder, LoopChecker } from '../src/builder';
+
+describe('LLParse/LoopChecker', () => {
+ let b: Builder;
+ let lc: LoopChecker;
+ beforeEach(() => {
+ b = new Builder();
+ lc = new LoopChecker();
+ });
+
+ it('should detect shallow loops', () => {
+ const start = b.node('start');
+
+ start
+ .otherwise(start);
+
+ assert.throws(() => {
+ lc.check(start);
+ }, /Detected loop in "start".*"start"/);
+ });
+
+ it('should detect loops', () => {
+ const start = b.node('start');
+ const a = b.node('a');
+ const invoke = b.invoke(b.code.match('nop'), {
+ 0: start,
+ }, b.error(1, 'error'));
+
+ start
+ .peek('a', a)
+ .otherwise(b.error(1, 'error'));
+
+ a.otherwise(invoke);
+
+ assert.throws(() => {
+ lc.check(start);
+ }, /Detected loop in "a".*"a" -> "invoke_nop"/);
+ });
+
+ it('should detect seemingly unreachable keys', () => {
+ const start = b.node('start');
+ const loop = b.node('loop');
+
+ start
+ .peek('a', loop)
+ .otherwise(b.error(1, 'error'));
+
+ loop
+ .match('a', loop)
+ .otherwise(loop);
+
+ assert.throws(() => {
+ lc.check(start);
+ }, /Detected loop in "loop" through.*"loop"/);
+ });
+
+ it('should ignore loops through `peek` to `match`', () => {
+ const start = b.node('start');
+ const a = b.node('a');
+ const invoke = b.invoke(b.code.match('nop'), {
+ 0: start,
+ }, b.error(1, 'error'));
+
+ start
+ .peek('a', a)
+ .otherwise(b.error(1, 'error'));
+
+ a
+ .match('abc', invoke)
+ .otherwise(start);
+
+ assert.doesNotThrow(() => lc.check(start));
+ });
+
+ it('should ignore irrelevant `peek`s', () => {
+ const start = b.node('start');
+ const a = b.node('a');
+
+ start
+ .peek('a', a)
+ .otherwise(b.error(1, 'error'));
+
+ a
+ .peek('b', start)
+ .otherwise(b.error(1, 'error'));
+
+ assert.doesNotThrow(() => lc.check(start));
+ });
+
+ it('should ignore loops with multi `peek`/`match`', () => {
+ const start = b.node('start');
+ const another = b.node('another');
+
+ const NUM: ReadonlyArray<string> = [
+ '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
+ ];
+
+ const ALPHA: ReadonlyArray<string> = [
+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
+ 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+ 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O',
+ 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
+ ];
+
+ start
+ .match(ALPHA, start)
+ .peek(NUM, another)
+ .skipTo(start);
+
+ another
+ .match(NUM, another)
+ .otherwise(start);
+
+ assert.doesNotThrow(() => lc.check(start));
+ });
+});
diff --git a/llparse-builder/test/span-allocator-test.ts b/llparse-builder/test/span-allocator-test.ts
new file mode 100644
index 0000000..bc8f656
--- /dev/null
+++ b/llparse-builder/test/span-allocator-test.ts
@@ -0,0 +1,146 @@
+import * as assert from 'assert';
+
+import { Builder, SpanAllocator } from '../src/builder';
+
+describe('LLParse/LoopChecker', () => {
+ let b: Builder;
+ let sa: SpanAllocator;
+ beforeEach(() => {
+ b = new Builder();
+ sa = new SpanAllocator();
+ });
+
+ it('should allocate single span', () => {
+ const span = b.span(b.code.span('span'));
+ const start = b.node('start');
+ const body = b.node('body');
+
+ start
+ .otherwise(span.start(body));
+
+ body
+ .skipTo(span.end(start));
+
+ const res = sa.allocate(start);
+
+ assert.strictEqual(res.max, 0);
+
+ assert.strictEqual(res.concurrency.length, 1);
+ assert.ok(res.concurrency[0].includes(span));
+
+ assert.strictEqual(res.colors.size, 1);
+ assert.strictEqual(res.colors.get(span), 0);
+ });
+
+ it('should allocate overlapping spans', () => {
+ const span1 = b.span(b.code.span('span1'));
+ const span2 = b.span(b.code.span('span2'));
+
+ const start = b.node('start');
+ const body1 = b.node('body1');
+ const body2 = b.node('body2');
+
+ start
+ .otherwise(span1.start(body1));
+
+ body1
+ .otherwise(span2.start(body2));
+
+ body2
+ .skipTo(span2.end(span1.end(start)));
+
+ const res = sa.allocate(start);
+
+ assert.strictEqual(res.max, 1);
+
+ assert.strictEqual(res.concurrency.length, 2);
+ assert.ok(res.concurrency[0].includes(span1));
+ assert.ok(res.concurrency[1].includes(span2));
+
+ assert.strictEqual(res.colors.size, 2);
+ assert.strictEqual(res.colors.get(span1), 0);
+ assert.strictEqual(res.colors.get(span2), 1);
+ });
+
+ it('should allocate non-overlapping spans', () => {
+ const span1 = b.span(b.code.span('span1'));
+ const span2 = b.span(b.code.span('span2'));
+
+ const start = b.node('start');
+ const body1 = b.node('body1');
+ const body2 = b.node('body2');
+
+ start
+ .match('a', span1.start(body1))
+ .otherwise(span2.start(body2));
+
+ body1
+ .skipTo(span1.end(start));
+
+ body2
+ .skipTo(span2.end(start));
+
+ const res = sa.allocate(start);
+
+ assert.strictEqual(res.max, 0);
+
+ assert.strictEqual(res.concurrency.length, 1);
+ assert.ok(res.concurrency[0].includes(span1));
+ assert.ok(res.concurrency[0].includes(span2));
+
+ assert.strictEqual(res.colors.size, 2);
+ assert.strictEqual(res.colors.get(span1), 0);
+ assert.strictEqual(res.colors.get(span2), 0);
+ });
+
+ it('should throw on loops', () => {
+ const span = b.span(b.code.span('span_name'));
+
+ const start = b.node('start');
+
+ start
+ .otherwise(span.start(start));
+
+ assert.throws(() => {
+ sa.allocate(start);
+ }, /loop.*span_name/);
+ });
+
+ it('should throw on unmatched ends', () => {
+ const start = b.node('start');
+ const span = b.span(b.code.span('on_data'));
+
+ start.otherwise(span.end().skipTo(start));
+
+ assert.throws(() => sa.allocate(start), /unmatched.*on_data/i);
+ });
+
+ it('should throw on branched unmatched ends', () => {
+ const start = b.node('start');
+ const end = b.node('end');
+ const span = b.span(b.code.span('on_data'));
+
+ start
+ .match('a', end)
+ .match('b', span.start(end))
+ .otherwise(b.error(1, 'error'));
+
+ end
+ .otherwise(span.end(start));
+
+ assert.throws(() => sa.allocate(start), /unmatched.*on_data/i);
+ });
+
+ it('should propagate through the Invoke map', () => {
+ const start = b.node('start');
+ const span = b.span(b.code.span('llparse__on_data'));
+
+ b.property('i8', 'custom');
+
+ start.otherwise(b.invoke(b.code.load('custom'), {
+ 0: span.end().skipTo(start),
+ }, span.end().skipTo(start)));
+
+ assert.doesNotThrow(() => sa.allocate(span.start(start)));
+ });
+});
diff --git a/llparse-builder/tsconfig.json b/llparse-builder/tsconfig.json
new file mode 100644
index 0000000..01ec7c2
--- /dev/null
+++ b/llparse-builder/tsconfig.json
@@ -0,0 +1,15 @@
+{
+ "compilerOptions": {
+ "strict": true,
+ "target": "es2017",
+ "module": "commonjs",
+ "moduleResolution": "node",
+ "outDir": "./lib",
+ "declaration": true,
+ "pretty": true,
+ "sourceMap": true
+ },
+ "include": [
+ "src/**/*.ts"
+ ]
+}
diff --git a/llparse-builder/tslint.json b/llparse-builder/tslint.json
new file mode 100644
index 0000000..b0aaf97
--- /dev/null
+++ b/llparse-builder/tslint.json
@@ -0,0 +1,14 @@
+{
+ "defaultSeverity": "error",
+ "extends": [
+ "tslint:recommended"
+ ],
+ "jsRules": {},
+ "rules": {
+ "no-bitwise": null,
+ "quotemark": [
+ true, "single", "avoid-escape", "avoid-template"
+ ]
+ },
+ "rulesDirectory": []
+}