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584 lines
20 KiB
JavaScript
584 lines
20 KiB
JavaScript
/* Copyright 2017 Mozilla Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import {
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PostScriptCompiler,
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PostScriptEvaluator,
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} from "../../src/core/function.js";
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import { PostScriptLexer, PostScriptParser } from "../../src/core/ps_parser.js";
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import { StringStream } from "../../src/core/stream.js";
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describe("function", function () {
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describe("PostScriptParser", function () {
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function parse(program) {
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const stream = new StringStream(program);
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const parser = new PostScriptParser(new PostScriptLexer(stream));
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return parser.parse();
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}
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it("parses empty programs", function () {
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const output = parse("{}");
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expect(output.length).toEqual(0);
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});
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it("parses positive numbers", function () {
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const number = 999;
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const program = parse("{ " + number + " }");
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const expectedProgram = [number];
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expect(program).toEqual(expectedProgram);
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});
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it("parses negative numbers", function () {
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const number = -999;
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const program = parse("{ " + number + " }");
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const expectedProgram = [number];
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expect(program).toEqual(expectedProgram);
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});
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it("parses negative floats", function () {
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const number = 3.3;
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const program = parse("{ " + number + " }");
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const expectedProgram = [number];
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expect(program).toEqual(expectedProgram);
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});
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it("parses operators", function () {
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const program = parse("{ sub }");
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const expectedProgram = ["sub"];
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expect(program).toEqual(expectedProgram);
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});
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it("parses if statements", function () {
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const program = parse("{ { 99 } if }");
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const expectedProgram = [3, "jz", 99];
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expect(program).toEqual(expectedProgram);
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});
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it("parses ifelse statements", function () {
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const program = parse("{ { 99 } { 44 } ifelse }");
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const expectedProgram = [5, "jz", 99, 6, "j", 44];
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expect(program).toEqual(expectedProgram);
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});
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it("handles missing brackets", function () {
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expect(function () {
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parse("{");
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}).toThrow(new Error("Unexpected symbol: found undefined expected 1."));
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});
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it("handles junk after the end", function () {
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const number = 3.3;
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const program = parse("{ " + number + " }#");
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const expectedProgram = [number];
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expect(program).toEqual(expectedProgram);
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});
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});
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describe("PostScriptEvaluator", function () {
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function evaluate(program) {
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const stream = new StringStream(program);
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const parser = new PostScriptParser(new PostScriptLexer(stream));
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const code = parser.parse();
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const evaluator = new PostScriptEvaluator(code);
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const output = evaluator.execute();
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return output;
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}
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it("pushes stack", function () {
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const stack = evaluate("{ 99 }");
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const expectedStack = [99];
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expect(stack).toEqual(expectedStack);
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});
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it("handles if with true", function () {
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const stack = evaluate("{ 1 {99} if }");
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const expectedStack = [99];
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expect(stack).toEqual(expectedStack);
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});
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it("handles if with false", function () {
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const stack = evaluate("{ 0 {99} if }");
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const expectedStack = [];
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expect(stack).toEqual(expectedStack);
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});
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it("handles ifelse with true", function () {
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const stack = evaluate("{ 1 {99} {77} ifelse }");
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const expectedStack = [99];
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expect(stack).toEqual(expectedStack);
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});
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it("handles ifelse with false", function () {
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const stack = evaluate("{ 0 {99} {77} ifelse }");
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const expectedStack = [77];
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expect(stack).toEqual(expectedStack);
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});
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it("handles nested if", function () {
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const stack = evaluate("{ 1 {1 {77} if} if }");
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const expectedStack = [77];
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expect(stack).toEqual(expectedStack);
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});
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it("abs", function () {
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const stack = evaluate("{ -2 abs }");
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const expectedStack = [2];
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expect(stack).toEqual(expectedStack);
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});
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it("adds", function () {
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const stack = evaluate("{ 1 2 add }");
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const expectedStack = [3];
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expect(stack).toEqual(expectedStack);
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});
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it("boolean and", function () {
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const stack = evaluate("{ true false and }");
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const expectedStack = [false];
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expect(stack).toEqual(expectedStack);
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});
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it("bitwise and", function () {
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const stack = evaluate("{ 254 1 and }");
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const expectedStack = [254 & 1];
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expect(stack).toEqual(expectedStack);
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});
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it("the angle in degrees (0-360) whose tangent is num/den.", function () {
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const stack = evaluate("{ 1 -1 atan }");
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const expectedStack = [135];
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expect(stack).toEqual(expectedStack);
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});
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it("handles bitshifting ", function () {
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const stack = evaluate("{ 50 2 bitshift }");
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const expectedStack = [200];
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expect(stack).toEqual(expectedStack);
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});
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it("calculates the ceiling value", function () {
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const stack = evaluate("{ 9.9 ceiling }");
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const expectedStack = [10];
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expect(stack).toEqual(expectedStack);
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});
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it("copies", function () {
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const stack = evaluate("{ 99 98 2 copy }");
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const expectedStack = [99, 98, 99, 98];
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expect(stack).toEqual(expectedStack);
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});
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it("calculates the cosine of an angle in degrees", function () {
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const stack = evaluate("{ 180 cos }");
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const expectedStack = [-1];
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expect(stack).toEqual(expectedStack);
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});
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it("converts to int", function () {
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const stack = evaluate("{ 9.9 cvi }");
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const expectedStack = [9];
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expect(stack).toEqual(expectedStack);
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});
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it("converts negatives to int", function () {
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const stack = evaluate("{ -9.9 cvi }");
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const expectedStack = [-9];
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expect(stack).toEqual(expectedStack);
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});
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it("converts to real", function () {
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const stack = evaluate("{ 55.34 cvr }");
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const expectedStack = [55.34];
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expect(stack).toEqual(expectedStack);
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});
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it("divides", function () {
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const stack = evaluate("{ 6 5 div }");
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const expectedStack = [1.2];
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expect(stack).toEqual(expectedStack);
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});
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it("maps division by zero to infinity", function () {
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const stack = evaluate("{ 6 0 div }");
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const expectedStack = [Infinity];
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expect(stack).toEqual(expectedStack);
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});
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it("duplicates", function () {
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const stack = evaluate("{ 99 dup }");
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const expectedStack = [99, 99];
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expect(stack).toEqual(expectedStack);
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});
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it("accepts an equality", function () {
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const stack = evaluate("{ 9 9 eq }");
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const expectedStack = [true];
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expect(stack).toEqual(expectedStack);
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});
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it("rejects an inequality", function () {
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const stack = evaluate("{ 9 8 eq }");
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const expectedStack = [false];
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expect(stack).toEqual(expectedStack);
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});
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it("exchanges", function () {
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const stack = evaluate("{ 44 99 exch }");
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const expectedStack = [99, 44];
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expect(stack).toEqual(expectedStack);
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});
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it("handles exponentiation", function () {
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const stack = evaluate("{ 10 2 exp }");
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const expectedStack = [100];
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expect(stack).toEqual(expectedStack);
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});
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it("pushes false onto the stack", function () {
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const stack = evaluate("{ false }");
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const expectedStack = [false];
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expect(stack).toEqual(expectedStack);
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});
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it("calculates the floor value", function () {
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const stack = evaluate("{ 9.9 floor }");
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const expectedStack = [9];
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expect(stack).toEqual(expectedStack);
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});
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it("handles greater than or equal to", function () {
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const stack = evaluate("{ 10 9 ge }");
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const expectedStack = [true];
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expect(stack).toEqual(expectedStack);
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});
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it("rejects less than for greater than or equal to", function () {
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const stack = evaluate("{ 8 9 ge }");
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const expectedStack = [false];
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expect(stack).toEqual(expectedStack);
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});
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it("handles greater than", function () {
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const stack = evaluate("{ 10 9 gt }");
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const expectedStack = [true];
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expect(stack).toEqual(expectedStack);
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});
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it("rejects less than or equal for greater than", function () {
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const stack = evaluate("{ 9 9 gt }");
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const expectedStack = [false];
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expect(stack).toEqual(expectedStack);
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});
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it("divides to integer", function () {
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const stack = evaluate("{ 2 3 idiv }");
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const expectedStack = [0];
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expect(stack).toEqual(expectedStack);
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});
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it("divides to negative integer", function () {
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const stack = evaluate("{ -2 3 idiv }");
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const expectedStack = [0];
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expect(stack).toEqual(expectedStack);
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});
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it("duplicates index", function () {
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const stack = evaluate("{ 4 3 2 1 2 index }");
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const expectedStack = [4, 3, 2, 1, 3];
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expect(stack).toEqual(expectedStack);
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});
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it("handles less than or equal to", function () {
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const stack = evaluate("{ 9 10 le }");
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const expectedStack = [true];
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expect(stack).toEqual(expectedStack);
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});
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it("rejects greater than for less than or equal to", function () {
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const stack = evaluate("{ 10 9 le }");
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const expectedStack = [false];
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expect(stack).toEqual(expectedStack);
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});
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it("calculates the natural logarithm", function () {
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const stack = evaluate("{ 10 ln }");
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const expectedStack = [Math.log(10)];
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expect(stack).toEqual(expectedStack);
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});
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it("calculates the base 10 logarithm", function () {
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const stack = evaluate("{ 100 log }");
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const expectedStack = [2];
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expect(stack).toEqual(expectedStack);
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});
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it("handles less than", function () {
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const stack = evaluate("{ 9 10 lt }");
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const expectedStack = [true];
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expect(stack).toEqual(expectedStack);
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});
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it("rejects greater than or equal to for less than", function () {
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const stack = evaluate("{ 10 9 lt }");
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const expectedStack = [false];
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expect(stack).toEqual(expectedStack);
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});
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it("performs the modulo operation", function () {
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const stack = evaluate("{ 4 3 mod }");
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const expectedStack = [1];
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expect(stack).toEqual(expectedStack);
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});
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it("multiplies two numbers (positive result)", function () {
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const stack = evaluate("{ 9 8 mul }");
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const expectedStack = [72];
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expect(stack).toEqual(expectedStack);
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});
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it("multiplies two numbers (negative result)", function () {
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const stack = evaluate("{ 9 -8 mul }");
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const expectedStack = [-72];
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expect(stack).toEqual(expectedStack);
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});
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it("accepts an inequality", function () {
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const stack = evaluate("{ 9 8 ne }");
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const expectedStack = [true];
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expect(stack).toEqual(expectedStack);
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});
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it("rejects an equality", function () {
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const stack = evaluate("{ 9 9 ne }");
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const expectedStack = [false];
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expect(stack).toEqual(expectedStack);
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});
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it("negates", function () {
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const stack = evaluate("{ 4.5 neg }");
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const expectedStack = [-4.5];
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expect(stack).toEqual(expectedStack);
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});
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it("boolean not", function () {
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const stack = evaluate("{ true not }");
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const expectedStack = [false];
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expect(stack).toEqual(expectedStack);
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});
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it("bitwise not", function () {
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const stack = evaluate("{ 12 not }");
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const expectedStack = [-13];
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expect(stack).toEqual(expectedStack);
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});
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it("boolean or", function () {
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const stack = evaluate("{ true false or }");
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const expectedStack = [true];
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expect(stack).toEqual(expectedStack);
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});
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it("bitwise or", function () {
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const stack = evaluate("{ 254 1 or }");
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const expectedStack = [254 | 1];
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expect(stack).toEqual(expectedStack);
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});
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it("pops stack", function () {
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const stack = evaluate("{ 1 2 pop }");
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const expectedStack = [1];
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expect(stack).toEqual(expectedStack);
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});
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it("rolls stack right", function () {
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const stack = evaluate("{ 1 3 2 2 4 1 roll }");
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const expectedStack = [2, 1, 3, 2];
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expect(stack).toEqual(expectedStack);
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});
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it("rolls stack left", function () {
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const stack = evaluate("{ 1 3 2 2 4 -1 roll }");
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const expectedStack = [3, 2, 2, 1];
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expect(stack).toEqual(expectedStack);
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});
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it("rounds a number", function () {
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const stack = evaluate("{ 9.52 round }");
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const expectedStack = [10];
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expect(stack).toEqual(expectedStack);
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});
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it("calculates the sine of an angle in degrees", function () {
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const stack = evaluate("{ 90 sin }");
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const expectedStack = [1];
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expect(stack).toEqual(expectedStack);
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});
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it("calculates a square root (integer)", function () {
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const stack = evaluate("{ 100 sqrt }");
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const expectedStack = [10];
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expect(stack).toEqual(expectedStack);
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});
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it("calculates a square root (float)", function () {
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const stack = evaluate("{ 99 sqrt }");
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const expectedStack = [Math.sqrt(99)];
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expect(stack).toEqual(expectedStack);
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});
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it("subtracts (positive result)", function () {
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const stack = evaluate("{ 6 4 sub }");
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const expectedStack = [2];
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expect(stack).toEqual(expectedStack);
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});
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it("subtracts (negative result)", function () {
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const stack = evaluate("{ 4 6 sub }");
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const expectedStack = [-2];
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expect(stack).toEqual(expectedStack);
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});
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it("pushes true onto the stack", function () {
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const stack = evaluate("{ true }");
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const expectedStack = [true];
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expect(stack).toEqual(expectedStack);
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});
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it("truncates a number", function () {
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const stack = evaluate("{ 35.004 truncate }");
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const expectedStack = [35];
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expect(stack).toEqual(expectedStack);
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});
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it("calculates an exclusive or value", function () {
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const stack = evaluate("{ 3 9 xor }");
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const expectedStack = [10];
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expect(stack).toEqual(expectedStack);
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});
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});
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describe("PostScriptCompiler", function () {
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function check(code, domain, range, samples) {
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const compiler = new PostScriptCompiler();
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const compiledCode = compiler.compile(code, domain, range);
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if (samples === null) {
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expect(compiledCode).toBeNull();
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} else {
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expect(compiledCode).not.toBeNull();
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// eslint-disable-next-line no-new-func
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const fn = new Function(
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"src",
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"srcOffset",
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"dest",
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"destOffset",
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compiledCode
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);
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for (const { input, output } of samples) {
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const out = new Float32Array(output.length);
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fn(input, 0, out, 0);
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expect(Array.from(out)).toEqual(output);
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}
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}
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}
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it("check compiled add", function () {
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check([0.25, 0.5, "add"], [], [0, 1], [{ input: [], output: [0.75] }]);
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check([0, "add"], [0, 1], [0, 1], [{ input: [0.25], output: [0.25] }]);
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check([0.5, "add"], [0, 1], [0, 1], [{ input: [0.25], output: [0.75] }]);
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check(
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[0, "exch", "add"],
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[0, 1],
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[0, 1],
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[{ input: [0.25], output: [0.25] }]
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);
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check(
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[0.5, "exch", "add"],
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[0, 1],
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[0, 1],
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[{ input: [0.25], output: [0.75] }]
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);
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check(
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["add"],
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[0, 1, 0, 1],
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[0, 1],
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[{ input: [0.25, 0.5], output: [0.75] }]
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);
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check(["add"], [0, 1], [0, 1], null);
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});
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it("check compiled sub", function () {
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check([0.5, 0.25, "sub"], [], [0, 1], [{ input: [], output: [0.25] }]);
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check([0, "sub"], [0, 1], [0, 1], [{ input: [0.25], output: [0.25] }]);
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check([0.5, "sub"], [0, 1], [0, 1], [{ input: [0.75], output: [0.25] }]);
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|
check(
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[0, "exch", "sub"],
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[0, 1],
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|
[-1, 1],
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[{ input: [0.25], output: [-0.25] }]
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);
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check(
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[0.75, "exch", "sub"],
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[0, 1],
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[-1, 1],
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[{ input: [0.25], output: [0.5] }]
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);
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check(
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["sub"],
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[0, 1, 0, 1],
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[-1, 1],
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[{ input: [0.25, 0.5], output: [-0.25] }]
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);
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check(["sub"], [0, 1], [0, 1], null);
|
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|
check(
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[1, "dup", 3, 2, "roll", "sub", "sub"],
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[0, 1],
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[0, 1],
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[{ input: [0.75], output: [0.75] }]
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);
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});
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it("check compiled mul", function () {
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check([0.25, 0.5, "mul"], [], [0, 1], [{ input: [], output: [0.125] }]);
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check([0, "mul"], [0, 1], [0, 1], [{ input: [0.25], output: [0] }]);
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check([0.5, "mul"], [0, 1], [0, 1], [{ input: [0.25], output: [0.125] }]);
|
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check([1, "mul"], [0, 1], [0, 1], [{ input: [0.25], output: [0.25] }]);
|
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check(
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[0, "exch", "mul"],
|
|
[0, 1],
|
|
[0, 1],
|
|
[{ input: [0.25], output: [0] }]
|
|
);
|
|
check(
|
|
[0.5, "exch", "mul"],
|
|
[0, 1],
|
|
[0, 1],
|
|
[{ input: [0.25], output: [0.125] }]
|
|
);
|
|
check(
|
|
[1, "exch", "mul"],
|
|
[0, 1],
|
|
[0, 1],
|
|
[{ input: [0.25], output: [0.25] }]
|
|
);
|
|
check(
|
|
["mul"],
|
|
[0, 1, 0, 1],
|
|
[0, 1],
|
|
[{ input: [0.25, 0.5], output: [0.125] }]
|
|
);
|
|
check(["mul"], [0, 1], [0, 1], null);
|
|
});
|
|
it("check compiled max", function () {
|
|
check(
|
|
["dup", 0.75, "gt", 7, "jz", "pop", 0.75],
|
|
[0, 1],
|
|
[0, 1],
|
|
[{ input: [0.5], output: [0.5] }]
|
|
);
|
|
check(
|
|
["dup", 0.75, "gt", 7, "jz", "pop", 0.75],
|
|
[0, 1],
|
|
[0, 1],
|
|
[{ input: [1], output: [0.75] }]
|
|
);
|
|
check(["dup", 0.75, "gt", 5, "jz", "pop", 0.75], [0, 1], [0, 1], null);
|
|
});
|
|
it("check pop/roll/index", function () {
|
|
check([1, "pop"], [0, 1], [0, 1], [{ input: [0.5], output: [0.5] }]);
|
|
check(
|
|
[1, 3, -1, "roll"],
|
|
[0, 1, 0, 1],
|
|
[0, 1, 0, 1, 0, 1],
|
|
[{ input: [0.25, 0.5], output: [0.5, 1, 0.25] }]
|
|
);
|
|
check(
|
|
[1, 3, 1, "roll"],
|
|
[0, 1, 0, 1],
|
|
[0, 1, 0, 1, 0, 1],
|
|
[{ input: [0.25, 0.5], output: [1, 0.25, 0.5] }]
|
|
);
|
|
check([1, 3, 1.5, "roll"], [0, 1, 0, 1], [0, 1, 0, 1, 0, 1], null);
|
|
check(
|
|
[1, 1, "index"],
|
|
[0, 1],
|
|
[0, 1, 0, 1, 0, 1],
|
|
[{ input: [0.5], output: [0.5, 1, 0.5] }]
|
|
);
|
|
check([1, 3, "index", "pop"], [0, 1], [0, 1], null);
|
|
check([1, 0.5, "index", "pop"], [0, 1], [0, 1], null);
|
|
});
|
|
it("check input boundaries", function () {
|
|
check([], [0, 0.5], [0, 1], [{ input: [1], output: [0.5] }]);
|
|
check([], [0.5, 1], [0, 1], [{ input: [0], output: [0.5] }]);
|
|
check(
|
|
["dup"],
|
|
[0.5, 0.75],
|
|
[0, 1, 0, 1],
|
|
[{ input: [0], output: [0.5, 0.5] }]
|
|
);
|
|
check([], [100, 1001], [0, 10000], [{ input: [1000], output: [1000] }]);
|
|
});
|
|
it("check output boundaries", function () {
|
|
check([], [0, 1], [0, 0.5], [{ input: [1], output: [0.5] }]);
|
|
check([], [0, 1], [0.5, 1], [{ input: [0], output: [0.5] }]);
|
|
check(
|
|
["dup"],
|
|
[0, 1],
|
|
[0.5, 1, 0.75, 1],
|
|
[{ input: [0], output: [0.5, 0.75] }]
|
|
);
|
|
check([], [0, 10000], [100, 1001], [{ input: [1000], output: [1000] }]);
|
|
});
|
|
it("compile optimized", function () {
|
|
const compiler = new PostScriptCompiler();
|
|
const code = [0, "add", 1, 1, 3, -1, "roll", "sub", "sub", 1, "mul"];
|
|
const compiledCode = compiler.compile(code, [0, 1], [0, 1]);
|
|
expect(compiledCode).toEqual(
|
|
"dest[destOffset + 0] = Math.max(0, Math.min(1, src[srcOffset + 0]));"
|
|
);
|
|
});
|
|
});
|
|
});
|