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Add a parser to get font data from the default appearance
- pdfium & poppler use a special parser too to get these info.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,161 @@ | ||
| /* Copyright 2020 Mozilla Foundation | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
|
||
| import { isName, Name } from "./primitives.js"; | ||
| import { escapePDFName } from "./core_utils.js"; | ||
|
|
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| // Parse DA to extract font and color informations | ||
| function parseDefaultAppearance(str) { | ||
| const result = { | ||
| fontSize: null, | ||
| fontName: null, | ||
| color: null, | ||
| }; | ||
|
|
||
| if (!str) { | ||
| return result; | ||
| } | ||
|
|
||
| const stack = []; | ||
|
|
||
| for (const token of str.split(/\s+/)) { | ||
| if (!token) { | ||
| continue; | ||
| } | ||
| switch (token.charAt(0)) { | ||
| case "/": | ||
| // we've a name | ||
| const name = token | ||
| .slice(1) | ||
| .replace(/#([0-9a-fA-F]{2})/, (match, n) => | ||
| String.fromCharCode(n.parseInt(16)) | ||
| ); | ||
| stack.push(Name.get(name)); | ||
| break; | ||
| case "-": | ||
| case "0": | ||
| case "1": | ||
| case "2": | ||
| case "3": | ||
| case "4": | ||
| case "5": | ||
| case "6": | ||
| case "7": | ||
| case "8": | ||
| case "9": | ||
| case ".": | ||
| // we've a number | ||
| stack.push(Number.parseFloat(token)); | ||
| break; | ||
| case "T": | ||
| if (token !== "Tf") { | ||
| break; | ||
| } | ||
| // font op | ||
| // two last elements in stack must be a Name and number | ||
| if (stack.length < 2) { | ||
| break; | ||
| } | ||
| const fontSize = stack.pop(); | ||
| const fontName = stack.pop(); | ||
|
|
||
| if (typeof fontSize !== "number") { | ||
| break; | ||
| } | ||
| if (!isName(fontName)) { | ||
| break; | ||
| } | ||
| result.fontSize = fontSize; | ||
| result.fontName = fontName; | ||
| break; | ||
| case "g": | ||
| // gray op | ||
| if (stack.length < 1) { | ||
| break; | ||
| } | ||
| const gray = stack.pop(); | ||
| if (typeof gray !== "number") { | ||
| break; | ||
| } | ||
| result.color = [gray]; | ||
| break; | ||
| case "r": | ||
| if (token !== "rg") { | ||
| break; | ||
| } | ||
| // rgb op | ||
| if (stack.length < 3) { | ||
| break; | ||
| } | ||
| const r = stack.pop(); | ||
| const g = stack.pop(); | ||
| const b = stack.pop(); | ||
| if ( | ||
| typeof r !== "number" || | ||
| typeof g !== "number" || | ||
| typeof b !== "number" | ||
| ) { | ||
| break; | ||
| } | ||
| result.color = [r, g, b]; | ||
| break; | ||
| case "k": | ||
| // cmyk op | ||
| const c = stack.pop(); | ||
| const m = stack.pop(); | ||
| const y = stack.pop(); | ||
| const k = stack.pop(); | ||
| if ( | ||
| typeof c !== "number" || | ||
| typeof m !== "number" || | ||
| typeof y !== "number" || | ||
| typeof k !== "number" | ||
| ) { | ||
| break; | ||
| } | ||
| result.color = [c, m, y, k]; | ||
| break; | ||
| } | ||
| } | ||
|
|
||
| return result; | ||
| } | ||
|
|
||
| function dumpDefaultAppearance(fontSize, fontName, color) { | ||
| fontSize = fontSize || 0; | ||
| fontName = isName(fontName) ? fontName.name : fontName; | ||
|
|
||
| if (color) { | ||
| let colorCmd = ""; | ||
| switch (color.length) { | ||
| case 1: | ||
| colorCmd = "g"; | ||
| break; | ||
| case 2: | ||
| colorCmd = "rg"; | ||
| break; | ||
| case 4: | ||
| colorCmd = "k"; | ||
| break; | ||
| } | ||
| color = ` ${color.join(" ")} ${colorCmd}`; | ||
| } else { | ||
| color = ""; | ||
| } | ||
|
|
||
| return `/${escapePDFName(fontName)} ${fontSize} Tf${color}`; | ||
| } | ||
|
|
||
| export { dumpDefaultAppearance, parseDefaultAppearance }; |
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