Add support for numerical font weights (#181)

Co-authored-by: Lukas Hollaender <lukas.hollaender@yworks.com>

package.json

@@ -69,7 +69,7 @@
     "cssesc": "^3.0.0",
     "exorcist": "^1.0.1",
     "font-family-papandreou": "^0.2.0-patch1",
-    "jspdf": "^2.2.0",
+    "jspdf": "^2.4.0",
     "karma": "^6.3.2",
     "karma-chai": "^0.1.0",
     "karma-chrome-launcher": "^3.1.0",

src/applyparseattributes.ts

@@ -4,7 +4,11 @@ import { toPixels } from './utils/misc'
 import { parseColor, parseFloats } from './utils/parsing'
 import FontFamily from 'font-family-papandreou'
 import { SvgNode } from './nodes/svgnode'
-import { findFirstAvailableFontFamily, fontAliases } from './utils/fonts'
+import {
+  combineFontStyleAndFontWeight,
+  findFirstAvailableFontFamily,
+  fontAliases
+} from './utils/fonts'
 import { parseFill } from './fill/parseFill'
 import { ColorFill } from './fill/ColorFill'
 import { GState } from 'jspdf'
@@ -277,17 +281,10 @@ export function applyAttributes(
     childContext.attributeState.fontWeight !== parentContext.attributeState.fontWeight ||
     childContext.attributeState.fontStyle !== parentContext.attributeState.fontStyle
   ) {
-    fontStyle = ''
-    if (childContext.attributeState.fontWeight === 'bold') {
-      fontStyle = 'bold'
-    }
-    if (childContext.attributeState.fontStyle === 'italic') {
-      fontStyle += 'italic'
-    }
-
-    if (fontStyle === '') {
-      fontStyle = 'normal'
-    }
+    fontStyle = combineFontStyleAndFontWeight(
+      childContext.attributeState.fontStyle,
+      childContext.attributeState.fontWeight
+    )
   }
 
   if (font !== undefined || fontStyle !== undefined) {

src/utils/fonts.ts

@@ -5,6 +5,7 @@
  */
 import { AttributeState } from '../context/attributestate'
 import { Context } from '../context/context'
+import jsPDF from 'jspdf'
 
 export type FontFamily = string
 
@@ -27,16 +28,10 @@ export function findFirstAvailableFontFamily(
   fontFamilies: FontFamily[],
   context: Context
 ): FontFamily {
-  let fontType = ''
-  if (attributeState.fontWeight === 'bold') {
-    fontType = 'bold'
-  }
-  if (attributeState.fontStyle === 'italic') {
-    fontType += 'italic'
-  }
-  if (fontType === '') {
-    fontType = 'normal'
-  }
+  const fontType = combineFontStyleAndFontWeight(
+    attributeState.fontStyle,
+    attributeState.fontWeight
+  )
 
   const availableFonts = context.pdf.getFontList()
   let firstAvailable = ''
@@ -62,3 +57,31 @@ export function findFirstAvailableFontFamily(
 
   return firstAvailable
 }
+
+const isJsPDF23: boolean = (() => {
+  const parts = jsPDF.version.split('.')
+  return parseFloat(parts[0]) === 2 && parseFloat(parts[1]) === 3
+})()
+
+export function combineFontStyleAndFontWeight(
+  fontStyle: string,
+  fontWeight: number | string
+): string {
+  if (isJsPDF23) {
+    return fontWeight == 400
+      ? fontStyle == 'italic'
+        ? 'italic'
+        : 'normal'
+      : fontWeight == 700 && fontStyle !== 'italic'
+      ? 'bold'
+      : fontStyle + '' + fontWeight
+  } else {
+    return fontWeight == 400 || fontWeight === 'normal'
+      ? fontStyle === 'italic'
+        ? 'italic'
+        : 'normal'
+      : (fontWeight == 700 || fontWeight === 'bold') && fontStyle === 'normal'
+      ? 'bold'
+      : (fontWeight == 700 ? 'bold' : fontWeight) + '' + fontStyle
+  }
+}

yarn.lock

@@ -23,6 +23,13 @@
     chalk "^2.0.0"
     js-tokens "^4.0.0"
 
+"@babel/runtime@^7.14.0":
+  version "7.15.4"
+  resolved "https://registry.yarnpkg.com/@babel/runtime/-/runtime-7.15.4.tgz#fd17d16bfdf878e6dd02d19753a39fa8a8d9c84a"
+  integrity sha512-99catp6bHCaxr4sJ/DbTGgHS4+Rs2RVd2g7iOap6SLGPDknRK9ztKNsE/Fg6QhSeh1FGE5f6gHGQmvvn3I3xhw==
+  dependencies:
+    regenerator-runtime "^0.13.4"
+
 "@babel/runtime@^7.6.3":
   version "7.11.2"
   resolved "https://registry.yarnpkg.com/@babel/runtime/-/runtime-7.11.2.tgz#f549c13c754cc40b87644b9fa9f09a6a95fe0736"
@@ -2495,11 +2502,12 @@ jsonfile@^4.0.0:
   optionalDependencies:
     graceful-fs "^4.1.6"
 
-jspdf@^2.2.0:
-  version "2.3.1"
-  resolved "https://registry.yarnpkg.com/jspdf/-/jspdf-2.3.1.tgz#313d117234b546469694a1fd81a1e02411647576"
-  integrity sha512-1vp0USP1mQi1h7NKpwxjFgQkJ5ncZvtH858aLpycUc/M+r/RpWJT8PixAU7Cw/3fPd4fpC8eB/Bj42LnsR21YQ==
+jspdf@^2.4.0:
+  version "2.4.0"
+  resolved "https://registry.yarnpkg.com/jspdf/-/jspdf-2.4.0.tgz#53d6d2acc63203b0b3688949597dd11a633b1db5"
+  integrity sha512-nsZ92YfbNG/EimR1yqmOkxf2D4iJRypBsw7pvP1aPiIEnoGITaLl6XDR/GYA36/R29vMZSBedpEhBCzutSGytA==
   dependencies:
+    "@babel/runtime" "^7.14.0"
     atob "^2.1.2"
     btoa "^1.2.1"
     fflate "^0.4.8"