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srcset.ts — vue Source File

Architecture documentation for srcset.ts, a typescript file in the vue codebase. 5 imports, 1 dependents.

File typescript CompilerSFC StyleProcessor 5 imports 1 dependents 1 functions

Entity Profile

Dependency Diagram

graph LR
  b079557f_1b35_1202_e466_a7574ca75db9["srcset.ts"]
  2347b93b_5b26_2b27_6743_fe5fed353eb5["utils.ts"]
  b079557f_1b35_1202_e466_a7574ca75db9 --> 2347b93b_5b26_2b27_6743_fe5fed353eb5
  084fbb63_6e20_b1c4_c59e_540beed57a4e["urlToRequire"]
  b079557f_1b35_1202_e466_a7574ca75db9 --> 084fbb63_6e20_b1c4_c59e_540beed57a4e
  dcc849a8_8698_9d99_84f0_b76bdf69610c["assetUrl.ts"]
  b079557f_1b35_1202_e466_a7574ca75db9 --> dcc849a8_8698_9d99_84f0_b76bdf69610c
  0220941a_2501_c188_2847_00cf7829329c["TransformAssetUrlsOptions"]
  b079557f_1b35_1202_e466_a7574ca75db9 --> 0220941a_2501_c188_2847_00cf7829329c
  47ae9f26_59d1_fab2_349f_966f5d15495a["compiler"]
  b079557f_1b35_1202_e466_a7574ca75db9 --> 47ae9f26_59d1_fab2_349f_966f5d15495a
  ff52d56b_a346_9a70_961a_c5aca0690626["compileTemplate.ts"]
  ff52d56b_a346_9a70_961a_c5aca0690626 --> b079557f_1b35_1202_e466_a7574ca75db9
  style b079557f_1b35_1202_e466_a7574ca75db9 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

// vue compiler module for transforming `img:srcset` to a number of `require`s

import { urlToRequire } from './utils'
import { TransformAssetUrlsOptions } from './assetUrl'
import { ASTNode } from 'types/compiler'

interface ImageCandidate {
  require: string
  descriptor: string
}

export default (transformAssetUrlsOptions?: TransformAssetUrlsOptions) => ({
  postTransformNode: (node: ASTNode) => {
    transform(node, transformAssetUrlsOptions)
  }
})

// http://w3c.github.io/html/semantics-embedded-content.html#ref-for-image-candidate-string-5
const escapedSpaceCharacters = /( |\\t|\\n|\\f|\\r)+/g

function transform(
  node: ASTNode,
  transformAssetUrlsOptions?: TransformAssetUrlsOptions
) {
  if (node.type !== 1 || !node.attrs) {
    return
  }

  if (node.tag === 'img' || node.tag === 'source') {
    node.attrs.forEach(attr => {
      if (attr.name === 'srcset') {
        // same logic as in transform-require.js
        const value = attr.value
        const isStatic =
          value.charAt(0) === '"' && value.charAt(value.length - 1) === '"'
        if (!isStatic) {
          return
        }

        const imageCandidates: ImageCandidate[] = value
          .slice(1, -1)
          .split(',')
          .map(s => {
            // The attribute value arrives here with all whitespace, except
            // normal spaces, represented by escape sequences
            const [url, descriptor] = s
              .replace(escapedSpaceCharacters, ' ')
              .trim()
              .split(' ', 2)
            return {
              require: urlToRequire(url, transformAssetUrlsOptions),
              descriptor
            }
          })

        // "require(url1)"
        // "require(url1) 1x"
        // "require(url1), require(url2)"
        // "require(url1), require(url2) 2x"
        // "require(url1) 1x, require(url2)"
        // "require(url1) 1x, require(url2) 2x"
        const code = imageCandidates
          .map(
            ({ require, descriptor }) =>
              `${require} + "${descriptor ? ' ' + descriptor : ''}, " + `
          )
          .join('')
          .slice(0, -6)
          .concat('"')
          .replace(/ \+ ""$/, '')

        attr.value = code
      }
    })
  }
}

Domain

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Functions

Types

Dependencies

Imported By

Source

Frequently Asked Questions

What does srcset.ts do?
srcset.ts is a source file in the vue codebase, written in typescript. It belongs to the CompilerSFC domain, StyleProcessor subdomain.
What functions are defined in srcset.ts?
srcset.ts defines 1 function(s): transform.
What does srcset.ts depend on?
srcset.ts imports 5 module(s): TransformAssetUrlsOptions, assetUrl.ts, compiler, urlToRequire, utils.ts.
What files import srcset.ts?
srcset.ts is imported by 1 file(s): compileTemplate.ts.
Where is srcset.ts in the architecture?
srcset.ts is located at packages/compiler-sfc/src/templateCompilerModules/srcset.ts (domain: CompilerSFC, subdomain: StyleProcessor, directory: packages/compiler-sfc/src/templateCompilerModules).

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