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syntax.js
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syntax.js
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module.exports = create
var matters = require('./matters')
function create(options) {
var settings = matters(options)
var length = settings.length
var index = -1
var flow = {}
var matter
var code
while (++index < length) {
matter = settings[index]
code = fence(matter, 'open').charCodeAt(0)
if (code in flow) {
flow[code].push(parse(matter))
} else {
flow[code] = [parse(matter)]
}
}
return {flow: flow}
}
function parse(matter) {
var name = matter.type
var anywhere = matter.anywhere
var valueType = name + 'Value'
var fenceType = name + 'Fence'
var sequenceType = fenceType + 'Sequence'
var fenceConstruct = {tokenize: tokenizeFence, partial: true}
var buffer
return {tokenize: tokenizeFrontmatter, concrete: true}
function tokenizeFrontmatter(effects, ok, nok) {
var self = this
return start
function start(code) {
var position = self.now()
if (position.column !== 1 || (!anywhere && position.line !== 1)) {
return nok(code)
}
effects.enter(name)
buffer = fence(matter, 'open')
return effects.attempt(fenceConstruct, afterOpeningFence, nok)(code)
}
function afterOpeningFence(code) {
buffer = fence(matter, 'close')
return lineEnd(code)
}
function lineStart(code) {
if (code === -5 || code === -4 || code === -3 || code === null) {
return lineEnd(code)
}
effects.enter(valueType)
return lineData(code)
}
function lineData(code) {
if (code === -5 || code === -4 || code === -3 || code === null) {
effects.exit(valueType)
return lineEnd(code)
}
effects.consume(code)
return lineData
}
function lineEnd(code) {
// Require a closing fence.
if (code === null) {
return nok(code)
}
// Can only be an eol.
effects.enter('lineEnding')
effects.consume(code)
effects.exit('lineEnding')
return effects.attempt(fenceConstruct, after, lineStart)
}
function after(code) {
effects.exit(name)
return ok(code)
}
}
function tokenizeFence(effects, ok, nok) {
var bufferIndex = 0
return start
function start(code) {
if (code === buffer.charCodeAt(bufferIndex)) {
effects.enter(fenceType)
effects.enter(sequenceType)
return insideSequence(code)
}
return nok(code)
}
function insideSequence(code) {
if (bufferIndex === buffer.length) {
effects.exit(sequenceType)
if (code === -2 || code === -1 || code === 32) {
effects.enter('whitespace')
return insideWhitespace(code)
}
return fenceEnd(code)
}
if (code === buffer.charCodeAt(bufferIndex)) {
effects.consume(code)
bufferIndex++
return insideSequence
}
return nok(code)
}
function insideWhitespace(code) {
if (code === -2 || code === -1 || code === 32) {
effects.consume(code)
return insideWhitespace
}
effects.exit('whitespace')
return fenceEnd(code)
}
function fenceEnd(code) {
if (code === -5 || code === -4 || code === -3 || code === null) {
effects.exit(fenceType)
return ok(code)
}
return nok(code)
}
}
}
function fence(matter, prop) {
var marker
if (matter.marker) {
marker = pick(matter.marker, prop)
return marker + marker + marker
}
return pick(matter.fence, prop)
}
function pick(schema, prop) {
return typeof schema === 'string' ? schema : schema[prop]
}