mirror of
https://github.com/flynx/pWiki.git
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559 lines
16 KiB
JavaScript
Executable File
559 lines
16 KiB
JavaScript
Executable File
/**********************************************************************
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*
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*
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*
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**********************************************************************/
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((typeof define)[0]=='u'?function(f){module.exports=f(require)}:define)
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(function(require){ var module={} // make module AMD/node compatible...
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/*********************************************************************/
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var types = require('ig-types')
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//---------------------------------------------------------------------
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// Parser...
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// XXX should we warn about stuff like <macro src=/moo/> -- currently
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// this will simply be ignored, i.e. passed trough the parser
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// without change...
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// XXX might be a good idea to both think of a good async parse and
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// create tools for sync parsing (get links etc.)...
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var BaseParser =
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module.BaseParser = {
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// patterns...
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//
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// The way the patterns are organized might seem a bit overcomplicated
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// and it has to be to be able to reuse the same pattern in different
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// contexts, e.g. the arguments pattern...
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//
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// needs:
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// STOP -- '\\>' or ')'
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// PREFIX -- 'inline' or 'elem'
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//
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MACRO_ARGS: ['(\\s*(',[
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// arg='val' | arg="val" | arg=val
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'(?<PREFIXArgName>[a-z-]+)\\s*=\\s*(?<PREFIXArgValue>'+([
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// XXX CHROME/NODE BUG: this does not work yet...
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//'\\s+(?<quote>[\'"])[^\\k<quote>]*\\k<quote>',
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'"(?<PREFIXDoubleQuotedValue>(\\"|[^"])*?)"',
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"'(?<PREFIXSingleQuotedValue>(\\'|[^'])*?)'",
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'(?<PREFIXValue>[^\\sSTOP\'"]+)',
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].join('|'))+')',
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// "arg" | 'arg'
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// XXX CHROME/NODE BUG: this does not work yet...
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//'\\s+(?<quote>[\'"])[^\\k<quote>]*\\k<quote>',
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'"(?<PREFIXDoubleQuotedArg>(\\"|[^"])*?)"',
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"'(?<PREFIXSingleQuotedArg>(\\'|[^'])*?)'",
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// arg
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// NOTE: this is last because it could eat up parts of
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// the above alternatives...
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//'|\\s+[^\\s\\/>\'"]+',
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'(?<PREFIXArg>[^\\sSTOP\'"]+)',
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].join('|'),
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'))'].join(''),
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MACRO_ARGS_PATTERN: undefined,
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//
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// .buildArgsPattern(<prefix>[, <stop>[, <flags>]])
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// -> <pattern>
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//
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// .buildArgsPattern(<prefix>[, <stop>[, false]])
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// -> <string>
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//
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buildArgsPattern: function(prefix='elem', stop='', regexp='smig'){
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var pattern = this.MACRO_ARGS
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.replace(/PREFIX/g, prefix)
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.replace(/STOP/g, stop)
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return regexp ?
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new RegExp(pattern, regexp)
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: pattern },
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//
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// needs:
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// MACROS
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// INLINE_ARGS
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// UNNAMED_ARGS
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// ARGS
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//
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MACRO: '('+([
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// @macro(arg ..)
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'\\\\?@(?<nameInline>MACROS)\\((?<argsInline>INLINE_ARGS)\\)',
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// @(arg ..)
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'\\\\?@\\((?<argsUnnamed>UNNAMED_ARGS)\\)',
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// <macro ..> | <macro ../>
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'<\\s*(?<nameOpen>MACROS)(?<argsOpen>\\sARGS)?\\s*/?>',
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// </macro>
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'</\\s*(?<nameClose>MACROS)\\s*>',
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].join('|'))+')',
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MACRO_PATTERN: undefined,
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MACRO_PATTERN_GROUPS: undefined,
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//
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// .buildMacroPattern(<macros>[, <flags>])
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// -> <pattern>
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//
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// .buildMacroPattern(<macros>[, false])
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// -> <string>
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//
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buildMacroPattern: function(macros=['MACROS'], regexp='smig'){
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var pattern = this.MACRO
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.replace(/MACROS/g,
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macros
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.filter(function(m){
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return m.length > 0 })
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.join('|'))
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.replace(/INLINE_ARGS/g,
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this.buildArgsPattern('inline', ')', false) +'*')
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.replace(/UNNAMED_ARGS/g,
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this.buildArgsPattern('unnamed', ')', false) +'*')
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.replace(/ARGS/g,
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this.buildArgsPattern('elem', '\\/>', false) +'*')
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return regexp ?
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new RegExp(pattern, regexp)
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: pattern },
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countMacroPatternGroups: function(){
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// NOTE: the -2 here is to compensate for the leading and trailing ""'s...
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return '<MACROS>'.split(this.buildMacroPattern()).length - 2 },
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// XXX should this be closer to .stripComments(..)
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// XXX do we need basic inline and block commets a-la lisp???
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COMMENT_PATTERN: RegExp('('+[
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// <!--[pwiki[ .. ]]-->
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'<!--\\[pwiki\\[(?<uncomment>.*?)\\]\\]-->',
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// <pwiki-comment> .. </pwiki-comment>
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'<\\s*pwiki-comment[^>]*>.*?<\\/\\s*pwiki-comment\\s*>',
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// <pwiki-comment .. />
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'<\\s*pwiki-comment[^\\/>]*\\/>',
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// html comments...
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'<!--.*?-->',
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].join('|') +')', 'smig'),
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// helpers...
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//
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normalizeFilters: function(filters){
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var skip = new Set()
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return filters
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.flat()
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.tailUnique()
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.filter(function(filter){
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filter[0] == '-'
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&& skip.add(filter.slice(1))
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return filter[0] != '-' })
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.filter(function(filter){
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return !skip.has(filter) })},
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//
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// Spec format:
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// [<orderd>, ... [<keyword>, ...]]
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//
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// NOTE: the input to this is formatted by .lex(..)
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// NOTE: arg pre-parsing is dome by .lex(..) but at that stage we do not
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// yet touch the actual macros (we need them to get the .arg_spec)
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// so the actual parsing is done in .expand(..)
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parseArgs: function(spec, args){
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// spec...
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var order = spec.slice()
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var bools = new Set(
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order[order.length-1] instanceof Array ?
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order.pop()
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: [])
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order = order
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.filter(function(k){
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return !(k in args) })
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var res = {}
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var pos = Object.entries(args)
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// stage 1: populate res with explicit data and place the rest in pos...
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.reduce(function(pos, [key, value]){
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;/^[0-9]+$/.test(key) ?
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(bools.has(value) ?
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// bool...
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(res[value] = true)
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// positional...
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: (pos[key*1] = value))
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// keyword...
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: (res[key] = value)
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return pos }, [])
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// stage 2: populate implicit values from pos...
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.forEach(function(e, i){
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order.length == 0 ?
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(res[e] = true)
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: (res[order.shift()] = e) })
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return res },
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// XXX should this be here or on page???
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callMacro: function(page, name, args, body, state, ...rest){
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return page.macros[name].call(page,
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this.parseArgs(
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page.macros[name].arg_spec
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?? [],
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args),
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body,
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state,
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...rest) },
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// Strip comments...
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//
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stripComments: function(str){
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return str
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.replace(this.COMMENT_PATTERN,
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function(...a){
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return a.pop().uncomment
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|| '' }) },
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// Lexically split the string...
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//
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// <item> ::=
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// <string>
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// | {
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// name: <string>,
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// type: 'inline'
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// | 'element'
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// | 'opening'
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// | 'closing',
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// args: {
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// <index>: <value>,
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// <key>: <value>,
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// ...
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// }
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// match: <string>,
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// }
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//
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//
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// NOTE: this internally uses page.macros' keys to generate the
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// lexing pattern.
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lex: function*(page, str){
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str = typeof(str) != 'string' ?
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str+''
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: str
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// XXX we can't get .raw from the page without going async...
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//str = str
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// ?? page.raw
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// NOTE: we are doing a separate pass for comments to completely
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// decouple them from the base macro syntax, making them fully
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// transparent...
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str = this.stripComments(str)
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// XXX should this be cached???
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var macro_pattern = this.MACRO_PATTERN
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?? this.buildMacroPattern(Object.keys(page.macros))
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var macro_pattern_groups = this.MACRO_PATTERN_GROUPS
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?? this.countMacroPatternGroups()
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var macro_args_pattern = this.MACRO_ARGS_PATTERN
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?? this.buildArgsPattern()
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var lst = str.split(macro_pattern)
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var macro = false
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while(lst.length > 0){
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if(macro){
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var match = lst.splice(0, macro_pattern_groups)[0]
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// NOTE: we essentially are parsing the detected macro a
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// second time here, this gives us access to named groups
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// avoiding maintaining match indexes with the .split(..)
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// output...
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// XXX for some reason .match(..) here returns a list with a string...
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var cur = [...match.matchAll(macro_pattern)][0].groups
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// special case: escaped inline macro -> keep as text...
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if(match.startsWith('\\@')){
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yield match
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macro = false
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continue }
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// args...
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var args = {}
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var i = -1
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for(var {groups}
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of (cur.argsInline
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?? cur.argsUnnamed
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?? cur.argsOpen
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?? '')
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.matchAll(macro_args_pattern)){
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i++
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args[groups.elemArgName
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?? groups.inlineArgName
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?? groups.unnamedArgName
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?? i] =
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(groups.elemSingleQuotedValue
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?? groups.inlineSingleQuotedValue
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?? groups.unnamedSingleQuotedValue
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?? groups.elemDoubleQuotedValue
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?? groups.inlineDoubleQuotedValue
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?? groups.unnamedDoubleQuotedValue
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?? groups.elemValue
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?? groups.inlineValue
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?? groups.unnamedValue
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?? groups.elemSingleQuotedArg
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?? groups.inlineSingleQuotedArg
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?? groups.unnamedSingleQuotedArg
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?? groups.elemDoubleQuotedArg
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?? groups.inlineDoubleQuotedArg
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?? groups.unnamedDoubleQuotedArg
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?? groups.elemArg
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?? groups.inlineArg
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?? groups.unnamedArg)
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.replace(/\\(["'])/g, '$1') }
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// macro-spec...
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yield {
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name: (cur.nameInline
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?? cur.nameOpen
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?? cur.nameClose
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?? '')
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.toLowerCase(),
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type: match[0] == '@' ?
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'inline'
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: match[1] == '/' ?
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'closing'
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: match[match.length-2] == '/' ?
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'element'
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: 'opening',
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args,
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match,
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}
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macro = false
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// normal text...
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} else {
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var str = lst.shift()
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// skip empty strings from output...
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if(str != ''){
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yield str }
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macro = true } } },
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// Group block elements...
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//
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// <item> ::=
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// <string>
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// | {
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// type: 'inline'
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// | 'element'
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// | 'block',
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// body: [
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// <item>,
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// ...
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// ],
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//
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// // rest of items are the same as for lex(..)
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// ...
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// }
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//
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// NOTE: this internaly uses page.macros to check for propper nesting
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//group: function*(page, lex, to=false){
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group: function*(page, lex, to=false, parent){
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// XXX we can't get .raw from the page without going async...
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//lex = lex
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// ?? this.lex(page)
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lex = typeof(lex) != 'object' ?
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this.lex(page, lex)
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: lex
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var quoting = to
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&& (page.QUOTING_MACROS ?? []).includes(to)
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&& []
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// NOTE: we are not using for .. of .. here as it depletes the
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// generator even if the end is not reached...
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while(true){
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var {value, done} = lex.next()
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// check if unclosed blocks remaining...
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if(done){
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if(to){
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throw new Error(
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'Premature end of input: Expected closing "'+ to +'"') }
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return }
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// special case: quoting -> collect text...
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// NOTE: we do not care about nesting here...
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if(quoting !== false){
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if(value.name == to
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&& value.type == 'closing'){
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yield quoting.join('')
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return
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} else {
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quoting.push(
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typeof(value) == 'string' ?
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value
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: value.match ) }
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continue }
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// assert nesting rules...
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// NOTE: we only check for direct nesting...
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// XXX might be a good idea to link nested block to the parent...
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if(page.macros[value.name] instanceof Array
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&& !page.macros[value.name].includes(to)
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// do not complain about closing nestable tags...
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&& !(value.name == to
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&& value.type == 'closing')){
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throw new Error(
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'Unexpected "'+ value.name +'" macro'
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+(to ?
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' in "'+to+'"'
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: '')) }
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// open block...
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if(value.type == 'opening'){
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//value.body = [...this.group(page, lex, value.name)]
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value.body = [...this.group(page, lex, value.name, value)]
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value.type = 'block'
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// close block...
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} else if(value.type == 'closing'){
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if(value.name != to){
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throw new Error('Unexpected closing "'+ value.name +'"') }
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// NOTE: we are intentionally not yielding the value here...
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return }
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// normal value...
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yield value } },
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// Expand macros...
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//
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// <ast> ::= [ <item>, .. ]
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// <item> ::=
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// <func>
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// | <promise>
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// | <string>
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// | { skip: true, ... }
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// | { data: <ast> }
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// | <ast>
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//
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// XXX macros: we are mixing up ast state and parse state...
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// one should only be used for parsing and be forgotten after
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// the ast is constructed the other should be part of the ast...
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expand: async function*(page, ast, state={}){
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ast = ast == null ?
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//this.group(page)
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this.group(page, await page.raw ?? '')
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: typeof(ast) != 'object' ?
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this.group(page, ast)
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: ast instanceof types.Generator ?
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ast
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: ast.iter()
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while(true){
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var {value, done} = ast.next()
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if(done){
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return }
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// text block...
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if(typeof(value) == 'string'){
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yield value
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continue }
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// macro...
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var {name, args, body} = value
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// nested macro -- skip...
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if(typeof(page.macros[name]) != 'function'){
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yield {...value, skip: true}
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continue }
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var res =
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await this.callMacro(page, name, args, body, state)
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?? ''
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// result...
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if(res instanceof Array
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|| page.macros[name] instanceof types.Generator){
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yield* res
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} else {
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yield res } } },
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// recursively resolve and enumerate the ast...
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//
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// <ast> ::= [ <item>, .. ]
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// <item> ::=
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// <string>
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// | { data: <ast> }
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//
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// XXX should this also resolve e.data???
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resolve: async function*(page, ast, state={}){
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ast = ast
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?? this.expand(page, null, state)
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ast = typeof(ast) != 'object' ?
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this.expand(page, ast, state)
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: ast
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// NOTE: we need to await for ast here as we need stage 2 of
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// parsing to happen AFTER everything else completes...
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/* XXX GENERATOR -- this breaks the parser...
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// ...investigate the data flow...
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for await (var e of ast){
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/*/
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for(var e of await ast){
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//*/
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// expand delayed sections...
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e = typeof(e) == 'function' ?
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e.call(page, state)
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: e
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// expand arrays...
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if(e instanceof Array
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| e instanceof types.Generator){
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yield* this.resolve(page, e, state)
|
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// data -- unwrap content...
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} else if(e instanceof Object && 'data' in e){
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yield { data: await this.resolve(page, e.data, state) }
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// skipped items...
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} else if(e instanceof Object && e.skip){
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continue
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} else {
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yield e } } },
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// Fully parse a page...
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//
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// This runs in two stages:
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// - resolve the page
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// - lex the page -- .lex(..)
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// - group block elements -- .group(..)
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// - expand macros -- .expand(..)
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// - resolve ast -- .resolve(..)
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// - apply filters
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//
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// NOTE: this has to synchronize everything between stage 1 (up to
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// and including expand) and stage 2 (post-handlers, filters, ...)
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// because the former need a fully loaded and expanded page if
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// we want to do this in 2 stages and not 3...
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// XXX might be fun to try a load-and-tweak approach the first
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// version used -- i.e. setting placeholders and replacing
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// them on demand rather than on encounter (as is now), e.g.
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// a slot when loaded will replace the prior occurrences...
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//
|
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// XXX add a special filter to clear pending filters... (???)
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parse: async function(page, ast, state={}){
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var that = this
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return await this.resolve(page, ast, state)
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// filters...
|
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.map(function(section){
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return (
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// expand section...
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typeof(section) != 'string' ?
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section.data
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// global filters...
|
|
: state.filters ?
|
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that.normalizeFilters(state.filters)
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.reduce(function(res, filter){
|
|
// unknown filter...
|
|
// NOTE: we try not to break on user errors
|
|
// if we can help it...
|
|
if(page.filters[filter] == null){
|
|
console.warn(
|
|
'.parse(..): unsupported filter: '+ filter)
|
|
return res }
|
|
// NOTE: if a filter returns falsy then it
|
|
// will have no effect on the result...
|
|
return page.filters[filter].call(page, res)
|
|
?? res }, section)
|
|
// no global filters...
|
|
: section ) })
|
|
.flat()
|
|
.join('') },
|
|
}
|
|
|
|
var parser =
|
|
module.parser = {
|
|
__proto__: BaseParser,
|
|
}
|
|
|
|
|
|
|
|
/**********************************************************************
|
|
* vim:set ts=4 sw=4 : */ return module })
|