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node_modules/vega-runtime/build/vega-runtime.js

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+(function (global, factory) {
+  typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports, require('vega-util'), require('vega-dataflow')) :
+  typeof define === 'function' && define.amd ? define(['exports', 'vega-util', 'vega-dataflow'], factory) :
+  (global = global || self, factory(global.vega = {}, global.vega, global.vega));
+}(this, (function (exports, vegaUtil, vegaDataflow) { 'use strict';
+
+  /**
+   * Parse a serialized dataflow specification.
+   */
+  function parse(spec) {
+    const ctx = this,
+          operators = spec.operators || [];
+
+    // parse background
+    if (spec.background) {
+      ctx.background = spec.background;
+    }
+
+    // parse event configuration
+    if (spec.eventConfig) {
+      ctx.eventConfig = spec.eventConfig;
+    }
+
+    // parse locale configuration
+    if (spec.locale) {
+      ctx.locale = spec.locale;
+    }
+
+    // parse operators
+    operators.forEach(entry => ctx.parseOperator(entry));
+
+    // parse operator parameters
+    operators.forEach(entry => ctx.parseOperatorParameters(entry));
+
+    // parse streams
+    (spec.streams || []).forEach(entry => ctx.parseStream(entry));
+
+    // parse updates
+    (spec.updates || []).forEach(entry => ctx.parseUpdate(entry));
+
+    return ctx.resolve();
+  }
+
+  const Skip = vegaUtil.toSet(['rule']),
+        Swap = vegaUtil.toSet(['group', 'image', 'rect']);
+
+  function adjustSpatial(encode, marktype) {
+    let code = '';
+
+    if (Skip[marktype]) return code;
+
+    if (encode.x2) {
+      if (encode.x) {
+        if (Swap[marktype]) {
+          code += 'if(o.x>o.x2)$=o.x,o.x=o.x2,o.x2=$;';
+        }
+        code += 'o.width=o.x2-o.x;';
+      } else {
+        code += 'o.x=o.x2-(o.width||0);';
+      }
+    }
+
+    if (encode.xc) {
+      code += 'o.x=o.xc-(o.width||0)/2;';
+    }
+
+    if (encode.y2) {
+      if (encode.y) {
+        if (Swap[marktype]) {
+          code += 'if(o.y>o.y2)$=o.y,o.y=o.y2,o.y2=$;';
+        }
+        code += 'o.height=o.y2-o.y;';
+      } else {
+        code += 'o.y=o.y2-(o.height||0);';
+      }
+    }
+
+    if (encode.yc) {
+      code += 'o.y=o.yc-(o.height||0)/2;';
+    }
+
+    return code;
+  }
+
+  function canonicalType(type) {
+    return (type + '').toLowerCase();
+  }
+
+  function isOperator(type) {
+     return canonicalType(type) === 'operator';
+  }
+
+  function isCollect(type) {
+    return canonicalType(type) === 'collect';
+  }
+
+  function expression(ctx, args, code) {
+    // wrap code in return statement if expression does not terminate
+    if (code[code.length-1] !== ';') {
+      code = 'return(' + code + ');';
+    }
+    var fn = Function.apply(null, args.concat(code));
+    return ctx && ctx.functions ? fn.bind(ctx.functions) : fn;
+  }
+
+  // generate code for comparing a single field
+  function _compare(u, v, lt, gt) {
+    return `((u = ${u}) < (v = ${v}) || u == null) && v != null ? ${lt}
+  : (u > v || v == null) && u != null ? ${gt}
+  : ((v = v instanceof Date ? +v : v), (u = u instanceof Date ? +u : u)) !== u && v === v ? ${lt}
+  : v !== v && u === u ? ${gt} : `;
+  }
+
+  var expressionCodegen = {
+    /**
+     * Parse an expression used to update an operator value.
+     */
+    operator: (ctx, expr) => expression(ctx, ['_'], expr.code),
+
+    /**
+     * Parse an expression provided as an operator parameter value.
+     */
+    parameter: (ctx, expr) => expression(ctx, ['datum', '_'], expr.code),
+
+    /**
+     * Parse an expression applied to an event stream.
+     */
+    event: (ctx, expr) => expression(ctx, ['event'], expr.code),
+
+    /**
+     * Parse an expression used to handle an event-driven operator update.
+     */
+    handler: (ctx, expr) => {
+      const code = `var datum=event.item&&event.item.datum;return ${expr.code};`;
+      return expression(ctx, ['_', 'event'], code);
+    },
+
+    /**
+     * Parse an expression that performs visual encoding.
+     */
+    encode: (ctx, encode) => {
+      const {marktype, channels} = encode;
+
+      let code = 'var o=item,datum=o.datum,m=0,$;';
+      for (const name in channels) {
+        const o ='o[' + vegaUtil.stringValue(name) + ']';
+        code += `$=${channels[name].code};if(${o}!==$)${o}=$,m=1;`;
+      }
+      code += adjustSpatial(channels, marktype);
+      code += 'return m;';
+
+      return expression(ctx, ['item', '_'], code);
+    },
+
+    /**
+     * Optimized code generators for access and comparison.
+     */
+    codegen: {
+      get(path) {
+        const ref = `[${path.map(vegaUtil.stringValue).join('][')}]`;
+        const get = Function('_', `return _${ref};`);
+        get.path = ref;
+        return get;
+      },
+      comparator(fields, orders) {
+        let t;
+        const map = (f, i) => {
+          const o = orders[i];
+          let u, v;
+          if (f.path) {
+            u = `a${f.path}`;
+            v = `b${f.path}`;
+          } else {
+            (t = t || {})['f'+i] = f;
+            u = `this.f${i}(a)`;
+            v = `this.f${i}(b)`;
+          }
+          return _compare(u, v, -o, o);
+        };
+
+        const fn = Function('a', 'b', 'var u, v; return '
+          + fields.map(map).join('') + '0;');
+        return t ? fn.bind(t) : fn;
+      }
+    }
+  };
+
+  /**
+   * Parse a dataflow operator.
+   */
+  function parseOperator(spec) {
+    const ctx = this;
+    if (isOperator(spec.type) || !spec.type) {
+      ctx.operator(
+        spec,
+        spec.update ? ctx.operatorExpression(spec.update) : null
+      );
+    } else {
+      ctx.transform(spec, spec.type);
+    }
+  }
+
+  /**
+   * Parse and assign operator parameters.
+   */
+  function parseOperatorParameters(spec) {
+    const ctx = this;
+    if (spec.params) {
+      const op = ctx.get(spec.id);
+      if (!op) vegaUtil.error('Invalid operator id: ' + spec.id);
+      ctx.dataflow.connect(op, op.parameters(
+        ctx.parseParameters(spec.params),
+        spec.react,
+        spec.initonly
+      ));
+    }
+  }
+
+  /**
+   * Parse a set of operator parameters.
+   */
+  function parseParameters(spec, params) {
+    params = params || {};
+    const ctx = this;
+
+    for (const key in spec) {
+      const value = spec[key];
+      params[key] = vegaUtil.isArray(value)
+        ? value.map(v => parseParameter(v, ctx, params))
+        : parseParameter(value, ctx, params);
+    }
+
+    return params;
+  }
+
+  /**
+   * Parse a single parameter.
+   */
+  function parseParameter(spec, ctx, params) {
+    if (!spec || !vegaUtil.isObject(spec)) return spec;
+
+    for (let i=0, n=PARSERS.length, p; i<n; ++i) {
+      p = PARSERS[i];
+      if (vegaUtil.hasOwnProperty(spec, p.key)) {
+        return p.parse(spec, ctx, params);
+      }
+    }
+
+    return spec;
+  }
+
+  /** Reference parsers. */
+  var PARSERS = [
+    {key: '$ref',      parse: getOperator},
+    {key: '$key',      parse: getKey},
+    {key: '$expr',     parse: getExpression},
+    {key: '$field',    parse: getField},
+    {key: '$encode',   parse: getEncode},
+    {key: '$compare',  parse: getCompare},
+    {key: '$context',  parse: getContext},
+    {key: '$subflow',  parse: getSubflow},
+    {key: '$tupleid',  parse: getTupleId}
+  ];
+
+  /**
+   * Resolve an operator reference.
+   */
+  function getOperator(_, ctx) {
+    return ctx.get(_.$ref) || vegaUtil.error('Operator not defined: ' + _.$ref);
+  }
+
+  /**
+   * Resolve an expression reference.
+   */
+  function getExpression(_, ctx, params) {
+    if (_.$params) { // parse expression parameters
+      ctx.parseParameters(_.$params, params);
+    }
+    const k = 'e:' + _.$expr.code + '_' + _.$name;
+    return ctx.fn[k] || (ctx.fn[k] = vegaUtil.accessor(
+      ctx.parameterExpression(_.$expr),
+      _.$fields,
+      _.$name
+    ));
+  }
+
+  /**
+   * Resolve a key accessor reference.
+   */
+  function getKey(_, ctx) {
+    const k = 'k:' + _.$key + '_' + (!!_.$flat);
+    return ctx.fn[k] || (ctx.fn[k] = vegaUtil.key(_.$key, _.$flat, ctx.expr.codegen));
+  }
+
+  /**
+   * Resolve a field accessor reference.
+   */
+  function getField(_, ctx) {
+    if (!_.$field) return null;
+    const k = 'f:' + _.$field + '_' + _.$name;
+    return ctx.fn[k] || (ctx.fn[k] = vegaUtil.field(_.$field, _.$name, ctx.expr.codegen));
+  }
+
+  /**
+   * Resolve a comparator function reference.
+   */
+  function getCompare(_, ctx) {
+    // As of Vega 5.5.3, $tupleid sort is no longer used.
+    // Keep here for now for backwards compatibility.
+    const k = 'c:' + _.$compare + '_' + _.$order,
+          c = vegaUtil.array(_.$compare).map(_ => (_ && _.$tupleid) ? vegaDataflow.tupleid : _);
+    return ctx.fn[k] || (ctx.fn[k] = vegaUtil.compare(c, _.$order, ctx.expr.codegen));
+  }
+
+  /**
+   * Resolve an encode operator reference.
+   */
+  function getEncode(_, ctx) {
+    const spec = _.$encode,
+          encode = {};
+
+    for (const name in spec) {
+      const enc = spec[name];
+      encode[name] = vegaUtil.accessor(ctx.encodeExpression(enc.$expr), enc.$fields);
+      encode[name].output = enc.$output;
+    }
+    return encode;
+  }
+
+  /**
+   * Resolve a context reference.
+   */
+  function getContext(_, ctx) {
+    return ctx;
+  }
+
+  /**
+   * Resolve a recursive subflow specification.
+   */
+  function getSubflow(_, ctx) {
+    const spec = _.$subflow;
+    return function(dataflow, key, parent) {
+      const subctx = ctx.fork().parse(spec),
+            op = subctx.get(spec.operators[0].id),
+            p = subctx.signals.parent;
+      if (p) p.set(parent);
+      op.detachSubflow = () => ctx.detach(subctx);
+      return op;
+    };
+  }
+
+  /**
+   * Resolve a tuple id reference.
+   */
+  function getTupleId() {
+    return vegaDataflow.tupleid;
+  }
+
+  /**
+   * Parse an event stream specification.
+   */
+  function parseStream(spec) {
+    var ctx = this,
+        filter = spec.filter != null ? ctx.eventExpression(spec.filter) : undefined,
+        stream = spec.stream != null ? ctx.get(spec.stream) : undefined,
+        args;
+
+    if (spec.source) {
+      stream = ctx.events(spec.source, spec.type, filter);
+    }
+    else if (spec.merge) {
+      args = spec.merge.map(_ => ctx.get(_));
+      stream = args[0].merge.apply(args[0], args.slice(1));
+    }
+
+    if (spec.between) {
+      args = spec.between.map(_ => ctx.get(_));
+      stream = stream.between(args[0], args[1]);
+    }
+
+    if (spec.filter) {
+      stream = stream.filter(filter);
+    }
+
+    if (spec.throttle != null) {
+      stream = stream.throttle(+spec.throttle);
+    }
+
+    if (spec.debounce != null) {
+      stream = stream.debounce(+spec.debounce);
+    }
+
+    if (stream == null) {
+      vegaUtil.error('Invalid stream definition: ' + JSON.stringify(spec));
+    }
+
+    if (spec.consume) stream.consume(true);
+
+    ctx.stream(spec, stream);
+  }
+
+  /**
+   * Parse an event-driven operator update.
+   */
+  function parseUpdate(spec) {
+    var ctx = this,
+        srcid = vegaUtil.isObject(srcid = spec.source) ? srcid.$ref : srcid,
+        source = ctx.get(srcid),
+        target = null,
+        update = spec.update,
+        params = undefined;
+
+    if (!source) vegaUtil.error('Source not defined: ' + spec.source);
+
+    target = spec.target && spec.target.$expr
+      ? ctx.eventExpression(spec.target.$expr)
+      : ctx.get(spec.target);
+
+    if (update && update.$expr) {
+      if (update.$params) {
+        params = ctx.parseParameters(update.$params);
+      }
+      update = ctx.handlerExpression(update.$expr);
+    }
+
+    ctx.update(spec, source, target, update, params);
+  }
+
+  var SKIP = {skip: true};
+
+  function getState(options) {
+    var ctx = this,
+        state = {};
+
+    if (options.signals) {
+      var signals = (state.signals = {});
+      Object.keys(ctx.signals).forEach(key => {
+        var op = ctx.signals[key];
+        if (options.signals(key, op)) {
+          signals[key] = op.value;
+        }
+      });
+    }
+
+    if (options.data) {
+      var data = (state.data = {});
+      Object.keys(ctx.data).forEach(key => {
+        var dataset = ctx.data[key];
+        if (options.data(key, dataset)) {
+          data[key] = dataset.input.value;
+        }
+      });
+    }
+
+    if (ctx.subcontext && options.recurse !== false) {
+      state.subcontext = ctx.subcontext.map(ctx => ctx.getState(options));
+    }
+
+    return state;
+  }
+
+  function setState(state) {
+    var ctx = this,
+        df = ctx.dataflow,
+        data = state.data,
+        signals = state.signals;
+
+    Object.keys(signals || {}).forEach(key => {
+      df.update(ctx.signals[key], signals[key], SKIP);
+    });
+
+    Object.keys(data || {}).forEach(key => {
+      df.pulse(
+        ctx.data[key].input,
+        df.changeset().remove(vegaUtil.truthy).insert(data[key])
+      );
+    });
+
+    (state.subcontext  || []).forEach((substate, i) => {
+      var subctx = ctx.subcontext[i];
+      if (subctx) subctx.setState(substate);
+    });
+  }
+
+  /**
+   * Context objects store the current parse state.
+   * Enables lookup of parsed operators, event streams, accessors, etc.
+   * Provides a 'fork' method for creating child contexts for subflows.
+   */
+  function context(df, transforms, functions, expr) {
+    return new Context(df, transforms, functions, expr);
+  }
+
+  function Context(df, transforms, functions, expr) {
+    this.dataflow = df;
+    this.transforms = transforms;
+    this.events = df.events.bind(df);
+    this.expr = expr || expressionCodegen,
+    this.signals = {};
+    this.scales = {};
+    this.nodes = {};
+    this.data = {};
+    this.fn = {};
+    if (functions) {
+      this.functions = Object.create(functions);
+      this.functions.context = this;
+    }
+  }
+
+  function Subcontext(ctx) {
+    this.dataflow = ctx.dataflow;
+    this.transforms = ctx.transforms;
+    this.events = ctx.events;
+    this.expr = ctx.expr;
+    this.signals = Object.create(ctx.signals);
+    this.scales = Object.create(ctx.scales);
+    this.nodes = Object.create(ctx.nodes);
+    this.data = Object.create(ctx.data);
+    this.fn = Object.create(ctx.fn);
+    if (ctx.functions) {
+      this.functions = Object.create(ctx.functions);
+      this.functions.context = this;
+    }
+  }
+
+  Context.prototype = Subcontext.prototype = {
+    fork() {
+      const ctx = new Subcontext(this);
+      (this.subcontext || (this.subcontext = [])).push(ctx);
+      return ctx;
+    },
+    detach(ctx) {
+      this.subcontext = this.subcontext.filter(c => c !== ctx);
+
+      // disconnect all nodes in the subcontext
+      // wipe out targets first for better efficiency
+      const keys = Object.keys(ctx.nodes);
+      for (const key of keys) ctx.nodes[key]._targets = null;
+      for (const key of keys) ctx.nodes[key].detach();
+      ctx.nodes = null;
+    },
+    get(id) {
+      return this.nodes[id];
+    },
+    set(id, node) {
+      return this.nodes[id] = node;
+    },
+    add(spec, op) {
+      const ctx = this,
+            df = ctx.dataflow,
+            data = spec.value;
+
+      ctx.set(spec.id, op);
+
+      if (isCollect(spec.type) && data) {
+        if (data.$ingest) {
+          df.ingest(op, data.$ingest, data.$format);
+        } else if (data.$request) {
+          df.preload(op, data.$request, data.$format);
+        } else {
+          df.pulse(op, df.changeset().insert(data));
+        }
+      }
+
+      if (spec.root) {
+        ctx.root = op;
+      }
+
+      if (spec.parent) {
+        var p = ctx.get(spec.parent.$ref);
+        if (p) {
+          df.connect(p, [op]);
+          op.targets().add(p);
+        } else {
+          (ctx.unresolved = ctx.unresolved || []).push(() => {
+            p = ctx.get(spec.parent.$ref);
+            df.connect(p, [op]);
+            op.targets().add(p);
+          });
+        }
+      }
+
+      if (spec.signal) {
+        ctx.signals[spec.signal] = op;
+      }
+
+      if (spec.scale) {
+        ctx.scales[spec.scale] = op;
+      }
+
+      if (spec.data) {
+        for (const name in spec.data) {
+          const data = ctx.data[name] || (ctx.data[name] = {});
+          spec.data[name].forEach(role => data[role] = op);
+        }
+      }
+    },
+    resolve() {
+      (this.unresolved || []).forEach(fn => fn());
+      delete this.unresolved;
+      return this;
+    },
+    operator(spec, update) {
+      this.add(spec, this.dataflow.add(spec.value, update));
+    },
+    transform(spec, type) {
+      this.add(spec, this.dataflow.add(this.transforms[canonicalType(type)]));
+    },
+    stream(spec, stream) {
+      this.set(spec.id, stream);
+    },
+    update(spec, stream, target, update, params) {
+      this.dataflow.on(stream, target, update, params, spec.options);
+    },
+
+    // expression parsing
+    operatorExpression(expr) {
+      return this.expr.operator(this, expr);
+    },
+    parameterExpression(expr) {
+      return this.expr.parameter(this, expr);
+    },
+    eventExpression(expr) {
+      return this.expr.event(this, expr);
+    },
+    handlerExpression(expr) {
+      return this.expr.handler(this, expr);
+    },
+    encodeExpression(encode) {
+      return this.expr.encode(this, encode);
+    },
+
+    // parse methods
+    parse,
+    parseOperator,
+    parseOperatorParameters,
+    parseParameters,
+    parseStream,
+    parseUpdate,
+
+    // state methods
+    getState,
+    setState
+  };
+
+  exports.context = context;
+
+  Object.defineProperty(exports, '__esModule', { value: true });
+
+})));